mirror of https://github.com/mstorsjo/fdk-aac.git
205 lines
9.2 KiB
C++
205 lines
9.2 KiB
C++
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/* -----------------------------------------------------------------------------------------------------------
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Software License for The Fraunhofer FDK AAC Codec Library for Android
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© Copyright 1995 - 2013 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V.
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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 that implements
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the MPEG Advanced Audio Coding ("AAC") encoding and decoding scheme for digital audio.
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This FDK AAC Codec software is intended to be used on 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 general perceptual
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audio codecs. AAC-ELD is considered the best-performing full-bandwidth communications codec by
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independent studies and is widely deployed. AAC has been standardized by ISO and IEC as part
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of the MPEG specifications.
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Patent licenses for necessary patent claims for the FDK AAC Codec (including those of Fraunhofer)
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may be obtained through Via Licensing (www.vialicensing.com) or through the respective patent owners
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individually for the purpose of encoding or decoding bit streams in products that are compliant with
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the ISO/IEC MPEG audio standards. Please note that most manufacturers of Android devices already license
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these patent claims through Via Licensing or directly from the patent owners, and therefore FDK AAC Codec
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software may already be covered under those patent licenses when it is used for those licensed purposes only.
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Commercially-licensed AAC software libraries, including floating-point versions with enhanced sound quality,
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are also available from Fraunhofer. Users are encouraged to check the Fraunhofer website for additional
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applications 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, are permitted without
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payment of copyright license fees provided that you satisfy the following conditions:
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You must retain the complete text of this software license in redistributions of the FDK AAC Codec or
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your modifications thereto in source code form.
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You must retain the complete text of this software license in the documentation and/or other materials
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provided with redistributions of the FDK AAC Codec or your modifications thereto in binary form.
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You must make available free of 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 from this library without
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prior written permission.
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You may not charge copyright license fees for anyone to use, copy or distribute the FDK AAC Codec
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software or your modifications thereto.
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Your modified versions of the FDK AAC Codec must carry prominent notices stating that you changed the software
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and the date of any change. For modified versions of the FDK AAC Codec, the term
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"Fraunhofer FDK AAC Codec Library for Android" must be replaced by the term
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"Third-Party Modified Version of the Fraunhofer FDK 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 limitation the patents of Fraunhofer,
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ARE GRANTED BY THIS SOFTWARE LICENSE. Fraunhofer provides no warranty of patent non-infringement with
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respect to this software.
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You may use this FDK AAC Codec software or modifications thereto only for purposes that are authorized
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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 holders and contributors
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"AS IS" and WITHOUT ANY EXPRESS OR IMPLIED WARRANTIES, including but not limited to the implied warranties
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of merchantability and 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, or consequential damages,
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including but not limited to procurement of substitute goods or services; loss of use, data, or profits,
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or business interruption, 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 this software, even if
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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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/******************************** MPEG Audio Encoder **************************
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author: M. Werner
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contents/description: Convert chaos measure to the tonality index
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******************************************************************************/
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#include "tonality.h"
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#include "chaosmeasure.h"
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static const FIXP_DBL normlog = (FIXP_DBL)0xd977d949; /*FL2FXCONST_DBL(-0.4342944819f * FDKlog(2.0)/FDKlog(2.7182818)); */
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static void FDKaacEnc_CalcSfbTonality(FIXP_DBL *RESTRICT spectrum,
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INT *RESTRICT sfbMaxScaleSpec,
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FIXP_DBL *RESTRICT chaosMeasure,
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FIXP_SGL *RESTRICT sfbTonality,
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INT sfbCnt,
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const INT *RESTRICT sfbOffset,
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FIXP_DBL *RESTRICT sfbEnergyLD64 );
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void FDKaacEnc_CalculateFullTonality(FIXP_DBL *RESTRICT spectrum,
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INT *RESTRICT sfbMaxScaleSpec,
