mirror of https://github.com/FFmpeg/FFmpeg.git
Originally committed as revision 21168 to svn://svn.ffmpeg.org/ffmpeg/trunkrelease/0.6
Michael Niedermayer
15 years ago
parent
2edabfdfdb
commit
9c09546352
5 changed files with 219 additions and 180 deletions
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/*
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* H.26L/H.264/AVC/JVT/14496-10/... sei decoding |
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* Copyright (c) 2003 Michael Niedermayer <michaelni@gmx.at> |
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* |
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* This file is part of FFmpeg. |
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* |
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* FFmpeg is free software; you can redistribute it and/or |
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* modify it under the terms of the GNU Lesser General Public |
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* License as published by the Free Software Foundation; either |
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* version 2.1 of the License, or (at your option) any later version. |
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* |
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* FFmpeg is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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* Lesser General Public License for more details. |
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* |
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* You should have received a copy of the GNU Lesser General Public |
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* License along with FFmpeg; if not, write to the Free Software |
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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*/ |
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/**
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* @file libavcodec/h264-sei.c |
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* H.264 / AVC / MPEG4 part10 sei decoding. |
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* @author Michael Niedermayer <michaelni@gmx.at> |
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*/ |
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#include "internal.h" |
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#include "avcodec.h" |
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#include "h264.h" |
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#include "golomb.h" |
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//#undef NDEBUG
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#include <assert.h> |
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static const uint8_t sei_num_clock_ts_table[9]={ |
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1, 1, 1, 2, 2, 3, 3, 2, 3 |
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}; |
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void ff_h264_reset_sei(H264Context *h) { |
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h->sei_recovery_frame_cnt = -1; |
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h->sei_dpb_output_delay = 0; |
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h->sei_cpb_removal_delay = -1; |
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h->sei_buffering_period_present = 0; |
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} |
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static int decode_picture_timing(H264Context *h){ |
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MpegEncContext * const s = &h->s; |
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if(h->sps.nal_hrd_parameters_present_flag || h->sps.vcl_hrd_parameters_present_flag){ |
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h->sei_cpb_removal_delay = get_bits(&s->gb, h->sps.cpb_removal_delay_length); |
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h->sei_dpb_output_delay = get_bits(&s->gb, h->sps.dpb_output_delay_length); |
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} |
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if(h->sps.pic_struct_present_flag){ |
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unsigned int i, num_clock_ts; |
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h->sei_pic_struct = get_bits(&s->gb, 4); |
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h->sei_ct_type = 0; |
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if (h->sei_pic_struct > SEI_PIC_STRUCT_FRAME_TRIPLING) |
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return -1; |
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num_clock_ts = sei_num_clock_ts_table[h->sei_pic_struct]; |
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for (i = 0 ; i < num_clock_ts ; i++){ |
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if(get_bits(&s->gb, 1)){ /* clock_timestamp_flag */ |
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unsigned int full_timestamp_flag; |
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h->sei_ct_type |= 1<<get_bits(&s->gb, 2); |
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skip_bits(&s->gb, 1); /* nuit_field_based_flag */ |
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skip_bits(&s->gb, 5); /* counting_type */ |
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full_timestamp_flag = get_bits(&s->gb, 1); |
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skip_bits(&s->gb, 1); /* discontinuity_flag */ |
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skip_bits(&s->gb, 1); /* cnt_dropped_flag */ |
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skip_bits(&s->gb, 8); /* n_frames */ |
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if(full_timestamp_flag){ |
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skip_bits(&s->gb, 6); /* seconds_value 0..59 */ |
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skip_bits(&s->gb, 6); /* minutes_value 0..59 */ |
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skip_bits(&s->gb, 5); /* hours_value 0..23 */ |
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}else{ |
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if(get_bits(&s->gb, 1)){ /* seconds_flag */ |
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skip_bits(&s->gb, 6); /* seconds_value range 0..59 */ |
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if(get_bits(&s->gb, 1)){ /* minutes_flag */ |
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skip_bits(&s->gb, 6); /* minutes_value 0..59 */ |
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if(get_bits(&s->gb, 1)) /* hours_flag */ |
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skip_bits(&s->gb, 5); /* hours_value 0..23 */ |
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} |
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} |
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} |
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if(h->sps.time_offset_length > 0) |
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skip_bits(&s->gb, h->sps.time_offset_length); /* time_offset */ |
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} |
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} |
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if(s->avctx->debug & FF_DEBUG_PICT_INFO) |
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av_log(s->avctx, AV_LOG_DEBUG, "ct_type:%X pic_struct:%d\n", h->sei_ct_type, h->sei_pic_struct); |
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} |
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return 0; |
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} |
