yading@10: /* yading@10: * Copyright (C) 2010 Georg Martius yading@10: * Copyright (C) 2010 Daniel G. Taylor yading@10: * yading@10: * This file is part of FFmpeg. yading@10: * yading@10: * FFmpeg is free software; you can redistribute it and/or yading@10: * modify it under the terms of the GNU Lesser General Public yading@10: * License as published by the Free Software Foundation; either yading@10: * version 2.1 of the License, or (at your option) any later version. yading@10: * yading@10: * FFmpeg is distributed in the hope that it will be useful, yading@10: * but WITHOUT ANY WARRANTY; without even the implied warranty of yading@10: * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU yading@10: * Lesser General Public License for more details. yading@10: * yading@10: * You should have received a copy of the GNU Lesser General Public yading@10: * License along with FFmpeg; if not, write to the Free Software yading@10: * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA yading@10: */ yading@10: yading@10: #ifndef AVFILTER_TRANSFORM_H yading@10: #define AVFILTER_TRANSFORM_H yading@10: yading@10: #include yading@10: yading@10: /** yading@10: * @file yading@10: * transform input video yading@10: * yading@10: * All matrices are defined as a single 9-item block of contiguous memory. For yading@10: * example, the identity matrix would be: yading@10: * yading@10: * float *matrix = {1, 0, 0, yading@10: * 0, 1, 0, yading@10: * 0, 0, 1}; yading@10: */ yading@10: yading@10: enum InterpolateMethod { yading@10: INTERPOLATE_NEAREST, //< Nearest-neighbor (fast) yading@10: INTERPOLATE_BILINEAR, //< Bilinear yading@10: INTERPOLATE_BIQUADRATIC, //< Biquadratic (best) yading@10: INTERPOLATE_COUNT, //< Number of interpolation methods yading@10: }; yading@10: yading@10: // Shortcuts for the fastest and best interpolation methods yading@10: #define INTERPOLATE_DEFAULT INTERPOLATE_BILINEAR yading@10: #define INTERPOLATE_FAST INTERPOLATE_NEAREST yading@10: #define INTERPOLATE_BEST INTERPOLATE_BIQUADRATIC yading@10: yading@10: enum FillMethod { yading@10: FILL_BLANK, //< Fill zeroes at blank locations yading@10: FILL_ORIGINAL, //< Original image at blank locations yading@10: FILL_CLAMP, //< Extruded edge value at blank locations yading@10: FILL_MIRROR, //< Mirrored edge at blank locations yading@10: FILL_COUNT, //< Number of edge fill methods yading@10: }; yading@10: yading@10: // Shortcuts for fill methods yading@10: #define FILL_DEFAULT FILL_ORIGINAL yading@10: yading@10: /** yading@10: * Get an affine transformation matrix from a given translation, rotation, and yading@10: * zoom factor. The matrix will look like: yading@10: * yading@10: * [ zoom * cos(angle), -sin(angle), x_shift, yading@10: * sin(angle), zoom * cos(angle), y_shift, yading@10: * 0, 0, 1 ] yading@10: * yading@10: * @param x_shift horizontal translation yading@10: * @param y_shift vertical translation yading@10: * @param angle rotation in radians yading@10: * @param zoom scale percent (1.0 = 100%) yading@10: * @param matrix 9-item affine transformation matrix yading@10: */ yading@10: void avfilter_get_matrix(float x_shift, float y_shift, float angle, float zoom, float *matrix); yading@10: yading@10: /** yading@10: * Add two matrices together. result = m1 + m2. yading@10: * yading@10: * @param m1 9-item transformation matrix yading@10: * @param m2 9-item transformation matrix yading@10: * @param result 9-item transformation matrix yading@10: */ yading@10: void avfilter_add_matrix(const float *m1, const float *m2, float *result); yading@10: yading@10: /** yading@10: * Subtract one matrix from another. result = m1 - m2. yading@10: * yading@10: * @param m1 9-item transformation matrix yading@10: * @param m2 9-item transformation matrix yading@10: * @param result 9-item transformation matrix yading@10: */ yading@10: void avfilter_sub_matrix(const float *m1, const float *m2, float *result); yading@10: yading@10: /** yading@10: * Multiply a matrix by a scalar value. result = m1 * scalar. yading@10: * yading@10: * @param m1 9-item transformation matrix yading@10: * @param scalar a number yading@10: * @param result 9-item transformation matrix yading@10: */ yading@10: void avfilter_mul_matrix(const float *m1, float scalar, float *result); yading@10: yading@10: /** yading@10: * Do an affine transformation with the given interpolation method. This yading@10: * multiplies each vector [x,y,1] by the matrix and then interpolates to yading@10: * get the final value. yading@10: * yading@10: * @param src source image yading@10: * @param dst destination image yading@10: * @param src_stride source image line size in bytes yading@10: * @param dst_stride destination image line size in bytes yading@10: * @param width image width in pixels yading@10: * @param height image height in pixels yading@10: * @param matrix 9-item affine transformation matrix yading@10: * @param interpolate pixel interpolation method yading@10: * @param fill edge fill method yading@10: * @return negative on error yading@10: */ yading@10: int avfilter_transform(const uint8_t *src, uint8_t *dst, yading@10: int src_stride, int dst_stride, yading@10: int width, int height, const float *matrix, yading@10: enum InterpolateMethod interpolate, yading@10: enum FillMethod fill); yading@10: yading@10: #endif /* AVFILTER_TRANSFORM_H */