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/*
* Linux and BSD
*/
#include <sys/ioctl.h>
#ifdef __linux__
#include <linux/soundcard.h>
#else
#include <sys/soundcard.h>
#endif
#include "u.h"
#include "lib.h"
#include "dat.h"
#include "fns.h"
#include "error.h"
#include "devaudio.h"
enum
{
Channels = 2,
Rate = 44100,
Bits = 16,
Bigendian = 1,
};
static int afd = -1;
static int cfd= -1;
static int speed;
/* maybe this should return -1 instead of sysfatal */
void
audiodevopen(void)
{
int t;
ulong ul;
afd = -1;
cfd = -1;
if((afd = open("/dev/dsp", OWRITE)) < 0)
goto err;
if((cfd = open("/dev/mixer", ORDWR)) < 0)
goto err;
t = Bits;
if(ioctl(afd, SNDCTL_DSP_SAMPLESIZE, &t) < 0)
goto err;
t = Channels-1;
if(ioctl(afd, SNDCTL_DSP_STEREO, &t) < 0)
goto err;
speed = Rate;
ul = Rate;
if(ioctl(afd, SNDCTL_DSP_SPEED, &ul) < 0)
goto err;
return;
err:
if(afd >= 0)
close(afd);
afd = -1;
oserror();
}
void
audiodevclose(void)
{
close(afd);
close(cfd);
afd = -1;
cfd = -1;
}
static struct {
int id9;
int id;
} names[] = {
Vaudio, SOUND_MIXER_VOLUME,
Vbass, SOUND_MIXER_BASS,
Vtreb, SOUND_MIXER_TREBLE,
Vline, SOUND_MIXER_LINE,
Vpcm, SOUND_MIXER_PCM,
Vsynth, SOUND_MIXER_SYNTH,
Vcd, SOUND_MIXER_CD,
Vmic, SOUND_MIXER_MIC,
// "record", SOUND_MIXER_RECLEV,
// "mix", SOUND_MIXER_IMIX,
// "pcm2", SOUND_MIXER_ALTPCM,
Vspeaker, SOUND_MIXER_SPEAKER
// "line1", SOUND_MIXER_LINE1,
// "line2", SOUND_MIXER_LINE2,
// "line3", SOUND_MIXER_LINE3,
// "digital1", SOUND_MIXER_DIGITAL1,
// "digital2", SOUND_MIXER_DIGITAL2,
// "digital3", SOUND_MIXER_DIGITAL3,
// "phonein", SOUND_MIXER_PHONEIN,
// "phoneout", SOUND_MIXER_PHONEOUT,
// "radio", SOUND_MIXER_RADIO,
// "video", SOUND_MIXER_VIDEO,
// "monitor", SOUND_MIXER_MONITOR,
// "igain", SOUND_MIXER_IGAIN,
// "ogain", SOUND_MIXER_OGAIN,
};
static int
lookname(int id9)
{
int i;
for(i=0; i<nelem(names); i++)
if(names[i].id9 == id9)
return names[i].id;
return -1;
}
void
audiodevsetvol(int what, int left, int right)
{
int id;
ulong x;
int can, v;
if(cfd < 0)
error("audio device not open");
if(what == Vspeed){
x = left;
if(ioctl(afd, SNDCTL_DSP_SPEED, &x) < 0)
oserror();
speed = x;
return;
}
if((id = lookname(what)) < 0)
return;
if(ioctl(cfd, SOUND_MIXER_READ_DEVMASK, &can) < 0)
can = ~0;
if(!(can & (1<<id)))
return;
v = left | (right<<8);
if(ioctl(cfd, MIXER_WRITE(id), &v) < 0)
oserror();
}
void
audiodevgetvol(int what, int *left, int *right)
{
int id;
int can, v;
if(cfd < 0)
error("audio device not open");
if(what == Vspeed){
*left = *right = speed;
return;
}
if((id = lookname(what)) < 0)
return;
if(ioctl(cfd, SOUND_MIXER_READ_DEVMASK, &can) < 0)
can = ~0;
if(!(can & (1<<id)))
return;
if(ioctl(cfd, MIXER_READ(id), &v) < 0)
oserror();
*left = v&0xFF;
*right = (v>>8)&0xFF;
}
int
audiodevwrite(void *v, int n)
{
int m, tot;
for(tot=0; tot<n; tot+=m)
if((m = write(afd, (uchar*)v+tot, n-tot)) <= 0)
oserror();
return tot;
}
int
audiodevread(void *v, int n)
{
error("no reading");
return -1;
}
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