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1 | /* |
2 | * Copyright (C) 2010 Georg Martius <georg.martius@web.de> |
3 | * Copyright (C) 2010 Daniel G. Taylor <dan@programmer-art.org> |
4 | * |
5 | * This file is part of FFmpeg. |
6 | * |
7 | * FFmpeg is free software; you can redistribute it and/or |
8 | * modify it under the terms of the GNU Lesser General Public |
9 | * License as published by the Free Software Foundation; either |
10 | * version 2.1 of the License, or (at your option) any later version. |
11 | * |
12 | * FFmpeg is distributed in the hope that it will be useful, |
13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
15 | * Lesser General Public License for more details. |
16 | * |
17 | * You should have received a copy of the GNU Lesser General Public |
18 | * License along with FFmpeg; if not, write to the Free Software |
19 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
20 | */ |
21 | |
22 | #ifndef AVFILTER_TRANSFORM_H |
23 | #define AVFILTER_TRANSFORM_H |
24 | |
25 | #include <stdint.h> |
26 | |
27 | /** |
28 | * @file |
29 | * transform input video |
30 | * |
31 | * All matrices are defined as a single 9-item block of contiguous memory. For |
32 | * example, the identity matrix would be: |
33 | * |
34 | * float *matrix = {1, 0, 0, |
35 | * 0, 1, 0, |
36 | * 0, 0, 1}; |
37 | */ |
38 | |
39 | enum InterpolateMethod { |
40 | INTERPOLATE_NEAREST, //< Nearest-neighbor (fast) |
41 | INTERPOLATE_BILINEAR, //< Bilinear |
42 | INTERPOLATE_BIQUADRATIC, //< Biquadratic (best) |
43 | INTERPOLATE_COUNT, //< Number of interpolation methods |
44 | }; |
45 | |
46 | // Shortcuts for the fastest and best interpolation methods |
47 | #define INTERPOLATE_DEFAULT INTERPOLATE_BILINEAR |
48 | #define INTERPOLATE_FAST INTERPOLATE_NEAREST |
49 | #define INTERPOLATE_BEST INTERPOLATE_BIQUADRATIC |
50 | |
51 | enum FillMethod { |
52 | FILL_BLANK, //< Fill zeroes at blank locations |
53 | FILL_ORIGINAL, //< Original image at blank locations |
54 | FILL_CLAMP, //< Extruded edge value at blank locations |
55 | FILL_MIRROR, //< Mirrored edge at blank locations |
56 | FILL_COUNT, //< Number of edge fill methods |
57 | }; |
58 | |
59 | // Shortcuts for fill methods |
60 | #define FILL_DEFAULT FILL_ORIGINAL |
61 | |
62 | /** |
63 | * Get an affine transformation matrix from a given translation, rotation, and |
64 | * zoom factor. The matrix will look like: |
65 | * |
66 | * [ zoom * cos(angle), -sin(angle), x_shift, |
67 | * sin(angle), zoom * cos(angle), y_shift, |
68 | * 0, 0, 1 ] |
69 | * |
70 | * @param x_shift horizontal translation |
71 | * @param y_shift vertical translation |
72 | * @param angle rotation in radians |
73 | * @param zoom scale percent (1.0 = 100%) |
74 | * @param matrix 9-item affine transformation matrix |
75 | */ |
76 | void avfilter_get_matrix(float x_shift, float y_shift, float angle, float zoom, float *matrix); |
77 | |
78 | /** |
79 | * Add two matrices together. result = m1 + m2. |
80 | * |
81 | * @param m1 9-item transformation matrix |
82 | * @param m2 9-item transformation matrix |
83 | * @param result 9-item transformation matrix |
84 | */ |
85 | void avfilter_add_matrix(const float *m1, const float *m2, float *result); |
86 | |
87 | /** |
88 | * Subtract one matrix from another. result = m1 - m2. |
89 | * |
90 | * @param m1 9-item transformation matrix |
91 | * @param m2 9-item transformation matrix |
92 | * @param result 9-item transformation matrix |
93 | */ |
94 | void avfilter_sub_matrix(const float *m1, const float *m2, float *result); |
95 | |
96 | /** |
97 | * Multiply a matrix by a scalar value. result = m1 * scalar. |
98 | * |
99 | * @param m1 9-item transformation matrix |
100 | * @param scalar a number |
101 | * @param result 9-item transformation matrix |
102 | */ |
103 | void avfilter_mul_matrix(const float *m1, float scalar, float *result); |
104 | |
105 | /** |
106 | * Do an affine transformation with the given interpolation method. This |
107 | * multiplies each vector [x,y,1] by the matrix and then interpolates to |
108 | * get the final value. |
109 | * |
110 | * @param src source image |
111 | * @param dst destination image |
112 | * @param src_stride source image line size in bytes |
113 | * @param dst_stride destination image line size in bytes |
114 | * @param width image width in pixels |
115 | * @param height image height in pixels |
116 | * @param matrix 9-item affine transformation matrix |
117 | * @param interpolate pixel interpolation method |
118 | * @param fill edge fill method |
119 | * @return negative on error |
120 | */ |
121 | int avfilter_transform(const uint8_t *src, uint8_t *dst, |
122 | int src_stride, int dst_stride, |
123 | int width, int height, const float *matrix, |
124 | enum InterpolateMethod interpolate, |
125 | enum FillMethod fill); |
126 | |
127 | #endif /* AVFILTER_TRANSFORM_H */ |
128 |