vpx_dsp/txfm_common.h

   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_high_t cospi_1_64  = 16364;
  29 static const tran_high_t cospi_2_64  = 16305;
  30 static const tran_high_t cospi_3_64  = 16207;
  31 static const tran_high_t cospi_4_64  = 16069;
  32 static const tran_high_t cospi_5_64  = 15893;
  33 static const tran_high_t cospi_6_64  = 15679;
  34 static const tran_high_t cospi_7_64  = 15426;
  35 static const tran_high_t cospi_8_64  = 15137;
  36 static const tran_high_t cospi_9_64  = 14811;
  37 static const tran_high_t cospi_10_64 = 14449;
  38 static const tran_high_t cospi_11_64 = 14053;
  39 static const tran_high_t cospi_12_64 = 13623;
  40 static const tran_high_t cospi_13_64 = 13160;
  41 static const tran_high_t cospi_14_64 = 12665;
  42 static const tran_high_t cospi_15_64 = 12140;
  43 static const tran_high_t cospi_16_64 = 11585;
  44 static const tran_high_t cospi_17_64 = 11003;
  45 static const tran_high_t cospi_18_64 = 10394;
  46 static const tran_high_t cospi_19_64 = 9760;
  47 static const tran_high_t cospi_20_64 = 9102;
  48 static const tran_high_t cospi_21_64 = 8423;
  49 static const tran_high_t cospi_22_64 = 7723;
  50 static const tran_high_t cospi_23_64 = 7005;
  51 static const tran_high_t cospi_24_64 = 6270;
  52 static const tran_high_t cospi_25_64 = 5520;
  53 static const tran_high_t cospi_26_64 = 4756;
  54 static const tran_high_t cospi_27_64 = 3981;
  55 static const tran_high_t cospi_28_64 = 3196;
  56 static const tran_high_t cospi_29_64 = 2404;
  57 static const tran_high_t cospi_30_64 = 1606;
  58 static const tran_high_t cospi_31_64 = 804;
  59
  60 //  16384 * sqrt(2) * sin(kPi/9) * 2 / 3
  61 static const tran_high_t sinpi_1_9 = 5283;
  62 static const tran_high_t sinpi_2_9 = 9929;
  63 static const tran_high_t sinpi_3_9 = 13377;
  64 static const tran_high_t sinpi_4_9 = 15212;
  65
  66 #endif  // VPX_DSP_TXFM_COMMON_H_