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libavcodec/h264idct_template.c

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00001 /*
00002  * H.264 IDCT
00003  * Copyright (c) 2004-2011 Michael Niedermayer <michaelni@gmx.at>
00004  *
00005  * This file is part of Libav.
00006  *
00007  * Libav is free software; you can redistribute it and/or
00008  * modify it under the terms of the GNU Lesser General Public
00009  * License as published by the Free Software Foundation; either
00010  * version 2.1 of the License, or (at your option) any later version.
00011  *
00012  * Libav is distributed in the hope that it will be useful,
00013  * but WITHOUT ANY WARRANTY; without even the implied warranty of
00014  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00015  * Lesser General Public License for more details.
00016  *
00017  * You should have received a copy of the GNU Lesser General Public
00018  * License along with Libav; if not, write to the Free Software
00019  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
00020  */
00021 
00028 #include "bit_depth_template.c"
00029 
00030 #ifndef AVCODEC_H264IDCT_INTERNAL_H
00031 #define AVCODEC_H264IDCT_INTERNAL_H
00032 //FIXME this table is a duplicate from h264data.h, and will be removed once the tables from, h264 have been split
00033 static const uint8_t scan8[16*3]={
00034  4+ 1*8, 5+ 1*8, 4+ 2*8, 5+ 2*8,
00035  6+ 1*8, 7+ 1*8, 6+ 2*8, 7+ 2*8,
00036  4+ 3*8, 5+ 3*8, 4+ 4*8, 5+ 4*8,
00037  6+ 3*8, 7+ 3*8, 6+ 4*8, 7+ 4*8,
00038  4+ 6*8, 5+ 6*8, 4+ 7*8, 5+ 7*8,
00039  6+ 6*8, 7+ 6*8, 6+ 7*8, 7+ 7*8,
00040  4+ 8*8, 5+ 8*8, 4+ 9*8, 5+ 9*8,
00041  6+ 8*8, 7+ 8*8, 6+ 9*8, 7+ 9*8,
00042  4+11*8, 5+11*8, 4+12*8, 5+12*8,
00043  6+11*8, 7+11*8, 6+12*8, 7+12*8,
00044  4+13*8, 5+13*8, 4+14*8, 5+14*8,
00045  6+13*8, 7+13*8, 6+14*8, 7+14*8
00046 };
00047 #endif
00048 
00049 void FUNCC(ff_h264_idct_add)(uint8_t *_dst, DCTELEM *_block, int stride)
00050 {
00051     int i;
00052     INIT_CLIP
00053     pixel *dst = (pixel*)_dst;
00054     dctcoef *block = (dctcoef*)_block;
00055     stride /= sizeof(pixel);
00056 
00057     block[0] += 1 << 5;
00058 
00059     for(i=0; i<4; i++){
00060         const int z0=  block[i + 4*0]     +  block[i + 4*2];
00061         const int z1=  block[i + 4*0]     -  block[i + 4*2];
00062         const int z2= (block[i + 4*1]>>1) -  block[i + 4*3];
00063         const int z3=  block[i + 4*1]     + (block[i + 4*3]>>1);
00064 
00065         block[i + 4*0]= z0 + z3;
00066         block[i + 4*1]= z1 + z2;
00067         block[i + 4*2]= z1 - z2;
00068         block[i + 4*3]= z0 - z3;
00069     }
00070 
00071     for(i=0; i<4; i++){
00072         const int z0=  block[0 + 4*i]     +  block[2 + 4*i];
00073         const int z1=  block[0 + 4*i]     -  block[2 + 4*i];
00074         const int z2= (block[1 + 4*i]>>1) -  block[3 + 4*i];
00075         const int z3=  block[1 + 4*i]     + (block[3 + 4*i]>>1);
00076 
00077         dst[i + 0*stride]= CLIP(dst[i + 0*stride] + ((z0 + z3) >> 6));
00078         dst[i + 1*stride]= CLIP(dst[i + 1*stride] + ((z1 + z2) >> 6));
00079         dst[i + 2*stride]= CLIP(dst[i + 2*stride] + ((z1 - z2) >> 6));
00080         dst[i + 3*stride]= CLIP(dst[i + 3*stride] + ((z0 - z3) >> 6));
00081     }
00082 }
00083 
00084 void FUNCC(ff_h264_idct8_add)(uint8_t *_dst, DCTELEM *_block, int stride){
00085     int i;
00086     INIT_CLIP
00087     pixel *dst = (pixel*)_dst;
00088     dctcoef *block = (dctcoef*)_block;
00089     stride /= sizeof(pixel);
