yading@10: /* yading@10: * H.26L/H.264/AVC/JVT/14496-10/... sei decoding yading@10: * Copyright (c) 2003 Michael Niedermayer yading@10: * yading@10: * This file is part of FFmpeg. yading@10: * yading@10: * FFmpeg is free software; you can redistribute it and/or yading@10: * modify it under the terms of the GNU Lesser General Public yading@10: * License as published by the Free Software Foundation; either yading@10: * version 2.1 of the License, or (at your option) any later version. yading@10: * yading@10: * FFmpeg is distributed in the hope that it will be useful, yading@10: * but WITHOUT ANY WARRANTY; without even the implied warranty of yading@10: * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU yading@10: * Lesser General Public License for more details. yading@10: * yading@10: * You should have received a copy of the GNU Lesser General Public yading@10: * License along with FFmpeg; if not, write to the Free Software yading@10: * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA yading@10: */ yading@10: yading@10: /** yading@10: * @file yading@10: * H.264 / AVC / MPEG4 part10 sei decoding. yading@10: * @author Michael Niedermayer yading@10: */ yading@10: yading@10: #include "internal.h" yading@10: #include "avcodec.h" yading@10: #include "h264.h" yading@10: #include "golomb.h" yading@10: yading@10: //#undef NDEBUG yading@10: #include yading@10: yading@10: static const uint8_t sei_num_clock_ts_table[9]={ yading@10: 1, 1, 1, 2, 2, 3, 3, 2, 3 yading@10: }; yading@10: yading@10: void ff_h264_reset_sei(H264Context *h) { yading@10: h->sei_recovery_frame_cnt = -1; yading@10: h->sei_dpb_output_delay = 0; yading@10: h->sei_cpb_removal_delay = -1; yading@10: h->sei_buffering_period_present = 0; yading@10: } yading@10: yading@10: static int decode_picture_timing(H264Context *h){ yading@10: if(h->sps.nal_hrd_parameters_present_flag || h->sps.vcl_hrd_parameters_present_flag){ yading@10: h->sei_cpb_removal_delay = get_bits_long(&h->gb, h->sps.cpb_removal_delay_length); yading@10: h->sei_dpb_output_delay = get_bits_long(&h->gb, h->sps.dpb_output_delay_length); yading@10: } yading@10: if(h->sps.pic_struct_present_flag){ yading@10: unsigned int i, num_clock_ts; yading@10: h->sei_pic_struct = get_bits(&h->gb, 4); yading@10: h->sei_ct_type = 0; yading@10: yading@10: if (h->sei_pic_struct > SEI_PIC_STRUCT_FRAME_TRIPLING) yading@10: return -1; yading@10: yading@10: num_clock_ts = sei_num_clock_ts_table[h->sei_pic_struct]; yading@10: yading@10: for (i = 0 ; i < num_clock_ts ; i++){ yading@10: if(get_bits(&h->gb, 1)){ /* clock_timestamp_flag */ yading@10: unsigned int full_timestamp_flag; yading@10: h->sei_ct_type |= 1<gb, 2); yading@10: skip_bits(&h->gb, 1); /* nuit_field_based_flag */ yading@10: skip_bits(&h->gb, 5); /* counting_type */ yading@10: full_timestamp_flag = get_bits(&h->gb, 1); yading@10: skip_bits(&h->gb, 1); /* discontinuity_flag */ yading@10: skip_bits(&h->gb, 1); /* cnt_dropped_flag */ yading@10: skip_bits(&h->gb, 8); /* n_frames */ yading@10: if(full_timestamp_flag){ yading@10: skip_bits(&h->gb, 6); /* seconds_value 0..59 */ yading@10: skip_bits(&h->gb, 