/* -----------------------------------------------------------------------------
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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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/**************************** SBR decoder library ******************************
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Author(s):
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Description:
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*******************************************************************************/
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/*!
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\file
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\brief Sbr decoder
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*/
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#ifndef PSDEC_H
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#define PSDEC_H
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#include "sbrdecoder.h"
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#include "FDK_hybrid.h"
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#include "FDK_decorrelate.h"
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/* This PS decoder implements the baseline version. So it always uses the */
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/* hybrid filter structure for 20 stereo bands and does not implemet IPD/OPD */
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/* synthesis. The baseline version has to support the complete PS bitstream */
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/* syntax. But IPD/OPD data is ignored and set to 0. If 34 stereo band config */
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/* is used in the bitstream for IIS/ICC the decoded parameters are mapped to */
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/* 20 stereo bands. */
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#include "FDK_bitstream.h"
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#define SCAL_HEADROOM (2)
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#define PS_EXTENSION_SIZE_BITS (4)
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#define PS_EXTENSION_ESC_COUNT_BITS (8)
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#define NO_QMF_CHANNELS (64)
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#define MAX_NUM_COL (32)
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#define NO_QMF_BANDS_HYBRID20 (3)
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#define NO_SUB_QMF_CHANNELS (12)
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#define HYBRID_FILTER_DELAY (6)
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#define MAX_NO_PS_ENV (4 + 1) /* +1 needed for VAR_BORDER */
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#define NO_HI_RES_BINS (34)
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#define NO_MID_RES_BINS (20)
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#define NO_LOW_RES_BINS (10)
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#define NO_HI_RES_IID_BINS (NO_HI_RES_BINS)
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#define NO_HI_RES_ICC_BINS (NO_HI_RES_BINS)
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#define NO_MID_RES_IID_BINS (NO_MID_RES_BINS)
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#define NO_MID_RES_ICC_BINS (NO_MID_RES_BINS)
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#define NO_LOW_RES_IID_BINS (NO_LOW_RES_BINS)
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#define NO_LOW_RES_ICC_BINS (NO_LOW_RES_BINS)
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#define SUBQMF_GROUPS (10)
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#define QMF_GROUPS (12)
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//#define SUBQMF_GROUPS_HI_RES ( 32 )
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//#define QMF_GROUPS_HI_RES ( 18 )
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#define NO_IID_GROUPS (SUBQMF_GROUPS + QMF_GROUPS)
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//#define NO_IID_GROUPS_HI_RES ( SUBQMF_GROUPS_HI_RES +
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// QMF_GROUPS_HI_RES )
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#define NO_IID_STEPS (7) /* 1 .. + 7 */
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#define NO_IID_STEPS_FINE (15) /* 1 .. +15 */
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#define NO_ICC_STEPS (8) /* 0 .. + 7 */
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#define NO_IID_LEVELS (2 * NO_IID_STEPS + 1) /* - 7 .. + 7 */
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#define NO_IID_LEVELS_FINE (2 * NO_IID_STEPS_FINE + 1) /* -15 .. +15 */
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#define NO_ICC_LEVELS (NO_ICC_STEPS) /* 0 .. + 7 */
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#define FIXP_SQRT05 ((FIXP_DBL)0x5a827980) /* 1/SQRT2 */
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struct PS_DEC_COEFFICIENTS {
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FIXP_DBL H11r[NO_IID_GROUPS]; /*!< coefficients of the sub-subband groups */
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FIXP_DBL H12r[NO_IID_GROUPS]; /*!< coefficients of the sub-subband groups */
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FIXP_DBL H21r[NO_IID_GROUPS]; /*!< coefficients of the sub-subband groups */
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FIXP_DBL H22r[NO_IID_GROUPS]; /*!< coefficients of the sub-subband groups */
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FIXP_DBL
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DeltaH11r[NO_IID_GROUPS]; /*!< coefficients of the sub-subband groups */
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FIXP_DBL
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DeltaH12r[NO_IID_GROUPS]; /*!< coefficients of the sub-subband groups */
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FIXP_DBL
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DeltaH21r[NO_IID_GROUPS]; /*!< coefficients of the sub-subband groups */
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FIXP_DBL
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DeltaH22r[NO_IID_GROUPS]; /*!< coefficients of the sub-subband groups */
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SCHAR
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aaIidIndexMapped[MAX_NO_PS_ENV]
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[NO_HI_RES_IID_BINS]; /*!< The mapped IID index for all
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envelopes and all IID bins */
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SCHAR
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aaIccIndexMapped[MAX_NO_PS_ENV]
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[NO_HI_RES_ICC_BINS]; /*!< The mapped ICC index for all
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envelopes and all ICC bins */
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};
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typedef enum { ppt_none = 0, ppt_mpeg = 1, ppt_drm = 2 } PS_PAYLOAD_TYPE;
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typedef struct {
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UCHAR bPsHeaderValid; /*!< set if new header is available from bitstream */
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UCHAR bEnableIid; /*!< One bit denoting the presence of IID parameters */
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UCHAR bEnableIcc; /*!< One bit denoting the presence of ICC parameters */
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UCHAR bEnableExt; /*!< The PS extension layer is enabled using the enable_ext
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bit. If it is set to %1 the IPD and OPD parameters are
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sent. If it is disabled, i.e. %0, the extension layer is
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skipped. */
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UCHAR
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modeIid; /*!< The configuration of IID parameters (number of bands and
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quantisation grid, iid_quant) is determined by iid_mode. */
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UCHAR modeIcc; /*!< The configuration of Inter-channel Coherence parameters
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(number of bands and quantisation grid) is determined by
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icc_mode. */
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UCHAR freqResIid; /*!< 0=low, 1=mid or 2=high frequency resolution for iid */
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UCHAR freqResIcc; /*!< 0=low, 1=mid or 2=high frequency resolution for icc */
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UCHAR bFineIidQ; /*!< Use fine Iid quantisation. */
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UCHAR bFrameClass; /*!< The frame_class bit determines whether the parameter
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positions of the current frame are uniformly spaced
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accross the frame or they are defined using the
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positions described by border_position.
