/* * 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"> <since> <version>0.1.2</version> </since> <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");