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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