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Improved automatic start/stop

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This commit is contained in:
Abramo Bagnara 2001-04-19 21:18:23 +00:00
parent 667f008cd4
commit 301a62f90a
8 changed files with 229 additions and 91 deletions
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54
src/pcm/pcm_null.c
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@ -117,7 +117,9 @@ static int snd_pcm_null_start(snd_pcm_t *pcm)
assert(null->state == SND_PCM_STATE_PREPARED);
null->state = SND_PCM_STATE_RUNNING;
if (pcm->stream == SND_PCM_STREAM_CAPTURE)
snd_pcm_mmap_appl_forward(pcm, pcm->buffer_size);
*pcm->hw_ptr = *pcm->appl_ptr + pcm->buffer_size;
else
*pcm->hw_ptr = *pcm->appl_ptr;
return 0;
}
@ -153,10 +155,11 @@ static snd_pcm_sframes_t snd_pcm_null_rewind(snd_pcm_t *pcm, snd_pcm_uframes_t f
{
snd_pcm_null_t *null = pcm->private_data;
switch (snd_enum_to_int(null->state)) {
case SND_PCM_STATE_PREPARED:
case SND_PCM_STATE_RUNNING:
snd_pcm_mmap_appl_backward(pcm, frames);
snd_pcm_mmap_hw_backward(pcm, frames);
/* Fall through */
case SND_PCM_STATE_PREPARED:
snd_pcm_mmap_appl_backward(pcm, frames);
return frames;
default:
return -EBADFD;
@ -167,56 +170,45 @@ static snd_pcm_sframes_t snd_pcm_null_fwd(snd_pcm_t *pcm, snd_pcm_uframes_t size
{
snd_pcm_null_t *null = pcm->private_data;
switch (snd_enum_to_int(null->state)) {
case SND_PCM_STATE_PREPARED:
case SND_PCM_STATE_RUNNING:
snd_pcm_mmap_appl_forward(pcm, size);
snd_pcm_mmap_hw_forward(pcm, size);
/* Fall through */
case SND_PCM_STATE_PREPARED:
snd_pcm_mmap_appl_forward(pcm, size);
return size;
default:
return -EBADFD;
}
}
static snd_pcm_uframes_t snd_pcm_null_xfer_areas(snd_pcm_t *pcm,
const snd_pcm_channel_area_t *areas ATTRIBUTE_UNUSED,
snd_pcm_uframes_t offset ATTRIBUTE_UNUSED,
snd_pcm_uframes_t size)
{
snd_pcm_mmap_appl_forward(pcm, size);
snd_pcm_mmap_hw_forward(pcm, size);
return size;
}
static snd_pcm_sframes_t snd_pcm_null_writei(snd_pcm_t *pcm, const void *buffer ATTRIBUTE_UNUSED, snd_pcm_uframes_t size)
{
snd_pcm_null_t *null = pcm->private_data;
if (null->state == SND_PCM_STATE_PREPARED &&
pcm->start_mode != SND_PCM_START_EXPLICIT) {
null->state = SND_PCM_STATE_RUNNING;
}
return snd_pcm_null_fwd(pcm, size);
return snd_pcm_write_areas(pcm, NULL, 0, size, snd_pcm_null_xfer_areas);
}
static snd_pcm_sframes_t snd_pcm_null_writen(snd_pcm_t *pcm, void **bufs ATTRIBUTE_UNUSED, snd_pcm_uframes_t size)
{
snd_pcm_null_t *null = pcm->private_data;
if (null->state == SND_PCM_STATE_PREPARED &&
pcm->start_mode != SND_PCM_START_EXPLICIT) {
null->state = SND_PCM_STATE_RUNNING;
}
return snd_pcm_null_fwd(pcm, size);
return snd_pcm_write_areas(pcm, NULL, 0, size, snd_pcm_null_xfer_areas);
}
static snd_pcm_sframes_t snd_pcm_null_readi(snd_pcm_t *pcm, void *buffer ATTRIBUTE_UNUSED, snd_pcm_uframes_t size)
{
snd_pcm_null_t *null = pcm->private_data;
if (null->state == SND_PCM_STATE_PREPARED &&
pcm->start_mode != SND_PCM_START_EXPLICIT) {
null->state = SND_PCM_STATE_RUNNING;
snd_pcm_mmap_hw_forward(pcm, pcm->buffer_size);
}
return snd_pcm_null_fwd(pcm, size);
return snd_pcm_read_areas(pcm, NULL, 0, size, snd_pcm_null_xfer_areas);
}
static snd_pcm_sframes_t snd_pcm_null_readn(snd_pcm_t *pcm, void **bufs ATTRIBUTE_UNUSED, snd_pcm_uframes_t size)
{
snd_pcm_null_t *null = pcm->private_data;
if (null->state == SND_PCM_STATE_PREPARED &&
pcm->start_mode != SND_PCM_START_EXPLICIT) {
null->state = SND_PCM_STATE_RUNNING;
snd_pcm_mmap_hw_forward(pcm, pcm->buffer_size);
}
return snd_pcm_null_fwd(pcm, size);
return snd_pcm_read_areas(pcm, NULL, 0, size, snd_pcm_null_xfer_areas);
}
static snd_pcm_sframes_t snd_pcm_null_mmap_commit(snd_pcm_t *pcm,