mirrors/alsa-lib
1
0
Fork 0
mirror of https://github.com/alsa-project/alsa-lib.git synced 2025-11-03 09:01:52 -05:00
Code Issues Projects Releases Packages Wiki Activity Actions 1

pcm: rate plugin - remove the rewind/forward implementation

Browse source 
Signed-off-by: Jaroslav Kysela <perex@perex.cz>
This commit is contained in:
Jaroslav Kysela 2014-06-13 11:15:07 +02:00
parent 614a66bb2a
commit 5256e150eb
1 changed files with 6 additions and 78 deletions
Download patch file Download diff file Expand all files Collapse all files

84
src/pcm/pcm_rate.c
View file

@ -561,58 +561,6 @@ snd_pcm_rate_read_areas1(snd_pcm_t *pcm,
pcm->channels, rate); pcm->channels, rate);
} }
static inline snd_pcm_sframes_t snd_pcm_rate_move_applptr(snd_pcm_t *pcm, snd_pcm_sframes_t frames)
{
snd_pcm_rate_t *rate = pcm->private_data;
snd_pcm_uframes_t orig_appl_ptr, appl_ptr = rate->appl_ptr, slave_appl_ptr;
snd_pcm_sframes_t diff, ndiff;
snd_pcm_t *slave = rate->gen.slave;
orig_appl_ptr = rate->appl_ptr;
if (frames > 0)
snd_pcm_mmap_appl_forward(pcm, frames);
else
snd_pcm_mmap_appl_backward(pcm, -frames);
slave_appl_ptr =
(appl_ptr / pcm->period_size) * rate->gen.slave->period_size;
diff = slave_appl_ptr - *slave->appl.ptr;
if (diff < -(snd_pcm_sframes_t)(slave->boundary / 2)) {
diff = (slave->boundary - *slave->appl.ptr) + slave_appl_ptr;
} else if (diff > (snd_pcm_sframes_t)(slave->boundary / 2)) {
diff = -((slave->boundary - slave_appl_ptr) + *slave->appl.ptr);
}
if (diff == 0)
return frames;
if (diff > 0) {
ndiff = snd_pcm_forward(rate->gen.slave, diff);
} else {
ndiff = snd_pcm_rewind(rate->gen.slave, diff);
}
if (ndiff < 0)
return diff;
slave_appl_ptr = *slave->appl.ptr;
rate->appl_ptr =
(slave_appl_ptr / rate->gen.slave->period_size) * pcm->period_size +
orig_appl_ptr % pcm->period_size;
if (pcm->stream == SND_PCM_STREAM_PLAYBACK)
rate->appl_ptr += rate->ops.input_frames(rate->obj, slave_appl_ptr % rate->gen.slave->period_size);
else
rate->appl_ptr += rate->ops.output_frames(rate->obj, slave_appl_ptr % rate->gen.slave->period_size);
diff = orig_appl_ptr - rate->appl_ptr;
if (diff < -(snd_pcm_sframes_t)(slave->boundary / 2)) {
diff = (slave->boundary - rate->appl_ptr) + orig_appl_ptr;
} else if (diff > (snd_pcm_sframes_t)(slave->boundary / 2)) {
diff = -((slave->boundary - orig_appl_ptr) + rate->appl_ptr);
}
if (frames < 0)
diff = -diff;
rate->last_commit_ptr = rate->appl_ptr - rate->appl_ptr % pcm->period_size;
return diff;
}
static inline void snd_pcm_rate_sync_hwptr(snd_pcm_t *pcm) static inline void snd_pcm_rate_sync_hwptr(snd_pcm_t *pcm)
{ {
snd_pcm_rate_t *rate = pcm->private_data; snd_pcm_rate_t *rate = pcm->private_data;
@ -699,36 +647,16 @@ static snd_pcm_sframes_t snd_pcm_rate_forwardable(snd_pcm_t *pcm ATTRIBUTE_UNUSE
return 0; return 0;
} }
static snd_pcm_sframes_t snd_pcm_rate_rewind(snd_pcm_t *pcm, snd_pcm_uframes_t frames) static snd_pcm_sframes_t snd_pcm_rate_rewind(snd_pcm_t *pcm ATTRIBUTE_UNUSED,
snd_pcm_uframes_t frames ATTRIBUTE_UNUSED)
{ {
snd_pcm_rate_t *rate = pcm->private_data; return 0;
snd_pcm_sframes_t n = snd_pcm_mmap_hw_avail(pcm);
if ((snd_pcm_uframes_t)n > frames)
frames = n;
if (frames == 0)
return 0;
snd_atomic_write_begin(&rate->watom);
n = snd_pcm_rate_move_applptr(pcm, -frames);
snd_atomic_write_end(&rate->watom);
return n < 0 ? -n : n;
} }
static snd_pcm_sframes_t snd_pcm_rate_forward(snd_pcm_t *pcm, snd_pcm_uframes_t frames) static snd_pcm_sframes_t snd_pcm_rate_forward(snd_pcm_t *pcm ATTRIBUTE_UNUSED,
snd_pcm_uframes_t frames ATTRIBUTE_UNUSED)
{ {
snd_pcm_rate_t *rate = pcm->private_data; return 0;
snd_pcm_sframes_t n = snd_pcm_mmap_avail(pcm);
if ((snd_pcm_uframes_t)n > frames)
frames = n;
if (frames == 0)
return 0;
snd_atomic_write_begin(&rate->watom);
n = snd_pcm_rate_move_applptr(pcm, frames);
snd_atomic_write_end(&rate->watom);
return n;
} }
static int snd_pcm_rate_commit_area(snd_pcm_t *pcm, snd_pcm_rate_t *rate, static int snd_pcm_rate_commit_area(snd_pcm_t *pcm, snd_pcm_rate_t *rate,