LCOV - code coverage report
Current view: top level - libavcodec - simple_idct.c (source / functions) Hit Total Coverage
Test: coverage.info Lines: 87 93 93.5 %
Date: 2018-05-20 11:54:08 Functions: 7 8 87.5 %

          Line data    Source code
       1             : /*
       2             :  * Simple IDCT
       3             :  *
       4             :  * Copyright (c) 2001 Michael Niedermayer <michaelni@gmx.at>
       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             :  * simpleidct in C.
      26             :  */
      27             : 
      28             : #include "libavutil/intreadwrite.h"
      29             : #include "avcodec.h"
      30             : #include "mathops.h"
      31             : #include "simple_idct.h"
      32             : 
      33             : #define IN_IDCT_DEPTH 16
      34             : 
      35             : #define BIT_DEPTH 8
      36             : #include "simple_idct_template.c"
      37             : #undef BIT_DEPTH
      38             : 
      39             : #define BIT_DEPTH 10
      40             : #include "simple_idct_template.c"
      41             : 
      42             : #define EXTRA_SHIFT  2
      43             : #include "simple_idct_template.c"
      44             : 
      45             : #undef EXTRA_SHIFT
      46             : #undef BIT_DEPTH
      47             : 
      48             : #define BIT_DEPTH 12
      49             : #include "simple_idct_template.c"
      50             : #undef BIT_DEPTH
      51             : #undef IN_IDCT_DEPTH
      52             : 
      53             : #define IN_IDCT_DEPTH 32
      54             : #define BIT_DEPTH 10
      55             : #include "simple_idct_template.c"
      56             : #undef BIT_DEPTH
      57             : #undef IN_IDCT_DEPTH
      58             : 
      59             : /* 2x4x8 idct */
      60             : 
      61             : #define CN_SHIFT 12
      62             : #define C_FIX(x) ((int)((x) * (1 << CN_SHIFT) + 0.5))
      63             : #define C1 C_FIX(0.6532814824)
      64             : #define C2 C_FIX(0.2705980501)
      65             : 
      66             : /* row idct is multiple by 16 * sqrt(2.0), col idct4 is normalized,
      67             :    and the butterfly must be multiplied by 0.5 * sqrt(2.0) */
      68             : #define C_SHIFT (4+1+12)
      69             : 
      70      324544 : static inline void idct4col_put(uint8_t *dest, ptrdiff_t line_size, const int16_t *col)
      71             : {
      72             :     int c0, c1, c2, c3, a0, a1, a2, a3;
      73             : 
      74      324544 :     a0 = col[8*0];
      75      324544 :     a1 = col[8*2];
      76      324544 :     a2 = col[8*4];
      77      324544 :     a3 = col[8*6];
      78      324544 :     c0 = ((a0 + a2) * (1 << CN_SHIFT - 1)) + (1 << (C_SHIFT - 1));
      79      324544 :     c2 = ((a0 - a2) * (1 << CN_SHIFT - 1)) + (1 << (C_SHIFT - 1));
      80      324544 :     c1 = a1 * C1 + a3 * C2;
      81      324544 :     c3 = a1 * C2 - a3 * C1;
      82      324544 :     dest[0] = av_clip_uint8((c0 + c1) >> C_SHIFT);
      83      324544 :     dest += line_size;
      84      324544 :     dest[0] = av_clip_uint8((c2 + c3) >> C_SHIFT);
      85      324544 :     dest += line_size;
      86      324544 :     dest[0] = av_clip_uint8((c2 - c3) >> C_SHIFT);
      87      324544 :     dest += line_size;
      88      324544 :     dest[0] = av_clip_uint8((c0 - c1) >> C_SHIFT);
      89      324544 : }
      90             : 
      91             : #define BF(k) \
      92             : {\
      93             :     int a0, a1;\
      94             :     a0 = ptr[k];\
      95             :     a1 = ptr[8 + k];\
