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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 | ||
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 | static void decode_nal_sei_frame_packing_arrangement(HEVCContext *s) | |
53 | { | |
54 | GetBitContext *gb = &s->HEVClc->gb; | |
55 | ||
56 | get_ue_golomb(gb); // frame_packing_arrangement_id | |
57 | s->sei_frame_packing_present = !get_bits1(gb); | |
58 | ||
59 | if (s->sei_frame_packing_present) { | |
60 | s->frame_packing_arrangement_type = get_bits(gb, 7); | |
61 | s->quincunx_subsampling = get_bits1(gb); | |
62 | s->content_interpretation_type = get_bits(gb, 6); | |
63 | ||
64 | // the following skips spatial_flipping_flag frame0_flipped_flag | |
65 | // field_views_flag current_frame_is_frame0_flag | |
66 | // frame0_self_contained_flag frame1_self_contained_flag | |
67 | skip_bits(gb, 6); | |
68 | ||
69 | if (!s->quincunx_subsampling && s->frame_packing_arrangement_type != 5) | |
70 | skip_bits(gb, 16); // frame[01]_grid_position_[xy] | |
71 | skip_bits(gb, 8); // frame_packing_arrangement_reserved_byte | |
72 | skip_bits1(gb); // frame_packing_arrangement_persistance_flag | |
73 | } | |
74 | skip_bits1(gb); // upsampled_aspect_ratio_flag | |
75 | } | |
76 | ||
77 | static void decode_nal_sei_display_orientation(HEVCContext *s) | |
78 | { | |
79 | GetBitContext *gb = &s->HEVClc->gb; | |
80 | ||
81 | s->sei_display_orientation_present = !get_bits1(gb); | |
82 | ||
83 | if (s->sei_display_orientation_present) { | |
84 | s->sei_hflip = get_bits1(gb); // hor_flip | |
85 | s->sei_vflip = get_bits1(gb); // ver_flip | |
86 | ||
87 | s->sei_anticlockwise_rotation = get_bits(gb, 16); | |
88 | skip_bits1(gb); // display_orientation_persistence_flag | |
89 | } | |
90 | } | |
91 | ||
92 | static int decode_pic_timing(HEVCContext *s) | |
93 | { | |
94 | GetBitContext *gb = &s->HEVClc->gb; | |
95 | HEVCSPS *sps; | |
96 | ||
97 | if (!s->sps_list[s->active_seq_parameter_set_id]) | |
98 | return(AVERROR(ENOMEM)); | |
99 | sps = (HEVCSPS*)s->sps_list[s->active_seq_parameter_set_id]->data; | |
100 | ||
101 | if (sps->vui.frame_field_info_present_flag) { | |
102 | int pic_struct = get_bits(gb, 4); | |
103 | s->picture_struct = AV_PICTURE_STRUCTURE_UNKNOWN; | |
104 | if (pic_struct == 2) { | |
105 | av_log(s->avctx, AV_LOG_DEBUG, "BOTTOM Field\n"); | |
106 | s->picture_struct = AV_PICTURE_STRUCTURE_BOTTOM_FIELD; | |
107 | } else if (pic_struct == 1) { | |
108 | av_log(s->avctx, AV_LOG_DEBUG, "TOP Field\n"); | |
109 | s->picture_struct = AV_PICTURE_STRUCTURE_TOP_FIELD; | |
110 | } | |
111 | get_bits(gb, 2); // source_scan_type | |
112 | get_bits(gb, 1); // duplicate_flag | |
113 | } | |
114 | return 1; | |
115 | } | |
116 | ||
117 | static int active_parameter_sets(HEVCContext *s) | |
118 | { | |
119 | GetBitContext *gb = &s->HEVClc->gb; | |
120 | int num_sps_ids_minus1; | |
121 | int i; | |
122 | unsigned active_seq_parameter_set_id; | |
123 | ||
124 | get_bits(gb, 4); // active_video_parameter_set_id | |
