diff options
Diffstat (limited to 'vendor/golang.org/x/image/vp8/pred.go')
| -rw-r--r-- | vendor/golang.org/x/image/vp8/pred.go | 201 |
1 files changed, 201 insertions, 0 deletions
diff --git a/vendor/golang.org/x/image/vp8/pred.go b/vendor/golang.org/x/image/vp8/pred.go new file mode 100644 index 00000000..58c2689e --- /dev/null +++ b/vendor/golang.org/x/image/vp8/pred.go @@ -0,0 +1,201 @@ +// Copyright 2011 The Go Authors. All rights reserved. +// Use of this source code is governed by a BSD-style +// license that can be found in the LICENSE file. + +package vp8 + +// This file implements parsing the predictor modes, as specified in chapter +// 11. + +func (d *Decoder) parsePredModeY16(mbx int) { + var p uint8 + if !d.fp.readBit(156) { + if !d.fp.readBit(163) { + p = predDC + } else { + p = predVE + } + } else if !d.fp.readBit(128) { + p = predHE + } else { + p = predTM + } + for i := 0; i < 4; i++ { + d.upMB[mbx].pred[i] = p + d.leftMB.pred[i] = p + } + d.predY16 = p +} + +func (d *Decoder) parsePredModeC8() { + if !d.fp.readBit(142) { + d.predC8 = predDC + } else if !d.fp.readBit(114) { + d.predC8 = predVE + } else if !d.fp.readBit(183) { + d.predC8 = predHE + } else { + d.predC8 = predTM + } +} + +func (d *Decoder) parsePredModeY4(mbx int) { + for j := 0; j < 4; j++ { + p := d.leftMB.pred[j] + for i := 0; i < 4; i++ { + prob := &predProb[d.upMB[mbx].pred[i]][p] + if !d.fp.readBit(prob[0]) { + p = predDC + } else if !d.fp.readBit(prob[1]) { + p = predTM + } else if !d.fp.readBit(prob[2]) { + p = predVE + } else if !d.fp.readBit(prob[3]) { + if !d.fp.readBit(prob[4]) { + p = predHE + } else if !d.fp.readBit(prob[5]) { + p = predRD + } else { + p = predVR + } + } else if !d.fp.readBit(prob[6]) { + p = predLD + } else if !d.fp.readBit(prob[7]) { + p = predVL + } else if !d.fp.readBit(prob[8]) { + p = predHD + } else { + p = predHU + } + d.predY4[j][i] = p + d.upMB[mbx].pred[i] = p + } + d.leftMB.pred[j] = p + } +} + +// predProb are the probabilities to decode a 4x4 region's predictor mode given +// the predictor modes of the regions above and left of it. +// These values are specified in section 11.5. +var predProb = [nPred][nPred][9]uint8{ + { + {231, 120, 48, 89, 115, 113, 120, 152, 112}, + {152, 179, 64, 126, 170, 118, 46, 70, 95}, + {175, 69, 143, 80, 85, 82, 72, 155, 103}, + {56, 58, 10, 171, 218, 189, 17, 13, 152}, + {114, 26, 17, 163, 44, 195, 21, 10, 173}, + {121, 24, 80, 195, 26, 62, 44, 64, 85}, + {144, 71, 10, 38, 171, 213, 144, 34, 26}, + {170, 46, 55, 19, 136, 160, 33, 206, 71}, + {63, 20, 8, 114, 114, 208, 12, 9, 226}, + {81, 40, 11, 96, 182, 84, 29, 16, 36}, + }, + { + {134, 183, 89, 137, 98, 101, 106, 165, 148}, + {72, 187, 100, 130, 157, 111, 32, 75, 80}, + {66, 102, 167, 99, 74, 62, 40, 234, 128}, + {41, 53, 9, 178, 241, 141, 26, 8, 107}, + {74, 43, 26, 146, 73, 166, 49, 23, 157}, + {65, 38, 105, 160, 51, 52, 31, 115, 128}, + {104, 79, 12, 27, 217, 255, 87, 17, 7}, + {87, 68, 71, 44, 114, 51, 15, 186, 23}, + {47, 41, 14, 110, 182, 183, 21, 17, 194}, + {66, 45, 25, 102, 197, 189, 23, 18, 22}, + }, + { + {88, 88, 147, 150, 42, 46, 45, 196, 205}, + {43, 97, 183, 117, 85, 38, 35, 179, 61}, + {39, 53, 200, 87, 26, 21, 43, 232, 171}, + {56, 34, 51, 104, 114, 102, 29, 93, 77}, + {39, 28, 85, 171, 58, 165, 