mirror of https://git.ffmpeg.org/ffmpeg.git
369 lines
12 KiB
C
369 lines
12 KiB
C
/*
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* HEVC Supplementary Enhancement Information messages
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*
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* Copyright (C) 2012 - 2013 Guillaume Martres
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* Copyright (C) 2012 - 2013 Gildas Cocherel
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* Copyright (C) 2013 Vittorio Giovara
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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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#include "golomb.h"
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#include "hevc_ps.h"
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#include "hevc_sei.h"
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static int decode_nal_sei_decoded_picture_hash(HEVCSEIPictureHash *s, GetBitContext *gb)
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{
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int cIdx, i;
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uint8_t hash_type;
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//uint16_t picture_crc;
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//uint32_t picture_checksum;
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hash_type = get_bits(gb, 8);
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for (cIdx = 0; cIdx < 3/*((s->sps->chroma_format_idc == 0) ? 1 : 3)*/; cIdx++) {
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if (hash_type == 0) {
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s->is_md5 = 1;
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for (i = 0; i < 16; i++)
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s->md5[cIdx][i] = get_bits(gb, 8);
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} else if (hash_type == 1) {
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// picture_crc = get_bits(gb, 16);
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skip_bits(gb, 16);
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} else if (hash_type == 2) {
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// picture_checksum = get_bits_long(gb, 32);
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skip_bits(gb, 32);
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}
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}
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return 0;
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}
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static int decode_nal_sei_mastering_display_info(HEVCSEIMasteringDisplay *s, GetBitContext *gb)
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{
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int i;
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// Mastering primaries
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for (i = 0; i < 3; i++) {
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s->display_primaries[i][0] = get_bits(gb, 16);
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s->display_primaries[i][1] = get_bits(gb, 16);
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}
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// White point (x, y)
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s->white_point[0] = get_bits(gb, 16);
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s->white_point[1] = get_bits(gb, 16);
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// Max and min luminance of mastering display
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s->max_luminance = get_bits_long(gb, 32);
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s->min_luminance = get_bits_long(gb, 32);
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// As this SEI message comes before the first frame that references it,
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// initialize the flag to 2 and decrement on IRAP access unit so it
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// persists for the coded video sequence (e.g., between two IRAPs)
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s->present = 2;
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return 0;
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}
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static int decode_nal_sei_content_light_info(HEVCSEIContentLight *s, GetBitContext *gb)
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{
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// Max and average light levels
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s->max_content_light_level = get_bits_long(gb, 16);
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s->max_pic_average_light_level = get_bits_long(gb, 16);
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// As this SEI message comes before the first frame that references it,
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// initialize the flag to 2 and decrement on IRAP access unit so it
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// persists for the coded video sequence (e.g., between two IRAPs)
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s->present = 2;
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return 0;
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}
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static int decode_nal_sei_frame_packing_arrangement(HEVCSEIFramePacking *s, GetBitContext *gb)
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{
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get_ue_golomb_long(gb); // frame_packing_arrangement_id
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s->present = !get_bits1(gb);
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if (s->present) {
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s->arrangement_type = get_bits(gb, 7);
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s->quincunx_subsampling = get_bits1(gb);
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s->content_interpretation_type = get_bits(gb, 6);
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// spatial_flipping_flag, frame0_flipped_flag, field_views_flag
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skip_bits(gb, 3);
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s->current_frame_is_frame0_flag = get_bits1(gb);
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// frame0_self_contained_flag, frame1_self_contained_flag
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skip_bits(gb, 2);
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if (!s->quincunx_subsampling && s->arrangement_type != 5)
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skip_bits(gb, 16); // frame[01]_grid_position_[xy]
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skip_bits(gb, 8); // frame_packing_arrangement_reserved_byte
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skip_bits1(gb); // frame_packing_arrangement_persistence_flag
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}
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skip_bits1(gb); // upsampled_aspect_ratio_flag
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return 0;
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}
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static int decode_nal_sei_display_orientation(HEVCSEIDisplayOrientation *s, GetBitContext *gb)
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{
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s->present = !get_bits1(gb);
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if (s->present) {
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s->hflip = get_bits1(gb); // hor_flip
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s->vflip = get_bits1(gb); // ver_flip
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s->anticlockwise_rotation = get_bits(gb, 16);
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skip_bits1(gb); // display_orientation_persistence_flag
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}
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return 0;
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}
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static int decode_nal_sei_pic_timing(HEVCSEI *s, GetBitContext *gb, const HEVCParamSets *ps,
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void *logctx, int size)
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{
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HEVCSEIPictureTiming *h = &s->picture_timing;
