mirror of https://github.com/mstorsjo/fdk-aac.git
220 lines
9.1 KiB
C++
220 lines
9.1 KiB
C++
/* -----------------------------------------------------------------------------
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Software License for The Fraunhofer FDK AAC Codec Library for Android
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© Copyright 1995 - 2018 Fraunhofer-Gesellschaft zur Förderung der angewandten
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Forschung e.V. All rights reserved.
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1. INTRODUCTION
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The Fraunhofer FDK AAC Codec Library for Android ("FDK AAC Codec") is software
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that implements the MPEG Advanced Audio Coding ("AAC") encoding and decoding
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scheme for digital audio. This FDK AAC Codec software is intended to be used on
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a wide variety of Android devices.
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AAC's HE-AAC and HE-AAC v2 versions are regarded as today's most efficient
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general perceptual audio codecs. AAC-ELD is considered the best-performing
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full-bandwidth communications codec by independent studies and is widely
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deployed. AAC has been standardized by ISO and IEC as part of the MPEG
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specifications.
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Patent licenses for necessary patent claims for the FDK AAC Codec (including
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those of Fraunhofer) may be obtained through Via Licensing
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(www.vialicensing.com) or through the respective patent owners individually for
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the purpose of encoding or decoding bit streams in products that are compliant
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with the ISO/IEC MPEG audio standards. Please note that most manufacturers of
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Android devices already license these patent claims through Via Licensing or
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directly from the patent owners, and therefore FDK AAC Codec software may
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already be covered under those patent licenses when it is used for those
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licensed purposes only.
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Commercially-licensed AAC software libraries, including floating-point versions
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with enhanced sound quality, are also available from Fraunhofer. Users are
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encouraged to check the Fraunhofer website for additional applications
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information and documentation.
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2. COPYRIGHT LICENSE
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Redistribution and use in source and binary forms, with or without modification,
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are permitted without payment of copyright license fees provided that you
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satisfy the following conditions:
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You must retain the complete text of this software license in redistributions of
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the FDK AAC Codec or your modifications thereto in source code form.
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You must retain the complete text of this software license in the documentation
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and/or other materials provided with redistributions of the FDK AAC Codec or
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your modifications thereto in binary form. You must make available free of
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charge copies of the complete source code of the FDK AAC Codec and your
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modifications thereto to recipients of copies in binary form.
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The name of Fraunhofer may not be used to endorse or promote products derived
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from this library without prior written permission.
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You may not charge copyright license fees for anyone to use, copy or distribute
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the FDK AAC Codec software or your modifications thereto.
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Your modified versions of the FDK AAC Codec must carry prominent notices stating
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that you changed the software and the date of any change. For modified versions
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of the FDK AAC Codec, the term "Fraunhofer FDK AAC Codec Library for Android"
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must be replaced by the term "Third-Party Modified Version of the Fraunhofer FDK
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AAC Codec Library for Android."
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3. NO PATENT LICENSE
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NO EXPRESS OR IMPLIED LICENSES TO ANY PATENT CLAIMS, including without
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limitation the patents of Fraunhofer, ARE GRANTED BY THIS SOFTWARE LICENSE.
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Fraunhofer provides no warranty of patent non-infringement with respect to this
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software.
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You may use this FDK AAC Codec software or modifications thereto only for
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purposes that are authorized by appropriate patent licenses.
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4. DISCLAIMER
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This FDK AAC Codec software is provided by Fraunhofer on behalf of the copyright
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holders and contributors "AS IS" and WITHOUT ANY EXPRESS OR IMPLIED WARRANTIES,
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including but not limited to the implied warranties of merchantability and
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fitness for a particular purpose. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
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CONTRIBUTORS BE LIABLE for any direct, indirect, incidental, special, exemplary,
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or consequential damages, including but not limited to procurement of substitute
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goods or services; loss of use, data, or profits, or business interruption,
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however caused and on any theory of liability, whether in contract, strict
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liability, or tort (including negligence), arising in any way out of the use of
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this software, even if advised of the possibility of such damage.
