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1 /*
2  *  Copyright (c) 2015 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 #ifndef VPX_DSP_TXFM_COMMON_H_
12 #define VPX_DSP_TXFM_COMMON_H_
13 
14 #include "vpx_dsp/vpx_dsp_common.h"
15 
16 // Constants and Macros used by all idct/dct functions
17 #define DCT_CONST_BITS 14
18 #define DCT_CONST_ROUNDING (1 << (DCT_CONST_BITS - 1))
19 
20 #define UNIT_QUANT_SHIFT 2
21 #define UNIT_QUANT_FACTOR (1 << UNIT_QUANT_SHIFT)
22 
23 // Constants:
24 //  for (int i = 1; i< 32; ++i)
25 //    printf("static const int cospi_%d_64 = %.0f;\n", i,
26 //           round(16384 * cos(i*M_PI/64)));
27 // Note: sin(k*Pi/64) = cos((32-k)*Pi/64)
28 static const tran_coef_t cospi_1_64 = 16364;
29 static const tran_coef_t cospi_2_64 = 16305;
30 static const tran_coef_t cospi_3_64 = 16207;
31 static const tran_coef_t cospi_4_64 = 16069;
32 static const tran_coef_t cospi_5_64 = 15893;
33 static const tran_coef_t cospi_6_64 = 15679;
34 static const tran_coef_t cospi_7_64 = 15426;
35 static const tran_coef_t cospi_8_64 = 15137;
36 static const tran_coef_t cospi_9_64 = 14811;
37 static const tran_coef_t cospi_10_64 = 14449;
38 static const tran_coef_t cospi_11_64 = 14053;
39 static const tran_coef_t cospi_12_64 = 13623;
40 static const tran_coef_t cospi_13_64 = 13160;
41 static const tran_coef_t cospi_14_64 = 12665;
42 static const tran_coef_t cospi_15_64 = 12140;
43 static const tran_coef_t cospi_16_64 = 11585;
44 static const tran_coef_t cospi_17_64 = 11003;
45 static const tran_coef_t cospi_18_64 = 10394;
46 static const tran_coef_t cospi_19_64 = 9760;
47 static const tran_coef_t cospi_20_64 = 9102;
48 static const tran_coef_t cospi_21_64 = 8423;
49 static const tran_coef_t cospi_22_64 = 7723;
50 static const tran_coef_t cospi_23_64 = 7005;
51 static const tran_coef_t cospi_24_64 = 6270;
52 static const tran_coef_t cospi_25_64 = 5520;
53 static const tran_coef_t cospi_26_64 = 4756;
54 static const tran_coef_t cospi_27_64 = 3981;
55 static const tran_coef_t cospi_28_64 = 3196;
56 static const tran_coef_t cospi_29_64 = 2404;
57 static const tran_coef_t cospi_30_64 = 1606;
58 static const tran_coef_t cospi_31_64 = 804;
59 
60 //  16384 * sqrt(2) * sin(kPi/9) * 2 / 3
61 static const tran_coef_t sinpi_1_9 = 5283;
62 static const tran_coef_t sinpi_2_9 = 9929;
63 static const tran_coef_t sinpi_3_9 = 13377;
64 static const tran_coef_t sinpi_4_9 = 15212;
65 
66 #endif  // VPX_DSP_TXFM_COMMON_H_
67