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Diffstat (limited to 'fdk-aac/libAACdec/src/stereo.h')
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diff --git a/fdk-aac/libAACdec/src/stereo.h b/fdk-aac/libAACdec/src/stereo.h new file mode 100644 index 0000000..af7a74f --- /dev/null +++ b/fdk-aac/libAACdec/src/stereo.h @@ -0,0 +1,211 @@ +/* ----------------------------------------------------------------------------- +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 */ |