ref: c116550e6a41572796e4db65e4f6acbcb3d9d6f8
dir: /emu/Linux/audio-oss.c/
#include "dat.h"
#include "fns.h"
#include "error.h"
#include "audio.h"
#include <sys/ioctl.h>
#include <sys/soundcard.h>
#define Audio_Mic_Val SOUND_MIXER_MIC
#define Audio_Linein_Val SOUND_MIXER_LINE
#define Audio_Speaker_Val SOUND_MIXER_PCM // SOUND_MIXER_VOLUME
#define Audio_Headphone_Val SOUND_MIXER_ALTPCM
#define Audio_Lineout_Val SOUND_MIXER_CD
#define Audio_Pcm_Val AFMT_S16_LE
#define Audio_Ulaw_Val AFMT_MU_LAW
#define Audio_Alaw_Val AFMT_A_LAW
#include "audio-tbls.c"
#define min(a,b) ((a) < (b) ? (a) : (b))
#define DEVAUDIO "/dev/dsp"
#define DEVMIXER "/dev/mixer"
#define DPRINT if(1)print
enum {
A_Pause,
A_UnPause,
A_In,
A_Out,
};
static struct {
int data; /* dsp data fd */
int ctl; /* mixer fd */
int pause;
QLock lk;
} afd = {.data = -1, .ctl = -1, .pause =A_UnPause };
static Audio_t av;
static QLock inlock;
static QLock outlock;
static int audio_open(int);
static int audio_pause(int, int);
static int audio_set_info(int, Audio_d*, int);
Audio_t*
getaudiodev(void)
{
return &av;
}
void
audio_file_init(void)
{
audio_info_init(&av);
}
void
audio_file_open(Chan *c, int omode)
{
USED(c);
DPRINT("audio_file_open %d %d %x\n", afd.data, afd.ctl, omode);
qlock(&afd.lk);
if(waserror()){
qunlock(&afd.lk);
nexterror();
}
if(afd.data >= 0)
error(Einuse);
if(afd.ctl < 0){
afd.ctl = open(DEVMIXER, ORDWR);
if(afd.ctl < 0)
oserror();
}
afd.data = audio_open(omode);
if(afd.data < 0)
oserror();
poperror();
qunlock(&afd.lk);
}
void
audio_file_close(Chan *c)
{
USED(c);
DPRINT("audio_file_close %d %d\n", afd.data, afd.ctl);
qlock(&afd.lk);
if(waserror()){
qunlock(&afd.lk);
nexterror();
}
close(afd.data);
afd.data = -1;
qunlock(&afd.lk);
poperror();
}
long
audio_file_read(Chan *c, void *va, long count, vlong offset)
{
long ba, status, chunk, total;
USED(c);
USED(offset);
DPRINT("audio_file_read %d %d\n", afd.data, afd.ctl);
qlock(&inlock);
if(waserror()){
qunlock(&inlock);
nexterror();
}
if(afd.data < 0)
error(Eperm);
/* check block alignment */
ba = av.in.bits * av.in.chan / Bits_Per_Byte;
if(count % ba)
error(Ebadarg);
if(!audio_pause(afd.data, A_UnPause))
error(Eio);
total = 0;
while(total < count){
chunk = count - total;
status = read (afd.data, va + total, chunk);
if(status < 0)
error(Eio);
total += status;
}
if(total != count)
error(Eio);
poperror();
qunlock(&inlock);
return count;
}
long
audio_file_write(Chan *c, void *va, long count, vlong offset)
{
long status = -1;
long ba, total, chunk, bufsz;
USED(c);
USED(offset);
DPRINT("audio_file_write %d %d\n", afd.data, afd.ctl);
qlock(&outlock);
if(waserror()){
qunlock(&outlock);
nexterror();
}
if(afd.data < 0)
error(Eperm);
/* check block alignment */
ba = av.out.bits * av.out.chan / Bits_Per_Byte;
if(count % ba)
error(Ebadarg);
total = 0;
bufsz = av.out.buf * Audio_Max_Buf / Audio_Max_Val;
if(bufsz == 0)
error(Ebadarg);
while(total < count){
chunk = min(bufsz, count - total);
status = write(afd.data, va, chunk);
if(status <= 0)
error(Eio);
total += status;
}
poperror();
qunlock(&outlock);
return count;
}
long
audio_ctl_write(Chan *c, void *va, long count, vlong offset)
{
Audio_t tmpav = av;
int tfd;
USED(c);
USED(offset);
tmpav.in.flags = 0;
tmpav.out.flags = 0;
DPRINT ("audio_ctl_write %X %X\n", afd.data, afd.ctl);
if(!audioparse(va, count, &tmpav))
error(Ebadarg);
if(!canqlock(&inlock))
error("device busy");
if(waserror()){
qunlock(&inlock);
nexterror();
}
if(!canqlock(&outlock))
error("device busy");
if(waserror()){
qunlock(&outlock);
nexterror();
}
