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Make alsa work

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This commit is contained in:
Jay Dolan 2006-01-08 22:04:26 +00:00
parent 86b52d275a
commit 00156f6b40
1 changed files with 31 additions and 48 deletions
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79
src/snd_alsa.c
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@ -25,19 +25,17 @@
#include "client.h"
#include "snd_loc.h"
#define BUFFER_SAMPLES 4096
#define SUBMISSION_CHUNK BUFFER_SAMPLES / 2
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 int periods;
static int period_bytes;
static int buffer_bytes;
static struct sndinfo * si;
static int sample_bytes;
static int buffer_bytes;
/*
* The sample rates which will be attempted.
*/
@ -149,45 +147,29 @@ 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));
snd_pcm_hw_params_free(hw_params);
return false;
}
if((err = snd_pcm_hw_params(pcm_handle, hw_params)) < 0){ //set params
si->Com_Printf("ALSA: cannot set params(%s)\n", snd_strerror(err));
snd_pcm_hw_params_free(hw_params);
return false;
}
if((err = snd_pcm_hw_params_get_period_size(hw_params, &period_size, 0)) < 0){
si->Com_Printf("ALSA: cannot get period size(%s)\n", snd_strerror(err));
snd_pcm_hw_params_free(hw_params);
return false;
}
if((err = snd_pcm_hw_params_get_buffer_size(hw_params, &buffer_size)) < 0){
si->Com_Printf("ALSA snd error, cannot get buffer size(%s)\n", snd_strerror(err));
snd_pcm_hw_params_free(hw_params);
return false;
}
if((err = snd_pcm_hw_params_get_periods(hw_params, &periods, 0)) < 0){
si->Com_Printf("ALSA: cannot get periods(%s)\n", snd_strerror(err));
snd_pcm_hw_params_free(hw_params);
return false;
}
period_bytes = period_size * si->dma->channels * si->dma->samplebits / 8;
buffer_bytes = buffer_size * si->dma->channels * si->dma->samplebits / 8;
sample_bytes = si->dma->samplebits / 8;
buffer_bytes = BUFFER_SAMPLES * sample_bytes;
si->dma->buffer = malloc(buffer_bytes); //allocate pcm frame buffer
memset(si->dma->buffer, 0, buffer_bytes);
si->dma->samplepos = 0;
si->dma->samples = buffer_size * si->dma->channels;
si->dma->submission_chunk = period_size * si->dma->channels;
si->Com_Printf("period size is %d (%d bytes)\n"
"buffer size is %d (%d bytes)\n%d periods\n", (int)period_size,
period_bytes, (int)buffer_size, buffer_bytes, periods
);
si->dma->samples = BUFFER_SAMPLES;
si->dma->submission_chunk = SUBMISSION_CHUNK;
snd_pcm_prepare(pcm_handle);
@ -224,28 +206,29 @@ void SNDDMA_Shutdown(void){
* Writes the dma buffer to the ALSA pcm device.
*/
void SNDDMA_Submit(void){
int w;
int s, w, frames;
void *start;
if(!si->dma->buffer)
return;
start = (void *)&si->dma->buffer[si->dma->samplepos];
s = si->dma->samplepos * sample_bytes;
start = (void *)&si->dma->buffer[s];
if((w = snd_pcm_writei(pcm_handle, start, period_size)) < 0){ //xrun
//si->Com_Printf("ALSA: buffer underrun(%s)\n", snd_strerror(w));
snd_pcm_prepare(pcm_handle);
}
else { //mark progress
//si->Com_Printf("wrote %d frames\n", w);
si->dma->samplepos += w * si->dma->channels;
if(si->dma->samplepos >= si->dma->samples)
si->dma->samplepos = 0; //wrap
frames = si->dma->submission_chunk / si->dma->channels;
if((w = snd_pcm_writei(pcm_handle, start, frames)) < 0){ //write to card
snd_pcm_prepare(pcm_handle); //xrun occured
return;
}
si->dma->samplepos += w * si->dma->channels; //mark progress
if(si->dma->samplepos >= si->dma->samples)
si->dma->samplepos = 0; //wrap buffer
}
/*
* No clue :)
* Callback provided by the engine in case we need it. We don't.
*/
void SNDDMA_BeginPainting(void){}