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HEVCSPS *sps;
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if (!ps->sps_list[s->active_seq_parameter_set_id])
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return(AVERROR(ENOMEM));
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sps = (HEVCSPS*)ps->sps_list[s->active_seq_parameter_set_id]->data;
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if (sps->vui.frame_field_info_present_flag) {
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int pic_struct = get_bits(gb, 4);
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h->picture_struct = AV_PICTURE_STRUCTURE_UNKNOWN;
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if (pic_struct == 2 || pic_struct == 10 || pic_struct == 12) {
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av_log(logctx, AV_LOG_DEBUG, "BOTTOM Field\n");
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h->picture_struct = AV_PICTURE_STRUCTURE_BOTTOM_FIELD;
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} else if (pic_struct == 1 || pic_struct == 9 || pic_struct == 11) {
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av_log(logctx, AV_LOG_DEBUG, "TOP Field\n");
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h->picture_struct = AV_PICTURE_STRUCTURE_TOP_FIELD;
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}
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get_bits(gb, 2); // source_scan_type
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get_bits(gb, 1); // duplicate_flag
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skip_bits1(gb);
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size--;
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}
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skip_bits_long(gb, 8 * size);
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return 0;
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}
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static int decode_registered_user_data_closed_caption(HEVCSEIA53Caption *s, GetBitContext *gb,
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int size)
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{
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int flag;
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int user_data_type_code;
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int cc_count;
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if (size < 3)
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return AVERROR(EINVAL);
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user_data_type_code = get_bits(gb, 8);
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if (user_data_type_code == 0x3) {
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skip_bits(gb, 1); // reserved
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flag = get_bits(gb, 1); // process_cc_data_flag
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if (flag) {
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skip_bits(gb, 1);
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cc_count = get_bits(gb, 5);
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skip_bits(gb, 8); // reserved
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size -= 2;
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if (cc_count && size >= cc_count * 3) {
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const uint64_t new_size = (s->a53_caption_size + cc_count
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* UINT64_C(3));
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int i, ret;
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if (new_size > INT_MAX)
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return AVERROR(EINVAL);
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/* Allow merging of the cc data from two fields. */
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ret = av_reallocp(&s->a53_caption, new_size);
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if (ret < 0)
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return ret;
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for (i = 0; i < cc_count; i++) {
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s->a53_caption[s->a53_caption_size++] = get_bits(gb, 8);
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s->a53_caption[s->a53_caption_size++] = get_bits(gb, 8);
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s->a53_caption[s->a53_caption_size++] = get_bits(gb, 8);
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}
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skip_bits(gb, 8); // marker_bits
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}
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}
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} else {
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int i;
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for (i = 0; i < size - 1; i++)
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skip_bits(gb, 8);
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}
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return 0;
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}
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static int decode_nal_sei_user_data_registered_itu_t_t35(HEVCSEI *s, GetBitContext *gb,
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int size)
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{
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uint32_t country_code;
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uint32_t user_identifier;
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if (size < 7)
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return AVERROR(EINVAL);
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size -= 7;
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country_code = get_bits(gb, 8);
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if (country_code == 0xFF) {
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skip_bits(gb, 8);
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size--;
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}
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skip_bits(gb, 8);
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skip_bits(gb, 8);
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user_identifier = get_bits_long(gb, 32);
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switch (user_identifier) {
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case MKBETAG('G', 'A', '9', '4'):
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return decode_registered_user_data_closed_caption(&s->a53_caption, gb, size);
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default:
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skip_bits_long(gb, size * 8);
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break;
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}
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return 0;
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}
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static int decode_nal_sei_active_parameter_sets(HEVCSEI *s, GetBitContext *gb, void *logctx)
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{
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int num_sps_ids_minus1;
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int i;
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unsigned active_seq_parameter_set_id;
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get_bits(gb, 4); // active_video_parameter_set_id
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get_bits(gb, 1); // self_contained_cvs_flag
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get_bits(gb, 1); // num_sps_ids_minus1
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num_sps_ids_minus1 = get_ue_golomb_long(gb); // num_sps_ids_minus1
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if (num_sps_ids_minus1 < 0 || num_sps_ids_minus1 > 15) {
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av_log(logctx, AV_LOG_ERROR, "num_sps_ids_minus1 %d invalid\n", num_sps_ids_minus1);
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return AVERROR_INVALIDDATA;
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}
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active_seq_parameter_set_id = get_ue_golomb_long(gb);
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if (active_seq_parameter_set_id >= HEVC_MAX_SPS_COUNT) {
