1 /*
2 * HEVC Supplementary Enhancement Information messages
3 *
4 * Copyright (C) 2012 - 2013 Guillaume Martres
5 * Copyright (C) 2012 - 2013 Gildas Cocherel
6 * Copyright (C) 2013 Vittorio Giovara
7 *
8 * This file is part of FFmpeg.
9 *
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.
14 *
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.
19 *
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
23 */
24
25 #include "golomb.h"
26 #include "hevc.h"
27
decode_nal_sei_decoded_picture_hash(HEVCContext * s)28 static void decode_nal_sei_decoded_picture_hash(HEVCContext *s)
29 {
30 int cIdx, i;
31 uint8_t hash_type;
32 //uint16_t picture_crc;
33 //uint32_t picture_checksum;
34 GetBitContext *gb = &s->HEVClc->gb;
35 hash_type = get_bits(gb, 8);
36
37 for (cIdx = 0; cIdx < 3/*((s->sps->chroma_format_idc == 0) ? 1 : 3)*/; cIdx++) {
38 if (hash_type == 0) {
39 s->is_md5 = 1;
40 for (i = 0; i < 16; i++)
41 s->md5[cIdx][i] = get_bits(gb, 8);
42 } else if (hash_type == 1) {
43 // picture_crc = get_bits(gb, 16);
44 skip_bits(gb, 16);
45 } else if (hash_type == 2) {
46 // picture_checksum = get_bits_long(gb, 32);
47 skip_bits(gb, 32);
48 }
49 }
50 }
51
52 #ifdef USE_FULL
decode_nal_sei_frame_packing_arrangement(HEVCContext * s)53 static void decode_nal_sei_frame_packing_arrangement(HEVCContext *s)
54 {
55 GetBitContext *gb = &s->HEVClc->gb;
56
57 get_ue_golomb(gb); // frame_packing_arrangement_id
58 s->sei_frame_packing_present = !get_bits1(gb);
59
60 if (s->sei_frame_packing_present) {
61 s->frame_packing_arrangement_type = get_bits(gb, 7);
62 s->quincunx_subsampling = get_bits1(gb);
63 s->content_interpretation_type = get_bits(gb, 6);
64
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
68 skip_bits(gb, 6);
69
70 if (!s->quincunx_subsampling && s->frame_packing_arrangement_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
74 }
75 skip_bits1(gb); // upsampled_aspect_ratio_flag
76 }
77
decode_nal_sei_display_orientation(HEVCContext * s)78 static void decode_nal_sei_display_orientation(HEVCContext *s)
79 {
80 GetBitContext *gb = &s->HEVClc->gb;
81
82 s->sei_display_orientation_present = !get_bits1(gb);
83
84 if (s->sei_display_orientation_present) {
85 s->sei_hflip = get_bits1(gb); // hor_flip
86 s->sei_vflip = get_bits1(gb); // ver_flip
87
88 s->sei_anticlockwise_rotation = get_bits(gb, 16);
89 skip_bits1(gb); // display_orientation_persistence_flag
90 }
91 }
92
decode_pic_timing(HEVCContext * s)93 static int decode_pic_timing(HEVCContext *s)
94 {
95 GetBitContext *gb = &s->HEVClc->gb;
96 HEVCSPS *sps;
97
98 if (!s->sps_list[s->active_seq_parameter_set_id])
99 return(AVERROR(ENOMEM));
100 sps = (HEVCSPS*)s->sps_list[s->active_seq_parameter_set_id]->data;
101
102 if (sps->vui.frame_field_info_present_flag) {
103 int pic_struct = get_bits(gb, 4);
104 s->picture_struct = AV_PICTURE_STRUCTURE_UNKNOWN;
105 if (pic_struct == 2) {
106 av_log(s->avctx, AV_LOG_DEBUG, "BOTTOM Field\n");
107 s->picture_struct = AV_PICTURE_STRUCTURE_BOTTOM_FIELD;
108 } else if (pic_struct == 1) {
109 av_log(s->avctx, AV_LOG_DEBUG, "TOP Field\n");
110 s->picture_struct = AV_PICTURE_STRUCTURE_TOP_FIELD;
111 }
112 get_bits(gb, 2); // source_scan_type
