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authorThe Android Open Source Project <initial-contribution@android.com>2012-07-11 10:15:24 -0700
committerThe Android Open Source Project <initial-contribution@android.com>2012-07-11 10:15:24 -0700
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tree57f3d390ebb0782cc0de0fb984c8ea7e45b4f386 /libAACenc/src/band_nrg.cpp
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+
+/* -----------------------------------------------------------------------------------------------------------
+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
+----------------------------------------------------------------------------------------------------------- */
+
+/***************************** 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 = fixMax(0,sfbMaxScaleSpec[i]-4); /* max sfbWidth = 96 ; 2^7=128 => 7/2 = 4 (spc*spc) */
+ FIXP_DBL tmp = FL2FXCONST_DBL(0.0);
+ for (j=bandOffset[i];j<bandOffset[i+1];j++)
+ {
+ FIXP_DBL spec = mdctSpectrum[j]<<leadingBits;
+ tmp = fPow2AddDiv2(tmp, spec);
+ }
+ bandEnergy[i] = tmp<<1;
+ }
+
+ for(i=0; i<numBands; i++)
+ {
+ INT scale = 2*fixMax(0,sfbMaxScaleSpec[i]-4); /* max sfbWidth = 96 ; 2^7=128 => 7/2 = 4 (spc*spc) */
+ scale = fixMin(scale,(DFRACT_BITS-1));
+ 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;
+ }
+}