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Avoid getting ahead of dsound mixer when using non-hw device. Also 

avoid using internal ALSA call to retrieve hardware play position.
This commit is contained in:
Davin McCall 2005-11-05 10:44:10 +00:00 committed by Alexandre Julliard
parent 079e7cac17
commit 828086ef93
1 changed files with 85 additions and 61 deletions
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146
dlls/winmm/winealsa/audio.c
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@ -3011,6 +3011,10 @@ struct IDsDriverBufferImpl
snd_pcm_uframes_t mmap_buflen_frames;
snd_pcm_channel_area_t * mmap_areas;
snd_async_handler_t * mmap_async_handler;
snd_pcm_uframes_t mmap_ppos; /* play position */
/* Do we have a direct hardware buffer - SND_PCM_TYPE_HW? */
int mmap_mode;
};
static void DSDB_CheckXRUN(IDsDriverBufferImpl* pdbi)
@ -3037,86 +3041,77 @@ static void DSDB_CheckXRUN(IDsDriverBufferImpl* pdbi)
}
}
static void DSDB_MMAPCopy(IDsDriverBufferImpl* pdbi)
static void DSDB_MMAPCopy(IDsDriverBufferImpl* pdbi, int mul)
{
WINE_WAVEDEV * wwo = &(WOutDev[pdbi->drv->wDevID]);
unsigned int channels;
snd_pcm_format_t format;
snd_pcm_uframes_t period_size;
snd_pcm_sframes_t avail;
int err;
int dir=0;
const snd_pcm_channel_area_t *areas;
snd_pcm_uframes_t ofs;
snd_pcm_uframes_t frames;
snd_pcm_uframes_t wanted;
if ( !pdbi->mmap_buffer || !wwo->hw_params || !wwo->pcm)
return;
err = snd_pcm_hw_params_get_channels(wwo->hw_params, &channels);
err = snd_pcm_hw_params_get_format(wwo->hw_params, &format);
dir=0;
err = snd_pcm_hw_params_get_period_size(wwo->hw_params, &period_size, &dir);
avail = snd_pcm_avail_update(wwo->pcm);
DSDB_CheckXRUN(pdbi);
TRACE("avail=%d format=%s channels=%d\n", (int)avail, snd_pcm_format_name(format), channels );
TRACE("avail=%d, mul=%d\n", (int)avail, mul);
while (avail >= period_size)
{
const snd_pcm_channel_area_t *areas;
snd_pcm_uframes_t ofs;
snd_pcm_uframes_t frames;
int err;
frames = pdbi->mmap_buflen_frames;
EnterCriticalSection(&pdbi->mmap_crst);
frames = avail / period_size * period_size; /* round down to a multiple of period_size */
/* we want to commit the given number of periods, or the whole lot */
wanted = mul == 0 ? frames : period_size * 2;
EnterCriticalSection(&pdbi->mmap_crst);
snd_pcm_mmap_begin(wwo->pcm, &areas, &ofs, &frames);
if (areas != pdbi->mmap_areas || areas->addr != pdbi->mmap_areas->addr)
FIXME("Can't access sound driver's buffer directly.\n");
snd_pcm_mmap_begin(wwo->pcm, &areas, &ofs, &frames);
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->pcm, ofs, frames);
LeaveCriticalSection(&pdbi->mmap_crst);
if ( err != (snd_pcm_sframes_t) frames)
ERR("mmap partially failed.\n");
avail = snd_pcm_avail_update(wwo->pcm);
/* mark our current play position */
pdbi->mmap_ppos = ofs;
if (frames > wanted)
frames = wanted;
err = snd_pcm_mmap_commit(wwo->pcm, ofs, frames);
/* Check to make sure we committed all we want to commit. ALSA
* only gives a contiguous linear region, so we need to check this
* in case we've reached the end of the buffer, in which case we
* can wrap around back to the beginning. */
if (frames < wanted) {
frames = wanted -= frames;
snd_pcm_mmap_begin(wwo->pcm, &areas, &ofs, &frames);
snd_pcm_mmap_commit(wwo->pcm, ofs, frames);
}
if (avail > 0)
{
const snd_pcm_channel_area_t *areas;
snd_pcm_uframes_t ofs;
snd_pcm_uframes_t frames;
int err;
frames = avail;
EnterCriticalSection(&pdbi->mmap_crst);
snd_pcm_mmap_begin(wwo->pcm, &areas, &ofs, &frames);
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->pcm, ofs, frames);
LeaveCriticalSection(&pdbi->mmap_crst);
if ( err != (snd_pcm_sframes_t) frames)
ERR("mmap partially failed.\n");
avail = snd_pcm_avail_update(wwo->pcm);
}
LeaveCriticalSection(&pdbi->mmap_crst);
}
static void DSDB_PCMCallback(snd_async_handler_t *ahandler)
{
int periods;
/* snd_pcm_t * handle = snd_async_handler_get_pcm(ahandler); */
IDsDriverBufferImpl* pdbi = snd_async_handler_get_callback_private(ahandler);
TRACE("callback called\n");
DSDB_MMAPCopy(pdbi);
/* Commit another block (the entire buffer if it's a direct hw buffer) */
periods = pdbi->mmap_mode == SND_PCM_TYPE_HW ? 0 : 1;
DSDB_MMAPCopy(pdbi, periods);
}
/**
* Allocate the memory-mapped buffer for direct sound, and set up the
* callback.
