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  1. /*
  2.  * Copyright (c) 2006 Aurelien Jacobs <aurel@gnuage.org>
  3.  * Copyright (c) 2010 Mans Rullgard <mans@mansr.com>
  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. #include <stdint.h>
  23.  
  24. #include "libavutil/attributes.h"
  25. #include "avcodec.h"
  26. #include "vp56dsp.h"
  27. #include "libavutil/common.h"
  28.  
  29. /* Gives very similar result than the vp6 version except in a few cases */
  30. static int vp5_adjust(int v, int t)
  31. {
  32.     int s2, s1 = v >> 31;
  33.     v ^= s1;
  34.     v -= s1;
  35.     v *= v < 2*t;
  36.     v -= t;
  37.     s2 = v >> 31;
  38.     v ^= s2;
  39.     v -= s2;
  40.     v = t - v;
  41.     v += s1;
  42.     v ^= s1;
  43.     return v;
  44. }
  45.  
  46. static int vp6_adjust(int v, int t)
  47. {
  48.     int V = v, s = v >> 31;
  49.     V ^= s;
  50.     V -= s;
  51.     if (V-t-1 >= (unsigned)(t-1))
  52.         return v;
  53.     V = 2*t - V;
  54.     V += s;
  55.     V ^= s;
  56.     return V;
  57. }
  58.  
  59.  
  60. #define VP56_EDGE_FILTER(pfx, suf, pix_inc, line_inc)                   \
  61. static void pfx##_edge_filter_##suf(uint8_t *yuv, int stride, int t)    \
  62. {                                                                       \
  63.     int pix2_inc = 2 * pix_inc;                                         \
  64.     int i, v;                                                           \
  65.                                                                         \
  66.     for (i=0; i<12; i++) {                                              \
  67.         v = (yuv[-pix2_inc] + 3*(yuv[0]-yuv[-pix_inc]) - yuv[pix_inc] + 4)>>3;\
  68.         v = pfx##_adjust(v, t);                                         \
  69.         yuv[-pix_inc] = av_clip_uint8(yuv[-pix_inc] + v);               \
  70.         yuv[0] = av_clip_uint8(yuv[0] - v);                             \
  71.         yuv += line_inc;                                                \
  72.     }                                                                   \
  73. }
  74.  
  75. VP56_EDGE_FILTER(vp5, hor, 1, stride)
  76. VP56_EDGE_FILTER(vp5, ver, stride, 1)
  77. VP56_EDGE_FILTER(vp6, hor, 1, stride)
  78. VP56_EDGE_FILTER(vp6, ver, stride, 1)
  79.  
  80. av_cold void ff_vp56dsp_init(VP56DSPContext *s, enum AVCodecID codec)
  81. {
  82.     if (codec == AV_CODEC_ID_VP5) {
  83.         s->edge_filter_hor = vp5_edge_filter_hor;
  84.         s->edge_filter_ver = vp5_edge_filter_ver;
  85.     } else {
  86.         s->edge_filter_hor = vp6_edge_filter_hor;
  87.         s->edge_filter_ver = vp6_edge_filter_ver;
  88.  
  89.         if (CONFIG_VP6_DECODER) {
  90.             s->vp6_filter_diag4 = ff_vp6_filter_diag4_c;
  91.  
  92.             if (ARCH_ARM)
  93.                 ff_vp6dsp_init_arm(s, codec);
  94.             if (ARCH_X86)
  95.                 ff_vp6dsp_init_x86(s, codec);
  96.         }
  97.     }
  98. }
  99.