1/*
2 * Copyright (C) 2004-2010 NXP Software
3 * Copyright (C) 2010 The Android Open Source Project
4 *
5 * Licensed under the Apache License, Version 2.0 (the "License");
6 * you may not use this file except in compliance with the License.
7 * You may obtain a copy of the License at
8 *
9 *      http://www.apache.org/licenses/LICENSE-2.0
10 *
11 * Unless required by applicable law or agreed to in writing, software
12 * distributed under the License is distributed on an "AS IS" BASIS,
13 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14 * See the License for the specific language governing permissions and
15 * limitations under the License.
16 */
17
18#ifndef _FILTER_H_
19#define _FILTER_H_
20
21#ifdef __cplusplus
22extern "C" {
23#endif /* __cplusplus */
24
25/**********************************************************************************
26   INCLUDES
27***********************************************************************************/
28#include "LVM_Types.h"
29#include "BIQUAD.h"
30
31
32/**********************************************************************************
33   DEFINES
34***********************************************************************************/
35#define FILTER_LOSS     32730       /* -0.01dB loss to avoid wrapping due to band ripple */
36#ifdef BUILD_FLOAT
37#define FILTER_LOSS_FLOAT    0.998849f
38#endif
39/**********************************************************************************
40   FUNCTION PROTOTYPES
41***********************************************************************************/
42#ifdef BUILD_FLOAT
43
44LVM_FLOAT LVM_Power10(   LVM_FLOAT  X);
45
46LVM_FLOAT LVM_Polynomial(LVM_UINT16 N,
47                         LVM_FLOAT  *pCoefficients,
48                         LVM_FLOAT  X);
49#ifdef HIGHER_FS
50LVM_FLOAT   LVM_GetOmega(LVM_UINT32  Fc,
51#else
52LVM_FLOAT   LVM_GetOmega(LVM_UINT16  Fc,
53#endif
54                         LVM_Fs_en   SampleRate);
55
56LVM_FLOAT LVM_FO_LPF(    LVM_FLOAT  w,
57                         FO_FLOAT_Coefs_t  *pCoeffs);
58
59LVM_FLOAT LVM_FO_HPF(    LVM_FLOAT  w,
60                         FO_FLOAT_Coefs_t  *pCoeffs);
61#else
62LVM_INT32 LVM_Polynomial(LVM_UINT16 N,
63                         LVM_INT32  *pCoefficients,
64                         LVM_INT32  X);
65
66LVM_INT32 LVM_Power10(   LVM_INT32  X);
67
68LVM_INT32 LVM_FO_LPF(    LVM_INT32  w,
69                         FO_C32_Coefs_t  *pCoeffs);
70
71LVM_INT32 LVM_FO_HPF(    LVM_INT32  w,
72                         FO_C32_Coefs_t  *pCoeffs);
73
74LVM_INT32   LVM_GetOmega(LVM_UINT16  Fc,
75                         LVM_Fs_en   SampleRate);
76#endif
77/**********************************************************************************/
78#ifdef __cplusplus
79}
80#endif /* __cplusplus */
81
82#endif  /** _FILTER_H_ **/
83
84