git.sesse.net Git - ffmpeg/blob - 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
  24 #include "libavutil/attributes.h"
  25 #include "avcodec.h"
  26 #include "vp56dsp.h"
  27 #include "libavutil/common.h"
  28
  29 #define VP56_EDGE_FILTER(pfx, suf, pix_inc, line_inc)                   \
  30 static void pfx ## _edge_filter_ ## suf(uint8_t *yuv, ptrdiff_t stride, \
  31                                         int t)                          \
  32 {                                                                       \
  33     int pix2_inc = 2 * pix_inc;                                         \
  34     int i, v;                                                           \
  35                                                                         \
  36     for (i=0; i<12; i++) {                                              \
  37         v = (yuv[-pix2_inc] + 3*(yuv[0]-yuv[-pix_inc]) - yuv[pix_inc] + 4)>>3;\
  38         v = pfx##_adjust(v, t);                                         \
  39         yuv[-pix_inc] = av_clip_uint8(yuv[-pix_inc] + v);               \
  40         yuv[0] = av_clip_uint8(yuv[0] - v);                             \
  41         yuv += line_inc;                                                \
  42     }                                                                   \
  43 }
  44
  45 #if CONFIG_VP5_DECODER
  46 /* Gives very similar result than the vp6 version except in a few cases */
  47 static int vp5_adjust(int v, int t)
  48 {
  49     int s2, s1 = v >> 31;
  50     v ^= s1;
  51     v -= s1;
  52     v *= v < 2*t;
  53     v -= t;
  54     s2 = v >> 31;
  55     v ^= s2;
  56     v -= s2;
  57     v = t - v;
  58     v += s1;
  59     v ^= s1;
  60     return v;
  61 }
  62
  63
  64 VP56_EDGE_FILTER(vp5, hor, 1, stride)
  65 VP56_EDGE_FILTER(vp5, ver, stride, 1)
  66
  67 av_cold void ff_vp5dsp_init(VP56DSPContext *s)
  68 {
  69     s->edge_filter_hor = vp5_edge_filter_hor;
  70     s->edge_filter_ver = vp5_edge_filter_ver;
  71 }
  72 #endif /* CONFIG_VP5_DECODER */
  73
  74 #if CONFIG_VP6_DECODER
  75 static int vp6_adjust(int v, int t)
  76 {
  77     int V = v, s = v >> 31;
  78     V ^= s;
  79     V -= s;
  80     if (V-t-1 >= (unsigned)(t-1))
  81         return v;
  82     V = 2*t - V;
  83     V += s;
  84     V ^= s;
  85     return V;
  86 }
  87
  88 VP56_EDGE_FILTER(vp6, hor, 1, stride)
  89 VP56_EDGE_FILTER(vp6, ver, stride, 1)
  90
  91 av_cold void ff_vp6dsp_init(VP56DSPContext *s)
  92 {
  93     s->edge_filter_hor = vp6_edge_filter_hor;
  94     s->edge_filter_ver = vp6_edge_filter_ver;
  95
  96     s->vp6_filter_diag4 = ff_vp6_filter_diag4_c;
  97
  98     if (ARCH_ARM)
  99         ff_vp6dsp_init_arm(s);
 100     if (ARCH_X86)
 101         ff_vp6dsp_init_x86(s);
 102 }
 103 #endif /* CONFIG_VP6_DECODER */