FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavutil/tdrdi.h
Date: 2025-07-02 09:19:21
Exec Total Coverage
Lines: 4 4 100.0%
Functions: 1 1 100.0%
Branches: 1 2 50.0%
Line Branch Exec Source
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 /**
20 * @file
21 * @ingroup lavu_video_3d_reference_displays_info
22 * Spherical video
23 */
24
25 #ifndef AVUTIL_TDRDI_H
26 #define AVUTIL_TDRDI_H
27
28 #include <stddef.h>
29 #include <stdint.h>
30
31 #include "libavutil/avassert.h"
32
33 /**
34 * @defgroup lavu_video_3d_reference_displays_info 3D Reference Displays Information
35 * @ingroup lavu_video
36 *
37 * The 3D Reference Displays Information describes information about the reference display
38 * width(s) and reference viewing distance(s) as well as information about the corresponding
39 * reference stereo pair(s).
40 * @{
41 */
42
43 #define AV_TDRDI_MAX_NUM_REF_DISPLAY 32
44
45 /**
46 * This structure describes information about the reference display width(s) and reference
47 * viewing distance(s) as well as information about the corresponding reference stereo pair(s).
48 * See section G.14.3.2.3 of ITU-T H.265 for more information.
49 *
50 * @note The struct must be allocated with av_tdrdi_alloc() and
51 * its size is not a part of the public ABI.
52 */
53 typedef struct AV3DReferenceDisplaysInfo {
54 /**
55 * The exponent of the maximum allowable truncation error for
56 * {exponent,mantissa}_ref_display_width as given by 2<sup>(-prec_ref_display_width)</sup>.
57 */
58 uint8_t prec_ref_display_width;
59
60 /**
61 * A flag to indicate the presence of reference viewing distance.
62 * If false, the values of prec_ref_viewing_dist, exponent_ref_viewing_distance,
63 * and mantissa_ref_viewing_distance are undefined.
64 */
65 uint8_t ref_viewing_distance_flag;
66
67 /**
68 * The exponent of the maximum allowable truncation error for
69 * {exponent,mantissa}_ref_viewing_distance as given by 2<sup>^(-prec_ref_viewing_dist)</sup>.
70 * The value of prec_ref_viewing_dist shall be in the range of 0 to 31, inclusive.
71 */
72 uint8_t prec_ref_viewing_dist;
73
74 /**
75 * The number of reference displays that are signalled in this struct.
76 * Allowed range is 1 to 32, inclusive.
77 */
78 uint8_t num_ref_displays;
79
80 /**
81 * Offset in bytes from the beginning of this structure at which the array
82 * of reference displays starts.
83 */
84 size_t entries_offset;
85
86 /**
87 * Size of each entry in bytes. May not match sizeof(AV3DReferenceDisplay).
88 */
89 size_t entry_size;
90 } AV3DReferenceDisplaysInfo;
91
92 /**
93 * Data structure for single deference display information.
94 * It is allocated as a part of AV3DReferenceDisplaysInfo and should be retrieved with
95 * av_tdrdi_get_display().
96 *
97 * sizeof(AV3DReferenceDisplay) is not a part of the ABI and new fields may be
98 * added to it.
99 */
100 typedef struct AV3DReferenceDisplay {
101 /**
102 * The ViewId of the left view of a stereo pair corresponding to the n-th reference display.
103 */
104 uint16_t left_view_id;
105
106 /**
107 * The ViewId of the left view of a stereo pair corresponding to the n-th reference display.
108 */
109 uint16_t right_view_id;
110
111 /**
112 * The exponent part of the reference display width of the n-th reference display.
113 */
114 uint8_t exponent_ref_display_width;
115
116 /**
117 * The mantissa part of the reference display width of the n-th reference display.
118 */
119 uint8_t mantissa_ref_display_width;
120
121 /**
122 * Tthe exponent part of the reference viewing distance of the n-th reference display.
123 */
124 uint8_t exponent_ref_viewing_distance;
125
126 /**
127 * The mantissa part of the reference viewing distance of the n-th reference display.
128 */
129 uint8_t mantissa_ref_viewing_distance;
130
131 /**
132 * An array of flags to indicates that the information about additional horizontal shift of
133 * the left and right views for the n-th reference display is present.
134 */
135 uint8_t additional_shift_present_flag;
136
137 /**
138 * The recommended additional horizontal shift for a stereo pair corresponding to the n-th
139 * reference baseline and the n-th reference display.
140 */
141 int16_t num_sample_shift;
142 } AV3DReferenceDisplay;
143
144 static av_always_inline AV3DReferenceDisplay*
145 4 av_tdrdi_get_display(AV3DReferenceDisplaysInfo *tdrdi, unsigned int idx)
146 {
147
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 4 av_assert0(idx < tdrdi->num_ref_displays);
148 8 return (AV3DReferenceDisplay *)((uint8_t *)tdrdi + tdrdi->entries_offset +
149 4 idx * tdrdi->entry_size);
150 }
151
152 /**
153 * Allocate a AV3DReferenceDisplaysInfo structure and initialize its fields to default
154 * values.
155 *
156 * @return the newly allocated struct or NULL on failure
157 */
158 AV3DReferenceDisplaysInfo *av_tdrdi_alloc(unsigned int nb_displays, size_t *size);
159
160 /**
161 * @}
162 */
163
164 #endif /* AVUTIL_TDRDI_H */
165