static void ALSA_MMap_Submit (soundcardinfo_t *sc, int start, int end)
{
int state;
int count = end - start;
const snd_pcm_channel_area_t *areas;
snd_pcm_uframes_t nframes;
snd_pcm_uframes_t offset;
nframes = count / sc->sn.numchannels;
psnd_pcm_avail_update (sc->handle);
psnd_pcm_mmap_begin (sc->handle, &areas, &offset, &nframes);
state = psnd_pcm_state (sc->handle);
switch (state) {
case SND_PCM_STATE_PREPARED:
psnd_pcm_mmap_commit (sc->handle, offset, nframes);
psnd_pcm_start (sc->handle);
break;
case SND_PCM_STATE_RUNNING:
psnd_pcm_mmap_commit (sc->handle, offset, nframes);
break;
default:
break;
}
}
static int verify_state(snd_pcm_t *handle)
{
snd_pcm_state_t state = psnd_pcm_state(handle);
if(state == SND_PCM_STATE_DISCONNECTED)
return -ENODEV;
if(state == SND_PCM_STATE_XRUN)
{
int err = xrun_recovery(handle, -EPIPE);
if(err < 0) return err;
}
else if(state == SND_PCM_STATE_SUSPENDED)
{
int err = xrun_recovery(handle, -ESTRPIPE);
if(err < 0) return err;
}
return state;
}