LCOV - code coverage report
Current view: top level - libavcodec - eaidct.c (source / functions) Hit Total Coverage
Test: coverage.info Lines: 19 19 100.0 %
Date: 2017-12-18 20:14:19 Functions: 2 2 100.0 %

          Line data    Source code
       1             : /*
       2             :  * Electronic Arts TGQ/TQI/MAD IDCT algorithm
       3             :  * Copyright (c) 2007-2008 Peter Ross <pross@xvid.org>
       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             : /**
      23             :  * @file
      24             :  * Electronic Arts TGQ/TQI/MAD IDCT algorithm
      25             :  * @author Peter Ross <pross@xvid.org>
      26             :  */
      27             : 
      28             : #include "eaidct.h"
      29             : #include "libavutil/common.h"
      30             : 
      31             : #define ASQRT 181 /* (1/sqrt(2))<<8 */
      32             : #define A4    669 /* cos(pi/8)*sqrt(2)<<9 */
      33             : #define A2    277 /* sin(pi/8)*sqrt(2)<<9 */
      34             : #define A5    196 /* sin(pi/8)<<9 */
      35             : 
      36             : #define IDCT_TRANSFORM(dest,s0,s1,s2,s3,s4,s5,s6,s7,d0,d1,d2,d3,d4,d5,d6,d7,munge,src) {\
      37             :     const int a1 = (src)[s1] + (src)[s7]; \
      38             :     const int a7 = (src)[s1] - (src)[s7]; \
      39             :     const int a5 = (src)[s5] + (src)[s3]; \
      40             :     const int a3 = (src)[s5] - (src)[s3]; \
      41             :     const int a2 = (src)[s2] + (src)[s6]; \
      42             :     const int a6 = (ASQRT*((src)[s2] - (src)[s6]))>>8; \
      43             :     const int a0 = (src)[s0] + (src)[s4]; \
      44             :     const int a4 = (src)[s0] - (src)[s4]; \
      45             :     const int b0 = (((A4-A5)*a7 - A5*a3)>>9) + a1+a5; \
      46             :     const int b1 = (((A4-A5)*a7 - A5*a3)>>9) + ((ASQRT*(a1-a5))>>8); \
      47             :     const int b2 = (((A2+A5)*a3 + A5*a7)>>9) + ((ASQRT*(a1-a5))>>8); \
      48             :     const int b3 =  ((A2+A5)*a3 + A5*a7)>>9; \
      49             :     (dest)[d0] = munge(a0+a2+a6+b0); \
      50             :     (dest)[d1] = munge(a4+a6   +b1); \
      51             :     (dest)[d2] = munge(a4-a6   +b2); \
      52             :     (dest)[d3] = munge(a0-a2-a6+b3); \
      53             :     (dest)[d4] = munge(a0-a2-a6-b3); \
      54             :     (dest)[d5] = munge(a4-a6   -b2); \
      55             :     (dest)[d6] = munge(a4+a6   -b1); \
      56             :     (dest)[d7] = munge(a0+a2+a6-b0); \
      57             : }
      58             : /* end IDCT_TRANSFORM macro */
      59             : 
      60             : #define MUNGE_NONE(x) (x)
      61             : #define IDCT_COL(dest,src) IDCT_TRANSFORM(dest,0,8,16,24,32,40,48,56,0,8,16,24,32,40,48,56,MUNGE_NONE,src)
      62             : 
      63             : #define MUNGE_8BIT(x) av_clip_uint8((x)>>4)
      64             : #define IDCT_ROW(dest,src) IDCT_TRANSFORM(dest,0,1,2,3,4,5,6,7,0,1,2,3,4,5,6,7,MUNGE_8BIT,src)
      65             : 
      66     2483072 : static inline void ea_idct_col(int16_t *dest, const int16_t *src) {
      67     2483072 :     if ((src[8]|src[16]|src[24]|src[32]|src[40]|src[48]|src[56])==0) {
      68     1910398 :         dest[0]  =
      69     3820796 :         dest[8]  =
      70     5731194 :         dest[16] =
      71     5731194 :         dest[24] =
      72     5731194 :         dest[32] =
      73     5731194 :         dest[40] =
      74     5731194 :         dest[48] =
      75     3820796 :         dest[56] = src[0];
      76             :     }else
      77      572674 :         IDCT_COL(dest, src);
      78     2483072 : }
      79             : 
      80      310384 : void ff_ea_idct_put_c(uint8_t *dest, ptrdiff_t linesize, int16_t *block)
      81             : {
      82             :     int i;
      83             :     int16_t temp[64];
      84      310384 :     block[0] += 4;
      85     2793456 :     for (i=0; i<8; i++)
      86     2483072 :         ea_idct_col(&temp[i], &block[i]);
      87     2793456 :     for (i=0; i<8; i++)
      88     2483072 :         IDCT_ROW( (&dest[i*linesize]), (&temp[8*i]) );
      89      310384 : }

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