first commit

.gitignore

@@ -0,0 +1,54 @@
+# Prerequisites
+*.d
+
+# Object files
+*.o
+*.ko
+*.obj
+*.elf
+
+# Linker output
+*.ilk
+*.map
+*.exp
+
+# Precompiled Headers
+*.gch
+*.pch
+
+# Libraries
+*.lib
+*.a
+*.la
+*.lo
+
+# Shared objects (inc. Windows DLLs)
+*.dll
+*.so
+*.so.*
+*.dylib
+
+# Executables
+*.exe
+*.out
+*.app
+*.i*86
+*.x86_64
+*.hex
+
+# Debug files
+*.dSYM/
+*.su
+*.idb
+*.pdb
+
+# Kernel Module Compile Results
+*.mod*
+*.cmd
+.tmp_versions/
+modules.order
+Module.symvers
+Mkfile.old
+dkms.conf
+
+build/

.vscode/.server-controller-port.log

@@ -0,0 +1,5 @@
+{
+  "port": 13452,
+  "time": 1728395259887,
+  "version": "0.0.3"
+}

.vscode/settings.json

@@ -0,0 +1,8 @@
+{
+    "C_Cpp.errorSquiggles": "disabled",
+    "files.associations": {
+        "ascii_cmd.h": "c",
+        "time.h": "c",
+        "rds.h": "c"
+    }
+}

LICENSE

@@ -0,0 +1,674 @@
+                    GNU GENERAL PUBLIC LICENSE
+                       Version 3, 29 June 2007
+
+ Copyright (C) 2007 Free Software Foundation, Inc. <https://fsf.org/>
+ Everyone is permitted to copy and distribute verbatim copies
+ of this license document, but changing it is not allowed.
+
+                            Preamble
+
+  The GNU General Public License is a free, copyleft license for
+software and other kinds of works.
+
+  The licenses for most software and other practical works are designed
+to take away your freedom to share and change the works.  By contrast,
+the GNU General Public License is intended to guarantee your freedom to
+share and change all versions of a program--to make sure it remains free
+software for all its users.  We, the Free Software Foundation, use the
+GNU General Public License for most of our software; it applies also to
+any other work released this way by its authors.  You can apply it to
+your programs, too.
+
+  When we speak of free software, we are referring to freedom, not
+price.  Our General Public Licenses are designed to make sure that you
+have the freedom to distribute copies of free software (and charge for
+them if you wish), that you receive source code or can get it if you
+want it, that you can change the software or use pieces of it in new
+free programs, and that you know you can do these things.
+
+  To protect your rights, we need to prevent others from denying you
+these rights or asking you to surrender the rights.  Therefore, you have
+certain responsibilities if you distribute copies of the software, or if
+you modify it: responsibilities to respect the freedom of others.
+
+  For example, if you distribute copies of such a program, whether
+gratis or for a fee, you must pass on to the recipients the same
+freedoms that you received.  You must make sure that they, too, receive
+or can get the source code.  And you must show them these terms so they
+know their rights.
+
+  Developers that use the GNU GPL protect your rights with two steps:
+(1) assert copyright on the software, and (2) offer you this License
+giving you legal permission to copy, distribute and/or modify it.
+
+  For the developers' and authors' protection, the GPL clearly explains
+that there is no warranty for this free software.  For both users' and
+authors' sake, the GPL requires that modified versions be marked as
+changed, so that their problems will not be attributed erroneously to
+authors of previous versions.
+
+  Some devices are designed to deny users access to install or run
+modified versions of the software inside them, although the manufacturer
+can do so.  This is fundamentally incompatible with the aim of
+protecting users' freedom to change the software.  The systematic
+pattern of such abuse occurs in the area of products for individuals to
+use, which is precisely where it is most unacceptable.  Therefore, we
+have designed this version of the GPL to prohibit the practice for those
+products.  If such problems arise substantially in other domains, we
+stand ready to extend this provision to those domains in future versions
+of the GPL, as needed to protect the freedom of users.
+
+  Finally, every program is threatened constantly by software patents.
+States should not allow patents to restrict development and use of
+software on general-purpose computers, but in those that do, we wish to
+avoid the special danger that patents applied to a free program could
+make it effectively proprietary.  To prevent this, the GPL assures that
+patents cannot be used to render the program non-free.
+
+  The precise terms and conditions for copying, distribution and
+modification follow.
+
+                       TERMS AND CONDITIONS
+
+  0. Definitions.
+
+  "This License" refers to version 3 of the GNU General Public License.
+
+  "Copyright" also means copyright-like laws that apply to other kinds of
+works, such as semiconductor masks.
+
+  "The Program" refers to any copyrightable work licensed under this
+License.  Each licensee is addressed as "you".  "Licensees" and
+"recipients" may be individuals or organizations.
+
+  To "modify" a work means to copy from or adapt all or part of the work
+in a fashion requiring copyright permission, other than the making of an
+exact copy.  The resulting work is called a "modified version" of the
+earlier work or a work "based on" the earlier work.
+
+  A "covered work" means either the unmodified Program or a work based
+on the Program.
+
+  To "propagate" a work means to do anything with it that, without
+permission, would make you directly or secondarily liable for
+infringement under applicable copyright law, except executing it on a
+computer or modifying a private copy.  Propagation includes copying,
+distribution (with or without modification), making available to the
+public, and in some countries other activities as well.
+
+  To "convey" a work means any kind of propagation that enables other
+parties to make or receive copies.  Mere interaction with a user through
+a computer network, with no transfer of a copy, is not conveying.
+
+  An interactive user interface displays "Appropriate Legal Notices"
+to the extent that it includes a convenient and prominently visible
+feature that (1) displays an appropriate copyright notice, and (2)
+tells the user that there is no warranty for the work (except to the
+extent that warranties are provided), that licensees may convey the
+work under this License, and how to view a copy of this License.  If
+the interface presents a list of user commands or options, such as a
+menu, a prominent item in the list meets this criterion.
+
+  1. Source Code.
+
+  The "source code" for a work means the preferred form of the work
+for making modifications to it.  "Object code" means any non-source
+form of a work.
+
+  A "Standard Interface" means an interface that either is an official
+standard defined by a recognized standards body, or, in the case of
+interfaces specified for a particular programming language, one that
+is widely used among developers working in that language.
+
+  The "System Libraries" of an executable work include anything, other
+than the work as a whole, that (a) is included in the normal form of
+packaging a Major Component, but which is not part of that Major
+Component, and (b) serves only to enable use of the work with that
+Major Component, or to implement a Standard Interface for which an
+implementation is available to the public in source code form.  A
+"Major Component", in this context, means a major essential component
+(kernel, window system, and so on) of the specific operating system
+(if any) on which the executable work runs, or a compiler used to
+produce the work, or an object code interpreter used to run it.
+
+  The "Corresponding Source" for a work in object code form means all
+the source code needed to generate, install, and (for an executable
+work) run the object code and to modify the work, including scripts to
+control those activities.  However, it does not include the work's
+System Libraries, or general-purpose tools or generally available free
+programs which are used unmodified in performing those activities but
+which are not part of the work.  For example, Corresponding Source
+includes interface definition files associated with source files for
+the work, and the source code for shared libraries and dynamically
+linked subprograms that the work is specifically designed to require,
+such as by intimate data communication or control flow between those
+subprograms and other parts of the work.
+
+  The Corresponding Source need not include anything that users
+can regenerate automatically from other parts of the Corresponding
+Source.
+
+  The Corresponding Source for a work in source code form is that
+same work.
+
+  2. Basic Permissions.
+
+  All rights granted under this License are granted for the term of
+copyright on the Program, and are irrevocable provided the stated
+conditions are met.  This License explicitly affirms your unlimited
+permission to run the unmodified Program.  The output from running a
+covered work is covered by this License only if the output, given its
+content, constitutes a covered work.  This License acknowledges your
+rights of fair use or other equivalent, as provided by copyright law.
+
+  You may make, run and propagate covered works that you do not
+convey, without conditions so long as your license otherwise remains
+in force.  You may convey covered works to others for the sole purpose
+of having them make modifications exclusively for you, or provide you
+with facilities for running those works, provided that you comply with
+the terms of this License in conveying all material for which you do
+not control copyright.  Those thus making or running the covered works
+for you must do so exclusively on your behalf, under your direction
+and control, on terms that prohibit them from making any copies of
+your copyrighted material outside their relationship with you.
+
+  Conveying under any other circumstances is permitted solely under
+the conditions stated below.  Sublicensing is not allowed; section 10
+makes it unnecessary.
+
+  3. Protecting Users' Legal Rights From Anti-Circumvention Law.
+
+  No covered work shall be deemed part of an effective technological
+measure under any applicable law fulfilling obligations under article
+11 of the WIPO copyright treaty adopted on 20 December 1996, or
+similar laws prohibiting or restricting circumvention of such
+measures.
+
+  When you convey a covered work, you waive any legal power to forbid
+circumvention of technological measures to the extent such circumvention
+is effected by exercising rights under this License with respect to
+the covered work, and you disclaim any intention to limit operation or
+modification of the work as a means of enforcing, against the work's
+users, your or third parties' legal rights to forbid circumvention of
+technological measures.
+
+  4. Conveying Verbatim Copies.
+
+  You may convey verbatim copies of the Program's source code as you
+receive it, in any medium, provided that you conspicuously and
+appropriately publish on each copy an appropriate copyright notice;
+keep intact all notices stating that this License and any
+non-permissive terms added in accord with section 7 apply to the code;
+keep intact all notices of the absence of any warranty; and give all
+recipients a copy of this License along with the Program.
+
+  You may charge any price or no price for each copy that you convey,
+and you may offer support or warranty protection for a fee.
+
+  5. Conveying Modified Source Versions.
+
+  You may convey a work based on the Program, or the modifications to
+produce it from the Program, in the form of source code under the
+terms of section 4, provided that you also meet all of these conditions:
+
+    a) The work must carry prominent notices stating that you modified
+    it, and giving a relevant date.
+
+    b) The work must carry prominent notices stating that it is
+    released under this License and any conditions added under section
+    7.  This requirement modifies the requirement in section 4 to
+    "keep intact all notices".
+
+    c) You must license the entire work, as a whole, under this
+    License to anyone who comes into possession of a copy.  This
+    License will therefore apply, along with any applicable section 7
+    additional terms, to the whole of the work, and all its parts,
+    regardless of how they are packaged.  This License gives no
+    permission to license the work in any other way, but it does not
+    invalidate such permission if you have separately received it.
+
+    d) If the work has interactive user interfaces, each must display
+    Appropriate Legal Notices; however, if the Program has interactive
+    interfaces that do not display Appropriate Legal Notices, your
+    work need not make them do so.
+
+  A compilation of a covered work with other separate and independent
+works, which are not by their nature extensions of the covered work,
+and which are not combined with it such as to form a larger program,
+in or on a volume of a storage or distribution medium, is called an
+"aggregate" if the compilation and its resulting copyright are not
+used to limit the access or legal rights of the compilation's users
+beyond what the individual works permit.  Inclusion of a covered work
+in an aggregate does not cause this License to apply to the other
+parts of the aggregate.
+
+  6. Conveying Non-Source Forms.
+
+  You may convey a covered work in object code form under the terms
+of sections 4 and 5, provided that you also convey the
+machine-readable Corresponding Source under the terms of this License,
+in one of these ways:
+
+    a) Convey the object code in, or embodied in, a physical product
+    (including a physical distribution medium), accompanied by the
+    Corresponding Source fixed on a durable physical medium
+    customarily used for software interchange.
+
+    b) Convey the object code in, or embodied in, a physical product
+    (including a physical distribution medium), accompanied by a
+    written offer, valid for at least three years and valid for as
+    long as you offer spare parts or customer support for that product
+    model, to give anyone who possesses the object code either (1) a
+    copy of the Corresponding Source for all the software in the
+    product that is covered by this License, on a durable physical
+    medium customarily used for software interchange, for a price no
+    more than your reasonable cost of physically performing this
+    conveying of source, or (2) access to copy the
+    Corresponding Source from a network server at no charge.
+
+    c) Convey individual copies of the object code with a copy of the
+    written offer to provide the Corresponding Source.  This
+    alternative is allowed only occasionally and noncommercially, and
+    only if you received the object code with such an offer, in accord
+    with subsection 6b.
+
+    d) Convey the object code by offering access from a designated
+    place (gratis or for a charge), and offer equivalent access to the
+    Corresponding Source in the same way through the same place at no
+    further charge.  You need not require recipients to copy the
+    Corresponding Source along with the object code.  If the place to
+    copy the object code is a network server, the Corresponding Source
+    may be on a different server (operated by you or a third party)
+    that supports equivalent copying facilities, provided you maintain
+    clear directions next to the object code saying where to find the
+    Corresponding Source.  Regardless of what server hosts the
+    Corresponding Source, you remain obligated to ensure that it is
+    available for as long as needed to satisfy these requirements.
+
+    e) Convey the object code using peer-to-peer transmission, provided
+    you inform other peers where the object code and Corresponding
+    Source of the work are being offered to the general public at no
+    charge under subsection 6d.
+
+  A separable portion of the object code, whose source code is excluded
+from the Corresponding Source as a System Library, need not be
+included in conveying the object code work.
+
+  A "User Product" is either (1) a "consumer product", which means any
+tangible personal property which is normally used for personal, family,
+or household purposes, or (2) anything designed or sold for incorporation
+into a dwelling.  In determining whether a product is a consumer product,
+doubtful cases shall be resolved in favor of coverage.  For a particular
+product received by a particular user, "normally used" refers to a
+typical or common use of that class of product, regardless of the status
+of the particular user or of the way in which the particular user
+actually uses, or expects or is expected to use, the product.  A product
+is a consumer product regardless of whether the product has substantial
+commercial, industrial or non-consumer uses, unless such uses represent
+the only significant mode of use of the product.
+
+  "Installation Information" for a User Product means any methods,
+procedures, authorization keys, or other information required to install
+and execute modified versions of a covered work in that User Product from
+a modified version of its Corresponding Source.  The information must
+suffice to ensure that the continued functioning of the modified object
+code is in no case prevented or interfered with solely because
+modification has been made.
+
+  If you convey an object code work under this section in, or with, or
+specifically for use in, a User Product, and the conveying occurs as
+part of a transaction in which the right of possession and use of the
+User Product is transferred to the recipient in perpetuity or for a
+fixed term (regardless of how the transaction is characterized), the
+Corresponding Source conveyed under this section must be accompanied
+by the Installation Information.  But this requirement does not apply
+if neither you nor any third party retains the ability to install
+modified object code on the User Product (for example, the work has
+been installed in ROM).
+
+  The requirement to provide Installation Information does not include a
+requirement to continue to provide support service, warranty, or updates
+for a work that has been modified or installed by the recipient, or for
+the User Product in which it has been modified or installed.  Access to a
+network may be denied when the modification itself materially and
+adversely affects the operation of the network or violates the rules and
+protocols for communication across the network.
+
+  Corresponding Source conveyed, and Installation Information provided,
+in accord with this section must be in a format that is publicly
+documented (and with an implementation available to the public in
+source code form), and must require no special password or key for
+unpacking, reading or copying.
+
+  7. Additional Terms.
+
+  "Additional permissions" are terms that supplement the terms of this
+License by making exceptions from one or more of its conditions.
+Additional permissions that are applicable to the entire Program shall
+be treated as though they were included in this License, to the extent
+that they are valid under applicable law.  If additional permissions
+apply only to part of the Program, that part may be used separately
+under those permissions, but the entire Program remains governed by
+this License without regard to the additional permissions.
+
+  When you convey a copy of a covered work, you may at your option
+remove any additional permissions from that copy, or from any part of
+it.  (Additional permissions may be written to require their own
+removal in certain cases when you modify the work.)  You may place
+additional permissions on material, added by you to a covered work,
+for which you have or can give appropriate copyright permission.
+
+  Notwithstanding any other provision of this License, for material you
+add to a covered work, you may (if authorized by the copyright holders of
+that material) supplement the terms of this License with terms:
+
+    a) Disclaiming warranty or limiting liability differently from the
+    terms of sections 15 and 16 of this License; or
+
+    b) Requiring preservation of specified reasonable legal notices or
+    author attributions in that material or in the Appropriate Legal
+    Notices displayed by works containing it; or
+
+    c) Prohibiting misrepresentation of the origin of that material, or
+    requiring that modified versions of such material be marked in
+    reasonable ways as different from the original version; or
+
+    d) Limiting the use for publicity purposes of names of licensors or
+    authors of the material; or
+
+    e) Declining to grant rights under trademark law for use of some
+    trade names, trademarks, or service marks; or
+
+    f) Requiring indemnification of licensors and authors of that
+    material by anyone who conveys the material (or modified versions of
+    it) with contractual assumptions of liability to the recipient, for
+    any liability that these contractual assumptions directly impose on
+    those licensors and authors.
+
+  All other non-permissive additional terms are considered "further
+restrictions" within the meaning of section 10.  If the Program as you
+received it, or any part of it, contains a notice stating that it is
+governed by this License along with a term that is a further
+restriction, you may remove that term.  If a license document contains
+a further restriction but permits relicensing or conveying under this
+License, you may add to a covered work material governed by the terms
+of that license document, provided that the further restriction does
+not survive such relicensing or conveying.
+
+  If you add terms to a covered work in accord with this section, you
+must place, in the relevant source files, a statement of the
+additional terms that apply to those files, or a notice indicating
+where to find the applicable terms.
+
+  Additional terms, permissive or non-permissive, may be stated in the
+form of a separately written license, or stated as exceptions;
+the above requirements apply either way.
+
+  8. Termination.
+
+  You may not propagate or modify a covered work except as expressly
+provided under this License.  Any attempt otherwise to propagate or
+modify it is void, and will automatically terminate your rights under
+this License (including any patent licenses granted under the third
+paragraph of section 11).
+
+  However, if you cease all violation of this License, then your
+license from a particular copyright holder is reinstated (a)
+provisionally, unless and until the copyright holder explicitly and
+finally terminates your license, and (b) permanently, if the copyright
+holder fails to notify you of the violation by some reasonable means
+prior to 60 days after the cessation.
+
+  Moreover, your license from a particular copyright holder is
+reinstated permanently if the copyright holder notifies you of the
+violation by some reasonable means, this is the first time you have
+received notice of violation of this License (for any work) from that
+copyright holder, and you cure the violation prior to 30 days after
+your receipt of the notice.
+
+  Termination of your rights under this section does not terminate the
+licenses of parties who have received copies or rights from you under
+this License.  If your rights have been terminated and not permanently
+reinstated, you do not qualify to receive new licenses for the same
+material under section 10.
+
+  9. Acceptance Not Required for Having Copies.
+
+  You are not required to accept this License in order to receive or
+run a copy of the Program.  Ancillary propagation of a covered work
+occurring solely as a consequence of using peer-to-peer transmission
+to receive a copy likewise does not require acceptance.  However,
+nothing other than this License grants you permission to propagate or
+modify any covered work.  These actions infringe copyright if you do
+not accept this License.  Therefore, by modifying or propagating a
+covered work, you indicate your acceptance of this License to do so.
+
+  10. Automatic Licensing of Downstream Recipients.
+
+  Each time you convey a covered work, the recipient automatically
+receives a license from the original licensors, to run, modify and
+propagate that work, subject to this License.  You are not responsible
+for enforcing compliance by third parties with this License.
+
+  An "entity transaction" is a transaction transferring control of an
+organization, or substantially all assets of one, or subdividing an
+organization, or merging organizations.  If propagation of a covered
+work results from an entity transaction, each party to that
+transaction who receives a copy of the work also receives whatever
+licenses to the work the party's predecessor in interest had or could
+give under the previous paragraph, plus a right to possession of the
+Corresponding Source of the work from the predecessor in interest, if
+the predecessor has it or can get it with reasonable efforts.
+
+  You may not impose any further restrictions on the exercise of the
+rights granted or affirmed under this License.  For example, you may
+not impose a license fee, royalty, or other charge for exercise of
+rights granted under this License, and you may not initiate litigation
+(including a cross-claim or counterclaim in a lawsuit) alleging that
+any patent claim is infringed by making, using, selling, offering for
+sale, or importing the Program or any portion of it.
+
+  11. Patents.
+
+  A "contributor" is a copyright holder who authorizes use under this
+License of the Program or a work on which the Program is based.  The
+work thus licensed is called the contributor's "contributor version".
+
+  A contributor's "essential patent claims" are all patent claims
+owned or controlled by the contributor, whether already acquired or
+hereafter acquired, that would be infringed by some manner, permitted
+by this License, of making, using, or selling its contributor version,
+but do not include claims that would be infringed only as a
+consequence of further modification of the contributor version.  For
+purposes of this definition, "control" includes the right to grant
+patent sublicenses in a manner consistent with the requirements of
+this License.
+
+  Each contributor grants you a non-exclusive, worldwide, royalty-free
+patent license under the contributor's essential patent claims, to
+make, use, sell, offer for sale, import and otherwise run, modify and
+propagate the contents of its contributor version.
+
+  In the following three paragraphs, a "patent license" is any express
+agreement or commitment, however denominated, not to enforce a patent
+(such as an express permission to practice a patent or covenant not to
+sue for patent infringement).  To "grant" such a patent license to a
+party means to make such an agreement or commitment not to enforce a
+patent against the party.
+
+  If you convey a covered work, knowingly relying on a patent license,
+and the Corresponding Source of the work is not available for anyone
+to copy, free of charge and under the terms of this License, through a
+publicly available network server or other readily accessible means,
+then you must either (1) cause the Corresponding Source to be so
+available, or (2) arrange to deprive yourself of the benefit of the
+patent license for this particular work, or (3) arrange, in a manner
+consistent with the requirements of this License, to extend the patent
+license to downstream recipients.  "Knowingly relying" means you have
+actual knowledge that, but for the patent license, your conveying the
+covered work in a country, or your recipient's use of the covered work
+in a country, would infringe one or more identifiable patents in that
+country that you have reason to believe are valid.
+
+  If, pursuant to or in connection with a single transaction or
+arrangement, you convey, or propagate by procuring conveyance of, a
+covered work, and grant a patent license to some of the parties
+receiving the covered work authorizing them to use, propagate, modify
+or convey a specific copy of the covered work, then the patent license
+you grant is automatically extended to all recipients of the covered
+work and works based on it.
+
+  A patent license is "discriminatory" if it does not include within
+the scope of its coverage, prohibits the exercise of, or is
+conditioned on the non-exercise of one or more of the rights that are
+specifically granted under this License.  You may not convey a covered
+work if you are a party to an arrangement with a third party that is
+in the business of distributing software, under which you make payment
+to the third party based on the extent of your activity of conveying
+the work, and under which the third party grants, to any of the
+parties who would receive the covered work from you, a discriminatory
+patent license (a) in connection with copies of the covered work
+conveyed by you (or copies made from those copies), or (b) primarily
+for and in connection with specific products or compilations that
+contain the covered work, unless you entered into that arrangement,
+or that patent license was granted, prior to 28 March 2007.
+
+  Nothing in this License shall be construed as excluding or limiting
+any implied license or other defenses to infringement that may
+otherwise be available to you under applicable patent law.
+
+  12. No Surrender of Others' Freedom.
+
+  If conditions are imposed on you (whether by court order, agreement or
+otherwise) that contradict the conditions of this License, they do not
+excuse you from the conditions of this License.  If you cannot convey a
+covered work so as to satisfy simultaneously your obligations under this
+License and any other pertinent obligations, then as a consequence you may
+not convey it at all.  For example, if you agree to terms that obligate you
+to collect a royalty for further conveying from those to whom you convey
+the Program, the only way you could satisfy both those terms and this
+License would be to refrain entirely from conveying the Program.
+
+  13. Use with the GNU Affero General Public License.
+
+  Notwithstanding any other provision of this License, you have
+permission to link or combine any covered work with a work licensed
+under version 3 of the GNU Affero General Public License into a single
+combined work, and to convey the resulting work.  The terms of this
+License will continue to apply to the part which is the covered work,
+but the special requirements of the GNU Affero General Public License,
+section 13, concerning interaction through a network will apply to the
+combination as such.
+
+  14. Revised Versions of this License.
+
+  The Free Software Foundation may publish revised and/or new versions of
+the GNU General Public License from time to time.  Such new versions will
+be similar in spirit to the present version, but may differ in detail to
+address new problems or concerns.
+
+  Each version is given a distinguishing version number.  If the
+Program specifies that a certain numbered version of the GNU General
+Public License "or any later version" applies to it, you have the
+option of following the terms and conditions either of that numbered
+version or of any later version published by the Free Software
+Foundation.  If the Program does not specify a version number of the
+GNU General Public License, you may choose any version ever published
+by the Free Software Foundation.
+
+  If the Program specifies that a proxy can decide which future
+versions of the GNU General Public License can be used, that proxy's
+public statement of acceptance of a version permanently authorizes you
+to choose that version for the Program.
+
+  Later license versions may give you additional or different
+permissions.  However, no additional obligations are imposed on any
+author or copyright holder as a result of your choosing to follow a
+later version.
+
+  15. Disclaimer of Warranty.
+
+  THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY
+APPLICABLE LAW.  EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT
+HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY
+OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO,
+THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+PURPOSE.  THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE PROGRAM
+IS WITH YOU.  SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF
+ALL NECESSARY SERVICING, REPAIR OR CORRECTION.
+
+  16. Limitation of Liability.
+
+  IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
+WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS
+THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY
+GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE
+USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF
+DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD
+PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS),
+EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
+SUCH DAMAGES.
+
+  17. Interpretation of Sections 15 and 16.
+
+  If the disclaimer of warranty and limitation of liability provided
+above cannot be given local legal effect according to their terms,
+reviewing courts shall apply local law that most closely approximates
+an absolute waiver of all civil liability in connection with the
+Program, unless a warranty or assumption of liability accompanies a
+copy of the Program in return for a fee.
+
+                     END OF TERMS AND CONDITIONS
+
+            How to Apply These Terms to Your New Programs
+
+  If you develop a new program, and you want it to be of the greatest
+possible use to the public, the best way to achieve this is to make it
+free software which everyone can redistribute and change under these terms.
+
+  To do so, attach the following notices to the program.  It is safest
+to attach them to the start of each source file to most effectively
+state the exclusion of warranty; and each file should have at least
+the "copyright" line and a pointer to where the full notice is found.
+
+    <one line to give the program's name and a brief idea of what it does.>
+    Copyright (C) <year>  <name of author>
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program.  If not, see <https://www.gnu.org/licenses/>.
+
+Also add information on how to contact you by electronic and paper mail.
+
+  If the program does terminal interaction, make it output a short
+notice like this when it starts in an interactive mode:
+
+    <program>  Copyright (C) <year>  <name of author>
+    This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
+    This is free software, and you are welcome to redistribute it
+    under certain conditions; type `show c' for details.
+
+The hypothetical commands `show w' and `show c' should show the appropriate
+parts of the General Public License.  Of course, your program's commands
+might be different; for a GUI interface, you would use an "about box".
+
+  You should also get your employer (if you work as a programmer) or school,
+if any, to sign a "copyright disclaimer" for the program, if necessary.
+For more information on this, and how to apply and follow the GNU GPL, see
+<https://www.gnu.org/licenses/>.
+
+  The GNU General Public License does not permit incorporating your program
+into proprietary programs.  If your program is a subroutine library, you
+may consider it more useful to permit linking proprietary applications with
+the library.  If this is what you want to do, use the GNU Lesser General
+Public License instead of this License.  But first, please read
+<https://www.gnu.org/licenses/why-not-lgpl.html>.

