text: /*
   * Copyright (c) 2016 Ronald S. Bultje <rsbultje@gmail.com>
   *
   * 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_COLORSPACEDSP_H
  #define AVFILTER_COLORSPACEDSP_H
  
  #include <stddef.h>
  #include <stdint.h>
  
  typedef void (*yuv2rgb_fn)(int16_t *rgb[3], ptrdiff_t rgb_stride,
                             uint8_t *yuv[3], const ptrdiff_t yuv_stride[3],
                             int w, int h, const int16_t yuv2rgb_coeffs[3][3][8],
                             const int16_t yuv_offset[8]);
  typedef void (*rgb2yuv_fn)(uint8_t *yuv[3], const ptrdiff_t yuv_stride[3],
                             int16_t *rgb[3], ptrdiff_t rgb_stride,
                             int w, int h, const int16_t rgb2yuv_coeffs[3][3][8],
                             const int16_t yuv_offset[8]);
  typedef void (*rgb2yuv_fsb_fn)(uint8_t *yuv[3], const ptrdiff_t yuv_stride[3],
                                 int16_t *rgb[3], ptrdiff_t rgb_stride,
                                 int w, int h, const int16_t rgb2yuv_coeffs[3][3][8],
                                 const int16_t yuv_offset[8],
                                 int *rnd[3][2]);
  typedef void (*yuv2yuv_fn)(uint8_t *yuv_out[3], const ptrdiff_t yuv_out_stride[3],
                             uint8_t *yuv_in[3], const ptrdiff_t yuv_in_stride[3],
                             int w, int h, const int16_t yuv2yuv_coeffs[3][3][8],
                             const int16_t yuv_offset[2][8]);
  
  enum BitDepthIndex {
      BPP_8,
      BPP_10,
      BPP_12,
      NB_BPP,
  };
  
  enum ChromaSubsamplingIndex {
      SS_444,
      SS_422,
      SS_420,
      NB_SS,
  };
  
  typedef struct ColorSpaceDSPContext {
      /* Convert input YUV pixel buffer from a user into an internal, 15bpp array
       * of intermediate RGB data. */
      yuv2rgb_fn yuv2rgb[NB_BPP][NB_SS];
      /* Convert intermediate RGB data (15bpp, internal format) into YUV data and
       * store into user-provided output buffer */
      rgb2yuv_fn rgb2yuv[NB_BPP][NB_SS];
      /* Same as rgb2yuv(), but use floyd-steinberg dithering */
      rgb2yuv_fsb_fn rgb2yuv_fsb[NB_BPP][NB_SS];
      /* Direct yuv-to-yuv conversion (input and output are both user-provided
       * buffers) */
      yuv2yuv_fn yuv2yuv[NB_BPP /* in */][NB_BPP /* out */][NB_SS];
  
      /* In-place 3x3 matrix multiplication. Input and output are both 15bpp
       * (our internal data format) */
      void (*multiply3x3)(int16_t *data[3], ptrdiff_t stride,
                          int w, int h, const int16_t m[3][3][8]);
  } ColorSpaceDSPContext;
  
  void ff_colorspacedsp_init(ColorSpaceDSPContext *dsp);
  
  /* internal */
  void ff_colorspacedsp_x86_init(ColorSpaceDSPContext *dsp);
  
  #endif /* AVFILTER_COLORSPACEDSP_H */
  