/* * 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 /** * @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 */void 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 */