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diff --git a/libFDK/src/autocorr2nd.cpp b/libFDK/src/autocorr2nd.cpp new file mode 100644 index 0000000..e73ef14 --- /dev/null +++ b/libFDK/src/autocorr2nd.cpp @@ -0,0 +1,278 @@ + +/* ----------------------------------------------------------------------------------------------------------- +Software License for The Fraunhofer FDK AAC Codec Library for Android + +© Copyright 1995 - 2012 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. + All rights reserved. + + 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 +----------------------------------------------------------------------------------------------------------- */ + +/*************************** Fraunhofer IIS FDK Tools *********************** + + Author(s): M. Lohwasser + Description: auto-correlation functions + +******************************************************************************/ + +#include "autocorr2nd.h" + + + +/* If the accumulator does not provide enough overflow bits, + products have to be shifted down in the autocorrelation below. */ +#define SHIFT_FACTOR (5) +#define SHIFT >> (SHIFT_FACTOR) + + +#if defined(__CC_ARM) || defined(__arm__) +#include "arm/autocorr2nd.cpp" +#endif + + +/*! + * + * \brief Calculate second order autocorrelation using 2 accumulators + * + */ +#if !defined(FUNCTION_autoCorr2nd_real) +INT +autoCorr2nd_real (ACORR_COEFS *ac, /*!< Pointer to autocorrelation coeffs */ + const FIXP_DBL *reBuffer, /*!< Pointer to to real part of input samples */ + const int len /*!< Number input samples */ + ) +{ + int j, autoCorrScaling, mScale; + + FIXP_DBL accu1, accu2, accu3, accu4, accu5; + + const FIXP_DBL *pReBuf; + + const FIXP_DBL *realBuf = reBuffer; + + /* + r11r,r22r + r01r,r12r + r02r + */ + pReBuf = realBuf-2; + accu5 = ( (fMultDiv2(pReBuf[0], pReBuf[2]) + + fMultDiv2(pReBuf[1], pReBuf[3])) SHIFT); + pReBuf++; + + //len must be even + accu1 = fPow2Div2(pReBuf[0]) SHIFT; + accu3 = fMultDiv2(pReBuf[0], pReBuf[1]) SHIFT; + pReBuf++; + + for ( j = (len - 2)>>1; j != 0; j--,pReBuf+=2 ) { + + accu1 += ( (fPow2Div2(pReBuf[0]) + + fPow2Div2(pReBuf[1])) SHIFT); + + accu3 += ( (fMultDiv2(pReBuf[0], pReBuf[1]) + + fMultDiv2(pReBuf[1], pReBuf[2])) SHIFT); + + accu5 += ( (fMultDiv2(pReBuf[0], pReBuf[2]) + + fMultDiv2(pReBuf[1], pReBuf[3])) SHIFT); + + } + + accu2 = (fPow2Div2(realBuf[-2]) SHIFT); + accu2 += accu1; + + accu1 += (fPow2Div2(realBuf[len - 2]) SHIFT); + + accu4 = (fMultDiv2(realBuf[-1],realBuf[-2]) SHIFT); + accu4 += accu3; + + accu3 += (fMultDiv2(realBuf[len - 1],realBuf[len - 2]) SHIFT); + + mScale = CntLeadingZeros( (accu1 | accu2 | fAbs(accu3) | fAbs(accu4) | fAbs(accu5)) ) - 1; + autoCorrScaling = mScale - 1 - SHIFT_FACTOR; /* -1 because of fMultDiv2*/ + + /* Scale to common scale factor */ + ac->r11r = accu1 << mScale; + ac->r22r = accu2 << mScale; + ac->r01r = accu3 << mScale; + ac->r12r = accu4 << mScale; + ac->r02r = accu5 << mScale; + + ac->det = (fMultDiv2(ac->r11r,ac->r22r) - fMultDiv2(ac->r12r,ac->r12r)) ; + mScale = CountLeadingBits(fAbs(ac->det)); + + ac->det <<= mScale; + ac->det_scale = mScale - 1; + + return autoCorrScaling; +} +#endif + +#ifndef LOW_POWER_SBR_ONLY +#if !defined(FUNCTION_autoCorr2nd_cplx) +INT +autoCorr2nd_cplx (ACORR_COEFS *ac, /*!