| /* |
| * 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 */ |