libavcodec/motionpixels_tablegen.h

   1 /*
   2  * Header file for hardcoded motion pixels 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     mp_build_rgb_yuv_table(mp_rgb_yuv_table);
  88 }
  89 #endif /* CONFIG_HARDCODED_TABLES */
  90
  91 #endif /* AVCODEC_MOTIONPIXELS_TABLEGEN_H */