layout

audio/drv_alsa.c

@@ -0,0 +1,77 @@
+#include <MDE/Audio/Audio.h>
+
+#ifdef USE_ALSA
+#include <alsa/asoundlib.h>
+
+typedef struct driver_context {
+	snd_pcm_t* device;
+	snd_pcm_hw_params_t* params;
+} driver_context_t;
+
+#include "pthread/decl.c"
+
+static void drv_write(driver_t* drv, void* data, int frames){
+	if(snd_pcm_writei(drv->context.device, data, frames) == -EPIPE){
+		snd_pcm_prepare(drv->context.device);
+	}
+}
+
+static int drv_open(driver_t* drv){
+	snd_pcm_uframes_t frames;
+	int rate = MDEAudioRate;
+	
+	if(snd_pcm_open(&drv->context.device, "default", SND_PCM_STREAM_PLAYBACK, 0) < 0){
+		MDEAudioClose(drv);
+		return 0;
+	}
+
+	snd_pcm_hw_params_malloc(&drv->context.params);
+	snd_pcm_hw_params_any(drv->context.device, drv->context.params);
+	
+	if(snd_pcm_hw_params_set_access(drv->context.device, drv->context.params, SND_PCM_ACCESS_RW_INTERLEAVED) < 0){
+		MDEAudioClose(drv);
+		return 0;
+	}
+	
+	if(snd_pcm_hw_params_set_format(drv->context.device, drv->context.params, SND_PCM_FORMAT_S16) < 0){
+		MDEAudioClose(drv);
+		return 0;
+	}
+
+	if(snd_pcm_hw_params_set_channels(drv->context.device, drv->context.params, 2) < 0){
+		MDEAudioClose(drv);
+		return 0;
+	}
+
+	if(snd_pcm_hw_params_set_rate_near(drv->context.device, drv->context.params, &rate, 0) < 0){
+		MDEAudioClose(drv);
+		return 0;
+	}
+
+	if(snd_pcm_hw_params_set_rate(drv->context.device, drv->context.params, rate, 0) < 0){
+		MDEAudioClose(drv);
+		return 0;
+	}
+
+	if(snd_pcm_hw_params(drv->context.device, drv->context.params) < 0){
+		MDEAudioClose(drv);
+		return 0;
+	}
+
+	snd_pcm_hw_params_get_period_size(drv->context.params, &frames, 0);
+	drv->frames = frames;
+
+	return 1;
+}
+
+
+static void drv_close(driver_t* drv){
+	if(drv->context.device != NULL){
+		snd_pcm_drain(drv->context.device);
+		snd_pcm_close(drv->context.device);
+		snd_pcm_hw_params_free(drv->context.params);
+	}
+}
+
+#include "pthread/body.c"
+#endif