/* ----------------------------------------------------------------------------- Software License for The Fraunhofer FDK AAC Codec Library for Android © Copyright 1995 - 2018 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 ----------------------------------------------------------------------------- */ /**************************** AAC decoder library ****************************** Author(s): Josef Hoepfl Description: joint stereo processing *******************************************************************************/ #ifndef STEREO_H #define STEREO_H #include "machine_type.h" #include "FDK_bitstream.h" #include "common_fix.h" #define SFB_PER_PRED_BAND 2 #define SR_FNA_OUT \ 0 /* Additional scaling of the CJointStereo_filterAndAdd()-output to avoid \ overflows. */ /* The scaling factor can be set to 0 if the coefficients are prescaled * appropriately. */ /* Prescaling via factor SF_FNA_COEFFS is done at compile-time but should only * be */ /* utilized if the coefficients are stored as FIXP_DBL. (cp. aac_rom.cpp/.h) */ /* The NO_CPLX_PRED_BUGFIX-switch was introduced to enable decoding of conformance-streams in way that they are comparable to buggy reference-streams. This is established by storing the prediction direction for computation of the "downmix MDCT of previous frame". This is not standard compliant. Once correct reference-streams for complex-stereo-prediction are available this switch becomes obsolete. */ /*#define NO_CPLX_PRED_BUGFIX*/ enum { JointStereoMaximumGroups = 8, JointStereoMaximumBands = 64 }; typedef struct { UCHAR pred_dir; // 0 = prediction from mid to side channel, 1 = vice versa UCHAR igf_pred_dir; // 0 = prediction from mid to side channel, 1 = vice versa UCHAR complex_coef; // 0 = alpha_q_im[x] is 0 for all prediction bands, 1 = // alpha_q_im[x] is transmitted via bitstream UCHAR use_prev_frame; // 0 = use current frame for MDST estimation, 1 = use // current and previous frame SHORT alpha_q_re[JointStereoMaximumGroups][JointStereoMaximumBands]; SHORT alpha_q_im[JointStereoMaximumGroups][JointStereoMaximumBands]; } CCplxPredictionData; /* joint stereo scratch memory (valid for this frame) */ typedef struct { UCHAR MsMaskPresent; UCHAR MsUsed[JointStereoMaximumBands]; /*!< every arry element contains flags for up to 8 groups. this array is also utilized for complex stereo prediction. */ UCHAR IGF_MsMaskPresent; UCHAR cplx_pred_flag; /* stereo complex prediction was signalled for this frame */ UCHAR igf_cplx_pred_flag; /* The following array and variable are needed for the case when INF is * active */ FIXP_DBL store_dmx_re_prev[1024]; SHORT store_dmx_re_prev_e; } CJointStereoData; /* joint stereo persistent memory */ typedef struct { UCHAR clearSpectralCoeffs; /* indicates that the spectral coeffs must be cleared because the transform splitting active flag of the left and right channel was different */ FIXP_DBL *scratchBuffer; /* pointer to scratch buffer */ FIXP_DBL *spectralCoeffs[2]; /* spectral coefficients of this channel utilized by complex stereo prediction */ SHORT *specScale[2]; SHORT alpha_q_re_prev[JointStereoMaximumGroups][JointStereoMaximumBands]; SHORT alpha_q_im_prev[JointStereoMaximumGroups][JointStereoMaximumBands]; UCHAR winSeqPrev; UCHAR winShapePrev; UCHAR winGroupsPrev; } CJointStereoPersistentData; /*! \brief Read joint stereo data from bitstream The function reads joint stereo data from bitstream. \param bs bit stream handle data source. \param pJointStereoData pointer to stereo data structure to receive decoded data. \param windowGroups number of window groups. \param scaleFactorBandsTransmitted number of transmitted scalefactor bands. \param flags decoder flags \return 0 on success, -1 on error. */ int CJointStereo_Read(HANDLE_FDK_BITSTREAM bs, CJointStereoData *pJointStereoData, const int windowGroups, const int scaleFactorBandsTransmitted, const int max_sfb_ste_clear, CJointStereoPersistentData *pJointStereoPersistentData, CCplxPredictionData *cplxPredictionData, int cplxPredictionActiv, int scaleFactorBandsTotal, int windowSequence, const UINT flags); #endif /* #ifndef STEREO_H */