Okay, time to test this stuff

src/sound.c

@@ -1,14 +1,50 @@
+#include <stdlib.h>
+#include <string.h>
 #include <stdint.h>
 #include "sound.h"
 #include "lib/dmt/dmt.h"
+#define STB_VORBIS_HEADER_ONLY 1
+#include "lib/stb/stb_vorbis.c"
 
-int sound_init(sound_t *self, int samples) {
+
+int sound_initSilence(sound_t *self, int samples) {
   self->sampleCount = samples;
   self->samples = (int16_t*)dmt_malloc(samples * sizeof(int16_t));
   return 0;
 }
 
 
+char const* sound_init(sound_t *self, char const* filename) {
+  short *buffer;
+  int channels;
+  int samplingRate;
+  char const* err = NULL;
+
+  int len = stb_vorbis_decode_filename(filename, &channels, &samplingRate, &buffer);
+  if(len == -1) {
+    return "could not decode Vorbis file";
+  }
+
+  if(channels != 1) {
+    err = "only single channel audio files supported";
+    goto fail;
+  }
+
+  if(samplingRate != 22050) {
+    err = "only 22050Hz audio files suported";
+    goto fail;
+  }
+
+  int bufSize = len * sizeof(int16_t);
+  self->samples = (int16_t*)dmt_malloc(bufSize);
+  memcpy(self->samples, buffer, bufSize);
+  
+fail:
+  free(buffer);
+  return err;
+}
+
+
 void sound_deinit(sound_t *self) {
   dmt_free(self->samples);
 }