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