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*/
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UCHAR noEnv; /*!< The number of envelopes per frame */
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UCHAR aEnvStartStop[MAX_NO_PS_ENV + 1]; /*!< In case of variable parameter
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spacing the parameter positions are
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determined by border_position */
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SCHAR abIidDtFlag[MAX_NO_PS_ENV]; /*!< Deltacoding time/freq flag for IID, 0
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=> freq */
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SCHAR abIccDtFlag[MAX_NO_PS_ENV]; /*!< Deltacoding time/freq flag for ICC, 0
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=> freq */
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SCHAR
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aaIidIndex[MAX_NO_PS_ENV]
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[NO_HI_RES_IID_BINS]; /*!< The IID index for all envelopes and
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all IID bins */
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SCHAR
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aaIccIndex[MAX_NO_PS_ENV]
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[NO_HI_RES_ICC_BINS]; /*!< The ICC index for all envelopes and
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all ICC bins */
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} MPEG_PS_BS_DATA;
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struct PS_DEC {
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SCHAR noSubSamples;
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SCHAR noChannels;
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SCHAR procFrameBased; /*!< Helper to detected switching from frame based to
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slot based processing
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*/
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PS_PAYLOAD_TYPE
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bPsDataAvail[(1) + 1]; /*!< set if new data available from bitstream */
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UCHAR psDecodedPrv; /*!< set if PS has been processed in the last frame */
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/* helpers for frame delay line */
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UCHAR bsLastSlot; /*!< Index of last read slot. */
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UCHAR bsReadSlot; /*!< Index of current read slot for additional delay. */
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UCHAR processSlot; /*!< Index of current slot for processing (need for add.
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delay). */
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union { /* Bitstream data */
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MPEG_PS_BS_DATA
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mpeg; /*!< Struct containing all MPEG specific PS data from bitstream.
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*/
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} bsData[(1) + 1];
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shouldBeUnion { /* Static data */
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struct {
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SCHAR aIidPrevFrameIndex[NO_HI_RES_IID_BINS]; /*!< The IID index for
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previous frame */
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SCHAR aIccPrevFrameIndex[NO_HI_RES_ICC_BINS]; /*!< The ICC index for
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previous frame */
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UCHAR
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bPrevFrameFineIidQ; /*!< The IID quantization of the previous frame */
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UCHAR prevFreqResIid; /*!< Frequency resolution for IID of the previous
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frame */
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UCHAR prevFreqResIcc; /*!< Frequency resolution for ICC of the previous
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frame */
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UCHAR lastUsb; /*!< uppermost WMF delay band of last frame */
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FIXP_DBL pHybridAnaStatesLFdmx
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[2 * 13 * NO_QMF_BANDS_HYBRID20]; /*!< Memory used in hybrid analysis
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for filter states. */
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FDK_ANA_HYB_FILTER hybridAnalysis;
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FDK_SYN_HYB_FILTER hybridSynthesis[2];
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DECORR_DEC apDecor; /*!< Decorrelator instance. */
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FIXP_DBL decorrBufferCplx[(2 * ((825) + (373)))];
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FIXP_DBL h11rPrev[NO_IID_GROUPS]; /*!< previous calculated h(xy)
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coefficients */
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FIXP_DBL h12rPrev[NO_IID_GROUPS]; /*!< previous calculated h(xy)
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coefficients */
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FIXP_DBL h21rPrev[NO_IID_GROUPS]; /*!< previous calculated h(xy)
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coefficients */
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FIXP_DBL h22rPrev[NO_IID_GROUPS]; /*!< previous calculated h(xy)
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coefficients */
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PS_DEC_COEFFICIENTS
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*pCoef; /*!< temporal coefficients are on reusable scratch memory */
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} mpeg;
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}
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specificTo;
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};
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typedef struct PS_DEC *HANDLE_PS_DEC;
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int CreatePsDec(HANDLE_PS_DEC *h_PS_DEC, int aacSamplesPerFrame);
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int DeletePsDec(HANDLE_PS_DEC *h_PS_DEC);
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void PreparePsProcessing(HANDLE_PS_DEC h_ps_d,
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const FIXP_DBL *const *const rIntBufferLeft,
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const FIXP_DBL *const *const iIntBufferLeft,
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const int scaleFactorLowBand);
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void initSlotBasedRotation(HANDLE_PS_DEC h_ps_d, int env, int usb);
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void ApplyPsSlot(
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HANDLE_PS_DEC h_ps_d, /* parametric stereo decoder handle */
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FIXP_DBL **rIntBufferLeft, /* real values of left qmf timeslot */
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FIXP_DBL **iIntBufferLeft, /* imag values of left qmf timeslot */
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FIXP_DBL *rIntBufferRight, /* real values of right qmf timeslot */
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FIXP_DBL *iIntBufferRight, /* imag values of right qmf timeslot */
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const int scaleFactorLowBand_no_ov, const int scaleFactorLowBand,
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const int scaleFactorHighBand, const int lsb, const int usb);
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#endif /* PSDEC_H */
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