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Diffstat (limited to 'libAACenc/src/noisedet.cpp')
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diff --git a/libAACenc/src/noisedet.cpp b/libAACenc/src/noisedet.cpp deleted file mode 100644 index f3c51de..0000000 --- a/libAACenc/src/noisedet.cpp +++ /dev/null @@ -1,228 +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 Audio Encoder ************************** - - Initial author: M. Lohwasser - contents/description: noisedet.c - Routines for Noise Detection - -******************************************************************************/ - -#include "noisedet.h" - -#include "aacenc_pns.h" -#include "pnsparam.h" - - -/***************************************************************************** - - functionname: FDKaacEnc_fuzzyIsSmaller - description: Fuzzy value calculation for "testVal is smaller than refVal" - returns: fuzzy value - input: test and ref Value, - low and high Lim - output: return fuzzy value - -*****************************************************************************/ -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 ); -} - - - -/***************************************************************************** - - functionname: FDKaacEnc_noiseDetect - description: detect tonal sfb's; two tests - Powerdistribution: - sfb splittet in four regions, - compare the energy in all sections - PsychTonality: - compare tonality from chaosmeasure with reftonality - returns: - input: spectrum of one large mdct - number of sfb's - pointer to offset of sfb's - pointer to noiseFuzzyMeasure (modified) - noiseparams struct - pointer to sfb energies - pointer to tonality calculated in chaosmeasure - output: noiseFuzzy Measure - -*****************************************************************************/ - -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; - 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++) { - - fuzzyTotal = (FIXP_SGL)MAXVAL_SGL; - sfbWidth = sfbOffset[sfb+1] - sfbOffset[sfb]; - - /* Reset output for lower bands or too small bands */ - 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)) ) { - 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) */ - - /* check power distribution in four regions */ - fhelp1 = fhelp2 = fhelp3 = fhelp4 = FL2FXCONST_DBL(0.0f); - 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); - } - - /* get max into fhelp: */ - maxVal = fixMax(fhelp1, fhelp2); - maxVal = fixMax(maxVal, fhelp3); - maxVal = fixMax(maxVal, fhelp4); - - /* get min into fhelp1: */ - minVal = fixMin(fhelp1, fhelp2); - minVal = fixMin(minVal, fhelp3); - minVal = fixMin(minVal, fhelp4); - - /* Normalize min and max Val */ - leadingBits = CountLeadingBits(maxVal); - testVal = maxVal << 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) */ - - fuzzyTotal = fixMin(fuzzyTotal, fuzzy); - } - - 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; - - 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; - } -} |