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static int decode_unregistered_user_data(H264Context *h, int size){ |
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MpegEncContext * const s = &h->s; |
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uint8_t user_data[16+256]; |
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int e, build, i; |
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if(size<16) |
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return -1; |
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for(i=0; i<sizeof(user_data)-1 && i<size; i++){ |
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user_data[i]= get_bits(&s->gb, 8); |
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} |
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user_data[i]= 0; |
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e= sscanf(user_data+16, "x264 - core %d"/*%s - H.264/MPEG-4 AVC codec - Copyleft 2005 - http://www.videolan.org/x264.html*/, &build); |
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if(e==1 && build>=0) |
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h->x264_build= build; |
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if(s->avctx->debug & FF_DEBUG_BUGS) |
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av_log(s->avctx, AV_LOG_DEBUG, "user data:\"%s\"\n", user_data+16); |
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for(; i<size; i++) |
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skip_bits(&s->gb, 8); |
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return 0; |
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} |
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static int decode_recovery_point(H264Context *h){ |
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MpegEncContext * const s = &h->s; |
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h->sei_recovery_frame_cnt = get_ue_golomb(&s->gb); |
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skip_bits(&s->gb, 4); /* 1b exact_match_flag, 1b broken_link_flag, 2b changing_slice_group_idc */ |
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return 0; |
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} |
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static int decode_buffering_period(H264Context *h){ |
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MpegEncContext * const s = &h->s; |
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unsigned int sps_id; |
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int sched_sel_idx; |
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SPS *sps; |
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sps_id = get_ue_golomb_31(&s->gb); |
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if(sps_id > 31 || !h->sps_buffers[sps_id]) { |
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av_log(h->s.avctx, AV_LOG_ERROR, "non-existing SPS %d referenced in buffering period\n", sps_id); |
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return -1; |
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} |
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sps = h->sps_buffers[sps_id]; |
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// NOTE: This is really so duplicated in the standard... See H.264, D.1.1
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if (sps->nal_hrd_parameters_present_flag) { |
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for (sched_sel_idx = 0; sched_sel_idx < sps->cpb_cnt; sched_sel_idx++) { |
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h->initial_cpb_removal_delay[sched_sel_idx] = get_bits(&s->gb, sps->initial_cpb_removal_delay_length); |
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skip_bits(&s->gb, sps->initial_cpb_removal_delay_length); // initial_cpb_removal_delay_offset
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} |
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} |
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if (sps->vcl_hrd_parameters_present_flag) { |
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for (sched_sel_idx = 0; sched_sel_idx < sps->cpb_cnt; sched_sel_idx++) { |
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h->initial_cpb_removal_delay[sched_sel_idx] = get_bits(&s->gb, sps->initial_cpb_removal_delay_length); |
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skip_bits(&s->gb, sps->initial_cpb_removal_delay_length); // initial_cpb_removal_delay_offset
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} |
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} |
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h->sei_buffering_period_present = 1; |
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return 0; |
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} |
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int ff_h264_decode_sei(H264Context *h){ |
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MpegEncContext * const s = &h->s; |
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while(get_bits_count(&s->gb) + 16 < s->gb.size_in_bits){ |
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int size, type; |
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type=0; |
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do{ |
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type+= show_bits(&s->gb, 8); |
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}while(get_bits(&s->gb, 8) == 255); |
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size=0; |
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do{ |
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size+= show_bits(&s->gb, 8); |
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}while(get_bits(&s->gb, 8) == 255); |
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switch(type){ |
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case SEI_TYPE_PIC_TIMING: // Picture timing SEI
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if(decode_picture_timing(h) < 0) |
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return -1; |
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break; |
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case SEI_TYPE_USER_DATA_UNREGISTERED: |
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if(decode_unregistered_user_data(h, size) < 0) |
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return -1; |
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break; |
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case SEI_TYPE_RECOVERY_POINT: |
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if(decode_recovery_point(h) < 0) |
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return -1; |
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break; |
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case SEI_BUFFERING_PERIOD: |
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if(decode_buffering_period(h) < 0) |
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return -1; |
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break; |
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default: |
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skip_bits(&s->gb, 8*size); |
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} |
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//FIXME check bits here
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align_get_bits(&s->gb); |
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} |
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return 0; |
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} |
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