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  1. /*
  2.  * H.264 IDCT
  3.  * Copyright (c) 2004-2011 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.  
  22. /**
  23.  * @file
  24.  * H.264 IDCT.
  25.  * @author Michael Niedermayer <michaelni@gmx.at>
  26.  */
  27.  
  28. #include "bit_depth_template.c"
  29. #include "libavutil/common.h"
  30. #include "h264.h"
  31. #include "h264idct.h"
  32.  
  33. void FUNCC(ff_h264_idct_add)(uint8_t *_dst, int16_t *_block, int stride)
  34. {
  35.     int i;
  36.     pixel *dst = (pixel*)_dst;
  37.     dctcoef *block = (dctcoef*)_block;
  38.     stride >>= sizeof(pixel)-1;
  39.  
  40.     block[0] += 1 << 5;
  41.  
  42.     for(i=0; i<4; i++){
  43.         const int z0=  block[i + 4*0]     +  block[i + 4*2];
  44.         const int z1=  block[i + 4*0]     -  block[i + 4*2];
  45.         const int z2= (block[i + 4*1]>>1) -  block[i + 4*3];
  46.         const int z3=  block[i + 4*1]     + (block[i + 4*3]>>1);
  47.  
  48.         block[i + 4*0]= z0 + z3;
  49.         block[i + 4*1]= z1 + z2;
  50.         block[i + 4*2]= z1 - z2;
  51.         block[i + 4*3]= z0 - z3;
  52.     }
  53.  
  54.     for(i=0; i<4; i++){
  55.         const int z0=  block[0 + 4*i]     +  block[2 + 4*i];
  56.         const int z1=  block[0 + 4*i]     -  block[2 + 4*i];
  57.         const int z2= (block[1 + 4*i]>>1) -  block[3 + 4*i];
  58.         const int z3=  block[1 + 4*i]     + (block[3 + 4*i]>>1);
  59.  
  60.         dst[i + 0*stride]= av_clip_pixel(dst[i + 0*stride] + ((z0 + z3) >> 6));
  61.         dst[i + 1*stride]= av_clip_pixel(dst[i + 1*stride] + ((z1 + z2) >> 6));
  62.         dst[i + 2*stride]= av_clip_pixel(dst[i + 2*stride] + ((z1 - z2) >> 6));
  63.         dst[i + 3*stride]= av_clip_pixel(dst[i + 3*stride] + ((z0 - z3) >> 6));
  64.     }
  65.  
  66.     memset(block, 0, 16 * sizeof(dctcoef));
  67. }
  68.  
  69. void FUNCC(ff_h264_idct8_add)(uint8_t *_dst, int16_t *_block, int stride){
  70.     int i;
  71.     pixel *dst = (pixel*)_dst;
  72.     dctcoef *block = (dctcoef*)_block;
  73.     stride >>= sizeof(pixel)-1;
  74.  
  75.     block[0] += 32;
  76.  
  77.     for( i = 0; i < 8; i++ )
  78.     {
  79.         const int a0 =  block[i+0*8] + block[i+4*8];
  80.         const int a2 =  block[i+0*8] - block[i+4*8];
  81.         const int a4 = (block[i+2*8]>>1) - block[i+6*8];
  82.         const int a6 = (block[i+6*8]>>1) + block[i+2*8];
  83.  
  84.         const int b0 = a0 + a6;
  85.         const int b2 = a2 + a4;
  86.         const int b4 = a2 - a4;
  87.         const int b6 = a0 - a6;
  88.  
  89.         const int a1 = -block[i+3*8] + block[i+5*8] - block[i+7*8] - (block[i+7*8]>>1);
  90.         const int a3 =  block[i+1*8] + block[i+7*8] - block[i+3*8] - (block[i+3*8]>>1);
  91.         const int a5 = -block[i+1*8] + block[i+7*8] + block[i+5*8] + (block[i+5*8]>>1);
  92.         const int a7 =  block[i+3*8] + block[i+5*8] + block[i+1*8] + (block[i+1*8]>>1);
  93.  
  94.         const int b1 = (a7>>2) + a1;
  95.         const int b3 =  a3 + (a5>>2);
  96.         const int b5 = (a3>>2) - a5;
  97.         const int b7 =  a7 - (a1>>2);
  98.  
