repositories / deb_ffmpeg.git / blame
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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 */ |