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Improved plugin code (simpler, faster and multithread ready)

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This commit is contained in:
Abramo Bagnara 2001-02-27 13:42:12 +00:00
parent afde2cfab2
commit 3830b168ef
13 changed files with 407 additions and 564 deletions
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68
src/pcm/pcm_mmap.c
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@ -143,57 +143,69 @@ void snd_pcm_mmap_hw_forward(snd_pcm_t *pcm, snd_pcm_uframes_t frames)
*pcm->hw_ptr = hw_ptr;
}
snd_pcm_sframes_t snd_pcm_mmap_write_areas(snd_pcm_t *pcm,
snd_pcm_uframes_t snd_pcm_mmap_write_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 *slave_sizep)
snd_pcm_uframes_t size)
{
snd_pcm_uframes_t xfer;
if (slave_sizep && *slave_sizep < size)
size = *slave_sizep;
xfer = 0;
while (xfer < size) {
snd_pcm_uframes_t frames = snd_pcm_mmap_playback_xfer(pcm, size - xfer);
snd_pcm_sframes_t err;
snd_pcm_areas_copy(snd_pcm_mmap_areas(pcm), snd_pcm_mmap_offset(pcm),
const snd_pcm_channel_area_t *pcm_areas;
snd_pcm_uframes_t pcm_offset;
snd_pcm_uframes_t xfer = size;
assert(snd_pcm_mmap_playback_avail(pcm) >= size);
pcm_areas = snd_pcm_mmap_areas(pcm);
pcm_offset = snd_pcm_mmap_offset(pcm);
while (size > 0) {
snd_pcm_uframes_t frames = size;
snd_pcm_uframes_t cont = pcm->buffer_size - pcm_offset;
int err;
if (frames > cont)
frames = cont;
snd_pcm_areas_copy(pcm_areas, pcm_offset,
areas, offset,
pcm->channels,
frames, pcm->format);
err = snd_pcm_mmap_forward(pcm, frames);
assert(err == (snd_pcm_sframes_t)frames);
if (frames == cont)
pcm_offset = 0;
else
pcm_offset += frames;
offset += frames;
xfer += frames;
size -= frames;
}
if (slave_sizep)
*slave_sizep = xfer;
return xfer;
}
snd_pcm_sframes_t snd_pcm_mmap_read_areas(snd_pcm_t *pcm,
snd_pcm_uframes_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 *slave_sizep)
snd_pcm_uframes_t size)
{
snd_pcm_uframes_t xfer;
if (slave_sizep && *slave_sizep < size)
size = *slave_sizep;
xfer = 0;
while (xfer < size) {
snd_pcm_uframes_t frames = snd_pcm_mmap_capture_xfer(pcm, size - xfer);
snd_pcm_sframes_t err;
const snd_pcm_channel_area_t *pcm_areas;
snd_pcm_uframes_t pcm_offset;
snd_pcm_uframes_t xfer = size;
assert(snd_pcm_mmap_capture_avail(pcm) >= size);
pcm_areas = snd_pcm_mmap_areas(pcm);
pcm_offset = snd_pcm_mmap_offset(pcm);
while (size > 0) {
snd_pcm_uframes_t frames = size;
snd_pcm_uframes_t cont = pcm->buffer_size - pcm_offset;
int err;
if (frames > cont)
frames = cont;
snd_pcm_areas_copy(areas, offset,
snd_pcm_mmap_areas(pcm), snd_pcm_mmap_offset(pcm),
pcm_areas, pcm_offset,
pcm->channels,
frames, pcm->format);
err = snd_pcm_mmap_forward(pcm, frames);
assert(err == (snd_pcm_sframes_t)frames);
if (frames == cont)
pcm_offset = 0;
else
pcm_offset += frames;
offset += frames;
xfer += frames;
size -= frames;
}
if (slave_sizep)
*slave_sizep = xfer;
return xfer;
}