2 * HEVC Supplementary Enhancement Information messages
4 * Copyright (C) 2012 - 2013 Guillaume Martres
5 * Copyright (C) 2012 - 2013 Gildas Cocherel
6 * Copyright (C) 2013 Vittorio Giovara
8 * This file is part of FFmpeg.
10 * FFmpeg is free software; you can redistribute it and/or
11 * modify it under the terms of the GNU Lesser General Public
12 * License as published by the Free Software Foundation; either
13 * version 2.1 of the License, or (at your option) any later version.
15 * FFmpeg is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
18 * Lesser General Public License for more details.
20 * You should have received a copy of the GNU Lesser General Public
21 * License along with FFmpeg; if not, write to the Free Software
22 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
28 static void decode_nal_sei_decoded_picture_hash(HEVCContext *s, int payload_size)
32 //uint16_t picture_crc;
33 //uint32_t picture_checksum;
34 GetBitContext *gb = &s->HEVClc->gb;
35 hash_type = get_bits(gb, 8);
38 for( cIdx = 0; cIdx < 3/*((s->sps->chroma_format_idc == 0) ? 1 : 3)*/; cIdx++ ) {
39 if ( hash_type == 0 ) {
41 for( i = 0; i < 16; i++) {
42 s->md5[cIdx][i] = get_bits(gb, 8);
44 } else if( hash_type == 1 ) {
45 // picture_crc = get_bits(gb, 16);
47 } else if( hash_type == 2 ) {
48 // picture_checksum = get_bits(gb, 32);
54 static void decode_nal_sei_frame_packing_arrangement(HEVCContext *s)
56 GetBitContext *gb = &s->HEVClc->gb;
57 int cancel, type, quincunx;
59 get_ue_golomb(gb); // frame_packing_arrangement_id
60 cancel = get_bits1(gb); // frame_packing_cancel_flag
63 type = get_bits(gb, 7); // frame_packing_arrangement_type
64 quincunx = get_bits1(gb); // quincunx_sampling_flag
65 skip_bits(gb, 6); // content_interpretation_type
67 // the following skips spatial_flipping_flag frame0_flipped_flag
68 // field_views_flag current_frame_is_frame0_flag
69 // frame0_self_contained_flag frame1_self_contained_flag
72 if ( quincunx == 0 && type != 5 )
73 skip_bits(gb, 16); // frame[01]_grid_position_[xy]
74 skip_bits(gb, 8); // frame_packing_arrangement_reserved_byte
75 skip_bits1(gb); // frame_packing_arrangement_persistance_flag
77 skip_bits1(gb); // upsampled_aspect_ratio_flag
80 static int decode_pic_timing(HEVCContext *s)
82 GetBitContext *gb = &s->HEVClc->gb;
83 HEVCSPS *sps = (HEVCSPS*)s->sps_list[s->active_seq_parameter_set_id]->data;
86 return(AVERROR(ENOMEM));
88 if (sps->vui.frame_field_info_present_flag) {
89 int pic_struct = get_bits(gb, 4);
90 s->picture_struct = AV_PICTURE_STRUCTURE_UNKNOWN;
91 if (pic_struct == 2) {
92 av_log(s->avctx, AV_LOG_DEBUG, "BOTTOM Field\n");
93 s->picture_struct = AV_PICTURE_STRUCTURE_BOTTOM_FIELD;
94 } else if (pic_struct == 1) {
95 av_log(s->avctx, AV_LOG_DEBUG, "TOP Field\n");
96 s->picture_struct = AV_PICTURE_STRUCTURE_TOP_FIELD;
98 get_bits(gb, 2); // source_scan_type
99 get_bits(gb, 1); // duplicate_flag
104 static void active_parameter_sets(HEVCContext *s) {
105 GetBitContext *gb = &s->HEVClc->gb;
106 int num_sps_ids_minus1;
109 get_bits(gb, 4); // active_video_parameter_set_id
110 get_bits(gb, 1); // self_contained_cvs_flag
111 get_bits(gb, 1); // num_sps_ids_minus1
112 num_sps_ids_minus1 = get_ue_golomb_long(gb); // num_sps_ids_minus1
114 s->active_seq_parameter_set_id = get_ue_golomb_long(gb);
116 for (i = 1; i <= num_sps_ids_minus1; i++)
117 get_ue_golomb_long(gb); // active_seq_parameter_set_id[i]
120 static int decode_nal_sei_message(HEVCContext *s)
122 GetBitContext *gb = &s->HEVClc->gb;
124 int payload_type = 0;
125 int payload_size = 0;
127 av_log(s->avctx, AV_LOG_DEBUG, "Decoding SEI\n");
129 while (byte == 0xFF) {
130 byte = get_bits(gb, 8);
131 payload_type += byte;
134 while (byte == 0xFF) {
135 byte = get_bits(gb, 8);
136 payload_size += byte;
138 if (s->nal_unit_type == NAL_SEI_PREFIX) {
139 if (payload_type == 256 /*&& s->decode_checksum_sei*/) {
140 decode_nal_sei_decoded_picture_hash(s, payload_size);
142 } else if (payload_type == 45) {
143 decode_nal_sei_frame_packing_arrangement(s);
145 } else if (payload_type == 1){
146 int ret = decode_pic_timing(s);
147 av_log(s->avctx, AV_LOG_DEBUG, "Skipped PREFIX SEI %d\n", payload_type);
148 skip_bits(gb, 8*payload_size);
150 } else if (payload_type == 129){
151 active_parameter_sets(s);
152 av_log(s->avctx, AV_LOG_DEBUG, "Skipped PREFIX SEI %d\n", payload_type);
155 av_log(s->avctx, AV_LOG_DEBUG, "Skipped PREFIX SEI %d\n", payload_type);
156 skip_bits(gb, 8*payload_size);
159 } else { /* nal_unit_type == NAL_SEI_SUFFIX */
160 if (payload_type == 132 /* && s->decode_checksum_sei */)
161 decode_nal_sei_decoded_picture_hash(s, payload_size);
163 av_log(s->avctx, AV_LOG_DEBUG, "Skipped SUFFIX SEI %d\n", payload_type);
164 skip_bits(gb, 8*payload_size);
170 static int more_rbsp_data(GetBitContext *gb)
172 return get_bits_left(gb) > 0 && show_bits(gb, 8) != 0x80;
175 int ff_hevc_decode_nal_sei(HEVCContext *s)
180 ret = decode_nal_sei_message(s);
182 return(AVERROR(ENOMEM));
183 } while (more_rbsp_data(&s->HEVClc->gb));