static int decode_picture_timing(H264Context *h) { if (h->sps.nal_hrd_parameters_present_flag || h->sps.vcl_hrd_parameters_present_flag) { h->sei_cpb_removal_delay = get_bits(&h->gb, h->sps.cpb_removal_delay_length); h->sei_dpb_output_delay = get_bits(&h->gb, h->sps.dpb_output_delay_length); } if (h->sps.pic_struct_present_flag) { unsigned int i, num_clock_ts; h->sei_pic_struct = get_bits(&h->gb, 4); h->sei_ct_type = 0; if (h->sei_pic_struct > SEI_PIC_STRUCT_FRAME_TRIPLING) return AVERROR_INVALIDDATA; num_clock_ts = sei_num_clock_ts_table[h->sei_pic_struct]; for (i = 0; i < num_clock_ts; i++) { if (get_bits(&h->gb, 1)) { /* clock_timestamp_flag */ unsigned int full_timestamp_flag; h->sei_ct_type |= 1 << get_bits(&h->gb, 2); skip_bits(&h->gb, 1); /* nuit_field_based_flag */ skip_bits(&h->gb, 5); /* counting_type */ full_timestamp_flag = get_bits(&h->gb, 1); skip_bits(&h->gb, 1); /* discontinuity_flag */ skip_bits(&h->gb, 1); /* cnt_dropped_flag */ skip_bits(&h->gb, 8); /* n_frames */ if (full_timestamp_flag) { skip_bits(&h->gb, 6); /* seconds_value 0..59 */ skip_bits(&h->gb, 6); /* minutes_value 0..59 */ skip_bits(&h->gb, 5); /* hours_value 0..23 */ } else { if (get_bits(&h->gb, 1)) { /* seconds_flag */ skip_bits(&h->gb, 6); /* seconds_value range 0..59 */ if (get_bits(&h->gb, 1)) { /* minutes_flag */ skip_bits(&h->gb, 6); /* minutes_value 0..59 */ if (get_bits(&h->gb, 1)) /* hours_flag */ skip_bits(&h->gb, 5); /* hours_value 0..23 */ } } } if (h->sps.time_offset_length > 0) skip_bits(&h->gb, h->sps.time_offset_length); /* time_offset */ } } if (h->avctx->debug & FF_DEBUG_PICT_INFO) av_log(h->avctx, AV_LOG_DEBUG, "ct_type:%X pic_struct:%d\n", h->sei_ct_type, h->sei_pic_struct); } return 0; }