void m4af_set_priming(m4af_ctx_t *ctx, uint32_t track_idx,
uint32_t encoder_delay, uint32_t padding);
void m4af_set_priming_mode(m4af_ctx_t *ctx, int mode);
void m4af_set_priming(m4af_ctx_t *ctx, uint32_t track_idx,
uint32_t encoder_delay, uint32_t padding);
void m4af_set_priming_mode(m4af_ctx_t *ctx, int mode);