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This patch is part of an effort to document early media and its usage. If you are interested in contributing to this documentation effort, there are probably other applications worth documenting as well as an Asterisk wiki article at https://wiki.asterisk.org/wiki/display/AST/Early+Media+and+the+Progress+Application git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/1.8@336716 65c4cc65-6c06-0410-ace0-fbb531ad65f3
99 lines
2.3 KiB
C
99 lines
2.3 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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ASTERISK_FILE_VERSION(__FILE__, "$Revision$")
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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 audio, video, 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 audio, video or DTMF frames read from the calling
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channel back to itself. 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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format_t format;
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format = ast_best_codec(chan->nativeformats);
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ast_set_write_format(chan, format);
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ast_set_read_format(chan, format);
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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 (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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