mpv/libao2/ao_oss.c

192 lines
4.7 KiB
C

#include <stdio.h>
#include <stdlib.h>
#include <sys/ioctl.h>
#include <unistd.h>
#include <sys/time.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <sys/soundcard.h>
#include "../config.h"
#include "audio_out.h"
#include "audio_out_internal.h"
static ao_info_t info =
{
"OSS/ioctl audio output",
"oss",
"A'rpi",
""
};
LIBAO_EXTERN(oss)
// there are some globals:
// ao_samplerate
// ao_channels
// ao_format
// ao_bps
// ao_outburst
// ao_buffersize
static char* dsp="/dev/dsp";
static int audio_fd=-1;
static audio_buf_info zz;
// to set/get/query special features/parameters
static int control(int cmd,int arg){
switch(cmd){
case AOCONTROL_SET_DEVICE:
dsp=(char*)arg;
return CONTROL_OK;
case AOCONTROL_QUERY_FORMAT:
return CONTROL_TRUE;
}
return CONTROL_UNKNOWN;
}
// open & setup audio device
// return: 1=success 0=fail
static int init(int rate,int channels,int format,int flags){
printf("ao2: %d Hz %d chans 0x%X\n",rate,channels,format);
audio_fd=open(dsp, O_WRONLY);
if(audio_fd<0){
printf("Can't open audio device %s -> nosound\n",dsp);
return 0;
}
ao_format=format;
ioctl (audio_fd, SNDCTL_DSP_SETFMT, &ao_format);
printf("audio_setup: sample format: 0x%X (requested: 0x%X)\n",ao_format,format);
ao_channels=channels-1;
ioctl (audio_fd, SNDCTL_DSP_STEREO, &ao_channels);
// set rate
ao_samplerate=rate;
ioctl (audio_fd, SNDCTL_DSP_SPEED, &ao_samplerate);
printf("audio_setup: using %d Hz samplerate (requested: %d)\n",ao_samplerate,rate);
if(ioctl(audio_fd, SNDCTL_DSP_GETOSPACE, &zz)==-1){
int r=0;
printf("audio_setup: driver doesn't support SNDCTL_DSP_GETOSPACE :-(\n");
if(ioctl(audio_fd, SNDCTL_DSP_GETBLKSIZE, &r)==-1){
printf("audio_setup: %d bytes/frag (config.h)\n",ao_outburst);
} else {
ao_outburst=r;
printf("audio_setup: %d bytes/frag (GETBLKSIZE)\n",ao_outburst);
}
} else {
printf("audio_setup: frags: %3d/%d (%d bytes/frag) free: %6d\n",
zz.fragments, zz.fragstotal, zz.fragsize, zz.bytes);
if(ao_buffersize==-1) ao_buffersize=zz.bytes;
ao_outburst=zz.fragsize;
}
if(ao_buffersize==-1){
// Measuring buffer size:
void* data;
ao_buffersize=0;
#ifdef HAVE_AUDIO_SELECT
data=malloc(ao_outburst); memset(data,0,ao_outburst);
while(ao_buffersize<0x40000){
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)) break;
write(audio_fd,data,ao_outburst);
ao_buffersize+=ao_outburst;
}
free(data);
if(ao_buffersize==0){
printf("\n *** Your audio driver DOES NOT support select() ***\n");
printf("Recompile mplayer with #undef HAVE_AUDIO_SELECT in config.h !\n\n");
return 0;
}
#endif
}
return 1;
}
// close audio device
static void uninit(){
ioctl(audio_fd, SNDCTL_DSP_RESET, NULL);
close(audio_fd);
}
// stop playing and empty buffers (for seeking/pause)
static void reset(){
uninit();
audio_fd=open(dsp, O_WRONLY);
if(audio_fd<0){
printf("\nFatal error: *** CANNOT RE-OPEN / RESET AUDIO DEVICE ***\n");
return;
}
ioctl (audio_fd, SNDCTL_DSP_SETFMT, &ao_format);
ioctl (audio_fd, SNDCTL_DSP_STEREO, &ao_channels);
ioctl (audio_fd, SNDCTL_DSP_SPEED, &ao_samplerate);
}
// return: how many bytes can be played without blocking
static int get_space(){
int playsize=ao_outburst;
if(ioctl(audio_fd, SNDCTL_DSP_GETOSPACE, &zz)!=-1){
// calculate exact buffer space:
return zz.fragments*zz.fragsize;
}
// check buffer
#ifdef HAVE_AUDIO_SELECT
{ 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)) return 0; // not block!
}
#endif
return ao_outburst;
}
// plays 'len' bytes of 'data'
// it should round it down to outburst*n
// return: number of bytes played
static int play(void* data,int len,int flags){
len/=ao_outburst;
len=write(audio_fd,data,len*ao_outburst);
return len;
}
static int audio_delay_method=2;
// return: how many unplayed bytes are in the buffer
static int get_delay(){
if(audio_delay_method==2){
//
int r=0;
if(ioctl(audio_fd, SNDCTL_DSP_GETODELAY, &r)!=-1)
return r;
audio_delay_method=1; // fallback if not supported
}
if(audio_delay_method==1){
// SNDCTL_DSP_GETOSPACE
if(ioctl(audio_fd, SNDCTL_DSP_GETOSPACE, &zz)!=-1)
return ao_buffersize-zz.bytes;
audio_delay_method=0; // fallback if not supported
}
return ao_buffersize;
}