README.md

@@ -0,0 +1,125 @@
+# MiniRDS
+
+This program is designed for generating a realtime RDS signal. It is capable of RDS2 using up to 3 additional subcarriers.
+
+This is based on the RDS encoder from [Mpxgen](https://github.com/Anthony96922/mpxgen), which is currently not maintained.
+
+Note that some missing groups were added from [librds](https://flerken.zapto.org:1115/kuba/librds), [my](https://flerken.zapto.org:1115/kuba) other project
+
+#### Features
+- Low resource requirements
+- Support for basic RDS data fields: PS, RT, PTY and AF
+- RDS items can be updated through control pipe
+- RT+ support
+- RDS2 support (including station logo transmission)
+
+#### To do
+- Threading
+
+#### Planned features
+- UECP
+- Configuration file
+
+## What are the changes from normal MiniRDS?
+- CMake
+- better arguments
+- Option to disable ODA
+- Better Group Sequence (original had 0A 2A but here it is 0A 0A 0A 0A 2A 2A 2A 2A (2A) so PS appear instantly and RT is fast)
+- Added LIC and PIN
+- Most commands are compatible with the ASCII format that pira.cz uses
+- Custom groups (use `G=BBBBCCCCDDDD` or `CG AAAA BBBB CCCC DDDD`)
+- Mono! mono? Mono! Not stereo! why? because the 2 channels were exactly the same in the first place so there was no point in having a 2nd one
+
+## Build
+For Debian-like distros: `sudo apt-get install libao-dev libsamplerate0-dev` to install deps.
+
+Note that MiniRDS requires CMake to compile (install with `sudo apt install cmake`)
+
+Once those are installed, run
+```sh
+git clone https://flerken.zapto.org:1115/kuba/minirds
+cd minirds/src
+mkdir build
+cd build
+cmake ..
+make
+sudo make install
+```
+
+## How to use
+Simply run:
+```
+minirds
+```
+to confirm proper operation.
+
+Please see `-h` for more options.
+
+### Stereo Tool integration
+The following setup allows MiniRDS to be used alongside Stereo Tool audio processor.
+```
+.-------------.
+| Stereo Tool |--(FM MPX w/o RDS)-----.
+'-------------'                       |
+                                      v
+                           .-----------------------.
+                           |       ALSA dmixer     |
+                           | slave: MPX sound card |--------(to sound card)-------->
+                           |        192 kHz        |
+                           '-----------------------'
+                                      ^
+.---------.                           |
+| MiniRDS |--(RDS output)-------------'
+'---------'
+```
+
+First, add the following contents to ~/.asoundrc:
+```
+# ST MPX output
+pcm.mpxmix {
+  type dmix
+  ipc_key 1001
+  slave {
+    pcm "digital-out" # change to your actual sound card
+    rate 192000
+  }
+}
+```
+
+Next, add the collowing contents to ~/.ao:
+```
+dev=mpxmix
+```
+
+Then set the Stereo Tool MPX output to use the ALSA "mpxmix" output. Finally run minirds. *Adjust volumes accordingly.*
+
+Note that this setup is not optimal. Hans plans to add RDS2 passthough to the ST external RDS input. [Stereo Tool forum post](https://forums.stereotool.com/viewtopic.php?f=14&t=33793&start=150)
+
+If you need to you also can run MiniRDS on a ST transmitter modulated as mono audio, which does work however on some TXs the RDS signal may not be great due to harmonics of ST Pilot Tone
+
+### Changing PS, RT, TA and PTY at run-time
+You can control PS, RT, TA (Traffic Announcement flag), PTY (Program Type) and many other items at run-time using a named pipe (FIFO). For this run MiniRDS with the `--ctl` argument.
+
+Scripts can be written to obtain and send "now playing" text data to MiniRDS for dynamic RDS.
+
+See the [command list](doc/command_list.md) for a complete list of valid commands.
+
+### RDS2
+MiniRDS has a working implementation of the RFT protocol in RDS2. Please edit the Makefile accordingly and rebuild for RDS2 capabilities. You may use your own image by using the provided "make-station-logo.sh" script. Valid formats are PNG or JPG and should be about 3kB or less. Larger images take considerably longer to receive.
+
+## References
+- [EN 50067, Specification of the radio data system (RDS) for VHF/FM sound broadcasting in the frequency range 87.5 to 108.0 MHz](http://www.interactive-radio-system.com/docs/EN50067_RDS_Standard.pdf)
+- [IEC 62106-2, Radio data system (RDS) – Part 2: Message format: coding and definitions of RDS features](http://downloads.dxing.si/download.php?file=ISO%20Stamdards/RDS/latest%20(includes%20RDS2)/iec-62106-2-2021.pdf)
+- [IEC 62106-3, Radio data system (RDS) – Part 3: Usage and registration of Open Data Applications (ODAs)](http://downloads.dxing.si/download.php?file=ISO%20Stamdards/RDS/latest%20(includes%20RDS2)/iec-62106-3-2018.pdf)
+- [IEC 62106-4, Radio data system (RDS) – Part 4: Registered code tables](http://downloads.dxing.si/download.php?file=ISO%20Stamdards/RDS/latest%20(includes%20RDS2)/iec-62106-4-2018.pdf)
+- [IEC 62106-6, Radio data system (RDS) – Part 6: Compilation of technical specifications for Open Data Applications in the
+public domain](http://downloads.dxing.si/download.php?file=ISO%20Stamdards/RDS/latest%20(includes%20RDS2)/iec-62106-6-2018.pdf)
+- [P232 RDS Encoder
+Technical Manual](https://pira.cz/rds/p232man.pdf)
+- [PIRA32 RDS Encoder
+Technical Manual](https://pira.cz/rds/manual.pdf)
+
+## Credits
+Note that this is a fork of [Anthony96922](https://github.com/Anthony96922)'s [MiniRDS](https://github.com/Anthony96922/MiniRDS)
+
+The RDS waveform generator was adapted from [PiFmRds](https://github.com/ChristopheJacquet/PiFmRds)

doc/command_list.md

@@ -0,0 +1,25 @@
+## MiniRDS command list
+
+Most commands are in the ASCII format, for RT you can use `TEXT` or `RT1`, however some comamnds werent yet transitioned to the new command syntax, and here they are:
+
+### Commands
+
+#### `MPX`
+Set volumes in percent modulation for individual MPX subcarrier signals.
+
+`MPX 0,9,9,9,9`
+
+Carriers: (first to last)
+Pilot tone
+RDS 1
+RDS 2 (67 khz)
+RDS 2 (71 khz)
+RDS 2 (76 khz)
+
+#### `VOL`
+Set the output volume in percent.
+
+`VOL 100`
+
+## Other
+See src/supported_cmds.txt

src/CMakeLists.txt

@@ -0,0 +1,82 @@
+# This is from kuba's version of MiniRDS
+
+cmake_minimum_required(VERSION 3.10)
+
+# Project name and version
+project(minirds VERSION 1.0)
+
+# Define options
+option(ODA_RTP "Enable ODA (RT+)" ON)
+
+option(RDS2 "Enable RDS2 capabilities" OFF)
+option(RDS2_QUADRATURE_CARRIER "Shift RDS2 stream carriers by 90, 180, and 270 degrees" ON)
+option(RDS2_SYMBOL_SHIFTING "Enable RDS2 symbol shifting" ON)
+option(RDS2_DEBUG "Enable RDS2 debugging" OFF)
+
+option(STATIC_LIBSAMPLERATE "Use a static libsamplerate library (.a)" OFF)
+
+
+set(LIBSAMPLERATE_DIR "./libsamplerate" CACHE STRING "Directory for static libsamplerate")
+
+# Set compiler and flags
+set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -Wall -Werror -Wextra -pedantic -O2 -std=c18 -DVERSION=\"${PROJECT_VERSION}\"")
+
+# Define sources
+set(SOURCES
+    minirds.c
+    waveforms.c
+    rds.c
+)
+
+# Handle RDS2 options
+if(RDS2)
+    add_definitions(-DRDS2)
+    set(SOURCES ${SOURCES} rds2.c)
+    if(RDS2_QUADRATURE_CARRIER)
+        add_definitions(-DRDS2_QUADRATURE_CARRIER)
+    endif()
+    if(RDS2_SYMBOL_SHIFTING)
+        add_definitions(-DRDS2_SYMBOL_SHIFTING)
+    endif()
+endif()
+
+if(RDS2_DEBUG)
+    add_definitions(-DRDS2_DEBUG)
+endif()
+
+if(ODA_RTP)
+    add_definitions(-DODA)
+    add_definitions(-DODA_RTP)
+endif()
+
+set(SOURCES
+    ${SOURCES}
+    fm_mpx.c
+    control_pipe.c
+    osc.c
+    resampler.c
+    modulator.c
+    lib.c
+    ascii_cmd.c
+)
+
+# Define the executable
+add_executable(minirds ${SOURCES})
+
+# Handle libsamplerate linkage
+if(STATIC_LIBSAMPLERATE)
+    target_include_directories(minirds PRIVATE ${LIBSAMPLERATE_DIR}/include)
+    target_link_libraries(minirds PRIVATE ${LIBSAMPLERATE_DIR}/lib/libsamplerate.a)
+else()
+    find_library(SAMPLERATE_LIBRARY samplerate)
+    target_link_libraries(minirds PRIVATE ${SAMPLERATE_LIBRARY})
+endif()
+
+# Link additional libraries
+target_link_libraries(minirds PRIVATE m pthread pulse pulse-simple)
+
+# Install target
+install(TARGETS minirds DESTINATION /usr/local/bin)
+# Add profiling flags globally
+set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -O2")
+set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -O2")

src/ascii_cmd.c

@@ -0,0 +1,395 @@
+/*
+ * MiniRDS - FM RDS Encoder
+ * contains code from:
+ * mpxgen - FM multiplex encoder with Stereo and RDS
+ * Copyright (C) 2019 Anthony96922
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "common.h"
+#include "rds.h"
+#include "fm_mpx.h"
+#include "lib.h"
+#include "ascii_cmd.h"
+
+#define CMD_MATCHES(a) (ustrcmp(cmd, (unsigned char *)a) == 0)
+
+void process_ascii_cmd(unsigned char *str) {
+	unsigned char *cmd, *arg;
+	uint16_t cmd_len = 0;
+
+	cmd_len = _strnlen((const char*)str, CTL_BUFFER_SIZE);
+
+	if (cmd_len > 3 && str[2] == ' ') {
+		cmd = str;
+		cmd[2] = 0;
+		arg = str + 3;
+
+		if (CMD_MATCHES("CG")) {
+			/* this stays */
+			uint16_t blocks[4];
+			int count = sscanf((const char*)arg, "%hX %hX %hX %hX",
+							&blocks[0], &blocks[1],
+							&blocks[2], &blocks[3]);
+			if (count == 4) {
+				set_rds_cg(blocks);
+			}
+			return;
+		}
+	}
+
+	if (cmd_len > 4 && str[3] == ' ') {
+		cmd = str;
+		cmd[3] = 0;
+		arg = str + 4;
+
+		if (CMD_MATCHES("MPX")) {
+#ifdef RDS2
+			float gains[5];
+			if (sscanf((char *)arg, "%f,%f,%f,%f,%f",
+				&gains[0], &gains[1], &gains[2], &gains[3],
+				&gains[4]) == 5) {
+				set_carrier_volume(0, gains[0]);
+				set_carrier_volume(1, gains[1]);
+				set_carrier_volume(2, gains[2]);
+				set_carrier_volume(3, gains[3]);
+				set_carrier_volume(4, gains[4]);
+			}
+#else
+			float gains[2];
+			if (sscanf((char *)arg, "%f,%f",
+					   &gains[0], &gains[1]) == 2)
+			{
+				set_carrier_volume(0, gains[0]);
+				set_carrier_volume(1, gains[1]);
+			}
+#endif
+			return;
+		}
+		if (CMD_MATCHES("VOL")) {
+			arg[4] = 0;
+			set_output_volume(strtof((char *)arg, NULL));
+			return;
+		}
+	}
+
+	if(cmd_len == 5) {
+		cmd = str;
+		if(CMD_MATCHES("AFCH=")) {
+			clear_rds_af();
+			return;
+		}
+	}
+	if (cmd_len > 5 && str[4] == '=') {
+		/* compatibilty with existing (standarts)*/
+		cmd = str;
+		cmd[4] = 0;
+		arg = str + 5;
+		if (CMD_MATCHES("TEXT")) {
+			arg[RT_LENGTH * 2] = 0;
+			set_rds_rt1(xlat(arg));
+			return;
+		}
+		if (CMD_MATCHES("PTYN")) {
+			arg[PTYN_LENGTH] = 0;
+			set_rds_ptyn(xlat(arg));
+			return;
+		}
+		if (CMD_MATCHES("AFCH")) {
+			if(arg[0] == 'A' || arg[0] == 'B') {
+				return;
+			}
+			clear_rds_af();
+			uint8_t arg_count;
+			rds_af_t new_af;
+			uint8_t af[MAX_AFS], *af_iter;
+			arg_count = sscanf((char *)arg,
+				"%hhx,%hhx,%hhx,%hhx,%hhx," /* AF list */
+				"%hhx,%hhx,%hhx,%hhx,%hhx,"
+				"%hhx,%hhx,%hhx,%hhx,%hhx,"
+				"%hhx,%hhx,%hhx,%hhx,%hhx,"
+				"%hhx,%hhx,%hhx,%hhx,%hhx",
+			&af[0],  &af[1],  &af[2],  &af[3],  &af[4],
+			&af[5],  &af[6],  &af[7],  &af[8],  &af[9],
+			&af[10], &af[11], &af[12], &af[13], &af[14],
+			&af[15], &af[16], &af[17], &af[18], &af[19],
+			&af[20], &af[21], &af[22], &af[23], &af[24]);
+
+			af_iter = af;
+			memset(&new_af, 0, sizeof(struct rds_af_t));
+			while (arg_count-- != 0) {
+				uint8_t current_value = *af_iter;
+				float frequency = (875.0 + current_value) / 10.0;
+				add_rds_af(&new_af, frequency);
+				af_iter++;
+			}
+			set_rds_af(new_af);
+			return;
+		}
+	}
+
+	if(cmd_len == 4) {
+		cmd = str;
+		if(CMD_MATCHES("TPS=")) {
+			set_rds_tpson(0);
+			return;
+		}
+		if(CMD_MATCHES("LPS=")) {
+			set_rds_lpson(0);
+			return;
+		}
+	}
+	if (cmd_len > 4 && str[3] == '=') {
+		cmd = str;
+		cmd[3] = 0;
+		arg = str + 4;
+		if (CMD_MATCHES("TPS")) {
+			arg[PS_LENGTH * 2] = 0;
+			set_rds_tps(xlat(arg));
+			set_rds_tpson(1);
+			return;
+		}
+		if (CMD_MATCHES("RT1")) {
+			arg[RT_LENGTH * 2] = 0;
+			set_rds_rt1(xlat(arg));
+			return;
+		}
+		if (CMD_MATCHES("PTY")) {
+			arg[2] = 0;
+			set_rds_pty(strtoul((char *)arg, NULL, 10));
+			return;
+		}
+		if (CMD_MATCHES("ECC")) {
+			arg[2] = 0;
+			set_rds_ecc(strtoul((char *)arg, NULL, 16));
+			return;
+		}
+		if (CMD_MATCHES("LIC")) {
+			arg[2] = 0;
+			set_rds_lic(strtoul((char *)arg, NULL, 16));
+			return;
+		}
+
+		#ifdef ODA_RTP
+		if (CMD_MATCHES("RTP")) {
+			char tag_names[2][32];
+			uint8_t tags[6];
+			if (sscanf((char *)arg, "%hhu,%hhu,%hhu,%hhu,%hhu,%hhu",
+				&tags[0], &tags[1], &tags[2], &tags[3],
+				&tags[4], &tags[5]) == 6) {
+				set_rds_rtplus_tags(tags);
+			} else if (sscanf((char *)arg, "%31[^,],%hhu,%hhu,%31[^,],%hhu,%hhu",
+				tag_names[0], &tags[1], &tags[2],
+				tag_names[1], &tags[4], &tags[5]) == 6) {
+				tags[0] = get_rtp_tag_id(tag_names[0]);
+				tags[3] = get_rtp_tag_id(tag_names[1]);
+				set_rds_rtplus_tags(tags);
+			}
+			return;
+		}
+		#endif
+
+		if (CMD_MATCHES("LPS")) {
+			arg[LPS_LENGTH] = 0;
+			set_rds_lpson(1);
+			set_rds_lps(arg);
+			return;
+		}
+
+		if (CMD_MATCHES("PIN")) {
+			uint8_t pin[3];
+			if (sscanf((char *)arg, "%hhu,%hhu,%hhu",
+				&pin[0], &pin[1], &pin[2]) == 3) {
+					set_rds_pin(pin[0], pin[1], pin[2]);
+			}
+			return;
+		}
+	}
+	if(cmd_len == 3) {
+		cmd = str;
+		if(CMD_MATCHES("AF=")) {
+			clear_rds_af();
+			return;
+		}
+	}
+	if (cmd_len > 3 && str[2] == '=') {
+		cmd = str;
+		cmd[2] = 0;
+		arg = str + 3;
+
+		if (CMD_MATCHES("PS")) {
+			if(arg[0] == '\0') arg[0] = ' '; /* fix for strings that start with a space idk why but tps works fine with space started strings */
+			arg[PS_LENGTH * 2] = 0;
+			set_rds_ps(xlat(arg));
+			return;
+		}
+		if (CMD_MATCHES("CT")) {
+			set_rds_ct(arg[0]);
+			return;
+		}
+		if (CMD_MATCHES("DI")) {
+			arg[2] = 0;
+			set_rds_di(strtoul((char *)arg, NULL, 10));
+			return;
+		}
+		if (CMD_MATCHES("TP")) {
+			set_rds_tp(arg[0]);
+			return;
+		}
+		if (CMD_MATCHES("TA")) {
+			set_rds_ta(arg[0]);
+			return;
+		}
+		if (CMD_MATCHES("MS")) {
+			set_rds_ms(arg[0]);
+			return;
+		}
+		if (CMD_MATCHES("PI")) {
+			arg[4] = 0;
+			set_rds_pi(strtoul((char *)arg, NULL, 16));
+			return;
+		}
+
+		if (CMD_MATCHES("AF")) {
+			if(arg[0] == 'A' || arg[0] == 'B') {
+				return;
+			}
+			clear_rds_af();
+			uint8_t arg_count;
+			rds_af_t new_af;
+			float af[MAX_AFS], *af_iter;
+			arg_count = sscanf((char *)arg,
+				"%f,%f,%f,%f,%f," /* AF list */
+				"%f,%f,%f,%f,%f,"
+				"%f,%f,%f,%f,%f,"
+				"%f,%f,%f,%f,%f,"
+				"%f,%f,%f,%f,%f",
+			&af[0],  &af[1],  &af[2],  &af[3],  &af[4],
+			&af[5],  &af[6],  &af[7],  &af[8],  &af[9],
+			&af[10], &af[11], &af[12], &af[13], &af[14],
+			&af[15], &af[16], &af[17], &af[18], &af[19],
+			&af[20], &af[21], &af[22], &af[23], &af[24]);
+			af_iter = af;
+			memset(&new_af, 0, sizeof(struct rds_af_t));
+			while (arg_count-- != 0) {
+				add_rds_af(&new_af, *af_iter++);
+			}
+			set_rds_af(new_af);
+			return;
+		}
+	}
+
+	if (cmd_len > 2 && str[1] == '=') {
+		cmd = str;
+		cmd[1] = 0;
+		arg = str + 2;
+		if (CMD_MATCHES("G")) {
+			uint16_t blocks[4];
+			if(cmd_len == 18){
+				/* RDS2 Group*/
+				/* do a ifdef rds2 here when implementing*/
+			} else if(cmd_len == 14) {
+				/* RDS1 Group*/
+				blocks[0] = get_rds_pi();
+				int count = sscanf((char *)arg, "%4hx%4hx%4hx", &blocks[1], &blocks[2], &blocks[3]);
+				if(count == 3) {
+					set_rds_cg(blocks);
+				}
+			}
+			return;
+		}
+	}
+	if (cmd_len > 6 && str[5] == '=') {
+		cmd = str;
+		cmd[5] = 0;
+		arg = str + 6;
+
+		if (CMD_MATCHES("PINEN")) {
+			arg[1] = 0;
+			set_rds_pin_enabled(strtoul((char *)arg, NULL, 10));
+			return;
+		}
+
+		if (CMD_MATCHES("RT1EN")) {
+			set_rds_rt1_enabled(arg[0]);
+			return;
+		}
+	}
+
+	if (cmd_len > 6 && str[5] == '=') {
+		cmd = str;
+		cmd[5] = 0;
+		arg = str + 6;
+		if (CMD_MATCHES("LEVEL")) {
+			uint8_t val = strtoul((char *)arg, NULL, 10);
+			val /= 255;
+			val *= 15; /* max value*/
+			#ifdef RDS2
+			set_carrier_volume(1, val);
+			set_carrier_volume(2, val);
+			#else
+			set_carrier_volume(1, val);
+			#endif
+			return;
+		}
+	}
+	if (cmd_len > 7 && str[6] == '=') {
+		cmd = str;
+		cmd[6] = 0;
+		arg = str + 7;
+
+		if (CMD_MATCHES("RDSGEN")) {
+			arg[1] = 0;
+			set_rdsgen(strtoul((char *)arg, NULL, 10));
+			return;
+		}
+
+		if (CMD_MATCHES("PTYNEN")) {
+			arg[1] = 0;
+			set_rds_ptyn_enabled(strtoul((char *)arg, NULL, 10));
+			return;
+		}
+
+		#ifdef ODA_RTP
+		if (CMD_MATCHES("RTPRUN")) {
+			arg[1] = 0;
+			set_rds_rtplus_flags(strtoul((char *)arg, NULL, 10));
+			return;
+		}
+		#endif
+	}
+	if (cmd_len > 6 && str[5] == '=') {
+		cmd = str;
+		cmd[5] = 0;
+		arg = str + 6;
+		if (CMD_MATCHES("LEVEL")) {
+			uint8_t val = strtoul((char *)arg, NULL, 10);
+			val /= 255;
+			val *= 15; /* max value*/
+			#ifdef RDS2
+			set_carrier_volume(1, val);
+			set_carrier_volume(2, val);
+			#else
+			set_carrier_volume(1, val);
+			#endif
+			return;
+		}
+
+		if (CMD_MATCHES("ECCEN")) {
+			set_rds_ecclic_toggle(arg[0]);
+			return;
+		}
+	}
+}

