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/*
* Copyright (c) 2010 The WebM project authors. All Rights Reserved.
*
* Use of this source code is governed by a BSD-style license
* that can be found in the LICENSE file in the root of the source
* tree. An additional intellectual property rights grant can be found
* in the file PATENTS. All contributing project authors may
* be found in the AUTHORS file in the root of the source tree.
*/
#ifndef VP9_COMMON_VP9_IDCT_H
#define VP9_COMMON_VP9_IDCT_H
#include "./vpx_config.h"
// Constants and Macros used by all idct/dct functions
#define DCT_CONST_BITS 14
#define DCT_CONST_ROUNDING (1 << (DCT_CONST_BITS - 1))
// Constants are round(16384 * cos(k*Pi/64)) where k = 1 to 31.
// Note: sin(k*Pi/64) = cos((32-k)*Pi/64)
static const int cospi_1_64 = 16364;
static const int cospi_2_64 = 16305;
static const int cospi_3_64 = 16207;
static const int cospi_4_64 = 16069;
static const int cospi_5_64 = 15893;
static const int cospi_6_64 = 15679;
static const int cospi_7_64 = 15426;
static const int cospi_8_64 = 15137;
static const int cospi_9_64 = 14811;
static const int cospi_10_64 = 14449;
static const int cospi_11_64 = 14053;
static const int cospi_12_64 = 13623;
static const int cospi_13_64 = 13160;
static const int cospi_14_64 = 12665;
static const int cospi_15_64 = 12140;
static const int cospi_16_64 = 11585;
static const int cospi_17_64 = 11003;
static const int cospi_18_64 = 10394;
static const int cospi_19_64 = 9760;
static const int cospi_20_64 = 9102;
static const int cospi_21_64 = 8423;
static const int cospi_22_64 = 7723;
static const int cospi_23_64 = 7005;
static const int cospi_24_64 = 6270;
static const int cospi_25_64 = 5520;
static const int cospi_26_64 = 4756;
static const int cospi_27_64 = 3981;
static const int cospi_28_64 = 3196;
static const int cospi_29_64 = 2404;
static const int cospi_30_64 = 1606;
static const int cospi_31_64 = 804;
// 16384 * sqrt(2) * sin(kPi/9) * 2 / 3
static const int sinpi_1_9 = 5283;
static const int sinpi_2_9 = 9929;
static const int sinpi_3_9 = 13377;
static const int sinpi_4_9 = 15212;
static INLINE int dct_const_round_shift(int input) {
int rv = (input + DCT_CONST_ROUNDING) >> DCT_CONST_BITS;
assert(INT16_MIN <= rv && rv <= INT16_MAX);
return rv;
}
#endif
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