mpv/libao2/ao_sun.c

224 lines
5.0 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/audioio.h>
#ifdef __svr4__
#include <stropts.h>
#endif
#include "../config.h"
#include "audio_out.h"
#include "audio_out_internal.h"
static ao_info_t info =
{
"Sun audio output",
"sun",
"jk@tools.de",
""
};
LIBAO_EXTERN(sun)
#ifndef AUDIO_PRECISION_8
#define AUDIO_PRECISION_8 8
#define AUDIO_PRECISION_16 16
#endif
// there are some globals:
// ao_samplerate
// ao_channels
// ao_format
// ao_bps
// ao_outburst
// ao_buffersize
static char *dsp="/dev/audio";
static int queued_bursts = 0;
static int audio_fd=-1;
// 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){
audio_info_t info;
int byte_per_sec;
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;
}
ioctl(audio_fd, AUDIO_DRAIN, 0);
AUDIO_INITINFO(&info);
info.play.encoding = ao_format = format;
info.play.precision = (format==AUDIO_ENCODING_LINEAR? AUDIO_PRECISION_16:AUDIO_PRECISION_8);
info.play.channels = ao_channels = channels;
--ao_channels;
info.play.sample_rate = ao_samplerate = rate;
info.play.samples = 0;
info.play.eof = 0;
if(ioctl (audio_fd, AUDIO_SETINFO, &info)<0)
printf("audio_setup: your card doesn't support %d Hz samplerate\n",rate);
byte_per_sec = (channels
* (format==AUDIO_ENCODING_LINEAR ? 16 : 8)
* rate);
ao_outburst=byte_per_sec > 100000 ? 16384 : 8192;
queued_bursts = 0;
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;
}
#ifdef __svr4__
ioctl(audio_fd, I_FLUSH, FLUSHW);
#endif
ioctl(audio_fd, AUDIO_DRAIN, 0);
#endif
}
return 1;
}
// close audio device
static void uninit(){
close(audio_fd);
}
// stop playing and empty buffers (for seeking/pause)
static void reset(){
audio_info_t info;
#ifdef __svr4__
ioctl(audio_fd, I_FLUSH, FLUSHW);
#endif
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, AUDIO_DRAIN, 0);
AUDIO_INITINFO(&info);
info.play.encoding = ao_format;
info.play.precision = (ao_format==AUDIO_ENCODING_LINEAR? AUDIO_PRECISION_16:AUDIO_PRECISION_8);
info.play.channels = ao_channels+1;
info.play.sample_rate = ao_samplerate;
info.play.samples = 0;
info.play.eof = 0;
ioctl (audio_fd, AUDIO_SETINFO, &info);
queued_bursts = 0;
}
// stop playing, keep buffers (for pause)
static void audio_pause()
{
struct audio_info info;
AUDIO_INITINFO(&info);
info.play.pause = 1;
ioctl(audio_fd, AUDIO_SETINFO, &info);
}
// resume playing, after audio_pause()
static void audio_resume()
{
struct audio_info info;
AUDIO_INITINFO(&info);
info.play.pause = 0;
ioctl(audio_fd, AUDIO_SETINFO, &info);
}
// return: how many bytes can be played without blocking
static int get_space(){
int playsize=ao_outburst;
// 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
{
audio_info_t info;
ioctl(audio_fd, AUDIO_GETINFO, &info);
if(queued_bursts - info.play.eof > 2)
return 0;
}
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);
if(len>0) {
queued_bursts ++;
write(audio_fd,data,0);
}
return len;
}
static int audio_delay_method=2;
// return: how many unplayed bytes are in the buffer
static int get_delay(){
int q;
audio_info_t info;
ioctl(audio_fd, AUDIO_GETINFO, &info);
return (queued_bursts - info.play.eof) * ao_outburst;
}