1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/media/libvpx/vp8/common/quant_common.c Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,135 @@
1.4 +/*
1.5 + * Copyright (c) 2010 The WebM project authors. All Rights Reserved.
1.6 + *
1.7 + * Use of this source code is governed by a BSD-style license
1.8 + * that can be found in the LICENSE file in the root of the source
1.9 + * tree. An additional intellectual property rights grant can be found
1.10 + * in the file PATENTS. All contributing project authors may
1.11 + * be found in the AUTHORS file in the root of the source tree.
1.12 + */
1.13 +
1.14 +
1.15 +#include "quant_common.h"
1.16 +
1.17 +static const int dc_qlookup[QINDEX_RANGE] =
1.18 +{
1.19 + 4, 5, 6, 7, 8, 9, 10, 10, 11, 12, 13, 14, 15, 16, 17, 17,
1.20 + 18, 19, 20, 20, 21, 21, 22, 22, 23, 23, 24, 25, 25, 26, 27, 28,
1.21 + 29, 30, 31, 32, 33, 34, 35, 36, 37, 37, 38, 39, 40, 41, 42, 43,
1.22 + 44, 45, 46, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58,
1.23 + 59, 60, 61, 62, 63, 64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74,
1.24 + 75, 76, 76, 77, 78, 79, 80, 81, 82, 83, 84, 85, 86, 87, 88, 89,
1.25 + 91, 93, 95, 96, 98, 100, 101, 102, 104, 106, 108, 110, 112, 114, 116, 118,
1.26 + 122, 124, 126, 128, 130, 132, 134, 136, 138, 140, 143, 145, 148, 151, 154, 157,
1.27 +};
1.28 +
1.29 +static const int ac_qlookup[QINDEX_RANGE] =
1.30 +{
1.31 + 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19,
1.32 + 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35,
1.33 + 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51,
1.34 + 52, 53, 54, 55, 56, 57, 58, 60, 62, 64, 66, 68, 70, 72, 74, 76,
1.35 + 78, 80, 82, 84, 86, 88, 90, 92, 94, 96, 98, 100, 102, 104, 106, 108,
1.36 + 110, 112, 114, 116, 119, 122, 125, 128, 131, 134, 137, 140, 143, 146, 149, 152,
1.37 + 155, 158, 161, 164, 167, 170, 173, 177, 181, 185, 189, 193, 197, 201, 205, 209,
1.38 + 213, 217, 221, 225, 229, 234, 239, 245, 249, 254, 259, 264, 269, 274, 279, 284,
1.39 +};
1.40 +
1.41 +
1.42 +int vp8_dc_quant(int QIndex, int Delta)
1.43 +{
1.44 + int retval;
1.45 +
1.46 + QIndex = QIndex + Delta;
1.47 +
1.48 + if (QIndex > 127)
1.49 + QIndex = 127;
1.50 + else if (QIndex < 0)
1.51 + QIndex = 0;
1.52 +
1.53 + retval = dc_qlookup[ QIndex ];
1.54 + return retval;
1.55 +}
1.56 +
1.57 +int vp8_dc2quant(int QIndex, int Delta)
1.58 +{
1.59 + int retval;
1.60 +
1.61 + QIndex = QIndex + Delta;
1.62 +
1.63 + if (QIndex > 127)
1.64 + QIndex = 127;
1.65 + else if (QIndex < 0)
1.66 + QIndex = 0;
1.67 +
1.68 + retval = dc_qlookup[ QIndex ] * 2;
1.69 + return retval;
1.70 +
1.71 +}
1.72 +int vp8_dc_uv_quant(int QIndex, int Delta)
1.73 +{
1.74 + int retval;
1.75 +
1.76 + QIndex = QIndex + Delta;
1.77 +
1.78 + if (QIndex > 127)
1.79 + QIndex = 127;
1.80 + else if (QIndex < 0)
1.81 + QIndex = 0;
1.82 +
1.83 + retval = dc_qlookup[ QIndex ];
1.84 +
1.85 + if (retval > 132)
1.86 + retval = 132;
1.87 +
1.88 + return retval;
1.89 +}
1.90 +
1.91 +int vp8_ac_yquant(int QIndex)
1.92 +{
1.93 + int retval;
1.94 +
1.95 + if (QIndex > 127)
1.96 + QIndex = 127;
1.97 + else if (QIndex < 0)
1.98 + QIndex = 0;
1.99 +
1.100 + retval = ac_qlookup[ QIndex ];
1.101 + return retval;
1.102 +}
1.103 +
1.104 +int vp8_ac2quant(int QIndex, int Delta)
1.105 +{
1.106 + int retval;
1.107 +
1.108 + QIndex = QIndex + Delta;
1.109 +
1.110 + if (QIndex > 127)
1.111 + QIndex = 127;
1.112 + else if (QIndex < 0)
1.113 + QIndex = 0;
1.114 +
1.115 + /* For all x in [0..284], x*155/100 is bitwise equal to (x*101581) >> 16.
1.116 + * The smallest precision for that is '(x*6349) >> 12' but 16 is a good
1.117 + * word size. */
1.118 + retval = (ac_qlookup[ QIndex ] * 101581) >> 16;
1.119 +
1.120 + if (retval < 8)
1.121 + retval = 8;
1.122 +
1.123 + return retval;
1.124 +}
1.125 +int vp8_ac_uv_quant(int QIndex, int Delta)
1.126 +{
1.127 + int retval;
1.128 +
1.129 + QIndex = QIndex + Delta;
1.130 +
1.131 + if (QIndex > 127)
1.132 + QIndex = 127;
1.133 + else if (QIndex < 0)
1.134 + QIndex = 0;
1.135 +
1.136 + retval = ac_qlookup[ QIndex ];
1.137 + return retval;
1.138 +}
