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  1. /*
  2.  * Header file for hardcoded motionpixels RGB to YUV table
  3.  *
  4.  * Copyright (c) 2009 Reimar Döffinger <Reimar.Doeffinger@gmx.de>
  5.  *
  6.  * This file is part of FFmpeg.
  7.  *
  8.  * FFmpeg is free software; you can redistribute it and/or
  9.  * modify it under the terms of the GNU Lesser General Public
  10.  * License as published by the Free Software Foundation; either
  11.  * version 2.1 of the License, or (at your option) any later version.
  12.  *
  13.  * FFmpeg is distributed in the hope that it will be useful,
  14.  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15.  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  16.  * Lesser General Public License for more details.
  17.  *
  18.  * You should have received a copy of the GNU Lesser General Public
  19.  * License along with FFmpeg; if not, write to the Free Software
  20.  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  21.  */
  22.  
  23. #ifndef AVCODEC_MOTIONPIXELS_TABLEGEN_H
  24. #define AVCODEC_MOTIONPIXELS_TABLEGEN_H
  25.  
  26. #include <stdint.h>
  27. #include "libavutil/attributes.h"
  28.  
  29. typedef struct YuvPixel {
  30.     int8_t y, v, u;
  31. } YuvPixel;
  32.  
  33. static int mp_yuv_to_rgb(int y, int v, int u, int clip_rgb) {
  34.     const uint8_t *cm = ff_crop_tab + MAX_NEG_CROP;
  35.     int r, g, b;
  36.  
  37.     r = (1000 * y + 701 * v) / 1000;
  38.     g = (1000 * y - 357 * v - 172 * u) / 1000;
  39.     b = (1000 * y + 886 * u) / 1000;
  40.     if (clip_rgb)
  41.         return ((cm[r * 8] & 0xF8) << 7) | ((cm[g * 8] & 0xF8) << 2) | (cm[b * 8] >> 3);
  42.     if ((unsigned)r < 32 && (unsigned)g < 32 && (unsigned)b < 32)
  43.         return (r << 10) | (g << 5) | b;
  44.     return 1 << 15;
  45. }
  46.  
  47. #if CONFIG_HARDCODED_TABLES
  48. #define motionpixels_tableinit()
  49. #include "libavcodec/motionpixels_tables.h"
  50. #else
  51. static YuvPixel mp_rgb_yuv_table[1 << 15];
  52.  
  53. static av_cold void mp_set_zero_yuv(YuvPixel *p)
  54. {
  55.     int i, j;
  56.  
  57.     for (i = 0; i < 31; ++i) {
  58.         for (j = 31; j > i; --j)
  59.             if (!(p[j].u | p[j].v | p[j].y))
  60.                 p[j] = p[j - 1];
  61.         for (j = 0; j < 31 - i; ++j)
  62.             if (!(p[j].u | p[j].v | p[j].y))
  63.                 p[j] = p[j + 1];
  64.     }
  65. }
  66.  
  67. static av_cold void mp_build_rgb_yuv_table(YuvPixel *p)
  68. {
  69.     int y, v, u, i;
  70.  
  71.     for (y = 0; y <= 31; ++y)
  72.         for (v = -31; v <= 31; ++v)
  73.             for (u = -31; u <= 31; ++u) {
  74.                 i = mp_yuv_to_rgb(y, v, u, 0);
  75.                 if (i < (1 << 15) && !(p[i].u | p[i].v | p[i].y)) {
  76.                     p[i].y = y;
  77.                     p[i].v = v;
  78.                     p[i].u = u;
  79.                 }
  80.             }
  81.     for (i = 0; i < 1024; ++i)
  82.         mp_set_zero_yuv(p + i * 32);
  83. }
  84.  
  85. static av_cold void motionpixels_tableinit(void)
  86. {
  87.     if (!mp_rgb_yuv_table[0].u)
  88.         mp_build_rgb_yuv_table(mp_rgb_yuv_table);
  89. }
  90. #endif /* CONFIG_HARDCODED_TABLES */
  91.  
  92. #endif /* AVCODEC_MOTIONPIXELS_TABLEGEN_H */
  93.