LCOV - code coverage report
Current view: top level - libavcodec - h261.c (source / functions) Hit Total Coverage
Test: coverage.info Lines: 14 37 37.8 %
Date: 2017-12-17 16:07:53 Functions: 2 3 66.7 %

          Line data    Source code
       1             : /*
       2             :  * H.261 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             :  * H.261 codec
      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           0 : static void h261_loop_filter(uint8_t *src, int stride)
      36             : {
      37             :     int x, y, xy, yz;
      38             :     int temp[64];
      39             : 
      40           0 :     for (x = 0; x < 8; x++) {
      41           0 :         temp[x]         = 4 * src[x];
      42           0 :         temp[x + 7 * 8] = 4 * src[x + 7 * stride];
      43             :     }
      44           0 :     for (y = 1; y < 7; y++) {
      45           0 :         for (x = 0; x < 8; x++) {
      46           0 :             xy       = y * stride + x;
      47           0 :             yz       = y * 8      + x;
      48           0 :             temp[yz] = src[xy - stride] + 2 * src[xy] + src[xy + stride];
      49             :         }
      50             :     }
      51             : 
      52           0 :     for (y = 0; y < 8; y++) {
      53           0 :         src[y * stride]     = (temp[y * 8]     + 2) >> 2;
      54           0 :         src[y * stride + 7] = (temp[y * 8 + 7] + 2) >> 2;
      55           0 :         for (x = 1; x < 7; x++) {
      56           0 :             xy      = y * stride + x;
      57           0 :             yz      = y * 8      + x;
      58           0 :             src[xy] = (temp[yz - 1] + 2 * temp[yz] + temp[yz + 1] + 8) >> 4;
      59             :         }
      60             :     }
      61           0 : }
      62             : 
      63      205957 : void ff_h261_loop_filter(MpegEncContext *s)
      64             : {
      65      205957 :     H261Context *h       = (H261Context *)s;
      66      205957 :     const int linesize   = s->linesize;
      67      205957 :     const int uvlinesize = s->uvlinesize;
      68      205957 :     uint8_t *dest_y      = s->dest[0];
      69      205957 :     uint8_t *dest_cb     = s->dest[1];
      70      205957 :     uint8_t *dest_cr     = s->dest[2];
      71             : 
      72      205957 :     if (!(IS_FIL(h->mtype)))
      73      205957 :         return;
      74             : 
      75           0 :     h261_loop_filter(dest_y,                    linesize);
      76           0 :     h261_loop_filter(dest_y + 8,                linesize);
      77           0 :     h261_loop_filter(dest_y + 8 * linesize,     linesize);
      78           0 :     h261_loop_filter(dest_y + 8 * linesize + 8, linesize);
      79           0 :     h261_loop_filter(dest_cb, uvlinesize);
      80           0 :     h261_loop_filter(dest_cr, uvlinesize);
      81             : }
      82             : 
      83          19 : av_cold void ff_h261_common_init(void)
      84             : {
      85             :     static int done = 0;
      86             : 
      87          19 :     if (done)
      88           6 :         return;
      89             : 
      90          13 :     ff_rl_init(&ff_h261_rl_tcoeff, ff_h261_rl_table_store);
      91          13 :     done = 1;
      92             : }

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