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#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 "afmt.h"
#include "audio_out.h"
#include "audio_out_internal.h"
extern int verbose;
static ao_info_t info =
{
"OSS/ioctl audio output",
"oss",
"A'rpi",
""
};
/* Support for >2 output channels added 2001-11-25 - Steve Davies <steve@daviesfam.org> */
LIBAO_EXTERN(oss)
static char *dsp="/dev/dsp";
static audio_buf_info zz;
static int audio_fd=-1;
char *oss_mixer_device = "/dev/mixer";
int oss_mixer_usemaster = 0;
// 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;
case AOCONTROL_GET_VOLUME:
case AOCONTROL_SET_VOLUME:
{
ao_control_vol_t *vol = (ao_control_vol_t *)arg;
int fd, v, mcmd, devs;
if(ao_data.format == AFMT_AC3)
return CONTROL_TRUE;
if ((fd = open("/dev/mixer", O_RDONLY)) > 0)
{
ioctl(fd, SOUND_MIXER_READ_DEVMASK, &devs);
if ((devs & SOUND_MASK_PCM) && (oss_mixer_usemaster == 0))
if (cmd == AOCONTROL_GET_VOLUME)
mcmd = SOUND_MIXER_READ_PCM;
else
mcmd = SOUND_MIXER_WRITE_PCM;
else if ((devs & SOUND_MASK_VOLUME) && (oss_mixer_usemaster == 1))
if (cmd == AOCONTROL_GET_VOLUME)
mcmd = SOUND_MIXER_READ_VOLUME;
else
mcmd = SOUND_MIXER_WRITE_VOLUME;
else
{
close(fd);
return CONTROL_ERROR;
}
if (cmd == AOCONTROL_GET_VOLUME)
{
ioctl(fd, cmd, &v);
vol->right = (v & 0xFF00) >> 8;
vol->left = v & 0x00FF;
}
else
{
v = ((int)vol->right << 8) | (int)vol->left;
ioctl(fd, cmd, &v);
}
close(fd);
return CONTROL_OK;
}
}
return CONTROL_ERROR;
}
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 %s\n",rate,channels,
audio_out_format_name(format));
if (ao_subdevice)
dsp = ao_subdevice;
if (verbose)
printf("audio_setup: using '%s' dsp device\n", dsp);
audio_fd=open(dsp, O_WRONLY);
if(audio_fd<0){
printf("Can't open audio device %s -> nosound\n",dsp);
return 0;
}
ao_data.bps=channels*rate;
if(format != AFMT_U8 && format != AFMT_S8)
ao_data.bps*=2;
ao_data.format=format;
ioctl (audio_fd, SNDCTL_DSP_SETFMT, &ao_data.format);
if(format == AFMT_AC3 && ao_data.format != AFMT_AC3) {
printf("Can't set audio device %s to AC3 output\n", dsp);
return 0;
}
printf("audio_setup: sample format: %s (requested: %s)\n",
audio_out_format_name(ao_data.format), audio_out_format_name(format));
if(format != AFMT_AC3) {
// We only use SNDCTL_DSP_CHANNELS for >2 channels, in case some drivers don't have it
ao_data.channels = channels;
if (ao_data.channels > 2) {
if (ioctl (audio_fd, SNDCTL_DSP_CHANNELS, &ao_data.channels) == -1) {
printf("audio_setup: Failed to set audio device to %d channels\n", ao_data.channels);
return 0;
}
}
else {
int c = ao_data.channels-1;
if (ioctl (audio_fd, SNDCTL_DSP_STEREO, &c) == -1) {
printf("audio_setup: Failed to set audio device to %d channels\n", ao_data.channels);
return 0;
}
}
printf("audio_setup: using %d channels (requested: %d)\n", ao_data.channels, ao_data.channels);
// set rate
ao_data.samplerate=rate;
ioctl (audio_fd, SNDCTL_DSP_SPEED, &ao_data.samplerate);
printf("audio_setup: using %d Hz samplerate (requested: %d)\n",ao_data.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_data.outburst);
} else {
ao_data.outburst=r;
printf("audio_setup: %d bytes/frag (GETBLKSIZE)\n",ao_data.outburst);
}
} else {
printf("audio_setup: frags: %3d/%d (%d bytes/frag) free: %6d\n",
zz.fragments, zz.fragstotal, zz.fragsize, zz.bytes);
if(ao_data.buffersize==-1) ao_data.buffersize=zz.bytes;
ao_data.outburst=zz.fragsize;
}
if(ao_data.buffersize==-1){
// Measuring buffer size:
void* data;
ao_data.buffersize=0;
#ifdef HAVE_AUDIO_SELECT
data=malloc(ao_data.outburst); memset(data,0,ao_data.outburst);
while(ao_data.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_data.outburst);
ao_data.buffersize+=ao_data.outburst;
}
free(data);
if(ao_data.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(){
#ifdef SNDCTL_DSP_RESET
ioctl(audio_fd, SNDCTL_DSP_RESET, NULL);
#endif
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_data.format);
if(ao_data.format != AFMT_AC3) {
if (ao_data.channels > 2)
ioctl (audio_fd, SNDCTL_DSP_CHANNELS, &ao_data.channels);
else {
int c = ao_data.channels-1;
ioctl (audio_fd, SNDCTL_DSP_STEREO, &c);
}
ioctl (audio_fd, SNDCTL_DSP_SPEED, &ao_data.samplerate);
}
}
// stop playing, keep buffers (for pause)
static void audio_pause()
{
// for now, just call reset();
reset();
}
// resume playing, after audio_pause()
static void audio_resume()
{
}
// return: how many bytes can be played without blocking
static int get_space(){
int playsize=ao_data.outburst;
#ifdef SNDCTL_DSP_GETOSPACE
if(ioctl(audio_fd, SNDCTL_DSP_GETOSPACE, &zz)!=-1){
// calculate exact buffer space:
return zz.fragments*zz.fragsize;
}
#endif
// 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_data.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_data.outburst;
len=write(audio_fd,data,len*ao_data.outburst);
return len;
}
static int audio_delay_method=2;
// return: delay in seconds between first and last sample in buffer
static float get_delay(){
/* Calculate how many bytes/second is sent out */
if(audio_delay_method==2){
int r=0;
if(ioctl(audio_fd, SNDCTL_DSP_GETODELAY, &r)!=-1)
return ((float)r)/(float)ao_data.bps;
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 ((float)(ao_data.buffersize-zz.bytes))/(float)ao_data.bps;
audio_delay_method=0; // fallback if not supported
}
return ((float)ao_data.buffersize)/(float)ao_data.bps;
}
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