-/* can be called before m4af_write_sample() */
-void m4af_set_fixed_frame_duration(m4af_writer_t *ctx, int track_idx,
- uint32_t length);
-
-/* can be called between mfa4_begin_write() and m4af_finalize() */
-int m4af_write_sample(m4af_writer_t *ctx, int track_idx, const void *data,
- uint32_t size, uint32_t duration);