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update for the lastest alsa pcm mmap api. not as bad as at first appearance

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This commit is contained in:
Bill Currie 2001-04-14 02:30:30 +00:00
parent 8fef64c064
commit c0507f5610
1 changed files with 24 additions and 55 deletions
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79
libs/audio/targets/snd_alsa_0_9.c
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@ -43,7 +43,7 @@
static int snd_inited;
static snd_pcm_t *pcm;
static const snd_pcm_channel_area_t *mmap_areas;
//static const snd_pcm_channel_area_t *mmap_areas;
static char *pcmname = NULL;
size_t buffer_size;
@ -187,7 +187,7 @@ SNDDMA_Init (void)
goto error;
}
mmap_areas = snd_pcm_mmap_running_areas (pcm);
//mmap_areas = snd_pcm_mmap_running_areas (pcm);
shm = &sn;
memset ((dma_t *) shm, 0, sizeof (*shm));
@ -204,7 +204,8 @@ SNDDMA_Init (void)
buffer_size = snd_pcm_hw_params_get_buffer_size (hw);
shm->samples = buffer_size * shm->channels; // mono samples in buffer
shm->speed = rate;
shm->buffer = (unsigned char *) mmap_areas->addr;
SNDDMA_GetDMAPos ();//XXX sets shm->buffer
//shm->buffer = (unsigned char *) mmap_areas->addr;
Con_Printf ("%5d stereo\n", shm->channels - 1);
Con_Printf ("%5d samples\n", shm->samples);
Con_Printf ("%5d samplepos\n", shm->samplepos);
@ -221,34 +222,21 @@ SNDDMA_Init (void)
return 0;
}
static inline int
get_hw_ptr ()
{
size_t app_ptr;
snd_pcm_sframes_t delay;
int hw_ptr;
if (snd_pcm_state (pcm) != SND_PCM_STATE_RUNNING)
return 0;
app_ptr = snd_pcm_mmap_offset (pcm);
snd_pcm_delay (pcm, &delay);
hw_ptr = app_ptr - delay;
if (hw_ptr < 0)
hw_ptr += buffer_size;
return hw_ptr;
}
int
SNDDMA_GetDMAPos (void)
{
int hw_ptr;
snd_pcm_uframes_t offset;
snd_pcm_uframes_t nframes = shm->samples/shm->channels;
const snd_pcm_channel_area_t *areas;
if (!snd_inited)
return 0;
hw_ptr = get_hw_ptr ();
hw_ptr *= shm->channels;
shm->samplepos = hw_ptr;
snd_pcm_mmap_begin (pcm, &areas, &offset, &nframes);
offset *= shm->channels;
nframes *= shm->channels;
shm->samplepos = offset;
shm->buffer = areas->addr;//XXX FIXME there's an area per channel
return shm->samplepos;
}
@ -262,51 +250,32 @@ SNDDMA_Shutdown (void)
}
/*
==============
SNDDMA_Submit
SNDDMA_Submit
Send sound to device if buffer isn't really the dma buffer
===============
Send sound to device if buffer isn't really the dma buffer
*/
void
SNDDMA_Submit (void)
{
int count = paintedtime - soundtime;
int avail;
int missed;
snd_pcm_uframes_t offset;
snd_pcm_uframes_t nframes;
const snd_pcm_channel_area_t *areas;
int state;
int hw_ptr;
int offset;
int count = paintedtime - soundtime;
nframes = count / shm->channels;
snd_pcm_mmap_begin (pcm, &areas, &offset, &nframes);
state = snd_pcm_state (pcm);
switch (state) {
case SND_PCM_STATE_PREPARED:
snd_pcm_mmap_forward (pcm, count);
snd_pcm_mmap_commit (pcm, offset, nframes);
snd_pcm_start (pcm);
break;
case SND_PCM_STATE_RUNNING:
hw_ptr = get_hw_ptr ();
missed = hw_ptr - shm->samplepos / shm->channels;
if (missed < 0)
missed += buffer_size;
count -= missed;
offset = snd_pcm_mmap_offset (pcm);
if (offset > hw_ptr)
count -= (offset - hw_ptr);
else
count -= (buffer_size - hw_ptr + offset);
if (count < 0) {
snd_pcm_rewind (pcm, -count);
} else {
avail = snd_pcm_avail_update (pcm);
if (avail < 0)
avail = buffer_size;
if (count > avail)
count = avail;
if (count)
snd_pcm_mmap_forward (pcm, count);
}
snd_pcm_mmap_commit (pcm, offset, nframes);
break;
default:
break;