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av_log(logctx, AV_LOG_ERROR, "active_parameter_set_id %d invalid\n", active_seq_parameter_set_id);
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return AVERROR_INVALIDDATA;
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}
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s->active_seq_parameter_set_id = active_seq_parameter_set_id;
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for (i = 1; i <= num_sps_ids_minus1; i++)
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get_ue_golomb_long(gb); // active_seq_parameter_set_id[i]
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return 0;
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}
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static int decode_nal_sei_alternative_transfer(HEVCSEIAlternativeTransfer *s, GetBitContext *gb)
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{
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s->present = 1;
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s->preferred_transfer_characteristics = get_bits(gb, 8);
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return 0;
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}
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static int decode_nal_sei_prefix(GetBitContext *gb, void *logctx, HEVCSEI *s,
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const HEVCParamSets *ps, int type, int size)
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{
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switch (type) {
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case 256: // Mismatched value from HM 8.1
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return decode_nal_sei_decoded_picture_hash(&s->picture_hash, gb);
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case HEVC_SEI_TYPE_FRAME_PACKING:
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return decode_nal_sei_frame_packing_arrangement(&s->frame_packing, gb);
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case HEVC_SEI_TYPE_DISPLAY_ORIENTATION:
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return decode_nal_sei_display_orientation(&s->display_orientation, gb);
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case HEVC_SEI_TYPE_PICTURE_TIMING:
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return decode_nal_sei_pic_timing(s, gb, ps, logctx, size);
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case HEVC_SEI_TYPE_MASTERING_DISPLAY_INFO:
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return decode_nal_sei_mastering_display_info(&s->mastering_display, gb);
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case HEVC_SEI_TYPE_CONTENT_LIGHT_LEVEL_INFO:
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return decode_nal_sei_content_light_info(&s->content_light, gb);
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case HEVC_SEI_TYPE_ACTIVE_PARAMETER_SETS:
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return decode_nal_sei_active_parameter_sets(s, gb, logctx);
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case HEVC_SEI_TYPE_USER_DATA_REGISTERED_ITU_T_T35:
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return decode_nal_sei_user_data_registered_itu_t_t35(s, gb, size);
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case HEVC_SEI_TYPE_ALTERNATIVE_TRANSFER_CHARACTERISTICS:
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return decode_nal_sei_alternative_transfer(&s->alternative_transfer, gb);
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default:
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av_log(logctx, AV_LOG_DEBUG, "Skipped PREFIX SEI %d\n", type);
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skip_bits_long(gb, 8 * size);
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return 0;
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}
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}
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static int decode_nal_sei_suffix(GetBitContext *gb, void *logctx, HEVCSEI *s,
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int type, int size)
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{
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switch (type) {
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case HEVC_SEI_TYPE_DECODED_PICTURE_HASH:
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return decode_nal_sei_decoded_picture_hash(&s->picture_hash, gb);
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default:
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av_log(logctx, AV_LOG_DEBUG, "Skipped SUFFIX SEI %d\n", type);
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skip_bits_long(gb, 8 * size);
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return 0;
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}
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}
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static int decode_nal_sei_message(GetBitContext *gb, void *logctx, HEVCSEI *s,
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const HEVCParamSets *ps, int nal_unit_type)
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{
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int payload_type = 0;
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int payload_size = 0;
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int byte = 0xFF;
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av_log(logctx, AV_LOG_DEBUG, "Decoding SEI\n");
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while (byte == 0xFF) {
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if (get_bits_left(gb) < 16 || payload_type > INT_MAX - 255)
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return AVERROR_INVALIDDATA;
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byte = get_bits(gb, 8);
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payload_type += byte;
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}
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byte = 0xFF;
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while (byte == 0xFF) {
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if (get_bits_left(gb) < 8 + 8LL*payload_size)
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return AVERROR_INVALIDDATA;
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byte = get_bits(gb, 8);
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payload_size += byte;
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}
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if (nal_unit_type == HEVC_NAL_SEI_PREFIX) {
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return decode_nal_sei_prefix(gb, logctx, s, ps, payload_type, payload_size);
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} else { /* nal_unit_type == NAL_SEI_SUFFIX */
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return decode_nal_sei_suffix(gb, logctx, s, payload_type, payload_size);
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}
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}
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static int more_rbsp_data(GetBitContext *gb)
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{
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return get_bits_left(gb) > 0 && show_bits(gb, 8) != 0x80;
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}
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int ff_hevc_decode_nal_sei(GetBitContext *gb, void *logctx, HEVCSEI *s,
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const HEVCParamSets *ps, int type)
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{
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int ret;
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do {
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ret = decode_nal_sei_message(gb, logctx, s, ps, type);
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if (ret < 0)
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return ret;
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} while (more_rbsp_data(gb));
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return 1;
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}
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void ff_hevc_reset_sei(HEVCSEI *s)
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{
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s->a53_caption.a53_caption_size = 0;
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av_freep(&s->a53_caption.a53_caption);
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}
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