LCOV - code coverage report
Current view: top level - libavcodec - h263dsp.c (source / functions) Hit Total Coverage
Test: coverage.info Lines: 65 65 100.0 %
Date: 2017-12-16 21:16:39 Functions: 3 3 100.0 %

          Line data    Source code
       1             : /*
       2             :  * This file is part of FFmpeg.
       3             :  *
       4             :  * FFmpeg is free software; you can redistribute it and/or
       5             :  * modify it under the terms of the GNU Lesser General Public
       6             :  * License as published by the Free Software Foundation; either
       7             :  * version 2.1 of the License, or (at your option) any later version.
       8             :  *
       9             :  * FFmpeg is distributed in the hope that it will be useful,
      10             :  * but WITHOUT ANY WARRANTY; without even the implied warranty of
      11             :  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
      12             :  * Lesser General Public License for more details.
      13             :  *
      14             :  * You should have received a copy of the GNU Lesser General Public
      15             :  * License along with FFmpeg; if not, write to the Free Software
      16             :  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
      17             :  */
      18             : 
      19             : #include <stdint.h>
      20             : 
      21             : #include "libavutil/attributes.h"
      22             : #include "libavutil/common.h"
      23             : #include "config.h"
      24             : #include "h263dsp.h"
      25             : 
      26             : const uint8_t ff_h263_loop_filter_strength[32] = {
      27             :     0, 1, 1, 2, 2, 3, 3,  4,  4,  4,  5,  5,  6,  6,  7, 7,
      28             :     7, 8, 8, 8, 9, 9, 9, 10, 10, 10, 11, 11, 11, 12, 12, 12
      29             : };
      30             : 
      31     1147230 : static void h263_h_loop_filter_c(uint8_t *src, int stride, int qscale)
      32             : {
      33             :     int y;
      34     1147230 :     const int strength = ff_h263_loop_filter_strength[qscale];
      35             : 
      36    10325070 :     for (y = 0; y < 8; y++) {
      37             :         int d1, d2, ad1;
      38     9177840 :         int p0 = src[y * stride - 2];
      39     9177840 :         int p1 = src[y * stride - 1];
      40     9177840 :         int p2 = src[y * stride + 0];
      41     9177840 :         int p3 = src[y * stride + 1];
      42     9177840 :         int d  = (p0 - p3 + 4 * (p2 - p1)) / 8;
      43             : 
      44     9177840 :         if (d < -2 * strength)
      45      192361 :             d1 = 0;
      46     8985479 :         else if (d < -strength)
      47      249635 :             d1 = -2 * strength - d;
      48     8735844 :         else if (d < strength)
      49     8091081 :             d1 = d;
      50      644763 :         else if (d < 2 * strength)
      51      385771 :             d1 = 2 * strength - d;
      52             :         else
      53      258992 :             d1 = 0;
      54             : 
      55     9177840 :         p1 += d1;
      56     9177840 :         p2 -= d1;
      57     9177840 :         if (p1 & 256)
      58         158 :             p1 = ~(p1 >> 31);
      59     9177840 :         if (p2 & 256)
      60          34 :             p2 = ~(p2 >> 31);
      61             : 
      62     9177840 :         src[y * stride - 1] = p1;
      63     9177840 :         src[y * stride + 0] = p2;
      64             : 
      65     9177840 :         ad1 = FFABS(d1) >> 1;
      66             : 
      67     9177840 :         d2 = av_clip((p0 - p3) / 4, -ad1, ad1);
      68             : 
      69     9177840 :         src[y * stride - 2] = p0 - d2;
      70     9177840 :         src[y * stride + 1] = p3 + d2;
      71             :     }
      72     1147230 : }
      73             : 
      74     1159618 : static void h263_v_loop_filter_c(uint8_t *src, int stride, int qscale)
      75             : {
      76             :     int x;
      77     1159618 :     const int strength = ff_h263_loop_filter_strength[qscale];
      78             : 
      79    10436562 :     for (x = 0; x < 8; x++) {
      80             :         int d1, d2, ad1;
      81     9276944 :         int p0 = src[x - 2 * stride];
      82     9276944 :         int p1 = src[x - 1 * stride];
      83     9276944 :         int p2 = src[x + 0 * stride];
      84     9276944 :         int p3 = src[x + 1 * stride];
      85     9276944 :         int d  = (p0 - p3 + 4 * (p2 - p1)) / 8;
      86             : 
      87     9276944 :         if (d < -2 * strength)
      88      243648 :             d1 = 0;
      89     9033296 :         else if (d < -strength)
      90      252530 :             d1 = -2 * strength - d;
      91     8780766 :         else if (d < strength)
      92     8043139 :             d1 = d;
      93      737627 :         else if (d < 2 * strength)
      94      438839 :             d1 = 2 * strength - d;
      95             :         else
      96      298788 :             d1 = 0;
      97             : 
      98     9276944 :         p1 += d1;
      99     9276944 :         p2 -= d1;
     100     9276944 :         if (p1 & 256)
     101          74 :             p1 = ~(p1 >> 31);
     102     9276944 :         if (p2 & 256)
     103         180 :             p2 = ~(p2 >> 31);
     104             : 
     105     9276944 :         src[x - 1 * stride] = p1;
     106     9276944 :         src[x + 0 * stride] = p2;
     107             : 
     108     9276944 :         ad1 = FFABS(d1) >> 1;
     109             : 
     110     9276944 :         d2 = av_clip((p0 - p3) / 4, -ad1, ad1);
     111             : 
     112     9276944 :         src[x - 2 * stride] = p0 - d2;
     113     9276944 :         src[x + stride]     = p3 + d2;
     114             :     }
     115     1159618 : }
     116             : 
     117         552 : av_cold void ff_h263dsp_init(H263DSPContext *ctx)
     118             : {
     119         552 :     ctx->h263_h_loop_filter = h263_h_loop_filter_c;
     120         552 :     ctx->h263_v_loop_filter = h263_v_loop_filter_c;
     121             : 
     122             :     if (ARCH_X86)
     123         552 :         ff_h263dsp_init_x86(ctx);
     124             :     if (ARCH_MIPS)
     125             :         ff_h263dsp_init_mips(ctx);
     126         552 : }

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