90, 98, 64}, + {34, 22, 116, 206, 23, 34, 43, 166, 73}, + {107, 54, 32, 26, 51, 1, 81, 43, 31}, + {68, 25, 106, 22, 64, 171, 36, 225, 114}, + {34, 19, 21, 102, 132, 188, 16, 76, 124}, + {62, 18, 78, 95, 85, 57, 50, 48, 51}, + }, + { + {193, 101, 35, 159, 215, 111, 89, 46, 111}, + {60, 148, 31, 172, 219, 228, 21, 18, 111}, + {112, 113, 77, 85, 179, 255, 38, 120, 114}, + {40, 42, 1, 196, 245, 209, 10, 25, 109}, + {88, 43, 29, 140, 166, 213, 37, 43, 154}, + {61, 63, 30, 155, 67, 45, 68, 1, 209}, + {100, 80, 8, 43, 154, 1, 51, 26, 71}, + {142, 78, 78, 16, 255, 128, 34, 197, 171}, + {41, 40, 5, 102, 211, 183, 4, 1, 221}, + {51, 50, 17, 168, 209, 192, 23, 25, 82}, + }, + { + {138, 31, 36, 171, 27, 166, 38, 44, 229}, + {67, 87, 58, 169, 82, 115, 26, 59, 179}, + {63, 59, 90, 180, 59, 166, 93, 73, 154}, + {40, 40, 21, 116, 143, 209, 34, 39, 175}, + {47, 15, 16, 183, 34, 223, 49, 45, 183}, + {46, 17, 33, 183, 6, 98, 15, 32, 183}, + {57, 46, 22, 24, 128, 1, 54, 17, 37}, + {65, 32, 73, 115, 28, 128, 23, 128, 205}, + {40, 3, 9, 115, 51, 192, 18, 6, 223}, + {87, 37, 9, 115, 59, 77, 64, 21, 47}, + }, + { + {104, 55, 44, 218, 9, 54, 53, 130, 226}, + {64, 90, 70, 205, 40, 41, 23, 26, 57}, + {54, 57, 112, 184, 5, 41, 38, 166, 213}, + {30, 34, 26, 133, 152, 116, 10, 32, 134}, + {39, 19, 53, 221, 26, 114, 32, 73, 255}, + {31, 9, 65, 234, 2, 15, 1, 118, 73}, + {75, 32, 12, 51, 192, 255, 160, 43, 51}, + {88, 31, 35, 67, 102, 85, 55, 186, 85}, + {56, 21, 23, 111, 59, 205, 45, 37, 192}, + {55, 38, 70, 124, 73, 102, 1, 34, 98}, + }, + { + {125, 98, 42, 88, 104, 85, 117, 175, 82}, + {95, 84, 53, 89, 128, 100, 113, 101, 45}, + {75, 79, 123, 47, 51, 128, 81, 171, 1}, + {57, 17, 5, 71, 102, 57, 53, 41, 49}, + {38, 33, 13, 121, 57, 73, 26, 1, 85}, + {41, 10, 67, 138, 77, 110, 90, 47, 114}, + {115, 21, 2, 10, 102, 255, 166, 23, 6}, + {101, 29, 16, 10, 85, 128, 101, 196, 26}, + {57, 18, 10, 102, 102, 213, 34, 20, 43}, + {117, 20, 15, 36, 163, 128, 68, 1, 26}, + }, + { + {102, 61, 71, 37, 34, 53, 31, 243, 192}, + {69, 60, 71, 38, 73, 119, 28, 222, 37}, + {68, 45, 128, 34, 1, 47, 11, 245, 171}, + {62, 17, 19, 70, 146, 85, 55, 62, 70}, + {37, 43, 37, 154, 100, 163, 85, 160, 1}, + {63, 9, 92, 136, 28, 64, 32, 201, 85}, + {75, 15, 9, 9, 64, 255, 184, 119, 16}, + {86, 6, 28, 5, 64, 255, 25, 248, 1}, + {56, 8, 17, 132, 137, 255, 55, 116, 128}, + {58, 15, 20, 82, 135, 57, 26, 121, 40}, + }, + { + {164, 50, 31, 137, 154, 133, 25, 35, 218}, + {51, 103, 44, 131, 131, 123, 31, 6, 158}, + {86, 40, 64, 135, 148, 224, 45, 183, 128}, + {22, 26, 17, 131, 240, 154, 14, 1, 209}, + {45, 16, 21, 91, 64, 222, 7, 1, 197}, + {56, 21, 39, 155, 60, 138, 23, 102, 213}, + {83, 12, 13, 54, 192, 255, 68, 47, 28}, + {85, 26, 85, 85, 128, 128, 32, 146, 171}, + {18, 11, 7, 63, 144, 171, 4, 4, 246}, + {35, 27, 10, 146, 174, 171, 12, 26, 128}, + }, + { + {190, 80, 35, 99, 180, 80, 126, 54, 45}, + {85, 126, 47, 87, 176, 51, 41, 20, 32}, + {101, 75, 128, 139, 118, 146, 116, 128, 85}, + {56, 41, 15, 176, 236, 85, 37, 9, 62}, + {71, 30, 17, 119, 118, 255, 17, 18, 138}, + {101, 38, 60, 138, 55, 70, 43, 26, 142}, + {146, 36, 19, 30, 171, 255, 97, 27, 20}, + {138, 45, 61, 62, 219, 1, 81, 188, 64}, + {32, 41, 20, 117, 151, 142, 20, 21, 163}, + {112, 19, 12, 61, 195, 128, 48, 4, 24}, + }, +} |