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Diffstat (limited to 'libAACenc/src/noisedet.cpp')
| -rw-r--r-- | libAACenc/src/noisedet.cpp | 211 |
1 files changed, 109 insertions, 102 deletions
diff --git a/libAACenc/src/noisedet.cpp b/libAACenc/src/noisedet.cpp index f3c51de..c984304 100644 --- a/libAACenc/src/noisedet.cpp +++ b/libAACenc/src/noisedet.cpp @@ -1,74 +1,85 @@ - -/* ----------------------------------------------------------------------------------------------------------- +/* ----------------------------------------------------------------------------- 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. +© Copyright 1995 - 2018 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. +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: +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 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 +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. +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. +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." +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. +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. +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. +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 @@ -79,22 +90,22 @@ Am Wolfsmantel 33 www.iis.fraunhofer.de/amm amm-info@iis.fraunhofer.de ------------------------------------------------------------------------------------------------------------ */ +----------------------------------------------------------------------------- */ + +/**************************** AAC encoder library ****************************** -/******************************** MPEG Audio Encoder ************************** + Author(s): M. Lohwasser - Initial author: M. Lohwasser - contents/description: noisedet.c - Routines for Noise Detection + Description: noisedet.c + Routines for Noise Detection -******************************************************************************/ +*******************************************************************************/ #include "noisedet.h" #include "aacenc_pns.h" #include "pnsparam.h" - /***************************************************************************** functionname: FDKaacEnc_fuzzyIsSmaller @@ -105,20 +116,16 @@ amm-info@iis.fraunhofer.de output: return fuzzy value *****************************************************************************/ -static FIXP_SGL FDKaacEnc_fuzzyIsSmaller( FIXP_DBL testVal, - FIXP_DBL refVal, - FIXP_DBL loLim, - FIXP_DBL hiLim ) -{ +static FIXP_SGL FDKaacEnc_fuzzyIsSmaller(FIXP_DBL testVal, FIXP_DBL refVal, + FIXP_DBL loLim, FIXP_DBL hiLim) { if (refVal <= FL2FXCONST_DBL(0.0)) - return( FL2FXCONST_SGL(0.0f) ); - else if (testVal >= fMult((hiLim>>1)+(loLim>>1), refVal)) - return( FL2FXCONST_SGL(0.0f) ); - else return( (FIXP_SGL)MAXVAL_SGL ); + return (FL2FXCONST_SGL(0.0f)); + else if (testVal >= fMult((hiLim >> 1) + (loLim >> 1), refVal)) + return (FL2FXCONST_SGL(0.0f)); + else + return ((FIXP_SGL)MAXVAL_SGL); } - - /***************************************************************************** functionname: FDKaacEnc_noiseDetect @@ -140,45 +147,45 @@ static FIXP_SGL FDKaacEnc_fuzzyIsSmaller( FIXP_DBL testVal, *****************************************************************************/ -void FDKaacEnc_noiseDetect(FIXP_DBL *RESTRICT mdctSpectrum, - INT *RESTRICT sfbMaxScaleSpec, - INT sfbActive, - const INT *RESTRICT sfbOffset, - FIXP_SGL *RESTRICT noiseFuzzyMeasure, - NOISEPARAMS *np, - FIXP_SGL *RESTRICT sfbtonality ) +void FDKaacEnc_noiseDetect(FIXP_DBL *RESTRICT mdctSpectrum, + INT *RESTRICT sfbMaxScaleSpec, INT sfbActive, + const INT *RESTRICT sfbOffset, + FIXP_SGL *RESTRICT noiseFuzzyMeasure, + NOISEPARAMS *np, FIXP_SGL *RESTRICT sfbtonality) { - int