ton_corr.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  General tonality correction detector module.
*/
#ifndef _TON_CORR_EST_H
#define _TON_CORR_EST_H

#include "sbr_encoder.h"
#include "mh_det.h"
#include "nf_est.h"
#include "invf_est.h"

#define MAX_NUM_PATCHES 6
#define SCALE_NRGVEC 4

/** parameter set for one single patch */
typedef struct {
  INT    sourceStartBand;         /*!< first band in lowbands where to take the samples from */
  INT    sourceStopBand;          /*!< first band in lowbands which is not included in the patch anymore */
  INT    guardStartBand;          /*!< first band in highbands to be filled with zeros in order to
                                         reduce interferences between patches */
  INT    targetStartBand;         /*!< first band in highbands to be filled with whitened lowband signal */
  INT    targetBandOffs;          /*!< difference between 'startTargetBand' and 'startSourceBand' */
  INT    numBandsInPatch;         /*!< number of consecutive bands in this one patch */
} PATCH_PARAM;

typedef struct
{
  INT switchInverseFilt;          /*!< Flag to enable dynamic adaption of invf. detection */
  INT noQmfChannels;
  INT bufferLength;               /*!< Length of the r and i buffers. */
  INT stepSize;                   /*!< Stride for the lpc estimate. */
  INT numberOfEstimates;          /*!< The total number of estiamtes, available in the quotaMatrix.*/
  INT numberOfEstimatesPerFrame;  /*!< The number of estimates per frame available in the quotaMatrix.*/
  INT lpcLength[2];               /*!< Segment length used for second order LPC analysis.*/
  INT nextSample;                 /*!< Where to start the LPC analysis of the current frame.*/
  INT move;                       /*!< How many estimates to move in the quotaMatrix, when buffering. */
  INT frameStartIndex;            /*!< The start index for the current frame in the r and i buffers. */
  INT startIndexMatrix;           /*!< The start index for the current frame in the quotaMatrix. */
  INT frameStartIndexInvfEst;     /*!< The start index of the inverse filtering, not the same as the others,
                                       dependent on what decoder is used (buffer opt, or no buffer opt). */
  INT prevTransientFlag;          /*!< The transisent flag (from the transient detector) for the previous frame. */
  INT transientNextFrame;         /*!< Flag to indicate that the transient will show up in the next frame. */
  INT transientPosOffset;         /*!< An offset value to match the transient pos as calculated by the transient detector
                                       with the actual position in the frame.*/

INT *signMatrix[MAX_NO_OF_ESTIMATES];      /*!< Matrix holding the sign of each channe, i.e. indicating in what
                                                  part of a QMF channel a possible sine is. */

FIXP_DBL *quotaMatrix[MAX_NO_OF_ESTIMATES];/*!< Matrix holding the quota values for all estimates, all channels. */

FIXP_DBL nrgVector[MAX_NO_OF_ESTIMATES];   /*!< Vector holding the averaged energies for every QMF band. */
  FIXP_DBL nrgVectorFreq[QMF_CHANNELS];      /*!< Vector holding the averaged energies for every QMF channel */

SCHAR indexVector[QMF_CHANNELS];           /*!< Index vector poINTing to the correct lowband channel,
                                                  when indexing a highband channel, -1 represents a guard band */
  PATCH_PARAM  patchParam[MAX_NUM_PATCHES];  /*!< new parameter set for patching */
  INT    guard;                              /*!< number of guardbands between every patch */
  INT    shiftStartSb;                       /*!< lowest subband of source range to be included in the patches */
  INT    noOfPatches;                        /*!< number of patches */