src/ascii_cmd.h

@@ -0,0 +1,23 @@
+/*
+ * mpxgen - FM multiplex encoder with Stereo and RDS
+ * Copyright (C) 2019 Anthony96922
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#define CMD_BUFFER_SIZE	255
+#define CTL_BUFFER_SIZE	(CMD_BUFFER_SIZE * 2)
+#define READ_TIMEOUT_MS	100
+
+extern void process_ascii_cmd(unsigned char *cmd);

src/common.h

@@ -0,0 +1,33 @@
+/*
+ * mpxgen - FM multiplex encoder with Stereo and RDS
+ * Copyright (C) 2019-2021 Anthony96922
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+/* common includes for mpxgen */
+#include <stdint.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <string.h>
+#include <math.h>
+#include <stdbool.h>
+
+/* workaround for missing pi definition */
+#ifndef M_PI
+#define M_PI	3.14159265358979323846
+#endif
+
+#define M_2PI	(M_PI * 2.0)

src/control_pipe.c

@@ -0,0 +1,84 @@
+/*
+ * mpxgen - FM multiplex encoder with Stereo and RDS
+ * Copyright (C) 2019 Anthony96922
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "common.h"
+#include "ascii_cmd.h"
+#include "control_pipe.h"
+
+static int fd;
+static struct pollfd poller;
+
+/*
+ * Opens a file (pipe) to be used to control the RDS coder.
+ */
+int open_control_pipe(char *filename) {
+	fd = open(filename, O_RDONLY | O_NONBLOCK);
+	if (fd == -1) return -1;
+
+	/* setup the poller */
+	poller.fd = fd;
+	poller.events = POLLIN;
+
+	return 0;
+}
+
+/*
+ * Polls the control file (pipe), and if a command is received,
+ * calls process_ascii_cmd.
+ */
+void poll_control_pipe() {
+	static unsigned char pipe_buf[CTL_BUFFER_SIZE];
+	static unsigned char cmd_buf[CMD_BUFFER_SIZE];
+	struct timeval timeout;
+	int ret;
+	fd_set set;
+	char *token;
+
+	FD_ZERO(&set);
+	FD_SET(fd, &set);
+	timeout.tv_sec = 0;
+	timeout.tv_usec = READ_TIMEOUT_MS * 1000;
+
+	/* check for new commands */
+	if (poll(&poller, 1, READ_TIMEOUT_MS) <= 0) return;
+
+	/* return early if there are no new commands */
+	if (poller.revents == 0) return;
+
+	memset(pipe_buf, 0, CTL_BUFFER_SIZE);
+
+	ret = select(fd + 1, &set, NULL, NULL, &timeout);
+	if (ret == -1 || ret == 0) {
+		return;
+	} else {
+		read(fd, pipe_buf, CTL_BUFFER_SIZE - 1);
+	}
+
+	/* handle commands per line this is really good because if were sending text commands very quick after eachother then we can get a rt of for example 'Now its 12:00RT Now its 12:01' */
+	token = strtok((char *)pipe_buf, "\n");
+	while (token != NULL) {
+		memset(cmd_buf, 0, CMD_BUFFER_SIZE);
+		memcpy(cmd_buf, token, CMD_BUFFER_SIZE - 1);
+		token = strtok(NULL, "\n");
+
+		process_ascii_cmd(cmd_buf);
+	}
+}
+void close_control_pipe() {
+	if (fd > 0) close(fd);
+}

src/control_pipe.h

@@ -0,0 +1,25 @@
+/*
+ * mpxgen - FM multiplex encoder with Stereo and RDS
+ * Copyright (C) 2019 Anthony96922
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <fcntl.h>
+#include <poll.h>
+#include <sys/select.h>
+
+extern int open_control_pipe(char *filename);
+extern void close_control_pipe();
+extern void poll_control_pipe();

src/fm_mpx.c

@@ -0,0 +1,178 @@
+/*
+ * mpxgen - FM multiplex encoder with Stereo and RDS
+ * Copyright (C) 2019 Anthony96922
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "common.h"
+
+#include "rds.h"
+#ifdef RDS2
+#include "rds2.h"
+#endif
+#include "fm_mpx.h"
+#include "osc.h"
+
+/*
+ * Local oscillator objects
+ * this is where the MPX waveforms are stored
+ *
+ */
+static struct osc_t osc_57k;
+#ifdef RDS2
+static struct osc_t osc_67k;
+static struct osc_t osc_71k;
+static struct osc_t osc_76k;
+#endif
+
+static float mpx_vol;
+
+static uint8_t rdsgen;
+
+void set_output_volume(float vol) {
+	if (vol > 100.0f) vol = 100.0f;
+	mpx_vol = vol / 100.0f;
+}
+
+void set_rdsgen(uint8_t gen) {
+	#ifdef RDS2
+	if (gen > 2) gen = 2;
+	#else
+	if (gen > 1) gen = 1;
+	#endif
+	rdsgen = gen;
+}
+
+/* subcarrier volumes */
+static float volumes[MPX_SUBCARRIER_END] = {
+	0.0f, /* pilot tone: 0% */
+	1.0f, /* RDS: 7.5% modulation */
+#ifdef RDS2
+	/* RDS2 */
+	0.05f, //66.5  khz 5%
+	0.05f, //71.25 khz 5%
+	0.0f  //76     khz 0%
+#endif
+};
+
+void set_carrier_volume(uint8_t carrier, float new_volume) {
+	/* check for valid index */
+	if (carrier >= MPX_SUBCARRIER_END) return;
+
+	/* don't allow levels over 15% */
+	if (new_volume >= 15.0f) new_volume = 15.0f;
+
+	volumes[carrier] = new_volume / 100.0f;
+}
+
+void fm_mpx_init(uint32_t sample_rate) {
+	/* initialize the subcarrier oscillators */
+	osc_init(&osc_57k, sample_rate, 57000.0f);
+	rdsgen = 1;
+#ifdef RDS2
+	osc_init(&osc_67k, sample_rate, 66500.0f);
+	osc_init(&osc_71k, sample_rate, 71250.0f);
+	osc_init(&osc_76k, sample_rate, 76000.0f);
+	rdsgen = 2;
+#endif
+}
+
+void fm_rds_get_frames(float *outbuf, size_t num_frames) {
+	size_t j = 0;
+	float out;
+
+	for (size_t i = 0; i < num_frames; i++) {
+		out = 0.0f;
+
+		#ifdef RDS2
+		out += osc_get_cos(&osc_57k)
+			* get_rds_sample(0, 0)
+			* volumes[MPX_SUBCARRIER_RDS_STREAM_0];
+		#else
+		out += get_rds_sample(0)
+			* volumes[MPX_SUBCARRIER_RDS_STREAM_0];
+		#endif
+#ifdef RDS2
+#ifdef RDS2_QUADRATURE_CARRIER
+		/* RDS2 is quadrature phase */
+
+		/* 90 degree shift */
+		if(rdsgen == 2 && volumes[MPX_SUBCARRIER_RDS2_STREAM_1] != 0) {
+			out += osc_get_sin(&osc_67k)
+				* get_rds_sample(1, 0)
+				* volumes[MPX_SUBCARRIER_RDS2_STREAM_1];
+		}
+
+		/* 180 degree shift */
+		if(rdsgen == 2 && volumes[MPX_SUBCARRIER_RDS2_STREAM_2] != 0) {
+			out += -osc_get_cos(&osc_71k)
+				* get_rds_sample(2, 0)
+				* volumes[MPX_SUBCARRIER_RDS2_STREAM_2];
+		}
+
+		/* 270 degree shift */
+		if(rdsgen == 2 && volumes[MPX_SUBCARRIER_RDS2_STREAM_3] != 0) {
+			out += -osc_get_sin(&osc_76k)
+				* get_rds_sample(3, 0)
+				* volumes[MPX_SUBCARRIER_RDS2_STREAM_3];
+		}
+#else
+		if(rdsgen == 2 && volumes[MPX_SUBCARRIER_RDS2_STREAM_1] != 0) {
+			out += osc_get_cos(&osc_67k)
+				* get_rds_sample(1, 0)
+				* volumes[MPX_SUBCARRIER_RDS2_STREAM_1];
+		}
+
+		if(rdsgen == 2 && volumes[MPX_SUBCARRIER_RDS2_STREAM_1] != 0) {
+			out += osc_get_cos(&osc_71k)
+				* get_rds_sample(2, 0)
+				* volumes[MPX_SUBCARRIER_RDS2_STREAM_2];
+		}
+
+		if(rdsgen == 2 && volumes[MPX_SUBCARRIER_RDS2_STREAM_3] != 0) {
+			out += osc_get_cos(&osc_76k)
+				* get_rds_sample(3, 0)
+				* volumes[MPX_SUBCARRIER_RDS2_STREAM_3];
+		}
+#endif
+#endif
+
+		/* update oscillator */
+		osc_update_pos(&osc_57k);
+#ifdef RDS2
+		osc_update_pos(&osc_67k);
+		osc_update_pos(&osc_71k);
+		osc_update_pos(&osc_76k);
+#endif
+
+		/* declipper */
+		out = fminf(+1.0f, out);
+		out = fmaxf(-1.0f, out);
+
+		/* adjust volume and put into channel */
+		if(rdsgen != 0) outbuf[j] = out * mpx_vol;
+		j++;
+
+	}
+}
+
+void fm_mpx_exit() {
+	osc_exit(&osc_57k);
+#ifdef RDS2
+	osc_exit(&osc_67k);
+	osc_exit(&osc_71k);
+	osc_exit(&osc_76k);
+#endif
+}

src/fm_mpx.h

@@ -0,0 +1,45 @@
+/*
+ * mpxgen - FM multiplex encoder with Stereo and RDS
+ * Copyright (C) 2019 Anthony96922
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+/* MPX */
+#define NUM_MPX_FRAMES_IN	512
+#define NUM_MPX_FRAMES_OUT	(NUM_MPX_FRAMES_IN * 2)
+/*
+ * The sample rate at which the MPX generation runs at
+ */
+#define MPX_SAMPLE_RATE		RDS_SAMPLE_RATE
+
+#define OUTPUT_SAMPLE_RATE	192000
+
+enum mpx_subcarriers {
+	MPX_SUBCARRIER_ST_PILOT,
+	MPX_SUBCARRIER_RDS_STREAM_0,
+#ifdef RDS2
+	MPX_SUBCARRIER_RDS2_STREAM_1,
+	MPX_SUBCARRIER_RDS2_STREAM_2,
+	MPX_SUBCARRIER_RDS2_STREAM_3,
+#endif
+	MPX_SUBCARRIER_END
+};
+
+extern void fm_mpx_init(uint32_t sample_rate);
+extern void fm_rds_get_frames(float *outbuf, size_t num_frames);
+extern void fm_mpx_exit();
+extern void set_output_volume(float vol);
+extern void set_rdsgen(uint8_t gen);
+extern void set_carrier_volume(uint8_t carrier, float new_volume);