  99.         block[i+0*8] = b0 + b7;
  100.         block[i+7*8] = b0 - b7;
  101.         block[i+1*8] = b2 + b5;
  102.         block[i+6*8] = b2 - b5;
  103.         block[i+2*8] = b4 + b3;
  104.         block[i+5*8] = b4 - b3;
  105.         block[i+3*8] = b6 + b1;
  106.         block[i+4*8] = b6 - b1;
  107.     }
  108.     for( i = 0; i < 8; i++ )
  109.     {
  110.         const int a0 =  block[0+i*8] + block[4+i*8];
  111.         const int a2 =  block[0+i*8] - block[4+i*8];
  112.         const int a4 = (block[2+i*8]>>1) - block[6+i*8];
  113.         const int a6 = (block[6+i*8]>>1) + block[2+i*8];
  114.  
  115.         const int b0 = a0 + a6;
  116.         const int b2 = a2 + a4;
  117.         const int b4 = a2 - a4;
  118.         const int b6 = a0 - a6;
  119.  
  120.         const int a1 = -block[3+i*8] + block[5+i*8] - block[7+i*8] - (block[7+i*8]>>1);
  121.         const int a3 =  block[1+i*8] + block[7+i*8] - block[3+i*8] - (block[3+i*8]>>1);
  122.         const int a5 = -block[1+i*8] + block[7+i*8] + block[5+i*8] + (block[5+i*8]>>1);
  123.         const int a7 =  block[3+i*8] + block[5+i*8] + block[1+i*8] + (block[1+i*8]>>1);
  124.  
  125.         const int b1 = (a7>>2) + a1;
  126.         const int b3 =  a3 + (a5>>2);
  127.         const int b5 = (a3>>2) - a5;
  128.         const int b7 =  a7 - (a1>>2);
  129.  
  130.         dst[i + 0*stride] = av_clip_pixel( dst[i + 0*stride] + ((b0 + b7) >> 6) );
  131.         dst[i + 1*stride] = av_clip_pixel( dst[i + 1*stride] + ((b2 + b5) >> 6) );
  132.         dst[i + 2*stride] = av_clip_pixel( dst[i + 2*stride] + ((b4 + b3) >> 6) );
  133.         dst[i + 3*stride] = av_clip_pixel( dst[i + 3*stride] + ((b6 + b1) >> 6) );
  134.         dst[i + 4*stride] = av_clip_pixel( dst[i + 4*stride] + ((b6 - b1) >> 6) );
  135.         dst[i + 5*stride] = av_clip_pixel( dst[i + 5*stride] + ((b4 - b3) >> 6) );
  136.         dst[i + 6*stride] = av_clip_pixel( dst[i + 6*stride] + ((b2 - b5) >> 6) );
  137.         dst[i + 7*stride] = av_clip_pixel( dst[i + 7*stride] + ((b0 - b7) >> 6) );
  138.     }
  139.  
  140.     memset(block, 0, 64 * sizeof(dctcoef));
  141. }
  142.  
  143. // assumes all AC coefs are 0
  144. void FUNCC(ff_h264_idct_dc_add)(uint8_t *_dst, int16_t *_block, int stride){
  145.     int i, j;
  146.     pixel *dst = (pixel*)_dst;
  147.     dctcoef *block = (dctcoef*)_block;
  148.     int dc = (block[0] + 32) >> 6;
  149.     stride /= sizeof(pixel);
  150.     block[0] = 0;
  151.     for( j = 0; j < 4; j++ )
  152.     {
  153.         for( i = 0; i < 4; i++ )
  154.             dst[i] = av_clip_pixel( dst[i] + dc );
  155.         dst += stride;
  156.     }
  157. }
  158.  
  159. void FUNCC(ff_h264_idct8_dc_add)(uint8_t *_dst, int16_t *_block, int stride){
  160.     int i, j;
  161.     pixel *dst = (pixel*)_dst;
  162.     dctcoef *block = (dctcoef*)_block;
  163.     int dc = (block[0] + 32) >> 6;
  164.     block[0] = 0;
  165.     stride /= sizeof(pixel);
  166.     for( j = 0; j < 8; j++ )
  167.     {
  168.         for( i = 0; i < 8; i++ )
  169.             dst[i] = av_clip_pixel( dst[i] + dc );
  170.         dst += stride;
  171.     }
  172. }
  173.  
