libavcodec/vp6dsp.c

   1 /*
   2  * Copyright (C) 2006  Aurelien Jacobs <aurel@gnuage.org>
   3  *
   4  * This file is part of Libav.
   5  *
   6  * Libav is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2.1 of the License, or (at your option) any later version.
  10  *
  11  * Libav is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public
  17  * License along with Libav; if not, write to the Free Software
  18  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  19  */
  20
  21 /**
  22  * @file
  23  * VP6 DSP-oriented functions
  24  */
  25
  26 #include "libavutil/common.h"
  27 #include "vp56dsp.h"
  28
  29
  30 void ff_vp6_filter_diag4_c(uint8_t *dst, uint8_t *src, int stride,
  31                            const int16_t *h_weights, const int16_t *v_weights)
  32 {
  33     int x, y;
  34     int tmp[8*11];
  35     int *t = tmp;
  36
  37     src -= stride;
  38
  39     for (y=0; y<11; y++) {
  40         for (x=0; x<8; x++) {
  41             t[x] = av_clip_uint8((  src[x-1] * h_weights[0]
  42                                + src[x  ] * h_weights[1]
  43                                + src[x+1] * h_weights[2]
  44                                + src[x+2] * h_weights[3] + 64) >> 7);
  45         }
  46         src += stride;
  47         t += 8;
  48     }
  49
  50     t = tmp + 8;
  51     for (y=0; y<8; y++) {
  52         for (x=0; x<8; x++) {
  53             dst[x] = av_clip_uint8((  t[x-8 ] * v_weights[0]
  54                                  + t[x   ] * v_weights[1]
  55                                  + t[x+8 ] * v_weights[2]
  56                                  + t[x+16] * v_weights[3] + 64) >> 7);
  57         }
  58         dst += stride;
  59         t += 8;
  60     }
  61 }