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src/fm_mpx.h

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+/*
+ * 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);