1/*
2 * This file is part of FFmpeg.
3 *
4 * FFmpeg is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU Lesser General Public
6 * License as published by the Free Software Foundation; either
7 * version 2.1 of the License, or (at your option) any later version.
8 *
9 * FFmpeg is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
12 * Lesser General Public License for more details.
13 *
14 * You should have received a copy of the GNU Lesser General Public
15 * License along with FFmpeg; if not, write to the Free Software
16 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
17 */
18
19#include "dynamic_hdr10_plus.h"
20#include "get_bits.h"
21
22static const int64_t luminance_den = 1;
23static const int32_t peak_luminance_den = 15;
24static const int64_t rgb_den = 100000;
25static const int32_t fraction_pixel_den = 1000;
26static const int32_t knee_point_den = 4095;
27static const int32_t bezier_anchor_den = 1023;
28static const int32_t saturation_weight_den = 8;
29
30int ff_parse_itu_t_t35_to_dynamic_hdr10_plus(AVDynamicHDRPlus *s, const uint8_t *data,
31                                             int size)
32{
33    GetBitContext gbc, *gb = &gbc;
34    int ret;
35
36    if (!s)
37        return AVERROR(ENOMEM);
38
39    ret = init_get_bits8(gb, data, size);
40    if (ret < 0)
41        return ret;
42
43    if (get_bits_left(gb) < 10)
44        return AVERROR_INVALIDDATA;
45
46    s->application_version = get_bits(gb, 8);
47    s->num_windows = get_bits(gb, 2);
48
49    if (s->num_windows < 1 || s->num_windows > 3) {
50        return AVERROR_INVALIDDATA;
51    }
52
53    if (get_bits_left(gb) < ((19 * 8 + 1) * (s->num_windows - 1)))
54        return AVERROR_INVALIDDATA;
55
56    for (int w = 1; w < s->num_windows; w++) {
57        // The corners are set to absolute coordinates here. They should be
58        // converted to the relative coordinates (in [0, 1]) in the decoder.
59        AVHDRPlusColorTransformParams *params = &s->params[w];
60        params->window_upper_left_corner_x =
61            (AVRational){get_bits(gb, 16), 1};
62        params->window_upper_left_corner_y =
63            (AVRational){get_bits(gb, 16), 1};
64        params->window_lower_right_corner_x =
65            (AVRational){get_bits(gb, 16), 1};
66        params->window_lower_right_corner_y =
67            (AVRational){get_bits(gb, 16), 1};
68
69        params->center_of_ellipse_x = get_bits(gb, 16);
70        params->center_of_ellipse_y = get_bits(gb, 16);
71        params->rotation_angle = get_bits(gb, 8);
72        params->semimajor_axis_internal_ellipse = get_bits(gb, 16);
73        params->semimajor_axis_external_ellipse = get_bits(gb, 16);
74        params->semiminor_axis_external_ellipse = get_bits(gb, 16);
75        params->overlap_process_option = get_bits1(gb);
76    }
77
78    if (get_bits_left(gb) < 28)
79        return AVERROR_INVALIDDATA;
80
81    s->targeted_system_display_maximum_luminance =
82        (AVRational){get_bits_long(gb, 27), luminance_den};
83    s->targeted_system_display_actual_peak_luminance_flag = get_bits1(gb);
84
85    if (s->targeted_system_display_actual_peak_luminance_flag) {
86        int rows, cols;
87        if (get_bits_left(gb) < 10)
88            return AVERROR_INVALIDDATA;
89        rows = get_bits(gb, 5);
90        cols = get_bits(gb, 5);
91        if (((rows < 2) || (rows > 25)) || ((cols < 2) || (cols > 25))) {
92            return AVERROR_INVALIDDATA;
93        }
94        s->num_rows_targeted_system_display_actual_peak_luminance = rows;
95        s->num_cols_targeted_system_display_actual_peak_luminance = cols;
96
97        if (get_bits_left(gb) < (rows * cols * 4))
98            return AVERROR_INVALIDDATA;
99
100        for (int i = 0; i < rows; i++) {
101            for (int j = 0; j < cols; j++) {
102                s->targeted_system_display_actual_peak_luminance[i][j] =
103                    (AVRational){get_bits(gb, 4), peak_luminance_den};
104            }
105        }
106    }
107    for (int w = 0; w < s->num_windows; w++) {
108        AVHDRPlusColorTransformParams *params = &s->params[w];
109        if (get_bits_left(gb) < (3 * 17 + 17 + 4))
110            return AVERROR_INVALIDDATA;
111
112        for (int i = 0; i < 3; i++) {
113            params->maxscl[i] =
114                (AVRational){get_bits(gb, 17), rgb_den};
115        }
116        params->average_maxrgb =
117            (AVRational){get_bits(gb, 17), rgb_den};
118        params->num_distribution_maxrgb_percentiles = get_bits(gb, 4);
119
120        if (get_bits_left(gb) <
121            (params->num_distribution_maxrgb_percentiles * 24))
122            return AVERROR_INVALIDDATA;
123
124        for (int i = 0; i < params->num_distribution_maxrgb_percentiles; i++) {
125            params->distribution_maxrgb[i].percentage = get_bits(gb, 7);
126            params->distribution_maxrgb[i].percentile =
127                (AVRational){get_bits(gb, 17), rgb_den};
128        }
129
130        if (get_bits_left(gb) < 10)
131            return AVERROR_INVALIDDATA;
132
133        params->fraction_bright_pixels = (AVRational){get_bits(gb, 10), fraction_pixel_den};
134    }
135    if (get_bits_left(gb) < 1)
136        return AVERROR_INVALIDDATA;
137    s->mastering_display_actual_peak_luminance_flag = get_bits1(gb);
138    if (s->mastering_display_actual_peak_luminance_flag) {
139        int rows, cols;
140        if (get_bits_left(gb) < 10)
141            return AVERROR_INVALIDDATA;
142        rows = get_bits(gb, 5);
143        cols = get_bits(gb, 5);
144        if (((rows < 2) || (rows > 25)) || ((cols < 2) || (cols > 25))) {
145            return AVERROR_INVALIDDATA;
146        }
147        s->num_rows_mastering_display_actual_peak_luminance = rows;
148        s->num_cols_mastering_display_actual_peak_luminance = cols;
149
150        if (get_bits_left(gb) < (rows * cols * 4))
151            return AVERROR_INVALIDDATA;
152
153        for (int i = 0; i < rows; i++) {
154            for (int j = 0; j < cols; j++) {
155                s->mastering_display_actual_peak_luminance[i][j] =
156                    (AVRational){get_bits(gb, 4), peak_luminance_den};
157            }
158        }
159    }
160
161    for (int w = 0; w < s->num_windows; w++) {
162        AVHDRPlusColorTransformParams *params = &s->params[w];
163        if (get_bits_left(gb) < 1)
164            return AVERROR_INVALIDDATA;
165
166        params->tone_mapping_flag = get_bits1(gb);
167        if (params->tone_mapping_flag) {
168            if (get_bits_left(gb) < 28)
169                return AVERROR_INVALIDDATA;
170
171            params->knee_point_x =
172                (AVRational){get_bits(gb, 12), knee_point_den};
173            params->knee_point_y =
174                (AVRational){get_bits(gb, 12), knee_point_den};
175            params->num_bezier_curve_anchors = get_bits(gb, 4);
176
177            if (get_bits_left(gb) < (params->num_bezier_curve_anchors * 10))
178                return AVERROR_INVALIDDATA;
179
180            for (int i = 0; i < params->num_bezier_curve_anchors; i++) {
181                params->bezier_curve_anchors[i] =
182                    (AVRational){get_bits(gb, 10), bezier_anchor_den};
183            }
184        }
185
186        if (get_bits_left(gb) < 1)
187            return AVERROR_INVALIDDATA;
188        params->color_saturation_mapping_flag = get_bits1(gb);
189        if (params->color_saturation_mapping_flag) {
190            if (get_bits_left(gb) < 6)
191                return AVERROR_INVALIDDATA;
192            params->color_saturation_weight =
193                (AVRational){get_bits(gb, 6), saturation_weight_den};
194        }
195    }
196
197    return 0;
198}
199