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Added support for auto mmap. Much improved version of pcm_share (without async signals)

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This commit is contained in:
Abramo Bagnara 2000-10-20 09:18:13 +00:00
parent 8d3919707e
commit 9a435c2d93
14 changed files with 621 additions and 328 deletions
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24
src/pcm/pcm_local.h
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@ -112,8 +112,7 @@ struct snd_pcm {
void snd_pcm_areas_from_buf(snd_pcm_t *pcm, snd_pcm_channel_area_t *areas, void *buf);
void snd_pcm_areas_from_bufs(snd_pcm_t *pcm, snd_pcm_channel_area_t *areas, void **bufs);
int snd_pcm_mmap(snd_pcm_t *pcm);
int snd_pcm_munmap(snd_pcm_t *pcm);
int snd_pcm_params_mmap(snd_pcm_t *pcm, snd_pcm_params_t *params);
int snd_pcm_mmap_ready(snd_pcm_t *pcm);
ssize_t snd_pcm_mmap_appl_ptr(snd_pcm_t *pcm, off_t offset);
void snd_pcm_mmap_appl_backward(snd_pcm_t *pcm, size_t frames);
@ -137,6 +136,9 @@ ssize_t snd_pcm_write_areas(snd_pcm_t *pcm, snd_pcm_channel_area_t *areas,
snd_pcm_xfer_areas_func_t func);
ssize_t snd_pcm_read_mmap(snd_pcm_t *pcm, size_t size);
ssize_t snd_pcm_write_mmap(snd_pcm_t *pcm, size_t size);
int snd_pcm_alloc_user_mmap(snd_pcm_t *pcm, snd_pcm_mmap_info_t *i);
int snd_pcm_alloc_kernel_mmap(snd_pcm_t *pcm, snd_pcm_mmap_info_t *i, int fd);
int snd_pcm_free_mmap(snd_pcm_t *pcm, snd_pcm_mmap_info_t *i);
static inline size_t snd_pcm_mmap_playback_avail(snd_pcm_t *pcm)
{
@ -158,10 +160,13 @@ static inline size_t snd_pcm_mmap_capture_avail(snd_pcm_t *pcm)
static inline size_t snd_pcm_mmap_avail(snd_pcm_t *pcm)
{
ssize_t avail;
avail = *pcm->hw_ptr - *pcm->appl_ptr;
if (pcm->stream == SND_PCM_STREAM_PLAYBACK)
return snd_pcm_mmap_playback_avail(pcm);
else
return snd_pcm_mmap_capture_avail(pcm);
avail += pcm->setup.buffer_size;
if (avail < 0)
avail += pcm->setup.boundary;
return avail;
}
static inline ssize_t snd_pcm_mmap_playback_hw_avail(snd_pcm_t *pcm)
@ -184,10 +189,13 @@ static inline ssize_t snd_pcm_mmap_capture_hw_avail(snd_pcm_t *pcm)
static inline ssize_t snd_pcm_mmap_hw_avail(snd_pcm_t *pcm)
{
ssize_t avail;
avail = *pcm->hw_ptr - *pcm->appl_ptr;
if (pcm->stream == SND_PCM_STREAM_PLAYBACK)
return snd_pcm_mmap_playback_hw_avail(pcm);
else
return snd_pcm_mmap_capture_hw_avail(pcm);
avail += pcm->setup.buffer_size;
if (avail < 0)
avail += pcm->setup.boundary;
return pcm->setup.buffer_size - avail;
}
#define snd_pcm_mmap_playback_delay snd_pcm_mmap_playback_hw_avail