| 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 | } |