1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
|
/*
* Common H.264/HEVC VUI Parameter decoding
*
* Copyright (c) 2003 Michael Niedermayer <michaelni@gmx.at>
* Copyright (C) 2012 - 2013 Guillaume Martres
* Copyright (C) 2012 - 2013 Mickael Raulet
* Copyright (C) 2012 - 2013 Gildas Cocherel
* Copyright (C) 2013 Vittorio Giovara
*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "libavutil/log.h"
#include "libavutil/pixdesc.h"
#include "get_bits.h"
#include "golomb.h"
#include "h2645data.h"
#include "h2645_vui.h"
#define EXTENDED_SAR 255
void ff_h2645_decode_common_vui_params(GetBitContext *gb, H2645VUI *vui, void *logctx)
{
int aspect_ratio_info_present_flag;
av_log(logctx, AV_LOG_DEBUG, "Decoding VUI\n");
aspect_ratio_info_present_flag = get_bits1(gb);
if (aspect_ratio_info_present_flag) {
uint8_t aspect_ratio_idc = get_bits(gb, 8);
if (aspect_ratio_idc < FF_ARRAY_ELEMS(ff_h2645_pixel_aspect))
vui->sar = ff_h2645_pixel_aspect[aspect_ratio_idc];
else if (aspect_ratio_idc == EXTENDED_SAR) {
vui->sar.num = get_bits(gb, 16);
vui->sar.den = get_bits(gb, 16);
} else
av_log(logctx, AV_LOG_WARNING,
"Unknown SAR index: %u.\n", aspect_ratio_idc);
} else
vui->sar = (AVRational){ 0, 1 };
vui->overscan_info_present_flag = get_bits1(gb);
if (vui->overscan_info_present_flag)
vui->overscan_appropriate_flag = get_bits1(gb);
vui->video_signal_type_present_flag = get_bits1(gb);
if (vui->video_signal_type_present_flag) {
vui->video_format = get_bits(gb, 3);
vui->video_full_range_flag = get_bits1(gb);
vui->colour_description_present_flag = get_bits1(gb);
if (vui->colour_description_present_flag) {
vui->colour_primaries = get_bits(gb, 8);
vui->transfer_characteristics = get_bits(gb, 8);
vui->matrix_coeffs = get_bits(gb, 8);
// Set invalid values to "unspecified"
if (!av_color_primaries_name(vui->colour_primaries))
vui->colour_primaries = AVCOL_PRI_UNSPECIFIED;
if (!av_color_transfer_name(vui->transfer_characteristics))
vui->transfer_characteristics = AVCOL_TRC_UNSPECIFIED;
if (!av_color_space_name(vui->matrix_coeffs))
vui->matrix_coeffs = AVCOL_SPC_UNSPECIFIED;
}
}
vui->chroma_loc_info_present_flag = get_bits1(gb);
if (vui->chroma_loc_info_present_flag) {
vui->chroma_sample_loc_type_top_field = get_ue_golomb_31(gb);
vui->chroma_sample_loc_type_bottom_field = get_ue_golomb_31(gb);
if (vui->chroma_sample_loc_type_top_field <= 5U)
vui->chroma_location = vui->chroma_sample_loc_type_top_field + 1;
else
vui->chroma_location = AVCHROMA_LOC_UNSPECIFIED;
} else
vui->chroma_location = AVCHROMA_LOC_LEFT;
}
|