  174. void FUNCC(ff_h264_idct_add16)(uint8_t *dst, const int *block_offset, int16_t *block, int stride, const uint8_t nnzc[15*8]){
  175.     int i;
  176.     for(i=0; i<16; i++){
  177.         int nnz = nnzc[ scan8[i] ];
  178.         if(nnz){
  179.             if(nnz==1 && ((dctcoef*)block)[i*16]) FUNCC(ff_h264_idct_dc_add)(dst + block_offset[i], block + i*16*sizeof(pixel), stride);
  180.             else                                  FUNCC(ff_h264_idct_add   )(dst + block_offset[i], block + i*16*sizeof(pixel), stride);
  181.         }
  182.     }
  183. }
  184.  
  185. void FUNCC(ff_h264_idct_add16intra)(uint8_t *dst, const int *block_offset, int16_t *block, int stride, const uint8_t nnzc[15*8]){
  186.     int i;
  187.     for(i=0; i<16; i++){
  188.         if(nnzc[ scan8[i] ])             FUNCC(ff_h264_idct_add   )(dst + block_offset[i], block + i*16*sizeof(pixel), stride);
  189.         else if(((dctcoef*)block)[i*16]) FUNCC(ff_h264_idct_dc_add)(dst + block_offset[i], block + i*16*sizeof(pixel), stride);
  190.     }
  191. }
  192.  
  193. void FUNCC(ff_h264_idct8_add4)(uint8_t *dst, const int *block_offset, int16_t *block, int stride, const uint8_t nnzc[15*8]){
  194.     int i;
  195.     for(i=0; i<16; i+=4){
  196.         int nnz = nnzc[ scan8[i] ];
  197.         if(nnz){
  198.             if(nnz==1 && ((dctcoef*)block)[i*16]) FUNCC(ff_h264_idct8_dc_add)(dst + block_offset[i], block + i*16*sizeof(pixel), stride);
  199.             else                                  FUNCC(ff_h264_idct8_add   )(dst + block_offset[i], block + i*16*sizeof(pixel), stride);
  200.         }
  201.     }
  202. }
  203.  
  204. void FUNCC(ff_h264_idct_add8)(uint8_t **dest, const int *block_offset, int16_t *block, int stride, const uint8_t nnzc[15*8]){
  205.     int i, j;
  206.     for(j=1; j<3; j++){
  207.         for(i=j*16; i<j*16+4; i++){
  208.             if(nnzc[ scan8[i] ])
  209.                 FUNCC(ff_h264_idct_add   )(dest[j-1] + block_offset[i], block + i*16*sizeof(pixel), stride);
  210.             else if(((dctcoef*)block)[i*16])
  211.                 FUNCC(ff_h264_idct_dc_add)(dest[j-1] + block_offset[i], block + i*16*sizeof(pixel), stride);
  212.         }
  213.     }
  214. }
  215.  
  216. void FUNCC(ff_h264_idct_add8_422)(uint8_t **dest, const int *block_offset, int16_t *block, int stride, const uint8_t nnzc[15*8]){
  217.     int i, j;
  218.  
  219.     for(j=1; j<3; j++){
  220.         for(i=j*16; i<j*16+4; i++){
  221.             if(nnzc[ scan8[i] ])
  222.                 FUNCC(ff_h264_idct_add   )(dest[j-1] + block_offset[i], block + i*16*sizeof(pixel), stride);
  223.             else if(((dctcoef*)block)[i*16])
  224.                 FUNCC(ff_h264_idct_dc_add)(dest[j-1] + block_offset[i], block + i*16*sizeof(pixel), stride);
  225.         }
  226.     }
  227.  
  228.     for(j=1; j<3; j++){
  229.         for(i=j*16+4; i<j*16+8; i++){
  230.             if(nnzc[ scan8[i+4] ])
  231.                 FUNCC(ff_h264_idct_add   )(dest[j-1] + block_offset[i+4], block + i*16*sizeof(pixel), stride);
  232.             else if(((dctcoef*)block)[i*16])
  233.                 FUNCC(ff_h264_idct_dc_add)(dest[j-1] + block_offset[i+4], block + i*16*sizeof(pixel), stride);
  234.         }
  235.     }
  236. }
  237.  
  238. /**
  239.  * IDCT transforms the 16 dc values and dequantizes them.
