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);
43 } else if (hash_type == 1) {
44 // picture_crc = get_bits(gb, 16);
46 } else if (hash_type == 2) {
47 // picture_checksum = get_bits(gb, 32);
53 static void decode_nal_sei_frame_packing_arrangement(HEVCContext *s)
55 GetBitContext *gb = &s->HEVClc->gb;
56 int cancel, type, quincunx;
58 get_ue_golomb(gb); // frame_packing_arrangement_id
59 cancel = get_bits1(gb); // frame_packing_cancel_flag
61 type = get_bits(gb, 7); // frame_packing_arrangement_type
62 quincunx = get_bits1(gb); // quincunx_sampling_flag
63 skip_bits(gb, 6); // content_interpretation_type
65 // the following skips spatial_flipping_flag frame0_flipped_flag
66 // field_views_flag current_frame_is_frame0_flag
67 // frame0_self_contained_flag frame1_self_contained_flag
70 if (quincunx == 0 && type != 5)
71 skip_bits(gb, 16); // frame[01]_grid_position_[xy]
72 skip_bits(gb, 8); // frame_packing_arrangement_reserved_byte
73 skip_bits1(gb); // frame_packing_arrangement_persistance_flag
75 skip_bits1(gb); // upsampled_aspect_ratio_flag
78 static int decode_pic_timing(HEVCContext *s)
80 GetBitContext *gb = &s->HEVClc->gb;
83 if (!s->sps_list[s->active_seq_parameter_set_id])
84 return(AVERROR(ENOMEM));
85 sps = (HEVCSPS*)s->sps_list[s->active_seq_parameter_set_id]->data;
87 if (sps->vui.frame_field_info_present_flag) {
88 int pic_struct = get_bits(gb, 4);
89 s->picture_struct = AV_PICTURE_STRUCTURE_UNKNOWN;
90 if (pic_struct == 2) {
91 av_log(s->avctx, AV_LOG_DEBUG, "BOTTOM Field\n");
92 s->picture_struct = AV_PICTURE_STRUCTURE_BOTTOM_FIELD;
93 } else if (pic_struct == 1) {
94 av_log(s->avctx, AV_LOG_DEBUG, "TOP Field\n");
95 s->picture_struct = AV_PICTURE_STRUCTURE_TOP_FIELD;
97 get_bits(gb, 2); // source_scan_type
98 get_bits(gb, 1); // duplicate_flag
103 static int active_parameter_sets(HEVCContext *s)
105 GetBitContext *gb = &s->HEVClc->gb;
106 int num_sps_ids_minus1;
108 unsigned active_seq_parameter_set_id;
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 active_seq_parameter_set_id = get_ue_golomb_long(gb);
116 if (active_seq_parameter_set_id >= MAX_SPS_COUNT) {
117 av_log(s->avctx, AV_LOG_ERROR, "active_parameter_set_id %d invalid\n", active_seq_parameter_set_id);
118 return AVERROR_INVALIDDATA;
120 s->active_seq_parameter_set_id = active_seq_parameter_set_id;
122 for (i = 1; i <= num_sps_ids_minus1; i++)
123 get_ue_golomb_long(gb); // active_seq_parameter_set_id[i]
128 static int decode_nal_sei_message(HEVCContext *s)
130 GetBitContext *gb = &s->HEVClc->gb;
132 int payload_type = 0;
133 int payload_size = 0;
135 av_log(s->avctx, AV_LOG_DEBUG, "Decoding SEI\n");
137 while (byte == 0xFF) {
138 byte = get_bits(gb, 8);
139 payload_type += byte;
142 while (byte == 0xFF) {
143 byte = get_bits(gb, 8);
144 payload_size += byte;
146 if (s->nal_unit_type == NAL_SEI_PREFIX) {
147 if (payload_type == 256 /*&& s->decode_checksum_sei*/) {
148 decode_nal_sei_decoded_picture_hash(s, payload_size);
150 } else if (payload_type == 45) {
151 decode_nal_sei_frame_packing_arrangement(s);
153 } else if (payload_type == 1){
154 int ret = decode_pic_timing(s);
155 av_log(s->avctx, AV_LOG_DEBUG, "Skipped PREFIX SEI %d\n", payload_type);
156 skip_bits(gb, 8 * payload_size);
158 } else if (payload_type == 129){
159 active_parameter_sets(s);
160 av_log(s->avctx, AV_LOG_DEBUG, "Skipped PREFIX SEI %d\n", payload_type);
163 av_log(s->avctx, AV_LOG_DEBUG, "Skipped PREFIX SEI %d\n", payload_type);
164 skip_bits(gb, 8*payload_size);
167 } else { /* nal_unit_type == NAL_SEI_SUFFIX */
168 if (payload_type == 132 /* && s->decode_checksum_sei */)
169 decode_nal_sei_decoded_picture_hash(s, payload_size);
171 av_log(s->avctx, AV_LOG_DEBUG, "Skipped SUFFIX SEI %d\n", payload_type);
172 skip_bits(gb, 8 * payload_size);
178 static int more_rbsp_data(GetBitContext *gb)
180 return get_bits_left(gb) > 0 && show_bits(gb, 8) != 0x80;
183 int ff_hevc_decode_nal_sei(HEVCContext *s)
188 ret = decode_nal_sei_message(s);
190 return(AVERROR(ENOMEM));
191 } while (more_rbsp_data(&s->HEVClc->gb));