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  1. /*
  2.  * H261 common code
  3.  * Copyright (c) 2002-2004 Michael Niedermayer <michaelni@gmx.at>
  4.  * Copyright (c) 2004 Maarten Daniels
  5.  *
  6.  * This file is part of FFmpeg.
  7.  *
  8.  * FFmpeg is free software; you can redistribute it and/or
  9.  * modify it under the terms of the GNU Lesser General Public
  10.  * License as published by the Free Software Foundation; either
  11.  * version 2.1 of the License, or (at your option) any later version.
  12.  *
  13.  * FFmpeg is distributed in the hope that it will be useful,
  14.  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  15.  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  16.  * Lesser General Public License for more details.
  17.  *
  18.  * You should have received a copy of the GNU Lesser General Public
  19.  * License along with FFmpeg; if not, write to the Free Software
  20.  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  21.  */
  22.  
  23. /**
  24.  * @file
  25.  * h261codec.
  26.  */
  27.  
  28. #include "avcodec.h"
  29. #include "h261.h"
  30.  
  31. #define IS_FIL(a)    ((a) & MB_TYPE_H261_FIL)
  32.  
  33. uint8_t ff_h261_rl_table_store[2][2 * MAX_RUN + MAX_LEVEL + 3];
  34.  
  35. static void h261_loop_filter(uint8_t *src, int stride)
  36. {
  37.     int x, y, xy, yz;
  38.     int temp[64];
  39.  
  40.     for (x = 0; x < 8; x++) {
  41.         temp[x]         = 4 * src[x];
  42.         temp[x + 7 * 8] = 4 * src[x + 7 * stride];
  43.     }
  44.     for (y = 1; y < 7; y++) {
  45.         for (x = 0; x < 8; x++) {
  46.             xy       = y * stride + x;
  47.             yz       = y * 8      + x;
  48.             temp[yz] = src[xy - stride] + 2 * src[xy] + src[xy + stride];
  49.         }
  50.     }
  51.  
  52.     for (y = 0; y < 8; y++) {
  53.         src[y * stride]     = (temp[y * 8]     + 2) >> 2;
  54.         src[y * stride + 7] = (temp[y * 8 + 7] + 2) >> 2;
  55.         for (x = 1; x < 7; x++) {
  56.             xy      = y * stride + x;
  57.             yz      = y * 8      + x;
  58.             src[xy] = (temp[yz - 1] + 2 * temp[yz] + temp[yz + 1] + 8) >> 4;
  59.         }
  60.     }
  61. }
  62.  
  63. void ff_h261_loop_filter(MpegEncContext *s)
  64. {
  65.     H261Context *h       = (H261Context *)s;
  66.     const int linesize   = s->linesize;
  67.     const int uvlinesize = s->uvlinesize;
  68.     uint8_t *dest_y      = s->dest[0];
  69.     uint8_t *dest_cb     = s->dest[1];
  70.     uint8_t *dest_cr     = s->dest[2];
  71.  
  72.     if (!(IS_FIL(h->mtype)))
  73.         return;
  74.  
  75.     h261_loop_filter(dest_y,                    linesize);
  76.     h261_loop_filter(dest_y + 8,                linesize);
  77.     h261_loop_filter(dest_y + 8 * linesize,     linesize);
  78.     h261_loop_filter(dest_y + 8 * linesize + 8, linesize);
  79.     h261_loop_filter(dest_cb, uvlinesize);
  80.     h261_loop_filter(dest_cr, uvlinesize);
  81. }
  82.  
  83. av_cold void ff_h261_common_init(void)
  84. {
  85.     static int done = 0;
  86.  
  87.     if (done)
  88.         return;
  89.  
  90.     ff_init_rl(&ff_h261_rl_tcoeff, ff_h261_rl_table_store);
  91.     done = 1;
  92. }
  93.