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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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6
src/pcm/pcm_dsnoop.c
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@ -152,13 +152,9 @@ static int snd_pcm_dsnoop_sync_ptr(snd_pcm_t *pcm)
old_slave_hw_ptr = dsnoop->slave_hw_ptr;
snoop_timestamp(pcm);
slave_hw_ptr = dsnoop->slave_hw_ptr;
diff = slave_hw_ptr - old_slave_hw_ptr;
diff = pcm_frames_diff(slave_hw_ptr, old_slave_hw_ptr, dsnoop->slave_boundary);
if (diff == 0) /* fast path */
return 0;
if (diff < 0) {
slave_hw_ptr += dsnoop->slave_boundary;
diff = slave_hw_ptr - old_slave_hw_ptr;
}
snd_pcm_dsnoop_sync_area(pcm, old_slave_hw_ptr, diff);
dsnoop->hw_ptr += diff;
dsnoop->hw_ptr %= pcm->boundary;