src/lib.c

@@ -0,0 +1,519 @@
+/*
+ * mpxgen - FM multiplex encoder with Stereo and RDS
+ * Copyright (C) 2021 Anthony96922
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "common.h"
+#include "rds.h"
+#include <time.h>
+
+/*
+ * Stuff common for both RDS and RDS2
+ *
+ */
+
+/* needed workaround implicit declaration (edit: do we need this? ) */
+extern int nanosleep(const struct timespec *req, struct timespec *rem);
+
+/* millisecond sleep */
+void msleep(unsigned long ms) {
+	struct timespec ts;
+	ts.tv_sec = ms / 1000ul;		/* whole seconds */
+	ts.tv_nsec = (ms % 1000ul) * 1000;	/* remainder, in nanoseconds */
+	nanosleep(&ts, NULL);
+}
+
+/* just like strlen */
+size_t _strnlen(const char *s, size_t maxlen) {
+	size_t len = 0;
+	while (s[len] != 0 && len < maxlen)
+		len++;
+	return len;
+}
+
+/* unsigned equivalent of strcmp */
+int ustrcmp(const unsigned char *s1, const unsigned char *s2) {
+	unsigned char c1, c2;
+
+	do {
+		c1 = *s1++;
+		c2 = *s2++;
+		if (c1 == '\0')
+			return c1 - c2;
+	} while (c1 == c2);
+
+	return c1 - c2;
+}
+
+#ifdef ODA_RTP
+static char *rtp_content_types[64] = {
+	/* dummy */
+	"DUMMY_CLASS",
+	/* item */
+	"ITEM.TITLE",
+	"ITEM.ALBUM",
+	"ITEM.TRACKNUMBER",
+	"ITEM.ARTIST",
+	"ITEM.COMPOSITION",
+	"ITEM.MOVEMENT",
+	"ITEM.CONDUCTOR",
+	"ITEM.COMPOSER",
+	"ITEM.BAND",
+	"ITEM.COMMENT",
+	"ITEM.GENRE",
+	/* info */
+	"INFO.NEWS",
+	"INFO.NEWS.LOCAL",
+	"INFO.STOCKMARKET",
+	"INFO.SPORT",
+	"INFO.LOTTERY",
+	"INFO.HOROSCOPE",
+	"INFO.DAILY_DIVERSION",
+	"INFO.HEALTH",
+	"INFO.EVENT",
+	"INFO.SCENE",
+	"INFO.CINEMA",
+	"INFO.TV",
+	"INFO.DATE_TIME",
+	"INFO.WEATHER",
+	"INFO.TRAFFIC",
+	"INFO.ALARM",
+	"INFO.ADVERTISEMENT",
+	"INFO.URL",
+	"INFO.OTHER",
+	/* program */
+	"STATIONNAME.SHORT",
+	"STATIONNAME.LONG",
+	"PROGRAMME.NOW",
+	"PROGRAMME.NEXT",
+	"PROGRAMME.PART",
+	"PROGRAMME.HOST",
+	"PROGRAMME.EDITORIAL_STAFF",
+	"PROGRAMME.FREQUENCY",
+	"PROGRAMME.HOMEPAGE",
+	"PROGRAMME.SUBCHANNEL",
+	/* interactivity */
+	"PHONE.HOTLINE",
+	"PHONE.STUDIO",
+	"PHONE.OTHER",
+	"SMS.STUDIO",
+	"SMS.OTHER",
+	"EMAIL.HOTLINE",
+	"EMAIL.STUDIO",
+	"EMAIL.OTHER",
+	"MMS.OTHER",
+	"CHAT",
+	"CHAT.CENTRE",
+	"VOTE.QUESTION",
+	"VOTE.CENTRE",
+	/* rfu */
+	"RFU_1",
+	"RFU_2",
+	/* private classes */
+	"PRIVATE_1",
+	"PRIVATE_2",
+	"PRIVATE_3",
+	/* descriptor */
+	"PLACE",
+	"APPOINTMENT",
+	"IDENTIFIER",
+	"PURCHASE",
+	"GET_DATA"
+};
+
+uint8_t get_rtp_tag_id(char *rtp_tag_name) {
+	uint8_t tag_id = 0;
+	for (uint8_t i = 0; i < 64; i++) {
+		if (strcmp(rtp_tag_name, rtp_content_types[i]) == 0) {
+			tag_id = i;
+			break;
+		}
+	}
+	return tag_id;
+}
+
+char *get_rtp_tag_name(uint8_t rtp_tag) {
+	if (rtp_tag > 63) rtp_tag = 0;
+	return rtp_content_types[rtp_tag];
+}
+#endif
+static uint16_t offset_words[] = {
+	0x0FC, /*  A  */
+	0x198, /*  B  */
+	0x168, /*  C  */
+	0x1B4, /*  D  */
+	0x350  /*  C' */
+};
+
+/* CRC-16 ITU-T/CCITT checkword calculation */
+/* wanna ask where is this used */
+uint16_t crc16(uint8_t *data, size_t len) {
+	uint16_t crc = 0xffff;
+
+	for (size_t i = 0; i < len; i++) {
+		crc = (crc >> 8) | (crc << 8);
+		crc ^= data[i];
+		crc ^= (crc & 0xff) >> 4;
+		crc ^= (crc << 8) << 4;
+		crc ^= ((crc & 0xff) << 4) << 1;
+	}
+
+	return crc ^ 0xffff;
+}
+
+/* Calculate the checkword for each block and emit the bits */
+#ifdef RDS2
+void add_checkwords(uint16_t *blocks, uint8_t *bits, bool rds2)
+#else
+void add_checkwords(uint16_t *blocks, uint8_t *bits)
+#endif
+{
+	size_t i, j;
+	uint8_t bit, msb;
+	uint16_t block, block_crc, check, offset_word;
+	bool group_type_b = false;
+#ifdef RDS2
+	bool tunneling_type_b = false;
+#endif
+
+	/* if b11 is 1, then type B */
+#ifdef RDS2
+	if (!rds2 && IS_TYPE_B(blocks))
+#else
+	if (IS_TYPE_B(blocks))
+#endif
+		group_type_b = true;
+
+#ifdef RDS2
+	/* for when version B groups are coded in RDS2 */
+	if (rds2 && IS_TUNNELING(blocks) && IS_TYPE_B(blocks))
+		tunneling_type_b = true;
+#endif
+
+	for (i = 0; i < GROUP_LENGTH; i++) {
+#ifdef RDS2
+		/*
+		 * If tunneling type B groups use offset
+		 * word C' for block 3
+		 */
+		if (rds2 && i == 2 && tunneling_type_b) {
+			offset_word = offset_words[4];
+		} else
+#endif
+		/* Group version B needs C' for block 3 */
+		if (i == 2 && group_type_b) {
+			offset_word = offset_words[4];
+		} else {
+			offset_word = offset_words[i];
+		}
+
+		block = blocks[i];
+
+		/* Classical CRC computation */
+		block_crc = 0;
+		for (j = 0; j < BLOCK_SIZE; j++) {
+			bit = (block & (INT16_15 >> j)) != 0;
+			msb = (block_crc >> (POLY_DEG - 1)) & 1;
+			block_crc <<= 1;
+			if (msb ^ bit) block_crc ^= POLY;
+			*bits++ = bit;
+		}
+		check = block_crc ^ offset_word;
+		for (j = 0; j < POLY_DEG; j++) {
+			*bits++ = (check & ((1 << (POLY_DEG - 1)) >> j)) != 0;
+		}
+	}
+}
+
+/*
+ * AF stuff
+ */
+uint8_t add_rds_af(struct rds_af_t *af_list, float freq) {
+	uint16_t af;
+	uint8_t entries_reqd = 1; /* default for FM */
+
+	/*
+	 * check how many slots are required for the frequency
+	 *
+	 * LF/MF (AM) needs 2 entries: one for the
+	 * AM follows code and the freq code itself
+	 */
+	if (freq < 87.6f || freq > 107.9f) { /* is LF/MF */
+		entries_reqd = 2;
+	}
+
+	/* check if the AF list is full */
+	if (af_list->num_afs + entries_reqd > MAX_AFS) {
+		/* Too many AF entries */
+		return 1;
+	}
+
+	/* check if new frequency is valid */
+	if (freq >= 87.6f && freq <= 107.9f) { /* FM */
+		af = (uint16_t)(freq * 10.0f) - 875;
+		af_list->afs[af_list->num_entries] = af;
+		af_list->num_entries += 1;
+	} else if (freq >= 153.0f && freq <= 279.0f) { /* LF */
+		af = (uint16_t)(freq - 153.0f) / 9 + 1;
+		af_list->afs[af_list->num_entries + 0] = AF_CODE_LFMF_FOLLOWS;
+		af_list->afs[af_list->num_entries + 1] = af;
+		af_list->num_entries += 2;
+	} else if (freq >= 531.0f && freq <= 1602.0f) { /* AM 9 kHz spacing */
+		af = (uint16_t)(freq - 531.0f) / 9 + 16;
+		af_list->afs[af_list->num_entries + 0] = AF_CODE_LFMF_FOLLOWS;
+		af_list->afs[af_list->num_entries + 1] = af;
+		af_list->num_entries += 2;
+	} else {
+		return 1;
+	}
+
+	af_list->num_afs++;
+
+	return 0;
+}
+
+char *show_af_list(struct rds_af_t af_list) {
+	float freq;
+	bool is_lfmf = false;
+	static char outstr[255];
+	uint8_t outstrlen = 0;
+
+	outstrlen += sprintf(outstr, "AF: %u,", af_list.num_afs);
+
+	for (uint8_t i = 0; i < af_list.num_entries; i++) {
+		if (af_list.afs[i] == AF_CODE_LFMF_FOLLOWS) {
+			/* The next AF will be for LF/MF */
+			is_lfmf = true;
+			continue;
+		}
+
+		if (is_lfmf) {
+			if (af_list.afs[i] >= 1 && af_list.afs[i] <= 15) { /* LF */
+				freq = 153.0f + ((float)(af_list.afs[i] -  1) * 9.0f);
+				outstrlen += sprintf(outstr + outstrlen, " (LF)%.0f", freq);
+			} else { /*if (af_list.afs[i] >= 16 && af_list.afs[i] <= 135) {*/ /* MF */
+				freq = 531.0f + ((float)(af_list.afs[i] - 16) * 9.0f);
+				outstrlen += sprintf(outstr + outstrlen, " (MF)%.0f", freq);
+			}
+			is_lfmf = false;
+			continue;
+		}
+
+		/* FM */
+		freq = (float)((uint16_t)af_list.afs[i] + 875) / 10.0f;
+		outstrlen += sprintf(outstr + outstrlen, " %.1f", freq);
+	}
+
+	return outstr;
+}
+
+/*
+ * UTF-8 to RDS char set converter
+ *
+ * Translates certain chars into their RDS equivalents
+ * NOTE!! Only applies to PS, RT and PTYN. LPS uses UTF-8 (SCB = 1)
+ *
+ */
+#define XLATSTRLEN	255
+unsigned char *xlat(unsigned char *str) {
+	static unsigned char new_str[XLATSTRLEN];
+	uint8_t i = 0;
+
+	while (*str != 0 && i < XLATSTRLEN) {
+		switch (*str) {
+		case 0xc2:
+			str++;
+			switch (*str) {
+			case 0xa1: new_str[i] = 0x8e; break; /* INVERTED EXCLAMATION MARK */
+			case 0xa3: new_str[i] = 0xaa; break; /* POUND SIGN */
+			case 0xa7: new_str[i] = 0xbf; break; /* SECTION SIGN */
+			case 0xa9: new_str[i] = 0xa2; break; /* COPYRIGHT SIGN */
+			case 0xaa: new_str[i] = 0xa0; break; /* FEMININE ORDINAL INDICATOR */
+			case 0xb0: new_str[i] = 0xbb; break; /* DEGREE SIGN */
+			case 0xb1: new_str[i] = 0xb4; break; /* PLUS-MINUS SIGN */
+			case 0xb2: new_str[i] = 0xb2; break; /* SUPERSCRIPT TWO */
+			case 0xb3: new_str[i] = 0xb3; break; /* SUPERSCRIPT THREE */
+			case 0xb5: new_str[i] = 0xb8; break; /* MIKRO SIGN */
+			case 0xb9: new_str[i] = 0xb1; break; /* SUPERSCRIPT ONE */
+			case 0xba: new_str[i] = 0xb0; break; /* MASCULINE ORDINAL INDICATOR */
+			case 0xbc: new_str[i] = 0xbc; break; /* VULGAR FRACTION ONE QUARTER */
+			case 0xbd: new_str[i] = 0xbd; break; /* VULGAR FRACTION ONE HALF */
+			case 0xbe: new_str[i] = 0xbe; break; /* VULGAR FRACTION THREE QUARTERS */
+			case 0xbf: new_str[i] = 0xb9; break; /* INVERTED QUESTION MARK */
+			default: new_str[i] = ' '; break;
+			}
+			break;
+
+		case 0xc3:
+			str++;
+			switch (*str) {
+			case 0x80: new_str[i] = 0xc1; break; /* LATIN CAPITAL LETTER A WITH GRAVE */
+			case 0x81: new_str[i] = 0xc0; break; /* LATIN CAPITAL LETTER A WITH ACUTE */
+			case 0x82: new_str[i] = 0xd0; break; /* LATIN CAPITAL LETTER A WITH CIRCUMFLEX */
+			case 0x83: new_str[i] = 0xe0; break; /* LATIN CAPITAL LETTER A WITH TILDE */
+			case 0x84: new_str[i] = 0xd1; break; /* LATIN CAPITAL LETTER A WITH DIAERESIS */
+			case 0x85: new_str[i] = 0xe1; break; /* LATIN CAPITAL LETTER A WITH RING ABOVE */
+			case 0x86: new_str[i] = 0xe2; break; /* LATIN CAPITAL LETTER AE */
+			case 0x87: new_str[i] = 0x8b; break; /* LATIN CAPITAL LETTER C WITH CEDILLA */
+			case 0x88: new_str[i] = 0xc3; break; /* LATIN CAPITAL LETTER E WITH GRAVE */
+			case 0x89: new_str[i] = 0xc2; break; /* LATIN CAPITAL LETTER E WITH ACUTE */
+			case 0x8a: new_str[i] = 0xd2; break; /* LATIN CAPITAL LETTER E WITH CIRCUMFLEX */
+			case 0x8b: new_str[i] = 0xd3; break; /* LATIN CAPITAL LETTER E WITH DIAERESIS */
+			case 0x8c: new_str[i] = 0xc5; break; /* LATIN CAPITAL LETTER I WITH GRAVE */
+			case 0x8d: new_str[i] = 0xc4; break; /* LATIN CAPITAL LETTER I WITH ACUTE */
+			case 0x8e: new_str[i] = 0xd4; break; /* LATIN CAPITAL LETTER I WITH CIRCUMFLEX */
+			case 0x8f: new_str[i] = 0xd5; break; /* LATIN CAPITAL LETTER I WITH DIAERESIS */
+			case 0x90: new_str[i] = 0xce; break; /* LATIN CAPITAL LETTER ETH */
+			case 0x91: new_str[i] = 0x8a; break; /* LATIN CAPITAL LETTER N WITH TILDE */
+			case 0x92: new_str[i] = 0xc7; break; /* LATIN CAPITAL LETTER O WITH GRAVE */
+			case 0x93: new_str[i] = 0xc6; break; /* LATIN CAPITAL LETTER O WITH ACUTE */
+			case 0x94: new_str[i] = 0xd6; break; /* LATIN CAPITAL LETTER O WITH CIRCUMFLEX */
+			case 0x95: new_str[i] = 0xe6; break; /* LATIN CAPITAL LETTER O WITH TILDE */
+			case 0x96: new_str[i] = 0xd7; break; /* LATIN CAPITAL LETTER O WITH DIAERESIS */
+			case 0x98: new_str[i] = 0xe7; break; /* LATIN CAPITAL LETTER O WITH STROKE */
+			case 0x99: new_str[i] = 0xc9; break; /* LATIN CAPITAL LETTER U WITH GRAVE */
+			case 0x9a: new_str[i] = 0xc8; break; /* LATIN CAPITAL LETTER U WITH ACUTE */
+			case 0x9b: new_str[i] = 0xd8; break; /* LATIN CAPITAL LETTER U WITH CIRCUMFLEX */
+			case 0x9c: new_str[i] = 0xd9; break; /* LATIN CAPITAL LETTER U WITH DIAERESIS */
+			case 0x9d: new_str[i] = 0xe5; break; /* LATIN CAPITAL LETTER Y WITH ACUTE */
+			case 0x9e: new_str[i] = 0xe8; break; /* LATIN CAPITAL LETTER THORN */
+			case 0xa0: new_str[i] = 0x81; break; /* LATIN SMALL LETTER A WITH GRAVE */
+			case 0xa1: new_str[i] = 0x80; break; /* LATIN SMALL LETTER A WITH ACUTE */
+			case 0xa2: new_str[i] = 0x90; break; /* LATIN SMALL LETTER A WITH CIRCUMFLEX */
+			case 0xa3: new_str[i] = 0xf0; break; /* LATIN SMALL LETTER A WITH TILDE */
+			case 0xa4: new_str[i] = 0x91; break; /* LATIN SMALL LETTER A WITH DIAERESIS */
+			case 0xa5: new_str[i] = 0xf1; break; /* LATIN SMALL LETTER A WITH RING ABOVE */
+			case 0xa6: new_str[i] = 0xf2; break; /* LATIN SMALL LETTER AE */
+			case 0xa7: new_str[i] = 0x9b; break; /* LATIN SMALL LETTER C WITH CEDILLA */
+			case 0xa8: new_str[i] = 0x83; break; /* LATIN SMALL LETTER E WITH GRAVE */
+			case 0xa9: new_str[i] = 0x82; break; /* LATIN SMALL LETTER E WITH ACUTE */
+			case 0xaa: new_str[i] = 0x92; break; /* LATIN SMALL LETTER E WITH CIRCUMFLEX */
+			case 0xab: new_str[i] = 0x93; break; /* LATIN SMALL LETTER E WITH DIAERESIS */
+			case 0xac: new_str[i] = 0x85; break; /* LATIN SMALL LETTER I WITH GRAVE */
+			case 0xad: new_str[i] = 0x84; break; /* LATIN SMALL LETTER I WITH ACUTE */
+			case 0xae: new_str[i] = 0x94; break; /* LATIN SMALL LETTER I WITH CIRCUMFLEX */
+			case 0xaf: new_str[i] = 0x95; break; /* LATIN SMALL LETTER I WITH DIAERESIS */
+			case 0xb0: new_str[i] = 0xef; break; /* LATIN SMALL LETTER ETH */
+			case 0xb1: new_str[i] = 0x9a; break; /* LATIN SMALL LETTER N WITH TILDE */
+			case 0xb2: new_str[i] = 0x87; break; /* LATIN SMALL LETTER O WITH GRAVE */
+			case 0xb3: new_str[i] = 0x86; break; /* LATIN SMALL LETTER O WITH ACUTE */
+			case 0xb4: new_str[i] = 0x96; break; /* LATIN SMALL LETTER O WITH CIRCUMFLEX */
+			case 0xb5: new_str[i] = 0xf6; break; /* LATIN SMALL LETTER O WITH TILDE */
+			case 0xb6: new_str[i] = 0x97; break; /* LATIN SMALL LETTER O WITH DIAERESIS */
+			case 0xb7: new_str[i] = 0xba; break; /* DIVISION SIGN */
+			case 0xb8: new_str[i] = 0xf7; break; /* LATIN SMALL LETTER O WITH STROKE */
+			case 0xb9: new_str[i] = 0x89; break; /* LATIN SMALL LETTER U WITH GRAVE */
+			case 0xba: new_str[i] = 0x88; break; /* LATIN SMALL LETTER U WITH ACUTE */
+			case 0xbb: new_str[i] = 0x98; break; /* LATIN SMALL LETTER U WITH CIRCUMFLEX */
+			case 0xbc: new_str[i] = 0x99; break; /* LATIN SMALL LETTER U WITH DIAERESIS */
+			case 0xbd: new_str[i] = 0xf5; break; /* LATIN SMALL LETTER Y WITH ACUTE */
+			case 0xbe: new_str[i] = 0xf8; break; /* LATIN SMALL LETTER THORN */
+			default: new_str[i] = ' '; break;
+			}
+			break;
+
+		case 0xc4:
+			str++;
+			switch (*str) {
+			case 0x87: new_str[i] = 0xfb; break; /* LATIN SMALL LETTER C WITH ACUTE */
+			case 0x8c: new_str[i] = 0xcb; break; /* LATIN CAPITAL LETTER C WITH CARON */
+			case 0x8d: new_str[i] = 0xdb; break; /* LATIN SMALL LETTER C WITH CARON */
+			case 0x91: new_str[i] = 0xde; break; /* LATIN SMALL LETTER D WITH STROKE */
+			case 0x9b: new_str[i] = 0xa5; break; /* LATIN SMALL LETTER E WITH CARON */
+			case 0xb0: new_str[i] = 0xb5; break; /* LATIN CAPITAL LETTER I WITH DOT ABOVE */
+			case 0xb1: new_str[i] = 0x9f; break; /* LATIN SMALL LETTER DOTLESS I */
+			case 0xb2: new_str[i] = 0x8f; break; /* LATIN CAPITAL LIGATURE IJ */
+			case 0xb3: new_str[i] = 0x9f; break; /* LATIN SMALL LIGATURE IJ */
+			case 0xbf: new_str[i] = 0xcf; break; /* LATIN CAPITAL LETTER L WITH MIDDLE DOT */
+			default: new_str[i] = ' '; break;
+			}
+			break;
+
+		case 0xc5:
+			str++;
+			switch (*str) {
+			case 0x80: new_str[i] = 0xdf; break; /* LATIN SMALL LETTER L WITH MIDDLE DOT */
+			case 0x84: new_str[i] = 0xb6; break; /* LATIN SMALL LETTER N WITH ACUTE */
+			case 0x88: new_str[i] = 0xa6; break; /* LATIN SMALL LETTER N WITH CARON */
+			case 0x8a: new_str[i] = 0xe9; break; /* LATIN CAPITAL LETTER ENG */
+			case 0x8b: new_str[i] = 0xf9; break; /* LATIN SMALL LETTER ENG */
+			case 0x91: new_str[i] = 0xa7; break; /* LATIN SMALL LETTER O WITH DOUBLE ACUTE */
+			case 0x92: new_str[i] = 0xe3; break; /* LATIN CAPITAL LIGATURE OE */
+			case 0x93: new_str[i] = 0xf3; break; /* LATIN SMALL LIGATURE OE */
+			case 0x94: new_str[i] = 0xea; break; /* LATIN CAPITAL LETTER R WITH ACUTE */
+			case 0x95: new_str[i] = 0xfa; break; /* LATIN SMALL LETTER R WITH ACUTE */
+			case 0x98: new_str[i] = 0xca; break; /* LATIN CAPITAL LETTER R WITH CARON */
+			case 0x99: new_str[i] = 0xda; break; /* LATIN SMALL LETTER R WITH CARON */
+			case 0x9a: new_str[i] = 0xec; break; /* LATIN CAPITAL LETTER S WITH ACUTE */
+			case 0x9b: new_str[i] = 0xfc; break; /* LATIN SMALL LETTER S WITH ACUTE */
+			case 0x9e: new_str[i] = 0x8c; break; /* LATIN CAPITAL LETTER S WITH CEDILLA */
+			case 0x9f: new_str[i] = 0x9c; break; /* LATIN SMALL LETTER S WITH CEDILLA */
+			case 0xa0: new_str[i] = 0xcc; break; /* LATIN CAPITAL LETTER S WITH CARON */
+			case 0xa1: new_str[i] = 0xdc; break; /* LATIN SMALL LETTER S WITH CARON */
+			case 0xa6: new_str[i] = 0xee; break; /* LATIN CAPITAL LETTER T WITH STROKE */
+			case 0xa7: new_str[i] = 0xfe; break; /* LATIN SMALL LETTER T WITH STROKE */
+			case 0xb1: new_str[i] = 0xb7; break; /* LATIN SMALL LETTER U WITH DOUBLE ACUTE */
+			case 0xb5: new_str[i] = 0xf4; break; /* LATIN SMALL LETTER W WITH CIRCUMFLEX */
+			case 0xb7: new_str[i] = 0xe4; break; /* LATIN SMALL LETTER Y WITH CIRCUMFLEX */
+			case 0xb9: new_str[i] = 0xed; break; /* LATIN CAPITAL LETTER Z WITH ACUTE */
+			case 0xba: new_str[i] = 0xfd; break; /* LATIN SMALL LETTER Z WITH ACUTE */
+			case 0xbd: new_str[i] = 0xcd; break; /* LATIN CAPITAL LETTER Z WITH CARON */
+			case 0xbe: new_str[i] = 0xdd; break; /* LATIN SMALL LETTER Z WITH CARON */
+			default: new_str[i] = ' '; break;
+			}
+			break;
+
+		case 0xc7:
+			str++;
+			switch (*str) {
+			case 0xa6: new_str[i] = 0xa4; break; /* LATIN CAPITAL LETTER G WITH CARON */
+			case 0xa7: new_str[i] = 0x9d; break; /* LATIN SMALL LETTER G WITH CARON */
+			default: new_str[i] = ' '; break;
+			}
+			break;
+
+		case 0xce:
+			str++;
+			switch (*str) {
+			case 0xb1: new_str[i] = 0xa1; break; /* GREEK SMALL LETTER ALPHA */
+			case 0xb2: new_str[i] = 0x8d; break; /* GREEK SMALL LETTER BETA */
+			default: new_str[i] = ' '; break;
+			}
+			break;
+
+		case 0xcf:
+			str++;
+			switch (*str) {
+			case 0x80: new_str[i] = 0xa8; break; /* GREEK SMALL LETTER PI */
+			default: new_str[i] = ' '; break;
+			}
+			break;
+
+		default: /* 0-127 or unknown */
+			switch (*str) {
+			case '$': new_str[i] = 0xab; break; /* DOLLAR SIGN */
+			default: new_str[i] = *str; break;
+			}
+			break;
+		}
+
+		i++;
+		str++;
+	}
+
+	new_str[i] = 0;
+	return new_str;
+}

src/lib.h

@@ -0,0 +1,34 @@
+/*
+ * mpxgen - FM multiplex encoder with Stereo and RDS
+ * Copyright (C) 2021 Anthony96922
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+extern void msleep(unsigned long ms);
+
+extern size_t _strnlen(const char *s, size_t maxlen);
+extern int ustrcmp(const unsigned char *s1, const unsigned char *s2);
+
+extern uint8_t get_rtp_tag_id(char *rtp_tag_name);
+extern char *get_rtp_tag_name(uint8_t rtp_tag);
+#ifdef RDS2
+extern void add_checkwords(uint16_t *blocks, uint8_t *bits, bool rds2);
+#else
+extern void add_checkwords(uint16_t *blocks, uint8_t *bits);
+#endif
+extern uint8_t add_rds_af(struct rds_af_t *af_list, float freq);
+extern char *show_af_list(struct rds_af_t af_list);
+extern uint16_t crc16(uint8_t *data, size_t len);
+extern unsigned char *xlat(unsigned char *str);

src/make-station-logo.sh

@@ -0,0 +1,15 @@
+#!/bin/bash
+
+# Create station logo data to build into the mpxgen executable for RDS2
+
+if [ -z "$1" ]; then
+  echo "Usage: $0 <logo file>"
+  exit
+fi
+
+if [ -f "$1" ]; then
+  echo 'static const unsigned char station_logo[] = {' > rds2_image_data.c
+  xxd -i < "$1" >> rds2_image_data.c
+  echo '};' >> rds2_image_data.c
+  echo 'static const unsigned int station_logo_len = sizeof(station_logo);' >> rds2_image_data.c
+fi

src/minirds.c

@@ -0,0 +1,354 @@
+/*
+ * mpxgen - FM multiplex encoder with Stereo and RDS
+ * Copyright (C) 2019 Anthony96922
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "common.h"
+#include <signal.h>
+#include <getopt.h>
+#include <pthread.h>
+#include <pulse/simple.h>
+
+#include "rds.h"
+#include "fm_mpx.h"
+#include "control_pipe.h"
+#include "resampler.h"
+#include "lib.h"
+#include "ascii_cmd.h"
+
+static uint8_t stop_rds;
+
+static void stop() {
+	printf("Received an stopping signal\n");
+	stop_rds = 1;
+}
+
+static inline void float2char2channel(
+    float *inbuf, char *outbuf, size_t frames) {
+    uint16_t j = 0, k = 0;
+    
+    for (uint16_t i = 0; i < frames; i++) {
+        int16_t sample = lroundf(inbuf[j++] * 16383.5f);
+        
+        // Direct memory write is more efficient for byte conversion
+        outbuf[k++] = sample & 0xFF;
+        outbuf[k++] = (sample >> 8) & 0xFF;
+    }
+}
+
+/* threads */
+static void *control_pipe_worker() {
+	while (!stop_rds) {
+		poll_control_pipe();
+		msleep(READ_TIMEOUT_MS);
+	}
+
+	close_control_pipe();
+	pthread_exit(NULL);
+}
+
+static void show_help(char *name) {
+	printf(
+		"This is MiniRDS, a lightweight RDS encoder.\n"
+		"Version %f\n"
+		"\n"
+		"Usage: %s [options]\n"
+		"\n"
+		"    -i,--pi           Program Identification code\n"
+		"                        [default: 3073]\n"
+		"    -s,--ps           Program Service name\n"
+		"                        [default: \"radio95\"]\n"
+		"    -r,--rt1           Radio Text 1\n"
+		"                        [default: (nothing)]\n"
+		"    -p,--pty          Program Type\n"
+		"                        [default: 0]\n"
+		"    -T,--tp           Traffic Program\n"
+		"                        [default: 0]\n"
+		"    -A,--af           Alternative Frequency (FM/LF/MF)\n"
+		"                        (more than one AF may be passed)\n"
+		"    -P,--ptyn         Program Type Name\n"
+		"    -l,--lps          Long PS\n"
+		"    -e,--ecc          ECC code\n"
+		"    -d,--di           DI code\n"
+		"    -C,--ctl          FIFO control pipe\n"
+		#ifdef RDS2
+		"    -I,--img          RDS2 Logo path\n"
+		#endif
+		"    -h,--help         Show this help text and exit\n"
+		"    -v,--version      Show version and exit\n"
+		"\n",
+		VERSION,
+		name
+	);
+}
+
+static void show_version() {
+	printf("MiniRDS version (radio95 Edit) %f\n", VERSION);
+}
+
+int main(int argc, char **argv) {
+	int opt;
+	char control_pipe[51];
+	struct rds_params_t rds_params = {
+		.ps = "radio95",
+		.rt1 = "",
+		.pi = 0x305F,
+		.ecc = 0xE2,
+		.lps = "radio95 - Radio Nowotomyskie"
+	};
+	float volume = 100.0f;
+
+	/* buffers */
+	float *mpx_buffer;
+	float *out_buffer;
+	char *dev_out;
+
+	int8_t r;
+	size_t frames;
+
+	/* SRC */
+	SRC_STATE *src_state;
+	SRC_DATA src_data;
+
+	/* PASIMPLE */
+	pa_simple *device;
+	pa_sample_spec format;
+
+	/* pthread */
+	pthread_attr_t attr;
+	pthread_t control_pipe_thread;
+	pthread_mutex_t control_pipe_mutex = PTHREAD_MUTEX_INITIALIZER;
+	pthread_cond_t control_pipe_cond;
+
+	const char	*short_opt = "R:i:s:r:p:T:A:P:l:e:L:d:C:"
+	#ifdef RDS2
+	"I:"
+	#endif
+	"hv";
+
+	struct option	long_opt[] =
+	{
+		{"rds",		required_argument, NULL, 'R'},
+		{"pi",		required_argument, NULL, 'i'},
+		{"ps",		required_argument, NULL, 's'},
+		{"rt1",		required_argument, NULL, 'r'},
+		{"pty",		required_argument, NULL, 'p'},
+		{"tp",		required_argument, NULL, 'T'},
+		{"af",		required_argument, NULL, 'A'},
+		{"ptyn",	required_argument, NULL, 'P'},
+		{"lps",    	required_argument, NULL, 'l'},
+		{"ecc",    	required_argument, NULL, 'e'},
+		{"lic",    	required_argument, NULL, 'L'},
+		{"di",    	required_argument, NULL, 'd'},
+		{"ctl",		required_argument, NULL, 'C'},
+		#ifdef RDS2
+		{"img",		required_argument, NULL, 'I'},
+		#endif
+
+		{"help",	no_argument, NULL, 'h'},
+		{"version",	no_argument, NULL, 'v'},
+		{ 0,		0,		0,	0 }
+	};
+
+	memset(control_pipe, 0, 51);
+
+keep_parsing_opts:
+
+	opt = getopt_long(argc, argv, short_opt, long_opt, NULL);
+	if (opt == -1) goto done_parsing_opts;
+
+	switch (opt) {
+		case 'i': /* pi */
+			rds_params.pi = strtoul(optarg, NULL, 16);
+			break;
+
+		case 's': /* ps */
+			memcpy(rds_params.ps, xlat((unsigned char *)optarg), PS_LENGTH);
+			break;
+
+		case 'r': /* rt1 */
+			memcpy(rds_params.rt1, xlat((unsigned char *)optarg), RT_LENGTH);
+			break;
+
+		case 'p': /* pty */
+			rds_params.pty = strtoul(optarg, NULL, 10);
+			break;
+
+		case 'T': /* tp */
+			rds_params.tp = strtoul(optarg, NULL, 10);
+			break;
+
+		case 'A': /* af */
+			if (add_rds_af(&rds_params.af, strtof(optarg, NULL)) == 1) return 1;
+			break;
+
+		case 'P': /* ptyn */
+			memcpy(rds_params.ptyn, xlat((unsigned char *)optarg), PTYN_LENGTH);
+			break;
+
+		case 'l': /* lps */
+			memcpy(rds_params.lps, (unsigned char *)optarg, LPS_LENGTH);
+			break;
+
+		case 'e': /* ecc */
+			rds_params.ecc = strtoul(optarg, NULL, 16);
+			break;
+
+		case 'L': /* lic */
+			rds_params.lic = strtoul(optarg, NULL, 16);
+			break;
+
+		case 'C': /* ctl */
+			memcpy(control_pipe, optarg, 50);
+			break;
+
+		#ifdef RDS2
+		case 'I': /* img */
+			memcpy(rds_params.rds2_image_path, optarg, 50);
+			break;
+		#endif
+
+		case 'v': /* version */
+			show_version();
+			return 0;
+
+		case 'h': /* help */
+		case '?':
+		default:
+			show_help(argv[0]);
+			return 1;
+	}
+
+	goto keep_parsing_opts;
+
+done_parsing_opts:
+
+	/* Initialize pthread stuff */
+	pthread_mutex_init(&control_pipe_mutex, NULL);
+	pthread_cond_init(&control_pipe_cond, NULL);
+	pthread_attr_init(&attr);
+
+	/* Setup buffers */
+	mpx_buffer = malloc(NUM_MPX_FRAMES_IN * 2 * sizeof(float));
+	out_buffer = malloc(NUM_MPX_FRAMES_OUT * 2 * sizeof(float));
+	dev_out = malloc(NUM_MPX_FRAMES_OUT * 2 * sizeof(int16_t) * sizeof(char));
+
+	/* Gracefully stop the encoder on SIGINT or SIGTERM */
+	signal(SIGINT, stop);
+	signal(SIGTERM, stop);
+
+	/* Initialize the baseband generator */
+	fm_mpx_init(MPX_SAMPLE_RATE);
+	set_output_volume(volume);
+
+	/* Initialize the RDS modulator */
+	init_rds_encoder(rds_params);
+
+	/* PASIMPLE format */
+	format.format = PA_SAMPLE_S16LE;
+	format.channels = 1;
+	format.rate = OUTPUT_SAMPLE_RATE;
+
+	device = pa_simple_new(
+		NULL,                       // Default PulseAudio server
+		"MiniRDS",                 // Application name
+		PA_STREAM_PLAYBACK,        // Direction (playback)
+		"RDS",                       // Default device
+		"RDS Generator",           // Stream description
+		&format,                   // Sample format
+		NULL,                       // Default channel map
+		NULL,                       // Default buffering attributes
+		NULL                     // Error variable
+	);
+	if (device == NULL) {
+		fprintf(stderr, "Error: cannot open sound device.\n");
+		goto exit;
+	}
+
+	/* SRC out (MPX -> output) */
+	memset(&src_data, 0, sizeof(SRC_DATA));
+	src_data.input_frames = NUM_MPX_FRAMES_IN;
+	src_data.output_frames = NUM_MPX_FRAMES_OUT;
+	src_data.src_ratio =
+		(double)OUTPUT_SAMPLE_RATE / (double)MPX_SAMPLE_RATE;
+	src_data.data_in = mpx_buffer;
+	src_data.data_out = out_buffer;
+
+	r = resampler_init(&src_state, 1);
+	if (r < 0) {
+		fprintf(stderr, "Could not create output resampler.\n");
+		goto exit;
+	}
+
+	/* Initialize the control pipe reader */
+	if (control_pipe[0]) {
+		if (open_control_pipe(control_pipe) == 0) {
+			fprintf(stderr, "Reading control commands on %s.\n", control_pipe);
+			/* Create control pipe polling worker */
+			r = pthread_create(&control_pipe_thread, &attr, control_pipe_worker, NULL);
+			if (r < 0) {
+				fprintf(stderr, "Could not create control pipe thread.\n");
+				control_pipe[0] = 0;
+				goto exit;
+			} else {
+				fprintf(stderr, "Created control pipe thread.\n");
+			}
+		} else {
+			fprintf(stderr, "Failed to open control pipe: %s.\n", control_pipe);
+			control_pipe[0] = 0;
+		}
+	}
+
+	for (;;) {
+		fm_rds_get_frames(mpx_buffer, NUM_MPX_FRAMES_IN);
+
+		if (resample(src_state, src_data, &frames) < 0) break;
+
+		float2char2channel(out_buffer, dev_out, frames);
+
+		/* num_bytes = audio frames( * channels) * bytes per sample */
+		if (pa_simple_write(device, dev_out, frames * sizeof(int16_t), NULL) != 0) {
+			fprintf(stderr, "Error: could not play audio.\n");
+			break;
+		}
+
+		if (stop_rds) {
+			fprintf(stderr, "Stopping the loop...\n");
+			break;
+		}
+	}
+
+	resampler_exit(src_state);
+
+exit:
+	if (control_pipe[0]) {
+		/* shut down threads */
+		fprintf(stderr, "Waiting for pipe thread to shut down.\n");
+		pthread_cond_signal(&control_pipe_cond);
+		pthread_join(control_pipe_thread, NULL);
+	}
+
+	pthread_attr_destroy(&attr);
+	pa_simple_free(device);
+	fm_mpx_exit();
+	exit_rds_encoder();
+
+	free(mpx_buffer);
+	free(out_buffer);
+	free(dev_out);
+
+	return 0;
+}

