FS-7500: major refactoring pass. Push concepts from mod_vlc as deep as possible and flesh out api to use everywhere else. Round 2 will be to convert the bridge and other places using the same code

src/include/private/switch_core_pvt.h

@@ -190,6 +190,10 @@ struct switch_core_session {
 	uint32_t decoder_errors;
 	switch_core_video_thread_callback_func_t *_video_thread_callback;
 	void *_video_thread_user_data;
+	//switch_time_t last_video_write_time;
+	
+	switch_image_write_callback_t image_write_callback;
+	void *image_write_callback_user_data;
 };
 
 struct switch_media_bug {