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Improve winealsa dsound driver by accessing sound driver's buffer 

directly in an undocumented way.
This commit is contained in:
Jerry Jenkins 2005-03-29 19:48:07 +00:00 committed by Alexandre Julliard
parent 67f2ad4563
commit 4a8ce2ae41
1 changed files with 27 additions and 26 deletions
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53
dlls/winmm/winealsa/audio.c
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@ -2441,7 +2441,8 @@ static void DSDB_MMAPCopy(IDsDriverBufferImpl* pdbi)
EnterCriticalSection(&pdbi->mmap_crst);
snd_pcm_mmap_begin(wwo->handle, &areas, &ofs, &frames);
snd_pcm_areas_copy(areas, ofs, pdbi->mmap_areas, ofs, channels, frames, format);
if (areas != pdbi->mmap_areas || areas->addr != pdbi->mmap_areas->addr)
FIXME("Can't access sound driver's buffer directly.\n");
err = snd_pcm_mmap_commit(wwo->handle, ofs, frames);
LeaveCriticalSection(&pdbi->mmap_crst);
@ -2462,15 +2463,15 @@ static void DSDB_PCMCallback(snd_async_handler_t *ahandler)
}
static int DSDB_CreateMMAP(IDsDriverBufferImpl* pdbi)
{
{
WINE_WAVEOUT * wwo = &(WOutDev[pdbi->drv->wDevID]);
snd_pcm_format_t format;
snd_pcm_uframes_t frames;
snd_pcm_uframes_t ofs;
snd_pcm_uframes_t avail;
unsigned int channels;
unsigned int bits_per_sample;
unsigned int bits_per_frame;
snd_pcm_channel_area_t * a;
unsigned int c;
int err;
err = snd_pcm_hw_params_get_format(wwo->hw_params, &format);
@ -2488,45 +2489,45 @@ static int DSDB_CreateMMAP(IDsDriverBufferImpl* pdbi)
pdbi->mmap_buflen_frames = frames;
pdbi->mmap_buflen_bytes = snd_pcm_frames_to_bytes( wwo->handle, frames );
pdbi->mmap_buffer = HeapAlloc(GetProcessHeap(),0,pdbi->mmap_buflen_bytes);
if (!pdbi->mmap_buffer)
return DSERR_OUTOFMEMORY;
avail = snd_pcm_avail_update(wwo->handle);
if (avail < 0)
{
ERR("No buffer is available: %s.", snd_strerror(avail));
return DSERR_GENERIC;
}
err = snd_pcm_mmap_begin(wwo->handle, (const snd_pcm_channel_area_t **)&pdbi->mmap_areas, &ofs, &avail);
if ( err < 0 )
{
ERR("Can't map sound device for direct access: %s\n", snd_strerror(err));
return DSERR_GENERIC;
}
avail = 0;/* We don't have any data to commit yet */
err = snd_pcm_mmap_commit(wwo->handle, ofs, avail);
if (ofs > 0)
err = snd_pcm_rewind(wwo->handle, ofs);
pdbi->mmap_buffer = pdbi->mmap_areas->addr;
snd_pcm_format_set_silence(format, pdbi->mmap_buffer, frames );
TRACE("created mmap buffer of %ld frames (%ld bytes) at %p\n",
frames, pdbi->mmap_buflen_bytes, pdbi->mmap_buffer);
pdbi->mmap_areas = HeapAlloc(GetProcessHeap(),0,channels*sizeof(snd_pcm_channel_area_t));
if (!pdbi->mmap_areas)
return DSERR_OUTOFMEMORY;
a = pdbi->mmap_areas;
for (c = 0; c < channels; c++, a++)
{
a->addr = pdbi->mmap_buffer;
a->first = bits_per_sample * c;
a->step = bits_per_frame;
TRACE("Area %d: addr=%p first=%d step=%d\n", c, a->addr, a->first, a->step);
}
InitializeCriticalSection(&pdbi->mmap_crst);
err = snd_async_add_pcm_handler(&pdbi->mmap_async_handler, wwo->handle, DSDB_PCMCallback, pdbi);
if ( err < 0 )
{
ERR("add_pcm_handler failed. reason: %s\n", snd_strerror(err));
{
ERR("add_pcm_handler failed. reason: %s\n", snd_strerror(err));
return DSERR_GENERIC;
}
}
return DS_OK;
}
}
static void DSDB_DestroyMMAP(IDsDriverBufferImpl* pdbi)
{
TRACE("mmap buffer %p destroyed\n", pdbi->mmap_buffer);
HeapFree(GetProcessHeap(), 0, pdbi->mmap_areas);
HeapFree(GetProcessHeap(), 0, pdbi->mmap_buffer);
pdbi->mmap_areas = NULL;
pdbi->mmap_buffer = NULL;
DeleteCriticalSection(&pdbi->mmap_crst);