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Moved ring buffer pointers and added a mechanism to transfer them via shm

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This commit is contained in:
Jaroslav Kysela 2002-04-23 15:51:29 +00:00
parent f063381430
commit c941c548f8
26 changed files with 469 additions and 171 deletions
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17
src/pcm/pcm_null.c
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@ -112,16 +112,15 @@ static int snd_pcm_null_prepare(snd_pcm_t *pcm)
{
snd_pcm_null_t *null = pcm->private_data;
null->state = SND_PCM_STATE_PREPARED;
null->appl_ptr = 0;
null->hw_ptr = 0;
*pcm->appl.ptr = 0;
*pcm->hw.ptr = 0;
return 0;
}
static int snd_pcm_null_reset(snd_pcm_t *pcm)
{
snd_pcm_null_t *null = pcm->private_data;
null->appl_ptr = 0;
null->hw_ptr = 0;
*pcm->appl.ptr = 0;
*pcm->hw.ptr = 0;
return 0;
}
@ -131,9 +130,9 @@ 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)
*pcm->hw_ptr = *pcm->appl_ptr + pcm->buffer_size;
*pcm->hw.ptr = *pcm->appl.ptr + pcm->buffer_size;
else
*pcm->hw_ptr = *pcm->appl_ptr;
*pcm->hw.ptr = *pcm->appl.ptr;
return 0;
}
@ -387,8 +386,8 @@ int snd_pcm_null_open(snd_pcm_t **pcmp, const char *name, snd_pcm_stream_t strea
pcm->fast_ops = &snd_pcm_null_fast_ops;
pcm->private_data = null;
pcm->poll_fd = fd;
pcm->hw_ptr = &null->hw_ptr;
pcm->appl_ptr = &null->appl_ptr;
snd_pcm_set_hw_ptr(pcm, &null->hw_ptr, -1, 0);
snd_pcm_set_appl_ptr(pcm, &null->appl_ptr, -1, 0);
*pcmp = pcm;
return 0;