mirror of
https://github.com/mpv-player/mpv
synced 2024-12-15 11:25:10 +00:00
4c3818cc9f
git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@753 b3059339-0415-0410-9bf9-f77b7e298cf2
100 lines
2.3 KiB
C
100 lines
2.3 KiB
C
// This small util discovers your audio driver's behaviour
|
|
|
|
//#define OUTBURST 512
|
|
//#define OUTBURST 4096
|
|
#define MAX_OUTBURST 32768
|
|
|
|
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <fcntl.h>
|
|
#include <sys/soundcard.h>
|
|
|
|
#include <sys/time.h>
|
|
#include <sys/types.h>
|
|
#include <unistd.h>
|
|
|
|
|
|
// Returns current time in microseconds
|
|
unsigned int GetTimer(){
|
|
struct timeval tv;
|
|
struct timezone tz;
|
|
// float s;
|
|
gettimeofday(&tv,&tz);
|
|
// s=tv.tv_usec;s*=0.000001;s+=tv.tv_sec;
|
|
return (tv.tv_sec*1000000+tv.tv_usec);
|
|
}
|
|
|
|
static unsigned char a_buffer[MAX_OUTBURST];
|
|
|
|
void inline print_info(int audio_fd){
|
|
#if 1
|
|
audio_buf_info zz;
|
|
ioctl(audio_fd, SNDCTL_DSP_GETOSPACE, &zz);
|
|
printf("Status: %3d/%d (%d byte/frag) free: %6d\n",
|
|
zz.fragments, zz.fragstotal, zz.fragsize, zz.bytes);
|
|
#endif
|
|
}
|
|
|
|
int main(){
|
|
int audio_buffer_size=0;
|
|
int r;
|
|
int xxx=1024*2;
|
|
int audio_fd;
|
|
char *dsp="/dev/dsp";
|
|
unsigned int t0,t1,t2;
|
|
int outburst;
|
|
|
|
audio_fd=open(dsp, O_WRONLY);
|
|
if(audio_fd<0){
|
|
printf("Can't open audio device %s\n",dsp);
|
|
return 1;
|
|
}
|
|
|
|
// ioctl(audio_fd, SNDCTL_DSP_RESET, NULL);
|
|
|
|
// ioctl(audio_fd, SNDCTL_DSP_RESET, NULL);
|
|
|
|
r=AFMT_S16_LE;ioctl (audio_fd, SNDCTL_DSP_SETFMT, &r);
|
|
r=1; ioctl (audio_fd, SNDCTL_DSP_STEREO, &r);
|
|
r=44100; if(ioctl (audio_fd, SNDCTL_DSP_SPEED, &r)==-1)
|
|
printf("audio_setup: your card doesn't support %d Hz samplerate\n",r);
|
|
|
|
r=0; ioctl (audio_fd, SNDCTL_DSP_GETBLKSIZE, &r);
|
|
printf("fragment size = %d\n",r);
|
|
outburst=r; if(outburst>4096) outburst=4096;
|
|
|
|
print_info(audio_fd);
|
|
|
|
t0=t1=GetTimer();
|
|
|
|
while(xxx-->0){
|
|
char c='B';
|
|
fd_set rfds;
|
|
struct timeval tv;
|
|
FD_ZERO(&rfds); FD_SET(audio_fd,&rfds);
|
|
tv.tv_sec=0; tv.tv_usec = 0;
|
|
// if(select(audio_fd+1, NULL, &rfds, NULL, &tv)) c=' ';
|
|
|
|
print_info(audio_fd);
|
|
|
|
r=0; ioctl (audio_fd, SNDCTL_DSP_GETODELAY, &r); printf("delay = %d\n",r);
|
|
|
|
r=write(audio_fd,a_buffer,outburst);
|
|
t2=GetTimer();
|
|
if(r<0) printf("Error writting to device\n"); else
|
|
if(r==0) printf("EOF writting to device???\n"); else {
|
|
printf("%c %6.3f %6.3f [%6d] writting %3d of %3d bytes in %7d us\n",c,
|
|
(float)audio_buffer_size/(44100.0f*4.0f),(float)(t1-t0)*0.000001f,
|
|
audio_buffer_size,r,outburst,t2-t1);
|
|
audio_buffer_size+=r;
|
|
}
|
|
t1=t2;
|
|
}
|
|
|
|
close(audio_fd);
|
|
|
|
return 0;
|
|
}
|
|
|