83 lines
2.6 KiB
C
83 lines
2.6 KiB
C
/*
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* Copyright (c) 2010 The WebM project authors. All Rights Reserved.
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*
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* Use of this source code is governed by a BSD-style license
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* that can be found in the LICENSE file in the root of the source
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* tree. An additional intellectual property rights grant can be found
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* in the file PATENTS. All contributing project authors may
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* be found in the AUTHORS file in the root of the source tree.
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*/
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#ifndef VP9_COMMON_VP9_IDCT_H_
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#define VP9_COMMON_VP9_IDCT_H_
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#include <assert.h>
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#include "./vpx_config.h"
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#include "vpx/vpx_integer.h"
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#include "vp9/common/vp9_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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// Constants are round(16384 * cos(k*Pi/64)) where k = 1 to 31.
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// Note: sin(k*Pi/64) = cos((32-k)*Pi/64)
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static const int cospi_1_64 = 16364;
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static const int cospi_2_64 = 16305;
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static const int cospi_3_64 = 16207;
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static const int cospi_4_64 = 16069;
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static const int cospi_5_64 = 15893;
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static const int cospi_6_64 = 15679;
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static const int cospi_7_64 = 15426;
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static const int cospi_8_64 = 15137;
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static const int cospi_9_64 = 14811;
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static const int cospi_10_64 = 14449;
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static const int cospi_11_64 = 14053;
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static const int cospi_12_64 = 13623;
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static const int cospi_13_64 = 13160;
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static const int cospi_14_64 = 12665;
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static const int cospi_15_64 = 12140;
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static const int cospi_16_64 = 11585;
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static const int cospi_17_64 = 11003;
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static const int cospi_18_64 = 10394;
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static const int cospi_19_64 = 9760;
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static const int cospi_20_64 = 9102;
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static const int cospi_21_64 = 8423;
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static const int cospi_22_64 = 7723;
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static const int cospi_23_64 = 7005;
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static const int cospi_24_64 = 6270;
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static const int cospi_25_64 = 5520;
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static const int cospi_26_64 = 4756;
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static const int cospi_27_64 = 3981;
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static const int cospi_28_64 = 3196;
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static const int cospi_29_64 = 2404;
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static const int cospi_30_64 = 1606;
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static const int cospi_31_64 = 804;
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// 16384 * sqrt(2) * sin(kPi/9) * 2 / 3
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static const int sinpi_1_9 = 5283;
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static const int sinpi_2_9 = 9929;
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static const int sinpi_3_9 = 13377;
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static const int sinpi_4_9 = 15212;
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static INLINE int dct_const_round_shift(int input) {
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int rv = ROUND_POWER_OF_TWO(input, DCT_CONST_BITS);
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assert(INT16_MIN <= rv && rv <= INT16_MAX);
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return rv;
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}
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static INLINE int dct_32_round(int input) {
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int rv = ROUND_POWER_OF_TWO(input, DCT_CONST_BITS);
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assert(-131072 <= rv && rv <= 131071);
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return rv;
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}
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typedef void (*transform_1d)(int16_t*, int16_t*);
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typedef struct {
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transform_1d cols, rows; // vertical and horizontal
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} transform_2d;
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#endif // VP9_COMMON_VP9_IDCT_H_
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