video tweaks for echo app

src/switch_ivr_async.c

@@ -580,11 +580,24 @@ static void *SWITCH_THREAD_FUNC echo_video_thread(switch_thread_t *thread, void
 	switch_channel_t *channel = switch_core_session_get_channel(session);
 	switch_status_t status;
 	switch_frame_t *read_frame;
+	switch_core_session_message_t msg = { 0 };
+
+
+	msg.from = __FILE__;
+	msg.message_id = SWITCH_MESSAGE_INDICATE_VIDEO_REFRESH_REQ;
+	
+	switch_core_session_receive_message(session, &msg);
 
 	eh->up = 1;
 	while (switch_channel_ready(channel)) {
 		status = switch_core_session_read_video_frame(session, &read_frame, SWITCH_IO_FLAG_NONE, 0);
 
+
+		if (switch_channel_test_flag(channel, CF_VIDEO_REFRESH_REQ)) {
+			switch_core_session_receive_message(session, &msg);
+			switch_channel_clear_flag(channel, CF_VIDEO_REFRESH_REQ);
+		}
+
 		if (!SWITCH_READ_ACCEPTABLE(status)) {
 			break;
 		}
@@ -606,6 +619,8 @@ SWITCH_DECLARE(void) switch_ivr_session_echo(switch_core_session_t *session, swi
 	switch_status_t status;
 	switch_frame_t *read_frame;
 	switch_channel_t *channel = switch_core_session_get_channel(session);
+	int orig_vid = switch_channel_test_flag(channel, CF_VIDEO);
+
 #ifdef SWITCH_VIDEO_IN_THREADS
 	struct echo_helper eh = { 0 };
 	switch_thread_t *thread;
@@ -615,6 +630,9 @@ SWITCH_DECLARE(void) switch_ivr_session_echo(switch_core_session_t *session, swi
 	if (switch_channel_pre_answer(channel) != SWITCH_STATUS_SUCCESS) {
 		return;
 	}
+
+ restart:
+
 #ifdef SWITCH_VIDEO_IN_THREADS
 	if (switch_channel_test_flag(channel, CF_VIDEO)) {
 		eh.session = session;
@@ -630,6 +648,12 @@ SWITCH_DECLARE(void) switch_ivr_session_echo(switch_core_session_t *session, swi
 		if (!SWITCH_READ_ACCEPTABLE(status)) {
 			break;
 		}
+		
+		if (!orig_vid && switch_channel_test_flag(channel, CF_VIDEO)) {
+			orig_vid = 1;
+			goto restart;
+		}
+
 
 		switch_ivr_parse_all_events(session);