The Tor Browser / file comparison
comparison: media/libvpx/vp8/common/quant_common.c
media/libvpx/vp8/common/quant_common.c
- branch
- TOR_BUG_9701
- changeset 10
- ac0c01689b40
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deleted
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| -1:000000000000 | 0:c3bf4c79006d |
|---|---|
| 1 /* | |
| 2 * Copyright (c) 2010 The WebM project authors. All Rights Reserved. | |
| 3 * | |
| 4 * Use of this source code is governed by a BSD-style license | |
| 5 * that can be found in the LICENSE file in the root of the source | |
| 6 * tree. An additional intellectual property rights grant can be found | |
| 7 * in the file PATENTS. All contributing project authors may | |
| 8 * be found in the AUTHORS file in the root of the source tree. | |
| 9 */ | |
| 10 | |
| 11 | |
| 12 #include "quant_common.h" | |
| 13 | |
| 14 static const int dc_qlookup[QINDEX_RANGE] = | |
| 15 { | |
| 16 4, 5, 6, 7, 8, 9, 10, 10, 11, 12, 13, 14, 15, 16, 17, 17, | |
| 17 18, 19, 20, 20, 21, 21, 22, 22, 23, 23, 24, 25, 25, 26, 27, 28, | |
| 18 29, 30, 31, 32, 33, 34, 35, 36, 37, 37, 38, 39, 40, 41, 42, 43, | |
| 19 44, 45, 46, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, | |
| 20 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, | |
| 21 75, 76, 76, 77, 78, 79, 80, 81, 82, 83, 84, 85, 86, 87, 88, 89, | |
| 22 91, 93, 95, 96, 98, 100, 101, 102, 104, 106, 108, 110, 112, 114, 116, 118, | |
| 23 122, 124, 126, 128, 130, 132, 134, 136, 138, 140, 143, 145, 148, 151, 154, 157, | |
| 24 }; | |
| 25 | |
| 26 static const int ac_qlookup[QINDEX_RANGE] = | |
| 27 { | |
| 28 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, | |
| 29 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, | |
| 30 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, | |
| 31 52, 53, 54, 55, 56, 57, 58, 60, 62, 64, 66, 68, 70, 72, 74, 76, | |
| 32 78, 80, 82, 84, 86, 88, 90, 92, 94, 96, 98, 100, 102, 104, 106, 108, | |
| 33 110, 112, 114, 116, 119, 122, 125, 128, 131, 134, 137, 140, 143, 146, 149, 152, | |
| 34 155, 158, 161, 164, 167, 170, 173, 177, 181, 185, 189, 193, 197, 201, 205, 209, | |
| 35 213, 217, 221, 225, 229, 234, 239, 245, 249, 254, 259, 264, 269, 274, 279, 284, | |
| 36 }; | |
| 37 | |
| 38 | |
| 39 int vp8_dc_quant(int QIndex, int Delta) | |
| 40 { | |
| 41 int retval; | |
| 42 | |
| 43 QIndex = QIndex + Delta; | |
| 44 | |
| 45 if (QIndex > 127) | |
| 46 QIndex = 127; | |
| 47 else if (QIndex < 0) | |
| 48 QIndex = 0; | |
| 49 | |
| 50 retval = dc_qlookup[ QIndex ]; | |
| 51 return retval; | |
| 52 } | |
| 53 | |
| 54 int vp8_dc2quant(int QIndex, int Delta) | |
| 55 { | |
| 56 int retval; | |
| 57 | |
| 58 QIndex = QIndex + Delta; | |
| 59 | |
| 60 if (QIndex > 127) | |
| 61 QIndex = 127; | |
| 62 else if (QIndex < 0) | |
| 63 QIndex = 0; | |
| 64 | |
| 65 retval = dc_qlookup[ QIndex ] * 2; | |
| 66 return retval; | |
| 67 | |
| 68 } | |
| 69 int vp8_dc_uv_quant(int QIndex, int Delta) | |
| 70 { | |
| 71 int retval; | |
| 72 | |
| 73 QIndex = QIndex + Delta; | |
| 74 | |
| 75 if (QIndex > 127) | |
| 76 QIndex = 127; | |
| 77 else if (QIndex < 0) | |
| 78 QIndex = 0; | |
| 79 | |
| 80 retval = dc_qlookup[ QIndex ]; | |
| 81 | |
| 82 if (retval > 132) | |
| 83 retval = 132; | |
| 84 | |
| 85 return retval; | |
| 86 } | |
| 87 | |
| 88 int vp8_ac_yquant(int QIndex) | |
| 89 { | |
| 90 int retval; | |
| 91 | |
| 92 if (QIndex > 127) | |
| 93 QIndex = 127; | |
| 94 else if (QIndex < 0) | |
| 95 QIndex = 0; | |
| 96 | |
| 97 retval = ac_qlookup[ QIndex ]; | |
| 98 return retval; | |
| 99 } | |
| 100 | |
| 101 int vp8_ac2quant(int QIndex, int Delta) | |
| 102 { | |
| 103 int retval; | |
| 104 | |
| 105 QIndex = QIndex + Delta; | |
| 106 | |
| 107 if (QIndex > 127) | |
| 108 QIndex = 127; | |
| 109 else if (QIndex < 0) | |
| 110 QIndex = 0; | |
| 111 | |
| 112 /* For all x in [0..284], x*155/100 is bitwise equal to (x*101581) >> 16. | |
| 113 * The smallest precision for that is '(x*6349) >> 12' but 16 is a good | |
| 114 * word size. */ | |
| 115 retval = (ac_qlookup[ QIndex ] * 101581) >> 16; | |
| 116 | |
| 117 if (retval < 8) | |
| 118 retval = 8; | |
| 119 | |
| 120 return retval; | |
| 121 } | |
| 122 int vp8_ac_uv_quant(int QIndex, int Delta) | |
| 123 { | |
| 124 int retval; | |
| 125 | |
| 126 QIndex = QIndex + Delta; | |
| 127 | |
| 128 if (QIndex > 127) | |
| 129 QIndex = 127; | |
| 130 else if (QIndex < 0) | |
| 131 QIndex = 0; | |
| 132 | |
| 133 retval = ac_qlookup[ QIndex ]; | |
| 134 return retval; | |
| 135 } |
