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Cleaned the mmap_commit implementations in plugins.

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Added undo callbacks for snd_pcm_plugin based plugins.
  - helpers when mmap_commit proceed only a partial transfer
Fixes to avail_update implementation in pcm_hw.c.
This commit is contained in:
Jaroslav Kysela 2002-02-21 15:01:34 +00:00
parent 9b0eebbcb7
commit e128bf856e
22 changed files with 260 additions and 120 deletions
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30
src/pcm/pcm_mmap.c
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@ -86,24 +86,25 @@ static snd_pcm_sframes_t snd_pcm_mmap_write_areas(snd_pcm_t *pcm,
snd_pcm_uframes_t size)
{
snd_pcm_uframes_t xfer = 0;
int err;
assert(snd_pcm_mmap_playback_avail(pcm) >= size);
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(pcm_areas, pcm_offset,
areas, offset,
pcm->channels,
frames, pcm->format);
err = snd_pcm_mmap_commit(pcm, pcm_offset, frames);
if (err < 0)
return xfer > 0 ? xfer : err;
offset += frames;
xfer += frames;
size -= frames;
result = snd_pcm_mmap_commit(pcm, pcm_offset, frames);
if (result < 0)
return xfer > 0 ? xfer : result;
offset += result;
xfer += result;
size -= result;
}
return xfer;
}
@ -114,24 +115,25 @@ static snd_pcm_sframes_t snd_pcm_mmap_read_areas(snd_pcm_t *pcm,
snd_pcm_uframes_t size)
{
snd_pcm_uframes_t xfer = 0;
int err;
assert(snd_pcm_mmap_capture_avail(pcm) >= size);
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);
err = snd_pcm_mmap_commit(pcm, pcm_offset, frames);
if (err < 0)
return xfer > 0 ? xfer : err;
offset += frames;
xfer += frames;
size -= frames;
result = snd_pcm_mmap_commit(pcm, pcm_offset, frames);
if (result < 0)
return xfer > 0 ? xfer : result;
offset += result;
xfer += result;
size -= result;
}
return xfer;
}