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108 lines
3.7 KiB
108 lines
3.7 KiB
/* |
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* Copyright (C) 2010 Georg Martius <georg.martius@web.de> |
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* Copyright (C) 2010 Daniel G. Taylor <dan@programmer-art.org> |
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* |
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* This file is part of FFmpeg. |
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* |
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* FFmpeg is free software; you can redistribute it and/or |
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* modify it under the terms of the GNU Lesser General Public |
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* License as published by the Free Software Foundation; either |
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* version 2.1 of the License, or (at your option) any later version. |
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* |
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* FFmpeg is distributed in the hope that it will be useful, |
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* but WITHOUT ANY WARRANTY; without even the implied warranty of |
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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* Lesser General Public License for more details. |
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* |
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* You should have received a copy of the GNU Lesser General Public |
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* License along with FFmpeg; if not, write to the Free Software |
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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*/ |
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#ifndef AVFILTER_TRANSFORM_H |
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#define AVFILTER_TRANSFORM_H |
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#include <stdint.h> |
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/** |
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* @file |
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* transform input video |
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* |
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* All matrices are defined as a single 9-item block of contiguous memory. For |
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* example, the identity matrix would be: |
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* |
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* float *matrix = {1, 0, 0, |
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* 0, 1, 0, |
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* 0, 0, 1}; |
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*/ |
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enum InterpolateMethod { |
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INTERPOLATE_NEAREST, //< Nearest-neighbor (fast) |
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INTERPOLATE_BILINEAR, //< Bilinear |
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INTERPOLATE_BIQUADRATIC, //< Biquadratic (best) |
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INTERPOLATE_COUNT, //< Number of interpolation methods |
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}; |
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// Shortcuts for the fastest and best interpolation methods |
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#define INTERPOLATE_DEFAULT INTERPOLATE_BILINEAR |
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#define INTERPOLATE_FAST INTERPOLATE_NEAREST |
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#define INTERPOLATE_BEST INTERPOLATE_BIQUADRATIC |
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enum FillMethod { |
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FILL_BLANK, //< Fill zeroes at blank locations |
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FILL_ORIGINAL, //< Original image at blank locations |
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FILL_CLAMP, //< Extruded edge value at blank locations |
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FILL_MIRROR, //< Mirrored edge at blank locations |
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FILL_COUNT, //< Number of edge fill methods |
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}; |
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// Shortcuts for fill methods |
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#define FILL_DEFAULT FILL_ORIGINAL |
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/** |
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* Get an affine transformation matrix from given translation, rotation, and |
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* zoom factors. The matrix will look like: |
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* |
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* [ scale_x * cos(angle), -sin(angle), x_shift, |
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* sin(angle), scale_y * cos(angle), y_shift, |
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* 0, 0, 1 ] |
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* |
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* @param x_shift horizontal translation |
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* @param y_shift vertical translation |
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* @param angle rotation in radians |
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* @param scale_x x scale percent (1.0 = 100%) |
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* @param scale_y y scale percent (1.0 = 100%) |
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* @param matrix 9-item affine transformation matrix |
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*/ |
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void ff_get_matrix( |
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float x_shift, |
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float y_shift, |
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float angle, |
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float scale_x, |
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float scale_y, |
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float *matrix |
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); |
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/** |
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* Do an affine transformation with the given interpolation method. This |
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* multiplies each vector [x,y,1] by the matrix and then interpolates to |
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* get the final value. |
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* |
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* @param src source image |
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* @param dst destination image |
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* @param src_stride source image line size in bytes |
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* @param dst_stride destination image line size in bytes |
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* @param width image width in pixels |
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* @param height image height in pixels |
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* @param matrix 9-item affine transformation matrix |
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* @param interpolate pixel interpolation method |
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* @param fill edge fill method |
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* @return negative on error |
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*/ |
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int ff_affine_transform(const uint8_t *src, uint8_t *dst, |
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int src_stride, int dst_stride, |
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int width, int height, const float *matrix, |
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enum InterpolateMethod interpolate, |
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enum FillMethod fill); |
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#endif /* AVFILTER_TRANSFORM_H */
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