struct mp4; /* opaque */
-void mp4_set_sample_position(struct mp4 *f, int32_t track, int32_t sample);
-int32_t mp4_get_total_tracks(const struct mp4 *f);
-bool mp4_is_audio_track(const struct mp4 *f, int32_t track);
+int mp4_set_sample_position(struct mp4 *f, int32_t sample);
struct mp4 *mp4_open_read(const struct mp4_callback *cb);
void mp4_close(struct mp4 *f);
-int32_t mp4_get_sample_size(const struct mp4 *f, int track, int sample);
-uint32_t mp4_get_sample_rate(const struct mp4 *f, int32_t track);
-uint32_t mp4_get_channel_count(const struct mp4 * f, int32_t track);
-int32_t mp4_num_samples(const struct mp4 *f, int track);
-uint64_t mp4_get_duration(const struct mp4 *f, int32_t track);
+int32_t mp4_get_sample_size(const struct mp4 *f, int sample);
+uint32_t mp4_get_sample_rate(const struct mp4 *f);
+uint32_t mp4_get_channel_count(const struct mp4 * f);
+int32_t mp4_num_samples(const struct mp4 *f);
+uint64_t mp4_get_duration(const struct mp4 *f);
struct mp4 *mp4_open_meta(const struct mp4_callback *cb);
struct mp4_metadata *mp4_get_meta(struct mp4 *f);