  240.  * @param qmul quantization parameter
  241.  */
  242. void FUNCC(ff_h264_luma_dc_dequant_idct)(int16_t *_output, int16_t *_input, int qmul){
  243. #define stride 16
  244.     int i;
  245.     int temp[16];
  246.     static const uint8_t x_offset[4]={0, 2*stride, 8*stride, 10*stride};
  247.     dctcoef *input = (dctcoef*)_input;
  248.     dctcoef *output = (dctcoef*)_output;
  249.  
  250.     for(i=0; i<4; i++){
  251.         const int z0= input[4*i+0] + input[4*i+1];
  252.         const int z1= input[4*i+0] - input[4*i+1];
  253.         const int z2= input[4*i+2] - input[4*i+3];
  254.         const int z3= input[4*i+2] + input[4*i+3];
  255.  
  256.         temp[4*i+0]= z0+z3;
  257.         temp[4*i+1]= z0-z3;
  258.         temp[4*i+2]= z1-z2;
  259.         temp[4*i+3]= z1+z2;
  260.     }
  261.  
  262.     for(i=0; i<4; i++){
  263.         const int offset= x_offset[i];
  264.         const int z0= temp[4*0+i] + temp[4*2+i];
  265.         const int z1= temp[4*0+i] - temp[4*2+i];
  266.         const int z2= temp[4*1+i] - temp[4*3+i];
  267.         const int z3= temp[4*1+i] + temp[4*3+i];
  268.  
  269.         output[stride* 0+offset]= ((((z0 + z3)*qmul + 128 ) >> 8));
  270.         output[stride* 1+offset]= ((((z1 + z2)*qmul + 128 ) >> 8));
  271.         output[stride* 4+offset]= ((((z1 - z2)*qmul + 128 ) >> 8));
  272.         output[stride* 5+offset]= ((((z0 - z3)*qmul + 128 ) >> 8));
  273.     }
  274. #undef stride
  275. }
  276.  
  277. void FUNCC(ff_h264_chroma422_dc_dequant_idct)(int16_t *_block, int qmul){
  278.     const int stride= 16*2;
  279.     const int xStride= 16;
  280.     int i;
  281.     int temp[8];
  282.     static const uint8_t x_offset[2]={0, 16};
  283.     dctcoef *block = (dctcoef*)_block;
  284.  
  285.     for(i=0; i<4; i++){
  286.         temp[2*i+0] = block[stride*i + xStride*0] + block[stride*i + xStride*1];
  287.         temp[2*i+1] = block[stride*i + xStride*0] - block[stride*i + xStride*1];
  288.     }
  289.  
  290.     for(i=0; i<2; i++){
  291.         const int offset= x_offset[i];
  292.         const int z0= temp[2*0+i] + temp[2*2+i];
  293.         const int z1= temp[2*0+i] - temp[2*2+i];
  294.         const int z2= temp[2*1+i] - temp[2*3+i];
  295.         const int z3= temp[2*1+i] + temp[2*3+i];
  296.  
  297.         block[stride*0+offset]= ((z0 + z3)*qmul + 128) >> 8;
  298.         block[stride*1+offset]= ((z1 + z2)*qmul + 128) >> 8;
  299.         block[stride*2+offset]= ((z1 - z2)*qmul + 128) >> 8;
  300.         block[stride*3+offset]= ((z0 - z3)*qmul + 128) >> 8;
  301.     }
  302. }
  303.  
  304. void FUNCC(ff_h264_chroma_dc_dequant_idct)(int16_t *_block, int qmul){
  305.     const int stride= 16*2;
  306.     const int xStride= 16;
  307.     int a,b,c,d,e;
  308.     dctcoef *block = (dctcoef*)_block;
  309.  
  310.     a= block[stride*0 + xStride*0];
  311.     b= block[stride*0 + xStride*1];
  312.     c= block[stride*1 + xStride*0];
  313.     d= block[stride*1 + xStride*1];
  314.  
  315.     e= a-b;
  316.     a= a+b;
  317.     b= c-d;
  318.     c= c+d;
  319.  
  320.     block[stride*0 + xStride*0]= ((a+c)*qmul) >> 7;
  321.     block[stride*0 + xStride*1]= ((e+b)*qmul) >> 7;
  322.     block[stride*1 + xStride*0]= ((a-c)*qmul) >> 7;
  323.     block[stride*1 + xStride*1]= ((e-b)*qmul) >> 7;
  324. }
  325.