utils/streamplayer.c

   1 /*
   2  * Asterisk -- An open source telephony toolkit.
   3  *
   4  * Copyright (C) 1999 - 2005, Digium, Inc.
   5  *
   6  * Russell Bryant <russell@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 /*!
  20  * \file
  21  * \author Russell Bryant <russell@digium.com>
  22  *
  23  * \brief A utility for reading from a raw TCP stream
  24  *
  25  * This application is intended for use when a raw TCP stream is desired to be
  26  * used as a music on hold source for Asterisk.  Some devices are capable of
  27  * taking some kind of audio input and provide it as a raw TCP stream over the
  28  * network, which is what inspired someone to fund this to be written.
  29  * However, it would certainly be possible to write your own server application
  30  * to provide music over a TCP stream from a centralized location.
  31  *
  32  * This application is quite simple.  It just reads the data from the TCP
  33  * stream and dumps it straight to stdout.  Due to the way Asterisk handles
  34  * music on hold sources, this application checks to make sure writing
  35  * to stdout will not be a blocking operation before doing so.  If so, the data
  36  * is just thrown away.  This ensures that the stream will continue to be
  37  * serviced, even if Asterisk is not currently using the source.
  38  *
  39  * \todo Update this application to be able to connect to a stream via HTTP,
  40  * since that is the #1 most requested feature, and it would be quite useful.
  41  * A lot of people think that is what this is for and email me when it does
  42  * not work.  :)
  43  */
  44
  45 #include <stdlib.h>
  46 #include <stdio.h>
  47 #include <string.h>
  48 #include <netdb.h>
  49 #include <unistd.h>
  50 #include <sys/types.h>
  51 #include <sys/socket.h>
  52 #if defined(__FreeBSD__) || defined(__OpenBSD__) || defined(__NetBSD__) || defined(__Darwin__) || defined(__CYGWIN__)
  53 #include <netinet/in.h>
  54 #endif
  55 #include <sys/time.h>
  56
  57
  58 int main(int argc, char *argv[])
  59 {
  60         struct sockaddr_in sin;
  61         struct hostent *hp;
  62         int s;
  63         int res;
  64         char buf[2048];
  65         fd_set wfds;
  66         struct timeval tv;
  67
  68         if (argc != 3) {
  69                 fprintf(stderr, "streamplayer -- A utility for reading from a raw TCP stream.\n");
  70                 fprintf(stderr, "Written for use with Asterisk (http://www.asterisk.org)\n");
  71                 fprintf(stderr, "Copyright (C) 2005 -- Russell Bryant -- Digium, Inc.\n\n");
  72                 fprintf(stderr, "Usage: ./streamplayer <ip> <port>\n");
  73                 exit(1);
  74         }
  75
  76         hp = gethostbyname(argv[1]);
  77         if (!hp) {
  78                 fprintf(stderr, "Unable to lookup IP for host '%s'\n", argv[1]);
  79                 exit(1);
  80         }
  81
  82         memset(&sin, 0, sizeof(sin));
  83
  84         sin.sin_family = AF_INET;
  85         sin.sin_port = htons(atoi(argv[2]));
  86         memcpy(&sin.sin_addr, hp->h_addr, sizeof(sin.sin_addr));
  87
  88         s = socket(AF_INET, SOCK_STREAM, 0);
  89
  90         if (s < 0) {
  91                 fprintf(stderr, "Unable to allocate socket!\n");
  92                 exit(1);
  93         }
  94
  95         res = connect(s, (struct sockaddr *)&sin, sizeof(sin));
  96
  97         if (res) {
  98                 fprintf(stderr, "Unable to connect to host!\n");
  99                 close(s);
 100                 exit(1);
 101         }
 102
 103         while (1) {
 104                 res = read(s, buf, sizeof(buf));
 105
 106                 if (res < 1)
 107                         break;
 108
 109                 memset(&tv, 0, sizeof(tv));
 110                 FD_ZERO(&wfds);
 111                 FD_SET(1, &wfds);
 112
 113                 select(2, NULL, &wfds, NULL, &tv);
 114
 115                 if (FD_ISSET(1, &wfds))
 116                         write(1, buf, res);
 117         }
 118
 119         close(s);
 120         exit(res);
 121 }