2012-07-11 10:15:24 -07:00
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/* -----------------------------------------------------------------------------------------------------------
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Software License for The Fraunhofer FDK AAC Codec Library for Android
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2013-08-08 17:26:40 -07:00
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<EFBFBD> Copyright 1995 - 2013 Fraunhofer-Gesellschaft zur F<EFBFBD>rderung der angewandten Forschung e.V.
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2012-07-11 10:15:24 -07:00
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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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/*****************************************************************************
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Description: FDKaacLdEnc_MdctTransform480:
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The module FDKaacLdEnc_MdctTransform will perform the MDCT.
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The MDCT supports the sine window and
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the zero padded window. The algorithm of the MDCT
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can be divided in Windowing, PreModulation, Fft and
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PostModulation.
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******************************************************************************/
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#include "transform.h"
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#include "dct.h"
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#include "psy_const.h"
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#include "aacEnc_rom.h"
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#include "FDK_tools_rom.h"
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INT FDKaacEnc_Transform_Real (const INT_PCM * pTimeData,
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FIXP_DBL *RESTRICT mdctData,
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const INT blockType,
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const INT windowShape,
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INT *prevWindowShape,
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const INT frameLength,
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INT *mdctData_e,
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INT filterType
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,FIXP_DBL * RESTRICT overlapAddBuffer
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)
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{
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const INT_PCM * RESTRICT timeData;
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INT i;
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/* tl: transform length
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fl: left window slope length
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nl: left window slope offset
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fr: right window slope length
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nr: right window slope offset
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See FDK_tools/doc/intern/mdct.tex for more detail. */
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int tl, fl, nl, fr, nr;
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const FIXP_WTP * RESTRICT pLeftWindowPart;
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const FIXP_WTP * RESTRICT pRightWindowPart;
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/*
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* MDCT scale:
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* + 1: fMultDiv2() in windowing.
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* + 1: Because of factor 1/2 in Princen-Bradley compliant windowed TDAC.
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*/
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*mdctData_e = 1+1;
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tl = frameLength;
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timeData = pTimeData;
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switch( blockType ) {
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case LONG_WINDOW:
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{
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int offset = (windowShape == LOL_WINDOW) ? ((frameLength * 3)>>2) : 0;
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fl = frameLength - offset;
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fr = frameLength - offset;
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}
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break;
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case STOP_WINDOW:
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fl = frameLength >> 3;
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fr = frameLength;
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break;
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case START_WINDOW: /* or StopStartSequence */
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fl = frameLength;
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fr = frameLength >> 3;
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break;
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case SHORT_WINDOW:
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fl = fr = frameLength >> 3;
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tl >>= 3;
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timeData = pTimeData + 3*fl + (fl/2);
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break;
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default:
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FDK_ASSERT(0);
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return -1;
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break;
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}
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/* Taken from FDK_tools/src/mdct.cpp Derive NR and NL */
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nr = (tl - fr)>>1;
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nl = (tl - fl)>>1;
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pLeftWindowPart = FDKgetWindowSlope(fl, *prevWindowShape);
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pRightWindowPart = FDKgetWindowSlope(fr, windowShape);
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/* windowing */
