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Diffstat (limited to 'fdk-aac/libAACenc/src/tonality.cpp')
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diff --git a/fdk-aac/libAACenc/src/tonality.cpp b/fdk-aac/libAACenc/src/tonality.cpp new file mode 100644 index 0000000..334e0f1 --- /dev/null +++ b/fdk-aac/libAACenc/src/tonality.cpp @@ -0,0 +1,219 @@ +/* ----------------------------------------------------------------------------- +Software License for The Fraunhofer FDK AAC Codec Library for Android + +© 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. + +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 +----------------------------------------------------------------------------- */ + +/**************************** AAC encoder library ****************************** + + Author(s): M. Werner + + Description: Convert chaos measure to the tonality index + +*******************************************************************************/ + +#include "tonality.h" + +#include "chaosmeasure.h" + +#if defined(__arm__) +#endif + +static const FIXP_DBL normlog = + (FIXP_DBL)0xd977d949; /*FL2FXCONST_DBL(-0.4342944819f * + FDKlog(2.0)/FDKlog(2.7182818)); */ + +static void FDKaacEnc_CalcSfbTonality(FIXP_DBL *RESTRICT spectrum, + INT *RESTRICT sfbMaxScaleSpec, + FIXP_DBL *RESTRICT chaosMeasure, + FIXP_SGL *RESTRICT sfbTonality, + INT sfbCnt, const INT *RESTRICT sfbOffset, + FIXP_DBL *RESTRICT sfbEnergyLD64); + +void FDKaacEnc_CalculateFullTonality(FIXP_DBL *RESTRICT spectrum, + INT *RESTRICT sfbMaxScaleSpec, + FIXP_DBL *RESTRICT sfbEnergyLD64, + FIXP_SGL *RESTRICT sfbTonality, INT sfbCnt, + const INT *sfbOffset, INT usePns) { + INT j; + INT numberOfLines = sfbOffset[sfbCnt]; + + if (usePns) { + C_ALLOC_SCRATCH_START(chaosMeasurePerLine, FIXP_DBL, (1024)) + + /* calculate chaos measure */ + FDKaacEnc_CalculateChaosMeasure(spectrum, numberOfLines, + chaosMeasurePerLine); + + /* smooth ChaosMeasure */ + FIXP_DBL left = chaosMeasurePerLine[0]; + FIXP_DBL right; + for (j = 1; j < (numberOfLines - 1); j += 2) { + right = chaosMeasurePerLine[j]; + right = right - (right >> 2); + left = right + (left >> 2); + chaosMeasurePerLine[j] = left; /* 0.25 left + 0.75 right */ + + right = chaosMeasurePerLine[j + 1]; + right = right - (right >> 2); + left = right + (left >> 2); + chaosMeasurePerLine[j + 1] = left; + } + if (j == (numberOfLines - 1)) { + right = chaosMeasurePerLine[j]; + right = right - (right >> 2); + left = right + (left >> 2); + chaosMeasurePerLine[j] = left; + } + + FDKaacEnc_CalcSfbTonality(spectrum, sfbMaxScaleSpec, chaosMeasurePerLine, + sfbTonality, sfbCnt, sfbOffset, sfbEnergyLD64); + + C_ALLOC_SCRATCH_END(chaosMeasurePerLine, FIXP_DBL, (1024)) + } +} + +/***************************************************************************** + + functionname: CalculateTonalityIndex + description: computes tonality values out of unpredictability values + limits range and computes log() + returns: + input: ptr to energies, ptr to chaos measure values, + number of sfb + output: sfb wise tonality values + +*****************************************************************************/ +static void FDKaacEnc_CalcSfbTonality(FIXP_DBL *RESTRICT spectrum, + INT *RESTRICT sfbMaxScaleSpec, + FIXP_DBL *RESTRICT chaosMeasure, + FIXP_SGL *RESTRICT sfbTonality, + INT sfbCnt, const INT *RESTRICT sfbOffset, + FIXP_DBL *RESTRICT sfbEnergyLD64) { + INT i; + + for (i = 0; i < sfbCnt; i++) { + FIXP_DBL chaosMeasureSfbLD64; + INT shiftBits = + fixMax(0, sfbMaxScaleSpec[i] - + 4); /* max sfbWidth = 96 ; 2^7=128 => 7/2 = 4 (spc*spc) */ + + INT j; + FIXP_DBL chaosMeasureSfb = FL2FXCONST_DBL(0.0); + + /* calc chaosMeasurePerSfb */ + for (j = (sfbOffset[i + 1] - sfbOffset[i]) - 1; j >= 0; j--) { + FIXP_DBL tmp = (*spectrum++) << shiftBits; + FIXP_DBL lineNrg = fMultDiv2(tmp, tmp); + chaosMeasureSfb = fMultAddDiv2(chaosMeasureSfb, lineNrg, *chaosMeasure++); + } + + /* calc tonalityPerSfb */ + if (chaosMeasureSfb != FL2FXCONST_DBL(0.0)) { + /* add ld(convtone)/64 and 2/64 bec.fMultDiv2 */ + chaosMeasureSfbLD64 = CalcLdData((chaosMeasureSfb)) - sfbEnergyLD64[i]; + chaosMeasureSfbLD64 += FL2FXCONST_DBL(3.0f / 64) - + ((FIXP_DBL)(shiftBits) << (DFRACT_BITS - 6)); + + if (chaosMeasureSfbLD64 > + FL2FXCONST_DBL(-0.0519051)) /* > ld(0.05)+ld(2) */ + { + if (chaosMeasureSfbLD64 <= FL2FXCONST_DBL(0.0)) + sfbTonality[i] = + FX_DBL2FX_SGL(fMultDiv2(chaosMeasureSfbLD64, normlog) << 7); + else + sfbTonality[i] = FL2FXCONST_SGL(0.0); + } else + sfbTonality[i] = (FIXP_SGL)MAXVAL_SGL; + } else + sfbTonality[i] = (FIXP_SGL)MAXVAL_SGL; + } +} |