reverb_filter.h

audio-video-codecs.rar语音编解码器

/*//////////////////////////////////////////////////////////////////////////////
//
//                  INTEL CORPORATION PROPRIETARY INFORMATION
//     This software is supplied under the terms of a license agreement or
//     nondisclosure agreement with Intel Corporation and may not be copied
//     or disclosed except in accordance with the terms of that agreement.
//          Copyright(c) 2005-2006 Intel Corporation. All Rights Reserved.
//
*/

/* Standard IPP headers */
#include        "ipps.h"

/* Platform configuration */
//#include      "ippac.h"

#ifndef __REVERB_FILTER_H__
#define __REVERB_FILTER_H__

#ifdef __cplusplus
extern "C" {
#endif

/************************
 General Constants
*************************/
#define FIR_NZTAP_NUM       19    /* amount of non-zero taps for FIR filter */
#define COMB_NUM            6     /*  num of comb filters */

#define COMBNZTAPSLEN1      2     /* 2+2 tap comb filter */
#define COMBNZTAPSLEN2      2
#define APNZTAPSLEN1        2     /* 2+1 tap allpass filter */
#define APNZTAPSLEN2        1

#define ALLPASS_GAIN        0.7f  /*  gain for allpass filter */
#define ALLPASS_DELAY       6     /*  delay for allpass filter (in ms) */

/***********************
 Reverberation State Variable
************************/
typedef struct {
  Ipp32f scale;
  Ipp8u *pData[2];
  IppsFIRSparseState_32f *pState[2];
  Ipp32s FIRTapPos[FIR_NZTAP_NUM];
} FIRInfo;

typedef struct {
  Ipp32s sLen;
  Ipp32s dLen;
  Ipp8u *pData[2];
  IppsIIRSparseState_32f *pState[2];
  Ipp32f pNZTaps[COMBNZTAPSLEN1 + COMBNZTAPSLEN2];
  Ipp32s pNZTapPos[COMBNZTAPSLEN1 + COMBNZTAPSLEN2];
  Ipp32f g1;
  Ipp32f g2;     //  G(1 - g1)
} COMBInfo;

typedef struct {
  Ipp32s len;
  Ipp8u *pData[2];
  IppsIIRSparseState_32f *pState[2];
  Ipp32f pNZTaps[APNZTAPSLEN1 + APNZTAPSLEN2];
  Ipp32s pNZTapPos[APNZTAPSLEN1 + APNZTAPSLEN2];
} APInfo;

typedef struct
{
  Ipp32s maxFrameLen;      /* max length of the frame */
  Ipp32f decayTime;
  bool eReflect;           /* early reflections */
  bool lReflect;           /* late echoes */
  Ipp32f eReflectScale;    /* scale factor for early reflections */
  Ipp32f lReflectScale;    /* scale factor for late echoes */
  Ipp32f outputLevel;      /* magnifier of output signal */
  FIRInfo fir;
  COMBInfo comb[COMB_NUM];
  APInfo allpass;
  Ipp32s fullDelayLineLen;
  Ipp32f *pFullDelayLine[2];
  Ipp32f *pSumBuf;
  Ipp32f *pCombBuf;
  Ipp32s delay;
} ReverbState;

typedef struct
{
  Ipp32s nChannels;
  Ipp32s sRate;
} FileInfo;

#ifdef __cplusplus
}
#endif

#endif /* __REVERB_FILTER_H__ */