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Limit the minimum ALSA capture size to 100ms, and the maximum period size to 50ms

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This commit is contained in:
Chris Robinson 2011-09-13 23:51:22 -07:00
parent a4f8408150
commit 62dfea43c6
1 changed files with 7 additions and 1 deletions
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8
Alc/backends/alsa.c
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@ -803,6 +803,7 @@ static ALCenum alsa_open_capture(ALCdevice *pDevice, const ALCchar *deviceName)
{
snd_pcm_hw_params_t *p;
snd_pcm_uframes_t bufferSizeInFrames;
snd_pcm_uframes_t periodSizeInFrames;
snd_pcm_format_t format;
ALuint frameSize;
alsa_data *data;
@ -868,7 +869,9 @@ static ALCenum alsa_open_capture(ALCdevice *pDevice, const ALCchar *deviceName)
}
err = NULL;
bufferSizeInFrames = pDevice->UpdateSize * pDevice->NumUpdates;
bufferSizeInFrames = maxu(pDevice->UpdateSize*pDevice->NumUpdates,
100*pDevice->Frequency/1000);
periodSizeInFrames = minu(bufferSizeInFrames, 50*pDevice->Frequency/1000);
snd_pcm_hw_params_malloc(&p);
if((i=snd_pcm_hw_params_any(data->pcmHandle, p)) < 0)
@ -888,6 +891,9 @@ static ALCenum alsa_open_capture(ALCdevice *pDevice, const ALCchar *deviceName)
/* set buffer size in frame units (implicitly sets period size/bytes/time and buffer time/bytes) */
if(i >= 0 && (i=snd_pcm_hw_params_set_buffer_size_near(data->pcmHandle, p, &bufferSizeInFrames)) < 0)
err = "set buffer size near";
/* set buffer size in frame units (implicitly sets period size/bytes/time and buffer time/bytes) */
if(i >= 0 && (i=snd_pcm_hw_params_set_period_size_near(data->pcmHandle, p, &periodSizeInFrames, NULL)) < 0)
err = "set period size near";
/* install and prepare hardware configuration */
if(i >= 0 && (i=snd_pcm_hw_params(data->pcmHandle, p)) < 0)
err = "set params";