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,
33 //uint16_t picture_crc;
34 //uint32_t picture_checksum;
35 GetBitContext *gb = &s->HEVClc->gb;
36 hash_type = get_bits(gb, 8);
38 for (cIdx = 0; cIdx < 3/*((s->sps->chroma_format_idc == 0) ? 1 : 3)*/; cIdx++) {
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)
106 GetBitContext *gb = &s->HEVClc->gb;
107 int num_sps_ids_minus1;
110 get_bits(gb, 4); // active_video_parameter_set_id
111 get_bits(gb, 1); // self_contained_cvs_flag
112 get_bits(gb, 1); // num_sps_ids_minus1
113 num_sps_ids_minus1 = get_ue_golomb_long(gb); // num_sps_ids_minus1
115 s->active_seq_parameter_set_id = get_ue_golomb_long(gb);
117 for (i = 1; i <= num_sps_ids_minus1; i++)
118 get_ue_golomb_long(gb); // active_seq_parameter_set_id[i]
121 static int decode_nal_sei_message(HEVCContext *s)
123 GetBitContext *gb = &s->HEVClc->gb;
125 int payload_type = 0;
126 int payload_size = 0;
128 av_log(s->avctx, AV_LOG_DEBUG, "Decoding SEI\n");
130 while (byte == 0xFF) {
131 byte = get_bits(gb, 8);
132 payload_type += byte;
135 while (byte == 0xFF) {
136 byte = get_bits(gb, 8);
137 payload_size += byte;
139 if (s->nal_unit_type == NAL_SEI_PREFIX) {
140 if (payload_type == 256 /*&& s->decode_checksum_sei*/) {
141 decode_nal_sei_decoded_picture_hash(s, payload_size);
143 } else if (payload_type == 45) {
144 decode_nal_sei_frame_packing_arrangement(s);
146 } else if (payload_type == 1){
147 int ret = decode_pic_timing(s);
148 av_log(s->avctx, AV_LOG_DEBUG, "Skipped PREFIX SEI %d\n", payload_type);
149 skip_bits(gb, 8*payload_size);
151 } else if (payload_type == 129){
152 active_parameter_sets(s);
153 av_log(s->avctx, AV_LOG_DEBUG, "Skipped PREFIX SEI %d\n", payload_type);
156 av_log(s->avctx, AV_LOG_DEBUG, "Skipped PREFIX SEI %d\n", payload_type);
157 skip_bits(gb, 8*payload_size);
160 } else { /* nal_unit_type == NAL_SEI_SUFFIX */
161 if (payload_type == 132 /* && s->decode_checksum_sei */)
162 decode_nal_sei_decoded_picture_hash(s, payload_size);
164 av_log(s->avctx, AV_LOG_DEBUG, "Skipped SUFFIX SEI %d\n", payload_type);
165 skip_bits(gb, 8*payload_size);
171 static int more_rbsp_data(GetBitContext *gb)
173 return get_bits_left(gb) > 0 && show_bits(gb, 8) != 0x80;
176 int ff_hevc_decode_nal_sei(HEVCContext *s)
181 ret = decode_nal_sei_message(s);
183 return(AVERROR(ENOMEM));
184 } while (more_rbsp_data(&s->HEVClc->gb));