2 * Copyright (C) 2010 Georg Martius <georg.martius@web.de>
3 * Copyright (C) 2010 Daniel G. Taylor <dan@programmer-art.org>
5 * This file is part of FFmpeg.
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.
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.
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
22 #ifndef AVFILTER_TRANSFORM_H
23 #define AVFILTER_TRANSFORM_H
29 * transform input video
31 * All matrices are defined as a single 9-item block of contiguous memory. For
32 * example, the identity matrix would be:
34 * float *matrix = {1, 0, 0,
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
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
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
59 // Shortcuts for fill methods
60 #define FILL_DEFAULT FILL_ORIGINAL
63 * Get an affine transformation matrix from given translation, rotation, and
64 * zoom factors. The matrix will look like:
66 * [ scale_x * cos(angle), -sin(angle), x_shift,
67 * sin(angle), scale_y * cos(angle), y_shift,
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
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.
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
102 int ff_affine_transform(const uint8_t *src, uint8_t *dst,
103 int src_stride, int dst_stride,
104 int width, int height, const float *matrix,
105 enum InterpolateMethod interpolate,
106 enum FillMethod fill);
108 #endif /* AVFILTER_TRANSFORM_H */