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, int payload_size)
32 //uint16_t picture_crc;
33 //uint32_t picture_checksum;
34 GetBitContext *gb = &s->HEVClc.gb;
35 hash_type = get_bits(gb, 8);
38 for( cIdx = 0; cIdx < 3/*((s->sps->chroma_format_idc == 0) ? 1 : 3)*/; cIdx++ ) {
39 if ( hash_type == 0 ) {
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(HEVCLocalContext *lc)
56 GetBitContext *gb = &lc->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_nal_sei_message(HEVCContext *s)
82 GetBitContext *gb = &s->HEVClc.gb;
87 av_log(s->avctx, AV_LOG_DEBUG, "Decoding SEI\n");
89 while (byte == 0xFF) {
90 byte = get_bits(gb, 8);
94 while (byte == 0xFF) {
95 byte = get_bits(gb, 8);
98 if (s->nal_unit_type == NAL_SEI_PREFIX) {
99 if (payload_type == 256 /*&& s->decode_checksum_sei*/)
100 decode_nal_sei_decoded_picture_hash(s, payload_size);
101 else if (payload_type == 45)
102 decode_nal_sei_frame_packing_arrangement(&s->HEVClc);
104 av_log(s->avctx, AV_LOG_DEBUG, "Skipped PREFIX SEI %d\n", payload_type);
105 skip_bits(gb, 8*payload_size);
107 } else { /* nal_unit_type == NAL_SEI_SUFFIX */
108 if (payload_type == 132 /* && s->decode_checksum_sei */)
109 decode_nal_sei_decoded_picture_hash(s, payload_size);
111 av_log(s->avctx, AV_LOG_DEBUG, "Skipped SUFFIX SEI %d\n", payload_type);
112 skip_bits(gb, 8*payload_size);
118 static int more_rbsp_data(GetBitContext *gb)
120 return get_bits_left(gb) > 0 && show_bits(gb, 8) != 0x80;
123 int ff_hevc_decode_nal_sei(HEVCContext *s)
126 decode_nal_sei_message(s);
127 } while (more_rbsp_data(&s->HEVClc.gb));