\r
typedef int (*audio_callback_func)(void *buffer, int size, void *cls);\r
\r
-void audio_init(void);\r
+int audio_init(void);\r
\r
void audio_set_callback(audio_callback_func func, void *cls);\r
int audio_callback(void *buf, int sz);\r
void audio_stop(void);\r
int audio_isplaying(void);\r
\r
+/* audio volume: 0-255 */\r
void audio_volume(int vol);\r
\r
#endif /* AUDIO_H_ */\r