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-
-/* -----------------------------------------------------------------------------------------------------------
-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 **************************
-
- author: M. Werner
- contents/description: Convert chaos measure to the tonality index
-
-******************************************************************************/
-
-#include "tonality.h"
-#include "chaosmeasure.h"
-
-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;
-#if defined(ARCH_PREFER_MULT_32x16)
- FIXP_SGL alpha_0 = FL2FXCONST_SGL(0.25f); /* used in smooth ChaosMeasure */
- FIXP_SGL alpha_1 = FL2FXCONST_SGL(1.0f-0.25f); /* used in smooth ChaosMeasure */
-#else
- FIXP_DBL alpha_0 = FL2FXCONST_DBL(0.25f); /* used in smooth ChaosMeasure */
- FIXP_DBL alpha_1 = FL2FXCONST_DBL(1.0f-0.25f); /* used in smooth ChaosMeasure */
-#endif
- INT numberOfLines = sfbOffset[sfbCnt];
-
- if (!usePns)
- return;
-
- C_ALLOC_SCRATCH_START(chaosMeasurePerLine, FIXP_DBL, (1024));
- /* calculate chaos measure */
- FDKaacEnc_CalculateChaosMeasure(spectrum,
- numberOfLines,
- chaosMeasurePerLine);
-
- /* smooth ChaosMeasure */
- for (j=1;j<numberOfLines;j++) {
- FIXP_DBL tmp = fMultDiv2(alpha_1, chaosMeasurePerLine[j]);
- chaosMeasurePerLine[j] = fMultAdd(tmp, alpha_0, chaosMeasurePerLine[j-1]);
- }
-
- 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, j;
-
- 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) */
-
- 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;
- }
-}
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