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| 4349 | Serge | 1 | /* |
| 2 | * H.264 IDCT |
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| 3 | * Copyright (c) 2004-2011 Michael Niedermayer |
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| 4 | * |
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| 5 | * This file is part of FFmpeg. |
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| 6 | * |
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| 7 | * FFmpeg is free software; you can redistribute it and/or |
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| 8 | * modify it under the terms of the GNU Lesser General Public |
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| 9 | * License as published by the Free Software Foundation; either |
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| 10 | * version 2.1 of the License, or (at your option) any later version. |
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| 11 | * |
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| 12 | * FFmpeg is distributed in the hope that it will be useful, |
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| 13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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| 15 | * Lesser General Public License for more details. |
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| 16 | * |
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| 17 | * You should have received a copy of the GNU Lesser General Public |
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| 18 | * License along with FFmpeg; if not, write to the Free Software |
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| 19 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
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| 20 | */ |
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| 21 | |||
| 22 | /** |
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| 23 | * @file |
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| 24 | * H.264 IDCT. |
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| 25 | * @author Michael Niedermayer |
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| 26 | */ |
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| 27 | |||
| 28 | #include "bit_depth_template.c" |
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| 29 | #include "libavutil/common.h" |
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| 30 | #include "h264.h" |
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| 31 | |||
| 32 | void FUNCC(ff_h264_idct_add)(uint8_t *_dst, int16_t *_block, int stride) |
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| 33 | { |
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| 34 | int i; |
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| 35 | pixel *dst = (pixel*)_dst; |
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| 36 | dctcoef *block = (dctcoef*)_block; |
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| 37 | stride >>= sizeof(pixel)-1; |
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| 38 | |||
| 39 | block[0] += 1 << 5; |
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| 40 | |||
| 41 | for(i=0; i<4; i++){ |
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| 42 | const int z0= block[i + 4*0] + block[i + 4*2]; |
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| 43 | const int z1= block[i + 4*0] - block[i + 4*2]; |
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| 44 | const int z2= (block[i + 4*1]>>1) - block[i + 4*3]; |
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| 45 | const int z3= block[i + 4*1] + (block[i + 4*3]>>1); |
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| 46 | |||
| 47 | block[i + 4*0]= z0 + z3; |
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| 48 | block[i + 4*1]= z1 + z2; |
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| 49 | block[i + 4*2]= z1 - z2; |
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| 50 | block[i + 4*3]= z0 - z3; |
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| 51 | } |
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| 52 | |||
| 53 | for(i=0; i<4; i++){ |
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| 54 | const int z0= block[0 + 4*i] + block[2 + 4*i]; |
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| 55 | const int z1= block[0 + 4*i] - block[2 + 4*i]; |
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| 56 | const int z2= (block[1 + 4*i]>>1) - block[3 + 4*i]; |
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| 57 | const int z3= block[1 + 4*i] + (block[3 + 4*i]>>1); |
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| 58 | |||
| 59 | dst[i + 0*stride]= av_clip_pixel(dst[i + 0*stride] + ((z0 + z3) >> 6)); |
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| 60 | dst[i + 1*stride]= av_clip_pixel(dst[i + 1*stride] + ((z1 + z2) >> 6)); |
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| 61 | dst[i + 2*stride]= av_clip_pixel(dst[i + 2*stride] + ((z1 - z2) >> 6)); |
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| 62 | dst[i + 3*stride]= av_clip_pixel(dst[i + 3*stride] + ((z0 - z3) >> 6)); |
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| 63 | } |
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| 64 | |||
| 65 | memset(block, 0, 16 * sizeof(dctcoef)); |
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| 66 | } |
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| 67 | |||
