Libav 0.7.1
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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 "high_bit_depth.h" 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 static av_always_inline void FUNCC(idct_internal)(uint8_t *_dst, DCTELEM *_block, int stride, int block_stride, int shift, int add){ 00050 int i; 00051 INIT_CLIP 00052 pixel *dst = (pixel*)_dst; 00053 dctcoef *block = (dctcoef*)_block; 00054 stride /= sizeof(pixel); 00055 00056 block[0] += 1<<(shift-1); 00057 00058 for(i=0; i<4; i++){ 00059 const int z0= block[i + block_stride*0] + block[i + block_stride*2]; 00060 const int z1= block[i + block_stride*0] - block[i + block_stride*2]; 00061 const int z2= (block[i + block_stride*1]>>1) - block[i + block_stride*3]; 00062 const int z3= block[i + block_stride*1] + (block[i + block_stride*3]>>1); 00063 00064 block[i + block_stride*0]= z0 + z3; 00065 block[i + block_stride*1]= z1 + z2; 00066 block[i + block_stride*2]= z1 - z2; 00067 block[i + block_stride*3]= z0 - z3; 00068 } 00069 00070 for(i=0; i<4; i++){ 00071 const int z0= block[0 + block_stride*i] + block[2 + block_stride*i]; 00072 const int z1= block[0 + block_stride*i] - block[2 + block_stride*i]; 00073 const int z2= (block[1 + block_stride*i]>>1) - block[3 + block_stride*i]; 00074 const int z3= block[1 + block_stride*i] + (block[3 + block_stride*i]>>1); 00075 00076 dst[i + 0*stride]= CLIP(add*dst[i + 0*stride] + ((z0 + z3) >> shift)); 00077 dst[i + 1*stride]= CLIP(add*dst[i + 1*stride] + ((z1 + z2) >> shift)); 00078 dst[i + 2*stride]= CLIP(add*dst[i + 2*stride] + ((z1 - z2) >> shift)); 00079 dst[i + 3*stride]= CLIP(add*dst[i + 3*stride] + ((z0 - z3) >> shift)); 00080 } 00081 } 00082 00083 void FUNCC(ff_h264_idct_add)(uint8_t *dst, DCTELEM *block, int stride){ 00084 FUNCC(idct_internal)(dst, block, stride, 4, 6, 1); 00085 } 00086 00087 void FUNCC(ff_h264_lowres_idct_add)(uint8_t *dst, int stride, DCTELEM *block){ 00088 FUNCC(idct_internal)(dst, block, stride, 8, 3, 1); 00089 } 00090 00091 void FUNCC(ff_h264_lowres_idct_put)(uint8_t *dst, int stride, DCTELEM *block){ 00092 FUNCC(idct_internal)(dst, block, stride, 8, 3, 0); 00093 } 00094 00095 void FUNCC(ff_h264_idct8_add)(uint8_t *_dst, DCTELEM *_block, int stride){ 00096 int i; 00097 INIT_CLIP 00098 pixel *dst = (pixel*)_dst; 00099 dctcoef *block = (dctcoef*)_block; 00100 stride /= sizeof(pixel); 00101 00102 block[0] += 32; 00103 00104 for( i = 0; i < 8; i++ ) 00105 { 00106 const int a0 = block[i+0*8] + block[i+4*8]; 00107 const int a2 = block[i+0*8] - block[i+4*8]; 00108 const int a4 = (block[i+2*8]>>1) - block[i+6*8]; 00109 const int a6 = (block[i+6*8]>>1) + block[i+2*8]; 00110 00111 const int b0 = a0 + a6; 00112 const int b2 = a2 + a4; 00113 const int b4 = a2 - a4; 00114 const int b6 = a0 - a6; 00115 00116 const int a1 = -block[i+3*8] + block[i+5*8] - block[i+7*8] - (block[i+7*8]>>1); 00117 const int a3 = block[i+1*8] + block[i+7*8] - block[i+3*8] - (block[i+3*8]>>1); 00118 const int a5 = -block[i+1*8] + block[i+7*8] + block[i+5*8] + (block[i+5*8]>>1); 00119 const int a7 = block[i+3*8] + block[i+5*8] + block[i+1*8] + (block[i+1*8]>>1); 00120 00121 const int b1 = (a7>>2) + a1; 00122 const int b3 = a3 + (a5>>2); 00123 const int b5 = (a3>>2) - a5; 00124 const int b7 = a7 - (a1>>2); 00125 00126 block[i+0*8] = b0 + b7; 00127 block[i+7*8] = b0 - b7; 00128 block[i+1*8] = b2 + b5; 00129 block[i+6*8] = b2 - b5; 00130 block[i+2*8] = b4 + b3; 00131 block[i+5*8] = b4 - b3; 00132 block[i+3*8] = b6 + b1; 00133 block[i+4*8] = b6 - b1; 00134 } 00135 for( i = 0; i < 8; i++ ) 00136 { 00137 const int a0 = block[0+i*8] + block[4+i*8]; 00138 const int a2 = block[0+i*8] - block[4+i*8]; 00139 const int a4 = (block[2+i*8]>>1) - block[6+i*8]; 00140 const int a6 = (block[6+i*8]>>1) + block[2+i*8]; 00141 00142 const int b0 = a0 + a6; 00143 const int b2 = a2 + a4; 00144 const int b4 = a2 - a4; 00145 const int b6 = a0 - a6; 00146 00147 const int a1 = -block[3+i*8] + block[5+i*8] - block[7+i*8] - (block[7+i*8]>>1); 00148 const int a3 = block[1+i*8] + block[7+i*8] - block[3+i*8] - (block[3+i*8]>>1); 00149 const int a5 = -block[1+i*8] + block[7+i*8] + block[5+i*8] + (block[5+i*8]>>1); 00150 const int a7 = block[3+i*8] + block[5+i*8] + block[1+i*8] + (block[1+i*8]>>1); 00151 00152 const int b1 = (a7>>2) + a1; 00153 const int b3 = a3 + (a5>>2); 00154 const int b5 = (a3>>2) - a5; 00155 const int b7 = a7 - (a1>>2); 00156 00157 dst[i + 0*stride] = CLIP( dst[i + 0*stride] + ((b0 + b7) >> 6) ); 00158 dst[i + 1*stride] = CLIP( dst[i + 1*stride] + ((b2 + b5) >> 6) ); 00159 dst[i + 2*stride] = CLIP( dst[i + 2*stride] + ((b4 + b3) >> 6) ); 00160 dst[i + 3*stride] = CLIP( dst[i + 3*stride] + ((b6 + b1) >> 6) ); 00161 dst[i + 4*stride] = CLIP( dst[i + 4*stride] + ((b6 - b1) >> 6) ); 00162 dst[i + 5*stride] = CLIP( dst[i + 5*stride] + ((b4 - b3) >> 6) ); 00163 dst[i + 6*stride] = CLIP( dst[i + 6*stride] + ((b2 - b5) >> 6) ); 00164 dst[i + 7*stride] = CLIP( dst[i + 7*stride] + ((b0 - b7) >> 6) ); 00165 } 00166 } 00167 00168 // assumes all AC coefs are 0 00169 void FUNCC(ff_h264_idct_dc_add)(uint8_t *_dst, DCTELEM *block, int stride){ 00170 int i, j; 00171 int dc = (((dctcoef*)block)[0] + 32) >> 6; 00172 INIT_CLIP 00173 pixel *dst = (pixel*)_dst; 00174 stride /= sizeof(pixel); 00175 for( j = 0; j < 4; j++ ) 00176 { 00177 for( i = 0; i < 4; i++ ) 00178 dst[i] = CLIP( dst[i] + dc ); 00179 dst += stride; 00180 } 00181 } 00182 00183 void FUNCC(ff_h264_idct8_dc_add)(uint8_t *_dst, DCTELEM *block, int stride){ 00184 int i, j; 00185 int dc = (((dctcoef*)block)[0] + 32) >> 6; 00186 INIT_CLIP 00187 pixel *dst = (pixel*)_dst; 00188 stride /= sizeof(pixel); 00189 for( j = 0; j < 8; j++ ) 00190 { 00191 for( i = 0; i < 8; i++ ) 00192 dst[i] = CLIP( dst[i] + dc ); 00193 dst += stride; 00194 } 00195 } 00196 00197 void FUNCC(ff_h264_idct_add16)(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 int nnz = nnzc[ scan8[i] ]; 00201 if(nnz){ 00202 if(nnz==1 && ((dctcoef*)block)[i*16]) FUNCC(ff_h264_idct_dc_add)(dst + block_offset[i], block + i*16*sizeof(pixel), stride); 00203 else FUNCC(idct_internal )(dst + block_offset[i], block + i*16*sizeof(pixel), stride, 4, 6, 1); 00204 } 00205 } 00206 } 00207 00208 void FUNCC(ff_h264_idct_add16intra)(uint8_t *dst, const int *block_offset, DCTELEM *block, int stride, const uint8_t