+void m4af_set_priming_mode(m4af_ctx_t *ctx, int mode);
+
+void m4af_set_num_channels(m4af_ctx_t *ctx, uint32_t track_idx,
+ uint16_t channels);
+
+void m4af_set_fixed_frame_duration(m4af_ctx_t *ctx, uint32_t track_idx,
+ uint32_t length);
+
+int m4af_add_itmf_long_tag(m4af_ctx_t *ctx, const char *name,