LCOV - code coverage report
Current view: top level - libavcodec - faanidct.c (source / functions) Hit Total Coverage
Test: coverage.info Lines: 49 80 61.2 %
Date: 2017-12-16 01:21:47 Functions: 2 4 50.0 %

          Line data    Source code
       1             : /*
       2             :  * Floating point AAN IDCT
       3             :  * Copyright (c) 2008 Michael Niedermayer <michaelni@gmx.at>
       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             : #include "faanidct.h"
      22             : #include "libavutil/common.h"
      23             : 
      24             : /* To allow switching to double. */
      25             : typedef float FLOAT;
      26             : 
      27             : #define B0 1.0000000000000000000000
      28             : #define B1 1.3870398453221474618216 // cos(pi*1/16)sqrt(2)
      29             : #define B2 1.3065629648763765278566 // cos(pi*2/16)sqrt(2)
      30             : #define B3 1.1758756024193587169745 // cos(pi*3/16)sqrt(2)
      31             : #define B4 1.0000000000000000000000 // cos(pi*4/16)sqrt(2)
      32             : #define B5 0.7856949583871021812779 // cos(pi*5/16)sqrt(2)
      33             : #define B6 0.5411961001461969843997 // cos(pi*6/16)sqrt(2)
      34             : #define B7 0.2758993792829430123360 // cos(pi*7/16)sqrt(2)
      35             : 
      36             : #define A4 0.70710678118654752438 // cos(pi*4/16)
      37             : #define A2 0.92387953251128675613 // cos(pi*2/16)
      38             : 
      39             : static const FLOAT prescale[64]={
      40             : B0*B0/8, B0*B1/8, B0*B2/8, B0*B3/8, B0*B4/8, B0*B5/8, B0*B6/8, B0*B7/8,
      41             : B1*B0/8, B1*B1/8, B1*B2/8, B1*B3/8, B1*B4/8, B1*B5/8, B1*B6/8, B1*B7/8,
      42             : B2*B0/8, B2*B1/8, B2*B2/8, B2*B3/8, B2*B4/8, B2*B5/8, B2*B6/8, B2*B7/8,
      43             : B3*B0/8, B3*B1/8, B3*B2/8, B3*B3/8, B3*B4/8, B3*B5/8, B3*B6/8, B3*B7/8,
      44             : B4*B0/8, B4*B1/8, B4*B2/8, B4*B3/8, B4*B4/8, B4*B5/8, B4*B6/8, B4*B7/8,
      45             : B5*B0/8, B5*B1/8, B5*B2/8, B5*B3/8, B5*B4/8, B5*B5/8, B5*B6/8, B5*B7/8,
      46             : B6*B0/8, B6*B1/8, B6*B2/8, B6*B3/8, B6*B4/8, B6*B5/8, B6*B6/8, B6*B7/8,
      47             : B7*B0/8, B7*B1/8, B7*B2/8, B7*B3/8, B7*B4/8, B7*B5/8, B7*B6/8, B7*B7/8,
      48             : };
      49             : 
      50      120000 : static inline void p8idct(int16_t data[64], FLOAT temp[64], uint8_t *dest,
      51             :                           ptrdiff_t stride, int x, int y, int type)
      52             : {
      53             :     int i;
      54             :     FLOAT s04, d04, s17, d17, s26, d26, s53, d53;
      55             :     FLOAT os07, os16, os25, os34;
      56             :     FLOAT od07, od16, od25, od34;
      57             : 
      58     1080000 :     for(i=0; i<y*8; i+=y){
      59      960000 :         s17= temp[1*x + i] + temp[7*x + i];
      60      960000 :         d17= temp[1*x + i] - temp[7*x + i];
      61      960000 :         s53= temp[5*x + i] + temp[3*x + i];
      62      960000 :         d53= temp[5*x + i] - temp[3*x + i];
      63             : 
      64      960000 :         od07=  s17 + s53;
      65      960000 :         od25= (s17 - s53)*(2*A4);
      66             : 
      67      960000 :         od34=  d17*(2*(B6-A2)) - d53*(2*A2);
      68      960000 :         od16=  d53*(2*(A2-B2)) + d17*(2*A2);
      69             : 
      70      960000 :         od16 -= od07;
      71      960000 :         od25 -= od16;
      72      960000 :         od34 += od25;
      73             : 
      74      960000 :         s26 = temp[2*x + i] + temp[6*x + i];
      75      960000 :         d26 = temp[2*x + i] - temp[6*x + i];
      76      960000 :         d26*= 2*A4;
      77      960000 :         d26-= s26;
      78             : 
      79      960000 :         s04= temp[0*x + i] + temp[4*x + i];
      80      960000 :         d04= temp[0*x + i] - temp[4*x + i];
      81             : 
      82      960000 :         os07= s04 + s26;
      83      960000 :         os34= s04 - s26;
      84      960000 :         os16= d04 + d26;
      85      960000 :         os25= d04 - d26;
      86             : 
      87      960000 :         if(type==0){
      88      480000 :             temp[0*x + i]= os07 + od07;
      89      480000 :             temp[7*x + i]= os07 - od07;
      90      480000 :             temp[1*x + i]= os16 + od16;
      91      480000 :             temp[6*x + i]= os16 - od16;
