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Enable real-time priority for ALSA, OSS, and DirectSound mixing loops

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This commit is contained in:
Chris Robinson 2009-11-29 23:02:21 -08:00
parent 15aad09ce7
commit f63d8dbf38
4 changed files with 35 additions and 6 deletions
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16
Alc/alsa.c
View File

@ -271,6 +271,8 @@ static ALuint ALSAProc(ALvoid *ptr)
char *WritePtr;
int err;
EnableRTPrio();
while(!data->killNow)
{
int state = verify_state(data->pcmHandle);
@ -343,6 +345,8 @@ static ALuint ALSANoMMapProc(ALvoid *ptr)
snd_pcm_sframes_t avail;
char *WritePtr;
EnableRTPrio();
while(!data->killNow)
{
int state = verify_state(data->pcmHandle);
@ -396,6 +400,8 @@ static ALuint ALSANoMMapCaptureProc(ALvoid *ptr)
alsa_data *data = (alsa_data*)pDevice->ExtraData;
snd_pcm_sframes_t avail;
EnableRTPrio();
while(!data->killNow)
{
int state = verify_state(data->pcmHandle);
@ -669,6 +675,9 @@ static ALCboolean alsa_reset_playback(ALCdevice *device)
AL_PRINT("buffer malloc failed\n");
return ALC_FALSE;
}
device->UpdateSize = periodSizeInFrames;
device->NumUpdates = periods;
device->Frequency = rate;
data->thread = StartThread(ALSANoMMapProc, device);
}
else
@ -679,6 +688,9 @@ static ALCboolean alsa_reset_playback(ALCdevice *device)
AL_PRINT("prepare error: %s\n", psnd_strerror(i));
return ALC_FALSE;
}
device->UpdateSize = periodSizeInFrames;
device->NumUpdates = periods;
device->Frequency = rate;
data->thread = StartThread(ALSAProc, device);
}
if(data->thread == NULL)
@ -689,10 +701,6 @@ static ALCboolean alsa_reset_playback(ALCdevice *device)
return ALC_FALSE;
}
device->UpdateSize = periodSizeInFrames;
device->NumUpdates = periods;
device->Frequency = rate;
return ALC_TRUE;
}

5
Alc/dsound.c
View File

@ -134,6 +134,8 @@ static ALuint DSoundProc(ALvoid *ptr)
DWORD avail;
HRESULT err;
EnableRTPrio();
memset(&DSBCaps, 0, sizeof(DSBCaps));
DSBCaps.dwSize = sizeof(DSBCaps);
err = IDirectSoundBuffer_GetCaps(pData->DSsbuffer, &DSBCaps);
@ -413,6 +415,7 @@ static ALCboolean DSoundResetPlayback(ALCdevice *device)
if(SUCCEEDED(hr))
{
device->ExtraData = pData;
device->Format = format;
pData->thread = StartThread(DSoundProc, device);
if(!pData->thread)
hr = E_FAIL;
@ -429,8 +432,6 @@ static ALCboolean DSoundResetPlayback(ALCdevice *device)
return ALC_FALSE;
}
device->Format = format;
return ALC_TRUE;
}

4
Alc/oss.c
View File

@ -82,6 +82,8 @@ static ALuint OSSProc(ALvoid *ptr)
ALint frameSize;
ssize_t wrote;
EnableRTPrio();
frameSize = aluChannelsFromFormat(pDevice->Format) *
aluBytesFromFormat(pDevice->Format);
@ -122,6 +124,8 @@ static ALuint OSSCaptureProc(ALvoid *ptr)
int frameSize;
int amt;
EnableRTPrio();
frameSize = aluBytesFromFormat(pDevice->Format);
frameSize *= aluChannelsFromFormat(pDevice->Format);

16
OpenAL32/Include/alMain.h
View File

@ -181,6 +181,22 @@ static __inline ALuint NextPowerOf2(ALuint value)
return powerOf2;
}
static __inline void EnableRTPrio()
{
#ifdef _WIN32
SetThreadPriority(GetCurrentThread(), THREAD_PRIORITY_TIME_CRITICAL);
#elif defined(HAVE_PTHREAD_SETSCHEDPARAM)
struct sched_param param;
/* Use the minimum real-time priority possible for now (on Linux this
* should be 1 for SCHED_RR) */
param.sched_priority = sched_get_priority_min(SCHED_RR);
pthread_setschedparam(pthread_self(), SCHED_RR, &param);
#else
/* Real-time priority not available */
#endif
}
typedef struct {
ALCboolean (*OpenPlayback)(ALCdevice*, const ALCchar*);