| 68 | void FUNCC(ff_h264_idct8_add)(uint8_t *_dst, int16_t *_block, int stride){ |
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| 69 | int i; |
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| 70 | pixel *dst = (pixel*)_dst; |
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| 71 | dctcoef *block = (dctcoef*)_block; |
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| 72 | stride >>= sizeof(pixel)-1; |
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| 73 | |||
| 74 | block[0] += 32; |
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| 75 | |||
| 76 | for( i = 0; i < 8; i++ ) |
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| 77 | { |
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| 78 | const int a0 = block[i+0*8] + block[i+4*8]; |
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| 79 | const int a2 = block[i+0*8] - block[i+4*8]; |
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| 80 | const int a4 = (block[i+2*8]>>1) - block[i+6*8]; |
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| 81 | const int a6 = (block[i+6*8]>>1) + block[i+2*8]; |
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| 82 | |||
| 83 | const int b0 = a0 + a6; |
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| 84 | const int b2 = a2 + a4; |
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| 85 | const int b4 = a2 - a4; |
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| 86 | const int b6 = a0 - a6; |
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| 87 | |||
| 88 | const int a1 = -block[i+3*8] + block[i+5*8] - block[i+7*8] - (block[i+7*8]>>1); |
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| 89 | const int a3 = block[i+1*8] + block[i+7*8] - block[i+3*8] - (block[i+3*8]>>1); |
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| 90 | const int a5 = -block[i+1*8] + block[i+7*8] + block[i+5*8] + (block[i+5*8]>>1); |
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| 91 | const int a7 = block[i+3*8] + block[i+5*8] + block[i+1*8] + (block[i+1*8]>>1); |
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| 92 | |||
| 93 | const int b1 = (a7>>2) + a1; |
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| 94 | const int b3 = a3 + (a5>>2); |
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| 95 | const int b5 = (a3>>2) - a5; |
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| 96 | const int b7 = a7 - (a1>>2); |
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| 97 | |||
| 98 | block[i+0*8] = b0 + b7; |
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| 99 | block[i+7*8] = b0 - b7; |
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| 100 | block[i+1*8] = b2 + b5; |
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| 101 | block[i+6*8] = b2 - b5; |
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| 102 | block[i+2*8] = b4 + b3; |
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| 103 | block[i+5*8] = b4 - b3; |
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| 104 | block[i+3*8] = b6 + b1; |
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| 105 | block[i+4*8] = b6 - b1; |
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| 106 | } |
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| 107 | for( i = 0; i < 8; i++ ) |
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| 108 | { |
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| 109 | const int a0 = block[0+i*8] + block[4+i*8]; |
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| 110 | const int a2 = block[0+i*8] - block[4+i*8]; |
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| 111 | const int a4 = (block[2+i*8]>>1) - block[6+i*8]; |
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| 112 | const int a6 = (block[6+i*8]>>1) + block[2+i*8]; |
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| 113 | |||
| 114 | const int b0 = a0 + a6; |
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| 115 | const int b2 = a2 + a4; |
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| 116 | const int b4 = a2 - a4; |
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| 117 | const int b6 = a0 - a6; |
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| 118 | |||
| 119 | const int a1 = -block[3+i*8] + block[5+i*8] - block[7+i*8] - (block[7+i*8]>>1); |
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| 120 | const int a3 = block[1+i*8] + block[7+i*8] - block[3+i*8] - (block[3+i*8]>>1); |
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| 121 | const int a5 = -block[1+i*8] + block[7+i*8] + block[5+i*8] + (block[5+i*8]>>1); |
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| 122 | const int a7 = block[3+i*8] + block[5+i*8] + block[1+i*8] + (block[1+i*8]>>1); |
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| 123 | |||
| 124 | const int b1 = (a7>>2) + a1; |
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| 125 | const int b3 = a3 + (a5>>2); |
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| 126 | const int b5 = (a3>>2) - a5; |
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| 127 | const int b7 = a7 - (a1>>2); |
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| 128 | |||
| 129 | dst[i + 0*stride] = av_clip_pixel( dst[i + 0*stride] + ((b0 + b7) >> 6) ); |
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| 130 | dst[i + 1*stride] = av_clip_pixel( dst[i + 1*stride] + ((b2 + b5) >> 6) ); |
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| 131 | dst[i + 2*stride] = av_clip_pixel( dst[i + 2*stride] + ((b4 + b3) >> 6) ); |