      96             :     ptr[k] = a0 + a1;\
      97             :     ptr[8 + k] = a0 - a1;\
      98             : }
      99             : 
     100             : /* only used by DV codec. The input must be interlaced. 128 is added
     101             :    to the pixels before clamping to avoid systematic error
     102             :    (1024*sqrt(2)) offset would be needed otherwise. */
     103             : /* XXX: I think a 1.0/sqrt(2) normalization should be needed to
     104             :    compensate the extra butterfly stage - I don't have the full DV
     105             :    specification */
     106       20284 : void ff_simple_idct248_put(uint8_t *dest, ptrdiff_t line_size, int16_t *block)
     107             : {
     108             :     int i;
     109             :     int16_t *ptr;
     110             : 
     111             :     /* butterfly */
     112       20284 :     ptr = block;
     113      101420 :     for(i=0;i<4;i++) {
     114       81136 :         BF(0);
     115       81136 :         BF(1);
     116       81136 :         BF(2);
     117       81136 :         BF(3);
     118       81136 :         BF(4);
     119       81136 :         BF(5);
     120       81136 :         BF(6);
     121       81136 :         BF(7);
     122       81136 :         ptr += 2 * 8;
     123             :     }
     124             : 
     125             :     /* IDCT8 on each line */
     126      182556 :     for(i=0; i<8; i++) {
     127      162272 :         idctRowCondDC_int16_8bit(block + i*8, 0);
     128             :     }
     129             : 
     130             :     /* IDCT4 and store */
     131      182556 :     for(i=0;i<8;i++) {
     132      162272 :         idct4col_put(dest + i, 2 * line_size, block + i);
     133      162272 :         idct4col_put(dest + line_size + i, 2 * line_size, block + 8 + i);
     134             :     }
     135       20284 : }
     136             : 
     137             : /* 8x4 & 4x8 WMV2 IDCT */
     138             : #undef CN_SHIFT
     139             : #undef C_SHIFT
     140             : #undef C_FIX
     141             : #undef C1
     142             : #undef C2
     143             : #define CN_SHIFT 12
     144             : #define C_FIX(x) ((int)((x) * M_SQRT2 * (1 << CN_SHIFT) + 0.5))
     145             : #define C1 C_FIX(0.6532814824)
     146             : #define C2 C_FIX(0.2705980501)
     147             : #define C3 C_FIX(0.5)
     148             : #define C_SHIFT (4+1+12)
     149      263504 : static inline void idct4col_add(uint8_t *dest, ptrdiff_t line_size, const int16_t *col)
     150             : {
     151             :     int c0, c1, c2, c3, a0, a1, a2, a3;
     152             : 
     153      263504 :     a0 = col[8*0];
     154      263504 :     a1 = col[8*1];
     155      263504 :     a2 = col[8*2];
     156      263504 :     a3 = col[8*3];
     157      263504 :     c0 = (a0 + a2)*C3 + (1 << (C_SHIFT - 1));
     158      263504 :     c2 = (a0 - a2)*C3 + (1 << (C_SHIFT - 1));
     159      263504 :     c1 = a1 * C1 + a3 * C2;
     160      263504 :     c3 = a1 * C2 - a3 * C1;
     161      263504 :     dest[0] = av_clip_uint8(dest[0] + ((c0 + c1) >> C_SHIFT));
     162      263504 :     dest += line_size;
     163      263504 :     dest[0] = av_clip_uint8(dest[0] + ((c2 + c3) >> C_SHIFT));
     164      263504 :     dest += line_size;
     165      263504 :     dest[0] = av_clip_uint8(dest[0] + ((c2 - c3) >> C_SHIFT));
     166      263504 :     dest += line_size;
     167      263504 :     dest[0] = av_clip_uint8(dest[0] + ((c0 - c1) >> C_SHIFT));
     168      263504 : }
     169             : 
     170             : #define RN_SHIFT 15
     171             : #define R_FIX(x) ((int)((x) * M_SQRT2 * (1 << RN_SHIFT) + 0.5))
