2 ssize_t (*read)(void *user_data, void *buffer, size_t length);
3 uint32_t (*write)(void *udata, void *buffer, uint32_t length);
4 uint32_t (*seek)(void *user_data, uint64_t position);
5 uint32_t (*truncate)(void *user_data);
20 struct mp4; /* opaque */
22 int mp4_set_sample_position(struct mp4 *f, int32_t sample);
23 struct mp4 *mp4_open_read(const struct mp4_callback *cb);
24 void mp4_close(struct mp4 *f);
25 int32_t mp4_get_sample_size(const struct mp4 *f, int sample);
26 uint32_t mp4_get_sample_rate(const struct mp4 *f);
27 uint32_t mp4_get_channel_count(const struct mp4 * f);
28 int32_t mp4_num_samples(const struct mp4 *f);
29 uint64_t mp4_get_duration(const struct mp4 *f);
30 struct mp4 *mp4_open_meta(const struct mp4_callback *cb);
32 struct mp4_metadata *mp4_get_meta(struct mp4 *f);
33 int32_t mp4_meta_update(struct mp4 *f);
34 char *mp4_meta_get_artist(const struct mp4 *f);
35 char *mp4_meta_get_title(const struct mp4 *f);
36 char *mp4_meta_get_date(const struct mp4 *f);
37 char *mp4_meta_get_album(const struct mp4 *f);
38 char *mp4_meta_get_comment(const struct mp4 *f);