i, k, sfb, sfbWidth; + int i, k, sfb, sfbWidth; FIXP_SGL fuzzy, fuzzyTotal; FIXP_DBL refVal, testVal; /***** Start detection phase *****/ /* Start noise detection for each band based on a number of checks */ - for (sfb=0; sfb<sfbActive; sfb++) { - + for (sfb = 0; sfb < sfbActive; sfb++) { fuzzyTotal = (FIXP_SGL)MAXVAL_SGL; - sfbWidth = sfbOffset[sfb+1] - sfbOffset[sfb]; + sfbWidth = sfbOffset[sfb + 1] - sfbOffset[sfb]; /* Reset output for lower bands or too small bands */ - if (sfb < np->startSfb || sfbWidth < np->minSfbWidth) { + if (sfb < np->startSfb || sfbWidth < np->minSfbWidth) { noiseFuzzyMeasure[sfb] = FL2FXCONST_SGL(0.0f); continue; } - if ( (np->detectionAlgorithmFlags & USE_POWER_DISTRIBUTION) && (fuzzyTotal > FL2FXCONST_SGL(0.5f)) ) { + if ((np->detectionAlgorithmFlags & USE_POWER_DISTRIBUTION) && + (fuzzyTotal > FL2FXCONST_SGL(0.5f))) { FIXP_DBL fhelp1, fhelp2, fhelp3, fhelp4, maxVal, minVal; - INT leadingBits = fixMax(0,(sfbMaxScaleSpec[sfb] - 3)); /* max sfbWidth = 96/4 ; 2^5=32 => 5/2 = 3 (spc*spc) */ + INT leadingBits = fixMax( + 0, (sfbMaxScaleSpec[sfb] - + 3)); /* max sfbWidth = 96/4 ; 2^5=32 => 5/2 = 3 (spc*spc) */ /* check power distribution in four regions */ fhelp1 = fhelp2 = fhelp3 = fhelp4 = FL2FXCONST_DBL(0.0f); - k = sfbWidth >>2; /* Width of a quarter band */ + k = sfbWidth >> 2; /* Width of a quarter band */ - for (i=sfbOffset[sfb]; i<sfbOffset[sfb]+k; i++) { - fhelp1 = fPow2AddDiv2(fhelp1, mdctSpectrum[i]<<leadingBits); - fhelp2 = fPow2AddDiv2(fhelp2, mdctSpectrum[i+k]<<leadingBits); - fhelp3 = fPow2AddDiv2(fhelp3, mdctSpectrum[i+2*k]<<leadingBits); - fhelp4 = fPow2AddDiv2(fhelp4, mdctSpectrum[i+3*k]<<leadingBits); + for (i = sfbOffset[sfb]; i < sfbOffset[sfb] + k; i++) { + fhelp1 = fPow2AddDiv2(fhelp1, mdctSpectrum[i] << leadingBits); + fhelp2 = fPow2AddDiv2(fhelp2, mdctSpectrum[i + k] << leadingBits); + fhelp3 = fPow2AddDiv2(fhelp3, mdctSpectrum[i + 2 * k] << leadingBits); + fhelp4 = fPow2AddDiv2(fhelp4, mdctSpectrum[i + 3 * k] << leadingBits); } /* get max into fhelp: */ @@ -194,34 +201,34 @@ void FDKaacEnc_noiseDetect(FIXP_DBL *RESTRICT mdctSpectrum, /* Normalize min and max Val */ leadingBits = CountLeadingBits(maxVal); testVal = maxVal << leadingBits; - refVal = minVal << leadingBits; + refVal = minVal << leadingBits; /* calculate fuzzy value for power distribution */ testVal = fMultDiv2(testVal, np->powDistPSDcurve[sfb]); - fuzzy = FDKaacEnc_fuzzyIsSmaller(testVal, /* 1/2 * maxValue * PSDcurve */ - refVal, /* 1 * minValue */ - FL2FXCONST_DBL(0.495), /* 1/2 * loLim (0.99f/2) */ - FL2FXCONST_DBL(0.505)); /* 1/2 * hiLim (1.01f/2) */ + fuzzy = FDKaacEnc_fuzzyIsSmaller( + testVal, /* 1/2 * maxValue * PSDcurve */ + refVal, /* 1 * minValue */ + FL2FXCONST_DBL(0.495), /* 1/2 * loLim (0.99f/2) */ + FL2FXCONST_DBL(0.505)); /* 1/2 * hiLim (1.01f/2) */ fuzzyTotal = fixMin(fuzzyTotal, fuzzy); } - if ( (np->detectionAlgorithmFlags & USE_PSYCH_TONALITY) && (fuzzyTotal > FL2FXCONST_SGL(0.5f)) ) { + if ((np->detectionAlgorithmFlags & USE_PSYCH_TONALITY) && + (fuzzyTotal > FL2FXCONST_SGL(0.5f))) { /* Detection with tonality-value of psych. acoustic (here: 1 is tonal!)*/ - testVal = FX_SGL2FX_DBL(sfbtonality[sfb])>>1; /* 1/2 * sfbTonality */ - refVal = np->refTonality; + testVal = FX_SGL2FX_DBL(sfbtonality[sfb]) >> 1; /* 1/2 * sfbTonality */ + refVal = np->refTonality; - fuzzy = FDKaacEnc_fuzzyIsSmaller(testVal, - refVal, - FL2FXCONST_DBL(0.45f), /* 1/2 * loLim (0.9f/2) */ - FL2FXCONST_DBL(0.55f)); /* 1/2 * hiLim (1.1f/2) */ + fuzzy = FDKaacEnc_fuzzyIsSmaller( + testVal, refVal, FL2FXCONST_DBL(0.45f), /* 1/2 * loLim (0.9f/2) */ + FL2FXCONST_DBL(0.55f)); /* 1/2 * hiLim (1.1f/2) */ fuzzyTotal = fixMin(fuzzyTotal, fuzzy); } - /* Output of final result */ noiseFuzzyMeasure[sfb] = fuzzyTotal; } |