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5. CONTACT INFORMATION
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Fraunhofer Institute for Integrated Circuits IIS
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Attention: Audio and Multimedia Departments - FDK AAC LL
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Am Wolfsmantel 33
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91058 Erlangen, Germany
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www.iis.fraunhofer.de/amm
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amm-info@iis.fraunhofer.de
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----------------------------------------------------------------------------- */
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/**************************** AAC encoder library ******************************
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Author(s): M. Werner
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Description: Convert chaos measure to the tonality index
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*******************************************************************************/
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#include "tonality.h"
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#include "chaosmeasure.h"
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#if defined(__arm__)
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#endif
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static const FIXP_DBL normlog =
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(FIXP_DBL)0xd977d949; /*FL2FXCONST_DBL(-0.4342944819f *
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FDKlog(2.0)/FDKlog(2.7182818)); */
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static void FDKaacEnc_CalcSfbTonality(FIXP_DBL *RESTRICT spectrum,
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INT *RESTRICT sfbMaxScaleSpec,
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FIXP_DBL *RESTRICT chaosMeasure,
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FIXP_SGL *RESTRICT sfbTonality,
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INT sfbCnt, const INT *RESTRICT sfbOffset,
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FIXP_DBL *RESTRICT sfbEnergyLD64);
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void FDKaacEnc_CalculateFullTonality(FIXP_DBL *RESTRICT spectrum,
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INT *RESTRICT sfbMaxScaleSpec,
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FIXP_DBL *RESTRICT sfbEnergyLD64,
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FIXP_SGL *RESTRICT sfbTonality, INT sfbCnt,
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const INT *sfbOffset, INT usePns) {
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INT j;
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INT numberOfLines = sfbOffset[sfbCnt];
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if (usePns) {
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C_ALLOC_SCRATCH_START(chaosMeasurePerLine, FIXP_DBL, (1024))
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/* calculate chaos measure */
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FDKaacEnc_CalculateChaosMeasure(spectrum, numberOfLines,
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chaosMeasurePerLine);
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/* smooth ChaosMeasure */
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FIXP_DBL left = chaosMeasurePerLine[0];
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FIXP_DBL right;
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for (j = 1; j < (numberOfLines - 1); j += 2) {
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right = chaosMeasurePerLine[j];
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right = right - (right >> 2);
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left = right + (left >> 2);
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chaosMeasurePerLine[j] = left; /* 0.25 left + 0.75 right */
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right = chaosMeasurePerLine[j + 1];
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right = right - (right >> 2);
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left = right + (left >> 2);
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chaosMeasurePerLine[j + 1] = left;
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}
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if (j == (numberOfLines - 1)) {
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right = chaosMeasurePerLine[j];
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right = right - (right >> 2);
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left = right + (left >> 2);
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chaosMeasurePerLine[j] = left;
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}
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FDKaacEnc_CalcSfbTonality(spectrum, sfbMaxScaleSpec, chaosMeasurePerLine,
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sfbTonality, sfbCnt, sfbOffset, sfbEnergyLD64);
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C_ALLOC_SCRATCH_END(chaosMeasurePerLine, FIXP_DBL, (1024))
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}
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}
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/*****************************************************************************
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functionname: CalculateTonalityIndex
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description: computes tonality values out of unpredictability values
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limits range and computes log()
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returns:
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input: ptr to energies, ptr to chaos measure values,
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number of sfb
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output: sfb wise tonality values
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*****************************************************************************/
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static void FDKaacEnc_CalcSfbTonality(FIXP_DBL *RESTRICT spectrum,
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INT *RESTRICT sfbMaxScaleSpec,
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FIXP_DBL *RESTRICT chaosMeasure,
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FIXP_SGL *RESTRICT sfbTonality,
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INT sfbCnt, const INT *RESTRICT sfbOffset,
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FIXP_DBL *RESTRICT sfbEnergyLD64) {
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INT i;
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for (i = 0; i < sfbCnt; i++) {
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FIXP_DBL chaosMeasureSfbLD64;
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INT shiftBits =
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fixMax(0, sfbMaxScaleSpec[i] -
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4); /* max sfbWidth = 96 ; 2^7=128 => 7/2 = 4 (spc*spc) */
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INT j;
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FIXP_DBL chaosMeasureSfb = FL2FXCONST_DBL(0.0);
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/* calc chaosMeasurePerSfb */
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for (j = (sfbOffset[i + 1] - sfbOffset[i]) - 1; j >= 0; j--) {
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FIXP_DBL tmp = (*spectrum++) << shiftBits;
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FIXP_DBL lineNrg = fMultDiv2(tmp, tmp);
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chaosMeasureSfb = fMultAddDiv2(chaosMeasureSfb, lineNrg, *chaosMeasure++);
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}
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/* calc tonalityPerSfb */
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if (chaosMeasureSfb != FL2FXCONST_DBL(0.0)) {
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/* add ld(convtone)/64 and 2/64 bec.fMultDiv2 */
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chaosMeasureSfbLD64 = CalcLdData((chaosMeasureSfb)) - sfbEnergyLD64[i];
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chaosMeasureSfbLD64 += FL2FXCONST_DBL(3.0f / 64) -
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((FIXP_DBL)(shiftBits) << (DFRACT_BITS - 6));
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if (chaosMeasureSfbLD64 >
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FL2FXCONST_DBL(-0.0519051)) /* > ld(0.05)+ld(2) */
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{
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if (chaosMeasureSfbLD64 <= FL2FXCONST_DBL(0.0))
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sfbTonality[i] =
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FX_DBL2FX_SGL(fMultDiv2(chaosMeasureSfbLD64, normlog) << 7);
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else
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sfbTonality[i] = FL2FXCONST_SGL(0.0);
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} else
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sfbTonality[i] = (FIXP_SGL)MAXVAL_SGL;
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} else
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sfbTonality[i] = (FIXP_SGL)MAXVAL_SGL;
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}
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}
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