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