00090 
00091     block[0] += 32;
00092 
00093     for( i = 0; i < 8; i++ )
00094     {
00095         const int a0 =  block[i+0*8] + block[i+4*8];
00096         const int a2 =  block[i+0*8] - block[i+4*8];
00097         const int a4 = (block[i+2*8]>>1) - block[i+6*8];
00098         const int a6 = (block[i+6*8]>>1) + block[i+2*8];
00099 
00100         const int b0 = a0 + a6;
00101         const int b2 = a2 + a4;
00102         const int b4 = a2 - a4;
00103         const int b6 = a0 - a6;
00104 
00105         const int a1 = -block[i+3*8] + block[i+5*8] - block[i+7*8] - (block[i+7*8]>>1);
00106         const int a3 =  block[i+1*8] + block[i+7*8] - block[i+3*8] - (block[i+3*8]>>1);
00107         const int a5 = -block[i+1*8] + block[i+7*8] + block[i+5*8] + (block[i+5*8]>>1);
00108         const int a7 =  block[i+3*8] + block[i+5*8] + block[i+1*8] + (block[i+1*8]>>1);
00109 
00110         const int b1 = (a7>>2) + a1;
00111         const int b3 =  a3 + (a5>>2);
00112         const int b5 = (a3>>2) - a5;
00113         const int b7 =  a7 - (a1>>2);
00114 
00115         block[i+0*8] = b0 + b7;
00116         block[i+7*8] = b0 - b7;
00117         block[i+1*8] = b2 + b5;
00118         block[i+6*8] = b2 - b5;
00119         block[i+2*8] = b4 + b3;
00120         block[i+5*8] = b4 - b3;
00121         block[i+3*8] = b6 + b1;
00122         block[i+4*8] = b6 - b1;
00123     }
00124     for( i = 0; i < 8; i++ )
00125     {
00126         const int a0 =  block[0+i*8] + block[4+i*8];
00127         const int a2 =  block[0+i*8] - block[4+i*8];
00128         const int a4 = (block[2+i*8]>>1) - block[6+i*8];
00129         const int a6 = (block[6+i*8]>>1) + block[2+i*8];
00130 
00131         const int b0 = a0 + a6;
00132         const int b2 = a2 + a4;
00133         const int b4 = a2 - a4;
00134         const int b6 = a0 - a6;
00135 
00136         const int a1 = -block[3+i*8] + block[5+i*8] - block[7+i*8] - (block[7+i*8]>>1);
00137         const int a3 =  block[1+i*8] + block[7+i*8] - block[3+i*8] - (block[3+i*8]>>1);
00138         const int a5 = -block[1+i*8] + block[7+i*8] + block[5+i*8] + (block[5+i*8]>>1);
00139         const int a7 =  block[3+i*8] + block[5+i*8] + block[1+i*8] + (block[1+i*8]>>1);
00140 
00141         const int b1 = (a7>>2) + a1;
00142         const int b3 =  a3 + (a5>>2);
00143         const int b5 = (a3>>2) - a5;
00144         const int b7 =  a7 - (a1>>2);
00145 
00146         dst[i + 0*stride] = CLIP( dst[i + 0*stride] + ((b0 + b7) >> 6) );
00147         dst[i + 1*stride] = CLIP( dst[i + 1*stride] + ((b2 + b5) >> 6) );
00148         dst[i + 2*stride] = CLIP( dst[i + 2*stride] + ((b4 + b3) >> 6) );
00149         dst[i + 3*stride] = CLIP( dst[i + 3*stride] + ((b6 + b1) >> 6) );
00150         dst[i + 4*stride] = CLIP( dst[i + 4*stride] + ((b6 - b1) >> 6) );
00151         dst[i + 5*stride] = CLIP( dst[i + 5*stride] + ((b4 - b3) >> 6) );
00152         dst[i + 6*stride] = CLIP( dst[i + 6*stride] + ((b2 - b5) >> 6) );
00153         dst[i + 7*stride] = CLIP( dst[i + 7*stride] + ((b0 - b7) >> 6) );
00154     }
00155 }
00156 
00157 // assumes all AC coefs are 0
00158 void FUNCC(ff_h264_idct_dc_add)(uint8_t *_dst, DCTELEM *block, int stride){
00159     int i, j;
00160     int dc = (((dctcoef*)block)[0] + 32) >> 6;
00161     INIT_CLIP
00162     pixel *dst = (pixel*)_dst;
00163     stride /= sizeof(pixel);
00164     for( j = 0; j < 4; j++ )
00165     {
00166         for( i = 0; i < 4; i++ )
00167             dst[i] = CLIP( dst[i] + dc );
00168         dst += stride;