src/modulator.c

@@ -0,0 +1,202 @@
+/*
+ * mpxgen - FM multiplex encoder with Stereo and RDS
+ * Copyright (C) 2021 Anthony96922
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "common.h"
+#include "rds.h"
+#ifdef RDS2
+#include "rds2.h"
+#endif
+#include "fm_mpx.h"
+#include "waveforms.h"
+#include "modulator.h"
+
+static struct rds_t **rds_ctx;
+static float **waveform;
+
+/*
+ * Create the RDS objects
+ *
+ */
+void init_rds_objects() {
+	rds_ctx = malloc(NUM_STREAMS * sizeof(struct rds_t));
+
+	for (uint8_t i = 0; i < NUM_STREAMS; i++) {
+		rds_ctx[i] = malloc(sizeof(struct rds_t));
+		rds_ctx[i]->bit_buffer = malloc(BITS_PER_GROUP);
+		rds_ctx[i]->sample_buffer =
+			malloc(SAMPLE_BUFFER_SIZE * sizeof(float));
+
+#ifdef RDS2_SYMBOL_SHIFTING
+		/*
+		 * symbol shifting to reduce total power of aggregate carriers
+		 *
+		 * see:
+		 * https://ietresearch.onlinelibrary.wiley.com/doi/pdf/10.1049/el.2019.0292
+		 * for more information
+		 */
+		switch (i) {
+		case 1:
+			/* time offset of 1/2 */
+			rds_ctx[i]->symbol_shift = SAMPLES_PER_BIT / 2;
+			rds_ctx[i]->symbol_shift_buf = malloc(
+				rds_ctx[i]->symbol_shift * sizeof(float));
+			memset(rds_ctx[i]->symbol_shift_buf, 0,
+				rds_ctx[i]->symbol_shift * sizeof(float));
+			break;
+		case 2:
+			/* time offset of 1/4 */
+			rds_ctx[i]->symbol_shift = SAMPLES_PER_BIT / 4;
+			rds_ctx[i]->symbol_shift_buf = malloc(
+				rds_ctx[i]->symbol_shift * sizeof(float));
+			memset(rds_ctx[i]->symbol_shift_buf, 0,
+				rds_ctx[i]->symbol_shift * sizeof(float));
+			break;
+		case 3:
+			/* time offset of 3/4 */
+			rds_ctx[i]->symbol_shift = (SAMPLES_PER_BIT / 4) * 3;
+			rds_ctx[i]->symbol_shift_buf = malloc(
+				rds_ctx[i]->symbol_shift * sizeof(float));
+			memset(rds_ctx[i]->symbol_shift_buf, 0,
+				rds_ctx[i]->symbol_shift * sizeof(float));
+			break;
+		default: /* stream 0 */
+			/* no time offset */
+			rds_ctx[i]->symbol_shift = 0;
+			break;
+		}
+#endif
+		rds_ctx[i]->symbol_shift_buf_idx = 0;
+
+	}
+
+	waveform = malloc(2 * sizeof(float));
+
+	for (uint8_t i = 0; i < 2; i++) {
+		waveform[i] = malloc(FILTER_SIZE * sizeof(float));
+		for (uint16_t j = 0; j < FILTER_SIZE; j++) {
+			waveform[i][j] = i ?
+				+waveform_biphase[j] : -waveform_biphase[j];
+		}
+	}
+}
+
+void exit_rds_objects() {
+    for (uint8_t i = 0; i < NUM_STREAMS; i++) {
+        int has_symbol_shift = rds_ctx[i]->symbol_shift;
+        if (has_symbol_shift) {
+            free(rds_ctx[i]->symbol_shift_buf);
+        }
+        free(rds_ctx[i]->sample_buffer);
+        free(rds_ctx[i]->bit_buffer);
+        free(rds_ctx[i]);
+    }
+	free(rds_ctx);
+
+	for (uint8_t i = 0; i < 2; i++) {
+		free(waveform[i]);
+	}
+
+	free(waveform);
+}
+
+/* Get an RDS sample. This generates the envelope of the waveform using
+ * pre-generated elementary waveform samples.
+ */
+#ifdef RDS2
+float get_rds_sample(uint8_t stream_num, uint8_t rds2tunneling) {
+#else
+float get_rds_sample(uint8_t stream_num) {
+#endif
+	struct rds_t *rds;
+	uint16_t idx;
+	float *cur_waveform;
+	float sample;
+
+	/* select context */
+	rds = rds_ctx[stream_num];
+
+	if (rds->sample_count == SAMPLES_PER_BIT) {
+		if (rds->bit_pos == BITS_PER_GROUP) {
+#ifdef RDS2
+			if(!rds2tunneling) {
+				if (stream_num > 0) {
+					get_rds2_bits(stream_num, rds->bit_buffer);
+				} else {
+					get_rds_bits(rds->bit_buffer);
+				}
+			} else {
+				get_rds_bits(rds->bit_buffer);
+			}
+#else
+			get_rds_bits(rds->bit_buffer);
+#endif
+			rds->bit_pos = 0;
+		}
+
+                /* do differential encoding */
+                rds->cur_bit = rds->bit_buffer[rds->bit_pos++];
+                rds->prev_output = rds->cur_output;
+                rds->cur_output = rds->prev_output ^ rds->cur_bit;
+
+                idx = rds->in_sample_index;
+                cur_waveform = waveform[rds->cur_output];
+
+    uint16_t buffer_remaining = SAMPLE_BUFFER_SIZE - idx;
+    if (buffer_remaining >= FILTER_SIZE) {
+        // Process continuous chunk
+        for (uint16_t i = 0; i < FILTER_SIZE; i++) {
+            rds->sample_buffer[idx + i] += cur_waveform[i];
+        }
+        idx += FILTER_SIZE;
+    } else {
+        // Process in two parts to handle wrapping
+        for (uint16_t i = 0; i < buffer_remaining; i++) {
+            rds->sample_buffer[idx + i] += cur_waveform[i];
+        }
+        for (uint16_t i = 0; i < FILTER_SIZE - buffer_remaining; i++) {
+            rds->sample_buffer[i] += cur_waveform[buffer_remaining + i];
+        }
+        idx = FILTER_SIZE - buffer_remaining;
+    }
+                rds->in_sample_index += SAMPLES_PER_BIT;
+                if (rds->in_sample_index == SAMPLE_BUFFER_SIZE)
+                        rds->in_sample_index = 0;
+
+                rds->sample_count = 0;
+        }
+        rds->sample_count++;
+
+        if (rds->symbol_shift) {
+                rds->symbol_shift_buf[rds->symbol_shift_buf_idx++] =
+                        rds->sample_buffer[rds->out_sample_index];
+
+                if (rds->symbol_shift_buf_idx == rds->symbol_shift)
+                        rds->symbol_shift_buf_idx = 0;
+
+                sample = rds->symbol_shift_buf[rds->symbol_shift_buf_idx];
+
+                goto done;
+        }
+
+        sample = rds->sample_buffer[rds->out_sample_index];
+done:
+        rds->sample_buffer[rds->out_sample_index++] = 0;
+        if (rds->out_sample_index == SAMPLE_BUFFER_SIZE)
+                rds->out_sample_index = 0;
+        return sample;
+}

src/modulator.h

@@ -0,0 +1,43 @@
+/*
+ * mpxgen - FM multiplex encoder with Stereo and RDS
+ * Copyright (C) 2021 Anthony96922
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifdef RDS2
+#define NUM_STREAMS	4
+#else
+#define NUM_STREAMS	1
+#endif
+
+/* RDS signal context */
+typedef struct rds_t {
+	uint8_t *bit_buffer; /* BITS_PER_GROUP */
+	uint8_t bit_pos;
+	float *sample_buffer; /* SAMPLE_BUFFER_SIZE */
+	uint8_t prev_output;
+	uint8_t cur_output;
+	uint8_t cur_bit;
+	uint8_t sample_count;
+	uint16_t in_sample_index;
+	uint16_t out_sample_index;
+	uint8_t symbol_shift;
+	float *symbol_shift_buf;
+	uint8_t symbol_shift_buf_idx;
+} rds_t;
+
+extern void init_rds_objects();
+extern void exit_rds_objects();
+

src/osc.c

@@ -0,0 +1,108 @@
+/*
+ * mpxgen - FM multiplex encoder with Stereo and RDS
+ * Copyright (C) 2019 Anthony96922
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "common.h"
+#include "osc.h"
+
+/*
+ * Code for MPX oscillator
+ *
+ * This uses lookup tables to speed up the waveform generation
+ *
+ */
+
+/*
+ * DDS function generator
+ *
+ * Create wave constants for a given frequency
+ */
+static void create_wave(uint32_t rate, float freq,
+		float *sin_wave, float *cos_wave, uint16_t *max_phase) {
+	double sin_sample, cos_sample;
+	/* used to determine if we have completed a cycle */
+	uint16_t periods = round((double)rate/freq);
+	const double w = M_2PI * freq / rate;
+
+	/* First value of a sine wave is always 0 */
+	*sin_wave++ = 0.0f;
+	*cos_wave++ = 1.0f;
+
+	for(uint16_t i = 1; i < periods; i++) {
+		sin_sample = sin(w * i);
+		cos_sample = cos(w * i);
+		*sin_wave++ = (float)sin_sample;
+		*cos_wave++ = (float)cos_sample;
+	}
+
+	*max_phase = periods;
+}
+
+/*
+ * Oscillator object initialization
+ *
+ */
+void osc_init(struct osc_t *osc, uint32_t sample_rate, float freq) {
+
+	/* sample rate for the objects */
+	osc->sample_rate = sample_rate;
+
+	/* waveform tables */
+	osc->sin_wave = malloc(osc->sample_rate * sizeof(float));
+	osc->cos_wave = malloc(osc->sample_rate * sizeof(float));
+
+	/* set current position to 0 */
+	osc->cur = 0;
+
+	/* create waveform data and load into lookup tables */
+	create_wave(osc->sample_rate, freq,
+		osc->sin_wave, osc->cos_wave,
+		&osc->max);
+}
+
+/*
+ * Get a single waveform sample
+ *
+ * Cosine is needed for SSB generation
+ *
+ */
+float osc_get_cos(struct osc_t *osc) {
+	return osc->cos_wave[osc->cur];
+}
+
+float osc_get_sin(struct osc_t *osc) {
+	return osc->sin_wave[osc->cur];
+}
+
+/*
+ * Shift the oscillator to the next position
+ *
+ */
+void osc_update_pos(struct osc_t *osc) {
+	if (++osc->cur == osc->max) osc->cur = 0;
+}
+
+/*
+ * Unload waveform tables
+ *
+ */
+void osc_exit(struct osc_t *osc) {
+	free(osc->sin_wave);
+	free(osc->cos_wave);
+	osc->cur = 0;
+	osc->max = 0;
+}

src/osc.h

@@ -0,0 +1,50 @@
+/*
+ * mpxgen - FM multiplex encoder with Stereo and RDS
+ * Copyright (C) 2019 Anthony96922
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+/* context for MPX oscillator */
+typedef struct osc_t {
+	/* the sample rate at which the oscillator operates */
+	uint32_t sample_rate;
+
+	/*
+	 * frequency for this instance
+	 *
+	 */
+	float freq;
+
+	/*
+	 * Arrays of carrier wave constants
+	 *
+	 */
+	float *sin_wave_out_of_phase;
+	float *sin_wave;
+	float *cos_wave;
+
+	/*
+	 * Wave phase
+	 *
+	 */
+	uint16_t cur;
+	uint16_t max;
+} osc_t;
+
+extern void osc_init(struct osc_t *osc, uint32_t sample_rate, const float freq);
+extern float osc_get_sin(struct osc_t *osc);
+extern float osc_get_cos(struct osc_t *osc);
+extern void osc_update_pos(struct osc_t *osc);
+extern void osc_exit(struct osc_t *osc);

