/* * Copyright (C) 2010 Georg Martius <georg.martius@web.de> * Copyright (C) 2010 Daniel G. Taylor <dan@programmer-art.org> * * This file is part of FFmpeg. * * FFmpeg is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2.1 of the License, or (at your option) any later version. * * FFmpeg is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with FFmpeg; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ #ifndef AVFILTER_TRANSFORM_H #define AVFILTER_TRANSFORM_H #include <stdint.h> /** * @file * transform input video * * All matrices are defined as a single 9-item block of contiguous memory. For * example, the identity matrix would be: * * float *matrix = {1, 0, 0, * 0, 1, 0, * 0, 0, 1}; */ enum InterpolateMethod { INTERPOLATE_NEAREST, //< Nearest-neighbor (fast) INTERPOLATE_BILINEAR, //< Bilinear INTERPOLATE_BIQUADRATIC, //< Biquadratic (best) INTERPOLATE_COUNT, //< Number of interpolation methods }; // Shortcuts for the fastest and best interpolation methods #define INTERPOLATE_DEFAULT INTERPOLATE_BILINEAR #define INTERPOLATE_FAST INTERPOLATE_NEAREST #define INTERPOLATE_BEST INTERPOLATE_BIQUADRATIC enum FillMethod { FILL_BLANK, //< Fill zeroes at blank locations FILL_ORIGINAL, //< Original image at blank locations FILL_CLAMP, //< Extruded edge value at blank locations FILL_MIRROR, //< Mirrored edge at blank locations FILL_COUNT, //< Number of edge fill methods }; // Shortcuts for fill methods #define FILL_DEFAULT FILL_ORIGINAL /** * Get an affine transformation matrix from a given translation, rotation, and * zoom factor. The matrix will look like: * * [ zoom * cos(angle), -sin(angle), x_shift, * sin(angle), zoom * cos(angle), y_shift, * 0, 0, 1 ] * * @param x_shift horizontal translation * @param y_shift vertical translation * @param angle rotation in radians * @param zoom scale percent (1.0 = 100%) * @param matrix 9-item affine transformation matrix */ void avfilter_get_matrix(float x_shift, float y_shift, float angle, float zoom, float *matrix); /** * Add two matrices together. result = m1 + m2. * * @param m1 9-item transformation matrix * @param m2 9-item transformation matrix * @param result 9-item transformation matrix */ void avfilter_add_matrix(const float *m1, const float *m2, float *result); /** * Subtract one matrix from another. result = m1 - m2. * * @param m1 9-item transformation matrix * @param m2 9-item transformation matrix * @param result 9-item transformation matrix */ void avfilter_sub_matrix(const float *m1, const float *m2, float *result); /** * Multiply a matrix by a scalar value. result = m1 * scalar. * * @param m1 9-item transformation matrix * @param scalar a number * @param result 9-item transformation matrix */ void avfilter_mul_matrix(const float *m1, float scalar, float *result); /** * Do an affine transformation with the given interpolation method. This * multiplies each vector [x,y,1] by the matrix and then interpolates to * get the final value. * * @param src source image * @param dst destination image * @param src_stride source image line size in bytes * @param dst_stride destination image line size in bytes * @param width image width in pixels * @param height image height in pixels * @param matrix 9-item affine transformation matrix * @param interpolate pixel interpolation method * @param fill edge fill method * @return negative on error */ int avfilter_transform(const uint8_t *src, uint8_t *dst, int src_stride, int dst_stride, int width, int height, const float *matrix, enum InterpolateMethod interpolate, enum FillMethod fill); #endif /* AVFILTER_TRANSFORM_H */