LCOV - code coverage report
Current view: top level - libavcodec - mss34dsp.c (source / functions) Hit Total Coverage
Test: coverage.info Lines: 23 25 92.0 %
Date: 2017-12-14 01:15:32 Functions: 2 2 100.0 %

          Line data    Source code
       1             : /*
       2             :  * Common stuff for some Microsoft Screen codecs
       3             :  * Copyright (C) 2012 Konstantin Shishkov
       4             :  *
       5             :  * This file is part of FFmpeg.
       6             :  *
       7             :  * FFmpeg is free software; you can redistribute it and/or
       8             :  * modify it under the terms of the GNU Lesser General Public
       9             :  * License as published by the Free Software Foundation; either
      10             :  * version 2.1 of the License, or (at your option) any later version.
      11             :  *
      12             :  * FFmpeg is distributed in the hope that it will be useful,
      13             :  * but WITHOUT ANY WARRANTY; without even the implied warranty of
      14             :  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
      15             :  * Lesser General Public License for more details.
      16             :  *
      17             :  * You should have received a copy of the GNU Lesser General Public
      18             :  * License along with FFmpeg; if not, write to the Free Software
      19             :  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
      20             :  */
      21             : 
      22             : #include <stdint.h>
      23             : #include "libavutil/common.h"
      24             : #include "mss34dsp.h"
      25             : 
      26             : static const uint8_t luma_quant[64] = {
      27             :     16,  11,  10,  16,  24,  40,  51,  61,
      28             :     12,  12,  14,  19,  26,  58,  60,  55,
      29             :     14,  13,  16,  24,  40,  57,  69,  56,
      30             :     14,  17,  22,  29,  51,  87,  80,  62,
      31             :     18,  22,  37,  56,  68, 109, 103,  77,
      32             :     24,  35,  55,  64,  81, 104, 113,  92,
      33             :     49,  64,  78,  87, 103, 121, 120, 101,
      34             :     72,  92,  95,  98, 112, 100, 103,  99
      35             : };
      36             : 
      37             : static const uint8_t chroma_quant[64] = {
      38             :     17, 18, 24, 47, 99, 99, 99, 99,
      39             :     18, 21, 26, 66, 99, 99, 99, 99,
      40             :     24, 26, 56, 99, 99, 99, 99, 99,
      41             :     47, 66, 99, 99, 99, 99, 99, 99,
      42             :     99, 99, 99, 99, 99, 99, 99, 99,
      43             :     99, 99, 99, 99, 99, 99, 99, 99,
      44             :     99, 99, 99, 99, 99, 99, 99, 99,
      45             :     99, 99, 99, 99, 99, 99, 99, 99
      46             : };
      47             : 
      48           4 : void ff_mss34_gen_quant_mat(uint16_t *qmat, int quality, int luma)
      49             : {
      50             :     int i;
      51           4 :     const uint8_t *qsrc = luma ? luma_quant : chroma_quant;
      52             : 
      53           4 :     if (quality >= 50) {
      54           4 :         int scale = 200 - 2 * quality;
      55             : 
      56         260 :         for (i = 0; i < 64; i++)
      57         256 :             qmat[i] = (qsrc[i] * scale + 50) / 100;
      58             :     } else {
      59           0 :         for (i = 0; i < 64; i++)
      60           0 :             qmat[i] = (5000 * qsrc[i] / quality + 50) / 100;
      61             :     }
      62           4 : }
      63             : 
      64             : #define DCT_TEMPLATE(blk, step, SOP, shift)                         \
      65             :     const unsigned t0 =-39409U * blk[7 * step] - 58980U * blk[1 * step]; \
      66             :     const unsigned t1 = 39410U * blk[1 * step] - 58980U * blk[7 * step]; \
      67             :     const unsigned t2 =-33410U * blk[5 * step] -167963U * blk[3 * step]; \
      68             :     const unsigned t3 = 33410U * blk[3 * step] -167963U * blk[5 * step]; \
      69             :     const unsigned t4 =          blk[3 * step] +          blk[7 * step]; \
      70             :     const unsigned t5 =          blk[1 * step] +          blk[5 * step]; \
      71             :     const unsigned t6 = 77062U * t4            + 51491U * t5;            \
      72             :     const unsigned t7 = 77062U * t5            - 51491U * t4;            \
      73             :     const unsigned t8 = 35470U * blk[2 * step] - 85623U * blk[6 * step]; \
      74             :     const unsigned t9 = 35470U * blk[6 * step] + 85623U * blk[2 * step]; \
      75             :     const unsigned tA = SOP(blk[0 * step] - blk[4 * step]);              \
      76             :     const unsigned tB = SOP(blk[0 * step] + blk[4 * step]);              \
      77             :                                                                     \
      78             :     blk[0 * step] = (int)(  t1 + t6  + t9 + tB) >> shift;                \
      79             :     blk[1 * step] = (int)(  t3 + t7  + t8 + tA) >> shift;                \
      80             :     blk[2 * step] = (int)(  t2 + t6  - t8 + tA) >> shift;                \
      81             :     blk[3 * step] = (int)(  t0 + t7  - t9 + tB) >> shift;                \
      82             :     blk[4 * step] = (int)(-(t0 + t7) - t9 + tB) >> shift;                \
      83             :     blk[5 * step] = (int)(-(t2 + t6) - t8 + tA) >> shift;                \
      84             :     blk[6 * step] = (int)(-(t3 + t7) + t8 + tA) >> shift;                \
      85             :     blk[7 * step] = (int)(-(t1 + t6) + t9 + tB) >> shift;                \
      86             : 
      87             : #define SOP_ROW(a) (((a) * (1U << 16)) + 0x2000)
      88             : #define SOP_COL(a) (((a) + 32) * (1U << 16))
      89             : 
      90       85284 : void ff_mss34_dct_put(uint8_t *dst, ptrdiff_t stride, int *block)
      91             : {
      92             :     int i, j;
      93             :     int *ptr;
      94             : 
      95       85284 :     ptr = block;
      96      767556 :     for (i = 0; i < 8; i++) {
      97      682272 :         DCT_TEMPLATE(ptr, 1, SOP_ROW, 13);
      98      682272 :         ptr += 8;
      99             :     }
     100             : 
     101       85284 :     ptr = block;
     102      767556 :     for (i = 0; i < 8; i++) {
     103      682272 :         DCT_TEMPLATE(ptr, 8, SOP_COL, 22);
     104      682272 :         ptr++;
     105             :     }
     106             : 
     107       85284 :     ptr = block;
     108      767556 :     for (j = 0; j < 8; j++) {
     109     6140448 :         for (i = 0; i < 8; i++)
     110     5458176 :             dst[i] = av_clip_uint8(ptr[i] + 128);
     111      682272 :         dst += stride;
     112      682272 :         ptr += 8;
     113             :     }
     114       85284 : }

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