From 9cb255a8bdf93bdeb209a97013fed354acd127ee Mon Sep 17 00:00:00 2001
From: KubaPro010 <kuba.pro010@gmail.com>
Date: Sun, 13 Apr 2025 16:06:50 +0200
Subject: [PATCH] add fast tuning information

---
 src/rds.c | 20 ++++++++++++++++++++
 src/rds.h |  2 ++
 2 files changed, 22 insertions(+)

diff --git a/src/rds.c b/src/rds.c
index b03d655..c38a1df 100644
--- a/src/rds.c
+++ b/src/rds.c
@@ -173,6 +173,22 @@ static void get_rds_ps_group(RDSEncoder* enc, RDSGroup *group) {
 	if (enc->state[enc->program].ps_csegment == 4) enc->state[enc->program].ps_csegment = 0;
 }
 
+static void get_rds_fasttuning_group(RDSEncoder* enc, RDSGroup *group) {
+	group.b |= 1 << 11;
+
+	group->b |= enc->data[enc->program].ta << 4;
+	if(enc->state[enc->program].fasttuning_state == 0) group->b |= enc->data[enc->program].dpty << 2;
+	group->b |= enc->state[enc->program].fasttuning_state;
+
+	// are blocks b and d the same or not?
+	group->d = group->b;
+
+	enc->state[enc->program].fasttuning_state++;
+	if (enc->state[enc->program].fasttuning_state == 4) enc->state[enc->program].fasttuning_state = 0;
+
+	group->is_type_b = 1;
+}
+
 static void get_rds_rt_group(RDSEncoder* enc, RDSGroup *group) {
 	if (enc->state[enc->program].rt_update && enc->data[enc->program].rt1_enabled && !enc->state[enc->program].current_rt) {
 		memcpy(enc->state[enc->program].rt_text, enc->data[enc->program].rt1, RT_LENGTH);
@@ -482,6 +498,9 @@ static void get_rds_sequence_group(RDSEncoder* enc, RDSGroup *group, char* grp,
 		case 'F':
 			get_rds_lps_group(enc, group);
 			goto group_coded;
+		case 'T':
+			get_rds_fasttuning_group(enc, group);
+			goto group_coded;
 	}
 group_coded:
 	return;
@@ -507,6 +526,7 @@ static uint8_t check_rds_good_group(RDSEncoder* enc, char* grp, uint8_t stream)
 	if(*grp == 'R' && enc->rtpData[enc->program].enabled) good_group = 1;
 	if(*grp == 'S' && enc->data[enc->program].ert[0] != '\0') good_group = 1;
 	if(*grp == 'F' && enc->data[enc->program].lps[0] != '\0') good_group = 1;
+	if(*grp == 'T') good_group = 1;
 	return good_group;
 }
 
diff --git a/src/rds.h b/src/rds.h
index b244df1..f0f2320 100644
--- a/src/rds.h
+++ b/src/rds.h
@@ -143,6 +143,8 @@ typedef struct {
 	uint8_t data_ecc : 1;
 	uint8_t grp_seq_idx[4];
 	uint8_t udg_idxs[2];
+	
+	uint8_t fasttuning_state : 3;
 
 	uint8_t last_minute : 6;
 	uint8_t ta_timeout : 7;