6); /* minutes_value 0..59 */ yading@10: skip_bits(&h->gb, 5); /* hours_value 0..23 */ yading@10: }else{ yading@10: if(get_bits(&h->gb, 1)){ /* seconds_flag */ yading@10: skip_bits(&h->gb, 6); /* seconds_value range 0..59 */ yading@10: if(get_bits(&h->gb, 1)){ /* minutes_flag */ yading@10: skip_bits(&h->gb, 6); /* minutes_value 0..59 */ yading@10: if(get_bits(&h->gb, 1)) /* hours_flag */ yading@10: skip_bits(&h->gb, 5); /* hours_value 0..23 */ yading@10: } yading@10: } yading@10: } yading@10: if(h->sps.time_offset_length > 0) yading@10: skip_bits(&h->gb, h->sps.time_offset_length); /* time_offset */ yading@10: } yading@10: } yading@10: yading@10: if(h->avctx->debug & FF_DEBUG_PICT_INFO) yading@10: av_log(h->avctx, AV_LOG_DEBUG, "ct_type:%X pic_struct:%d\n", h->sei_ct_type, h->sei_pic_struct); yading@10: } yading@10: return 0; yading@10: } yading@10: yading@10: static int decode_user_data_itu_t_t35(H264Context *h, int size) { yading@10: uint32_t user_identifier; yading@10: int dtg_active_format; yading@10: yading@10: if (size < 7) yading@10: return -1; yading@10: size -= 7; yading@10: yading@10: skip_bits(&h->gb, 8); // country_code yading@10: skip_bits(&h->gb, 16); // provider_code yading@10: user_identifier = get_bits_long(&h->gb, 32); yading@10: yading@10: switch (user_identifier) { yading@10: case 0x44544731: // "DTG1" - AFD_data yading@10: if (size < 1) yading@10: return -1; yading@10: skip_bits(&h->gb, 1); yading@10: if (get_bits(&h->gb, 1)) { yading@10: skip_bits(&h->gb, 6); yading@10: if (size < 2) yading@10: return -1; yading@10: skip_bits(&h->gb, 4); yading@10: dtg_active_format = get_bits(&h->gb, 4); yading@10: h->avctx->dtg_active_format = dtg_active_format; yading@10: } else { yading@10: skip_bits(&h->gb, 6); yading@10: } yading@10: break; yading@10: default: yading@10: skip_bits(&h->gb, size * 8); yading@10: break; yading@10: } yading@10: yading@10: return 0; yading@10: } yading@10: yading@10: static int decode_unregistered_user_data(H264Context *h, int size){ yading@10: uint8_t user_data[16+256]; yading@10: int e, build, i; yading@10: yading@10: if(size<16) yading@10: return -1; yading@10: yading@10: for(i=0; igb, 8); yading@10: } yading@10: yading@10: user_data[i]= 0; yading@10: e= sscanf(user_data+16, "x264 - core %d"/*%s - H.264/MPEG-4 AVC codec - Copyleft 2005 - http://www.videolan.org/x264.html*/, &build); yading@10: if(e==1 && build>0) yading@10: h->x264_build= build; yading@10: if(e==1 && build==1 && !strncmp(user_data+16, "x264 - core 0000", 16)) yading@10: h->x264_build = 67; yading@10: yading@10: if(h->avctx->debug & FF_DEBUG_BUGS) yading@10: av_log(h->avctx, AV_LOG_DEBUG, "user data:\"%s\"\n", user_data+16); yading@10: yading@10: for(; igb, 8); yading@10: yading@10: return 0; yading@10: } yading@10: yading@10: static int decode_recovery_point(H264Context *h){ yading@10: h->sei_recovery_frame_cnt = get_ue_golomb(&h->gb); yading@10: skip_bits(&h->gb, 4); /* 1b exact_match_flag, 1b broken_link_flag, 2b changing_slice_group_idc */ yading@10: yading@10: if(h->avctx->debug & FF_DEBUG_PICT_INFO) yading@10: av_log(h->avctx, AV_LOG_DEBUG, "sei_recovery_frame_cnt: %d\n", h->sei_recovery_frame_cnt); yading@10: yading@10: return 0; yading@10: } yading@10: yading@10: static int decode_buffering_period(H264Context *h){ yading@10: unsigned int sps_id; yading@10: int sched_sel_idx; yading@10: SPS *sps; yading@10: yading@10: sps_id = get_ue_golomb_31(&h->gb); yading@10: if(sps_id > 31 || !h->sps_buffers[sps_id]) { yading@10: av_log(h->avctx, AV_LOG_ERROR, "non-existing SPS %d referenced in buffering period\n", sps_id); yading@10: return -1; yading@10: } yading@10: sps = h->sps_buffers[sps_id]; yading@10: yading@10: // NOTE: This is really so duplicated in the standard... See H.264, D.1.1 yading@10: if (sps->nal_hrd_parameters_present_flag) { yading@10: for (sched_sel_idx = 0; sched_sel_idx < sps->cpb_cnt; sched_sel_idx++) { yading@10: h->initial_cpb_removal_delay[sched_sel_idx] = get_bits_long(&h->gb, sps->initial_cpb_removal_delay_length); yading@10: skip_bits(&h->gb, sps->initial_cpb_removal_delay_length); // initial_cpb_removal_delay_offset yading@10: } yading@10: } yading@10: if (sps->vcl_hrd_parameters_present_flag) { yading@10: for (sched_sel_idx = 0; sched_sel_idx < sps->cpb_cnt; sched_sel_idx++) { yading@10: h->initial_cpb_removal_delay[sched_sel_idx] = get_bits_long(&h->gb, sps->initial_cpb_removal_delay_length); yading@10: skip_bits(&h->gb, sps->initial_cpb_removal_delay_length); // initial_cpb_removal_delay_offset yading@10: } yading@10: } yading@10: yading@10: h->sei_buffering_period_present = 1; yading@10: return 0; yading@10: } yading@10: yading@10: int ff_h264_decode_sei(H264Context *h){ yading@10: while (get_bits_left(&h->gb) > 16) { yading@10: int size, type; yading@10: yading@10: type=0; yading@10: do{ yading@10: if (get_bits_left(&h->gb) < 8) yading@10: return -1; yading@10: type+= show_bits(&h->gb, 8); yading@10: }while(get_bits(&h->gb, 8) == 255); yading@10: yading@10: size=0; yading@10: do{ yading@10: if (get_bits_left(&h->gb) < 8) yading@10: return -1; yading@10: size+= show_bits(&h->gb, 8); yading@10: }while(get_bits(&h->gb, 8) == 255); yading@10: yading@10: if(h->avctx->debug&FF_DEBUG_STARTCODE) yading@10: av_log(h->avctx, AV_LOG_DEBUG, "SEI %d len:%d\n", type, size); yading@10: yading@10: switch(type){ yading@10: case SEI_TYPE_PIC_TIMING: // Picture timing SEI yading@10: if(decode_picture_timing(h) < 0) yading@10: return -1; yading@10: break; yading@10: case SEI_TYPE_USER_DATA_ITU_T_T35: yading@10: if(decode_user_data_itu_t_t35(h, size) < 0) yading@10: return -1; yading@10: break; yading@10: case SEI_TYPE_USER_DATA_UNREGISTERED: yading@10: if(decode_unregistered_user_data(h, size) < 0) yading@10: return -1; yading@10: break; yading@10: case SEI_TYPE_RECOVERY_POINT: yading@10: if(decode_recovery_point(h) < 0) yading@10: return -1; yading@10: break; yading@10: case SEI_BUFFERING_PERIOD: yading@10: if(decode_buffering_period(h) < 0) yading@10: return -1; yading@10: break; yading@10: default: yading@10: skip_bits(&h->gb, 8*size); yading@10: } yading@10: yading@10: //FIXME check bits here yading@10: align_get_bits(&h->gb); yading@10: } yading@10: yading@10: return 0; yading@10: }