streamutil.c

基于sip协议的网络电话源码

/* $Id: streamutil.c 974 2007-02-19 01:13:53Z bennylp $ */
/* 
 * Copyright (C) 2003-2007 Benny Prijono <[e-mail]>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA 
 */


/**
 * \page page_pjmedia_samples_streamutil_c Samples: Remote Streaming
 *
 * This example mainly demonstrates how to stream media file to remote
 * peer using RTP.
 *
 * This file is pjsip-apps/src/samples/streamutil.c
 *
 * \includelineno streamutil.c
 */


static const char *desc = 
 " streamutil								\n"
 "									\n"
 " PURPOSE:								\n"
 "  Demonstrate how to use pjmedia stream component to transmit/receive \n"
 "  RTP packets to/from sound device.		    			\n"
 "\n"
 "\n"
 " USAGE:								\n"
 "  streamutil [options]                                                \n"
 "\n"
 "\n"
 " Options:\n"
 "  --codec=CODEC         Set the codec name.                           \n"
 "  --local-port=PORT     Set local RTP port (default=4000)		\n"
 "  --remote=IP:PORT      Set the remote peer. If this option is set,	\n"
 "                        the program will transmit RTP audio to the	\n"
 "                        specified address. (default: recv only)	\n"
 "  --play-file=WAV       Send audio from the WAV file instead of from	\n"
 "                        the sound device.				\n"
 "  --record-file=WAV     Record incoming audio to WAV file instead of	\n"
 "                        playing it to sound device.			\n"
 "  --send-recv           Set stream direction to bidirectional.        \n"
 "  --send-only           Set stream direction to send only		\n"
 "  --recv-only           Set stream direction to recv only (default)   \n"
 "\n"
;



#include <pjlib.h>
#include <pjlib-util.h>
#include <pjmedia.h>
#include <pjmedia-codec.h>

#include <stdlib.h>	/* atoi() */
#include <stdio.h>

#include "util.h"


#define THIS_FILE	"stream.c"



/* Prototype */
static void print_stream_stat(pjmedia_stream *stream);


/* 
 * Register all codecs. 
 */
static pj_status_t init_codecs(pjmedia_endpt *med_endpt)
{
    pj_status_t status;

    /* To suppress warning about unused var when all codecs are disabled */
    PJ_UNUSED_ARG(status);

#if defined(PJMEDIA_HAS_G711_CODEC) && PJMEDIA_HAS_G711_CODEC!=0
    status = pjmedia_codec_g711_init(med_endpt);
    PJ_ASSERT_RETURN(status == PJ_SUCCESS, status);
#endif

#if defined(PJMEDIA_HAS_GSM_CODEC) && PJMEDIA_HAS_GSM_CODEC!=0
    status = pjmedia_codec_gsm_init(med_endpt);
    PJ_ASSERT_RETURN(status == PJ_SUCCESS, status);
#endif

#if defined(PJMEDIA_HAS_SPEEX_CODEC) && PJMEDIA_HAS_SPEEX_CODEC!=0
    status = pjmedia_codec_speex_init(med_endpt, 0, -1, -1);
    PJ_ASSERT_RETURN(status == PJ_SUCCESS, status);
#endif

#if defined(PJMEDIA_HAS_L16_CODEC) && PJMEDIA_HAS_L16_CODEC!=0
    status = pjmedia_codec_l16_init(med_endpt, 0);
    PJ_ASSERT_RETURN(status == PJ_SUCCESS, status);
#endif

    return PJ_SUCCESS;
}


/* 
 * Create stream based on the codec, dir, remote address, etc. 
 */
static pj_status_t create_stream( pj_pool_t *pool,
				  pjmedia_endpt *med_endpt,
				  const pjmedia_codec_info *codec_info,
				  pjmedia_dir dir,
				  pj_uint16_t local_port,
				  const pj_sockaddr_in *rem_addr,
				  pjmedia_stream **p_stream )
{
    pjmedia_stream_info info;
    pjmedia_transport *transport;
    pj_status_t status;


    /* Reset stream info. */
    pj_bzero(&info, sizeof(info));


    /* Initialize stream info formats */
    info.type = PJMEDIA_TYPE_AUDIO;
    info.dir = dir;
    pj_memcpy(&info.fmt, codec_info, sizeof(pjmedia_codec_info));
    info.tx_pt = codec_info->pt;
    info.ssrc = pj_rand();
    

    /* Copy remote address */
    pj_memcpy(&info.rem_addr, rem_addr, sizeof(pj_sockaddr_in));


    /* Create media transport */
    status = pjmedia_transport_udp_create(med_endpt, NULL, local_port,
					  0, &transport);
    if (status != PJ_SUCCESS)
	return status;


    /* Now that the stream info is initialized, we can create the 
     * stream.
     */

    status = pjmedia_stream_create( med_endpt, pool, &info, 
				    transport, NULL, p_stream);

    if (status != PJ_SUCCESS) {
	app_perror(THIS_FILE, "Error creating stream", status);
	pjmedia_transport_udp_close(transport);
	return status;
    }


    return PJ_SUCCESS;
}


/*
 * usage()
 */
static void usage()
{
    puts(desc);
}

/*
 * main()
 */
int main(int argc, char *argv[])
{
    pj_caching_pool cp;
    pjmedia_endpt *med_endpt;
    pj_pool_t *pool;
    pjmedia_port *rec_file_port = NULL, *play_file_port = NULL;
    pjmedia_master_port *master_port = NULL;
    pjmedia_snd_port *snd_port = NULL;
    pjmedia_stream *stream = NULL;
    pjmedia_port *stream_port;
    char tmp[10];
    pj_status_t status; 


