LVPSA_QPD.h revision d918324d44aa48b3b064ea9b87d0c520c38f15a9 
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 _LVPSA_QPD_H_
19#define _LVPSA_QPD_H_
20
21#include "LVM_Types.h"
22
23
24#ifdef __cplusplus
25extern "C" {
26#endif /* __cplusplus */
27
28typedef struct
29{
30  LVM_INT32                            *pDelay;        /* pointer to the delayed samples (data of 32 bits)   */
31  LVM_INT32                            Coefs[2];       /* pointer to the filter coefficients */
32}QPD_State_t, *pQPD_State_t;
33
34typedef struct
35{
36    LVM_INT32 KP;    /*should store a0*/
37    LVM_INT32 KM;    /*should store b2*/
38
39} QPD_C32_Coefs, *PQPD_C32_Coefs;
40
41typedef struct
42{
43    LVM_INT32 Storage[1];
44
45} QPD_Taps_t, *pQPD_Taps_t;
46
47/************************************************************************************/
48/*                                                                                  */
49/* FUNCTION:            LVPSA_QPD_Process                                           */
50/*                                                                                  */
51/* DESCRIPTION:                                                                     */
52/*  Apply downsampling, post gain, quasi peak filtering and write the levels values */
53/*  in the buffer every 20 ms.                                                      */
54/*                                                                                  */
55/* PARAMETERS:                                                                      */
56/*                                                                                  */
57/* RETURNS:             void                                                        */
58/*                                                                                  */
59/************************************************************************************/
60void LVPSA_QPD_Process (            void                               *hInstance,
61                                    LVM_INT16                          *pInSamps,
62                                    LVM_INT16                           numSamples,
63                                    LVM_INT16                           BandIndex);
64
65/************************************************************************************/
66/*                                                                                  */
67/* FUNCTION:            LVPSA_QPD_Init                                              */
68/*                                                                                  */
69/* DESCRIPTION:                                                                     */
70/*  Initialize a quasi peak filter instance.                                        */
71/*                                                                                  */
72/* PARAMETERS:                                                                      */
73/*  pInstance           Pointer to the instance                                     */
74/*   pTaps               Pointer to the filter's taps                               */
75/*   pCoef               Pointer to the filter's coefficients                       */
76/*                                                                                  */
77/* RETURNS:     void                                                                */
78/*                                                                                  */
79/************************************************************************************/
80void LVPSA_QPD_Init (   QPD_State_t       *pInstance,
81                        QPD_Taps_t        *pTaps,
82                        QPD_C32_Coefs     *pCoef     );
83
84
85#ifdef __cplusplus
86}
87#endif /* __cplusplus */
88
89#endif
90
91