src/rds.c

@@ -0,0 +1,778 @@
+/*
+ * mpxgen - FM multiplex encoder with Stereo and RDS
+ * Copyright (C) 2019 Anthony96922
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "common.h"
+#include "rds.h"
+#include "modulator.h"
+#ifdef RDS2
+#include "rds2.h"
+#endif
+#include "lib.h"
+#include <time.h>
+
+static struct rds_params_t rds_data;
+
+/* RDS data controls */
+static struct {
+	/* Slow Labeling Codes */
+	uint8_t ecclic_enabled;
+	uint8_t ecc_or_lic;
+	/* Program Item Number */
+	uint8_t pin_enabled;
+
+	/* Program Service */
+	uint8_t ps_update;
+	uint8_t tps_update;
+
+	/* Radio Text*/
+	uint8_t rt1_enabled;
+	uint8_t rt_update;
+	uint8_t rt_ab;
+	uint8_t rt_segments;
+
+	/* PTYN */
+	uint8_t ptyn_enabled;
+	uint8_t ptyn_update;
+	uint8_t ptyn_ab;
+
+	/* Long PS */
+	uint8_t lps_on;
+	uint8_t lps_update;
+	uint8_t lps_segments;
+
+	uint8_t custom_group_in;
+	uint16_t custom_group[GROUP_LENGTH];
+
+	/* TODO: add UDG */
+} rds_state;
+
+#ifdef ODA
+/* ODA */
+static struct rds_oda_t odas[MAX_ODAS];
+static struct {
+	uint8_t current;
+	uint8_t count;
+} oda_state;
+#endif
+
+#ifdef ODA_RTP
+/* RT+ */
+static struct {
+	uint8_t group;
+	uint8_t enabled;
+	uint8_t running;
+	uint8_t toggle;
+	uint8_t type[2];
+	uint8_t start[2];
+	uint8_t len[2];
+} rtplus_cfg;
+#endif
+
+#ifdef ODA
+static void register_oda(uint8_t group, uint16_t aid, uint16_t scb) {
+
+	if (oda_state.count >= MAX_ODAS) return; /* can't accept more ODAs */
+
+	odas[oda_state.count].group = group;
+	odas[oda_state.count].aid = aid;
+	odas[oda_state.count].scb = scb;
+	oda_state.count++;
+}
+#endif
+
+/* Get the next AF entry
+ */
+static uint16_t get_next_af() {
+	static uint8_t af_state;
+	uint16_t out;
+
+	if (rds_data.af.num_afs) {
+		if (af_state == 0) {
+			out = (AF_CODE_NUM_AFS_BASE + rds_data.af.num_afs) << 8;
+			out |= rds_data.af.afs[0];
+			af_state += 1;
+		} else {
+			out = rds_data.af.afs[af_state] << 8;
+			if (rds_data.af.afs[af_state + 1])
+				out |= rds_data.af.afs[af_state + 1];
+			else
+				out |= AF_CODE_FILLER;
+			af_state += 2;
+		}
+		if (af_state >= rds_data.af.num_entries) af_state = 0;
+	} else {
+		out = AF_CODE_NO_AF << 8 | AF_CODE_FILLER;
+	}
+
+	return out;
+}
+
+/* PS group (0A) */
+static void get_rds_ps_group(uint16_t *blocks) {
+	static unsigned char ps_text[PS_LENGTH];
+	static unsigned char tps_text[PS_LENGTH];
+	static uint8_t ps_csegment;
+
+	if (ps_csegment == 0 && rds_state.ps_update) {
+		memcpy(ps_text, rds_data.ps, PS_LENGTH);
+		rds_state.ps_update = 0; /* rewind */
+	}
+	if(ps_csegment == 0 && rds_state.tps_update) {
+		memcpy(tps_text, rds_data.tps, PS_LENGTH);
+		rds_state.tps_update = 0; /* rewind */
+	}
+
+	/* TA */
+	blocks[1] |= rds_data.ta << 4;
+
+	/* MS */
+	blocks[1] |= rds_data.ms << 3;
+
+	/* DI */
+	blocks[1] |= ((rds_data.di >> (3 - ps_csegment)) & INT8_0) << 2; /* DI  is a 4 bit number, we also have 4 segments, so we send a bit of the di number depending on the segment, so 0b0101 would be like: 0 1 0 1*/
+
+	/* PS segment address */
+	blocks[1] |= ps_csegment;
+
+	/* AF */
+	blocks[2] = get_next_af();
+
+	/* PS */
+	if(rds_data.ta && rds_data.traffic_ps_on) {
+		blocks[3] = tps_text[ps_csegment * 2] << 8 | tps_text[ps_csegment * 2 + 1];
+	} else {
+		/* TODO: Add DPS */
+		blocks[3] =  ps_text[ps_csegment * 2] << 8 |  ps_text[ps_csegment * 2 + 1];
+	}
+
+	ps_csegment++;
+	if (ps_csegment >= 4) ps_csegment = 0;
+}
+
+/* RT group (2A) */
+static uint8_t get_rds_rt_group(uint16_t *blocks) {
+	static unsigned char rt_text[RT_LENGTH];
+	static uint8_t rt_state;
+
+	if (rds_state.rt_update) {
+		memcpy(rt_text, rds_data.rt1, RT_LENGTH);
+		rds_state.rt_ab ^= 1;
+		rds_state.rt_update = 0;
+		rt_state = 0; /* rewind when new RT arrives */
+	}
+
+	if(rt_text[0] == '\r' || !rds_state.rt1_enabled) {
+		/* RT strings lesser than 64 in size should have been ended with a \r if a return is on [0] then that means that our string is empty and thus we can not generate this group*/
+		return 0;
+	}
+
+	blocks[1] |= 2 << 12;
+	blocks[1] |= rds_state.rt_ab << 4;
+	blocks[1] |= rt_state;
+	blocks[2] =  rt_text[rt_state * 4    ] << 8;
+	blocks[2] |= rt_text[rt_state * 4 + 1];
+	blocks[3] =  rt_text[rt_state * 4 + 2] << 8;
+	blocks[3] |= rt_text[rt_state * 4 + 3];
+
+	rt_state++;
+	if (rt_state >= rds_state.rt_segments) rt_state = 0;
+	return 1;
+}
+
+/* ODA group (3A)
+ */
+#ifdef ODA
+static void get_rds_oda_group(uint16_t *blocks) {
+	/* select ODA */
+	struct rds_oda_t this_oda = odas[oda_state.current];
+
+	#ifdef ODA_RTP
+	if(this_oda.aid == ODA_AID_RTPLUS && rtplus_cfg.enabled == 0) {
+		return;
+	}
+	#endif
+
+	blocks[1] |= 3 << 12;
+
+	blocks[1] |= GET_GROUP_TYPE(this_oda.group) << 1;
+	blocks[1] |= GET_GROUP_VER(this_oda.group);
+	blocks[2] = this_oda.scb;
+	blocks[3] = this_oda.aid;
+
+	oda_state.current++;
+	if (oda_state.current >= oda_state.count) oda_state.current = 0;
+}
+#endif
+
+static uint8_t get_rds_ct_group(uint16_t *blocks) {
+	static uint8_t latest_minutes;
+	struct tm *utc, *local_time;
+	time_t now;
+	uint8_t l;
+	uint32_t mjd;
+	int16_t offset;
+
+	/* Check time */
+	now = time(NULL);
+	utc = gmtime(&now);
+
+	if (utc->tm_min != latest_minutes) {
+		/* Generate CT group */
+		latest_minutes = utc->tm_min;
+
+		l = utc->tm_mon <= 1 ? 1 : 0;
+		mjd = 14956 + utc->tm_mday +
+			(uint32_t)((utc->tm_year - l) * 365.25f) +
+			(uint32_t)((utc->tm_mon + (1+1) + l * 12) * 30.6001f);
+
+		blocks[1] |= 4 << 12 | (mjd >> 15);
+		blocks[2] = (mjd << 1) | (utc->tm_hour >> 4);
+		blocks[3] = (utc->tm_hour & INT16_L4) << 12 | utc->tm_min << 6;
+
+		/* get local time (for the offset) */
+		local_time = localtime(&now);
+
+		/* tm_gmtoff doesn't exist in POSIX but __tm_gmtoff does */
+		offset = local_time->__tm_gmtoff / (30 * 60); /*__tm_gmtoff is time in seconds from utc, so utc + __tm_gmtoff = local time*/
+		if (offset < 0) blocks[3] |= 1 << 5; /* if less than 0 then set the flag*/
+		blocks[3] |= abs(offset); /* offset should be halfs of a hour, so offset 1 = 30 minutes, 2 = 1 hour*/
+
+		return 1;
+	}
+
+	return 0;
+}
+
+/* PTYN group (10A) */
+static void get_rds_ptyn_group(uint16_t *blocks) {
+	static unsigned char ptyn_text[PTYN_LENGTH];
+	static uint8_t ptyn_state;
+
+	if (ptyn_state == 0 && rds_state.ptyn_update) {
+		memcpy(ptyn_text, rds_data.ptyn, PTYN_LENGTH);
+		rds_state.ptyn_ab ^= 1;
+		rds_state.ptyn_update = 0;
+	}
+
+	blocks[1] |= 10 << 12 | ptyn_state;
+	blocks[1] |= rds_state.ptyn_ab << 4; /* no one knew about ptyn's ab until i saw sdr++'s decoder, it had decoded ptyn but not show it? it also did decode the ab flag */
+	blocks[2] =  ptyn_text[ptyn_state * 4 + 0] << 8;
+	blocks[2] |= ptyn_text[ptyn_state * 4 + 1];
+	blocks[3] =  ptyn_text[ptyn_state * 4 + 2] << 8;
+	blocks[3] |= ptyn_text[ptyn_state * 4 + 3];
+
+	ptyn_state++;
+	if (ptyn_state == 2) ptyn_state = 0;
+}
+
+/* Long PS group (15A) */
+static void get_rds_lps_group(uint16_t *blocks) {
+	static unsigned char lps_text[LPS_LENGTH];
+	static uint8_t lps_state;
+
+	if (lps_state == 0 && rds_state.lps_update) {
+		memcpy(lps_text, rds_data.lps, LPS_LENGTH);
+		rds_state.lps_update = 0;
+	}
+
+	blocks[1] |= 15 << 12 | lps_state;
+	/* does lps have an ab? */
+	blocks[2] =  lps_text[lps_state * 4    ] << 8;
+	blocks[2] |= lps_text[lps_state * 4 + 1];
+	blocks[3] =  lps_text[lps_state * 4 + 2] << 8;
+	blocks[3] |= lps_text[lps_state * 4 + 3];
+
+	lps_state++;
+	if (lps_state == rds_state.lps_segments) lps_state = 0;
+}
+
+static void get_rds_ecc_group(uint16_t *blocks) {
+	blocks[1] |= 1 << 12;
+	if(rds_state.ecclic_enabled) {
+		blocks[2] = rds_data.ecc;
+	}
+
+	if(rds_state.pin_enabled) {
+		blocks[3] = rds_data.pin_day << 11; /* first 5 bits */
+		blocks[3] |= rds_data.pin_hour << 6; /* 5-10 bits from start */
+		blocks[3] |= rds_data.pin_minute; /* 10-16 bits from start */
+	}
+}
+
+static void get_rds_lic_group(uint16_t *blocks) {
+	blocks[1] |= 1 << 12;
+	if(rds_state.ecclic_enabled) {
+		blocks[2] = 0x3000; /* 0b0011000000000000 first 1 bit is the linkage actuator, the 3 after are variant codes which is 3 in this case after theres space for data */
+		blocks[2] |= rds_data.lic;
+	}
+
+	if(rds_state.pin_enabled) {
+		/* pin is also in lic as it also is a 1a group*/
+		blocks[3] = rds_data.pin_day << 11;
+		blocks[3] |= rds_data.pin_hour << 6;
+		blocks[3] |= rds_data.pin_minute;
+	}
+}
+
+/* RT+ */
+#ifdef ODA_RTP
+static void init_rtplus(uint8_t group) {
+	register_oda(group, ODA_AID_RTPLUS, 0);
+	rtplus_cfg.group = group;
+	rtplus_cfg.enabled = 1;
+}
+#endif
+
+#ifdef ODA_RTP
+/* RT+ group */
+static void get_rds_rtplus_group(uint16_t *blocks) {
+	/* RT+ block format */
+	blocks[1] |= GET_GROUP_TYPE(rtplus_cfg.group) << 12;
+	blocks[1] |= GET_GROUP_VER(rtplus_cfg.group) << 11;
+	blocks[1] |= rtplus_cfg.toggle << 4 | rtplus_cfg.running << 3;
+	blocks[1] |= (rtplus_cfg.type[0] & INT8_U5) >> 3;
+
+	blocks[2] =  (rtplus_cfg.type[0] & INT8_L3) << 13;
+	blocks[2] |= (rtplus_cfg.start[0] & INT8_L6) << 7;
+	blocks[2] |= (rtplus_cfg.len[0] & INT8_L6) << 1;
+	blocks[2] |= (rtplus_cfg.type[1] & INT8_U3) >> 5;
+
+	blocks[3] =  (rtplus_cfg.type[1] & INT8_L5) << 11;
+	blocks[3] |= (rtplus_cfg.start[1] & INT8_L6) << 5;
+	blocks[3] |= rtplus_cfg.len[1] & INT8_L5;
+}
+#endif
+
+/* Lower priority groups are placed in a subsequence
+ */
+static uint8_t get_rds_other_groups(uint16_t *blocks) {
+	static uint8_t group_counter[GROUP_15B];
+
+	/* Type 1A groups */
+	if (rds_data.ecc || rds_data.lic) {
+		if (++group_counter[GROUP_1A] >= 22) {
+			group_counter[GROUP_1A] = 0;
+			if(rds_data.ecc && rds_data.lic) {
+				if(rds_state.ecc_or_lic == 0) {
+					get_rds_ecc_group(blocks);
+				} else {
+					get_rds_lic_group(blocks);
+				}
+				rds_state.ecc_or_lic ^= 1;
+			} else if(rds_data.ecc) {
+				get_rds_ecc_group(blocks);
+			} else if(rds_data.ecc) {
+				get_rds_lic_group(blocks);
+			}
+			return 1;
+		}
+	}
+
+	/* Type 3A groups */
+	#ifdef ODA
+	if (oda_state.count) {
+		if (++group_counter[GROUP_3A] >= 25) {
+			group_counter[GROUP_3A] = 0;
+			get_rds_oda_group(blocks);
+			return 1;
+		}
+	}
+	#endif
+
+	/* Type 10A groups */
+	if (rds_state.ptyn_enabled && rds_data.ptyn[0]) {
+		if (++group_counter[GROUP_10A] >= 13) {
+			group_counter[GROUP_10A] = 0;
+			/* Do not generate a 10A group if PTYN is off */
+			get_rds_ptyn_group(blocks);
+			return 1;
+		}
+	}
+
+	/* RT+ groups */
+	#ifdef ODA_RTP
+	if (++group_counter[rtplus_cfg.group] >= 30) {
+		group_counter[rtplus_cfg.group] = 0;
+		if(rtplus_cfg.enabled == 0) {
+			return 0;
+		}
+		get_rds_rtplus_group(blocks);
+		return 1;
+	}
+	#endif
+
+	return 0;
+}
+
+/*
+ * Codes a group once every 3 groups
+ * Ex: 0A, 2A, 0A, 12A, 2A, 0A, 2A, 12A, etc
+ */
+static uint8_t get_rds_long_text_groups(uint16_t *blocks) {
+	static uint8_t group_selector = 0;
+	static uint8_t group_slot_counter = 0;
+
+	/* exit early until the 4th call */
+	if (++group_slot_counter < 4)
+		return 0;
+
+	/* reset the slot counter */
+	group_slot_counter = 0;
+
+	/* 3:1 ratio */
+	switch (group_selector) {
+	case 0:
+	case 1:
+	case 2:
+	case 3: /* Long PS */
+		if (rds_data.lps[0] && rds_state.lps_on) {
+			get_rds_lps_group(blocks);
+			goto group_coded;
+		}
+		break;
+	}
+
+	/* if no group was coded */
+	if (++group_selector >= 8) group_selector = 0;
+	return 0;
+
+group_coded:
+	if (++group_selector >= 8) group_selector = 0;
+	return 1;
+}
+
+/* Get a custom group if there is one*/
+static uint8_t get_rds_custom_groups(uint16_t *blocks) {
+	if(rds_state.custom_group_in) {
+		rds_state.custom_group_in = 0;
+		blocks[0] = rds_state.custom_group[0];
+		blocks[1] = rds_state.custom_group[1];
+		blocks[2] = rds_state.custom_group[2];
+		blocks[3] = rds_state.custom_group[3];
+		return 1;
+	}
+	return 0;
+}
+
+/* Creates an RDS group.
+ * This generates sequences of the form 0A, 2A, 0A, 2A, 0A, 2A, etc.
+ */
+static void get_rds_group(uint16_t *blocks) {
+	static uint8_t state;
+
+	/* Basic block data */
+	blocks[0] = rds_data.pi;
+	blocks[1] = rds_data.tp << 10;
+	blocks[1] |= rds_data.pty << 5;
+	blocks[2] = 0;
+	blocks[3] = 0;
+
+	/* Generate block content */
+
+	/* CT (clock time) has priority over other group types */
+	if (rds_data.ct && get_rds_ct_group(blocks)) {
+		goto group_coded;
+	}
+
+	/* Next to top priority, if want top then just disable CT i guess */
+	if(get_rds_custom_groups(blocks)) {
+		goto group_coded;
+	}
+
+	/* Longer text groups get medium priority */
+	if (get_rds_long_text_groups(blocks)) {
+		goto group_coded;
+	}
+
+	/* Other groups */
+	if (get_rds_other_groups(blocks)) {
+		goto group_coded;
+	}
+
+	/* Standard group sequence
+	This group sequence is way better than the offcial one, official goes like: 0A 2A which is shitty here it is 0A 0A 0A 0A 2A 2A 2A 2A (2A) so we're in sequence and for example immiedietly get PS and quite fast get RT */
+	if(state < 6) {
+		/* 0A */
+		get_rds_ps_group(blocks);
+		state++;
+	} else if(state >= 6) {
+		/* 2A */
+		if(!get_rds_rt_group(blocks)) { /* try to generate 2A if can't generate 2A than that means our text is empty so we generate PS instead of wasting groups on nothing*/
+			get_rds_ps_group(blocks);
+		}
+		state++;
+	}
+	if (state >= 12) state = 0;
+
+group_coded:
+	/* for version B groups. good for custom groups */
+	if (IS_TYPE_B(blocks)) {
+		blocks[2] = rds_data.pi;
+	}
+}
+
+void get_rds_bits(uint8_t *bits) {
+	static uint16_t out_blocks[GROUP_LENGTH];
+	get_rds_group(out_blocks);
+#ifdef RDS2
+	add_checkwords(out_blocks, bits, false);
+#else
+	add_checkwords(out_blocks, bits);
+#endif
+}
+
+void init_rds_encoder(struct rds_params_t rds_params) {
+
+	/* AF */
+	if (rds_params.af.num_afs) {
+		set_rds_af(rds_params.af);
+		fprintf(stderr, show_af_list(rds_params.af));
+	}
+
+	set_rds_pi(rds_params.pi);
+	set_rds_ps(rds_params.ps);
+	rds_state.rt_ab = 1;
+	set_rds_rt1_enabled(1);
+	set_rds_rt1(rds_params.rt1);
+	set_rds_pty(rds_params.pty);
+	rds_state.ptyn_ab = 1;
+	set_rds_ptyn(rds_params.ptyn);
+	set_rds_lps(rds_params.lps);
+	set_rds_lpson(1);
+	set_rds_tp(rds_params.tp);
+	set_rds_ecc(rds_params.ecc);
+	set_rds_lic(rds_params.lic);
+	set_rds_ecclic_toggle(1);
+	set_rds_pin_enabled(1);
+	set_rds_ct(1);
+	set_rds_ms(1);
+	set_rds_di(DI_STEREO | DI_DPTY);
+
+	/* Assign the RT+ AID to group 11A */
+	#ifdef ODA_RTP
+	init_rtplus(GROUP_11A);
+	#endif
+
+	/* initialize modulator objects */
+	init_rds_objects();
+#ifdef RDS2
+	init_rds2_encoder(rds_params.rds2_image_path);
+#endif
+}
+
+void exit_rds_encoder() {
+	exit_rds_objects();
+#ifdef RDS2
+	exit_rds2_encoder();
+#endif
+}
+
+void set_rds_pi(uint16_t pi_code) {
+	rds_data.pi = pi_code;
+}
+
+void set_rds_ecc(uint8_t ecc) {
+	rds_data.ecc = ecc; /* ecc is 8 bits, so a byte */
+}
+
+void set_rds_lic(uint8_t lic) {
+	rds_data.lic = lic & INT16_L12; /* lic is 12 bits according to the docs, but the values can be less, for example english is 0x09 */
+}
+
+void set_rds_ecclic_toggle(uint8_t toggle) {
+	rds_state.ecclic_enabled = toggle & INT8_0;
+}
+
+void set_rds_pin_enabled(uint8_t enabled) {
+	rds_state.pin_enabled = enabled & INT8_0;
+}
+
+void set_rds_pin(uint8_t day, uint8_t hour, uint8_t minute) {
+	rds_data.pin_day = (day & INT8_L5);
+	rds_data.pin_hour = (hour & INT8_L5);
+	rds_data.pin_minute = (minute & INT8_L6);
+}
+
+void set_rds_rt1_enabled(uint8_t rt1en) {
+	rds_state.rt1_enabled = rt1en & INT8_0;
+}
+void set_rds_rt1(unsigned char *rt1) {
+	uint8_t i = 0, len = 0;
+
+	rds_state.rt_update = 1;
+	memset(rds_data.rt1, ' ', RT_LENGTH);
+	while (*rt1 != 0 && len < RT_LENGTH)
+		rds_data.rt1[len++] = *rt1++;
+
+	if (len < RT_LENGTH) {
+		rds_state.rt_segments = 0;
+
+		/* Terminate RT with '\r' (carriage return) if RT
+		 * is < 64 characters long
+		 */
+		rds_data.rt1[len++] = '\r';
+
+		/* find out how many segments are needed */
+		while (i < len) {
+			i += 4;
+			rds_state.rt_segments++;
+		}
+	} else {
+		/* Default to 16 if RT is 64 characters long */
+		rds_state.rt_segments = 16;
+	}
+}
+
+void set_rds_ps(unsigned char *ps) {
+	uint8_t len = 0;
+
+	rds_state.ps_update = 1;
+	memset(rds_data.ps, ' ', PS_LENGTH);
+	while (*ps != 0 && len < PS_LENGTH)
+		rds_data.ps[len++] = *ps++;
+}
+void set_rds_tpson(uint8_t tpson) {
+	rds_data.traffic_ps_on = tpson & INT8_0;
+}
+void set_rds_tps(unsigned char *tps) {
+	uint8_t len = 0;
+
+	rds_state.tps_update = 1;
+	memset(rds_data.tps, ' ', PS_LENGTH);
+	while (*tps != 0 && len < PS_LENGTH)
+		rds_data.tps[len++] = *tps++;
+}
+
+void set_rds_lpson(uint8_t lpson) {
+	rds_state.lps_on = lpson & INT8_0;
+}
+
+void set_rds_lps(unsigned char *lps) {
+	uint8_t i = 0, len = 0;
+
+	if (!lps[0]) {
+		memset(rds_data.lps, 0, LPS_LENGTH);
+		return;
+	}
+	rds_state.lps_update = 1;
+	memset(rds_data.lps, '\r', LPS_LENGTH);
+	while (*lps != 0 && len < LPS_LENGTH)
+		rds_data.lps[len++] = *lps++;
+
+	if (len < LPS_LENGTH) {
+		rds_state.lps_segments = 0;
+
+		/* increment to allow adding an '\r' in all cases */
+		len++;
+
+		/* find out how many segments are needed */
+		while (i < len) {
+			i += 4;
+			rds_state.lps_segments++;
+		}
+	} else {
+		/* default to 8 if LPS is 32 characters long */
+		rds_state.lps_segments = 8;
+	}
+}
+
+#ifdef ODA_RTP
+void set_rds_rtplus_flags(uint8_t flags) {
+	if(flags == 2) {
+		rtplus_cfg.enabled = 0;
+	} else {
+		rtplus_cfg.enabled = 1;
+	}
+	rtplus_cfg.running	= flags & INT8_0;
+}
+
+void set_rds_rtplus_tags(uint8_t *tags) {
+	rtplus_cfg.type[0]	= tags[0] & INT8_L6;
+	rtplus_cfg.start[0]	= tags[1] & INT8_L6;
+	rtplus_cfg.len[0]	= tags[2] & INT8_L6;
+	rtplus_cfg.type[1]	= tags[3] & INT8_L6;
+	rtplus_cfg.start[1]	= tags[4] & INT8_L6;
+	rtplus_cfg.len[1]	= tags[5] & INT8_L5;
+
+	rtplus_cfg.toggle ^= 1;
+	rtplus_cfg.running = 1;
+}
+#endif
+
+void set_rds_af(struct rds_af_t new_af_list) {
+	memcpy(&rds_data.af, &new_af_list, sizeof(struct rds_af_t));
+}
+
+void clear_rds_af() {
+	memset(&rds_data.af, 0, sizeof(struct rds_af_t));
+}
+
+void set_rds_pty(uint8_t pty) {
+	rds_data.pty = pty & INT8_L5;
+}
+
+void set_rds_ptyn_enabled(uint8_t enabled) {
+	rds_state.ptyn_enabled = enabled & INT8_0;
+}
+
+void set_rds_ptyn(unsigned char *ptyn) {
+	uint8_t len = 0;
+
+	if (!ptyn[0]) {
+		memset(rds_data.ptyn, 0, PTYN_LENGTH);
+		return;
+	}
+
+	rds_state.ptyn_update = 1;
+	memset(rds_data.ptyn, ' ', PTYN_LENGTH);
+	while (*ptyn != 0 && len < PTYN_LENGTH)
+		rds_data.ptyn[len++] = *ptyn++;
+}
+
+void set_rds_ta(uint8_t ta) {
+	rds_data.ta = ta & INT8_0;
+}
+
+void set_rds_tp(uint8_t tp) {
+	rds_data.tp = tp & INT8_0;
+}
+
+void set_rds_ms(uint8_t ms) {
+	rds_data.ms = ms & INT8_0;
+}
+
+void set_rds_di(uint8_t di) {
+	rds_data.di = di & INT8_L4;
+}
+
+void set_rds_ct(uint8_t ct) {
+	rds_data.ct = ct & INT8_0;
+}
+
+uint16_t get_rds_pi() {
+	/* this is for custom groups, specifically 'G=' */
+	return rds_data.pi;
+}
+
+void set_rds_cg(uint16_t* blocks) {
+	rds_state.custom_group[0] = blocks[0];
+	rds_state.custom_group[1] = blocks[1];
+	rds_state.custom_group[2] = blocks[2];
+	rds_state.custom_group[3] = blocks[3];
+	rds_state.custom_group_in = 1;
+}

src/rds.h

@@ -0,0 +1,336 @@
+/*
+ * mpxgen - FM multiplex encoder with Stereo and RDS
+ * Copyright (C) 2019 Anthony96922
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef RDS_H
+#define RDS_H
+
+/* The RDS error-detection code generator polynomial is
+ * x^10 + x^8 + x^7 + x^5 + x^4 + x^3 + x^0
+ */
+#define POLY			0x1B9
+#define POLY_DEG		10
+#define BLOCK_SIZE		16
+
+#define GROUP_LENGTH		4
+#define BITS_PER_GROUP		(GROUP_LENGTH * (BLOCK_SIZE + POLY_DEG))
+#define RDS_SAMPLE_RATE		190000
+#define SAMPLES_PER_BIT		160
+#define FILTER_SIZE		1120
+#define SAMPLE_BUFFER_SIZE	(SAMPLES_PER_BIT + FILTER_SIZE)
+
+/* Text items
+ *
+ */
+#define RT_LENGTH	64
+#define PS_LENGTH	8
+#define PTYN_LENGTH	8
+#define LPS_LENGTH	32
+
+/* AF list size
+ *
+ */
+#define MAX_AFS 25
+
+typedef struct rds_af_t {
+	uint8_t num_entries;
+	uint8_t num_afs;
+	uint8_t afs[MAX_AFS];
+} rds_af_t;
+
+/* AF codes */
+#define AF_CODE_FILLER		205
+#define AF_CODE_NO_AF		224
+#define AF_CODE_NUM_AFS_BASE	AF_CODE_NO_AF
+#define AF_CODE_LFMF_FOLLOWS	250
+
+typedef struct rds_params_t {
+	uint16_t pi; /*Program Identification*/
+	uint16_t lic; /* Language Identification code. lic should have 12 bits, 16 is the closest */
+	uint8_t ecc; /* Extended Country Code*/
+	uint8_t ta; /* Traffic Annoucement*/
+	uint8_t pty; /* Program Type */
+	uint8_t tp; /* Traffic Program */
+	uint8_t ms; /* Music/Speech */
+	uint8_t di; /* Decoder ID */
+
+	/* Program Service */
+	unsigned char ps[PS_LENGTH];
+	/* Traffic PS */
+	uint8_t traffic_ps_on;
+	unsigned char tps[PS_LENGTH];
+
+	/* Radio Text */
+	unsigned char rt1[RT_LENGTH];
+
+	/* Program Type Name */
+	unsigned char ptyn[PTYN_LENGTH];
+
+	/* Alternative Frequencies */
+	struct rds_af_t af;
+
+	/* Clock-time */
+	uint8_t ct;
+
+	/* Long PS */
+	unsigned char lps[LPS_LENGTH];
+
+	/* Program Item Number */
+	uint8_t pin_day;
+	uint8_t pin_hour;
+	uint8_t pin_minute;
+
+	#ifdef RDS2
+	/* RDS2 image path*/
+	char rds2_image_path[51];
+	#endif
+} rds_params_t;
+/* Here, the first member of the struct must be a scalar to avoid a
+   warning on -Wmissing-braces with GCC < 4.8.3
+   (bug: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=53119)
+*/
+
+/* Group type
+ *
+ * 0-15
+ */
+#define GROUP_TYPE_0	( 0 << 4)
+#define GROUP_TYPE_1	( 1 << 4)
+#define GROUP_TYPE_2	( 2 << 4)
+#define GROUP_TYPE_3	( 3 << 4)
+#define GROUP_TYPE_4	( 4 << 4)
+#define GROUP_TYPE_5	( 5 << 4)
+#define GROUP_TYPE_6	( 6 << 4)
+#define GROUP_TYPE_7	( 7 << 4)
+#define GROUP_TYPE_8	( 8 << 4)
+#define GROUP_TYPE_9	( 9 << 4)
+#define GROUP_TYPE_10	(10 << 4)
+#define GROUP_TYPE_11	(11 << 4)
+#define GROUP_TYPE_12	(12 << 4)
+#define GROUP_TYPE_13	(13 << 4)
+#define GROUP_TYPE_14	(14 << 4)
+#define GROUP_TYPE_15	(15 << 4)
+
+/* Group versions
+ *
+ * The first 4 bits are the group number and the remaining 4 are
+ * the group version
+ */
+#define GROUP_VER_A	0
+#define GROUP_VER_B	1
+
+/* Version A groups */
+#define GROUP_0A	(GROUP_TYPE_0  | GROUP_VER_A)
+#define GROUP_1A	(GROUP_TYPE_1  | GROUP_VER_A)
+#define GROUP_2A	(GROUP_TYPE_2  | GROUP_VER_A)
+#define GROUP_3A	(GROUP_TYPE_3  | GROUP_VER_A)
+#define GROUP_4A	(GROUP_TYPE_4  | GROUP_VER_A)
+#define GROUP_5A	(GROUP_TYPE_5  | GROUP_VER_A)
+#define GROUP_6A	(GROUP_TYPE_6  | GROUP_VER_A)
+#define GROUP_7A	(GROUP_TYPE_7  | GROUP_VER_A)
+#define GROUP_8A	(GROUP_TYPE_8  | GROUP_VER_A)
+#define GROUP_9A	(GROUP_TYPE_9  | GROUP_VER_A)
+#define GROUP_10A	(GROUP_TYPE_10 | GROUP_VER_A)
+#define GROUP_11A	(GROUP_TYPE_11 | GROUP_VER_A)
+#define GROUP_12A	(GROUP_TYPE_12 | GROUP_VER_A)
+#define GROUP_13A	(GROUP_TYPE_13 | GROUP_VER_A)
+#define GROUP_14A	(GROUP_TYPE_14 | GROUP_VER_A)
+#define GROUP_15A	(GROUP_TYPE_15 | GROUP_VER_A)
+
+/* Version B groups */
+#define GROUP_0B	(GROUP_TYPE_0  | GROUP_VER_B)
+#define GROUP_1B	(GROUP_TYPE_1  | GROUP_VER_B)
+#define GROUP_2B	(GROUP_TYPE_2  | GROUP_VER_B)
+#define GROUP_3B	(GROUP_TYPE_3  | GROUP_VER_B)
+#define GROUP_4B	(GROUP_TYPE_4  | GROUP_VER_B)
+#define GROUP_5B	(GROUP_TYPE_5  | GROUP_VER_B)
+#define GROUP_6B	(GROUP_TYPE_6  | GROUP_VER_B)
+#define GROUP_7B	(GROUP_TYPE_7  | GROUP_VER_B)
+#define GROUP_8B	(GROUP_TYPE_8  | GROUP_VER_B)
+#define GROUP_9B	(GROUP_TYPE_9  | GROUP_VER_B)
+#define GROUP_10B	(GROUP_TYPE_10 | GROUP_VER_B)
+#define GROUP_11B	(GROUP_TYPE_11 | GROUP_VER_B)
+#define GROUP_12B	(GROUP_TYPE_12 | GROUP_VER_B)
+#define GROUP_13B	(GROUP_TYPE_13 | GROUP_VER_B)
+#define GROUP_14B	(GROUP_TYPE_14 | GROUP_VER_B)
+#define GROUP_15B	(GROUP_TYPE_15 | GROUP_VER_B)
+
+#define GET_GROUP_TYPE(x)	((x >> 4) & 15)
+#define GET_GROUP_VER(x)	(x & 1) /* only check bit 0 */
+
+#define DI_STEREO	(1 << 0) /* 1 - Stereo */
+#define DI_AH		(1 << 1) /* 2 - Artificial Head */
+#define DI_COMPRESSED	(1 << 2) /* 4 - Compressed */
+#define DI_DPTY		(1 << 3) /* 8 - Dynamic PTY */
+
+/* Bit mask */
+
+/* 8 bit */
+#define INT8_ALL	0xff
+/* Lower */
+#define INT8_L1		0x01
+#define INT8_L2		0x03
+#define INT8_L3		0x07
+#define INT8_L4		0x0f
+#define INT8_L5		0x1f
+#define INT8_L6		0x3f
+#define INT8_L7		0x7f
+/* Upper */
+#define INT8_U7		0xfe
+#define INT8_U6		0xfc
+#define INT8_U5		0xf8
+#define INT8_U4		0xf0
+#define INT8_U3		0xe0
+#define INT8_U2		0xc0
+#define INT8_U1		0x80
+/* Single */
+#define INT8_0		0x01
+#define INT8_1		0x02
+#define INT8_2		0x04
+#define INT8_3		0x08
+#define INT8_4		0x10
+#define INT8_5		0x20
+#define INT8_6		0x40
+#define INT8_7		0x80
+
+/* 16 bit */
+#define INT16_ALL	0xffff
+/* Lower */
+#define INT16_L1	0x0001
+#define INT16_L2	0x0003
+#define INT16_L3	0x0007
+#define INT16_L4	0x000f
+#define INT16_L5	0x001f
+#define INT16_L6	0x003f
+#define INT16_L7	0x007f
+#define INT16_L8	0x00ff
+#define INT16_L9	0x01ff
+#define INT16_L10	0x03ff
+#define INT16_L11	0x07ff
+#define INT16_L12	0x0fff
+#define INT16_L13	0x1fff
+#define INT16_L14	0x3fff
+#define INT16_L15	0x7fff
+/* Upper */
+#define INT16_U15	0xfffe
+#define INT16_U14	0xfffc
+#define INT16_U13	0xfff8
+#define INT16_U12	0xfff0
+#define INT16_U11	0xffe0
+#define INT16_U10	0xffc0
+#define INT16_U9	0xff80
+#define INT16_U8	0xff00
+#define INT16_U7	0xfe00
+#define INT16_U6	0xfc00
+#define INT16_U5	0xf800
+#define INT16_U4	0xf000
+#define INT16_U3	0xe000
+#define INT16_U2	0xc000
+#define INT16_U1	0x8000
+/* Single */
+#define INT16_0		0x0001
+#define INT16_1		0x0002
+#define INT16_2		0x0004
+#define INT16_3		0x0008
+#define INT16_4		0x0010
+#define INT16_5		0x0020
+#define INT16_6		0x0040
+#define INT16_7		0x0080
+#define INT16_8		0x0100
+#define INT16_9		0x0200
+#define INT16_10	0x0400
+#define INT16_11	0x0800
+#define INT16_12	0x1000
+#define INT16_13	0x2000
+#define INT16_14	0x4000
+#define INT16_15	0x8000
+
+/* 18 bit (for RDS2) */
+#define INT18_U2	0x30000
+#define INT18_L4	0x0000f
+
+#define IS_TYPE_B(a)	(a[1] & INT16_11)
+#ifdef RDS2
+#define IS_TUNNELING(a)	(a[0] == 0x0000)
+#endif
+
+#ifdef ODA
+/*
+ * RDS ODA ID group
+ *
+ * This struct is for defining ODAs that will be transmitted
+ *
+ * Can signal version A or B data groups
+ */
+typedef struct rds_oda_t {
+	uint8_t group;
+	uint16_t aid;
+	uint16_t scb;
+} rds_oda_t;
+
+#define MAX_ODAS	8
+
+/*
+ * ODA AID
+ *
+ * Extensive list: https://www.nrscstandards.org/committees/dsm/archive/rds-oda-aids.pdf
+ */
+#define	ODA_AID_RTPLUS	0x4bd7
+#endif
+/* RDS2 */
+#define ODA_AID_RFT	0xff7f
+#define ODA_AID_RFTPLUS	0xff80
+
+extern void init_rds_encoder(struct rds_params_t rds_params);
+extern void exit_rds_encoder();
+extern void get_rds_bits(uint8_t *bits);
+extern void set_rds_pi(uint16_t pi_code);
+extern void set_rds_ecc(uint8_t ecc);
+extern void set_rds_lic(uint8_t lic);
+extern void set_rds_ecclic_toggle(uint8_t toggle);
+extern void set_rds_pin_enabled(uint8_t enabled);
+extern void set_rds_pin(uint8_t day, uint8_t hour, uint8_t minute);
+extern void set_rds_rt1_enabled(uint8_t rt1en);
+extern void set_rds_rt1(unsigned char *rt1);
+extern void set_rds_ps(unsigned char *ps);
+extern void set_rds_tpson(uint8_t tpson);
+extern void set_rds_tps(unsigned char *ps);
+extern void set_rds_lpson(uint8_t lpson);
+extern void set_rds_lps(unsigned char *lps);
+#ifdef ODA_RTP
+extern void set_rds_rtplus_flags(uint8_t flags);
+extern void set_rds_rtplus_tags(uint8_t *tags);
+#endif
+extern void set_rds_ta(uint8_t ta);
+extern void set_rds_pty(uint8_t pty);
+extern void set_rds_ptyn_enabled(uint8_t enabled);
+extern void set_rds_ptyn(unsigned char *ptyn);
+extern void set_rds_af(struct rds_af_t new_af_list);
+extern void clear_rds_af();
+extern void set_rds_tp(uint8_t tp);
+extern void set_rds_ms(uint8_t ms);
+extern void set_rds_ct(uint8_t ct);
+extern void set_rds_di(uint8_t di);
+#ifdef RDS2
+extern float get_rds_sample(uint8_t stream_num, uint8_t rds2tunneling);
+#else
+extern float get_rds_sample(uint8_t stream_num);
+#endif
+extern uint16_t get_rds_pi();
+extern void set_rds_cg(uint16_t* blocks);
+
+#endif /* RDS_H */

