1/* 2 * H.264 IDCT 3 * Copyright (c) 2004-2011 Michael Niedermayer <michaelni@gmx.at> 4 * 5 * This file is part of Libav. 6 * 7 * Libav 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 * Libav 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 Libav; 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 30#ifndef AVCODEC_H264IDCT_INTERNAL_H 31#define AVCODEC_H264IDCT_INTERNAL_H 32//FIXME this table is a duplicate from h264data.h, and will be removed once the tables from, h264 have been split 33static const uint8_t scan8[16*3]={ 34 4+ 1*8, 5+ 1*8, 4+ 2*8, 5+ 2*8, 35 6+ 1*8, 7+ 1*8, 6+ 2*8, 7+ 2*8, 36 4+ 3*8, 5+ 3*8, 4+ 4*8, 5+ 4*8, 37 6+ 3*8, 7+ 3*8, 6+ 4*8, 7+ 4*8, 38 4+ 6*8, 5+ 6*8, 4+ 7*8, 5+ 7*8, 39 6+ 6*8, 7+ 6*8, 6+ 7*8, 7+ 7*8, 40 4+ 8*8, 5+ 8*8, 4+ 9*8, 5+ 9*8, 41 6+ 8*8, 7+ 8*8, 6+ 9*8, 7+ 9*8, 42 4+11*8, 5+11*8, 4+12*8, 5+12*8, 43 6+11*8, 7+11*8, 6+12*8, 7+12*8, 44 4+13*8, 5+13*8, 4+14*8, 5+14*8, 45 6+13*8, 7+13*8, 6+14*8, 7+14*8 46}; 47#endif 48 49void FUNCC(ff_h264_idct_add)(uint8_t *_dst, DCTELEM *_block, int stride) 50{ 51 int i; 52 pixel *dst = (pixel*)_dst; 53 dctcoef *block = (dctcoef*)_block; 54 stride /= sizeof(pixel); 55 56 block[0] += 1 << 5; 57 58 for(i=0; i<4; i++){ 59 const int z0= block[i + 4*0] + block[i + 4*2]; 60 const int z1= block[i + 4*0] - block[i + 4*2]; 61 const int z2= (block[i + 4*1]>>1) - block[i + 4*3]; 62 const int z3= block[i + 4*1] + (block[i + 4*3]>>1); 63 64 block[i + 4*0]= z0 + z3; 65 block[i + 4*1]= z1 + z2; 66 block[i + 4*2]= z1 - z2; 67 block[i + 4*3]= z0 - z3; 68 } 69 70 for(i=0; i<4; i++){ 71 const int z0= block[0 + 4*i] + block[2 + 4*i]; 72 const int z1= block[0 + 4*i] - block[2 + 4*i]; 73 const int z2= (block[1 + 4*i]>>1) - block[3 + 4*i]; 74 const int z3= block[1 + 4*i] + (block[3 + 4*i]>>1); 75 76 dst[i + 0*stride]= av_clip_pixel(dst[i + 0*stride] + ((z0 + z3) >> 6)); 77 dst[i + 1*stride]= av_clip_pixel(dst[i + 1*stride] + ((z1 + z2) >> 6)); 78 dst[i + 2*stride]= av_clip_pixel(dst[i + 2*stride] + ((z1 - z2) >> 6)); 79 dst[i + 3*stride]= av_clip_pixel(dst[i + 3*stride] + ((z0 - z3) >> 6)); 80 } 81} 82 83void FUNCC(ff_h264_idct8_add)(uint8_t *_dst, DCTELEM *_block, int stride){ 84 int i; 85 pixel *dst = (pixel*)_dst; 86 dctcoef *block = (dctcoef*)_block; 87 stride /= sizeof(pixel); 88 89 block[0] += 32; 90 91 for( i = 0; i < 8; i++ ) 92 { 93 const int a0 = block[i+0*8] + block[i+4*8]; 94 const int a2 = block[i+0*8] - block[i+4*8]; 95 const int a4 = (block[i+2*8]>>1) - block[i+6*8]; 96 const int a6 = (block[i+6*8]>>1) + block[i+2*8]; 97 98 const int b0 = a0 + a6; 99 const int b2 = a2 + a4; 100 const int b4 = a2 - a4; 101 const int b6 = a0 - a6; 102 103 const int a1 = -block[i+3*8] + block[i+5*8] - block[i+7*8] - (block[i+7*8]>>1); 