mh_det.h - Android社区 - https://www.androidos.net.cn/

/* -----------------------------------------------------------------------------------------------------------
Software License for The Fraunhofer FDK AAC Codec Library for Android

1.    INTRODUCTION
The Fraunhofer FDK AAC Codec Library for Android ("FDK AAC Codec") is software that implements
the MPEG Advanced Audio Coding ("AAC") encoding and decoding scheme for digital audio.
This FDK AAC Codec software is intended to be used on a wide variety of Android devices.

AAC's HE-AAC and HE-AAC v2 versions are regarded as today's most efficient general perceptual
audio codecs. AAC-ELD is considered the best-performing full-bandwidth communications codec by
independent studies and is widely deployed. AAC has been standardized by ISO and IEC as part
of the MPEG specifications.

Patent licenses for necessary patent claims for the FDK AAC Codec (including those of Fraunhofer)
may be obtained through Via Licensing (www.vialicensing.com) or through the respective patent owners
individually for the purpose of encoding or decoding bit streams in products that are compliant with
the ISO/IEC MPEG audio standards. Please note that most manufacturers of Android devices already license
these patent claims through Via Licensing or directly from the patent owners, and therefore FDK AAC Codec
software may already be covered under those patent licenses when it is used for those licensed purposes only.

Commercially-licensed AAC software libraries, including floating-point versions with enhanced sound quality,
are also available from Fraunhofer. Users are encouraged to check the Fraunhofer website for additional
applications information and documentation.

2.    COPYRIGHT LICENSE

Redistribution and use in source and binary forms, with or without modification, are permitted without
payment of copyright license fees provided that you satisfy the following conditions:

You must retain the complete text of this software license in redistributions of the FDK AAC Codec or
your modifications thereto in source code form.

You must retain the complete text of this software license in the documentation and/or other materials
provided with redistributions of the FDK AAC Codec or your modifications thereto in binary form.
You must make available free of charge copies of the complete source code of the FDK AAC Codec and your
modifications thereto to recipients of copies in binary form.

The name of Fraunhofer may not be used to endorse or promote products derived from this library without
prior written permission.

You may not charge copyright license fees for anyone to use, copy or distribute the FDK AAC Codec
software or your modifications thereto.

Your modified versions of the FDK AAC Codec must carry prominent notices stating that you changed the software
and the date of any change. For modified versions of the FDK AAC Codec, the term
"Fraunhofer FDK AAC Codec Library for Android" must be replaced by the term
"Third-Party Modified Version of the Fraunhofer FDK AAC Codec Library for Android."

3.    NO PATENT LICENSE

NO EXPRESS OR IMPLIED LICENSES TO ANY PATENT CLAIMS, including without limitation the patents of Fraunhofer,
ARE GRANTED BY THIS SOFTWARE LICENSE. Fraunhofer provides no warranty of patent non-infringement with
respect to this software.

You may use this FDK AAC Codec software or modifications thereto only for purposes that are authorized
by appropriate patent licenses.

4.    DISCLAIMER

This FDK AAC Codec software is provided by Fraunhofer on behalf of the copyright holders and contributors
"AS IS" and WITHOUT ANY EXPRESS OR IMPLIED WARRANTIES, including but not limited to the implied warranties
of merchantability and fitness for a particular purpose. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
CONTRIBUTORS BE LIABLE for any direct, indirect, incidental, special, exemplary, or consequential damages,
including but not limited to procurement of substitute goods or services; loss of use, data, or profits,
or business interruption, however caused and on any theory of liability, whether in contract, strict
liability, or tort (including negligence), arising in any way out of the use of this software, even if
advised of the possibility of such damage.

5.    CONTACT INFORMATION

Fraunhofer Institute for Integrated Circuits IIS
Attention: Audio and Multimedia Departments - FDK AAC LL
Am Wolfsmantel 33
91058 Erlangen, Germany

www.iis.fraunhofer.de/amm
amm-info@iis.fraunhofer.de
----------------------------------------------------------------------------------------------------------- */