      92      480000 :             temp[2*x + i]= os25 + od25;
      93      480000 :             temp[5*x + i]= os25 - od25;
      94      480000 :             temp[3*x + i]= os34 - od34;
      95      480000 :             temp[4*x + i]= os34 + od34;
      96      480000 :         }else if(type==1){
      97      480000 :             data[0*x + i]= lrintf(os07 + od07);
      98      480000 :             data[7*x + i]= lrintf(os07 - od07);
      99      480000 :             data[1*x + i]= lrintf(os16 + od16);
     100      480000 :             data[6*x + i]= lrintf(os16 - od16);
     101      480000 :             data[2*x + i]= lrintf(os25 + od25);
     102      480000 :             data[5*x + i]= lrintf(os25 - od25);
     103      480000 :             data[3*x + i]= lrintf(os34 - od34);
     104      480000 :             data[4*x + i]= lrintf(os34 + od34);
     105           0 :         }else if(type==2){
     106           0 :             dest[0*stride + i]= av_clip_uint8(((int)dest[0*stride + i]) + lrintf(os07 + od07));
     107           0 :             dest[7*stride + i]= av_clip_uint8(((int)dest[7*stride + i]) + lrintf(os07 - od07));
     108           0 :             dest[1*stride + i]= av_clip_uint8(((int)dest[1*stride + i]) + lrintf(os16 + od16));
     109           0 :             dest[6*stride + i]= av_clip_uint8(((int)dest[6*stride + i]) + lrintf(os16 - od16));
     110           0 :             dest[2*stride + i]= av_clip_uint8(((int)dest[2*stride + i]) + lrintf(os25 + od25));
     111           0 :             dest[5*stride + i]= av_clip_uint8(((int)dest[5*stride + i]) + lrintf(os25 - od25));
     112           0 :             dest[3*stride + i]= av_clip_uint8(((int)dest[3*stride + i]) + lrintf(os34 - od34));
     113           0 :             dest[4*stride + i]= av_clip_uint8(((int)dest[4*stride + i]) + lrintf(os34 + od34));
     114             :         }else{
     115           0 :             dest[0*stride + i]= av_clip_uint8(lrintf(os07 + od07));
     116           0 :             dest[7*stride + i]= av_clip_uint8(lrintf(os07 - od07));
     117           0 :             dest[1*stride + i]= av_clip_uint8(lrintf(os16 + od16));
     118           0 :             dest[6*stride + i]= av_clip_uint8(lrintf(os16 - od16));
     119           0 :             dest[2*stride + i]= av_clip_uint8(lrintf(os25 + od25));
     120           0 :             dest[5*stride + i]= av_clip_uint8(lrintf(os25 - od25));
     121           0 :             dest[3*stride + i]= av_clip_uint8(lrintf(os34 - od34));
     122           0 :             dest[4*stride + i]= av_clip_uint8(lrintf(os34 + od34));
     123             :         }
     124             :     }
     125      120000 : }
     126             : 
     127       60000 : void ff_faanidct(int16_t block[64]){
     128             :     FLOAT temp[64];
     129             :     int i;
     130             : 
     131       60000 :     emms_c();
     132             : 
     133     3900000 :     for(i=0; i<64; i++)
     134     3840000 :         temp[i] = block[i] * prescale[i];
     135             : 
     136       60000 :     p8idct(block, temp, NULL, 0, 1, 8, 0);
     137       60000 :     p8idct(block, temp, NULL, 0, 8, 1, 1);
     138       60000 : }
     139             : 
     140           0 : void ff_faanidct_add(uint8_t *dest, ptrdiff_t line_size, int16_t block[64])
     141             : {
     142             :     FLOAT temp[64];
     143             :     int i;
     144             : 
     145           0 :     emms_c();
     146             : 
     147           0 :     for(i=0; i<64; i++)
     148           0 :         temp[i] = block[i] * prescale[i];
     149             : 
     150           0 :     p8idct(block, temp, NULL,         0, 1, 8, 0);
     151           0 :     p8idct(NULL , temp, dest, line_size, 8, 1, 2);
     152           0 : }
     153             : 
     154           0 : void ff_faanidct_put(uint8_t *dest, ptrdiff_t line_size, int16_t block[64])
     155             : {
     156             :     FLOAT temp[64];
     157             :     int i;
     158             : 
     159           0 :     emms_c();
     160             : 
     161           0 :     for(i=0; i<64; i++)
     162           0 :         temp[i] = block[i] * prescale[i];
     163             : 
     164           0 :     p8idct(block, temp, NULL,         0, 1, 8, 0);
     165           0 :     p8idct(NULL , temp, dest, line_size, 8, 1, 3);
     166           0 : }

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