cc86329228
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
114 lines
2.7 KiB
C
114 lines
2.7 KiB
C
/*
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* Asterisk -- An open source telephony toolkit.
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*
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* Copyright (C) 1999 - 2005, Digium, Inc.
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*
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* Mark Spencer <markster@digium.com>
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*
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* See http://www.asterisk.org for more information about
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* the Asterisk project. Please do not directly contact
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* any of the maintainers of this project for assistance;
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* the project provides a web site, mailing lists and IRC
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* channels for your use.
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*
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* This program is free software, distributed under the terms of
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* the GNU General Public License Version 2. See the LICENSE file
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* at the top of the source tree.
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*/
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/*! \file
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*
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* \brief Echo application -- play back what you hear to evaluate latency
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*
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* \author Mark Spencer <markster@digium.com>
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*
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* \ingroup applications
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*/
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/*** MODULEINFO
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<support_level>core</support_level>
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***/
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#include "asterisk.h"
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#include "asterisk/file.h"
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#include "asterisk/module.h"
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#include "asterisk/channel.h"
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/*** DOCUMENTATION
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<application name="Echo" language="en_US">
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<synopsis>
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Echo media, DTMF back to the calling party
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</synopsis>
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<syntax />
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<description>
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<para>Echos back any media or DTMF frames read from the calling
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channel back to itself. This will not echo CONTROL, MODEM, or NULL
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frames. Note: If '#' detected application exits.</para>
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<para>This application does not automatically answer and should be
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preceeded by an application such as Answer() or Progress().</para>
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</description>
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</application>
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***/
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static const char app[] = "Echo";
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static int echo_exec(struct ast_channel *chan, const char *data)
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{
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int res = -1;
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int fir_sent = 0;
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while (ast_waitfor(chan, -1) > -1) {
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struct ast_frame *f = ast_read(chan);
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if (!f) {
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break;
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}
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f->delivery.tv_sec = 0;
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f->delivery.tv_usec = 0;
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if (f->frametype == AST_FRAME_CONTROL
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&& f->subclass.integer == AST_CONTROL_VIDUPDATE
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&& !fir_sent) {
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if (ast_write(chan, f) < 0) {
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ast_frfree(f);
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goto end;
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}
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fir_sent = 1;
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}
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if (!fir_sent && f->frametype == AST_FRAME_VIDEO) {
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struct ast_frame frame = {
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.frametype = AST_FRAME_CONTROL,
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.subclass.integer = AST_CONTROL_VIDUPDATE,
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};
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ast_write(chan, &frame);
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fir_sent = 1;
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}
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if (f->frametype != AST_FRAME_CONTROL
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&& f->frametype != AST_FRAME_MODEM
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&& f->frametype != AST_FRAME_NULL
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&& ast_write(chan, f)) {
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ast_frfree(f);
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goto end;
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}
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if ((f->frametype == AST_FRAME_DTMF) && (f->subclass.integer == '#')) {
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res = 0;
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ast_frfree(f);
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goto end;
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}
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ast_frfree(f);
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}
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end:
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return res;
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}
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static int unload_module(void)
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{
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return ast_unregister_application(app);
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}
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static int load_module(void)
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{
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return ast_register_application_xml(app, echo_exec);
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}
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AST_MODULE_INFO_STANDARD(ASTERISK_GPL_KEY, "Simple Echo Application");
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