00169     }
00170 }
00171 
00172 void FUNCC(ff_h264_idct8_dc_add)(uint8_t *_dst, DCTELEM *block, int stride){
00173     int i, j;
00174     int dc = (((dctcoef*)block)[0] + 32) >> 6;
00175     INIT_CLIP
00176     pixel *dst = (pixel*)_dst;
00177     stride /= sizeof(pixel);
00178     for( j = 0; j < 8; j++ )
00179     {
00180         for( i = 0; i < 8; i++ )
00181             dst[i] = CLIP( dst[i] + dc );
00182         dst += stride;
00183     }
00184 }
00185 
00186 void FUNCC(ff_h264_idct_add16)(uint8_t *dst, const int *block_offset, DCTELEM *block, int stride, const uint8_t nnzc[15*8]){
00187     int i;
00188     for(i=0; i<16; i++){
00189         int nnz = nnzc[ scan8[i] ];
00190         if(nnz){
00191             if(nnz==1 && ((dctcoef*)block)[i*16]) FUNCC(ff_h264_idct_dc_add)(dst + block_offset[i], block + i*16*sizeof(pixel), stride);
00192             else                                  FUNCC(ff_h264_idct_add   )(dst + block_offset[i], block + i*16*sizeof(pixel), stride);
00193         }
00194     }
00195 }
00196 
00197 void FUNCC(ff_h264_idct_add16intra)(uint8_t *dst, const int *block_offset, DCTELEM *block, int stride, const uint8_t nnzc[15*8]){
00198     int i;
00199     for(i=0; i<16; i++){
00200         if(nnzc[ scan8[i] ])             FUNCC(ff_h264_idct_add   )(dst + block_offset[i], block + i*16*sizeof(pixel), stride);
00201         else if(((dctcoef*)block)[i*16]) FUNCC(ff_h264_idct_dc_add)(dst + block_offset[i], block + i*16*sizeof(pixel), stride);
00202     }
00203 }
00204 
00205 void FUNCC(ff_h264_idct8_add4)(uint8_t *dst, const int *block_offset, DCTELEM *block, int stride, const uint8_t nnzc[15*8]){
00206     int i;
00207     for(i=0; i<16; i+=4){
00208         int nnz = nnzc[ scan8[i] ];
00209         if(nnz){
00210             if(nnz==1 && ((dctcoef*)block)[i*16]) FUNCC(ff_h264_idct8_dc_add)(dst + block_offset[i], block + i*16*sizeof(pixel), stride);
00211             else                                  FUNCC(ff_h264_idct8_add   )(dst + block_offset[i], block + i*16*sizeof(pixel), stride);
00212         }
00213     }
00214 }
00215 
00216 void FUNCC(ff_h264_idct_add8)(uint8_t **dest, const int *block_offset, DCTELEM *block, int stride, const uint8_t nnzc[15*8]){
00217     int i, j;
00218     for(j=1; j<3; j++){
00219         for(i=j*16; i<j*16+4; i++){
00220             if(nnzc[ scan8[i] ])
00221                 FUNCC(ff_h264_idct_add   )(dest[j-1] + block_offset[i], block + i*16*sizeof(pixel), stride);
00222             else if(((dctcoef*)block)[i*16])
00223                 FUNCC(ff_h264_idct_dc_add)(dest[j-1] + block_offset[i], block + i*16*sizeof(pixel), stride);
00224         }
00225     }
00226 }
00227 
00228 void FUNCC(ff_h264_idct_add8_422)(uint8_t **dest, const int *block_offset, DCTELEM *block, int stride, const uint8_t nnzc[15*8]){
00229     int i, j;
00230 
00231     for(j=1; j<3; j++){
00232         for(i=j*16; i<j*16+4; i++){
00233             if(nnzc[ scan8[i] ])
00234                 FUNCC(ff_h264_idct_add   )(dest[j-1] + block_offset[i], block + i*16*sizeof(pixel), stride);
00235             else if(((dctcoef*)block)[i*16])
00236                 FUNCC(ff_h264_idct_dc_add)(dest[j-1] + block_offset[i], block + i*16*sizeof(pixel), stride);
00237         }
00238     }
00239 
00240     for(j=1; j<3; j++){
00241         for(i=j*16+4; i<j*16+8; i++){
00242             if(nnzc[ scan8[i+4] ])
00243                 FUNCC(ff_h264_idct_add   )(dest[j-1] + block_offset[i+4], block + i*16*sizeof(pixel), stride);
