streamplayer.c File Reference

A utility for reading from a raw TCP stream. More...

#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <netdb.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/time.h>

Include dependency graph for streamplayer.c:

Go to the source code of this file.

Functions
int	main (int argc, char *argv[])

Detailed Description

A utility for reading from a raw TCP stream.

Author

Russell Bryant russe.nosp@m.ll@d.nosp@m.igium.nosp@m..com

This application is intended for use when a raw TCP stream is desired to be used as a music on hold source for Asterisk. Some devices are capable of taking some kind of audio input and provide it as a raw TCP stream over the network, which is what inspired someone to fund this to be written. However, it would certainly be possible to write your own server application to provide music over a TCP stream from a centralized location.

This application is quite simple. It just reads the data from the TCP stream and dumps it straight to stdout. Due to the way Asterisk handles music on hold sources, this application checks to make sure writing to stdout will not be a blocking operation before doing so. If so, the data is just thrown away. This ensures that the stream will continue to be serviced, even if Asterisk is not currently using the source.

Todo:

Update this application to be able to connect to a stream via HTTP, since that is the #1 most requested feature, and it would be quite useful. A lot of people think that is what this is for and email me when it does not work. :)

Definition in file streamplayer.c.

Function Documentation

main()

int main	(	int	argc,
		char *	argv[]
	)

Definition at line 62 of file streamplayer.c.

{
    struct sockaddr_in sin;
    struct hostent *hp;
    int s;
    int res;
    char buf[2048];
    fd_set wfds;
    struct timeval tv;
 
    if (argc != 3) {
        fprintf(stderr, "streamplayer -- A utility for reading from a raw TCP stream.\n");
        fprintf(stderr, "Written for use with Asterisk (http://www.asterisk.org)\n");
        fprintf(stderr, "Copyright (C) 2005 -- Russell Bryant -- Digium, Inc.\n\n");
        fprintf(stderr, "Usage: ./streamplayer <ip> <port>\n");
        exit(1);
    }
 
    hp = gethostbyname(argv[1]);
    if (!hp) {
        fprintf(stderr, "Unable to lookup IP for host '%s'\n", argv[1]);
        exit(1);
    }
 
    memset(&sin, 0, sizeof(sin));
 
    sin.sin_family = AF_INET;
    sin.sin_port = htons(atoi(argv[2]));
    memcpy(&sin.sin_addr, hp->h_addr, sizeof(sin.sin_addr));
 
    s = socket(AF_INET, SOCK_STREAM, 0);
 
    if (s < 0) {
        fprintf(stderr, "Unable to allocate socket!\n");
        exit(1);
    }
 
    res = connect(s, (struct sockaddr *)&sin, sizeof(sin));
 
    if (res) {
        fprintf(stderr, "Unable to connect to host!\n");
        close(s);
        exit(1);
    }
 
    while (1) {
        res = read(s, buf, sizeof(buf));
 
        if (res < 1)
            break;
 
        memset(&tv, 0, sizeof(tv));
        FD_ZERO(&wfds);
        FD_SET(1, &wfds);
 
        select(2, NULL, &wfds, NULL, &tv);
 
        if (FD_ISSET(1, &wfds)) {
            if (write(1, buf, res) < 1) {
                break;
            }
        }
    }
 
    close(s);
    exit(res);
}

References buf, FD_SET, FD_ZERO, gethostbyname, and NULL.