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252 lines
10 KiB
252 lines
10 KiB
/* -----------------------------------------------------------------------------
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Software License for The Fraunhofer FDK AAC Codec Library for Android
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© Copyright 1995 - 2019 Fraunhofer-Gesellschaft zur Förderung der angewandten
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Forschung e.V. All rights reserved.
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1. INTRODUCTION
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The Fraunhofer FDK AAC Codec Library for Android ("FDK AAC Codec") is software
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that implements the MPEG Advanced Audio Coding ("AAC") encoding and decoding
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scheme for digital audio. This FDK AAC Codec software is intended to be used on
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a wide variety of Android devices.
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AAC's HE-AAC and HE-AAC v2 versions are regarded as today's most efficient
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general perceptual audio codecs. AAC-ELD is considered the best-performing
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full-bandwidth communications codec by independent studies and is widely
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deployed. AAC has been standardized by ISO and IEC as part of the MPEG
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specifications.
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Patent licenses for necessary patent claims for the FDK AAC Codec (including
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those of Fraunhofer) may be obtained through Via Licensing
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(www.vialicensing.com) or through the respective patent owners individually for
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the purpose of encoding or decoding bit streams in products that are compliant
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with the ISO/IEC MPEG audio standards. Please note that most manufacturers of
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Android devices already license these patent claims through Via Licensing or
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directly from the patent owners, and therefore FDK AAC Codec software may
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already be covered under those patent licenses when it is used for those
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licensed purposes only.
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Commercially-licensed AAC software libraries, including floating-point versions
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with enhanced sound quality, are also available from Fraunhofer. Users are
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encouraged to check the Fraunhofer website for additional applications
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information and documentation.
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2. COPYRIGHT LICENSE
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Redistribution and use in source and binary forms, with or without modification,
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are permitted without payment of copyright license fees provided that you
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satisfy the following conditions:
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You must retain the complete text of this software license in redistributions of
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the FDK AAC Codec or your modifications thereto in source code form.
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You must retain the complete text of this software license in the documentation
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and/or other materials provided with redistributions of the FDK AAC Codec or
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your modifications thereto in binary form. You must make available free of
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charge copies of the complete source code of the FDK AAC Codec and your
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modifications thereto to recipients of copies in binary form.
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The name of Fraunhofer may not be used to endorse or promote products derived
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from this library without prior written permission.
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You may not charge copyright license fees for anyone to use, copy or distribute
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the FDK AAC Codec software or your modifications thereto.
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Your modified versions of the FDK AAC Codec must carry prominent notices stating
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that you changed the software and the date of any change. For modified versions
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of the FDK AAC Codec, the term "Fraunhofer FDK AAC Codec Library for Android"
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must be replaced by the term "Third-Party Modified Version of the Fraunhofer FDK
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AAC Codec Library for Android."
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3. NO PATENT LICENSE
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NO EXPRESS OR IMPLIED LICENSES TO ANY PATENT CLAIMS, including without
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limitation the patents of Fraunhofer, ARE GRANTED BY THIS SOFTWARE LICENSE.
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Fraunhofer provides no warranty of patent non-infringement with respect to this
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software.
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You may use this FDK AAC Codec software or modifications thereto only for
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purposes that are authorized by appropriate patent licenses.
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4. DISCLAIMER
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This FDK AAC Codec software is provided by Fraunhofer on behalf of the copyright
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holders and contributors "AS IS" and WITHOUT ANY EXPRESS OR IMPLIED WARRANTIES,
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including but not limited to the implied warranties of merchantability and
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fitness for a particular purpose. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
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CONTRIBUTORS BE LIABLE for any direct, indirect, incidental, special, exemplary,
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or consequential damages, including but not limited to procurement of substitute
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goods or services; loss of use, data, or profits, or business interruption,
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however caused and on any theory of liability, whether in contract, strict
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liability, or tort (including negligence), arising in any way out of the use of
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this software, even if advised of the possibility of such damage.
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5. CONTACT INFORMATION
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Fraunhofer Institute for Integrated Circuits IIS
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Attention: Audio and Multimedia Departments - FDK AAC LL
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Am Wolfsmantel 33
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91058 Erlangen, Germany
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www.iis.fraunhofer.de/amm
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amm-info@iis.fraunhofer.de
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----------------------------------------------------------------------------- */
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/******************* Library for basic calculation routines ********************
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Author(s): Manuel Jander, Josef Hoepfl, Youliy Ninov, Daniel Hagel
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Description: MDCT/MDST routines
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*******************************************************************************/
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#ifndef MDCT_H
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#define MDCT_H
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#include "common_fix.h"
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#define MDCT_OUT_HEADROOM 2 /* Output additional headroom */
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#define PCM_OUT_BITS DFRACT_BITS
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#define PCM_OUT_HEADROOM 8 /* Must have the same values as DMXH_HEADROOM */
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#define MDCT_OUTPUT_SCALE (-MDCT_OUT_HEADROOM + (DFRACT_BITS - PCM_OUT_BITS))
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/* Refer to "Output word length" in ISO/IEC 14496-3:2008(E) 23.2.3.6 */
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#define MDCT_OUTPUT_GAIN 16
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#define IMDCT_SCALE(x, s) \
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SATURATE_RIGHT_SHIFT((x), ((s) + MDCT_OUTPUT_SCALE), PCM_OUT_BITS)
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#define IMDCT_SCALE_DBL(x) (FIXP_DBL)(x)
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#define IMDCT_SCALE_DBL_LSH1(x) SATURATE_LEFT_SHIFT_ALT((x), 1, DFRACT_BITS)
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#define MLT_FLAG_CURR_ALIAS_SYMMETRY 1
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typedef enum {
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BLOCK_LONG = 0, /* normal long block */
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BLOCK_START, /* long start block */
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BLOCK_SHORT, /* 8 short blocks sequence */
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BLOCK_STOP /* long stop block*/
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} BLOCK_TYPE;
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typedef enum { SHAPE_SINE = 0, SHAPE_KBD, SHAPE_LOL } WINDOW_SHAPE;
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/**
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* \brief MDCT persistent data
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*/
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typedef struct {
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union {
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FIXP_DBL *freq;
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FIXP_DBL *time;
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} overlap; /**< Pointer to overlap memory */
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const FIXP_WTP *prev_wrs; /**< pointer to previous right window slope */
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int prev_tl; /**< previous transform length */
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int prev_nr; /**< previous right window offset */
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int prev_fr; /**< previous right window slope length */
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int ov_offset; /**< overlap time data fill level */
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int ov_size; /**< Overlap buffer size in words */
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int prevAliasSymmetry;
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int prevPrevAliasSymmetry;
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FIXP_DBL *pFacZir;
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FIXP_DBL *pAsymOvlp; /**< pointer to asymmetric overlap (used for stereo LPD
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transition) */
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} mdct_t;
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typedef mdct_t *H_MDCT;
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/**
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* \brief Initialize as valid MDCT handle
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*
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* \param hMdct handle of an allocated MDCT handle.
