apps/app_echo.c

   1 /*
   2  * Asterisk -- An open source telephony toolkit.
   3  *
   4  * Copyright (C) 1999 - 2005, Digium, Inc.
   5  *
   6  * Mark Spencer <markster@digium.com>
   7  *
   8  * See http://www.asterisk.org for more information about
   9  * the Asterisk project. Please do not directly contact
  10  * any of the maintainers of this project for assistance;
  11  * the project provides a web site, mailing lists and IRC
  12  * channels for your use.
  13  *
  14  * This program is free software, distributed under the terms of
  15  * the GNU General Public License Version 2. See the LICENSE file
  16  * at the top of the source tree.
  17  */
  18
  19 /*! \file
  20  *
  21  * \brief Echo application -- play back what you hear to evaluate latency
  22  *
  23  * \author Mark Spencer <markster@digium.com>
  24  *
  25  * \ingroup applications
  26  */
  27
  28 #include "asterisk.h"
  29
  30 ASTERISK_FILE_VERSION(__FILE__, "$Revision$")
  31
  32 #include <stdlib.h>
  33 #include <stdio.h>
  34 #include <unistd.h>
  35 #include <string.h>
  36
  37 #include "asterisk/lock.h"
  38 #include "asterisk/file.h"
  39 #include "asterisk/logger.h"
  40 #include "asterisk/channel.h"
  41 #include "asterisk/pbx.h"
  42 #include "asterisk/module.h"
  43
  44 static char *app = "Echo";
  45
  46 static char *synopsis = "Echo audio, video, or DTMF back to the calling party";
  47
  48 static char *descrip =
  49 "  Echo(): This application will echo any audio, video, or DTMF frames read from\n"
  50 "the calling channel back to itself. If the DTMF digit '#' is received, the\n"
  51 "application will exit.\n";
  52
  53
  54 static int echo_exec(struct ast_channel *chan, void *data)
  55 {
  56         int res = -1;
  57         int format;
  58         struct ast_module_user *u;
  59
  60         u = ast_module_user_add(chan);
  61
  62         format = ast_best_codec(chan->nativeformats);
  63         ast_set_write_format(chan, format);
  64         ast_set_read_format(chan, format);
  65
  66         while (ast_waitfor(chan, -1) > -1) {
  67                 struct ast_frame *f = ast_read(chan);
  68                 if (!f)
  69                         break;
  70                 f->delivery.tv_sec = 0;
  71                 f->delivery.tv_usec = 0;
  72                 if (ast_write(chan, f)) {
  73                         ast_frfree(f);
  74                         goto end;
  75                 }
  76                 if ((f->frametype == AST_FRAME_DTMF) && (f->subclass == '#')) {
  77                         res = 0;
  78                         ast_frfree(f);
  79                         goto end;
  80                 }
  81                 ast_frfree(f);
  82         }
  83 end:
  84         ast_module_user_remove(u);
  85         return res;
  86 }
  87
  88 static int unload_module(void)
  89 {
  90         int res;
  91
  92         res = ast_unregister_application(app);
  93
  94         ast_module_user_hangup_all();
  95
  96         return res;
  97 }
  98
  99 static int load_module(void)
 100 {
 101         return ast_register_application(app, echo_exec, synopsis, descrip);
 102 }
 103
 104 AST_MODULE_INFO_STANDARD(ASTERISK_GPL_KEY, "Simple Echo Application");