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                 switch (f->frametype) {
  73                 case AST_FRAME_DTMF:
  74                         if (f->subclass == '#') {
  75                                 res = 0;
  76                                 ast_frfree(f);
  77                                 goto end;
  78                         }
  79                         /* fall through */
  80                 default:
  81                         if (ast_write(chan, f)) {
  82                                 ast_frfree(f);
  83                                 goto end;
  84                         }
  85                 }
  86                 ast_frfree(f);
  87         }
  88 end:
  89         ast_module_user_remove(u);
  90         return res;
  91 }
  92
  93 static int unload_module(void)
  94 {
  95         int res;
  96
  97         res = ast_unregister_application(app);
  98
  99         ast_module_user_hangup_all();
 100
 101         return res;
 102 }
 103
 104 static int load_module(void)
 105 {
 106         return ast_register_application(app, echo_exec, synopsis, descrip);
 107 }
 108
 109 AST_MODULE_INFO_STANDARD(ASTERISK_GPL_KEY, "Simple Echo Application");