pred.go (6148B)
1 // Copyright 2011 The Go Authors. All rights reserved. 2 // Use of this source code is governed by a BSD-style 3 // license that can be found in the LICENSE file. 4 5 package vp8 6 7 // This file implements parsing the predictor modes, as specified in chapter 8 // 11. 9 10 func (d *Decoder) parsePredModeY16(mbx int) { 11 var p uint8 12 if !d.fp.readBit(156) { 13 if !d.fp.readBit(163) { 14 p = predDC 15 } else { 16 p = predVE 17 } 18 } else if !d.fp.readBit(128) { 19 p = predHE 20 } else { 21 p = predTM 22 } 23 for i := 0; i < 4; i++ { 24 d.upMB[mbx].pred[i] = p 25 d.leftMB.pred[i] = p 26 } 27 d.predY16 = p 28 } 29 30 func (d *Decoder) parsePredModeC8() { 31 if !d.fp.readBit(142) { 32 d.predC8 = predDC 33 } else if !d.fp.readBit(114) { 34 d.predC8 = predVE 35 } else if !d.fp.readBit(183) { 36 d.predC8 = predHE 37 } else { 38 d.predC8 = predTM 39 } 40 } 41 42 func (d *Decoder) parsePredModeY4(mbx int) { 43 for j := 0; j < 4; j++ { 44 p := d.leftMB.pred[j] 45 for i := 0; i < 4; i++ { 46 prob := &predProb[d.upMB[mbx].pred[i]][p] 47 if !d.fp.readBit(prob[0]) { 48 p = predDC 49 } else if !d.fp.readBit(prob[1]) { 50 p = predTM 51 } else if !d.fp.readBit(prob[2]) { 52 p = predVE 53 } else if !d.fp.readBit(prob[3]) { 54 if !d.fp.readBit(prob[4]) { 55 p = predHE 56 } else if !d.fp.readBit(prob[5]) { 57 p = predRD 58 } else { 59 p = predVR 60 } 61 } else if !d.fp.readBit(prob[6]) { 62 p = predLD 63 } else if !d.fp.readBit(prob[7]) { 64 p = predVL 65 } else if !d.fp.readBit(prob[8]) { 66 p = predHD 67 } else { 68 p = predHU 69 } 70 d.predY4[j][i] = p 71 d.upMB[mbx].pred[i] = p 72 } 73 d.leftMB.pred[j] = p 74 } 75 } 76 77 // predProb are the probabilities to decode a 4x4 region's predictor mode given 78 // the predictor modes of the regions above and left of it. 79 // These values are specified in section 11.5. 80 var predProb = [nPred][nPred][9]uint8{ 81 { 82 {231, 120, 48, 89, 115, 113, 120, 152, 112}, 83 {152, 179, 64, 126, 170, 118, 46, 70, 95}, 84 {175, 69, 143, 80, 85, 82, 72, 155, 103}, 85 {56, 58, 10, 171, 218, 189, 17, 13, 152}, 86 {114, 26, 17, 163, 44, 195, 21, 10, 173}, 87 {121, 24, 80, 195, 26, 62, 44, 64, 85}, 88 {144, 71, 10, 38, 171, 213, 144, 34, 26}, 89 {170, 46, 55, 19, 136, 160, 33, 206, 71}, 90 {63, 20, 8, 114, 114, 208, 12, 9, 226}, 91 {81, 40, 11, 96, 182, 84, 29, 16, 36}, 92 }, 93 { 94 {134, 183, 89, 137, 98, 101, 106, 165, 148}, 95 {72, 187, 100, 130, 157, 111, 32, 75, 80}, 96 {66, 102, 167, 99, 74, 62, 40, 234, 128}, 97 {41, 53, 9, 178, 241, 141, 26, 8, 107}, 98 {74, 43, 26, 146, 73, 166, 49, 23, 157}, 99 {65, 38, 105, 160, 51, 52, 31, 115, 128}, 100 {104, 79, 12, 27, 217, 255, 87, 17, 7}, 101 {87, 68, 71, 44, 114, 51, 15, 186, 23}, 102 {47, 41, 14, 110, 182, 183, 21, 17, 194}, 103 {66, 45, 25, 102, 197, 189, 23, 18, 22}, 104 }, 105 { 106 {88, 88, 147, 150, 42, 46, 45, 196, 205}, 107 {43, 97, 183, 117, 85, 38, 35, 179, 61}, 108 {39, 53, 200, 87, 26, 21, 43, 232, 171}, 109 {56, 34, 51, 104, 114, 102, 29, 93, 77}, 110 {39, 28, 85, 171, 58, 165, 90, 98, 64}, 111 {34, 22, 116, 206, 23, 34, 43, 166, 73}, 112 {107, 54, 32, 26, 51, 1, 81, 43, 31}, 113 {68, 25, 106, 22, 64, 171, 36, 225, 114}, 114 {34, 19, 21, 102, 132, 188, 16, 76, 124}, 115 {62, 18, 78, 95, 85, 