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Dramatically reduced latency in ALSA sound driver. Also used safer set_*_near in leiu of set_*.

This commit is contained in:
Jay Dolan 2006-01-14 00:52:31 +00:00
parent ea82053181
commit cdc2e36cf7
1 changed files with 20 additions and 6 deletions
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26
src/snd_alsa.c
View File

@ -31,6 +31,9 @@
static snd_pcm_t *pcm_handle;
static snd_pcm_hw_params_t *hw_params;
static snd_pcm_uframes_t period_size;
static snd_pcm_uframes_t buffer_size;
static struct sndinfo * si;
static int sample_bytes;
@ -40,9 +43,9 @@ static int buffer_bytes;
* The sample rates which will be attempted.
*/
static int RATES[] = {
44100, 22050, 11025, 8000
};
44100, 22050, 11025, 8000
};
/*
* Initialize ALSA pcm device, and bind it to sndinfo.
*/
@ -149,9 +152,20 @@ qboolean SNDDMA_Init(struct sndinfo *s){
return false;
}
if((err = snd_pcm_hw_params_set_period_size(pcm_handle, hw_params,
BUFFER_SAMPLES / si->dma->channels, 0)) < 0){
si->Com_Printf("ALSA: cannot set period size(%s)\n", snd_strerror(err));
period_size = BUFFER_SAMPLES / 2 / si->dma->channels;
if((err = snd_pcm_hw_params_set_period_size_near(pcm_handle,
hw_params, &period_size, 0)) < 0){
si->Com_Printf("ALSA: cannot set period size near(%s)\n", snd_strerror(err));
snd_pcm_hw_params_free(hw_params);
return false;
}
buffer_size = period_size * 2;
if((err = snd_pcm_hw_params_set_buffer_size_near(pcm_handle,
hw_params, &buffer_size)) < 0){
si->Com_Printf("ALSA: cannot set buffer size near(%s)\n", snd_strerror(err));
snd_pcm_hw_params_free(hw_params);
return false;
}