tizen/distrib/ffmpeg/libavcodec/vp56dsp.c

   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 #include "avcodec.h"
  24 #include "vp56dsp.h"
  25
  26 /* Gives very similar result than the vp6 version except in a few cases */
  27 static int vp5_adjust(int v, int t)
  28 {
  29     int s2, s1 = v >> 31;
  30     v ^= s1;
  31     v -= s1;
  32     v *= v < 2*t;
  33     v -= t;
  34     s2 = v >> 31;
  35     v ^= s2;
  36     v -= s2;
  37     v = t - v;
  38     v += s1;
  39     v ^= s1;
  40     return v;
  41 }
  42
  43 static int vp6_adjust(int v, int t)
  44 {
  45     int V = v, s = v >> 31;
  46     V ^= s;
  47     V -= s;
  48     if (V-t-1 >= (unsigned)(t-1))
  49         return v;
  50     V = 2*t - V;
  51     V += s;
  52     V ^= s;
  53     return V;
  54 }
  55
  56
  57 #define VP56_EDGE_FILTER(pfx, suf, pix_inc, line_inc)                   \
  58 static void pfx##_edge_filter_##suf(uint8_t *yuv, int stride, int t)    \
  59 {                                                                       \
  60     int pix2_inc = 2 * pix_inc;                                         \
  61     int i, v;                                                           \
  62                                                                         \
  63     for (i=0; i<12; i++) {                                              \
  64         v = (yuv[-pix2_inc] + 3*(yuv[0]-yuv[-pix_inc]) - yuv[pix_inc] + 4)>>3;\
  65         v = pfx##_adjust(v, t);                                         \
  66         yuv[-pix_inc] = av_clip_uint8(yuv[-pix_inc] + v);               \
  67         yuv[0] = av_clip_uint8(yuv[0] - v);                             \
  68         yuv += line_inc;                                                \
  69     }                                                                   \
  70 }
  71
  72 VP56_EDGE_FILTER(vp5, hor, 1, stride)
  73 VP56_EDGE_FILTER(vp5, ver, stride, 1)
  74 VP56_EDGE_FILTER(vp6, hor, 1, stride)
  75 VP56_EDGE_FILTER(vp6, ver, stride, 1)
  76
  77 void ff_vp56dsp_init(VP56DSPContext *s, enum CodecID codec)
  78 {
  79     if (codec == CODEC_ID_VP5) {
  80         s->edge_filter_hor = vp5_edge_filter_hor;
  81         s->edge_filter_ver = vp5_edge_filter_ver;
  82     } else {
  83         s->edge_filter_hor = vp6_edge_filter_hor;
  84         s->edge_filter_ver = vp6_edge_filter_ver;
  85     }
  86
  87     if (ARCH_ARM) ff_vp56dsp_init_arm(s, codec);
  88 }