mirror of https://github.com/mstorsjo/fdk-aac.git
212 lines
8.9 KiB
C
212 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 - 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 decoder library ******************************
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Author(s): Josef Hoepfl
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Description: joint stereo processing
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*******************************************************************************/
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#ifndef STEREO_H
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#define STEREO_H
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#include "machine_type.h"
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#include "FDK_bitstream.h"
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#include "common_fix.h"
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#define SFB_PER_PRED_BAND 2
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#define SR_FNA_OUT \
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0 /* Additional scaling of the CJointStereo_filterAndAdd()-output to avoid \
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overflows. */
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/* The scaling factor can be set to 0 if the coefficients are prescaled
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* appropriately. */
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/* Prescaling via factor SF_FNA_COEFFS is done at compile-time but should only
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* be */
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/* utilized if the coefficients are stored as FIXP_DBL. (cp. aac_rom.cpp/.h) */
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/* The NO_CPLX_PRED_BUGFIX-switch was introduced to enable decoding of
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conformance-streams in way that they are comparable to buggy
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reference-streams. This is established by storing the prediction direction
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for computation of the "downmix MDCT of previous frame". This is not standard
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compliant. Once correct reference-streams for complex-stereo-prediction are
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available this switch becomes obsolete.
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*/
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/*#define NO_CPLX_PRED_BUGFIX*/
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enum { JointStereoMaximumGroups = 8, JointStereoMaximumBands = 64 };
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typedef struct {
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UCHAR pred_dir; // 0 = prediction from mid to side channel, 1 = vice versa
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UCHAR
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igf_pred_dir; // 0 = prediction from mid to side channel, 1 = vice versa
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UCHAR complex_coef; // 0 = alpha_q_im[x] is 0 for all prediction bands, 1 =
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// alpha_q_im[x] is transmitted via bitstream
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UCHAR use_prev_frame; // 0 = use current frame for MDST estimation, 1 = use
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// current and previous frame
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SHORT alpha_q_re[JointStereoMaximumGroups][JointStereoMaximumBands];
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SHORT alpha_q_im[JointStereoMaximumGroups][JointStereoMaximumBands];
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} CCplxPredictionData;
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/* joint stereo scratch memory (valid for this frame) */
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typedef struct {
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UCHAR MsMaskPresent;
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UCHAR MsUsed[JointStereoMaximumBands]; /*!< every arry element contains flags
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for up to 8 groups. this array is
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also utilized for complex stereo
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prediction. */
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UCHAR IGF_MsMaskPresent;
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UCHAR cplx_pred_flag; /* stereo complex prediction was signalled for this
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frame */
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UCHAR igf_cplx_pred_flag;
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/* The following array and variable are needed for the case when INF is
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* active */
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FIXP_DBL store_dmx_re_prev[1024];
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SHORT store_dmx_re_prev_e;
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} CJointStereoData;
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/* joint stereo persistent memory */
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typedef struct {
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UCHAR clearSpectralCoeffs; /* indicates that the spectral coeffs must be
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cleared because the transform splitting active
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flag of the left and right channel was different
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*/
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FIXP_DBL *scratchBuffer; /* pointer to scratch buffer */
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FIXP_DBL
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*spectralCoeffs[2]; /* spectral coefficients of this channel utilized by
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complex stereo prediction */
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SHORT *specScale[2];
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SHORT alpha_q_re_prev[JointStereoMaximumGroups][JointStereoMaximumBands];
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SHORT alpha_q_im_prev[JointStereoMaximumGroups][JointStereoMaximumBands];
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UCHAR winSeqPrev;
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UCHAR winShapePrev;
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UCHAR winGroupsPrev;
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} CJointStereoPersistentData;
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/*!
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\brief Read joint stereo data from bitstream
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The function reads joint stereo data from bitstream.
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\param bs bit stream handle data source.
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\param pJointStereoData pointer to stereo data structure to receive decoded
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data. \param windowGroups number of window groups. \param
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scaleFactorBandsTransmitted number of transmitted scalefactor bands. \param
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flags decoder flags
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\return 0 on success, -1 on error.
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*/
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int CJointStereo_Read(HANDLE_FDK_BITSTREAM bs,
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CJointStereoData *pJointStereoData,
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const int windowGroups,
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const int scaleFactorBandsTransmitted,
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const int max_sfb_ste_clear,
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CJointStereoPersistentData *pJointStereoPersistentData,
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CCplxPredictionData *cplxPredictionData,
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int cplxPredictionActiv, int scaleFactorBandsTotal,
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int windowSequence, const UINT flags);
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#endif /* #ifndef STEREO_H */
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