| /* |
| * H.26L/H.264/AVC/JVT/14496-10/... sei decoding |
| * Copyright (c) 2003 Michael Niedermayer <michaelni@gmx.at> |
| * |
| * This file is part of FFmpeg. |
| * |
| * FFmpeg 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. |
| * |
| * FFmpeg 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 FFmpeg; 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){ |
| MpegEncContext * const s = &h->s; |
| if(h->sps.nal_hrd_parameters_present_flag || h->sps.vcl_hrd_parameters_present_flag){ |
| h->sei_cpb_removal_delay = get_bits(&s->gb, h->sps.cpb_removal_delay_length); |
| h->sei_dpb_output_delay = get_bits(&s->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(&s->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(&s->gb, 1)){ /* clock_timestamp_flag */ |
| unsigned int full_timestamp_flag; |
| h->sei_ct_type |= 1<<get_bits(&s->gb, 2); |
| skip_bits(&s->gb, 1); /* nuit_field_based_flag */ |
| skip_bits(&s->gb, 5); /* counting_type */ |
| full_timestamp_flag = get_bits(&s->gb, 1); |
| skip_bits(&s->gb, 1); /* discontinuity_flag */ |
| skip_bits(&s->gb, 1); /* cnt_dropped_flag */ |
| skip_bits(&s->gb, 8); /* n_frames */ |
| if(full_timestamp_flag){ |
| skip_bits(&s->gb, 6); /* seconds_value 0..59 */ |
| skip_bits(&s->gb, 6); /* minutes_value 0..59 */ |
| skip_bits(&s->gb, 5); /* hours_value 0..23 */ |
| }else{ |
| if(get_bits(&s->gb, 1)){ /* seconds_flag */ |
| skip_bits(&s->gb, 6); /* seconds_value range 0..59 */ |
| if(get_bits(&s->gb, 1)){ /* minutes_flag */ |
| skip_bits(&s->gb, 6); /* minutes_value 0..59 */ |
| if(get_bits(&s->gb, 1)) /* hours_flag */ |
| skip_bits(&s->gb, 5); /* hours_value 0..23 */ |
| } |
| } |
| } |
| if(h->sps.time_offset_length > 0) |
| skip_bits(&s->gb, h->sps.time_offset_length); /* time_offset */ |
| } |
| } |
| |
| if(s->avctx->debug & FF_DEBUG_PICT_INFO) |
| av_log(s->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){ |
| MpegEncContext * const s = &h->s; |
| 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(&s->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(s->avctx->debug & FF_DEBUG_BUGS) |
| av_log(s->avctx, AV_LOG_DEBUG, "user data:\"%s\"\n", user_data+16); |
| |
| for(; i<size; i++) |
| skip_bits(&s->gb, 8); |
| |
| return 0; |
| } |
| |
| static int decode_recovery_point(H264Context *h){ |
| MpegEncContext * const s = &h->s; |
| |
| h->sei_recovery_frame_cnt = get_ue_golomb(&s->gb); |
| skip_bits(&s->gb, 4); /* 1b exact_match_flag, 1b broken_link_flag, 2b changing_slice_group_idc */ |
| |
| return 0; |
| } |
| |
| static int decode_buffering_period(H264Context *h){ |
| MpegEncContext * const s = &h->s; |
| unsigned int sps_id; |
| int sched_sel_idx; |
| SPS *sps; |
| |
| sps_id = get_ue_golomb_31(&s->gb); |
| if(sps_id > 31 || !h->sps_buffers[sps_id]) { |
| av_log(h->s.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(&s->gb, sps->initial_cpb_removal_delay_length); |
| skip_bits(&s->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(&s->gb, sps->initial_cpb_removal_delay_length); |
| skip_bits(&s->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){ |
| MpegEncContext * const s = &h->s; |
| |
| while(get_bits_count(&s->gb) + 16 < s->gb.size_in_bits){ |
| int size, type; |
| |
| type=0; |
| do{ |
| type+= show_bits(&s->gb, 8); |
| }while(get_bits(&s->gb, 8) == 255); |
| |
| size=0; |
| do{ |
| size+= show_bits(&s->gb, 8); |
| }while(get_bits(&s->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(&s->gb, 8*size); |
| } |
| |
| //FIXME check bits here |
| align_get_bits(&s->gb); |
| } |
| |
| return 0; |
| } |