libavcodec/motionpixels_tablegen.h

   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 Libav.
   7  *
   8  * Libav 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  * Libav 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 Libav; 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
  28 typedef struct YuvPixel {
  29     int8_t y, v, u;
  30 } YuvPixel;
  31
  32 static int mp_yuv_to_rgb(int y, int v, int u, int clip_rgb) {
  33     static const uint8_t *cm = ff_cropTbl + MAX_NEG_CROP;
  34     int r, g, b;
  35
  36     r = (1000 * y + 701 * v) / 1000;
  37     g = (1000 * y - 357 * v - 172 * u) / 1000;
  38     b = (1000 * y + 886 * u) / 1000;
  39     if (clip_rgb)
  40         return ((cm[r * 8] & 0xF8) << 7) | ((cm[g * 8] & 0xF8) << 2) | (cm[b * 8] >> 3);
  41     if ((unsigned)r < 32 && (unsigned)g < 32 && (unsigned)b < 32)
  42         return (r << 10) | (g << 5) | b;
  43     return 1 << 15;
  44 }
  45
  46 #if CONFIG_HARDCODED_TABLES
  47 #define motionpixels_tableinit()
  48 #include "libavcodec/motionpixels_tables.h"
  49 #else
  50 static YuvPixel mp_rgb_yuv_table[1 << 15];
  51
  52 static void mp_set_zero_yuv(YuvPixel *p)
  53 {
  54     int i, j;
  55
  56     for (i = 0; i < 31; ++i) {
  57         for (j = 31; j > i; --j)
  58             if (!(p[j].u | p[j].v | p[j].y))
  59                 p[j] = p[j - 1];
  60         for (j = 0; j < 31 - i; ++j)
  61             if (!(p[j].u | p[j].v | p[j].y))
  62                 p[j] = p[j + 1];
  63     }
  64 }
  65
  66 static void mp_build_rgb_yuv_table(YuvPixel *p)
  67 {
  68     int y, v, u, i;
  69
  70     for (y = 0; y <= 31; ++y)
  71         for (v = -31; v <= 31; ++v)
  72             for (u = -31; u <= 31; ++u) {
  73                 i = mp_yuv_to_rgb(y, v, u, 0);
  74                 if (i < (1 << 15) && !(p[i].u | p[i].v | p[i].y)) {
  75                     p[i].y = y;
  76                     p[i].v = v;
  77                     p[i].u = u;
  78                 }
  79             }
  80     for (i = 0; i < 1024; ++i)
  81         mp_set_zero_yuv(p + i * 32);
  82 }
  83
  84 static void motionpixels_tableinit(void)
  85 {
  86     if (!mp_rgb_yuv_table[0].u)
  87         mp_build_rgb_yuv_table(mp_rgb_yuv_table);
  88 }
  89 #endif /* CONFIG_HARDCODED_TABLES */
  90
  91 #endif /* AVCODEC_MOTIONPIXELS_TABLEGEN_H */