/*!
  \file
  \brief  missing harmonics detection header file  
*/

#ifndef __MH_DETECT_H
#define __MH_DETECT_H

#include "sbr_encoder.h"
#include "fram_gen.h"

typedef struct
{
  FIXP_DBL thresHoldDiff;      /*!< threshold for tonality difference */
  FIXP_DBL thresHoldDiffGuide; /*!< threshold for tonality difference for the guide */
  FIXP_DBL thresHoldTone;      /*!< threshold for tonality for a sine */
  FIXP_DBL invThresHoldTone;
  FIXP_DBL thresHoldToneGuide; /*!< threshold for tonality for a sine for the guide */
  FIXP_DBL sfmThresSbr;        /*!< tonality flatness measure threshold for the SBR signal.*/
  FIXP_DBL sfmThresOrig;       /*!< tonality flatness measure threshold for the original signal.*/
  FIXP_DBL decayGuideOrig;     /*!< decay value of the tonality value of the guide for the tone. */
  FIXP_DBL decayGuideDiff;     /*!< decay value of the tonality value of the guide for the tonality difference. */
  FIXP_DBL derivThresMaxLD64;      /*!< threshold for detecting LP character in a signal. */
  FIXP_DBL derivThresBelowLD64;    /*!< threshold for detecting LP character in a signal. */
  FIXP_DBL derivThresAboveLD64;    /*!< threshold for detecting LP character in a signal. */
}THRES_HOLDS;

typedef struct
{
  INT deltaTime;            /*!< maximum allowed transient distance (from frame border in number of qmf subband sample)
                                 for a frame to be considered a transient frame.*/
  THRES_HOLDS thresHolds;   /*!< the thresholds used for detection. */
  INT maxComp;              /*!< maximum alllowed compensation factor for the envelope data. */
}DETECTOR_PARAMETERS_MH;

typedef struct
{
  FIXP_DBL *guideVectorDiff;
  FIXP_DBL *guideVectorOrig;
  UCHAR* guideVectorDetected;
}GUIDE_VECTORS;

typedef struct
{
  INT qmfNoChannels;
  INT nSfb;
  INT sampleFreq;
  INT previousTransientFlag;
  INT previousTransientFrame;
  INT previousTransientPos;

INT noVecPerFrame;
  INT transientPosOffset;

INT move;
  INT totNoEst;
  INT noEstPerFrame;
  INT timeSlots;

UCHAR *guideScfb;
  UCHAR *prevEnvelopeCompensation;
  UCHAR *detectionVectors[MAX_NO_OF_ESTIMATES];
  FIXP_DBL tonalityDiff[MAX_NO_OF_ESTIMATES/2][MAX_FREQ_COEFFS];
  FIXP_DBL sfmOrig[MAX_NO_OF_ESTIMATES/2][MAX_FREQ_COEFFS];
  FIXP_DBL sfmSbr[MAX_NO_OF_ESTIMATES/2][MAX_FREQ_COEFFS];
  const DETECTOR_PARAMETERS_MH *mhParams;
  GUIDE_VECTORS guideVectors[MAX_NO_OF_ESTIMATES];
}
SBR_MISSING_HARMONICS_DETECTOR;

typedef SBR_MISSING_HARMONICS_DETECTOR *HANDLE_SBR_MISSING_HARMONICS_DETECTOR;

void
FDKsbrEnc_SbrMissingHarmonicsDetectorQmf(HANDLE_SBR_MISSING_HARMONICS_DETECTOR h_sbrMissingHarmonicsDetector,
                               FIXP_DBL ** pQuotaBuffer,
                               INT ** pSignBuffer,
                               SCHAR *indexVector,
                               const SBR_FRAME_INFO *pFrameInfo,
                               const UCHAR* pTranInfo,
                               INT* pAddHarmonicsFlag,
                               UCHAR* pAddHarmonicsScaleFactorBands,
                               const UCHAR* freqBandTable,
                               INT nSfb,
                               UCHAR * envelopeCompensation,
                               FIXP_DBL *pNrgVector);

INT
FDKsbrEnc_CreateSbrMissingHarmonicsDetector (
                                   HANDLE_SBR_MISSING_HARMONICS_DETECTOR hSbrMHDet,
                                   INT chan);

INT
FDKsbrEnc_InitSbrMissingHarmonicsDetector(
                                  HANDLE_SBR_MISSING_HARMONICS_DETECTOR h_sbrMissingHarmonicsDetector,
                                  INT sampleFreq,
                                  INT frameSize,
                                  INT nSfb,
                                  INT qmfNoChannels,
                                  INT totNoEst,
                                  INT move,
                                  INT noEstPerFrame,
                                  UINT sbrSyntaxFlags);

void
FDKsbrEnc_DeleteSbrMissingHarmonicsDetector (HANDLE_SBR_MISSING_HARMONICS_DETECTOR h_sbrMissingHarmonicsDetector);

INT
FDKsbrEnc_ResetSbrMissingHarmonicsDetector (HANDLE_SBR_MISSING_HARMONICS_DETECTOR hSbrMissingHarmonicsDetector,
                                   INT nSfb);

#endif

C++程序 | 197行 | 8.75 KB

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