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Diffstat (limited to 'libAACenc/src/band_nrg.cpp')
| -rw-r--r-- | libAACenc/src/band_nrg.cpp | 359 |
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diff --git a/libAACenc/src/band_nrg.cpp b/libAACenc/src/band_nrg.cpp deleted file mode 100644 index 861f7a8..0000000 --- a/libAACenc/src/band_nrg.cpp +++ /dev/null @@ -1,359 +0,0 @@ - -/* ----------------------------------------------------------------------------------------------------------- -Software License for The Fraunhofer FDK AAC Codec Library for Android - -© Copyright 1995 - 2013 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 ------------------------------------------------------------------------------------------------------------ */ - -/***************************** MPEG-4 AAC Encoder ************************** - - Initial author: M. Werner - contents/description: Band/Line energy calculations - -******************************************************************************/ - -#include "band_nrg.h" - - -/***************************************************************************** - functionname: FDKaacEnc_CalcSfbMaxScaleSpec - description: - input: - output: -*****************************************************************************/ -void -FDKaacEnc_CalcSfbMaxScaleSpec(const FIXP_DBL *RESTRICT mdctSpectrum, - const INT *RESTRICT bandOffset, - INT *RESTRICT sfbMaxScaleSpec, - const INT numBands) -{ - INT i,j; - FIXP_DBL maxSpc, tmp; - - for(i=0; i<numBands; i++) { - maxSpc = (FIXP_DBL)0; - for (j=bandOffset[i]; j<bandOffset[i+1]; j++) { - tmp = fixp_abs(mdctSpectrum[j]); - maxSpc = fixMax(maxSpc, tmp); - } - sfbMaxScaleSpec[i] = (maxSpc==(FIXP_DBL)0) ? (DFRACT_BITS-2) : CntLeadingZeros(maxSpc)-1; - /* CountLeadingBits() is not necessary here since test value is always > 0 */ - } -} - -/***************************************************************************** - functionname: FDKaacEnc_CheckBandEnergyOptim - description: - input: - output: -*****************************************************************************/ -FIXP_DBL -FDKaacEnc_CheckBandEnergyOptim(const FIXP_DBL *RESTRICT mdctSpectrum, - INT *RESTRICT sfbMaxScaleSpec, - const INT *RESTRICT bandOffset, - const INT numBands, - FIXP_DBL *RESTRICT bandEnergy, - FIXP_DBL *RESTRICT bandEnergyLdData, - INT minSpecShift) -{ - INT i, j, scale, nr = 0; - FIXP_DBL maxNrgLd = FL2FXCONST_DBL(-1.0f); - FIXP_DBL maxNrg = 0; - FIXP_DBL spec; - - for(i=0; i<numBands; i++) { - scale = fixMax(0, sfbMaxScaleSpec[i]-4); - FIXP_DBL tmp = 0; - for (j=bandOffset[i]; j<bandOffset[i+1]; j++){ - spec = mdctSpectrum[j]<<scale; - tmp = fPow2AddDiv2(tmp, spec); - } - bandEnergy[i] = tmp<<1; - - /* calculate ld of bandNrg, subtract scaling */ - bandEnergyLdData[i] = CalcLdData(bandEnergy[i]); - if (bandEnergyLdData[i] != FL2FXCONST_DBL(-1.0f)) { - bandEnergyLdData[i] -= scale*FL2FXCONST_DBL(2.0/64); - } - /* find index of maxNrg */ - if (bandEnergyLdData[i] > maxNrgLd) { - maxNrgLd = bandEnergyLdData[i]; - nr = i; - } - } - - /* return unscaled maxNrg*/ - scale = fixMax(0,sfbMaxScaleSpec[nr]-4); - scale = fixMax(2*(minSpecShift-scale),-(DFRACT_BITS-1)); - - maxNrg = scaleValue(bandEnergy[nr], scale); - - return maxNrg; -} - -/***************************************************************************** - functionname: FDKaacEnc_CalcBandEnergyOptimLong - description: - input: - output: -*****************************************************************************/ -INT -FDKaacEnc_CalcBandEnergyOptimLong(const FIXP_DBL *RESTRICT mdctSpectrum, - INT *RESTRICT sfbMaxScaleSpec, - const INT *RESTRICT bandOffset, - const INT numBands, - FIXP_DBL *RESTRICT bandEnergy, - FIXP_DBL *RESTRICT bandEnergyLdData) -{ - INT i, j, shiftBits = 0; - FIXP_DBL maxNrgLd = FL2FXCONST_DBL(0.0f); - - FIXP_DBL spec; - - for(i=0; i<numBands; i++) { - INT leadingBits = sfbMaxScaleSpec[i]-4; /* max sfbWidth = 96 ; 2^7=128 => 7/2 = 4 (spc*spc) */ - FIXP_DBL tmp = FL2FXCONST_DBL(0.0); - /* don't use scaleValue() here, it increases workload quite sufficiently... */ - if (leadingBits>=0) { - for (j=bandOffset[i];j<bandOffset[i+1];j++) { - spec = mdctSpectrum[j]<<leadingBits; - tmp = fPow2AddDiv2(tmp, spec); - } - } else { - INT shift = -leadingBits; - for (j=bandOffset[i];j<bandOffset[i+1];j++){ - spec = mdctSpectrum[j]>>shift; - tmp = fPow2AddDiv2(tmp, spec); - } - } - bandEnergy[i] = tmp<<1; - } - - /* calculate ld of bandNrg, subtract scaling */ - LdDataVector(bandEnergy, bandEnergyLdData, numBands); - for(i=numBands; i--!=0; ) { - FIXP_DBL scaleDiff = (sfbMaxScaleSpec[i]-4)*FL2FXCONST_DBL(2.0/64); - - bandEnergyLdData[i] = (bandEnergyLdData[i] >= ((FL2FXCONST_DBL(-1.f)>>1) + (scaleDiff>>1))) - ? bandEnergyLdData[i]-scaleDiff : FL2FXCONST_DBL(-1.f); - /* find maxNrgLd */ - maxNrgLd = fixMax(maxNrgLd, bandEnergyLdData[i]); - } - - if (maxNrgLd<=(FIXP_DBL)0) - { - for(i=numBands; i--!=0; ) - { - INT scale = fixMin((sfbMaxScaleSpec[i]-4)<<1,(DFRACT_BITS-1)); - bandEnergy[i] = scaleValue(bandEnergy[i], -scale); - } - return 0; - } - else - { /* scale down NRGs */ - while (maxNrgLd>FL2FXCONST_DBL(0.0f)) - { - maxNrgLd -= FL2FXCONST_DBL(2.0/64); - shiftBits++; - } - for(i=numBands; i--!=0; ) - { - INT scale = fixMin( ((sfbMaxScaleSpec[i]-4)+shiftBits)<<1, (DFRACT_BITS-1)); - bandEnergyLdData[i] -= shiftBits*FL2FXCONST_DBL(2.0/64); - bandEnergy[i] = scaleValue(bandEnergy[i], -scale); - } - return shiftBits; - } -} - - -/***************************************************************************** - functionname: FDKaacEnc_CalcBandEnergyOptimShort - description: - input: - output: -*****************************************************************************/ -void -FDKaacEnc_CalcBandEnergyOptimShort(const FIXP_DBL *RESTRICT mdctSpectrum, - INT *RESTRICT sfbMaxScaleSpec, - const INT *RESTRICT bandOffset, - const INT numBands, - FIXP_DBL *RESTRICT bandEnergy) -{ - INT i, j; - - for(i=0; i<numBands; i++) - { - int leadingBits = sfbMaxScaleSpec[i]-3; /* max sfbWidth = 36 ; 2^6=64 => 6/2 = 3 (spc*spc) */ - FIXP_DBL tmp = FL2FXCONST_DBL(0.0); - for (j=bandOffset[i];j<bandOffset[i+1];j++) - { - FIXP_DBL spec = scaleValue(mdctSpectrum[j],leadingBits); - tmp = fPow2AddDiv2(tmp, spec); - } - bandEnergy[i] = tmp; - } - - for(i=0; i<numBands; i++) - { - INT scale = (2*(sfbMaxScaleSpec[i]-3))-1; /* max sfbWidth = 36 ; 2^6=64 => 6/2 = 3 (spc*spc) */ - scale = fixMax(fixMin(scale,(DFRACT_BITS-1)),-(DFRACT_BITS-1)); - bandEnergy[i] = scaleValueSaturate(bandEnergy[i], -scale); - } -} - - -/***************************************************************************** - functionname: FDKaacEnc_CalcBandNrgMSOpt - description: - input: - output: -*****************************************************************************/ -void FDKaacEnc_CalcBandNrgMSOpt(const FIXP_DBL *RESTRICT mdctSpectrumLeft, - const FIXP_DBL *RESTRICT mdctSpectrumRight, - INT *RESTRICT sfbMaxScaleSpecLeft, - INT *RESTRICT sfbMaxScaleSpecRight, - const INT *RESTRICT bandOffset, - const INT numBands, - FIXP_DBL *RESTRICT bandEnergyMid, - FIXP_DBL *RESTRICT bandEnergySide, - INT calcLdData, - FIXP_DBL *RESTRICT bandEnergyMidLdData, - FIXP_DBL *RESTRICT bandEnergySideLdData) -{ - INT i, j, minScale; - FIXP_DBL NrgMid, NrgSide, specm, specs; - - for (i=0; i<numBands; i++) { - - NrgMid = NrgSide = FL2FXCONST_DBL(0.0); - minScale = fixMin(sfbMaxScaleSpecLeft[i], sfbMaxScaleSpecRight[i])-4; - minScale = fixMax(0, minScale); - - if (minScale > 0) { - for (j=bandOffset[i];j<bandOffset[i+1];j++) { - FIXP_DBL specL = mdctSpectrumLeft[j]<<(minScale-1); - FIXP_DBL specR = mdctSpectrumRight[j]<<(minScale-1); - specm = specL + specR; - specs = specL - specR; - NrgMid = fPow2AddDiv2(NrgMid, specm); - NrgSide = fPow2AddDiv2(NrgSide, specs); - } - } else { - for (j=bandOffset[i];j<bandOffset[i+1];j++) { - FIXP_DBL specL = mdctSpectrumLeft[j]>>1; - FIXP_DBL specR = mdctSpectrumRight[j]>>1; - specm = specL + specR; - specs = specL - specR; - NrgMid = fPow2AddDiv2(NrgMid, specm); - NrgSide = fPow2AddDiv2(NrgSide, specs); - } - } - bandEnergyMid[i] = NrgMid<<1; - bandEnergySide[i] = NrgSide<<1; - } - - if(calcLdData) { - LdDataVector(bandEnergyMid, bandEnergyMidLdData, numBands); - LdDataVector(bandEnergySide, bandEnergySideLdData, numBands); - } - - for (i=0; i<numBands; i++) - { - INT minScale = fixMin(sfbMaxScaleSpecLeft[i], sfbMaxScaleSpecRight[i]); - INT scale = fixMax(0, 2*(minScale-4)); - - if (calcLdData) - { - /* using the minimal scaling of left and right channel can cause very small energies; - check ldNrg before subtract scaling multiplication: fract*INT we don't need fMult */ - - int minus = scale*FL2FXCONST_DBL(1.0/64); - - if (bandEnergyMidLdData[i] != FL2FXCONST_DBL(-1.0f)) - bandEnergyMidLdData[i] -= minus; - - if (bandEnergySideLdData[i] != FL2FXCONST_DBL(-1.0f)) - bandEnergySideLdData[i] -= minus; - } - scale = fixMin(scale, (DFRACT_BITS-1)); - bandEnergyMid[i] >>= scale; - bandEnergySide[i] >>= scale; - } -} |