nnzc[15*8]){ 00209 int i; 00210 for(i=0; i<16; i++){ 00211 if(nnzc[ scan8[i] ]) FUNCC(idct_internal )(dst + block_offset[i], block + i*16*sizeof(pixel), stride, 4, 6, 1); 00212 else if(((dctcoef*)block)[i*16]) FUNCC(ff_h264_idct_dc_add)(dst + block_offset[i], block + i*16*sizeof(pixel), stride); 00213 } 00214 } 00215 00216 void FUNCC(ff_h264_idct8_add4)(uint8_t *dst, const int *block_offset, DCTELEM *block, int stride, const uint8_t nnzc[15*8]){ 00217 int i; 00218 for(i=0; i<16; i+=4){ 00219 int nnz = nnzc[ scan8[i] ]; 00220 if(nnz){ 00221 if(nnz==1 && ((dctcoef*)block)[i*16]) FUNCC(ff_h264_idct8_dc_add)(dst + block_offset[i], block + i*16*sizeof(pixel), stride); 00222 else FUNCC(ff_h264_idct8_add )(dst + block_offset[i], block + i*16*sizeof(pixel), stride); 00223 } 00224 } 00225 } 00226 00227 void FUNCC(ff_h264_idct_add8)(uint8_t **dest, const int *block_offset, DCTELEM *block, int stride, const uint8_t nnzc[15*8]){ 00228 int i, j; 00229 for(j=1; j<3; j++){ 00230 for(i=j*16; i<j*16+4; i++){ 00231 if(nnzc[ scan8[i] ]) 00232 FUNCC(ff_h264_idct_add )(dest[j-1] + block_offset[i], block + i*16*sizeof(pixel), stride); 00233 else if(((dctcoef*)block)[i*16]) 00234 FUNCC(ff_h264_idct_dc_add)(dest[j-1] + block_offset[i], block + i*16*sizeof(pixel), stride); 00235 } 00236 } 00237 } 00241 void FUNCC(ff_h264_luma_dc_dequant_idct)(DCTELEM *_output, DCTELEM *_input, int qmul){ 00242 #define stride 16 00243 int i; 00244 int temp[16]; 00245 static const uint8_t x_offset[4]={0, 2*stride, 8*stride, 10*stride}; 00246 dctcoef *input = (dctcoef*)_input; 00247 dctcoef *output = (dctcoef*)_output; 00248 00249 for(i=0; i<4; i++){ 00250 const int z0= input[4*i+0] + input[4*i+1]; 00251 const int z1= input[4*i+0] - input[4*i+1]; 00252 const int z2= input[4*i+2] - input[4*i+3]; 00253 const int z3= input[4*i+2] + input[4*i+3]; 00254 00255 temp[4*i+0]= z0+z3; 00256 temp[4*i+1]= z0-z3; 00257 temp[4*i+2]= z1-z2; 00258 temp[4*i+3]= z1+z2; 00259 } 00260 00261 for(i=0; i<4; i++){ 00262 const int offset= x_offset[i]; 00263 const int z0= temp[4*0+i] + temp[4*2+i]; 00264 const int z1= temp[4*0+i] - temp[4*2+i]; 00265 const int z2= temp[4*1+i] - temp[4*3+i]; 00266 const int z3= temp[4*1+i] + temp[4*3+i]; 00267 00268 output[stride* 0+offset]= ((((z0 + z3)*qmul + 128 ) >> 8)); 00269 output[stride* 1+offset]= ((((z1 + z2)*qmul + 128 ) >> 8)); 00270 output[stride* 4+offset]= ((((z1 - z2)*qmul + 128 ) >> 8)); 00271 output[stride* 5+offset]= ((((z0 - z3)*qmul + 128 ) >> 8)); 00272 } 00273 #undef stride 00274 } 00275 00276 void FUNCC(ff_h264_chroma_dc_dequant_idct)(DCTELEM *_block, int qmul){ 00277 const int stride= 16*2; 00278 const int xStride= 16; 00279 int a,b,c,d,e; 00280 dctcoef *block = (dctcoef*)_block; 00281 00282 a= block[stride*0 + xStride*0]; 00283 b= block[stride*0 + xStride*1]; 00284 c= block[stride*1 + xStride*0]; 00285 d= block[stride*1 + xStride*1]; 00286 00287 e= a-b; 00288 a= a+b; 00289 b= c-d; 00290 c= c+d; 00291 00292 block[stride*0 + xStride*0]= ((a+c)*qmul) >> 7; 00293 block[stride*0 + xStride*1]= ((e+b)*qmul) >> 7; 00294 block[stride*1 + xStride*0]= ((a-c)*qmul) >> 7; 00295 block[stride*1 + xStride*1]= ((e-b)*qmul) >> 7; 00296 }