SBR_MISSING_HARMONICS_DETECTOR sbrMissingHarmonicsDetector;  /*!< SBR_MISSING_HARMONICS_DETECTOR struct. */
  SBR_NOISE_FLOOR_ESTIMATE sbrNoiseFloorEstimate;              /*!< SBR_NOISE_FLOOR_ESTIMATE struct. */
  SBR_INV_FILT_EST sbrInvFilt;                                 /*!< SBR_INV_FILT_EST struct. */
}
SBR_TON_CORR_EST;

typedef SBR_TON_CORR_EST *HANDLE_SBR_TON_CORR_EST;

void
FDKsbrEnc_TonCorrParamExtr(HANDLE_SBR_TON_CORR_EST hTonCorr,   /*!< Handle to SBR_TON_CORR struct. */
                 INVF_MODE* infVec,                  /*!< Vector where the inverse filtering levels will be stored. */
                 FIXP_DBL * noiseLevels,             /*!< Vector where the noise levels will be stored. */
                 INT* missingHarmonicFlag,           /*!< Flag set to one or zero, dependent on if any strong sines are missing.*/
                 UCHAR* missingHarmonicsIndex,       /*!< Vector indicating where sines are missing. */
                 UCHAR* envelopeCompensation,        /*!< Vector to store compensation values for the energies in. */
                 const SBR_FRAME_INFO *frameInfo,    /*!< Frame info struct, contains the time and frequency grid of the current frame.*/
                 UCHAR* transientInfo,               /*!< Transient info.*/
                 UCHAR * freqBandTable,              /*!< Frequency band tables for high-res.*/
                 INT nSfb,                           /*!< Number of scalefactor bands for high-res. */
                 XPOS_MODE xposType,                 /*!< Type of transposer used in the decoder.*/
                 UINT sbrSyntaxFlags
                 );

INT
FDKsbrEnc_CreateTonCorrParamExtr(HANDLE_SBR_TON_CORR_EST hTonCorr, /*!< Pointer to handle to SBR_TON_CORR struct. */
                                 INT                     chan);    /*!< Channel index, needed for mem allocation */

INT
FDKsbrEnc_InitTonCorrParamExtr(INT frameSize,                      /*!< Current SBR frame size. */
                               HANDLE_SBR_TON_CORR_EST hTonCorr,   /*!< Pointer to handle to SBR_TON_CORR struct. */
                               HANDLE_SBR_CONFIG_DATA sbrCfg,      /*!< Pointer to SBR configuration parameters. */
                               INT timeSlots,                      /*!< Number of time-slots per frame */
                               INT xposCtrl,                       /*!< Different patch modes. */
                               INT ana_max_level,                  /*!< Maximum level of the adaptive noise. */
                               INT noiseBands,                     /*!< Number of noise bands per octave. */
                               INT noiseFloorOffset,               /*!< Noise floor offset. */
                               UINT useSpeechConfig                /*!< Speech or music tuning. */
                              );

void
FDKsbrEnc_DeleteTonCorrParamExtr(HANDLE_SBR_TON_CORR_EST hTonCorr); /*!< Handle to SBR_TON_CORR struct. */

void
FDKsbrEnc_CalculateTonalityQuotas(HANDLE_SBR_TON_CORR_EST hTonCorr,
                        FIXP_DBL **sourceBufferReal,
                        FIXP_DBL **sourceBufferImag,
                        INT usb,
                        INT qmfScale                    /*!< sclefactor of QMF subsamples */
                       );

INT
FDKsbrEnc_ResetTonCorrParamExtr(HANDLE_SBR_TON_CORR_EST hTonCorr, /*!< Handle to SBR_TON_CORR struct. */
                      INT xposctrl,                     /*!< Different patch modes. */
                      INT highBandStartSb,              /*!< Start band of the SBR range. */
                      UCHAR *v_k_master,        /*!< Master frequency table from which all other table are derived.*/
                      INT numMaster,                    /*!< Number of elements in the master table. */
                      INT fs,                           /*!< Sampling frequency (of the SBR part). */
                      UCHAR** freqBandTable,    /*!< Frequency band table for low-res and high-res. */
                      INT* nSfb,                        /*!< Number of frequency bands (hig-res and low-res). */
                      INT noQmfChannels                 /*!< Number of QMF channels. */
                      );
#endif

C++程序 | 213行 | 12.41 KB

登录后可以享受更多权益