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| 132 | dst[i + 3*stride] = av_clip_pixel( dst[i + 3*stride] + ((b6 + b1) >> 6) ); |
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| 133 | dst[i + 4*stride] = av_clip_pixel( dst[i + 4*stride] + ((b6 - b1) >> 6) ); |
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| 134 | dst[i + 5*stride] = av_clip_pixel( dst[i + 5*stride] + ((b4 - b3) >> 6) ); |
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| 135 | dst[i + 6*stride] = av_clip_pixel( dst[i + 6*stride] + ((b2 - b5) >> 6) ); |
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| 136 | dst[i + 7*stride] = av_clip_pixel( dst[i + 7*stride] + ((b0 - b7) >> 6) ); |
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| 137 | } |
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| 138 | |||
| 139 | memset(block, 0, 64 * sizeof(dctcoef)); |
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| 140 | } |
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| 141 | |||
| 142 | // assumes all AC coefs are 0 |
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| 143 | void FUNCC(ff_h264_idct_dc_add)(uint8_t *_dst, int16_t *_block, int stride){ |
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| 144 | int i, j; |
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| 145 | pixel *dst = (pixel*)_dst; |
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| 146 | dctcoef *block = (dctcoef*)_block; |
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| 147 | int dc = (block[0] + 32) >> 6; |
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| 148 | stride /= sizeof(pixel); |
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| 149 | block[0] = 0; |
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| 150 | for( j = 0; j < 4; j++ ) |
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| 151 | { |
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| 152 | for( i = 0; i < 4; i++ ) |
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| 153 | dst[i] = av_clip_pixel( dst[i] + dc ); |
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| 154 | dst += stride; |
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| 155 | } |
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| 156 | } |
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| 157 | |||
| 158 | void FUNCC(ff_h264_idct8_dc_add)(uint8_t *_dst, int16_t *_block, int stride){ |
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| 159 | int i, j; |
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| 160 | pixel *dst = (pixel*)_dst; |
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| 161 | dctcoef *block = (dctcoef*)_block; |
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| 162 | int dc = (block[0] + 32) >> 6; |
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| 163 | block[0] = 0; |
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| 164 | stride /= sizeof(pixel); |
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| 165 | for( j = 0; j < 8; j++ ) |
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| 166 | { |
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| 167 | for( i = 0; i < 8; i++ ) |
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| 168 | dst[i] = av_clip_pixel( dst[i] + dc ); |
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| 169 | dst += stride; |
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| 170 | } |
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| 171 | } |
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| 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]){ |
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| 174 | int i; |
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| 175 | for(i=0; i<16; i++){ |
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| 176 | int nnz = nnzc[ scan8[i] ]; |
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| 177 | if(nnz){ |
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| 178 | if(nnz==1 && ((dctcoef*)block)[i*16]) FUNCC(ff_h264_idct_dc_add)(dst + block_offset[i], block + i*16*sizeof(pixel), stride); |
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| 179 | else FUNCC(ff_h264_idct_add )(dst + block_offset[i], block + i*16*sizeof(pixel), stride); |
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| 180 | } |
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| 181 | } |
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| 182 | } |
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| 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]){ |
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| 185 | int i; |
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| 186 | for(i=0; i<16; i++){ |
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| 187 | if(nnzc[ scan8[i] ]) FUNCC(ff_h264_idct_add )(dst + block_offset[i], block + i*16*sizeof(pixel), stride); |
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| 188 | else if(((dctcoef*)block)[i*16]) FUNCC(ff_h264_idct_dc_add)(dst + block_offset[i], block + i*16*sizeof(pixel), stride); |
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| 189 | } |
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| 190 | } |
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| 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]){ |
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| 193 | int i; |
