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pcm: introduce pcm_frame_diff and pcm_frame_diff2 helpers

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Signed-off-by: Jaroslav Kysela <perex@perex.cz>
This commit is contained in:
Jaroslav Kysela 2020-10-13 20:10:49 +02:00
parent a6c8ac0c85
commit 6d06fcc285
4 changed files with 30 additions and 40 deletions
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11
src/pcm/pcm_dshare.c
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@ -123,10 +123,7 @@ static void snd_pcm_dshare_sync_area(snd_pcm_t *pcm)
slave_hw_ptr += dshare->slave_buffer_size;
if (slave_hw_ptr >= dshare->slave_boundary)
slave_hw_ptr -= dshare->slave_boundary;
if (slave_hw_ptr < dshare->slave_appl_ptr)
slave_size = slave_hw_ptr + (dshare->slave_boundary - dshare->slave_appl_ptr);
else
slave_size = slave_hw_ptr - dshare->slave_appl_ptr;
slave_size = pcm_frames_diff(slave_hw_ptr, dshare->slave_appl_ptr, dshare->slave_boundary);
if (slave_size < size)
size = slave_size;
if (! size)
@ -169,17 +166,13 @@ static int snd_pcm_dshare_sync_ptr0(snd_pcm_t *pcm, snd_pcm_uframes_t slave_hw_p
old_slave_hw_ptr = dshare->slave_hw_ptr;
dshare->slave_hw_ptr = slave_hw_ptr;
diff = slave_hw_ptr - old_slave_hw_ptr;
diff = pcm_frames_diff(slave_hw_ptr, old_slave_hw_ptr, dshare->slave_boundary);
if (diff == 0) /* fast path */
return 0;
if (dshare->state != SND_PCM_STATE_RUNNING &&
dshare->state != SND_PCM_STATE_DRAINING)
/* not really started yet - don't update hw_ptr */
return 0;
if (diff < 0) {
slave_hw_ptr += dshare->slave_boundary;
diff = slave_hw_ptr - old_slave_hw_ptr;
}
dshare->hw_ptr += diff;
dshare->hw_ptr %= pcm->boundary;
// printf("sync ptr diff = %li\n", diff);