     172             : #define R1 R_FIX(0.6532814824)
     173             : #define R2 R_FIX(0.2705980501)
     174             : #define R3 R_FIX(0.5)
     175             : #define R_SHIFT 11
     176      239648 : static inline void idct4row(int16_t *row)
     177             : {
     178             :     int c0, c1, c2, c3, a0, a1, a2, a3;
     179             : 
     180      239648 :     a0 = row[0];
     181      239648 :     a1 = row[1];
     182      239648 :     a2 = row[2];
     183      239648 :     a3 = row[3];
     184      239648 :     c0 = (a0 + a2)*R3 + (1 << (R_SHIFT - 1));
     185      239648 :     c2 = (a0 - a2)*R3 + (1 << (R_SHIFT - 1));
     186      239648 :     c1 = a1 * R1 + a3 * R2;
     187      239648 :     c3 = a1 * R2 - a3 * R1;
     188      239648 :     row[0]= (c0 + c1) >> R_SHIFT;
     189      239648 :     row[1]= (c2 + c3) >> R_SHIFT;
     190      239648 :     row[2]= (c2 - c3) >> R_SHIFT;
     191      239648 :     row[3]= (c0 - c1) >> R_SHIFT;
     192      239648 : }
     193             : 
     194       32938 : void ff_simple_idct84_add(uint8_t *dest, ptrdiff_t line_size, int16_t *block)
     195             : {
     196             :     int i;
     197             : 
     198             :     /* IDCT8 on each line */
     199      164690 :     for(i=0; i<4; i++) {
     200      131752 :         idctRowCondDC_int16_8bit(block + i*8, 0);
     201             :     }
     202             : 
     203             :     /* IDCT4 and store */
     204      296442 :     for(i=0;i<8;i++) {
     205      263504 :         idct4col_add(dest + i, line_size, block + i);
     206             :     }
     207       32938 : }
     208             : 
     209       29956 : void ff_simple_idct48_add(uint8_t *dest, ptrdiff_t line_size, int16_t *block)
     210             : {
     211             :     int i;
     212             : 
     213             :     /* IDCT4 on each line */
     214      269604 :     for(i=0; i<8; i++) {
     215      239648 :         idct4row(block + i*8);
     216             :     }
     217             : 
     218             :     /* IDCT8 and store */
     219      149780 :     for(i=0; i<4; i++){
     220      119824 :         idctSparseColAdd_int16_8bit(dest + i, line_size, block + i);
     221             :     }
     222       29956 : }
     223             : 
     224           0 : void ff_simple_idct44_add(uint8_t *dest, ptrdiff_t line_size, int16_t *block)
     225             : {
     226             :     int i;
     227             : 
     228             :     /* IDCT4 on each line */
     229           0 :     for(i=0; i<4; i++) {
     230           0 :         idct4row(block + i*8);
     231             :     }
     232             : 
     233             :     /* IDCT4 and store */
     234           0 :     for(i=0; i<4; i++){
     235           0 :         idct4col_add(dest + i, line_size, block + i);
     236             :     }
     237           0 : }
     238             : 
     239     2818752 : void ff_prores_idct(int16_t *block, const int16_t *qmat)
     240             : {
     241             :     int i;
     242             : 
     243   183218880 :     for (i = 0; i < 64; i++)
     244   180400128 :         block[i] *= qmat[i];
     245             : 
     246    25368768 :     for (i = 0; i < 8; i++)
     247    22550016 :         idctRowCondDC_extrashift_10(block + i*8, 2);
     248             : 
     249    25368768 :     for (i = 0; i < 8; i++) {
     250    22550016 :         block[i] += 8192;
     251    22550016 :         idctSparseCol_extrashift_10(block + i);
     252             :     }
     253     2818752 : }

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