    /* Default values */
    const pjmedia_codec_info *codec_info;
    pjmedia_dir dir = PJMEDIA_DIR_DECODING;
    pj_sockaddr_in remote_addr;
    pj_uint16_t local_port = 4000;
    char *codec_id = NULL;
    char *rec_file = NULL;
    char *play_file = NULL;

    enum {
	OPT_CODEC	= 'c',
	OPT_LOCAL_PORT	= 'p',
	OPT_REMOTE	= 'r',
	OPT_PLAY_FILE	= 'w',
	OPT_RECORD_FILE	= 'R',
	OPT_SEND_RECV	= 'b',
	OPT_SEND_ONLY	= 's',
	OPT_RECV_ONLY	= 'i',
	OPT_HELP	= 'h',
    };

    struct pj_getopt_option long_options[] = {
	{ "codec",	    1, 0, OPT_CODEC },
	{ "local-port",	    1, 0, OPT_LOCAL_PORT },
	{ "remote",	    1, 0, OPT_REMOTE },
	{ "play-file",	    1, 0, OPT_PLAY_FILE },
	{ "record-file",    1, 0, OPT_RECORD_FILE },
	{ "send-recv",      0, 0, OPT_SEND_RECV },
	{ "send-only",      0, 0, OPT_SEND_ONLY },
	{ "recv-only",      0, 0, OPT_RECV_ONLY },
	{ "help",	    0, 0, OPT_HELP },
	{ NULL, 0, 0, 0 },
    };

    int c;
    int option_index;


    pj_bzero(&remote_addr, sizeof(remote_addr));


    /* init PJLIB : */
    status = pj_init();
    PJ_ASSERT_RETURN(status == PJ_SUCCESS, 1);


    /* Parse arguments */
    pj_optind = 0;
    while((c=pj_getopt_long(argc,argv, "h", long_options, &option_index))!=-1) {

	switch (c) {
	case OPT_CODEC:
	    codec_id = pj_optarg;
	    break;

	case OPT_LOCAL_PORT:
	    local_port = (pj_uint16_t) atoi(pj_optarg);
	    if (local_port < 1) {
		printf("Error: invalid local port %s\n", pj_optarg);
		return 1;
	    }
	    break;

	case OPT_REMOTE:
	    {
		pj_str_t ip = pj_str(strtok(pj_optarg, ":"));
		pj_uint16_t port = (pj_uint16_t) atoi(strtok(NULL, ":"));

		status = pj_sockaddr_in_init(&remote_addr, &ip, port);
		if (status != PJ_SUCCESS) {
		    app_perror(THIS_FILE, "Invalid remote address", status);
		    return 1;
		}
	    }
	    break;

	case OPT_PLAY_FILE:
	    play_file = pj_optarg;
	    break;

	case OPT_RECORD_FILE:
	    rec_file = pj_optarg;
	    break;

	case OPT_SEND_RECV:
	    dir = PJMEDIA_DIR_ENCODING_DECODING;
	    break;

	case OPT_SEND_ONLY:
	    dir = PJMEDIA_DIR_ENCODING;
	    break;

	case OPT_RECV_ONLY:
	    dir = PJMEDIA_DIR_DECODING;
	    break;

	case OPT_HELP:
	    usage();
	    return 1;

	default:
	    printf("Invalid options %s\n", argv[pj_optind]);
	    return 1;
	}

    }


    /* Verify arguments. */
    if (dir & PJMEDIA_DIR_ENCODING) {
	if (remote_addr.sin_addr.s_addr == 0) {
	    printf("Error: remote address must be set\n");
	    return 1;
	}
    }

    if (play_file != NULL && dir != PJMEDIA_DIR_ENCODING) {
	printf("Direction is set to --send-only because of --play-file\n");
	dir = PJMEDIA_DIR_ENCODING;
    }


    /* Must create a pool factory before we can allocate any memory. */
    pj_caching_pool_init(&cp, &pj_pool_factory_default_policy, 0);

    /* 
     * Initialize media endpoint.
     * This will implicitly initialize PJMEDIA too.
     */
    status = pjmedia_endpt_create(&cp.factory, NULL, 1, &med_endpt);
    PJ_ASSERT_RETURN(status == PJ_SUCCESS, 1);

    /* Create memory pool for application purpose */
    pool = pj_pool_create( &cp.factory,	    /* pool factory	    */
			   "app",	    /* pool name.	    */
			   4000,	    /* init size	    */
			   4000,	    /* increment size	    */
			   NULL		    /* callback on error    */
			   );


    /* Register all supported codecs */
    status = init_codecs(med_endpt);
    PJ_ASSERT_RETURN(status == PJ_SUCCESS, 1);


    /* Find which codec to use. */
    if (codec_id) {
	unsigned count = 1;
	pj_str_t str_codec_id = pj_str(codec_id);
	pjmedia_codec_mgr *codec_mgr = pjmedia_endpt_get_codec_mgr(med_endpt);
	status = pjmedia_codec_mgr_find_codecs_by_id( codec_mgr,
						      &str_codec_id, &count,
						      &codec_info, NULL);
	if (status != PJ_SUCCESS) {
	    printf("Error: unable to find codec %s\n", codec_id);
	    return 1;
	}
    } else {
	/* Default to pcmu */