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| 194 | for(i=0; i<16; i+=4){ |
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| 195 | int nnz = nnzc[ scan8[i] ]; |
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| 196 | if(nnz){ |
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| 197 | if(nnz==1 && ((dctcoef*)block)[i*16]) FUNCC(ff_h264_idct8_dc_add)(dst + block_offset[i], block + i*16*sizeof(pixel), stride); |
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| 198 | else FUNCC(ff_h264_idct8_add )(dst + block_offset[i], block + i*16*sizeof(pixel), stride); |
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| 199 | } |
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| 200 | } |
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| 201 | } |
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| 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]){ |
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| 204 | int i, j; |
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| 205 | for(j=1; j<3; j++){ |
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| 206 | for(i=j*16; i |
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| 207 | if(nnzc[ scan8[i] ]) |
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| 208 | FUNCC(ff_h264_idct_add )(dest[j-1] + block_offset[i], block + i*16*sizeof(pixel), stride); |
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| 209 | else if(((dctcoef*)block)[i*16]) |
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| 210 | FUNCC(ff_h264_idct_dc_add)(dest[j-1] + block_offset[i], block + i*16*sizeof(pixel), stride); |
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| 211 | } |
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| 212 | } |
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| 213 | } |
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| 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]){ |
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| 216 | int i, j; |
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| 217 | |||
| 218 | for(j=1; j<3; j++){ |
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| 219 | for(i=j*16; i |
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| 220 | if(nnzc[ scan8[i] ]) |
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| 221 | FUNCC(ff_h264_idct_add )(dest[j-1] + block_offset[i], block + i*16*sizeof(pixel), stride); |
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| 222 | else if(((dctcoef*)block)[i*16]) |
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| 223 | FUNCC(ff_h264_idct_dc_add)(dest[j-1] + block_offset[i], block + i*16*sizeof(pixel), stride); |
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| 224 | } |
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| 225 | } |
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| 226 | |||
| 227 | for(j=1; j<3; j++){ |
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| 228 | for(i=j*16+4; i |
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| 229 | if(nnzc[ scan8[i+4] ]) |
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| 230 | FUNCC(ff_h264_idct_add )(dest[j-1] + block_offset[i+4], block + i*16*sizeof(pixel), stride); |
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| 231 | else if(((dctcoef*)block)[i*16]) |
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| 232 | FUNCC(ff_h264_idct_dc_add)(dest[j-1] + block_offset[i+4], block + i*16*sizeof(pixel), stride); |
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| 233 | } |
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| 234 | } |
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| 235 | } |
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| 236 | |||
| 237 | /** |
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| 238 | * IDCT transforms the 16 dc values and dequantizes them. |
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| 239 | * @param qmul quantization parameter |
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| 240 | */ |
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| 241 | void FUNCC(ff_h264_luma_dc_dequant_idct)(int16_t *_output, int16_t *_input, int qmul){ |
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| 242 | #define stride 16 |
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| 243 | int i; |
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| 244 | int temp[16]; |
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| 245 | static const uint8_t x_offset[4]={0, 2*stride, 8*stride, 10*stride}; |
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| 246 | dctcoef *input = (dctcoef*)_input; |
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| 247 | dctcoef *output = (dctcoef*)_output; |
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| 248 | |||
| 249 | for(i=0; i<4; i++){ |
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| 250 | const int z0= input[4*i+0] + input[4*i+1]; |
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| 251 | const int z1= input[4*i+0] - input[4*i+1]; |
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| 252 | const int z2= input[4*i+2] - input[4*i+3]; |
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| 253 | const int z3= input[4*i+2] + input[4*i+3]; |
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| 254 | |||
| 255 | temp[4*i+0]= z0+z3; |
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| 256 | temp[4*i+1]= z0-z3; |
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| 257 | temp[4*i+2]= z1-z2; |
