76 lines
1.8 KiB
C
76 lines
1.8 KiB
C
#include <MDE/Audio/Audio.h>
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#ifdef USE_ALSA
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#include <alsa/asoundlib.h>
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typedef struct driver_context {
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snd_pcm_t* device;
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snd_pcm_hw_params_t* params;
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} driver_context_t;
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#include "thread/decl.c"
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static void drv_write(driver_t* drv, void* data, int frames) {
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if(snd_pcm_writei(drv->context.device, data, frames) == -EPIPE) {
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snd_pcm_prepare(drv->context.device);
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}
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}
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static int drv_open(driver_t* drv) {
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snd_pcm_uframes_t frames;
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int rate = MDEAudioRate;
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if(snd_pcm_open(&drv->context.device, "default", SND_PCM_STREAM_PLAYBACK, 0) < 0) {
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MDEAudioClose(drv);
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return 0;
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}
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snd_pcm_hw_params_malloc(&drv->context.params);
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snd_pcm_hw_params_any(drv->context.device, drv->context.params);
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if(snd_pcm_hw_params_set_access(drv->context.device, drv->context.params, SND_PCM_ACCESS_RW_INTERLEAVED) < 0) {
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MDEAudioClose(drv);
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return 0;
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}
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if(snd_pcm_hw_params_set_format(drv->context.device, drv->context.params, SND_PCM_FORMAT_S16) < 0) {
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MDEAudioClose(drv);
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return 0;
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}
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if(snd_pcm_hw_params_set_channels(drv->context.device, drv->context.params, 2) < 0) {
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MDEAudioClose(drv);
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return 0;
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}
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if(snd_pcm_hw_params_set_rate_near(drv->context.device, drv->context.params, &rate, 0) < 0) {
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MDEAudioClose(drv);
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return 0;
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}
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if(snd_pcm_hw_params_set_rate(drv->context.device, drv->context.params, rate, 0) < 0) {
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MDEAudioClose(drv);
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return 0;
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}
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if(snd_pcm_hw_params(drv->context.device, drv->context.params) < 0) {
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MDEAudioClose(drv);
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return 0;
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}
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snd_pcm_hw_params_get_period_size(drv->context.params, &frames, 0);
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drv->frames = frames;
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return 1;
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}
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static void drv_close(driver_t* drv) {
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if(drv->context.device != NULL) {
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snd_pcm_drain(drv->context.device);
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snd_pcm_close(drv->context.device);
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snd_pcm_hw_params_free(drv->context.params);
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}
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}
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#include "thread/body.c"
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#endif
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