mirror of https://github.com/mstorsjo/fdk-aac.git
239 lines
8.9 KiB
C
239 lines
8.9 KiB
C
/* -----------------------------------------------------------------------------
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Software License for The Fraunhofer FDK AAC Codec Library for Android
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© Copyright 1995 - 2019 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 decoder library ******************************
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Author(s): Josef Hoepfl
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Description: Definition of constant tables
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*******************************************************************************/
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#ifndef AAC_ROM_H
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#define AAC_ROM_H
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#include "common_fix.h"
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#include "FDK_audio.h"
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#include "aacdec_hcr_types.h"
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#include "aacdec_hcrs.h"
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#define PCM_AAC LONG
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#define PCM_DEC FIXP_DBL
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#define MAXVAL_PCM_DEC MAXVAL_DBL
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#define MINVAL_PCM_DEC MINVAL_DBL
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#define FIXP_DBL2PCM_DEC(x) (x)
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#define PCM_DEC2FIXP_DBL(x) (x)
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#define PCM_DEC_BITS DFRACT_BITS
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#define PCM_DEC2FX_PCM(x) FX_DBL2FX_PCM(x)
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#define FX_PCM2PCM_DEC(x) FX_PCM2FX_DBL(x)
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#define AACDEC_MAX_CH_CONF 14
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#define AACDEC_CH_ELEMENTS_TAB_SIZE 7 /*!< Size of element tables */
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#define AAC_NF_NO_RANDOM_VAL \
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512 /*!< Size of random number array for noise floor */
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#define INV_QUANT_TABLESIZE 256
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extern const FIXP_DBL InverseQuantTable[INV_QUANT_TABLESIZE + 1];
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extern const FIXP_DBL MantissaTable[4][14];
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extern const SCHAR ExponentTable[4][14];
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#define NUM_LD_COEF_512 1536
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#define NUM_LD_COEF_480 1440
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/* Window table partition exponents. */
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#define WTS0 (1)
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#define WTS1 (0)
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#define WTS2 (-2)
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extern const FIXP_WTB LowDelaySynthesis512[1536];
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extern const FIXP_WTB LowDelaySynthesis480[1440];
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extern const FIXP_WTB LowDelaySynthesis256[768];
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extern const FIXP_WTB LowDelaySynthesis240[720];
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extern const FIXP_WTB LowDelaySynthesis160[480];
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extern const FIXP_WTB LowDelaySynthesis128[384];
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extern const FIXP_WTB LowDelaySynthesis120[360];
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typedef struct {
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const SHORT *sfbOffsetLong;
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const SHORT *sfbOffsetShort;
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UCHAR numberOfSfbLong;
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UCHAR numberOfSfbShort;
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} SFB_INFO;
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extern const SFB_INFO sfbOffsetTables[5][16];
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/* Huffman tables */
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enum { HuffmanBits = 2, HuffmanEntries = (1 << HuffmanBits) };
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typedef struct {
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const USHORT (*CodeBook)[HuffmanEntries];
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UCHAR Dimension;
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UCHAR numBits;
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UCHAR Offset;
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} CodeBookDescription;
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extern const CodeBookDescription AACcodeBookDescriptionTable[13];
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extern const CodeBookDescription AACcodeBookDescriptionSCL;
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extern const STATEFUNC aStateConstant2State[];
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extern const SCHAR aCodebook2StartInt[];
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extern const UCHAR aMinOfCbPair[];
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extern const UCHAR aMaxOfCbPair[];
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extern const UCHAR aMaxCwLen[];
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extern const UCHAR aDimCb[];
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extern const UCHAR aDimCbShift[];
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extern const UCHAR aSignCb[];
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extern const UCHAR aCbPriority[];
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extern const UINT *aHuffTable[];
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extern const SCHAR *aQuantTable[];
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extern const USHORT aLargestAbsoluteValue[];
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extern const UINT aHuffTreeRvlcEscape[];
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extern const UINT aHuffTreeRvlCodewds[];
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extern const UCHAR tns_max_bands_tbl[13][2];
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extern const UCHAR tns_max_bands_tbl_480[13];
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extern const UCHAR tns_max_bands_tbl_512[13];
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#define FIXP_TCC FIXP_DBL
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extern const FIXP_TCC FDKaacDec_tnsCoeff3[8];
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extern const FIXP_TCC FDKaacDec_tnsCoeff4[16];
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extern const UCHAR FDKaacDec_tnsCoeff3_gain_ld[];
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extern const UCHAR FDKaacDec_tnsCoeff4_gain_ld[];
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extern const USHORT AacDec_randomSign[AAC_NF_NO_RANDOM_VAL / 16];
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extern const FIXP_DBL pow2_div24minus1[47];
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extern const int offsetTab[2][16];
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/* Channel mapping indices for time domain I/O.
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The first dimension is the channel configuration index. */
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extern const UCHAR channelMappingTablePassthrough[15][8];
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extern const UCHAR channelMappingTableWAV[15][8];
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/* Lookup tables for elements in ER bitstream */
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extern const MP4_ELEMENT_ID elementsTab[AACDEC_MAX_CH_CONF]
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[AACDEC_CH_ELEMENTS_TAB_SIZE];
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#define SF_FNA_COEFFS \
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1 /* Compile-time prescaler for MDST-filter coefficients. */
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/* SF_FNA_COEFFS > 0 should only be considered for FIXP_DBL-coefficients */
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/* (i.e. if CPLX_PRED_FILTER_16BIT is not defined). */
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/* With FIXP_DBL loss of precision is possible for SF_FNA_COEFFS > 11. */
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#ifdef CPLX_PRED_FILTER_16BIT
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#define FIXP_FILT FIXP_SGL
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#define FILT(a) ((FL2FXCONST_SGL(a)) >> SF_FNA_COEFFS)
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#else
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#define FIXP_FILT FIXP_DBL
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#define FILT(a) ((FL2FXCONST_DBL(a)) >> SF_FNA_COEFFS)
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#endif
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extern const FIXP_FILT mdst_filt_coef_curr[20][3]; /* MDST-filter coefficient
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tables used for current
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window */
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extern const FIXP_FILT mdst_filt_coef_prev[6][4]; /* MDST-filter coefficient
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tables used for previous
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window */
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#endif /* #ifndef AAC_ROM_H */
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