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  1. /*
  2.  * Copyright (C) 2010 Georg Martius <georg.martius@web.de>
  3.  * Copyright (C) 2010 Daniel G. Taylor <dan@programmer-art.org>
  4.  *
  5.  * This file is part of FFmpeg.
  6.  *
  7.  * FFmpeg is free software; you can redistribute it and/or
  8.  * modify it under the terms of the GNU Lesser General Public
  9.  * License as published by the Free Software Foundation; either
  10.  * version 2.1 of the License, or (at your option) any later version.
  11.  *
  12.  * FFmpeg is distributed in the hope that it will be useful,
  13.  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14.  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15.  * Lesser General Public License for more details.
  16.  *
  17.  * You should have received a copy of the GNU Lesser General Public
  18.  * License along with FFmpeg; if not, write to the Free Software
  19.  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  20.  */
  21.  
  22. #ifndef AVFILTER_TRANSFORM_H
  23. #define AVFILTER_TRANSFORM_H
  24.  
  25. #include <stdint.h>
  26.  
  27. /**
  28.  * @file
  29.  * transform input video
  30.  *
  31.  * All matrices are defined as a single 9-item block of contiguous memory. For
  32.  * example, the identity matrix would be:
  33.  *
  34.  *     float *matrix = {1, 0, 0,
  35.  *                      0, 1, 0,
  36.  *                      0, 0, 1};
  37.  */
  38.  
  39. enum InterpolateMethod {
  40.     INTERPOLATE_NEAREST,        //< Nearest-neighbor (fast)
  41.     INTERPOLATE_BILINEAR,       //< Bilinear
  42.     INTERPOLATE_BIQUADRATIC,    //< Biquadratic (best)
  43.     INTERPOLATE_COUNT,          //< Number of interpolation methods
  44. };
  45.  
  46. // Shortcuts for the fastest and best interpolation methods
  47. #define INTERPOLATE_DEFAULT INTERPOLATE_BILINEAR
  48. #define INTERPOLATE_FAST    INTERPOLATE_NEAREST
  49. #define INTERPOLATE_BEST    INTERPOLATE_BIQUADRATIC
  50.  
  51. enum FillMethod {
  52.     FILL_BLANK,         //< Fill zeroes at blank locations
  53.     FILL_ORIGINAL,      //< Original image at blank locations
  54.     FILL_CLAMP,         //< Extruded edge value at blank locations
  55.     FILL_MIRROR,        //< Mirrored edge at blank locations
  56.     FILL_COUNT,         //< Number of edge fill methods
  57. };
  58.  
  59. // Shortcuts for fill methods
  60. #define FILL_DEFAULT FILL_ORIGINAL
  61.  
  62. /**
  63.  * Get an affine transformation matrix from a given translation, rotation, and
  64.  * zoom factor. The matrix will look like:
  65.  *
  66.  * [ zoom * cos(angle),           -sin(angle),     x_shift,
  67.  *          sin(angle),     zoom * cos(angle),     y_shift,
  68.  *                   0,                     0,           1 ]
  69.  *
  70.  * @param x_shift horizontal translation
  71.  * @param y_shift vertical translation
  72.  * @param angle   rotation in radians
  73.  * @param zoom    scale percent (1.0 = 100%)
  74.  * @param matrix  9-item affine transformation matrix
  75.  */
  76. void avfilter_get_matrix(float x_shift, float y_shift, float angle, float zoom, float *matrix);
  77.  
  78. /**
  79.  * Add two matrices together. result = m1 + m2.
  80.  *
  81.  * @param m1     9-item transformation matrix
  82.  * @param m2     9-item transformation matrix
  83.  * @param result 9-item transformation matrix
  84.  */
  85. void avfilter_add_matrix(const float *m1, const float *m2, float *result);
  86.  
  87. /**
  88.  * Subtract one matrix from another. result = m1 - m2.
  89.  *
  90.  * @param m1     9-item transformation matrix
  91.  * @param m2     9-item transformation matrix
  92.  * @param result 9-item transformation matrix
  93.  */
  94. void avfilter_sub_matrix(const float *m1, const float *m2, float *result);
  95.  
  96. /**
  97.  * Multiply a matrix by a scalar value. result = m1 * scalar.
  98.  *
  99.  * @param m1     9-item transformation matrix
  100.  * @param scalar a number
  101.  * @param result 9-item transformation matrix
  102.  */
  103. void avfilter_mul_matrix(const float *m1, float scalar, float *result);
  104.  
  105. /**
  106.  * Do an affine transformation with the given interpolation method. This
  107.  * multiplies each vector [x,y,1] by the matrix and then interpolates to
  108.  * get the final value.
  109.  *
  110.  * @param src         source image
  111.  * @param dst         destination image
  112.  * @param src_stride  source image line size in bytes
  113.  * @param dst_stride  destination image line size in bytes
  114.  * @param width       image width in pixels
  115.  * @param height      image height in pixels
  116.  * @param matrix      9-item affine transformation matrix
  117.  * @param interpolate pixel interpolation method
  118.  * @param fill        edge fill method
  119.  * @return negative on error
  120.  */
  121. int avfilter_transform(const uint8_t *src, uint8_t *dst,
  122.                         int src_stride, int dst_stride,
  123.                         int width, int height, const float *matrix,
  124.                         enum InterpolateMethod interpolate,
  125.                         enum FillMethod fill);
  126.  
  127. #endif /* AVFILTER_TRANSFORM_H */
  128.