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if (filterType != FB_ELD)
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{
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/* Left window slope offset */
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for (i=0; i<nl ; i++)
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{
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#if SAMPLE_BITS == DFRACT_BITS /* SPC_BITS and DFRACT_BITS should be equal. */
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mdctData[(tl/2)+i] = - (FIXP_DBL) timeData[tl-i-1] >> ( 1 );
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#else
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mdctData[(tl/2)+i] = - (FIXP_DBL) timeData[tl-i-1] << (DFRACT_BITS - SAMPLE_BITS - 1);
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#endif
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}
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/* Left window slope */
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for (i=0; i<fl/2; i++)
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{
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FIXP_DBL tmp0;
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tmp0 = fMultDiv2((FIXP_PCM)timeData[i+nl], pLeftWindowPart[i].v.im);
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mdctData[(tl/2)+i+nl] = fMultSubDiv2(tmp0, (FIXP_PCM)timeData[tl-nl-i-1], pLeftWindowPart[i].v.re);
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}
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/* Right window slope offset */
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for(i=0; i<nr; i++)
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{
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#if SAMPLE_BITS == DFRACT_BITS /* This should be SPC_BITS instead of DFRACT_BITS. */
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mdctData[(tl/2)-1-i] = - (FIXP_DBL) timeData[tl+i] >> (1);
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#else
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mdctData[(tl/2)-1-i] = - (FIXP_DBL) timeData[tl+i] << (DFRACT_BITS - SAMPLE_BITS - 1);
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#endif
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}
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/* Right window slope */
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for (i=0; i<fr/2; i++)
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{
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FIXP_DBL tmp1;
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tmp1 = fMultDiv2((FIXP_PCM)timeData[tl+nr+i], pRightWindowPart[i].v.re);
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mdctData[(tl/2)-nr-i-1] = -fMultAddDiv2(tmp1, (FIXP_PCM)timeData[(tl*2)-nr-i-1], pRightWindowPart[i].v.im);
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}
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}
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if (filterType == FB_ELD)
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{
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const FIXP_WTB *pWindowELD=NULL;
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int i, N = frameLength, L = frameLength;
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if (frameLength == 512) {
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pWindowELD = ELDAnalysis512;
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} else {
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pWindowELD = ELDAnalysis480;
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}
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for(i=0;i<N/4;i++)
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{
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FIXP_DBL z0, outval;
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z0 = (fMult((FIXP_PCM)timeData[L+N*3/4-1-i], pWindowELD[N/2-1-i])<< (WTS0-1)) + (fMult((FIXP_PCM)timeData[L+N*3/4+i], pWindowELD[N/2+i])<< (WTS0-1));
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outval = (fMultDiv2((FIXP_PCM)timeData[L+N*3/4-1-i], pWindowELD[N+N/2-1-i]) >> (-WTS1));
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outval += (fMultDiv2((FIXP_PCM)timeData[L+N*3/4+i], pWindowELD[N+N/2+i]) >> (-WTS1) );
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outval += (fMultDiv2(overlapAddBuffer[N/2+i], pWindowELD[2*N+i])>> (-WTS2-1));
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overlapAddBuffer[N/2+i] = overlapAddBuffer[i];
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overlapAddBuffer[i] = z0;
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mdctData[i] = overlapAddBuffer[N/2+i] + (fMultDiv2(overlapAddBuffer[N+N/2-1-i], pWindowELD[2*N+N/2+i]) >> (-WTS2-1));
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mdctData[N-1-i] = outval;
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overlapAddBuffer[N+N/2-1-i] = outval;
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}
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for(i=N/4;i<N/2;i++)
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{
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FIXP_DBL z0, outval;
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z0 = fMult((FIXP_PCM)timeData[L+N*3/4-1-i], pWindowELD[N/2-1-i]) << (WTS0-1);
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outval = (fMultDiv2((FIXP_PCM)timeData[L+N*3/4-1-i], pWindowELD[N+N/2-1-i]) >> (-WTS1)) ;
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outval += (fMultDiv2(overlapAddBuffer[N/2+i], pWindowELD[2*N+i]) >> (-WTS2-1));
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overlapAddBuffer[N/2+i] = overlapAddBuffer[i] + (fMult((FIXP_PCM)timeData[L-N/4+i], pWindowELD[N/2+i])<< (WTS0-1) );
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overlapAddBuffer[i] = z0;
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mdctData[i] = overlapAddBuffer[N/2+i] + (fMultDiv2(overlapAddBuffer[N+N/2-1-i], pWindowELD[2*N+N/2+i]) >> (-WTS2-1));
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mdctData[N-1-i] = outval;
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overlapAddBuffer[N+N/2-1-i] = outval;
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}
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}
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dct_IV(mdctData, tl, mdctData_e);
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*prevWindowShape = windowShape;
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return 0;
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}
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