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| 258 | temp[4*i+3]= z1+z2; |
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| 259 | } |
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| 260 | |||
| 261 | for(i=0; i<4; i++){ |
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| 262 | const int offset= x_offset[i]; |
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| 263 | const int z0= temp[4*0+i] + temp[4*2+i]; |
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| 264 | const int z1= temp[4*0+i] - temp[4*2+i]; |
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| 265 | const int z2= temp[4*1+i] - temp[4*3+i]; |
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| 266 | const int z3= temp[4*1+i] + temp[4*3+i]; |
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| 267 | |||
| 268 | output[stride* 0+offset]= ((((z0 + z3)*qmul + 128 ) >> 8)); |
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| 269 | output[stride* 1+offset]= ((((z1 + z2)*qmul + 128 ) >> 8)); |
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| 270 | output[stride* 4+offset]= ((((z1 - z2)*qmul + 128 ) >> 8)); |
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| 271 | output[stride* 5+offset]= ((((z0 - z3)*qmul + 128 ) >> 8)); |
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| 272 | } |
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| 273 | #undef stride |
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| 274 | } |
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| 275 | |||
| 276 | void FUNCC(ff_h264_chroma422_dc_dequant_idct)(int16_t *_block, int qmul){ |
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| 277 | const int stride= 16*2; |
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| 278 | const int xStride= 16; |
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| 279 | int i; |
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| 280 | int temp[8]; |
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| 281 | static const uint8_t x_offset[2]={0, 16}; |
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| 282 | dctcoef *block = (dctcoef*)_block; |
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| 283 | |||
| 284 | for(i=0; i<4; i++){ |
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| 285 | temp[2*i+0] = block[stride*i + xStride*0] + block[stride*i + xStride*1]; |
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| 286 | temp[2*i+1] = block[stride*i + xStride*0] - block[stride*i + xStride*1]; |
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| 287 | } |
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| 288 | |||
| 289 | for(i=0; i<2; i++){ |
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| 290 | const int offset= x_offset[i]; |
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| 291 | const int z0= temp[2*0+i] + temp[2*2+i]; |
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| 292 | const int z1= temp[2*0+i] - temp[2*2+i]; |
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| 293 | const int z2= temp[2*1+i] - temp[2*3+i]; |
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| 294 | const int z3= temp[2*1+i] + temp[2*3+i]; |
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| 295 | |||
| 296 | block[stride*0+offset]= ((z0 + z3)*qmul + 128) >> 8; |
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| 297 | block[stride*1+offset]= ((z1 + z2)*qmul + 128) >> 8; |
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| 298 | block[stride*2+offset]= ((z1 - z2)*qmul + 128) >> 8; |
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| 299 | block[stride*3+offset]= ((z0 - z3)*qmul + 128) >> 8; |
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| 300 | } |
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| 301 | } |
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| 302 | |||
| 303 | void FUNCC(ff_h264_chroma_dc_dequant_idct)(int16_t *_block, int qmul){ |
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| 304 | const int stride= 16*2; |
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| 305 | const int xStride= 16; |
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| 306 | int a,b,c,d,e; |
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| 307 | dctcoef *block = (dctcoef*)_block; |
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| 308 | |||
| 309 | a= block[stride*0 + xStride*0]; |
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| 310 | b= block[stride*0 + xStride*1]; |
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| 311 | c= block[stride*1 + xStride*0]; |
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| 312 | d= block[stride*1 + xStride*1]; |
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| 313 | |||
| 314 | e= a-b; |
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| 315 | a= a+b; |
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| 316 | b= c-d; |
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| 317 | c= c+d; |
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| 318 | |||
| 319 | block[stride*0 + xStride*0]= ((a+c)*qmul) >> 7; |
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| 320 | block[stride*0 + xStride*1]= ((e+b)*qmul) >> 7; |
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| 321 | block[stride*1 + xStride*0]= ((a-c)*qmul) >> 7; |
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| 322 | block[stride*1 + xStride*1]= ((e-b)*qmul) >> 7; |
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| 323 | } |