125 | get_bits(gb, 1); // self_contained_cvs_flag | |
126 | get_bits(gb, 1); // num_sps_ids_minus1 | |
127 | num_sps_ids_minus1 = get_ue_golomb_long(gb); // num_sps_ids_minus1 | |
128 | ||
129 | active_seq_parameter_set_id = get_ue_golomb_long(gb); | |
130 | if (active_seq_parameter_set_id >= MAX_SPS_COUNT) { | |
131 | av_log(s->avctx, AV_LOG_ERROR, "active_parameter_set_id %d invalid\n", active_seq_parameter_set_id); | |
132 | return AVERROR_INVALIDDATA; | |
133 | } | |
134 | s->active_seq_parameter_set_id = active_seq_parameter_set_id; | |
135 | ||
136 | for (i = 1; i <= num_sps_ids_minus1; i++) | |
137 | get_ue_golomb_long(gb); // active_seq_parameter_set_id[i] | |
138 | ||
139 | return 0; | |
140 | } | |
141 | ||
142 | static int decode_nal_sei_message(HEVCContext *s) | |
143 | { | |
144 | GetBitContext *gb = &s->HEVClc->gb; | |
145 | ||
146 | int payload_type = 0; | |
147 | int payload_size = 0; | |
148 | int byte = 0xFF; | |
149 | av_log(s->avctx, AV_LOG_DEBUG, "Decoding SEI\n"); | |
150 | ||
151 | while (byte == 0xFF) { | |
152 | byte = get_bits(gb, 8); | |
153 | payload_type += byte; | |
154 | } | |
155 | byte = 0xFF; | |
156 | while (byte == 0xFF) { | |
157 | byte = get_bits(gb, 8); | |
158 | payload_size += byte; | |
159 | } | |
160 | if (s->nal_unit_type == NAL_SEI_PREFIX) { | |
161 | if (payload_type == 256 /*&& s->decode_checksum_sei*/) { | |
162 | decode_nal_sei_decoded_picture_hash(s); | |
163 | } else if (payload_type == 45) { | |
164 | decode_nal_sei_frame_packing_arrangement(s); | |
165 | } else if (payload_type == 47) { | |
166 | decode_nal_sei_display_orientation(s); | |
167 | } else if (payload_type == 1){ | |
168 | int ret = decode_pic_timing(s); | |
169 | av_log(s->avctx, AV_LOG_DEBUG, "Skipped PREFIX SEI %d\n", payload_type); | |
170 | skip_bits(gb, 8 * payload_size); | |
171 | return ret; | |
172 | } else if (payload_type == 129){ | |
173 | active_parameter_sets(s); | |
174 | av_log(s->avctx, AV_LOG_DEBUG, "Skipped PREFIX SEI %d\n", payload_type); | |
175 | } else { | |
176 | av_log(s->avctx, AV_LOG_DEBUG, "Skipped PREFIX SEI %d\n", payload_type); | |
177 | skip_bits(gb, 8*payload_size); | |
178 | } | |
179 | } else { /* nal_unit_type == NAL_SEI_SUFFIX */ | |
180 | if (payload_type == 132 /* && s->decode_checksum_sei */) | |
181 | decode_nal_sei_decoded_picture_hash(s); | |
182 | else { | |
183 | av_log(s->avctx, AV_LOG_DEBUG, "Skipped SUFFIX SEI %d\n", payload_type); | |
184 | skip_bits(gb, 8 * payload_size); | |
185 | } | |
186 | } | |
187 | return 1; | |
188 | } | |
189 | ||
190 | static int more_rbsp_data(GetBitContext *gb) | |
191 | { | |
192 | return get_bits_left(gb) > 0 && show_bits(gb, 8) != 0x80; | |
193 | } | |
194 | ||
195 | int ff_hevc_decode_nal_sei(HEVCContext *s) | |
196 | { | |
197 | int ret; | |
198 | ||
199 | do { | |
200 | ret = decode_nal_sei_message(s); | |
201 | if (ret < 0) | |
202 | return(AVERROR(ENOMEM)); | |
203 | } while (more_rbsp_data(&s->HEVClc->gb)); | |
204 | return 1; | |
205 | } |