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+/* -----------------------------------------------------------------------------
+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
+----------------------------------------------------------------------------- */
+
+/******************* Library for basic calculation routines ********************
+
+   Author(s):   Matthias Hildenbrand
+
+   Description: Module to efficiently handle QMF data for multiple channels and
+                to share the data between e.g. SBR and MPS
+
+*******************************************************************************/
+
+#ifndef FDK_QMF_DOMAIN_H
+#define FDK_QMF_DOMAIN_H
+
+#include "qmf.h"
+
+typedef enum {
+  QMF_DOMAIN_OK = 0x0, /*!< No error occurred. */
+  QMF_DOMAIN_OUT_OF_MEMORY =
+      0x1, /*!< QMF-Configuration demands for more memory than allocated on
+              heap. */
+  QMF_DOMAIN_INIT_ERROR =
+      0x2, /*!< An error during filterbank-setup occurred. */
+  QMF_DOMAIN_RESAMPLER_INIT_ERROR =
+      0x3 /*!< An error during QMF-resampler-setup occurred. */
+} QMF_DOMAIN_ERROR;
+
+#define CMPLX_MOD (2)
+
+#define QMF_MAX_WB_SECTIONS (5) /* maximum number of workbuffer sections */
+#define QMF_WB_SECTION_SIZE (1024 * 2)
+
+H_ALLOC_MEM_OVERLAY(QmfWorkBufferCore1, FIXP_DBL)
+H_ALLOC_MEM_OVERLAY(QmfWorkBufferCore2, FIXP_DBL)
+H_ALLOC_MEM_OVERLAY(QmfWorkBufferCore3, FIXP_DBL)
+H_ALLOC_MEM_OVERLAY(QmfWorkBufferCore4, FIXP_DBL)
+H_ALLOC_MEM_OVERLAY(QmfWorkBufferCore5, FIXP_DBL)
+H_ALLOC_MEM_OVERLAY(QmfWorkBufferCore6, FIXP_DBL)
+
+#define QMF_DOMAIN_MAX_ANALYSIS_QMF_BANDS (64)
+#define QMF_DOMAIN_MAX_SYNTHESIS_QMF_BANDS (QMF_MAX_SYNTHESIS_BANDS)
+#define QMF_DOMAIN_MAX_QMF_PROC_BANDS (64)
+#define QMF_DOMAIN_MAX_TIMESLOTS (64)
+#define QMF_DOMAIN_MAX_OV_TIMESLOTS (12)
+
+#define QMF_DOMAIN_ANALYSIS_QMF_BANDS_16 (16)
+#define QMF_DOMAIN_ANALYSIS_QMF_BANDS_24 (24)
+#define QMF_DOMAIN_ANALYSIS_QMF_BANDS_32 (32)
+
+#define QMF_DOMAIN_TIMESLOTS_16 (16)
+#define QMF_DOMAIN_TIMESLOTS_32 (32)
+
+#define QMF_DOMAIN_OV_TIMESLOTS_16 (3)
+#define QMF_DOMAIN_OV_TIMESLOTS_32 (6)
+
+H_ALLOC_MEM(AnaQmfStates, FIXP_QAS)
+H_ALLOC_MEM(SynQmfStates, FIXP_QSS)
+H_ALLOC_MEM(QmfSlotsReal, FIXP_DBL *)
+H_ALLOC_MEM(QmfSlotsImag, FIXP_DBL *)
+H_ALLOC_MEM(QmfOverlapBuffer, FIXP_DBL)
+
+H_ALLOC_MEM(AnaQmfStates16, FIXP_QAS)
+H_ALLOC_MEM(AnaQmfStates24, FIXP_QAS)
+H_ALLOC_MEM(AnaQmfStates32, FIXP_QAS)
+H_ALLOC_MEM(QmfSlotsReal16, FIXP_DBL *)
+H_ALLOC_MEM(QmfSlotsReal32, FIXP_DBL *)
+H_ALLOC_MEM(QmfSlotsImag16, FIXP_DBL *)
+H_ALLOC_MEM(QmfSlotsImag32, FIXP_DBL *)
+H_ALLOC_MEM(QmfOverlapBuffer16, FIXP_DBL)
+H_ALLOC_MEM(QmfOverlapBuffer32, FIXP_DBL)
+
+#define QDOM_PCM INT_PCM
+
+/**
+ * Structure to hold the configuration data which is global whithin a QMF domain
+ * instance.
