[Asterisk-code-review] apps/app echo: Only relay a single video source change frame (asterisk[13])

[Matt Jordan]

Matt Jordan has uploaded a new change for review. ( https://gerrit.asterisk.org/4432 )

Change subject: apps/app_echo: Only relay a single video source change frame
......................................................................

apps/app_echo: Only relay a single video source change frame

In 9785e8d0, app_echo was updated to relay video source updates to the
channel for the purposes of displaying video in WebRTC tests.
Unfortunately, this can cause a Kafkaesque nightmare if two or more
Local channels are in a bridge together where their ends are in
app_echo. When this situation occurs, a video update sent into app_echo
will cause the video update to be relayed to the other Local channels,
causing another round of video updates, etc. In not much time at all,
the channel length queues will be overwhelmed, channel alert pipes will
fail, and all hell will break loose as Asterisk merrily continues to
throw more video update requests onto the channels.

This patch updates app_echo to *only* relay a single video update. Once
a video update has been made, all further video updates are dropped.
This meets the intended purpose of the original patch: if we get a video
update and we're in app_echo, go ahead and ask the sender to update
themselves. However, once we've got that video stream sync'd up, don't
keep spamming the world.

Change-Id: I9210780b08d4c17ddb38599d1c64453adfc34f74
---
M apps/app_echo.c
1 file changed, 2 insertions(+), 1 deletion(-)


  git pull ssh://gerrit.asterisk.org:29418/asterisk refs/changes/32/4432/1

diff --git a/apps/app_echo.c b/apps/app_echo.c
index c6e37db..9146078 100644
--- a/apps/app_echo.c
+++ b/apps/app_echo.c
@@ -68,7 +68,8 @@
 		f->delivery.tv_sec = 0;
 		f->delivery.tv_usec = 0;
 		if (f->frametype == AST_FRAME_CONTROL
-			&& f->subclass.integer == AST_CONTROL_VIDUPDATE) {
+			&& f->subclass.integer == AST_CONTROL_VIDUPDATE
+			&& !fir_sent) {
 			if (ast_write(chan, f) < 0) {
 				ast_frfree(f);
 				goto end;

-- 
To view, visit https://gerrit.asterisk.org/4432
To unsubscribe, visit https://gerrit.asterisk.org/settings

Gerrit-MessageType: newchange
Gerrit-Change-Id: I9210780b08d4c17ddb38599d1c64453adfc34f74
Gerrit-PatchSet: 1
Gerrit-Project: asterisk
Gerrit-Branch: 13
Gerrit-Owner: Matt Jordan <mjordan at digium.com>