104 const int a3 = block[i+1*8] + block[i+7*8] - block[i+3*8] - (block[i+3*8]>>1); 105 const int a5 = -block[i+1*8] + block[i+7*8] + block[i+5*8] + (block[i+5*8]>>1); 106 const int a7 = block[i+3*8] + block[i+5*8] + block[i+1*8] + (block[i+1*8]>>1); 107 108 const int b1 = (a7>>2) + a1; 109 const int b3 = a3 + (a5>>2); 110 const int b5 = (a3>>2) - a5; 111 const int b7 = a7 - (a1>>2); 112 113 block[i+0*8] = b0 + b7; 114 block[i+7*8] = b0 - b7; 115 block[i+1*8] = b2 + b5; 116 block[i+6*8] = b2 - b5; 117 block[i+2*8] = b4 + b3; 118 block[i+5*8] = b4 - b3; 119 block[i+3*8] = b6 + b1; 120 block[i+4*8] = b6 - b1; 121 } 122 for( i = 0; i < 8; i++ ) 123 { 124 const int a0 = block[0+i*8] + block[4+i*8]; 125 const int a2 = block[0+i*8] - block[4+i*8]; 126 const int a4 = (block[2+i*8]>>1) - block[6+i*8]; 127 const int a6 = (block[6+i*8]>>1) + block[2+i*8]; 128 129 const int b0 = a0 + a6; 130 const int b2 = a2 + a4; 131 const int b4 = a2 - a4; 132 const int b6 = a0 - a6; 133 134 const int a1 = -block[3+i*8] + block[5+i*8] - block[7+i*8] - (block[7+i*8]>>1); 135 const int a3 = block[1+i*8] + block[7+i*8] - block[3+i*8] - (block[3+i*8]>>1); 136 const int a5 = -block[1+i*8] + block[7+i*8] + block[5+i*8] + (block[5+i*8]>>1); 137 const int a7 = block[3+i*8] + block[5+i*8] + block[1+i*8] + (block[1+i*8]>>1); 138 139 const int b1 = (a7>>2) + a1; 140 const int b3 = a3 + (a5>>2); 141 const int b5 = (a3>>2) - a5; 142 const int b7 = a7 - (a1>>2); 143 144 dst[i + 0*stride] = av_clip_pixel( dst[i + 0*stride] + ((b0 + b7) >> 6) ); 145 dst[i + 1*stride] = av_clip_pixel( dst[i + 1*stride] + ((b2 + b5) >> 6) ); 146 dst[i + 2*stride] = av_clip_pixel( dst[i + 2*stride] + ((b4 + b3) >> 6) ); 147 dst[i + 3*stride] = av_clip_pixel( dst[i + 3*stride] + ((b6 + b1) >> 6) ); 148 dst[i + 4*stride] = av_clip_pixel( dst[i + 4*stride] + ((b6 - b1) >> 6) ); 149 dst[i + 5*stride] = av_clip_pixel( dst[i + 5*stride] + ((b4 - b3) >> 6) ); 150 dst[i + 6*stride] = av_clip_pixel( dst[i + 6*stride] + ((b2 - b5) >> 6) ); 151 dst[i + 7*stride] = av_clip_pixel( dst[i + 7*stride] + ((b0 - b7) >> 6) ); 152 } 153} 154 155// assumes all AC coefs are 0 156void FUNCC(ff_h264_idct_dc_add)(uint8_t *_dst, DCTELEM *block, int stride){ 157 int i, j; 158 int dc = (((dctcoef*)block)[0] + 32) >> 6; 159 pixel *dst = (pixel*)_dst; 160 stride /= sizeof(pixel); 161 for( j = 0; j < 4; j++ ) 162 { 163 for( i = 0; i < 4; i++ ) 164 dst[i] = av_clip_pixel( dst[i] + dc ); 165 dst += stride; 166 } 167} 168 169void FUNCC(ff_h264_idct8_dc_add)(uint8_t *_dst, DCTELEM *block, int stride){ 170 int i, j; 171 int dc = (((dctcoef*)block)[0] + 32) >> 6; 172 pixel *dst = (pixel*)_dst; 173 stride /= sizeof(pixel); 174 for( j = 0; j < 8; j++ ) 175 { 176 for( i = 0; i < 8; i++ ) 177 dst[i] = av_clip_pixel( dst[i] + dc ); 178 dst += stride; 179 } 180} 181 182void FUNCC(ff_h264_idct_add16)(uint8_t *dst, const int *block_offset, DCTELEM *block, int stride, const uint8_t nnzc[15*8]){ 183 int i; 184 for(i=0; i<16; i++){ 185 int nnz = nnzc[ scan8[i] ]; 186 if(nnz){ 187 if(nnz==1 && ((dctcoef*)block)[i*16]) FUNCC(ff_h264_idct_dc_add)(dst + block_offset[i], block + i*16*sizeof(pixel), stride); 188 else FUNCC(ff_h264_idct_add )(dst + block_offset[i], block + i*16*sizeof(pixel), stride); 189 } 190 } 191} 192 193void FUNCC(ff_h264_idct_add16intra)(uint8_t *dst, const int *block_offset, DCTELEM *block, int stride, const uint8_t nnzc[15*8]){ 194 int i; 195 for(i=0; i<16; i++){ 196 if(nnzc[ scan8[i] ]) FUNCC(ff_h264_idct_add )(dst + block_offset[i], block + i*16*sizeof(pixel), stride); 197 else if(((dctcoef*)block)[i*16]) FUNCC(ff_h264_idct_dc_add)(dst + block_offset[i], block + i*16*sizeof(pixel), stride); 198 } 199} 200 201void FUNCC(ff_h264_idct8_add4)(uint8_t *dst, const int *block_offset, DCTELEM *block, int stride, const uint8_t nnzc[15*8]){ 202 int i; 203 for(i=0; i<16; i+=4){ 204 int nnz = nnzc[ scan8[i] ]; 205 if(nnz){ 206 if(nnz==1 && ((dctcoef*)block)[i*16]) FUNCC(ff_h264_idct8_dc_add)(dst + block_offset[i], block + i*16*sizeof(pixel), stride); 207 else FUNCC(ff_h264_idct8_add )(dst + block_offset[i], block + i*16*sizeof(pixel), stride); 208 } 209 } 210} 211 212void FUNCC(ff_h264_idct_add8)(uint8_t **dest, const int *block_offset, DCTELEM *block, int stride, const uint8_t nnzc[15*8]){ 213 int i, j; 214 for(j=1; j<3; j++){ 215 for(i=j*16; i<j*16+4; i++){ 216 if(nnzc[ scan8[i] ]) 217 FUNCC(ff_h264_idct_add )(dest[j-1] + block_offset[i], block + i*16*sizeof(pixel), stride); 218 else if(((dctcoef*)block)[i*16]) 219 FUNCC(ff_h264_idct_dc_add)(dest[j-1] + block_offset[i], block + i*16*sizeof(pixel), stride); 220 } 221 } 222} 223 224void FUNCC(ff_h264_idct_add8_422)(uint8_t **dest, const int *block_offset, DCTELEM *block, int stride, const uint8_t nnzc[15*8]){ 225 int i, j; 226 227 for(j=1; j<3; j++){ 228 for(i=j*16; i<j*16+4; i++){ 229 if(nnzc[ scan8[i] ]) 230 FUNCC(ff_h264_idct_add )(dest[j-1] + block_offset[i], 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], block + i*16*sizeof(pixel), stride); 233 } 234 } 235 236 for(j=1; j<3; j++){ 237 for(i=j*16+4; i<j*16+8; i++){ 238 if(nnzc[ scan8[i+4] ]) 239 FUNCC(ff_h264_idct_add )(dest[j-1] + block_offset[i+4], block + i*16*sizeof(pixel), stride); 240 else if(((dctcoef*)block)[i*16]) 241 FUNCC(ff_h264_idct_dc_add)(dest[j-1] + block_offset[i+4], block + i*16*sizeof(pixel), stride); 242 } 243 } 244} 245 246/** 247 * IDCT transforms the 16 dc values and dequantizes them. 248 * @param qmul quantization parameter 249 */ 250void FUNCC(ff_h264_luma_dc_dequant_idct)(DCTELEM *_output, DCTELEM *_input, int qmul){ 251#define stride 16 252 int i; 253 int temp[16]; 254 static const uint8_t x_offset[4]={0, 2*stride, 8*stride, 10*stride}; 255 dctcoef *input = (dctcoef*)_input; 256 dctcoef *output = (dctcoef*)_output; 257 258 for(i=0; i<4; i++){ 259 const int z0= input[4*i+0] + input[4*i+1]; 260 const int z1= input[4*i+0] - input[4*i+1]; 261 const int z2= input[4*i+2] - input[4*i+3]; 262 const int z3= input[4*i+2] + input[4*i+3]; 263 264 temp[4*i+0]= z0+z3; 265 temp[4*i+1]= z0-z3; 266 temp[4*i+2]= z1-z2; 267 temp[4*i+3]= z1+z2; 268 } 269 270 for(i=0; i<4; i++){ 271 const int offset= x_offset[i]; 272 const int z0= temp[4*0+i] + temp[4*2+i]; 273 const int z1= temp[4*0+i] - temp[4*2+i]; 274 const int z2= temp[4*1+i] - temp[4*3+i]; 275 const int z3= temp[4*1+i] + temp[4*3+i]; 276 277 output[stride* 0+offset]= ((((z0 + z3)*qmul + 128 ) >> 8)); 278 output[stride* 1+offset]= ((((z1 + z2)*qmul + 128 ) >> 8)); 279 output[stride* 4+offset]= ((((z1 - z2)*qmul + 128 ) >> 8)); 280 output[stride* 5+offset]= ((((z0 - z3)*qmul + 128 ) >> 8)); 281 } 282#undef stride 283} 284 285void FUNCC(ff_h264_chroma422_dc_dequant_idct)(DCTELEM *_block, int qmul){ 286 const int stride= 16*2; 287 const int xStride= 16; 288 int i; 289 int temp[8]; 290 static const uint8_t x_offset[2]={0, 16}; 291 dctcoef *block = (dctcoef*)_block; 292 293 for(i=0; i<4; i++){ 294 temp[2*i+0] = block[stride*i + xStride*0] + block[stride*i + xStride*1]; 295 temp[2*i+1] = block[stride*i + xStride*0] - block[stride*i + xStride*1]; 296 } 297 298 for(i=0; i<2; i++){ 299 const int offset= x_offset[i]; 300 const int z0= temp[2*0+i] + temp[2*2+i]; 301 const int z1= temp[2*0+i] - temp[2*2+i]; 302 const int z2= temp[2*1+i] - temp[2*3+i]; 303 const int z3= temp[2*1+i] + temp[2*3+i]; 304 305 block[stride*0+offset]= ((z0 + z3)*qmul + 128) >> 8; 306 block[stride*1+offset]= ((z1 + z2)*qmul + 128) >> 8; 307 block[stride*2+offset]= ((z1 - z2)*qmul + 128) >> 8; 308 block[stride*3+offset]= ((z0 - z3)*qmul + 128) >> 8; 309 } 310} 311 312void FUNCC(ff_h264_chroma_dc_dequant_idct)(DCTELEM *_block, int qmul){ 313 const int stride= 16*2; 314 const int xStride= 16; 315 int a,b,c,d,e; 316 dctcoef *block = (dctcoef*)_block; 317 318 a= block[stride*0 + xStride*0]; 319 b= block[stride*0 + xStride*1]; 320 c= block[stride*1 + xStride*0]; 321 d= block[stride*1 + xStride*1]; 322 323 e= a-b; 324 a= a+b; 325 b= c-d; 326 c= c+d; 327 328 block[stride*0 + xStride*0]= ((a+c)*qmul) >> 7; 329 block[stride*0 + xStride*1]= ((e+b)*qmul) >> 7; 330 block[stride*1 + xStride*0]= ((a-c)*qmul) >> 7; 331 block[stride*1 + xStride*1]= ((e-b)*qmul) >> 7; 332} 333