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FIXP_DBL *RESTRICT sfbEnergyLD64,
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FIXP_SGL *RESTRICT sfbTonality,
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INT sfbCnt,
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const INT *sfbOffset,
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INT usePns)
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{
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INT j;
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#if defined(ARCH_PREFER_MULT_32x16)
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FIXP_SGL alpha_0 = FL2FXCONST_SGL(0.25f); /* used in smooth ChaosMeasure */
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FIXP_SGL alpha_1 = FL2FXCONST_SGL(1.0f-0.25f); /* used in smooth ChaosMeasure */
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#else
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FIXP_DBL alpha_0 = FL2FXCONST_DBL(0.25f); /* used in smooth ChaosMeasure */
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FIXP_DBL alpha_1 = FL2FXCONST_DBL(1.0f-0.25f); /* used in smooth ChaosMeasure */
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#endif
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INT numberOfLines = sfbOffset[sfbCnt];
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if (!usePns)
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return;
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C_ALLOC_SCRATCH_START(chaosMeasurePerLine, FIXP_DBL, (1024));
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/* calculate chaos measure */
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FDKaacEnc_CalculateChaosMeasure(spectrum,
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numberOfLines,
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chaosMeasurePerLine);
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/* smooth ChaosMeasure */
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for (j=1;j<numberOfLines;j++) {
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FIXP_DBL tmp = fMultDiv2(alpha_1, chaosMeasurePerLine[j]);
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chaosMeasurePerLine[j] = fMultAdd(tmp, alpha_0, chaosMeasurePerLine[j-1]);
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}
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FDKaacEnc_CalcSfbTonality(spectrum,
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sfbMaxScaleSpec,
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chaosMeasurePerLine,
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sfbTonality,
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sfbCnt,
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sfbOffset,
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sfbEnergyLD64);
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C_ALLOC_SCRATCH_END(chaosMeasurePerLine, FIXP_DBL, (1024));
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}
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/*****************************************************************************
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functionname: CalculateTonalityIndex
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description: computes tonality values out of unpredictability values
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limits range and computes log()
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returns:
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input: ptr to energies, ptr to chaos measure values,
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number of sfb
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output: sfb wise tonality values
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*****************************************************************************/
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static void FDKaacEnc_CalcSfbTonality(FIXP_DBL *RESTRICT spectrum,
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INT *RESTRICT sfbMaxScaleSpec,
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FIXP_DBL *RESTRICT chaosMeasure,
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FIXP_SGL *RESTRICT sfbTonality,
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INT sfbCnt,
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const INT *RESTRICT sfbOffset,
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FIXP_DBL *RESTRICT sfbEnergyLD64 )
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{
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INT i, j;
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for (i=0; i<sfbCnt; i++) {
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FIXP_DBL chaosMeasureSfbLD64;
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INT shiftBits = fixMax(0,sfbMaxScaleSpec[i] - 4); /* max sfbWidth = 96 ; 2^7=128 => 7/2 = 4 (spc*spc) */
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FIXP_DBL chaosMeasureSfb = FL2FXCONST_DBL(0.0);
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/* calc chaosMeasurePerSfb */
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for (j=(sfbOffset[i+1]-sfbOffset[i])-1; j>=0; j--) {
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FIXP_DBL tmp = (*spectrum++)<<shiftBits;
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FIXP_DBL lineNrg = fMultDiv2(tmp, tmp);
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chaosMeasureSfb = fMultAddDiv2(chaosMeasureSfb, lineNrg, *chaosMeasure++);
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}
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/* calc tonalityPerSfb */
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if (chaosMeasureSfb != FL2FXCONST_DBL(0.0))
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{
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/* add ld(convtone)/64 and 2/64 bec.fMultDiv2 */
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chaosMeasureSfbLD64 = CalcLdData((chaosMeasureSfb)) - sfbEnergyLD64[i];
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chaosMeasureSfbLD64 += FL2FXCONST_DBL(3.0f/64) - ((FIXP_DBL)(shiftBits)<<(DFRACT_BITS-6));
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if (chaosMeasureSfbLD64 > FL2FXCONST_DBL(-0.0519051) ) /* > ld(0.05)+ld(2) */
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{
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if (chaosMeasureSfbLD64 <= FL2FXCONST_DBL(0.0) )
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sfbTonality[i] = FX_DBL2FX_SGL(fMultDiv2( chaosMeasureSfbLD64 , normlog ) << 7);
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else
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sfbTonality[i] = FL2FXCONST_SGL(0.0);
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}
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else
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sfbTonality[i] = (FIXP_SGL)MAXVAL_SGL;
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}
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else
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sfbTonality[i] = (FIXP_SGL)MAXVAL_SGL;
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}
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}
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