00244             else if(((dctcoef*)block)[i*16])
00245                 FUNCC(ff_h264_idct_dc_add)(dest[j-1] + block_offset[i+4], block + i*16*sizeof(pixel), stride);
00246         }
00247     }
00248 }
00249 
00254 void FUNCC(ff_h264_luma_dc_dequant_idct)(DCTELEM *_output, DCTELEM *_input, int qmul){
00255 #define stride 16
00256     int i;
00257     int temp[16];
00258     static const uint8_t x_offset[4]={0, 2*stride, 8*stride, 10*stride};
00259     dctcoef *input = (dctcoef*)_input;
00260     dctcoef *output = (dctcoef*)_output;
00261 
00262     for(i=0; i<4; i++){
00263         const int z0= input[4*i+0] + input[4*i+1];
00264         const int z1= input[4*i+0] - input[4*i+1];
00265         const int z2= input[4*i+2] - input[4*i+3];
00266         const int z3= input[4*i+2] + input[4*i+3];
00267 
00268         temp[4*i+0]= z0+z3;
00269         temp[4*i+1]= z0-z3;
00270         temp[4*i+2]= z1-z2;
00271         temp[4*i+3]= z1+z2;
00272     }
00273 
00274     for(i=0; i<4; i++){
00275         const int offset= x_offset[i];
00276         const int z0= temp[4*0+i] + temp[4*2+i];
00277         const int z1= temp[4*0+i] - temp[4*2+i];
00278         const int z2= temp[4*1+i] - temp[4*3+i];
00279         const int z3= temp[4*1+i] + temp[4*3+i];
00280 
00281         output[stride* 0+offset]= ((((z0 + z3)*qmul + 128 ) >> 8));
00282         output[stride* 1+offset]= ((((z1 + z2)*qmul + 128 ) >> 8));
00283         output[stride* 4+offset]= ((((z1 - z2)*qmul + 128 ) >> 8));
00284         output[stride* 5+offset]= ((((z0 - z3)*qmul + 128 ) >> 8));
00285     }
00286 #undef stride
00287 }
00288 
00289 void FUNCC(ff_h264_chroma422_dc_dequant_idct)(DCTELEM *_block, int qmul){
00290     const int stride= 16*2;
00291     const int xStride= 16;
00292     int i;
00293     int temp[8];
00294     static const uint8_t x_offset[2]={0, 16};
00295     dctcoef *block = (dctcoef*)_block;
00296 
00297     for(i=0; i<4; i++){
00298         temp[2*i+0] = block[stride*i + xStride*0] + block[stride*i + xStride*1];
00299         temp[2*i+1] = block[stride*i + xStride*0] - block[stride*i + xStride*1];
00300     }
00301 
00302     for(i=0; i<2; i++){
00303         const int offset= x_offset[i];
00304         const int z0= temp[2*0+i] + temp[2*2+i];
00305         const int z1= temp[2*0+i] - temp[2*2+i];
00306         const int z2= temp[2*1+i] - temp[2*3+i];
00307         const int z3= temp[2*1+i] + temp[2*3+i];
00308 
00309         block[stride*0+offset]= ((z0 + z3)*qmul + 128) >> 8;
00310         block[stride*1+offset]= ((z1 + z2)*qmul + 128) >> 8;
00311         block[stride*2+offset]= ((z1 - z2)*qmul + 128) >> 8;
00312         block[stride*3+offset]= ((z0 - z3)*qmul + 128) >> 8;
00313     }
00314 }
00315 
00316 void FUNCC(ff_h264_chroma_dc_dequant_idct)(DCTELEM *_block, int qmul){
00317     const int stride= 16*2;
00318     const int xStride= 16;
00319     int a,b,c,d,e;
00320     dctcoef *block = (dctcoef*)_block;
00321 
00322     a= block[stride*0 + xStride*0];
00323     b= block[stride*0 + xStride*1];
00324     c= block[stride*1 + xStride*0];
00325     d= block[stride*1 + xStride*1];
00326 
00327     e= a-b;
00328     a= a+b;
00329     b= c-d;
00330     c= c+d;
00331 
00332     block[stride*0 + xStride*0]= ((a+c)*qmul) >> 7;
00333     block[stride*0 + xStride*1]= ((e+b)*qmul) >> 7;
00334     block[stride*1 + xStride*0]= ((a-c)*qmul) >> 7;
00335     block[stride*1 + xStride*1]= ((e-b)*qmul) >> 7;
00336 }
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