libavcodec/vp6dsp.c

   1 /**
   2  * @file libavcodec/vp6dsp.c
   3  * VP6 DSP-oriented functions
   4  *
   5  * Copyright (C) 2006  Aurelien Jacobs <aurel@gnuage.org>
   6  *
   7  * This file is part of FFmpeg.
   8  *
   9  * FFmpeg is free software; you can redistribute it and/or
  10  * modify it under the terms of the GNU Lesser General Public
  11  * License as published by the Free Software Foundation; either
  12  * version 2.1 of the License, or (at your option) any later version.
  13  *
  14  * FFmpeg is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  17  * Lesser General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU Lesser General Public
  20  * License along with FFmpeg; if not, write to the Free Software
  21  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  22  */
  23
  24 #include "libavutil/common.h"
  25 #include "dsputil.h"
  26
  27
  28 void ff_vp6_filter_diag4_c(uint8_t *dst, uint8_t *src, int stride,
  29                            const int16_t *h_weights, const int16_t *v_weights)
  30 {
  31     int x, y;
  32     int tmp[8*11];
  33     int *t = tmp;
  34
  35     src -= stride;
  36
  37     for (y=0; y<11; y++) {
  38         for (x=0; x<8; x++) {
  39             t[x] = av_clip_uint8((  src[x-1] * h_weights[0]
  40                                + src[x  ] * h_weights[1]
  41                                + src[x+1] * h_weights[2]
  42                                + src[x+2] * h_weights[3] + 64) >> 7);
  43         }
  44         src += stride;
  45         t += 8;
  46     }
  47
  48     t = tmp + 8;
  49     for (y=0; y<8; y++) {
  50         for (x=0; x<8; x++) {
  51             dst[x] = av_clip_uint8((  t[x-8 ] * v_weights[0]
  52                                  + t[x   ] * v_weights[1]
  53                                  + t[x+8 ] * v_weights[2]
  54                                  + t[x+16] * v_weights[3] + 64) >> 7);
  55         }
  56         dst += stride;
  57         t += 8;
  58     }
  59 }