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172 lines
7.7 KiB
172 lines
7.7 KiB
/* -----------------------------------------------------------------------------
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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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/******************* Library for basic calculation routines ********************
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Author(s):
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Description: Library functions to calculate standard DCTs. This will most
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likely be replaced by hand-optimized functions for the specific
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target processor.
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*******************************************************************************/
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#ifndef DCT_H
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#define DCT_H
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#include "common_fix.h"
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void dct_getTables(const FIXP_WTP **ptwiddle, const FIXP_STP **sin_twiddle,
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int *sin_step, int length);
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/**
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* \brief Calculate DCT type II of given length. The DCT IV is
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* calculated by a complex FFT, with some pre and post twiddeling.
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* A factor of sqrt(2/(N-1)) is NOT applied.
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* \param pDat pointer to input/output data (in place processing).
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* \param size size of pDat.
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* \param pDat_e pointer to an integer containing the exponent of the data
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* referenced by pDat. The exponent is updated accordingly.
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*/
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void dct_II(FIXP_DBL *pDat, FIXP_DBL *tmp, int size, int *pDat_e);
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/**
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* \brief Calculate DCT type III of given length. The DCT IV is
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* calculated by a complex FFT, with some pre and post twiddeling.
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* Note that the factor 0.5 for the sum term x[0] is 1.0 instead of 0.5.
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* A factor of sqrt(2/N) is NOT applied.
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* \param pDat pointer to input/output data (in place processing).
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* \param size size of pDat.
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* \param pDat_e pointer to an integer containing the exponent of the data
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* referenced by pDat. The exponent is updated accordingly.
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*/
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void dct_III(FIXP_DBL *pDat, FIXP_DBL *tmp, int size, int *pDat_e);
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/**
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* \brief Calculate DST type III of given length. The DST III is
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* calculated by a DCT III of mirrored input and sign-flipping of odd
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* output coefficients.
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* Note that the factor 0.5 for the sum term x[N-1] is 1.0 instead of
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* 0.5. A factor of sqrt(2/N) is NOT applied.
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* \param pDat pointer to input/output data (in place processing).
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* \param size size of pDat.
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* \param pDat_e pointer to an integer containing the exponent of the data
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* referenced by pDat. The exponent is updated accordingly.
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*/
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void dst_III(FIXP_DBL *pDat, FIXP_DBL *tmp, int size, int *pDat_e);
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/**
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* \brief Calculate DCT type IV of given length. The DCT IV is
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* calculated by a complex FFT, with some pre and post twiddeling.
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* A factor of sqrt(2/N) is NOT applied.
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* \param pDat pointer to input/output data (in place processing).
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* \param size size of pDat.
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* \param pDat_e pointer to an integer containing the exponent of the data
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* referenced by pDat. The exponent is updated accordingly.
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*/
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void dct_IV(FIXP_DBL *pDat, int size, int *pDat_e);
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/**
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* \brief Calculate DST type IV of given length. The DST IV is
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* calculated by a complex FFT, with some pre and post twiddeling.
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* A factor of sqrt(2/N) is NOT applied.
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* \param pDat pointer to input/output data (in place processing).
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* \param size size of pDat.
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* \param pDat_e pointer to an integer containing the exponent of the data
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* referenced by pDat. The exponent is updated accordingly.
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*/
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void dst_IV(FIXP_DBL *pDat, int size, int *pDat_e);
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#endif
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