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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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31
src/pcm/pcm_local.h
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@ -91,6 +91,17 @@ typedef enum sndrv_pcm_hw_param snd_pcm_hw_param_t;
/** device can do a kind of synchronized start */
#define SND_PCM_INFO_SYNC_START SNDRV_PCM_INFO_SYNC_START
typedef struct _snd_pcm_rbptr {
snd_pcm_t *master;
volatile snd_pcm_uframes_t *ptr;
int fd;
off_t offset;
int link_dst_count;
snd_pcm_t **link_dst;
void *private_data;
void (*changed)(snd_pcm_t *pcm, snd_pcm_t *src);
} snd_pcm_rbptr_t;
typedef struct _snd_pcm_channel_info {
unsigned int channel;
void *addr; /* base address of channel samples */
@ -178,9 +189,9 @@ struct _snd_pcm {
snd_pcm_uframes_t buffer_size;
unsigned int sample_bits;
unsigned int frame_bits;
snd_pcm_uframes_t *appl_ptr;
snd_pcm_rbptr_t appl;
snd_pcm_rbptr_t hw;
snd_pcm_uframes_t min_align;
volatile snd_pcm_uframes_t *hw_ptr;
int mmap_rw;
snd_pcm_channel_info_t *mmap_channels;
snd_pcm_channel_area_t *running_areas;
@ -207,6 +218,12 @@ int snd_pcm_async(snd_pcm_t *pcm, int sig, pid_t pid);
int snd_pcm_mmap(snd_pcm_t *pcm);
int snd_pcm_munmap(snd_pcm_t *pcm);
int snd_pcm_mmap_ready(snd_pcm_t *pcm);
void snd_pcm_set_hw_ptr(snd_pcm_t *pcm, volatile snd_pcm_uframes_t *hw_ptr, int fd, off_t offset);
void snd_pcm_set_appl_ptr(snd_pcm_t *pcm, volatile snd_pcm_uframes_t *appl_ptr, int fd, off_t offset);
void snd_pcm_link_hw_ptr(snd_pcm_t *pcm, snd_pcm_t *slave);
void snd_pcm_link_appl_ptr(snd_pcm_t *pcm, snd_pcm_t *slave);
void snd_pcm_unlink_hw_ptr(snd_pcm_t *pcm, snd_pcm_t *slave);
void snd_pcm_unlink_appl_ptr(snd_pcm_t *pcm, snd_pcm_t *slave);
snd_pcm_sframes_t snd_pcm_mmap_appl_ptr(snd_pcm_t *pcm, off_t offset);
void snd_pcm_mmap_appl_backward(snd_pcm_t *pcm, snd_pcm_uframes_t frames);
void snd_pcm_mmap_appl_forward(snd_pcm_t *pcm, snd_pcm_uframes_t frames);
@ -238,7 +255,7 @@ int _snd_pcm_poll_descriptor(snd_pcm_t *pcm);
static inline snd_pcm_uframes_t snd_pcm_mmap_playback_avail(snd_pcm_t *pcm)
{
snd_pcm_sframes_t avail;
avail = *pcm->hw_ptr + pcm->buffer_size - *pcm->appl_ptr;
avail = *pcm->hw.ptr + pcm->buffer_size - *pcm->appl.ptr;
if (avail < 0)
avail += pcm->boundary;
else if ((snd_pcm_uframes_t) avail >= pcm->boundary)
@ -249,7 +266,7 @@ static inline snd_pcm_uframes_t snd_pcm_mmap_playback_avail(snd_pcm_t *pcm)
static inline snd_pcm_uframes_t snd_pcm_mmap_capture_avail(snd_pcm_t *pcm)
{
snd_pcm_sframes_t avail;
avail = *pcm->hw_ptr - *pcm->appl_ptr;
avail = *pcm->hw.ptr - *pcm->appl.ptr;
if (avail < 0)
avail += pcm->boundary;
return avail;
@ -276,7 +293,7 @@ static inline snd_pcm_sframes_t snd_pcm_mmap_capture_hw_avail(snd_pcm_t *pcm)
static inline snd_pcm_sframes_t snd_pcm_mmap_hw_avail(snd_pcm_t *pcm)
{
snd_pcm_sframes_t avail;
avail = *pcm->hw_ptr - *pcm->appl_ptr;
avail = *pcm->hw.ptr - *pcm->appl.ptr;
if (pcm->stream == SND_PCM_STREAM_PLAYBACK)
avail += pcm->buffer_size;
if (avail < 0)
@ -295,13 +312,13 @@ static inline const snd_pcm_channel_area_t *snd_pcm_mmap_areas(snd_pcm_t *pcm)
static inline snd_pcm_uframes_t snd_pcm_mmap_offset(snd_pcm_t *pcm)
{
assert(pcm);
return *pcm->appl_ptr % pcm->buffer_size;
return *pcm->appl.ptr % pcm->buffer_size;
}
static inline snd_pcm_uframes_t snd_pcm_mmap_hw_offset(snd_pcm_t *pcm)
{
assert(pcm);
return *pcm->hw_ptr % pcm->buffer_size;
return *pcm->hw.ptr % pcm->buffer_size;
}
#define snd_pcm_mmap_playback_delay snd_pcm_mmap_playback_hw_avail