+ */
+typedef struct {
+  UCHAR qmfDomainExplicitConfig;   /*!< Flag to signal that QMF domain is set
+                                      explicitly instead of SBR and MPS init
+                                      routines. */
+  UCHAR nInputChannels;            /*!< Number of QMF input channels. */
+  UCHAR nInputChannels_requested;  /*!< Corresponding requested not yet active
+                                      configuration parameter. */
+  UCHAR nOutputChannels;           /*!< Number of QMF output channels. */
+  UCHAR nOutputChannels_requested; /*!< Corresponding requested not yet active
+                                      configuration parameter. */
+  UCHAR
+  parkChannel; /*!< signal to automatically allocate additional memory to
+                  park a channel if only one processing channel is
+                  available. */
+  UCHAR parkChannel_requested;
+  QDOM_PCM
+  *TDinput; /*!< Pointer to time domain data used as input for the QMF
+               analysis. */
+  FIXP_DBL *
+      pWorkBuffer[QMF_MAX_WB_SECTIONS]; /*!< Pointerarray to volatile memory. */
+  UINT flags; /*!< Flags to be set on all QMF analysis/synthesis filter
+                 instances. */
+  UINT flags_requested; /*!< Corresponding requested not yet active
+                           configuration parameter. */
+  UCHAR nBandsAnalysis; /*!< Number of QMF analysis bands for all input
+                           channels. */
+  UCHAR nBandsAnalysis_requested; /*!< Corresponding requested not yet active
+                                     configuration parameter. */
+  USHORT nBandsSynthesis; /*!< Number of QMF synthesis bands for all output
+                             channels. */
+  USHORT
+  nBandsSynthesis_requested; /*!< Corresponding requested not yet active
+                                configuration parameter. */
+  UCHAR nQmfTimeSlots; /*!< Number of QMF time slots (stored in work buffer
+                          memory). */
+  UCHAR nQmfTimeSlots_requested; /*!< Corresponding requested not yet active
+                                    configuration parameter. */
+  UCHAR
+  nQmfOvTimeSlots; /*!< Number of QMF overlap/delay time slots (stored in
+                      persistent memory). */
+  UCHAR nQmfOvTimeSlots_requested; /*!< Corresponding requested not yet active
+                                      configuration parameter. */
+  UCHAR nQmfProcBands; /*!< Number of QMF bands which are processed by the
+                          decoder. Typically this is equal to nBandsSynthesis
+                          but it may differ if the QMF based resampler is being
+                          used. */
+  UCHAR nQmfProcBands_requested; /*!< Corresponding requested not yet active
+                                    configuration parameter. */
+  UCHAR
+  nQmfProcChannels; /*!< Number of complete QMF channels which need to
+                       coexist in memory at the same time. For most cases
+                       this is 1 which means the work buffer can be shared
+                       between audio channels. */
+  UCHAR
+  nQmfProcChannels_requested; /*!< Corresponding requested not yet active
+                                 configuration parameter. */
+} FDK_QMF_DOMAIN_GC;
+typedef FDK_QMF_DOMAIN_GC *HANDLE_FDK_QMF_DOMAIN_GC;
+
+/**
+ * Structure representing one QMF input channel. This includes the QMF analysis
+ * and the QMF domain data representation needed by the codec. Work buffer data
+ * may be shared between channels if the codec processes all QMF channels in a
+ * consecutive order.
+ */
+typedef struct {
+  HANDLE_FDK_QMF_DOMAIN_GC
+  pGlobalConf;               /*!< Pointer to global configuration structure. */
+  QMF_FILTER_BANK fb;        /*!< QMF (analysis) filter bank structure. */
+  QMF_SCALE_FACTOR scaling;  /*!< Structure with scaling information. */
+  UCHAR workBuf_nTimeSlots;  /*!< Work buffer dimension for this channel is
+                                (workBuf_nTimeSlots * workBuf_nBands *
+                                CMPLX_MOD). */
+  UCHAR workBuf_nBands;      /*!< Work buffer dimension for this channel is
+                                (workBuf_nTimeSlots * workBuf_nBands * CMPLX_MOD). */
+  USHORT workBufferOffset;   /*!< Offset within work buffer. */
+  USHORT workBufferSectSize; /*!< Size of work buffer section. */
+  FIXP_QAS *
+      pAnaQmfStates; /*!< Pointer to QMF analysis states (persistent memory). */
+  FIXP_DBL
+  *pOverlapBuffer;        /*!< Pointer to QMF overlap/delay memory (persistent
+                             memory). */
+  FIXP_DBL **pWorkBuffer; /*!< Pointer array to available work buffers. */
+  FIXP_DBL *
+      *hQmfSlotsReal; /*!< Handle for QMF real data time slot pointer array. */
+  FIXP_DBL **hQmfSlotsImag; /*!< Handle for QMF imaginary data time slot pointer
+                               array. */
+} FDK_QMF_DOMAIN_IN;
+typedef FDK_QMF_DOMAIN_IN *HANDLE_FDK_QMF_DOMAIN_IN;
+
+/**
+ * Structure representing one QMF output channel.