src/rds2.c

@@ -0,0 +1,452 @@
+/*
+ * mpxgen - FM multiplex encoder with Stereo and RDS
+ * Copyright (C) 2019-2020 Anthony96922
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "common.h"
+#include "rds.h"
+#include "rds2.h"
+#include "lib.h"
+
+/*
+ * RDS2-specific stuff
+ */
+
+
+/* RFT */
+
+/* fallback station logo */
+#include "rds2_image_data.c"
+
+/* station logo */
+static struct rft_t station_logo_stream;
+
+static void init_rft(struct rft_t *rft, uint8_t file_id,
+	bool usecrc, uint8_t crc_mode, char *file_path) {
+	uint32_t seg_counter = 0;
+	uint32_t crc_chunk_counter = 0;
+	uint16_t crc_chunk_size = 0;
+	FILE *image_file_hdlr;
+
+	rft->file_path = malloc(MAX_FILE_NAME_LEN + 1);
+	rft->file_path[MAX_FILE_NAME_LEN] = 0;
+	rft->file_data = malloc(MAX_IMAGE_LEN);
+	rft->crcs = malloc(MAX_CRC_CHUNK_ADDR * sizeof(uint16_t));
+
+	/* unused data must be padded with zeroes */
+	memset(rft->file_data, 0, MAX_IMAGE_LEN);
+
+	strncpy(rft->file_path, file_path, MAX_FILE_NAME_LEN);
+
+	/* open file in binary mode */
+	image_file_hdlr = fopen(file_path, "rb");
+	if (image_file_hdlr != NULL) {
+		fseek(image_file_hdlr, 0, SEEK_END);
+		rft->file_len = ftell(image_file_hdlr);
+		rewind(image_file_hdlr);
+
+		/* image cannot be larger than 163840 bytes */
+		if (rft->file_len > MAX_IMAGE_LEN) {
+#ifdef RDS2_DEBUG
+			fprintf(stderr, "W: Image too large!\n");
+#endif
+			rft->file_len = MAX_IMAGE_LEN;
+		}
+
+		/* copy image data to local buffer */
+		fread(rft->file_data, rft->file_len, 1, image_file_hdlr);
+
+		fclose(image_file_hdlr);
+	} else { /* fallback in case file can't be read at startup */
+		rft->file_len = station_logo_len;
+
+		if (rft->file_len > MAX_IMAGE_LEN) {
+			rft->file_len = MAX_IMAGE_LEN;
+		}
+
+		memcpy(rft->file_data, station_logo, rft->file_len);
+	}
+
+	/* keep track of file lengths so we know when to toggle */
+	rft->prev_file_len = rft->file_len;
+	rft->channel = 0;
+	rft->file_id = file_id;
+	rft->toggle = 0;
+	rft->num_segs = 0;
+
+	/* determine how many segments we need */
+	while (seg_counter < rft->file_len) {
+		seg_counter += 5;
+		rft->num_segs++;
+	}
+
+	rft->use_crc = usecrc;
+
+	/* if CRC is disabled exit early */
+	if (!rft->use_crc) {
+		rft->crc_mode = 0;
+		rft->num_crc_chunks = 1; /* only 1 */
+		rft->crcs[0] = 0x0000;
+		return;
+	}
+
+	rft->crc_mode = crc_mode & 7;
+
+	switch (rft->crc_mode) {
+	case RFT_CRC_MODE_ENTIRE_FILE:
+		/* no-op */
+		break;
+
+	case RFT_CRC_MODE_16_GROUPS:
+		crc_chunk_size = 16;
+		break;
+
+	case RFT_CRC_MODE_32_GROUPS:
+		crc_chunk_size = 32;
+		break;
+
+	case RFT_CRC_MODE_64_GROUPS:
+		crc_chunk_size = 64;
+		break;
+
+	case RFT_CRC_MODE_128_GROUPS:
+		crc_chunk_size = 128;
+		break;
+
+	case RFT_CRC_MODE_256_GROUPS:
+		crc_chunk_size = 256;
+		break;
+
+	case RFT_CRC_MODE_RFU: /* reserved - use auto mode */
+	case RFT_CRC_MODE_AUTO:
+		if (rft->file_len >= 81920) {
+			crc_chunk_size = 64;
+			rft->crc_mode = RFT_CRC_MODE_64_GROUPS;
+		} else if (rft->file_len > 40960) {
+			crc_chunk_size = 32;
+			rft->crc_mode = RFT_CRC_MODE_32_GROUPS;
+		} else {
+			crc_chunk_size = 16;
+			rft->crc_mode = RFT_CRC_MODE_16_GROUPS;
+		}
+		break;
+	}
+
+	if (rft->crc_mode) { /* chunked modes */
+		/* RFT packet size = chunk size * 5 data bytes per group */
+		rft->pkt_size = crc_chunk_size * 5;
+
+		/* the remainder (if file size is not a multiple of pkt_size) */
+		rft->pkt_size_rem = rft->file_len % rft->pkt_size;
+
+		/* calculate number of CRC chunks */
+		while (crc_chunk_counter <= rft->file_len) {
+			crc_chunk_counter += rft->pkt_size;
+			rft->num_crc_chunks++;
+		}
+
+		rft->crc_chunks = malloc(rft->pkt_size);
+
+		/* calculate CRC's for chunks */
+		for (uint16_t i = 0; i < rft->num_crc_chunks; i++) {
+			memset(rft->crc_chunks, 0, rft->pkt_size);
+			memcpy(rft->crc_chunks,
+				rft->file_data + i * rft->pkt_size, rft->pkt_size);
+			if ((i == rft->num_crc_chunks - 1) && rft->pkt_size_rem) {
+				/* last chunk may have less bytes */
+				rft->crcs[i] = crc16(rft->crc_chunks, rft->pkt_size_rem);
+			} else {
+				rft->crcs[i] = crc16(rft->crc_chunks, rft->pkt_size);
+			}
+		}
+
+		free(rft->crc_chunks);
+	} else { /* CRC of entire file */
+		rft->num_crc_chunks = 1; /* only 1 */
+		rft->crcs[0] = crc16(rft->file_data, rft->file_len);
+	}
+}
+
+static void update_rft(struct rft_t *rft) {
+	uint32_t seg_counter = 0;
+	FILE *image_file_hdlr;
+
+	/* open file in binary mode */
+	image_file_hdlr = fopen(rft->file_path, "rb");
+	if (image_file_hdlr == NULL) {
+		return;
+	}
+
+	rft->prev_file_len = rft->file_len;
+
+	/* update size field */
+	fseek(image_file_hdlr, 0, SEEK_END);
+	rft->file_len = ftell(image_file_hdlr);
+	rewind(image_file_hdlr);
+
+	/* file didn't change so return early */
+	if (rft->file_len == rft->prev_file_len) {
+		fclose(image_file_hdlr);
+		return;
+	}
+
+	/* image cannot be larger than 163840 bytes */
+	if (rft->file_len > MAX_IMAGE_LEN) {
+#ifdef RDS2_DEBUG
+		fprintf(stderr, "W: Image too large!\n");
+#endif
+		rft->file_len = MAX_IMAGE_LEN;
+	}
+
+	/* copy image data to local buffer */
+	fread(rft->file_data, rft->file_len, 1, image_file_hdlr);
+
+	fclose(image_file_hdlr);
+
+	rft->num_segs = 0;
+
+	/* recalculate # of needed segments */
+	while (seg_counter < rft->file_len) {
+		seg_counter += 5;
+		rft->num_segs++;
+	}
+
+	if (rft->crc_mode) {
+		/* recalculate CRC's for chunks */
+		for (uint16_t i = 0; i < rft->num_crc_chunks; i++) {
+			memset(rft->crc_chunks, 0, rft->pkt_size);
+			memcpy(rft->crc_chunks,
+				rft->file_data + i * rft->pkt_size, rft->pkt_size);
+			if ((i == rft->num_crc_chunks - 1) && rft->pkt_size_rem) {
+				/* last chunk may have less bytes */
+				rft->crcs[i] = crc16(rft->crc_chunks, rft->pkt_size_rem);
+			} else {
+				rft->crcs[i] = crc16(rft->crc_chunks, rft->pkt_size);
+			}
+		}
+
+		free(rft->crc_chunks);
+	} else { /* CRC of entire file */
+		rft->num_crc_chunks = 1; /* only 1 */
+		rft->crcs[0] = crc16(rft->file_data, rft->file_len);
+	}
+
+	if (++rft->file_version == 8) {
+		rft->file_version = 0;
+	}
+}
+
+static void exit_rft(struct rft_t *rft) {
+	free(rft->file_data);
+	free(rft->file_path);
+	free(rft->crcs);
+}
+
+/*
+ * RFT variant 0 (file metadata)
+ *
+ * Carries:
+ * - Function Header
+ * - Pipe Number
+ * - ODA ID
+ * - Variant code (0)
+ * - CRC-16 Flag
+ * - File ID
+ * - File size (18 bits)
+ */
+static void get_rft_var_0_data_group(struct rft_t *rft, uint16_t *blocks) {
+	/* function header */
+	blocks[0] = 1 << 15;
+	blocks[0] |= (rft->channel & INT8_L4); /* pipe number */
+
+	/* ODA ID */
+	blocks[1] = ODA_AID_RFT;
+
+	blocks[2] = (0 & INT18_L4) << 12; /* variant code */
+	blocks[2] |= ((rft->use_crc ? 1 : 0) & INT8_L1) << 11; /* CRC */
+	blocks[2] |= (rft->file_version & INT8_L3) << 8; /* file version */
+	blocks[2] |= (rft->file_id & INT8_L6) << 2; /* file ID */
+	blocks[2] |= (rft->file_len & INT18_U2) >> 16;
+
+	blocks[3] = rft->file_len & INT16_ALL;
+}
+
+/*
+ * RFT variant 1 (chunk to CRC mappings)
+ *
+ * Carries:
+ * - Function Header
+ * - Pipe Number
+ * - ODA ID
+ * - Variant Code (1)
+ * - CRC Mode
+ * - Chunk Address (9 bits)
+ * - CRC
+ */
+static void get_rft_var_1_data_group(struct rft_t *rft, uint16_t *blocks) {
+	/* function header */
+	blocks[0] = 1 << 15;
+	blocks[0] |= (rft->channel & INT8_L4); /* pipe number */
+
+	/* ODA ID */
+	blocks[1] = ODA_AID_RFT;
+
+	blocks[2] = (1 & INT8_L4) << 12; /* variant code */
+	blocks[2] |= (rft->crc_mode & INT8_L3) << 9; /* CRC mode */
+	/* chunk address */
+	blocks[2] |= rft->crc_chunk_addr & INT16_L9;
+
+	/* CRC */
+	blocks[3] = rft->crcs[rft->crc_chunk_addr];
+
+	if (++rft->crc_chunk_addr > rft->num_crc_chunks) {
+#ifdef RDS2_DEBUG
+		fprintf(stderr, "File CRC sending complete\n");
+#endif
+		rft->crc_chunk_addr = 0;
+	}
+}
+
+/*
+ * RFT variants 2-15 (custom variants)
+ *
+ * Carries:
+ * - Function Header
+ * - Pipe Number
+ * - Variant code
+ * - Variant data:
+ *   - 2-7 carries file-related data
+ *   - 8-15 ODA data that is not related
+ */
+#if 0
+static void get_rft_var_2_15_data_group(struct rft_t *rft, uint16_t *blocks) {
+	/* function header */
+	blocks[0] = (2 << 6) << 8;
+	blocks[0] |= (rft->channel & INT8_L4); /* pipe number */
+
+	/* ODA ID */
+	blocks[1] = ODA_AID_RFT;
+
+	blocks[2] = (8 & INT8_L4) << 12; /* variant code */
+	blocks[2] |= 0 & INT16_L12;
+	blocks[3] = 0 & INT16_ALL;
+}
+#endif
+
+/*
+ * RFT data group (for file data TXing)
+ *
+ * Carries:
+ * - Function Header
+ * - Pipe Number
+ * - Toggle Bit
+ * - Segment address (15 bits)
+ * - File data (5 bytes per group)
+ */
+static void get_rft_file_data_group(struct rft_t *rft, uint16_t *blocks) {
+	/* function header */
+	blocks[0] = 2 << 12;
+	blocks[0] |= (rft->channel & INT8_L4) << 8; /* pipe number */
+
+	/* toggle bit */
+	blocks[0] |= (rft->toggle & INT16_L1) << 7;
+
+	/* segment address */
+	blocks[0] |= ((rft->seg_addr_img & INT16_U8) >> 8) & INT16_L7;
+	blocks[1] = (rft->seg_addr_img & INT16_L8) << 8;
+
+	/* image data */
+	blocks[1] |= rft->file_data[rft->seg_addr_img * 5 + 0];
+	blocks[2] =  rft->file_data[rft->seg_addr_img * 5 + 1] << 8;
+	blocks[2] |= rft->file_data[rft->seg_addr_img * 5 + 2];
+	blocks[3] =  rft->file_data[rft->seg_addr_img * 5 + 3] << 8;
+	blocks[3] |= rft->file_data[rft->seg_addr_img * 5 + 4];
+
+	if (++rft->seg_addr_img > rft->num_segs) {
+#ifdef RDS2_DEBUG
+		fprintf(stderr, "File sending complete\n");
+#endif
+		rft->seg_addr_img = 0;
+		rft->toggle ^= 1;
+		update_rft(rft);
+	}
+}
+
+static void get_rft_stream(uint16_t *blocks) {
+	static uint8_t rft_state;
+
+	switch (rft_state) {
+		case 0:
+			get_rft_var_0_data_group(&station_logo_stream, blocks);
+			break;
+		case 1:
+			get_rft_var_1_data_group(&station_logo_stream, blocks);
+			break;
+		case 2:
+			get_rft_var_0_data_group(&station_logo_stream, blocks);
+			break;
+		case 3:
+			get_rft_var_1_data_group(&station_logo_stream, blocks);
+			break;
+
+		default:
+			get_rft_file_data_group(&station_logo_stream, blocks);
+			break;
+	}
+
+	rft_state++;
+	if (rft_state == 50) rft_state = 0;
+}
+
+/*
+ * RDS 2 group sequence
+ */
+static void get_rds2_group(uint8_t stream_num, uint16_t *blocks) {
+
+	switch (stream_num) {
+	case 1:
+	case 2:
+	case 3:
+	default:
+		get_rft_stream(blocks);
+		break;
+	}
+
+#ifdef RDS2_DEBUG
+	fprintf(stderr, "Stream %u: %04x %04x %04x %04x\n",
+		stream_num, blocks[0], blocks[1], blocks[2], blocks[3]);
+#endif
+}
+
+void get_rds2_bits(uint8_t stream, uint8_t *bits) {
+	static uint16_t out_blocks[GROUP_LENGTH];
+	get_rds2_group(stream, out_blocks);
+	add_checkwords(out_blocks, bits, true);
+}
+
+void init_rds2_encoder(char *station_logo_path) {
+	/* create a new stream for the station logo */
+	init_rft(&station_logo_stream,
+		0 /* file ID */,
+		false /* don't use crc */,
+		RFT_CRC_MODE_AUTO,
+		station_logo_path
+	);
+}
+
+void exit_rds2_encoder() {
+	exit_rft(&station_logo_stream);
+}

src/rds2.h

@@ -0,0 +1,71 @@
+/*
+ * mpxgen - FM multiplex encoder with Stereo and RDS
+ * Copyright (C) 2019-2020 Anthony96922
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+typedef struct rds2_oda_t {
+	uint16_t aid;
+	uint8_t channel;
+} rds2_oda_t;
+
+#define GET_RDS2_ODA_CHANNEL(x)	(x & INT8_L5)
+
+#define MAX_FILE_NAME_LEN	64 /* does not include terminating null char */
+#define MAX_IMAGE_LEN		163840
+#define MAX_CRC_CHUNK_ADDR	511
+
+/* RFT CRC mode */
+enum rft_crc_mode {
+	RFT_CRC_MODE_ENTIRE_FILE,	/* over entire file (universal) */
+	RFT_CRC_MODE_16_GROUPS,		/* chunks of 16 groups (size <= 40,960) */
+	RFT_CRC_MODE_32_GROUPS,		/* chunks of 32 groups (40,960 < size <= 81,920) */
+	RFT_CRC_MODE_64_GROUPS,		/* chunks of 64 groups (size > 81,960) */
+	RFT_CRC_MODE_128_GROUPS,	/* chunks of 128 groups (size > 81,960) */
+	RFT_CRC_MODE_256_GROUPS,	/* chunks of 256 groups (size > 81,960) */
+	RFT_CRC_MODE_RFU,		/* reserved */
+	RFT_CRC_MODE_AUTO		/* automatic between 1-3 based on size */
+};
+
+/* RDS2 File Transfer */
+typedef struct rft_t {
+	uint8_t channel;
+
+	char *file_path;
+	unsigned char *file_data;
+	size_t file_len;
+	size_t prev_file_len;
+	uint8_t file_version;
+	uint8_t file_id;
+	uint8_t variant_code;
+	uint8_t toggle;
+
+	uint16_t pkt_size;
+	uint16_t pkt_size_rem;
+	uint16_t seg_addr_img;
+	uint16_t num_segs;
+
+	/* CRC chunk map */
+	bool use_crc;
+	uint8_t crc_mode;
+	uint16_t crc_chunk_addr;
+	uint16_t num_crc_chunks;
+	uint8_t *crc_chunks;
+	uint16_t *crcs;
+} rft_t;
+
+extern void get_rds2_bits(uint8_t stream_num, uint8_t *bits);
+extern void init_rds2_encoder(char *station_logo_path);
+extern void exit_rds2_encoder();

