rtprecv.c
/*
The oRTP library is an RTP (Realtime Transport Protocol - rfc3550) stack..
Copyright (C) 2001 Simon MORLAT [email protected]
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include
#include
#include
#ifndef _WIN32
#include
#include
#include
#endif
#include
#include
#include
#include
#define LENGTH 1 /* 存储秒数 */
#define RATE 8000 /* 采样频率 */
#define SIZE 8 /* 量化位数 */
#define CHANNELS 1 /* 声道数目 */
// 用于保存数字音频数据的内存 recvs[MAXSIZE]缓冲区 8000bytes
unsigned char sound_buf[LENGTH*RATE*SIZE*CHANNELS/400];
int cond=1;
void stop_handler(int signum)
{
cond=0;
}
void ssrc_cb(RtpSession *session)
{
printf("hey, the ssrc has changed !\n");
}
static char *help="usage: rtprecv loc_port [--format format] [--soundcard] [--noadapt] [--with-jitter
#define MULAW 0
#define ALAW 1
#if 0
#if defined(__hpux) && HAVE_SYS_AUDIO_H
#include
int sound_init(int format)
{
int fd;
fd=open("/dev/audio",O_WRONLY);
if (fd<0){
perror("Can't open /dev/audio");
return -1;
}
ioctl(fd,AUDIO_RESET,0);
ioctl(fd,AUDIO_SET_SAMPLE_RATE,8000);
ioctl(fd,AUDIO_SET_CHANNELS,1);
if (format==MULAW)
ioctl(fd,AUDIO_SET_DATA_FORMAT,AUDIO_FORMAT_ULAW);
else ioctl(fd,AUDIO_SET_DATA_FORMAT,AUDIO_FORMAT_ALAW);
return fd;
}
#else
int sound_init(int format)
{
return -1;
}
#endif
#endif
int main(int argc, char*argv[])
{
RtpSession *session;
unsigned char buffer[160];
int err;
uint32_t ts=0;
int stream_received=0;
FILE *outfile;
int local_port;
int have_more;
int i;
int format=0;
int soundcard=0;
int sound_fd=0;
int jittcomp=40;
bool_t adapt=TRUE;
int ret;
/* init the lib */
if (argc<2){
printf(help);
return -1;
}
local_port=atoi(argv[1]);
if (local_port<=0) {
printf(help);
return -1;
}
for (i=2;i
if (strcmp(argv[i],"--noadapt")==0) adapt=FALSE;
if (strcmp(argv[i],"--format")==0){
i++;
if (i
format=MULAW;
}else
if (strcmp(argv[i],"alaw")==0){
format=ALAW;
}else{
printf("Unsupported format %s\n",argv[i]);
return -1;
}
}
}
else if (strcmp(argv[i],"--soundcard")==0){
soundcard=1;
}
else if (strcmp(argv[i],"--with-jitter")==0){
i++;
if (i
printf("Using a jitter buffer of %i milliseconds.\n",jittcomp);
}
}
}
#if 0
outfile=fopen(argv[1],"wb");
if (outfile==NULL) {
perror("Cannot open file for writing");
return -1;
}
#endif
if (soundcard){
sound_fd= get_sound();
}
ortp_init();
ortp_scheduler_init();
ortp_set_log_level_mask(ORTP_DEBUG|ORTP_MESSAGE|ORTP_WARNING|ORTP_ERROR);
signal(SIGINT,stop_handler);
session=rtp_session_new(RTP_SESSION_RECVONLY);
rtp_session_set_scheduling_mode(session,1);
rtp_session_set_blocking_mode(session,1);
rtp_session_set_local_addr(session,"192.168.0.42",atoi(argv[1]));
rtp_session_set_connected_mode(session,TRUE);
rtp_session_set_symmetric_rtp(session,TRUE);
rtp_session_enable_adaptive_jitter_compensation(session,adapt);
rtp_session_set_jitter_compensation(session,jittcomp);
rtp_session_set_payload_type(session,0);
rtp_session_signal_connect(session,"ssrc_changed",(RtpCallback)ssrc_cb,0);
rtp_session_signal_connect(session,"ssrc_changed",(RtpCallback)rtp_session_reset,0);
while(cond)
{
have_more=1;
while (have_more){
err=rtp_session_recv_with_ts(session,buffer,160,ts,&have_more);
if (err>0) //stream_received=1;
/* this is to avoid to write to disk some silence before the first RTP packet is returned*/
#if 0
if ((stream_received) && (err>0)) {
size_t ret = fwrite(buffer,1,err,outfile);
#endif
//if (sound_fd>0)
ret = write(sound_fd,buffer,err);
/*if (ret != err)
perror("wrote wrong number of bytes"); */
//}
}
ts+=160;
//ortp_message("Receiving packet.");
}
rtp_session_destroy(session);
ortp_exit();
ortp_global_stats_display();
return 0;
}
int get_sound(void)
{
int fd; /* 声音设备的文件描述符 */
int arg; /* 用于ioctl调用的参数 */
int status; /* 系统调用的返回值 */
/* 打开声音设备 */
fd = open("/dev/dsp", O_RDWR);
if (fd < 0) {
perror("open of /dev/dsp failed");
exit(1);
}
/* 设置采样时的量化位数 */
arg = SIZE;
status = ioctl(fd, SOUND_PCM_WRITE_BITS, &arg);
if (status == -1)
perror("SOUND_PCM_WRITE_BITS ioctl failed");
if (arg != SIZE)
perror("unable to set sample size");
/* 设置采样时的声道数目 */
arg = CHANNELS;
status = ioctl(fd, SOUND_PCM_WRITE_CHANNELS, &arg);
if (status == -1)
perror("SOUND_PCM_WRITE_CHANNELS ioctl failed");
if (arg != CHANNELS)
perror("unable to set number of channels");
/* 设置采样时的采样频率 */
arg = RATE;
status = ioctl(fd, SOUND_PCM_WRITE_RATE, &arg);
if (status == -1)
perror("SOUND_PCM_WRITE_WRITE ioctl failed");
return(fd);
}