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 Libav.
10 * Libav 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 * Libav 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 Libav; 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)
31 GetBitContext *gb = &s->HEVClc.gb;
32 uint8_t hash_type = get_bits(gb, 8);
34 for (cIdx = 0; cIdx < 3; cIdx++) {
37 for (i = 0; i < 16; i++)
38 s->md5[cIdx][i] = get_bits(gb, 8);
39 } else if (hash_type == 1) {
40 // picture_crc = get_bits(gb, 16);
42 } else if (hash_type == 2) {
43 // picture_checksum = get_bits(gb, 32);
49 static void decode_nal_sei_frame_packing_arrangement(HEVCContext *s)
51 GetBitContext *gb = &s->HEVClc.gb;
53 get_ue_golomb(gb); // frame_packing_arrangement_id
54 s->sei_frame_packing_present = !get_bits1(gb);
56 if (s->sei_frame_packing_present) {
57 s->frame_packing_arrangement_type = get_bits(gb, 7);
58 s->quincunx_subsampling = get_bits1(gb);
59 s->content_interpretation_type = get_bits(gb, 6);
61 // the following skips spatial_flipping_flag frame0_flipped_flag
62 // field_views_flag current_frame_is_frame0_flag
63 // frame0_self_contained_flag frame1_self_contained_flag
66 if (!s->quincunx_subsampling && s->frame_packing_arrangement_type != 5)
67 skip_bits(gb, 16); // frame[01]_grid_position_[xy]
68 skip_bits(gb, 8); // frame_packing_arrangement_reserved_byte
69 skip_bits1(gb); // frame_packing_arrangement_persistance_flag
71 skip_bits1(gb); // upsampled_aspect_ratio_flag
74 static int decode_nal_sei_message(HEVCContext *s)
76 GetBitContext *gb = &s->HEVClc.gb;
81 av_log(s->avctx, AV_LOG_DEBUG, "Decoding SEI\n");
83 while (byte == 0xFF) {
84 byte = get_bits(gb, 8);
88 while (byte == 0xFF) {
89 byte = get_bits(gb, 8);
92 if (s->nal_unit_type == NAL_SEI_PREFIX) {
93 if (payload_type == 256)
94 decode_nal_sei_decoded_picture_hash(s);
95 else if (payload_type == 45)
96 decode_nal_sei_frame_packing_arrangement(s);
98 av_log(s->avctx, AV_LOG_DEBUG, "Skipped PREFIX SEI %d\n", payload_type);
99 skip_bits(gb, 8 * payload_size);
101 } else { /* nal_unit_type == NAL_SEI_SUFFIX */
102 if (payload_type == 132)
103 decode_nal_sei_decoded_picture_hash(s);
105 av_log(s->avctx, AV_LOG_DEBUG, "Skipped SUFFIX SEI %d\n", payload_type);
106 skip_bits(gb, 8 * payload_size);
112 static int more_rbsp_data(GetBitContext *gb)
114 return get_bits_left(gb) > 0 && show_bits(gb, 8) != 0x80;
117 int ff_hevc_decode_nal_sei(HEVCContext *s)
120 decode_nal_sei_message(s);
121 } while (more_rbsp_data(&s->HEVClc.gb));