void *mixer_thread(void *data) {
int err;
ubyte buffer[SOUND_BUFFER_SIZE];
/* Allow ourselves to be asynchronously cancelled */
pthread_setcanceltype(PTHREAD_CANCEL_ASYNCHRONOUS, NULL);
while (1) {
memset(buffer, 0x80, SOUND_BUFFER_SIZE);
LOCK();
audio_mixcallback(NULL,buffer,SOUND_BUFFER_SIZE);
UNLOCK();
again:
err = snd_pcm_writei(snd_devhandle, buffer, SOUND_BUFFER_SIZE/2);
if (err == -EPIPE) {
// Sound buffer underrun
err = snd_pcm_prepare(snd_devhandle);
if (err < 0) {
con_printf(CON_CRITICAL, "Can't recover from underrun: %s\n",
snd_strerror(err));
}
} else if (err == -EAGAIN) {
goto again;
} else if (err != SOUND_BUFFER_SIZE/2) {
// Each frame has size 2 bytes - hence we expect SOUND_BUFFER_SIZE/2
// frames to be written.
con_printf(CON_CRITICAL, "Unknown err %d: %s\n", err, snd_strerror(err));
}
}
return 0;
}
/* Initialise audio devices. */
int digi_init()
{
/* this is just here now to stop gcc from complaining about
* audio_mixcallback being declared static and not used...
*/
if (0) audio_mixcallback(NULL,NULL,0);
return 1;
}