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* \param overlap pointer to FIXP_DBL overlap buffer.
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* \param overlapBufferSize size in FIXP_DBLs of the given overlap buffer.
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*/
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void mdct_init(H_MDCT hMdct, FIXP_DBL *overlap, INT overlapBufferSize);
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/**
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* \brief perform MDCT transform (time domain to frequency domain) with given
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* parameters.
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*
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* \param hMdct handle of an allocated MDCT handle.
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* \param pTimeData pointer to input time domain signal
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* \param noInSamples number of input samples
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* \param mdctData pointer to where the resulting MDCT spectrum will be stored
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* into.
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* \param nSpec number of spectra
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* \param pMdctData_e pointer to the input data exponent. Updated accordingly on
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* return for output data.
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* \return number of input samples processed.
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*/
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INT mdct_block(H_MDCT hMdct, const INT_PCM *pTimeData, const INT noInSamples,
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FIXP_DBL *RESTRICT mdctData, const INT nSpec, const INT tl,
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const FIXP_WTP *pRightWindowPart, const INT fr,
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SHORT *pMdctData_e);
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/**
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* \brief add/multiply 2/N transform gain and MPEG4 part 3 defined output gain
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* (see definition of MDCT_OUTPUT_GAIN) to given mantissa factor and exponent.
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* \param pGain pointer to the mantissa of a gain factor to be applied to IMDCT
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* data.
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* \param pExponent pointer to the exponent of a gain factor to be applied to
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* IMDCT data.
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* \param tl length of the IMDCT where the gain *pGain * (2 ^ *pExponent) will
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* be applied to.
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*/
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void imdct_gain(FIXP_DBL *pGain, int *pExponent, int tl);
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/**
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* \brief drain buffered output samples into given buffer. Changes the MDCT
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* state.
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*/
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INT imdct_drain(H_MDCT hMdct, FIXP_DBL *pTimeData, INT nrSamplesRoom);
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/**
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* \brief Copy overlap time domain data to given buffer. Does not change the
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* MDCT state.
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* \return number of actually copied samples (ov + nr).
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*/
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INT imdct_copy_ov_and_nr(H_MDCT hMdct, FIXP_DBL *pTimeData, INT nrSamples);
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/**
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* \brief Adapt MDCT parameters for non-matching window slopes.
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* \param hMdct handle of an allocated MDCT handle.
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* \param pfl pointer to left overlap window side length.
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* \param pnl pointer to length of the left n part of the window.
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* \param tl transform length.
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* \param wls pointer to the left side overlap window coefficients.
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* \param noOutSamples desired number of output samples.
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*/
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void imdct_adapt_parameters(H_MDCT hMdct, int *pfl, int *pnl, int tl,
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const FIXP_WTP *wls, int noOutSamples);
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/**
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* \brief perform several inverse MLT transforms (frequency domain to time
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* domain) with given parameters.
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*
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* \param hMdct handle of an allocated MDCT handle.
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* \param output pointer to where the output time domain signal will be stored
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* into.
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* \param spectrum pointer to the input MDCT spectra.
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* \param scalefactors exponents of the input spectrum.
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* \param nSpec number of MDCT spectrums.
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* \param noOutSamples desired number of output samples.
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* \param tl transform length.
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* \param wls pointer to the left side overlap window coefficients.
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* \param fl left overlap window side length.
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* \param wrs pointer to the right side overlap window coefficients of all
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* individual IMDCTs.
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* \param fr right overlap window side length of all individual IMDCTs.
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* \param gain factor to apply to output samples (if != 0).
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* \param flags flags controlling the type of transform
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* \return number of output samples returned.
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*/
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INT imlt_block(H_MDCT hMdct, FIXP_DBL *output, FIXP_DBL *spectrum,
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const SHORT scalefactor[], const INT nSpec,
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const INT noOutSamples, const INT tl, const FIXP_WTP *wls,
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INT fl, const FIXP_WTP *wrs, const INT fr, FIXP_DBL gain,
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int flags);
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#endif /* MDCT_H */
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