static snd_pcm_sframes_t snd_pcm_mmap_read_areas(snd_pcm_t *pcm,
const snd_pcm_channel_area_t *areas,
snd_pcm_uframes_t offset,
snd_pcm_uframes_t size)
{
snd_pcm_uframes_t xfer = 0;
if (snd_pcm_mmap_capture_avail(pcm) < size) {
SNDMSG("too short avail %ld to size %ld", snd_pcm_mmap_capture_avail(pcm), size);
return -EPIPE;
}
while (size > 0) {
const snd_pcm_channel_area_t *pcm_areas;
snd_pcm_uframes_t pcm_offset;
snd_pcm_uframes_t frames = size;
snd_pcm_sframes_t result;
snd_pcm_mmap_begin(pcm, &pcm_areas, &pcm_offset, &frames);
snd_pcm_areas_copy(areas, offset,
pcm_areas, pcm_offset,
pcm->channels,
frames, pcm->format);
result = snd_pcm_mmap_commit(pcm, pcm_offset, frames);
if (result < 0)
return xfer > 0 ? (snd_pcm_sframes_t)xfer : result;
offset += result;
xfer += result;
size -= result;
}
return (snd_pcm_sframes_t)xfer;
}
static snd_pcm_uframes_t snd_pcm_mmap_avail(snd_pcm_t *pcm)
{
if (pcm->stream == SND_PCM_STREAM_PLAYBACK)
return snd_pcm_mmap_playback_avail(pcm);
else
return snd_pcm_mmap_capture_avail(pcm);
}
static int snd_pcm_dsnoop_status(snd_pcm_t *pcm, snd_pcm_status_t * status)
{
snd_pcm_direct_t *dsnoop = pcm->private_data;
snd_pcm_state_t state;
switch(dsnoop->state) {
case SNDRV_PCM_STATE_DRAINING:
case SNDRV_PCM_STATE_RUNNING:
snd_pcm_dsnoop_sync_ptr(pcm);
break;
default:
break;
}
memset(status, 0, sizeof(*status));
state = snd_pcm_state(dsnoop->spcm);
status->state = state == SND_PCM_STATE_RUNNING ? dsnoop->state : state;
status->trigger_tstamp = dsnoop->trigger_tstamp;
status->tstamp = dsnoop->update_tstamp;
status->avail = snd_pcm_mmap_capture_avail(pcm);
status->avail_max = status->avail > dsnoop->avail_max ? status->avail : dsnoop->avail_max;
dsnoop->avail_max = 0;
return 0;
}
