refactor fmtp parser as a core func

src/include/switch_core.h

@@ -1351,6 +1351,7 @@ SWITCH_DECLARE(switch_status_t) switch_core_codec_init_with_bitrate(switch_codec
 													   uint32_t flags, const switch_codec_settings_t *codec_settings, switch_memory_pool_t *pool);
 
 SWITCH_DECLARE(switch_status_t) switch_core_codec_copy(switch_codec_t *codec, switch_codec_t *new_codec, switch_memory_pool_t *pool);
+SWITCH_DECLARE(switch_status_t) switch_core_codec_parse_fmtp(const char *codec_name, const char *fmtp, uint32_t rate, switch_codec_fmtp_t *codec_fmtp);
 SWITCH_DECLARE(switch_status_t) switch_core_codec_reset(switch_codec_t *codec);
 
 /*! 

src/mod/endpoints/mod_sofia/sofia_glue.c

@@ -4152,6 +4152,7 @@ uint8_t sofia_glue_negotiate_sdp(switch_core_session_t *session, const char *r_s
 				const char *rm_encoding;
 				uint32_t map_bit_rate = 0;
 				int codec_ms = 0;
+				switch_codec_fmtp_t codec_fmtp = { 0 };
 
 				if (x++ < skip) {
 					continue;
@@ -4197,9 +4198,18 @@ uint8_t sofia_glue_negotiate_sdp(switch_core_session_t *session, const char *r_s
 
 				map_bit_rate = switch_known_bitrate(map->rm_pt);
 
-				if (!codec_ms) {
-					codec_ms = ptime;
+				if (!zstr(map->rm_fmtp)) {
+					if ((switch_core_codec_parse_fmtp(map->rm_encoding, map->rm_fmtp, map->rm_rate, &codec_fmtp)) == SWITCH_STATUS_SUCCESS) {
+						if (codec_fmtp.bits_per_second) {
+							map_bit_rate = codec_fmtp.bits_per_second;
+						}
+						if (codec_fmtp.microseconds_per_packet) {
+							ptime = (codec_fmtp.microseconds_per_packet / 1000);
+						}
 					}
+				}
+				
+				codec_ms = ptime;
 
 				for (i = first; i < last && i < tech_pvt->num_codecs; i++) {
 					const switch_codec_implementation_t *imp = tech_pvt->codecs[i];

src/switch_core_codec.c

@@ -450,6 +450,28 @@ SWITCH_DECLARE(switch_codec_t *) switch_core_session_get_video_write_codec(switc
 
 }
 
+SWITCH_DECLARE(switch_status_t) switch_core_codec_parse_fmtp(const char *codec_name, const char *fmtp, uint32_t rate, switch_codec_fmtp_t *codec_fmtp)
+{
+	switch_codec_interface_t *codec_interface;
+	switch_status_t status = SWITCH_STATUS_FALSE;
+	
+	if (zstr(codec_name) || zstr(fmtp) || !codec_fmtp) {
+		return SWITCH_STATUS_FALSE;
+	}
+
+	memset(codec_fmtp, 0, sizeof(*codec_fmtp));
+	
+	if ((codec_interface = switch_loadable_module_get_codec_interface(codec_name))) {
+		if (codec_interface->parse_fmtp) {
+			codec_fmtp->actual_samples_per_second = rate;
+			status = codec_interface->parse_fmtp(fmtp, codec_fmtp);
+		}
+
+		UNPROTECT_INTERFACE(codec_interface);
+	}
+
+	return status;
+}
 
 SWITCH_DECLARE(switch_status_t) switch_core_codec_reset(switch_codec_t *codec)
 {