src/rds2_image_data.c

@@ -0,0 +1,181 @@
+static const unsigned char station_logo[] = {
+  0xff, 0xd8, 0xff, 0xe0, 0x00, 0x10, 0x4a, 0x46, 0x49, 0x46, 0x00, 0x01,
+  0x01, 0x00, 0x00, 0x01, 0x00, 0x01, 0x00, 0x00, 0xff, 0xe2, 0x01, 0xd8,
+  0x49, 0x43, 0x43, 0x5f, 0x50, 0x52, 0x4f, 0x46, 0x49, 0x4c, 0x45, 0x00,
+  0x01, 0x01, 0x00, 0x00, 0x01, 0xc8, 0x00, 0x00, 0x00, 0x00, 0x04, 0x30,
+  0x00, 0x00, 0x6d, 0x6e, 0x74, 0x72, 0x52, 0x47, 0x42, 0x20, 0x58, 0x59,
+  0x5a, 0x20, 0x07, 0xe0, 0x00, 0x01, 0x00, 0x01, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x61, 0x63, 0x73, 0x70, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0x00, 0x00,
+  0xf6, 0xd6, 0x00, 0x01, 0x00, 0x00, 0x00, 0x00, 0xd3, 0x2d, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x09, 0x64, 0x65, 0x73, 0x63, 0x00, 0x00, 0x00, 0xf0, 0x00, 0x00,
+  0x00, 0x24, 0x72, 0x58, 0x59, 0x5a, 0x00, 0x00, 0x01, 0x14, 0x00, 0x00,
+  0x00, 0x14, 0x67, 0x58, 0x59, 0x5a, 0x00, 0x00, 0x01, 0x28, 0x00, 0x00,
+  0x00, 0x14, 0x62, 0x58, 0x59, 0x5a, 0x00, 0x00, 0x01, 0x3c, 0x00, 0x00,
+  0x00, 0x14, 0x77, 0x74, 0x70, 0x74, 0x00, 0x00, 0x01, 0x50, 0x00, 0x00,
+  0x00, 0x14, 0x72, 0x54, 0x52, 0x43, 0x00, 0x00, 0x01, 0x64, 0x00, 0x00,
+  0x00, 0x28, 0x67, 0x54, 0x52, 0x43, 0x00, 0x00, 0x01, 0x64, 0x00, 0x00,
+  0x00, 0x28, 0x62, 0x54, 0x52, 0x43, 0x00, 0x00, 0x01, 0x64, 0x00, 0x00,
+  0x00, 0x28, 0x63, 0x70, 0x72, 0x74, 0x00, 0x00, 0x01, 0x8c, 0x00, 0x00,
+  0x00, 0x3c, 0x6d, 0x6c, 0x75, 0x63, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x01, 0x00, 0x00, 0x00, 0x0c, 0x65, 0x6e, 0x55, 0x53, 0x00, 0x00,
+  0x00, 0x08, 0x00, 0x00, 0x00, 0x1c, 0x00, 0x73, 0x00, 0x52, 0x00, 0x47,
+  0x00, 0x42, 0x58, 0x59, 0x5a, 0x20, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x6f, 0xa2, 0x00, 0x00, 0x38, 0xf5, 0x00, 0x00, 0x03, 0x90, 0x58, 0x59,
+  0x5a, 0x20, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x62, 0x99, 0x00, 0x00,
+  0xb7, 0x85, 0x00, 0x00, 0x18, 0xda, 0x58, 0x59, 0x5a, 0x20, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x24, 0xa0, 0x00, 0x00, 0x0f, 0x84, 0x00, 0x00,
+  0xb6, 0xcf, 0x58, 0x59, 0x5a, 0x20, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0xf6, 0xd6, 0x00, 0x01, 0x00, 0x00, 0x00, 0x00, 0xd3, 0x2d, 0x70, 0x61,
+  0x72, 0x61, 0x00, 0x00, 0x00, 0x00, 0x00, 0x04, 0x00, 0x00, 0x00, 0x02,
+  0x66, 0x66, 0x00, 0x00, 0xf2, 0xa7, 0x00, 0x00, 0x0d, 0x59, 0x00, 0x00,
+  0x13, 0xd0, 0x00, 0x00, 0x0a, 0x5b, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x6d, 0x6c, 0x75, 0x63, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x01, 0x00, 0x00, 0x00, 0x0c, 0x65, 0x6e, 0x55, 0x53, 0x00, 0x00,
+  0x00, 0x20, 0x00, 0x00, 0x00, 0x1c, 0x00, 0x47, 0x00, 0x6f, 0x00, 0x6f,
+  0x00, 0x67, 0x00, 0x6c, 0x00, 0x65, 0x00, 0x20, 0x00, 0x49, 0x00, 0x6e,
+  0x00, 0x63, 0x00, 0x2e, 0x00, 0x20, 0x00, 0x32, 0x00, 0x30, 0x00, 0x31,
+  0x00, 0x36, 0xff, 0xdb, 0x00, 0x43, 0x00, 0x1b, 0x12, 0x14, 0x17, 0x14,
+  0x11, 0x1b, 0x17, 0x16, 0x17, 0x1e, 0x1c, 0x1b, 0x20, 0x28, 0x42, 0x2b,
+  0x28, 0x25, 0x25, 0x28, 0x51, 0x3a, 0x3d, 0x30, 0x42, 0x60, 0x55, 0x65,
+  0x64, 0x5f, 0x55, 0x5d, 0x5b, 0x6a, 0x78, 0x99, 0x81, 0x6a, 0x71, 0x90,
+  0x73, 0x5b, 0x5d, 0x85, 0xb5, 0x86, 0x90, 0x9e, 0xa3, 0xab, 0xad, 0xab,
+  0x67, 0x80, 0xbc, 0xc9, 0xba, 0xa6, 0xc7, 0x99, 0xa8, 0xab, 0xa4, 0xff,
+  0xdb, 0x00, 0x43, 0x01, 0x1c, 0x1e, 0x1e, 0x28, 0x23, 0x28, 0x4e, 0x2b,
+  0x2b, 0x4e, 0xa4, 0x6e, 0x5d, 0x6e, 0xa4, 0xa4, 0xa4, 0xa4, 0xa4, 0xa4,
+  0xa4, 0xa4, 0xa4, 0xa4, 0xa4, 0xa4, 0xa4, 0xa4, 0xa4, 0xa4, 0xa4, 0xa4,
+  0xa4, 0xa4, 0xa4, 0xa4, 0xa4, 0xa4, 0xa4, 0xa4, 0xa4, 0xa4, 0xa4, 0xa4,
+  0xa4, 0xa4, 0xa4, 0xa4, 0xa4, 0xa4, 0xa4, 0xa4, 0xa4, 0xa4, 0xa4, 0xa4,
+  0xa4, 0xa4, 0xa4, 0xa4, 0xa4, 0xa4, 0xa4, 0xa4, 0xff, 0xc0, 0x00, 0x11,
+  0x08, 0x00, 0xcd, 0x00, 0xcd, 0x03, 0x01, 0x22, 0x00, 0x02, 0x11, 0x01,
+  0x03, 0x11, 0x01, 0xff, 0xc4, 0x00, 0x1a, 0x00, 0x01, 0x01, 0x01, 0x01,
+  0x01, 0x01, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x05, 0x04, 0x06, 0x02, 0x03, 0x01, 0xff, 0xc4, 0x00, 0x3c, 0x10,
+  0x00, 0x01, 0x03, 0x03, 0x02, 0x02, 0x05, 0x09, 0x05, 0x08, 0x03, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x11, 0x12,
+  0x21, 0x06, 0x31, 0x13, 0x22, 0x41, 0x91, 0xa1, 0x14, 0x32, 0x51, 0x61,
+  0x71, 0x73, 0x81, 0xb1, 0xd1, 0x34, 0x36, 0x52, 0xc2, 0xe1, 0x16, 0x24,
+  0x33, 0x35, 0x42, 0x44, 0x82, 0xc1, 0x54, 0xb2, 0xf0, 0xff, 0xc4, 0x00,
+  0x14, 0x01, 0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xff, 0xc4, 0x00, 0x14, 0x11,
+  0x01, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0xff, 0xda, 0x00, 0x0c, 0x03, 0x01, 0x00,
+  0x02, 0x11, 0x03, 0x11, 0x00, 0x3f, 0x00, 0xe6, 0x40, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0x56,
+  0xc7, 0x68, 0x65, 0xd1, 0x26, 0x57, 0xcc, 0xe8, 0xfa, 0x3d, 0x3c, 0x93,
+  0x39, 0xce, 0x7e, 0x85, 0x2a, 0x7e, 0x14, 0x6a, 0xac, 0x8b, 0x51, 0x3b,
+  0x91, 0x35, 0x2a, 0x31, 0x18, 0x89, 0x9c, 0x76, 0x2a, 0xfd, 0x00, 0xe6,
+  0x01, 0x42, 0x9e, 0xd8, 0xda, 0xab, 0xa3, 0xa8, 0xa0, 0xaa, 0x8d, 0xcd,
+  0x6a, 0xff, 0x00, 0x15, 0x76, 0xd4, 0x89, 0xcf, 0x09, 0xdb, 0xdb, 0xdc,
+  0x5b, 0x4e, 0x13, 0xa7, 0xe8, 0xb0, 0xb5, 0x32, 0xf4, 0x9f, 0x8b, 0x09,
+  0x8e, 0xef, 0xd4, 0x0e, 0x50, 0x1b, 0x6e, 0xb6, 0xc9, 0x6d, 0x93, 0xa4,
+  0x72, 0x2a, 0x3d, 0x8e, 0x4c, 0xb1, 0xe8, 0x98, 0xcf, 0xea, 0x6d, 0xb2,
+  0xd8, 0x16, 0xe1, 0x0f, 0x94, 0x4d, 0x22, 0xc7, 0x12, 0xae, 0x1a, 0x8d,
+  0x4d, 0xdd, 0xe9, 0x5f, 0x56, 0xe0, 0x67, 0xb1, 0xdb, 0xa3, 0xb9, 0xd4,
+  0xbe, 0x29, 0x1e, 0xe6, 0x23, 0x59, 0xab, 0x2d, 0xf6, 0xa1, 0xf9, 0x55,
+  0x6f, 0x8e, 0x1b, 0xe3, 0x68, 0x1a, 0xf7, 0x2b, 0x16, 0x46, 0x33, 0x52,
+  0xf3, 0xeb, 0x63, 0xea, 0x74, 0x76, 0xab, 0x2a, 0xdb, 0x2e, 0x2f, 0x92,
+  0x39, 0x3a, 0x48, 0x5f, 0x1a, 0xa2, 0x2a, 0xf3, 0x6a, 0xe5, 0x36, 0x5f,
+  0x49, 0x12, 0xee, 0xc5, 0x97, 0x8a, 0x56, 0x36, 0xbd, 0x58, 0xaf, 0x92,
+  0x36, 0xa3, 0x9b, 0xcd, 0xb9, 0x46, 0xee, 0x80, 0x78, 0xbf, 0x5a, 0x62,
+  0xb5, 0xf4, 0x1d, 0x14, 0x8f, 0x7f, 0x49, 0xab, 0x3a, 0xb1, 0xb6, 0x31,
+  0xf5, 0x24, 0x96, 0xb8, 0x8a, 0x86, 0x5a, 0x3f, 0x27, 0xe9, 0x2b, 0x26,
+  0xa9, 0xd7, 0xab, 0x1d, 0x22, 0xaa, 0xe9, 0xc6, 0x39, 0x6f, 0xeb, 0x3f,
+  0x6d, 0x1c, 0x3d, 0x25, 0x74, 0x29, 0x51, 0x3c, 0x8b, 0x14, 0x4e, 0x5e,
+  0xaa, 0x22, 0x65, 0xce, 0x4f, 0x4f, 0xa8, 0x08, 0x87, 0xa8, 0xa3, 0x7c,
+  0xd2, 0xb2, 0x28, 0xd3, 0x53, 0xde, 0xa8, 0xd6, 0xa7, 0xa5, 0x54, 0xe9,
+  0x6a, 0xb8, 0x4d, 0xbd, 0x1a, 0xad, 0x25, 0x43, 0xb5, 0xa2, 0x79, 0xb2,
+  0x22, 0x6f, 0xf1, 0x4e, 0x44, 0xbb, 0x03, 0x7a, 0x2b, 0xf4, 0x0c, 0x95,
+  0x34, 0xb9, 0xae, 0x73, 0x55, 0x1d, 0xd8, 0xba, 0x57, 0x6e, 0xf0, 0x2b,
+  0xd3, 0x70, 0x9c, 0x29, 0x1f, 0xef, 0x35, 0x12, 0x39, 0xeb, 0xd9, 0x1e,
+  0x11, 0x13, 0xbd, 0x17, 0x3e, 0x04, 0xbb, 0xcd, 0x8e, 0x4b, 0x6b, 0x52,
+  0x68, 0xde, 0xb2, 0xc0, 0xab, 0x85, 0x5c, 0x61, 0x5a, 0xbe, 0xbf, 0xa9,
+  0x53, 0x8a, 0x22, 0xaf, 0x92, 0x68, 0x3c, 0x99, 0xb2, 0xbe, 0x14, 0x4c,
+  0xe2, 0x24, 0x55, 0xc3, 0xb3, 0xcd, 0x71, 0xf0, 0xc7, 0xc4, 0xd5, 0x77,
+  0x47, 0xb7, 0x86, 0x5c, 0x95, 0x19, 0x59, 0x12, 0x38, 0xd1, 0xfb, 0xe5,
+  0x75, 0x65, 0x3f, 0xd8, 0x11, 0x6c, 0x76, 0x58, 0x6e, 0x74, 0xf2, 0x49,
+  0x24, 0xaf, 0x62, 0xb5, 0xfa, 0x51, 0x1b, 0x8f, 0x41, 0x4b, 0xf6, 0x4e,
+  0x97, 0xfe, 0x44, 0xde, 0x07, 0xef, 0x07, 0x7d, 0x86, 0x7f, 0x7b, 0xfe,
+  0x90, 0xf3, 0x51, 0x64, 0xb9, 0x4b, 0x2c, 0xf2, 0xb2, 0xe0, 0xac, 0xd4,
+  0xf7, 0x39, 0x8c, 0xd6, 0xec, 0x22, 0x2a, 0xed, 0xbf, 0x67, 0x70, 0x10,
+  0xef, 0x54, 0x0c, 0xb7, 0x56, 0x24, 0x11, 0xbd, 0xcf, 0x45, 0x62, 0x3b,
+  0x2e, 0xe7, 0xda, 0x60, 0x3e, 0xf5, 0xac, 0xa8, 0x8a, 0xa5, 0xf1, 0xd5,
+  0xab, 0xd6, 0x56, 0x6c, 0xba, 0x9d, 0x93, 0xe0, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x07, 0x4f, 0xc1, 0x9e, 0x6d, 0x5f, 0xb5, 0x9f,
+  0x98, 0x97, 0x7a, 0xad, 0xa9, 0x75, 0xda, 0xa3, 0x13, 0x48, 0xd4, 0x63,
+  0x95, 0x8d, 0x46, 0xb9, 0x51, 0x11, 0x39, 0x78, 0x95, 0x38, 0x33, 0xcd,
+  0xab, 0xf6, 0xb3, 0xf3, 0x10, 0xee, 0xff, 0x00, 0xcd, 0x6a, 0xfd, 0xeb,
+  0xbe, 0x60, 0x7d, 0x2d, 0x16, 0xea, 0x8b, 0x85, 0x4e, 0x20, 0x7f, 0x47,
+  0xd1, 0xe1, 0xce, 0x93, 0xf0, 0xef, 0xb6, 0x3d, 0x7f, 0x42, 0xe3, 0x38,
+  0x6a, 0x76, 0xd4, 0xa5, 0x42, 0x5c, 0xde, 0xb3, 0x22, 0xe7, 0x5a, 0xc7,
+  0x95, 0xff, 0x00, 0xb1, 0x97, 0x84, 0x2a, 0x62, 0x8a, 0x6a, 0x88, 0x64,
+  0x7a, 0x35, 0xf2, 0xa3, 0x74, 0x65, 0x71, 0x9c, 0x67, 0x6f, 0x6e, 0xe6,
+  0x9a, 0xae, 0x1e, 0xa5, 0x8e, 0xa2, 0x4a, 0xba, 0x9a, 0xd7, 0x36, 0x15,
+  0x72, 0xbd, 0xc8, 0xa9, 0xbe, 0xfb, 0xe3, 0x3f, 0xa0, 0x0e, 0x31, 0x6a,
+  0x79, 0x35, 0x3b, 0xb1, 0xba, 0x3d, 0x53, 0x3f, 0x0f, 0xd0, 0xd8, 0xd7,
+  0x2d, 0x3f, 0x0b, 0xb5, 0xd1, 0x75, 0x1c, 0x94, 0xc8, 0xa8, 0xa9, 0xb6,
+  0x15, 0x53, 0x9f, 0x89, 0x97, 0x8c, 0x7e, 0xc7, 0x07, 0xbc, 0x5f, 0x91,
+  0xf6, 0xb0, 0xd5, 0xc1, 0x5f, 0x6a, 0x4a, 0x39, 0x5c, 0x8b, 0x23, 0x18,
+  0xb1, 0xbd, 0x8b, 0xb2, 0xab, 0x79, 0x22, 0xa7, 0xc3, 0x00, 0x4f, 0xe0,
+  0xf9, 0xa4, 0x5a, 0xa9, 0xe2, 0x57, 0xaa, 0xb1, 0x59, 0xaf, 0x0a, 0xbd,
+  0xb9, 0x4d, 0xfc, 0x4f, 0x8d, 0xc7, 0xef, 0x7b, 0x3d, 0xf4, 0x5f, 0x26,
+  0x97, 0x6d, 0x96, 0xea, 0x2b, 0x6d, 0x53, 0xe2, 0x82, 0x47, 0x3e, 0x67,
+  0xb3, 0x2a, 0x8f, 0x54, 0x55, 0x6b, 0x51, 0x7d, 0x49, 0xb7, 0x3f, 0x02,
+  0x15, 0xc7, 0xef, 0x7b, 0x3d, 0xf4, 0x5f, 0x26, 0x81, 0xab, 0x8c, 0xff,
+  0x00, 0xb3, 0xff, 0x00, 0x3f, 0xca, 0x6f, 0xb8, 0x48, 0xfa, 0x5e, 0x19,
+  0x47, 0x40, 0xf5, 0x63, 0x9b, 0x14, 0x68, 0x8e, 0x45, 0xdd, 0x39, 0x27,
+  0xc8, 0xc1, 0xc6, 0x7f, 0xd9, 0xff, 0x00, 0x9f, 0xe5, 0x36, 0x5a, 0xea,
+  0xa9, 0x2e, 0xd6, 0x96, 0xd1, 0x4c, 0xa9, 0xad, 0x18, 0x8c, 0x7b, 0x35,
+  0x61, 0x57, 0x1c, 0x95, 0x3b, 0x91, 0x40, 0xc5, 0xc2, 0x35, 0x53, 0x3e,
+  0x79, 0xe1, 0x7c, 0x8e, 0x7b, 0x34, 0x23, 0x91, 0x1c, 0xaa, 0xb8, 0x5c,
+  0xf6, 0x77, 0x93, 0x6f, 0xeb, 0xd0, 0xdf, 0xa7, 0x74, 0x5d, 0x47, 0x35,
+  0xcd, 0x72, 0x2a, 0x6d, 0x85, 0xd2, 0x8b, 0x9e, 0xf3, 0xa6, 0xa5, 0xa3,
+  0xa0, 0xb1, 0x43, 0x24, 0x8b, 0x2a, 0xb5, 0x1d, 0xcd, 0xf2, 0xb9, 0x32,
+  0xb8, 0xec, 0x43, 0x8f, 0xb8, 0xd5, 0x2d, 0x6d, 0x74, 0xd5, 0x18, 0xc2,
+  0x3d, 0xdb, 0x22, 0xf6, 0x27, 0x24, 0xf0, 0xc0, 0x1d, 0x1d, 0xa3, 0x88,
+  0x27, 0xad, 0xa8, 0x8a, 0x95, 0xd4, 0xad, 0x73, 0xd7, 0xce, 0x91, 0x1d,
+  0x84, 0x44, 0x4e, 0xdc, 0x63, 0xff, 0x00, 0x29, 0xe3, 0x8b, 0xeb, 0x34,
+  0xc5, 0x15, 0x1b, 0x57, 0x77, 0x2f, 0x48, 0xff, 0x00, 0x67, 0x24, 0xf1,
+  0xcf, 0x71, 0xeb, 0x84, 0xa8, 0xd2, 0x2a, 0x69, 0x2b, 0x5f, 0xb2, 0xc9,
+  0xd5, 0x6a, 0xaf, 0x63, 0x53, 0x9a, 0xf7, 0xfc, 0x8e, 0x7a, 0xe7, 0x56,
+  0xb5, 0xd5, 0xf3, 0x54, 0x7f, 0x4b, 0x9d, 0xd5, 0x4f, 0x43, 0x53, 0x64,
+  0xf0, 0x03, 0x6d, 0x9a, 0xf0, 0xfb, 0x6c, 0x0f, 0x8d, 0xb4, 0xab, 0x32,
+  0x39, 0xda, 0xb3, 0xab, 0x18, 0xdb, 0xd8, 0x6c, 0xb3, 0x5e, 0xab, 0x6a,
+  0xef, 0x2c, 0x8e, 0x59, 0x11, 0x62, 0x97, 0x57, 0x53, 0x09, 0x86, 0xec,
+  0xaa, 0x98, 0x3c, 0xf0, 0xad, 0xce, 0x1a, 0x74, 0x92, 0x92, 0x77, 0xb6,
+  0x34, 0x7b, 0xb5, 0xb1, 0xce, 0xd9, 0x33, 0x8d, 0xd1, 0x57, 0xe0, 0x85,
+  0x88, 0x6d, 0x14, 0x14, 0x55, 0x6f, 0xae, 0x6a, 0xab, 0x15, 0x32, 0xbd,
+  0x67, 0x22, 0x31, 0x99, 0xe6, 0xa8, 0x04, 0x4e, 0x30, 0x6e, 0x2e, 0x31,
+  0x3b, 0xd3, 0x12, 0x27, 0x8a, 0x90, 0x4a, 0x7c, 0x43, 0x5d, 0x1d, 0x7d,
+  0xc5, 0x5f, 0x0e, 0xf1, 0xc6, 0xd4, 0x62, 0x3b, 0xf1, 0x73, 0x5c, 0xf8,
+  0x93, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,
+  0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0xff, 0xd9
+};
+static const unsigned int station_logo_len = sizeof(station_logo);

src/resampler.c

@@ -0,0 +1,52 @@
+/*
+ * mpxgen - FM multiplex encoder with Stereo and RDS
+ * Copyright (C) 2019 Anthony96922
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "common.h"
+#include "resampler.h"
+
+int8_t resampler_init(SRC_STATE **src_state, uint8_t channels) {
+	int src_error;
+
+	*src_state = src_new(CONVERTER_TYPE, channels, &src_error);
+
+	if (*src_state == NULL) {
+		fprintf(stderr, "Error: src_new failed: %s\n", src_strerror(src_error));
+		return -1;
+	}
+
+	return 0;
+}
+
+int8_t resample(SRC_STATE *src_state, SRC_DATA src_data, size_t *frames_generated) {
+	int src_error;
+
+	src_error = src_process(src_state, &src_data);
+
+	if (src_error) {
+		fprintf(stderr, "Error: src_process failed: %s\n", src_strerror(src_error));
+		return -1;
+	}
+
+	*frames_generated = src_data.output_frames_gen;
+
+	return 0;
+}
+
+void resampler_exit(SRC_STATE *src_state) {
+	src_delete(src_state);
+}

src/resampler.h

@@ -0,0 +1,25 @@
+/*
+ * mpxgen - FM multiplex encoder with Stereo and RDS
+ * Copyright (C) 2019 Anthony96922
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <samplerate.h>
+
+#define CONVERTER_TYPE SRC_SINC_MEDIUM_QUALITY
+
+extern int8_t resampler_init(SRC_STATE **src_state, uint8_t channels);
+extern int8_t resample(SRC_STATE *src_state, SRC_DATA src_data, size_t *frames_generated);
+extern void resampler_exit(SRC_STATE *src_state);

src/supported_cmds.txt

@@ -0,0 +1,27 @@
+AF - Mode A only
+AFCH - Mode A only
+DI
+MS
+PI
+PS
+TPS
+PTY
+PTYN
+PTYNEN
+TEXT | RT1
+RT1EN
+TA
+TP
+CT
+LEVEL - Not redecommended, if possible use `MPX`
+RDSGEN
+ECC
+ECCEN
+G
+LIC
+PIN
+PINEN
+RTP
+RTPRUN
+
+(Magic RDS 3 'Program' page is fully supported.)

src/todo.txt

@@ -0,0 +1,26 @@
+Current TODO for RDS encoding:
+- UECP Decoding
+- Dynamic PS (may not be implemented)
+- Bidirectionality
+
+ASCII commands to implement:
+- Group sequence
+- Short RT
+
+ASCII Group seqeunce:
+0 - Four 0As (PS x 4)
+1 - 1A (ECC/LIC, PIN)
+2 - 2A (RT)
+A - 10A (PTYN)
+E - 14A 14B (EON, yet to implement)
+X - UDG1 (yet to implement, max 8 groups per udg)
+Y - UDG2 (yet to implement)
+R - RT+ 3A 11A (do i switch between them like ecc lic?)
+F - 15A (LPS)
+Max 24 items in a sequence.
+
+Note that most of this is takes out of pira.cz's P164 RDS Encoder's manual: https://pira.cz/rds/p164man.pdf
+
+I plan for this's commands to be similiar to PIRA32's or P164's (both are made by pira.cz)
+
+In theory, now you can use the MiniRDS as a PIRA32 type device in Magic RDS 4 (but not everything is supported)

src/uecp_rds_todo.txt

@@ -0,0 +1,21 @@
+This aims to have the around the same options as UECP should have, this is what is not yet implemented:
+- PIN (low priority, how do i decode that?)
+- EON AF (very low priority)
+- Linkage information (very low priority)
+- (ODA skipped)
+- TDC (low priority)
+- EWS (how do i even implement that? can someone give docs?)
+- IH (low priority)
+- (Paging skipped)
+- (No CT time adjustments)
+- RDS on/off (low priority)
+- RDS phase (might be medium, 9.5 degree steps)
+- (ARI skipped)
+
+Others:
+- Encoder identification (site and encoder address)
+- (PSN skipped)
+- (EON skipped)
+- Data set select
+- Group sequence
+- (other sequence related comamnds skipped)

src/waveforms.h

@@ -0,0 +1,7 @@
+
+/* This file was automatically generated by "generate_waveforms.py".
+   (C) 2014 Christophe Jacquet.
+   Released under the GNU GPL v3 license.
+ */
+
+extern float waveform_biphase[1120];