typedef struct wave_rec {
	FILE		*fp;
	int		samplerate;
	uint32_t	written;	/* how much samples written */
} wave_rec_t;

typedef struct wave_play {
	FILE		*fp;
	uint32_t	left;		/* how much samples left */
} wave_play_t;

int wave_create_record(wave_rec_t *rec, const char *filename, int samplerate);
int wave_create_playback(wave_play_t *play, const char *filename, int samplerate);
int wave_read(wave_play_t *play, int16_t *samples, int length);
int wave_write(wave_rec_t *rec, int16_t *samples, int length);
void wave_destroy_record(wave_rec_t *rec);
void wave_destroy_playback(wave_play_t *play);