| /* |
| * Copyright (c) 2010 The WebM project authors. All Rights Reserved. |
| * |
| * Use of this source code is governed by a BSD-style license |
| * that can be found in the LICENSE file in the root of the source |
| * tree. An additional intellectual property rights grant can be found |
| * in the file PATENTS. All contributing project authors may |
| * be found in the AUTHORS file in the root of the source tree. |
| */ |
| |
| #ifndef VP9_COMMON_VP9_IDCT_H_ |
| #define VP9_COMMON_VP9_IDCT_H_ |
| |
| #include <assert.h> |
| |
| #include "./vpx_config.h" |
| #include "vpx/vpx_integer.h" |
| #include "vp9/common/vp9_common.h" |
| |
| |
| // Constants and Macros used by all idct/dct functions |
| #define DCT_CONST_BITS 14 |
| #define DCT_CONST_ROUNDING (1 << (DCT_CONST_BITS - 1)) |
| |
| #define pair_set_epi16(a, b) \ |
| _mm_set1_epi32(((uint16_t)(a)) + (((uint16_t)(b)) << 16)) |
| |
| // Constants are round(16384 * cos(k*Pi/64)) where k = 1 to 31. |
| // Note: sin(k*Pi/64) = cos((32-k)*Pi/64) |
| static const int cospi_1_64 = 16364; |
| static const int cospi_2_64 = 16305; |
| static const int cospi_3_64 = 16207; |
| static const int cospi_4_64 = 16069; |
| static const int cospi_5_64 = 15893; |
| static const int cospi_6_64 = 15679; |
| static const int cospi_7_64 = 15426; |
| static const int cospi_8_64 = 15137; |
| static const int cospi_9_64 = 14811; |
| static const int cospi_10_64 = 14449; |
| static const int cospi_11_64 = 14053; |
| static const int cospi_12_64 = 13623; |
| static const int cospi_13_64 = 13160; |
| static const int cospi_14_64 = 12665; |
| static const int cospi_15_64 = 12140; |
| static const int cospi_16_64 = 11585; |
| static const int cospi_17_64 = 11003; |
| static const int cospi_18_64 = 10394; |
| static const int cospi_19_64 = 9760; |
| static const int cospi_20_64 = 9102; |
| static const int cospi_21_64 = 8423; |
| static const int cospi_22_64 = 7723; |
| static const int cospi_23_64 = 7005; |
| static const int cospi_24_64 = 6270; |
| static const int cospi_25_64 = 5520; |
| static const int cospi_26_64 = 4756; |
| static const int cospi_27_64 = 3981; |
| static const int cospi_28_64 = 3196; |
| static const int cospi_29_64 = 2404; |
| static const int cospi_30_64 = 1606; |
| static const int cospi_31_64 = 804; |
| |
| // 16384 * sqrt(2) * sin(kPi/9) * 2 / 3 |
| static const int sinpi_1_9 = 5283; |
| static const int sinpi_2_9 = 9929; |
| static const int sinpi_3_9 = 13377; |
| static const int sinpi_4_9 = 15212; |
| |
| static INLINE int dct_const_round_shift(int input) { |
| int rv = ROUND_POWER_OF_TWO(input, DCT_CONST_BITS); |
| assert(INT16_MIN <= rv && rv <= INT16_MAX); |
| return rv; |
| } |
| |
| static INLINE int dct_32_round(int input) { |
| int rv = ROUND_POWER_OF_TWO(input, DCT_CONST_BITS); |
| assert(-131072 <= rv && rv <= 131071); |
| return rv; |
| } |
| |
| typedef void (*transform_1d)(int16_t*, int16_t*); |
| |
| typedef struct { |
| transform_1d cols, rows; // vertical and horizontal |
| } transform_2d; |
| |
| #endif // VP9_COMMON_VP9_IDCT_H_ |