57, 50, 48, 51}, 116 }, 117 { 118 {193, 101, 35, 159, 215, 111, 89, 46, 111}, 119 {60, 148, 31, 172, 219, 228, 21, 18, 111}, 120 {112, 113, 77, 85, 179, 255, 38, 120, 114}, 121 {40, 42, 1, 196, 245, 209, 10, 25, 109}, 122 {88, 43, 29, 140, 166, 213, 37, 43, 154}, 123 {61, 63, 30, 155, 67, 45, 68, 1, 209}, 124 {100, 80, 8, 43, 154, 1, 51, 26, 71}, 125 {142, 78, 78, 16, 255, 128, 34, 197, 171}, 126 {41, 40, 5, 102, 211, 183, 4, 1, 221}, 127 {51, 50, 17, 168, 209, 192, 23, 25, 82}, 128 }, 129 { 130 {138, 31, 36, 171, 27, 166, 38, 44, 229}, 131 {67, 87, 58, 169, 82, 115, 26, 59, 179}, 132 {63, 59, 90, 180, 59, 166, 93, 73, 154}, 133 {40, 40, 21, 116, 143, 209, 34, 39, 175}, 134 {47, 15, 16, 183, 34, 223, 49, 45, 183}, 135 {46, 17, 33, 183, 6, 98, 15, 32, 183}, 136 {57, 46, 22, 24, 128, 1, 54, 17, 37}, 137 {65, 32, 73, 115, 28, 128, 23, 128, 205}, 138 {40, 3, 9, 115, 51, 192, 18, 6, 223}, 139 {87, 37, 9, 115, 59, 77, 64, 21, 47}, 140 }, 141 { 142 {104, 55, 44, 218, 9, 54, 53, 130, 226}, 143 {64, 90, 70, 205, 40, 41, 23, 26, 57}, 144 {54, 57, 112, 184, 5, 41, 38, 166, 213}, 145 {30, 34, 26, 133, 152, 116, 10, 32, 134}, 146 {39, 19, 53, 221, 26, 114, 32, 73, 255}, 147 {31, 9, 65, 234, 2, 15, 1, 118, 73}, 148 {75, 32, 12, 51, 192, 255, 160, 43, 51}, 149 {88, 31, 35, 67, 102, 85, 55, 186, 85}, 150 {56, 21, 23, 111, 59, 205, 45, 37, 192}, 151 {55, 38, 70, 124, 73, 102, 1, 34, 98}, 152 }, 153 { 154 {125, 98, 42, 88, 104, 85, 117, 175, 82}, 155 {95, 84, 53, 89, 128, 100, 113, 101, 45}, 156 {75, 79, 123, 47, 51, 128, 81, 171, 1}, 157 {57, 17, 5, 71, 102, 57, 53, 41, 49}, 158 {38, 33, 13, 121, 57, 73, 26, 1, 85}, 159 {41, 10, 67, 138, 77, 110, 90, 47, 114}, 160 {115, 21, 2, 10, 102, 255, 166, 23, 6}, 161 {101, 29, 16, 10, 85, 128, 101, 196, 26}, 162 {57, 18, 10, 102, 102, 213, 34, 20, 43}, 163 {117, 20, 15, 36, 163, 128, 68, 1, 26}, 164 }, 165 { 166 {102, 61, 71, 37, 34, 53, 31, 243, 192}, 167 {69, 60, 71, 38, 73, 119, 28, 222, 37}, 168 {68, 45, 128, 34, 1, 47, 11, 245, 171}, 169 {62, 17, 19, 70, 146, 85, 55, 62, 70}, 170 {37, 43, 37, 154, 100, 163, 85, 160, 1}, 171 {63, 9, 92, 136, 28, 64, 32, 201, 85}, 172 {75, 15, 9, 9, 64, 255, 184, 119, 16}, 173 {86, 6, 28, 5, 64, 255, 25, 248, 1}, 174 {56, 8, 17, 132, 137, 255, 55, 116, 128}, 175 {58, 15, 20, 82, 135, 57, 26, 121, 40}, 176 }, 177 { 178 {164, 50, 31, 137, 154, 133, 25, 35, 218}, 179 {51, 103, 44, 131, 131, 123, 31, 6, 158}, 180 {86, 40, 64, 135, 148, 224, 45, 183, 128}, 181 {22, 26, 17, 131, 240, 154, 14, 1, 209}, 182 {45, 16, 21, 91, 64, 222, 7, 1, 197}, 183 {56, 21, 39, 155, 60, 138, 23, 102, 213}, 184 {83, 12, 13, 54, 192, 255, 68, 47, 28}, 185 {85, 26, 85, 85, 128, 128, 32, 146, 171}, 186 {18, 11, 7, 63, 144, 171, 4, 4, 246}, 187 {35, 27, 10, 146, 174, 171, 12, 26, 128}, 188 }, 189 { 190 {190, 80, 35, 99, 180, 80, 126, 54, 45}, 191 {85, 126, 47, 87, 176, 51, 41, 20, 32}, 192 {101, 75, 128, 139, 118, 146, 116, 128, 85}, 193 {56, 41, 15, 176, 236, 85, 37, 9, 62}, 194 {71, 30, 17, 119, 118, 255, 17, 18, 138}, 195 {101, 38, 60, 138, 55, 70, 43, 26, 142}, 196 {146, 36, 19, 30, 171, 255, 97, 27, 20}, 197 {138, 45, 61, 62, 219, 1, 81, 188, 64}, 198 {32, 41, 20, 117, 151, 142, 20, 21, 163}, 199 {112, 19, 12, 61, 195, 128, 48, 4, 24}, 200 }, 201 }