struct mp4_callback {
- uint32_t (*read)(void *user_data, void *buffer, uint32_t length);
+ ssize_t (*read)(void *user_data, void *buffer, size_t length);
uint32_t (*write)(void *udata, void *buffer, uint32_t length);
uint32_t (*seek)(void *user_data, uint64_t position);
uint32_t (*truncate)(void *user_data);