vp9_idct.h revision 91037db265ecdd914a26e056cf69207b4f50924e 
1/*
2 *  Copyright (c) 2010 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 VP9_COMMON_VP9_IDCT_H_
12#define VP9_COMMON_VP9_IDCT_H_
13
14#include <assert.h>
15
16#include "./vpx_config.h"
17#include "vpx/vpx_integer.h"
18#include "vp9/common/vp9_common.h"
19
20
21// Constants and Macros used by all idct/dct functions
22#define DCT_CONST_BITS 14
23#define DCT_CONST_ROUNDING  (1 << (DCT_CONST_BITS - 1))
24
25#define WHT_UPSCALE_FACTOR 2
26
27#define pair_set_epi16(a, b) \
28  _mm_set1_epi32(((uint16_t)(a)) + (((uint16_t)(b)) << 16))
29
30// Constants:
31//  for (int i = 1; i< 32; ++i)
32//    printf("static const int cospi_%d_64 = %.0f;\n", i,
33//           round(16384 * cos(i*M_PI/64)));
34// Note: sin(k*Pi/64) = cos((32-k)*Pi/64)
35static const int cospi_1_64  = 16364;
36static const int cospi_2_64  = 16305;
37static const int cospi_3_64  = 16207;
38static const int cospi_4_64  = 16069;
39static const int cospi_5_64  = 15893;
40static const int cospi_6_64  = 15679;
41static const int cospi_7_64  = 15426;
42static const int cospi_8_64  = 15137;
43static const int cospi_9_64  = 14811;
44static const int cospi_10_64 = 14449;
45static const int cospi_11_64 = 14053;
46static const int cospi_12_64 = 13623;
47static const int cospi_13_64 = 13160;
48static const int cospi_14_64 = 12665;
49static const int cospi_15_64 = 12140;
50static const int cospi_16_64 = 11585;
51static const int cospi_17_64 = 11003;
52static const int cospi_18_64 = 10394;
53static const int cospi_19_64 = 9760;
54static const int cospi_20_64 = 9102;
55static const int cospi_21_64 = 8423;
56static const int cospi_22_64 = 7723;
57static const int cospi_23_64 = 7005;
58static const int cospi_24_64 = 6270;
59static const int cospi_25_64 = 5520;
60static const int cospi_26_64 = 4756;
61static const int cospi_27_64 = 3981;
62static const int cospi_28_64 = 3196;
63static const int cospi_29_64 = 2404;
64static const int cospi_30_64 = 1606;
65static const int cospi_31_64 = 804;
66
67//  16384 * sqrt(2) * sin(kPi/9) * 2 / 3
68static const int sinpi_1_9 = 5283;
69static const int sinpi_2_9 = 9929;
70static const int sinpi_3_9 = 13377;
71static const int sinpi_4_9 = 15212;
72
73static INLINE int dct_const_round_shift(int input) {
74  int rv = ROUND_POWER_OF_TWO(input, DCT_CONST_BITS);
75  assert(INT16_MIN <= rv && rv <= INT16_MAX);
76  return rv;
77}
78
79typedef void (*transform_1d)(int16_t*, int16_t*);
80
81typedef struct {
82  transform_1d cols, rows;  // vertical and horizontal
83} transform_2d;
84
85#endif  // VP9_COMMON_VP9_IDCT_H_
86