*/
static int DSDB_CreateMMAP(IDsDriverBufferImpl* pdbi)
{
WINE_WAVEDEV * wwo = &(WOutDev[pdbi->drv->wDevID]);
@ -3134,7 +3129,14 @@ static int DSDB_CreateMMAP(IDsDriverBufferImpl* pdbi)
err = snd_pcm_hw_params_get_channels(wwo->hw_params, &channels);
bits_per_sample = snd_pcm_format_physical_width(format);
bits_per_frame = bits_per_sample * channels;
pdbi->mmap_mode = snd_pcm_type(wwo->pcm);
if (pdbi->mmap_mode == SND_PCM_TYPE_HW) {
TRACE("mmap'd buffer is a hardware buffer.\n");
}
else {
TRACE("mmap'd buffer is an ALSA emulation of hardware buffer.\n");
}
if (TRACE_ON(wave))
ALSA_TraceParameters(wwo->hw_params, NULL, FALSE);
@ -3286,6 +3288,7 @@ static HRESULT WINAPI IDsDriverBufferImpl_GetPosition(PIDSDRIVERBUFFER iface,
WINE_WAVEDEV * wwo = &(WOutDev[This->drv->wDevID]);
snd_pcm_uframes_t hw_ptr;
snd_pcm_uframes_t period_size;
snd_pcm_state_t state;
int dir;
int err;
@ -3296,17 +3299,19 @@ static HRESULT WINAPI IDsDriverBufferImpl_GetPosition(PIDSDRIVERBUFFER iface,
if (wwo->pcm == NULL) return DSERR_GENERIC;
/** we need to track down buffer underruns */
DSDB_CheckXRUN(This);
DSDB_CheckXRUN(This);
EnterCriticalSection(&This->mmap_crst);
/* FIXME: snd_pcm_mmap_hw_ptr() should not be accessed by a user app. */
/* It will NOT return what why want anyway. */
hw_ptr = _snd_pcm_mmap_hw_ptr(wwo->pcm);
if (hw_ptr >= period_size) hw_ptr -= period_size; else hw_ptr = 0;
hw_ptr = This->mmap_ppos;
state = snd_pcm_state(wwo->pcm);
if (state != SND_PCM_STATE_RUNNING)
hw_ptr = 0;
if (lpdwPlay)
*lpdwPlay = snd_pcm_frames_to_bytes(wwo->pcm, hw_ptr/ period_size * period_size) % This->mmap_buflen_bytes;
*lpdwPlay = snd_pcm_frames_to_bytes(wwo->pcm, hw_ptr) % This->mmap_buflen_bytes;
if (lpdwWrite)
*lpdwWrite = snd_pcm_frames_to_bytes(wwo->pcm, (hw_ptr / period_size + 1) * period_size ) % This->mmap_buflen_bytes;
*lpdwWrite = snd_pcm_frames_to_bytes(wwo->pcm, hw_ptr + period_size * 2) % This->mmap_buflen_bytes;
LeaveCriticalSection(&This->mmap_crst);
TRACE("hw_ptr=0x%08x, playpos=%ld, writepos=%ld\n", (unsigned int)hw_ptr, lpdwPlay?*lpdwPlay:-1, lpdwWrite?*lpdwWrite:-1);
@ -3331,10 +3336,29 @@ static HRESULT WINAPI IDsDriverBufferImpl_Play(PIDSDRIVERBUFFER iface, DWORD dwR
state = snd_pcm_state(wwo->pcm);
}
if ( state == SND_PCM_STATE_PREPARED )
{
DSDB_MMAPCopy(This);
{
/* If we have a direct hardware buffer, we can commit the whole lot
* immediately (periods = 0), otherwise we prime the queue with only
* 2 periods.
*
* Why 2? We want a small number so that we don't get ahead of the
* DirectSound mixer. But we don't want to ever let the buffer get
* completely empty - having 2 periods gives us time to commit another
* period when the first expires.
*
* The potential for buffer underrun is high, but that's the reality
* of using a translated buffer (the whole point of DirectSound is
* to provide direct access to the hardware).
*
* A better implementation would use the buffer Lock() and Unlock()
* methods to determine how far ahead we can commit, and to rewind if
* necessary.
*/
int periods = This->mmap_mode == SND_PCM_TYPE_HW ? 0 : 2;
DSDB_MMAPCopy(This, periods);
err = snd_pcm_start(wwo->pcm);
}
}
return DS_OK;
}