FS-7500: add support for codec control and use it to pass messages down to the codec and use it to implement keyframe reset for fir, pli and nack. Later we will expand to handle nack correctly.

src/include/switch_core_media.h

@@ -294,6 +294,17 @@ SWITCH_DECLARE(const char *) switch_core_media_crypto_type2str(switch_rtp_crypto
 SWITCH_DECLARE(int) switch_core_media_crypto_keylen(switch_rtp_crypto_key_type_t type);
 SWITCH_DECLARE(char *) switch_core_media_filter_sdp(const char *sdp, const char *cmd, const char *arg);
 SWITCH_DECLARE(char *) switch_core_media_process_sdp_filter(const char *sdp, const char *cmd_buf, switch_core_session_t *session);
+
+
+SWITCH_DECLARE(switch_status_t) switch_core_media_codec_control(switch_core_session_t *session, 
+																switch_media_type_t mtype,
+																switch_io_type_t iotype,
+																switch_codec_control_command_t cmd, 
+																switch_codec_control_type_t ctype,
+																void *cmd_data,
+																switch_codec_control_type_t *rtype,
+																void **ret_data);
+
 SWITCH_END_EXTERN_C
 #endif
 /* For Emacs: