aboutsummaryrefslogtreecommitdiffstats
path: root/libavutil/stereo3d.h
blob: d421aac2a26b12feb5ef94f5e5441832df556f48 (plain) (blame)
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
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
/*
 * Copyright (c) 2013 Vittorio Giovara <vittorio.giovara@gmail.com>
 *
 * 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
 */

/**
 * @file
 * Stereoscopic video
 */

#ifndef AVUTIL_STEREO3D_H
#define AVUTIL_STEREO3D_H

#include <stdint.h>

#include "frame.h"

/**
 * @addtogroup lavu_video
 * @{
 *
 * @defgroup lavu_video_stereo3d Stereo3D types and functions
 * @{
 */

/**
 * @addtogroup lavu_video_stereo3d
 * A stereoscopic video file consists in multiple views embedded in a single
 * frame, usually describing two views of a scene. This file describes all
 * possible codec-independent view arrangements.
 * */

/**
 * List of possible 3D Types
 */
enum AVStereo3DType {
    /**
     * Video is not stereoscopic (and metadata has to be there).
     */
    AV_STEREO3D_2D,

    /**
     * Views are next to each other.
     *
     * @code{.unparsed}
     *    LLLLRRRR
     *    LLLLRRRR
     *    LLLLRRRR
     *    ...
     * @endcode
     */
    AV_STEREO3D_SIDEBYSIDE,

    /**
     * Views are on top of each other.
     *
     * @code{.unparsed}
     *    LLLLLLLL
     *    LLLLLLLL
     *    RRRRRRRR
     *    RRRRRRRR
     * @endcode
     */
    AV_STEREO3D_TOPBOTTOM,

    /**
     * Views are alternated temporally.
     *
     * @code{.unparsed}
     *     frame0   frame1   frame2   ...
     *    LLLLLLLL RRRRRRRR LLLLLLLL
     *    LLLLLLLL RRRRRRRR LLLLLLLL
     *    LLLLLLLL RRRRRRRR LLLLLLLL
     *    ...      ...      ...
     * @endcode
     */
    AV_STEREO3D_FRAMESEQUENCE,

    /**
     * Views are packed in a checkerboard-like structure per pixel.
     *
     * @code{.unparsed}
     *    LRLRLRLR
     *    RLRLRLRL
     *    LRLRLRLR
     *    ...
     * @endcode
     */
    AV_STEREO3D_CHECKERBOARD,

    /**
     * Views are next to each other, but when upscaling
     * apply a checkerboard pattern.
     *
     * @code{.unparsed}
     *     LLLLRRRR          L L L L    R R R R
     *     LLLLRRRR    =>     L L L L  R R R R
     *     LLLLRRRR          L L L L    R R R R
     *     LLLLRRRR           L L L L  R R R R
     * @endcode
     */
    AV_STEREO3D_SIDEBYSIDE_QUINCUNX,

    /**
     * Views are packed per line, as if interlaced.
     *
     * @code{.unparsed}
     *    LLLLLLLL
     *    RRRRRRRR
     *    LLLLLLLL
     *    ...
     * @endcode
     */
    AV_STEREO3D_LINES,

    /**
     * Views are packed per column.
     *
     * @code{.unparsed}
     *    LRLRLRLR
     *    LRLRLRLR
     *    LRLRLRLR
     *    ...
     * @endcode
     */
    AV_STEREO3D_COLUMNS,
};

/**
 * List of possible view types.
 */
enum AVStereo3DView {
    /**
     * Frame contains two packed views.
     */
    AV_STEREO3D_VIEW_PACKED,

    /**
     * Frame contains only the left view.
     */
    AV_STEREO3D_VIEW_LEFT,

    /**
     * Frame contains only the right view.
     */
    AV_STEREO3D_VIEW_RIGHT,
};

/**
 * Inverted views, Right/Bottom represents the left view.
 */
#define AV_STEREO3D_FLAG_INVERT     (1 << 0)

/**
 * Stereo 3D type: this structure describes how two videos are packed
 * within a single video surface, with additional information as needed.
 *
 * @note The struct must be allocated with av_stereo3d_alloc() and
 *       its size is not a part of the public ABI.
 */
typedef struct AVStereo3D {
    /**
     * How views are packed within the video.
     */
    enum AVStereo3DType type;

    /**
     * Additional information about the frame packing.
     */
    int flags;

    /**
     * Determines which views are packed.
     */
    enum AVStereo3DView view;
} AVStereo3D;

/**
 * Allocate an AVStereo3D structure and set its fields to default values.
 * The resulting struct can be freed using av_freep().
 *
 * @return An AVStereo3D filled with default values or NULL on failure.
 */
AVStereo3D *av_stereo3d_alloc(void);

/**
 * Allocate a complete AVFrameSideData and add it to the frame.
 *
 * @param frame The frame which side data is added to.
 *
 * @return The AVStereo3D structure to be filled by caller.
 */
AVStereo3D *av_stereo3d_create_side_data(AVFrame *frame);

/**
 * Provide a human-readable name of a given stereo3d type.
 *
 * @param type The input stereo3d type value.
 *
 * @return The name of the stereo3d value, or "unknown".
 */
const char *av_stereo3d_type_name(unsigned int type);

/**
 * Get the AVStereo3DType form a human-readable name.
 *
 * @param name The input string.
 *
 * @return The AVStereo3DType value, or -1 if not found.
 */
int av_stereo3d_from_name(const char *name);

/**
 * @}
 * @}
 */

#endif /* AVUTIL_STEREO3D_H */