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/mod/codecs/mod_openh264/mod_openh264.cpp

@@ -533,6 +533,16 @@ end:
 	return SWITCH_STATUS_SUCCESS;
 }
 
+static switch_status_t switch_h264_control(switch_codec_t *codec, 
+										   switch_codec_control_command_t cmd, 
+										   switch_codec_control_type_t ctype,
+										   void *cmd_data,
+										   switch_codec_control_type_t *rtype,
+										   void **ret_data) {
+
+	return SWITCH_STATUS_SUCCESS;
+}
+
 static switch_status_t switch_h264_destroy(switch_codec_t *codec)
 {
 	h264_codec_context_t *context = (h264_codec_context_t *)codec->private_info;
@@ -565,7 +575,7 @@ SWITCH_MODULE_LOAD_FUNCTION(mod_openh264_load)
 
 	SWITCH_ADD_CODEC(codec_interface, "H264 Video (with Cisco OpenH264)");
 	switch_core_codec_add_video_implementation(pool, codec_interface, 99, "H264", NULL,
-		switch_h264_init, switch_h264_encode, switch_h264_decode, switch_h264_destroy);
+											   switch_h264_init, switch_h264_encode, switch_h264_decode, switch_h264_control, switch_h264_destroy);
 
 	/* indicate that the module should continue to be loaded */
 	return SWITCH_STATUS_SUCCESS;