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-rw-r--r--vendor/golang.org/x/image/vp8/quant.go98
1 files changed, 98 insertions, 0 deletions
diff --git a/vendor/golang.org/x/image/vp8/quant.go b/vendor/golang.org/x/image/vp8/quant.go
new file mode 100644
index 0000000..da43616
--- /dev/null
+++ b/vendor/golang.org/x/image/vp8/quant.go
@@ -0,0 +1,98 @@
+// 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 quantization factors.
+
+// quant are DC/AC quantization factors.
+type quant struct {
+ y1 [2]uint16
+ y2 [2]uint16
+ uv [2]uint16
+}
+
+// clip clips x to the range [min, max] inclusive.
+func clip(x, min, max int32) int32 {
+ if x < min {
+ return min
+ }
+ if x > max {
+ return max
+ }
+ return x
+}
+
+// parseQuant parses the quantization factors, as specified in section 9.6.
+func (d *Decoder) parseQuant() {
+ baseQ0 := d.fp.readUint(uniformProb, 7)
+ dqy1DC := d.fp.readOptionalInt(uniformProb, 4)
+ const dqy1AC = 0
+ dqy2DC := d.fp.readOptionalInt(uniformProb, 4)
+ dqy2AC := d.fp.readOptionalInt(uniformProb, 4)
+ dquvDC := d.fp.readOptionalInt(uniformProb, 4)
+ dquvAC := d.fp.readOptionalInt(uniformProb, 4)
+ for i := 0; i < nSegment; i++ {
+ q := int32(baseQ0)
+ if d.segmentHeader.useSegment {
+ if d.segmentHeader.relativeDelta {
+ q += int32(d.segmentHeader.quantizer[i])
+ } else {
+ q = int32(d.segmentHeader.quantizer[i])
+ }
+ }
+ d.quant[i].y1[0] = dequantTableDC[clip(q+dqy1DC, 0, 127)]
+ d.quant[i].y1[1] = dequantTableAC[clip(q+dqy1AC, 0, 127)]
+ d.quant[i].y2[0] = dequantTableDC[clip(q+dqy2DC, 0, 127)] * 2
+ d.quant[i].y2[1] = dequantTableAC[clip(q+dqy2AC, 0, 127)] * 155 / 100
+ if d.quant[i].y2[1] < 8 {
+ d.quant[i].y2[1] = 8
+ }
+ // The 117 is not a typo. The dequant_init function in the spec's Reference
+ // Decoder Source Code (http://tools.ietf.org/html/rfc6386#section-9.6 Page 145)
+ // says to clamp the LHS value at 132, which is equal to dequantTableDC[117].
+ d.quant[i].uv[0] = dequantTableDC[clip(q+dquvDC, 0, 117)]
+ d.quant[i].uv[1] = dequantTableAC[clip(q+dquvAC, 0, 127)]
+ }
+}
+
+// The dequantization tables are specified in section 14.1.
+var (
+ dequantTableDC = [128]uint16{
+ 4, 5, 6, 7, 8, 9, 10, 10,
+ 11, 12, 13, 14, 15, 16, 17, 17,
+ 18, 19, 20, 20, 21, 21, 22, 22,
+ 23, 23, 24, 25, 25, 26, 27, 28,
+ 29, 30, 31, 32, 33, 34, 35, 36,
+ 37, 37, 38, 39, 40, 41, 42, 43,
+ 44, 45, 46, 46, 47, 48, 49, 50,
+ 51, 52, 53, 54, 55, 56, 57, 58,
+ 59, 60, 61, 62, 63, 64, 65, 66,
+ 67, 68, 69, 70, 71, 72, 73, 74,
+ 75, 76, 76, 77, 78, 79, 80, 81,
+ 82, 83, 84, 85, 86, 87, 88, 89,
+ 91, 93, 95, 96, 98, 100, 101, 102,
+ 104, 106, 108, 110, 112, 114, 116, 118,
+ 122, 124, 126, 128, 130, 132, 134, 136,
+ 138, 140, 143, 145, 148, 151, 154, 157,
+ }
+ dequantTableAC = [128]uint16{
+ 4, 5, 6, 7, 8, 9, 10, 11,
+ 12, 13, 14, 15, 16, 17, 18, 19,
+ 20, 21, 22, 23, 24, 25, 26, 27,
+ 28, 29, 30, 31, 32, 33, 34, 35,
+ 36, 37, 38, 39, 40, 41, 42, 43,
+ 44, 45, 46, 47, 48, 49, 50, 51,
+ 52, 53, 54, 55, 56, 57, 58, 60,
+ 62, 64, 66, 68, 70, 72, 74, 76,
+ 78, 80, 82, 84, 86, 88, 90, 92,
+ 94, 96, 98, 100, 102, 104, 106, 108,
+ 110, 112, 114, 116, 119, 122, 125, 128,
+ 131, 134, 137, 140, 143, 146, 149, 152,
+ 155, 158, 161, 164, 167, 170, 173, 177,
+ 181, 185, 189, 193, 197, 201, 205, 209,
+ 213, 217, 221, 225, 229, 234, 239, 245,
+ 249, 254, 259, 264, 269, 274, 279, 284,
+ }
+)