< Pointer to autocorrelation coeffs */ + const FIXP_DBL *reBuffer, /*!< Pointer to real part of input samples */ + const FIXP_DBL *imBuffer, /*!< Pointer to imag part of input samples */ + const int len /*!< Number of input samples */ + ) +{ + + int j, autoCorrScaling, mScale, len_scale; + + FIXP_DBL accu0, accu1,accu2, accu3, accu4, accu5, accu6, accu7, accu8; + + const FIXP_DBL *pReBuf, *pImBuf; + + const FIXP_DBL *realBuf = reBuffer; + const FIXP_DBL *imagBuf = imBuffer; + + (len>64) ? (len_scale = 6) : (len_scale = 5); + /* + r00r, + r11r,r22r + r01r,r12r + r01i,r12i + r02r,r02i + */ + accu1 = accu3 = accu5 = accu7 = accu8 = FL2FXCONST_DBL(0.0f); + + pReBuf = realBuf-2, pImBuf = imagBuf-2; + accu7 += ( (fMultDiv2(pReBuf[2], pReBuf[0]) + fMultDiv2(pImBuf[2], pImBuf[0])) >> len_scale); + accu8 += ( (fMultDiv2(pImBuf[2], pReBuf[0]) - fMultDiv2(pReBuf[2], pImBuf[0])) >> len_scale); + + pReBuf = realBuf-1, pImBuf = imagBuf-1; + for ( j = (len - 1); j != 0; j--,pReBuf++,pImBuf++ ){ + accu1 += ( (fPow2Div2(pReBuf[0] ) + fPow2Div2(pImBuf[0] )) >> len_scale); + accu3 += ( (fMultDiv2(pReBuf[0], pReBuf[1]) + fMultDiv2(pImBuf[0], pImBuf[1])) >> len_scale); + accu5 += ( (fMultDiv2(pImBuf[1], pReBuf[0]) - fMultDiv2(pReBuf[1], pImBuf[0])) >> len_scale); + accu7 += ( (fMultDiv2(pReBuf[2], pReBuf[0]) + fMultDiv2(pImBuf[2], pImBuf[0])) >> len_scale); + accu8 += ( (fMultDiv2(pImBuf[2], pReBuf[0]) - fMultDiv2(pReBuf[2], pImBuf[0])) >> len_scale); + } + + accu2 = ( (fPow2Div2(realBuf[-2]) + fPow2Div2(imagBuf[-2])) >> len_scale); + accu2 += accu1; + + accu1 += ( (fPow2Div2(realBuf[len-2]) + + fPow2Div2(imagBuf[len-2])) >> len_scale); + accu0 = ( (fPow2Div2(realBuf[len-1]) + + fPow2Div2(imagBuf[len-1])) >> len_scale) - + ( (fPow2Div2(realBuf[-1]) + + fPow2Div2(imagBuf[-1])) >> len_scale); + accu0 += accu1; + + accu4 = ( (fMultDiv2(realBuf[-1], realBuf[-2]) + + fMultDiv2(imagBuf[-1], imagBuf[-2])) >> len_scale); + accu4 += accu3; + + accu3 += ( (fMultDiv2(realBuf[len-1], realBuf[len-2]) + + fMultDiv2(imagBuf[len-1], imagBuf[len-2])) >> len_scale); + + accu6 = ( (fMultDiv2(imagBuf[-1], realBuf[-2]) - + fMultDiv2(realBuf[-1], imagBuf[-2])) >> len_scale); + accu6 += accu5; + + accu5 += ( (fMultDiv2(imagBuf[len - 1], realBuf[len - 2]) - + fMultDiv2(realBuf[len - 1], imagBuf[len - 2])) >> len_scale); + + mScale = CntLeadingZeros( (accu0 | accu1 | accu2 | fAbs(accu3) | fAbs(accu4) | fAbs(accu5) | + fAbs(accu6) | fAbs(accu7) | fAbs(accu8)) ) - 1; + autoCorrScaling = mScale - 1 - len_scale; /* -1 because of fMultDiv2*/ + + /* Scale to common scale factor */ + ac->r00r = (FIXP_DBL)accu0 << mScale; + ac->r11r = (FIXP_DBL)accu1 << mScale; + ac->r22r = (FIXP_DBL)accu2 << mScale; + ac->r01r = (FIXP_DBL)accu3 << mScale; + ac->r12r = (FIXP_DBL)accu4 << mScale; + ac->r01i = (FIXP_DBL)accu5 << mScale; + ac->r12i = (FIXP_DBL)accu6 << mScale; + ac->r02r = (FIXP_DBL)accu7 << mScale; + ac->r02i = (FIXP_DBL)accu8 << mScale; + + ac->det = ( fMultDiv2(ac->r11r,ac->r22r) >> 1 ) - + ( (fMultDiv2(ac->r12r,ac->r12r) + fMultDiv2(ac->r12i,ac->r12i)) >> 1 ); + mScale = CountLeadingBits(fAbs(ac->det)); + + ac->det <<= mScale; + ac->det_scale = mScale - 2; + + return autoCorrScaling; +} +#endif /* FUNCTION_autoCorr2nd_cplx */ +#endif /* LOW_POWER_SBR_ONLY */ + + |