103 строки
3.9 KiB
C
103 строки
3.9 KiB
C
/*
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* Copyright (c) 2016, Alliance for Open Media. All rights reserved
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*
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* This source code is subject to the terms of the BSD 2 Clause License and
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* the Alliance for Open Media Patent License 1.0. If the BSD 2 Clause License
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* was not distributed with this source code in the LICENSE file, you can
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* obtain it at www.aomedia.org/license/software. If the Alliance for Open
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* Media Patent License 1.0 was not distributed with this source code in the
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* PATENTS file, you can obtain it at www.aomedia.org/license/patent.
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*/
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#ifndef AOM_DSP_TXFM_COMMON_H_
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#define AOM_DSP_TXFM_COMMON_H_
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#include "aom_dsp/aom_dsp_common.h"
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// Constants and Macros used by all idct/dct functions
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#define DCT_CONST_BITS 14
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#define DCT_CONST_ROUNDING (1 << (DCT_CONST_BITS - 1))
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#define UNIT_QUANT_SHIFT 2
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#define UNIT_QUANT_FACTOR (1 << UNIT_QUANT_SHIFT)
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// Constants:
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// for (int i = 1; i< 32; ++i)
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// printf("static const int cospi_%d_64 = %.0f;\n", i,
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// round(16384 * cos(i*M_PI/64)));
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// Note: sin(k*Pi/64) = cos((32-k)*Pi/64)
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static const tran_high_t cospi_1_64 = 16364;
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static const tran_high_t cospi_2_64 = 16305;
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static const tran_high_t cospi_3_64 = 16207;
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static const tran_high_t cospi_4_64 = 16069;
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static const tran_high_t cospi_5_64 = 15893;
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static const tran_high_t cospi_6_64 = 15679;
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static const tran_high_t cospi_7_64 = 15426;
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static const tran_high_t cospi_8_64 = 15137;
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static const tran_high_t cospi_9_64 = 14811;
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static const tran_high_t cospi_10_64 = 14449;
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static const tran_high_t cospi_11_64 = 14053;
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static const tran_high_t cospi_12_64 = 13623;
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static const tran_high_t cospi_13_64 = 13160;
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static const tran_high_t cospi_14_64 = 12665;
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static const tran_high_t cospi_15_64 = 12140;
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static const tran_high_t cospi_16_64 = 11585;
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static const tran_high_t cospi_17_64 = 11003;
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static const tran_high_t cospi_18_64 = 10394;
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static const tran_high_t cospi_19_64 = 9760;
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static const tran_high_t cospi_20_64 = 9102;
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static const tran_high_t cospi_21_64 = 8423;
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static const tran_high_t cospi_22_64 = 7723;
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static const tran_high_t cospi_23_64 = 7005;
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static const tran_high_t cospi_24_64 = 6270;
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static const tran_high_t cospi_25_64 = 5520;
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static const tran_high_t cospi_26_64 = 4756;
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static const tran_high_t cospi_27_64 = 3981;
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static const tran_high_t cospi_28_64 = 3196;
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static const tran_high_t cospi_29_64 = 2404;
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static const tran_high_t cospi_30_64 = 1606;
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static const tran_high_t cospi_31_64 = 804;
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// 16384 * sqrt(2) * sin(kPi/9) * 2 / 3
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static const tran_high_t sinpi_1_9 = 5283;
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static const tran_high_t sinpi_2_9 = 9929;
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static const tran_high_t sinpi_3_9 = 13377;
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static const tran_high_t sinpi_4_9 = 15212;
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// 16384 * sqrt(2)
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static const tran_high_t Sqrt2 = 23170;
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static INLINE tran_high_t fdct_round_shift(tran_high_t input) {
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tran_high_t rv = ROUND_POWER_OF_TWO(input, DCT_CONST_BITS);
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return rv;
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}
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#if CONFIG_LGT
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// LGT4--a modified ADST4
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// LGT4 name: lgt4_160
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// Self loops: 1.600, 0.000, 0.000, 0.000
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// Edges: 1.000, 1.000, 1.000
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static const tran_high_t lgtbasis4[4][4] = {
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{ 3809, 9358, 13567, 15834 },
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{ 10673, 15348, 2189, -13513 },
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{ 15057, -157, -14961, 9290 },
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{ 13481, -14619, 11144, -4151 },
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};
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// LGT8--a modified ADST8
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// LGT8 name: lgt8_170
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// Self loops: 1.700, 0.000, 0.000, 0.000, 0.000, 0.000, 0.000, 0.000
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// Edges: 1.000, 1.000, 1.000, 1.000, 1.000, 1.000, 1.000
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static const tran_high_t lgtbasis8[8][8] = {
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{ 1858, 4947, 7850, 10458, 12672, 14411, 15607, 16217 },
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{ 5494, 13022, 16256, 14129, 7343, -1864, -10456, -15601 },
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{ 8887, 16266, 9500, -5529, -15749, -12273, 1876, 14394 },
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{ 11870, 13351, -6199, -15984, -590, 15733, 7273, -12644 },
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{ 14248, 5137, -15991, 291, 15893, -5685, -13963, 10425 },
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{ 15716, -5450, -10010, 15929, -6665, -8952, 16036, -7835 },
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{ 15533, -13869, 6559, 3421, -12009, 15707, -13011, 5018 },
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{ 11357, -13726, 14841, -14600, 13025, -10259, 6556, -2254 },
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};
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#endif // CONFIG_LGT
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#endif // AOM_DSP_TXFM_COMMON_H_
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