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