FS-7500: add force flag

src/include/switch_types.h

@@ -1769,7 +1769,8 @@ typedef uint32_t switch_file_flag_t;
 typedef enum {
 	SWITCH_IO_FLAG_NONE = 0,
 	SWITCH_IO_FLAG_NOBLOCK = (1 << 0),
-	SWITCH_IO_FLAG_SINGLE_READ = (1 << 1)
+	SWITCH_IO_FLAG_SINGLE_READ = (1 << 1),
+	SWITCH_IO_FLAG_FORCE = (1 << 2)
 } switch_io_flag_enum_t;
 typedef uint32_t switch_io_flag_t;
 

src/switch_core_media.c

@@ -4763,7 +4763,7 @@ static void *SWITCH_THREAD_FUNC video_helper_thread(switch_thread_t *thread, voi
 			switch_mutex_unlock(mh->file_mutex);
 		} else if (switch_channel_test_flag(channel, CF_VIDEO_DECODED_READ)) {
 			fr.img = blank_img;
-			switch_core_session_write_video_frame(session, &fr, SWITCH_IO_FLAG_NONE, 0);
+			switch_core_session_write_video_frame(session, &fr, SWITCH_IO_FLAG_NONE, SWITCH_IO_FLAG_FORCE);
 		}
 
 		if (read_frame && (switch_channel_test_flag(channel, CF_VIDEO_ECHO))) {
@@ -10037,6 +10037,10 @@ SWITCH_DECLARE(switch_status_t) switch_core_session_write_video_frame(switch_cor
 		return SWITCH_STATUS_SUCCESS;
 	}
 
+	if (!(switch_channel_test_flag(session->channel, CF_VIDEO_READY) || (flags & SWITCH_IO_FLAG_FORCE))) {
+		return SWITCH_STATUS_SUCCESS;
+	}
+
 	if (!smh->video_init && smh->mparams->video_key_first && (now - smh->video_last_key_time) > smh->mparams->video_key_first) {
 		switch_core_media_gen_key_frame(session);