/* DEVAUDIO needs to be open to issue an ioctl */
tfd = afd.data;
if(tfd < 0){
tfd = open(DEVAUDIO, O_RDONLY|O_NONBLOCK);
if(tfd < 0)
oserror();
}
if(waserror()){
if(tfd != afd.data)
close(tfd);
nexterror();
}
if(tmpav.in.flags & AUDIO_MOD_FLAG){
if(!audio_pause(tfd, A_Pause))
error(Ebadarg);
if(!audio_set_info(tfd, &tmpav.in, A_In))
error(Ebadarg);
}
poperror();
if(tfd != afd.data)
close(tfd);
tmpav.in.flags = 0;
av = tmpav;
poperror();
qunlock(&outlock);
poperror();
qunlock(&inlock);
return count;
}
/* Linux/OSS specific stuff */
static int
choosefmt(Audio_d *i)
{
switch(i->bits){
case 8:
switch(i->enc){
case Audio_Alaw_Val:
return AFMT_A_LAW;
case Audio_Ulaw_Val:
return AFMT_MU_LAW;
case Audio_Pcm_Val:
return AFMT_U8;
}
break;
case 16:
if(i->enc == Audio_Pcm_Val)
return AFMT_S16_LE;
break;
}
return -1;
}
static int
setvolume(int fd, int what, int left, int right)
{
int can, v;
if(ioctl(fd, SOUND_MIXER_READ_DEVMASK, &can) < 0)
can = ~0;
DPRINT("setvolume fd%d %X can mix 0x%X (mask %X)\n", fd, what, (can & (1<<what)), can);
if(!(can & (1<<what)))
return 0;
v = left | (right<<8);
if(ioctl(afd.ctl, MIXER_WRITE(what), &v) < 0)
return 0;
return 1;
}
static int
audio_set_info(int fd, Audio_d *i, int d)
{
int status, arg;
int oldfmt, newfmt;
USED(d);
DPRINT("audio_set_info (%d) %d %d\n", fd, afd.data, afd.ctl);
if(fd < 0)
return 0;
/* sample rate */
if(i->flags & AUDIO_RATE_FLAG){
arg = i->rate;
if(ioctl(fd, SNDCTL_DSP_SPEED, &arg) < 0)
return 0;
}
/* channels */
if(i->flags & AUDIO_CHAN_FLAG){
arg = i->chan;
if(ioctl(fd, SNDCTL_DSP_CHANNELS, &arg) < 0)
return 0;
}
/* precision */
if(i->flags & AUDIO_BITS_FLAG){
arg = i->bits;
if(ioctl(fd, SNDCTL_DSP_SAMPLESIZE, &arg) < 0)
return 0;
}
/* encoding */
if(i->flags & AUDIO_ENC_FLAG){
ioctl(fd, SNDCTL_DSP_GETFMTS, &oldfmt);
newfmt = choosefmt(i);
if(newfmt < 0)
return 0;
if(newfmt != oldfmt){
status = ioctl(fd, SNDCTL_DSP_SETFMT, &arg);
DPRINT ("enc oldfmt newfmt %x status %d\n", oldfmt, newfmt, status);
}
}
/* dev volume */
if(i->flags & (AUDIO_LEFT_FLAG|AUDIO_VOL_FLAG))
return setvolume(afd.ctl, i->dev, i->left, i->right);
return 1;
}
static int
audio_set_blocking(int fd)
{
int val;
if((val = fcntl(fd, F_GETFL, 0)) == -1)
return 0;
val &= ~O_NONBLOCK;
if(fcntl(fd, F_SETFL, val) < 0)
return 0;
return 1;
}
static int
audio_open(int omode)
{
int fd;
/* open non-blocking in case someone already has it open */
/* otherwise we would block until they close! */
switch (omode){
case OREAD:
fd = open(DEVAUDIO, O_RDONLY|O_NONBLOCK);
break;
case OWRITE:
fd = open(DEVAUDIO, O_WRONLY|O_NONBLOCK);
break;
case ORDWR:
fd = open(DEVAUDIO, O_RDWR|O_NONBLOCK);
break;
}
DPRINT("audio_open %d\n", fd);
if(fd < 0)
oserror();
/* change device to be blocking */
if(!audio_set_blocking(fd)){
close(fd);
error("cannot set blocking mode");
}
if(!audio_pause(fd, A_Pause)){
close(fd);
error(Eio);
}
/* set audio info */
av.in.flags = ~0;
av.out.flags = ~0;
if(!audio_set_info(fd, &av.in, A_In)){
close(fd);
error(Ebadarg);
}
av.in.flags = 0;
/* tada, we're open, blocking, paused and flushed */
return fd;
}
static int
dspsync(int fd)
{
return ioctl(fd, SNDCTL_DSP_RESET, NULL) >= 0 &&
ioctl(fd, SNDCTL_DSP_SYNC, NULL) >= 0;
}
static int
audio_pause(int fd, int f)
{
int status;
// DPRINT ("audio_pause (%d) %d %d\n", fd, afd.data, afd.ctl);
if(fd < 0)
return 0;
if(fd != afd.data)
return dspsync(fd);
qlock(&afd.lk);
if(afd.pause == f){
qunlock(&afd.lk);
return 1;
}
if(waserror()){
qunlock(&afd.lk);
nexterror();
}
status = dspsync(afd.data);
if(status)
afd.pause = f;
poperror();
qunlock(&afd.lk);
return status;
}