armornick · August 24, 2012 07:31 · Aug 24, 2012
diff --git a/playwav.c b/playwav.c
@@ -0,0 +1,76 @@
+#include <SDL2/SDL.h>
+
+#define MUS_PATH "Roland-GR-1-Trumpet-C5.wav"
+
+// prototype for our audio callback
+// see the implementation for more information
+void my_audio_callback(void *userdata, Uint8 *stream, int len);
+
+// variable declarations
+static Uint8 *audio_pos; // global pointer to the audio buffer to be played
+static Uint32 audio_len; // remaining length of the sample we have to play
+
+
+/*
+** PLAYING A SOUND IS MUCH MORE COMPLICATED THAN IT SHOULD BE
+*/
+int main(int argc, char* argv[]){
+
+	// Initialize SDL.
+	if (SDL_Init(SDL_INIT_AUDIO) < 0)
+			return 1;
+
+	// local variables
+	static Uint32 wav_length; // length of our sample
+	static Uint8 *wav_buffer; // buffer containing our audio file
+	static SDL_AudioSpec wav_spec; // the specs of our piece of music
+
+
+	/* Load the WAV */
+	// the specs, length and buffer of our wav are filled
+	if( SDL_LoadWAV(MUS_PATH, &wav_spec, &wav_buffer, &wav_length) == NULL ){
+	  return 1;
+	}
+	// set the callback function
+	wav_spec.callback = my_audio_callback;
+	wav_spec.userdata = NULL;
+	// set our global static variables
+	audio_pos = wav_buffer; // copy sound buffer
+	audio_len = wav_length; // copy file length
+
+	/* Open the audio device */
+	if ( SDL_OpenAudio(&wav_spec, NULL) < 0 ){
+	  fprintf(stderr, "Couldn't open audio: %s\n", SDL_GetError());
+	  exit(-1);
+	}
+
+	/* Start playing */
+	SDL_PauseAudio(0);
+
+	// wait until we're don't playing
+	while ( audio_len > 0 ) {
+		SDL_Delay(100); 
+	}
+
+	// shut everything down
+	SDL_CloseAudio();
+	SDL_FreeWAV(wav_buffer);
+
+}
+
+// audio callback function
+// here you have to copy the data of your audio buffer into the
+// requesting audio buffer (stream)
+// you should only copy as much as the requested length (len)
+void my_audio_callback(void *userdata, Uint8 *stream, int len) {
+
+	if (audio_len ==0)
+		return;
+
+	len = ( len > audio_len ? audio_len : len );
+	//SDL_memcpy (stream, audio_pos, len); 					// simply copy from one buffer into the other
+	SDL_MixAudio(stream, audio_pos, len, SDL_MIX_MAXVOLUME);// mix from one buffer into another
+
+	audio_pos += len;
+	audio_len -= len;
+}
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