| /* ----------------------------------------------------------------------------- |
| 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; |
| } |
| } |