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
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
57 };
58
59 // Shortcuts for fill methods
60 #define FILL_DEFAULT FILL_ORIGINAL
61
62 /**
63 * Get an affine transformation matrix from given translation, rotation, and
64 * zoom factors. The matrix will look like:
65 *
66 * [ scale_x * cos(angle), -sin(angle), x_shift,
67 * sin(angle), scale_y * 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 scale_x x scale percent (1.0 = 100%)
74 * @param scale_y y scale percent (1.0 = 100%)
75 * @param matrix 9-item affine transformation matrix
76 */
78 float x_shift,
79 float y_shift,
80 float angle,
81 float scale_x,
82 float scale_y,
83 float *matrix
84 );
85
86 /**
87 * Do an affine transformation with the given interpolation method. This
88 * multiplies each vector [x,y,1] by the matrix and then interpolates to
89 * get the final value.
90 *
91 * @param src source image
92 * @param dst destination image
93 * @param src_stride source image line size in bytes
94 * @param dst_stride destination image line size in bytes
95 * @param width image width in pixels
96 * @param height image height in pixels
97 * @param matrix 9-item affine transformation matrix
98 * @param interpolate pixel interpolation method
99 * @param fill edge fill method
100 * @return negative on error
101 */
103 int src_stride, int dst_stride,
107
108 #endif /* AVFILTER_TRANSFORM_H */