113 get_bits(gb, 1); // duplicate_flag
114 }
115 return 1;
116 }
117
active_parameter_sets(HEVCContext * s)118 static int active_parameter_sets(HEVCContext *s)
119 {
120 GetBitContext *gb = &s->HEVClc->gb;
121 int num_sps_ids_minus1;
122 int i;
123 unsigned active_seq_parameter_set_id;
124
125 get_bits(gb, 4); // active_video_parameter_set_id
126 get_bits(gb, 1); // self_contained_cvs_flag
127 get_bits(gb, 1); // num_sps_ids_minus1
128 num_sps_ids_minus1 = get_ue_golomb_long(gb); // num_sps_ids_minus1
129
130 active_seq_parameter_set_id = get_ue_golomb_long(gb);
131 if (active_seq_parameter_set_id >= MAX_SPS_COUNT) {
132 av_log(s->avctx, AV_LOG_ERROR, "active_parameter_set_id %d invalid\n", active_seq_parameter_set_id);
133 return AVERROR_INVALIDDATA;
134 }
135 s->active_seq_parameter_set_id = active_seq_parameter_set_id;
136
137 for (i = 1; i <= num_sps_ids_minus1; i++)
138 get_ue_golomb_long(gb); // active_seq_parameter_set_id[i]
139
140 return 0;
141 }
142 #endif
143
decode_nal_sei_message(HEVCContext * s)144 static int decode_nal_sei_message(HEVCContext *s)
145 {
146 GetBitContext *gb = &s->HEVClc->gb;
147
148 int payload_type = 0;
149 int payload_size = 0;
150 int byte = 0xFF;
151 av_log(s->avctx, AV_LOG_DEBUG, "Decoding SEI\n");
152
153 while (byte == 0xFF) {
154 byte = get_bits(gb, 8);
155 payload_type += byte;
156 }
157 byte = 0xFF;
158 while (byte == 0xFF) {
159 byte = get_bits(gb, 8);
160 payload_size += byte;
161 }
162 if (s->nal_unit_type == NAL_SEI_PREFIX) {
163 if (payload_type == 256 /*&& s->decode_checksum_sei*/) {
164 decode_nal_sei_decoded_picture_hash(s);
165 } else
166 #ifdef USE_FULL
167 if (payload_type == 45) {
168 decode_nal_sei_frame_packing_arrangement(s);
169 } else if (payload_type == 47) {
170 decode_nal_sei_display_orientation(s);
171 } else if (payload_type == 1){
172 int ret = decode_pic_timing(s);
173 av_log(s->avctx, AV_LOG_DEBUG, "Skipped PREFIX SEI %d\n", payload_type);
174 skip_bits(gb, 8 * payload_size);
175 return ret;
176 } else if (payload_type == 129){
177 active_parameter_sets(s);
178 av_log(s->avctx, AV_LOG_DEBUG, "Skipped PREFIX SEI %d\n", payload_type);
179 } else
180 #endif
181 #ifdef USE_FRAME_DURATION_SEI
182 if (payload_type == 257) {
183 /* frame duration in multiples of the frame rate period */
184 s->frame_duration = get_bits(gb, 16);
185 } else
186 #endif
187 {
188 av_log(s->avctx, AV_LOG_DEBUG, "Skipped PREFIX SEI %d\n", payload_type);
189 skip_bits(gb, 8*payload_size);
190 }
191 } else { /* nal_unit_type == NAL_SEI_SUFFIX */
192 if (payload_type == 132 /* && s->decode_checksum_sei */)
193 decode_nal_sei_decoded_picture_hash(s);
194 else {
195 av_log(s->avctx, AV_LOG_DEBUG, "Skipped SUFFIX SEI %d\n", payload_type);
196 skip_bits(gb, 8 * payload_size);
197 }
198 }
199 return 1;
200 }
201
more_rbsp_data(GetBitContext * gb)202 static int more_rbsp_data(GetBitContext *gb)
203 {
204 return get_bits_left(gb) > 0 && show_bits(gb, 8) != 0x80;
205 }
206
ff_hevc_decode_nal_sei(HEVCContext * s)207 int ff_hevc_decode_nal_sei(HEVCContext *s)
208 {
209 int ret;
210
211 do {
212 ret = decode_nal_sei_message(s);
213 if (ret < 0)
214 return(AVERROR(ENOMEM));
215 } while (more_rbsp_data(&s->HEVClc->gb));
216 return 1;
217 }
218