+ */
+typedef struct {
+  QMF_FILTER_BANK fb;      /*!< QMF (synthesis) filter bank structure. */
+  FIXP_QSS *pSynQmfStates; /*!< Pointer to QMF synthesis states (persistent
+                              memory). */
+} FDK_QMF_DOMAIN_OUT;
+typedef FDK_QMF_DOMAIN_OUT *HANDLE_FDK_QMF_DOMAIN_OUT;
+
+/**
+ * Structure representing the QMF domain for multiple channels.
+ */
+typedef struct {
+  FDK_QMF_DOMAIN_GC globalConf; /*!< Global configuration structure. */
+  FDK_QMF_DOMAIN_IN
+  QmfDomainIn[((8) + (1))]; /*!< Array of QMF domain input structures */
+  FDK_QMF_DOMAIN_OUT
+  QmfDomainOut[((8) + (1))]; /*!< Array of QMF domain output structures */
+} FDK_QMF_DOMAIN;
+typedef FDK_QMF_DOMAIN *HANDLE_FDK_QMF_DOMAIN;
+
+/**
+ * \brief Check whether analysis- and synthesis-filterbank-states have been
+ * initialized.
+ *
+ * \param qd Pointer to QMF domain structure.
+ *
+ * \return  1 if initialized, 0 else
+ */
+int FDK_QmfDomain_IsInitialized(const HANDLE_FDK_QMF_DOMAIN qd);
+
+/**
+ * \brief Initialize QMF analysis and synthesis filter banks and set up QMF data
+ * representation.
+ *
+ * \param qd Pointer to QMF domain structure.
+ * \param extra_flags Initialize filter banks with extra flags which were not
+ * set in the global config flags field.
+ *
+ * \return  0 on success.
+ */
+int FDK_QmfDomain_InitFilterBank(HANDLE_FDK_QMF_DOMAIN qd, UINT extra_flags);
+
+/**
+ * \brief When QMF processing of one channel is finished copy the overlap/delay
+ * part into the persistent memory to be used in the next frame.
+ *
+ * \param qd_ch Pointer to a QMF domain input channel.
+ * \param offset
+ *
+ * \return  void
+ */
+void FDK_QmfDomain_SaveOverlap(HANDLE_FDK_QMF_DOMAIN_IN qd_ch, int offset);
+
+/**
+ * \brief Get one slot of QMF data and adapt the scaling.
+ *
+ * \param qd_ch Pointer to a QMF domain input channel.
+ * \param ts Time slot number to be obtained.
+ * \param start_band Start index of QMF bands to be obtained.
+ * \param stop_band Stop index of QMF band to be obtained.
+ * \param pQmfOutReal Output buffer (real QMF data).
+ * \param pQmfOutImag  Output buffer (imag QMF data).
+ * \param exp_out Target exponent (scaling) of data.
+ *
+ * \return  void
+ */
+void FDK_QmfDomain_GetSlot(const HANDLE_FDK_QMF_DOMAIN_IN qd_ch, const int ts,
+                           const int start_band, const int stop_band,
+                           FIXP_DBL *pQmfOutReal, FIXP_DBL *pQmfOutImag,
+                           const int exp_out);
+
+/**
+ * \brief Direct access to the work buffer associated with a certain channel (no
+ * time slot pointer array is used).
+ *
+ * \param qd_ch Pointer to a QMF domain input channel.
+ * \param ts Time slot number to be obtained.
+ * \param ppQmfReal Returns the pointer to the requested part of the work buffer
+ * (real time slot).
+ * \param ppQmfImag Returns the pointer to the requested part of the work buffer
+ * (imag time slot).
+ *
+ * \return  void
+ */
+void FDK_QmfDomain_GetWorkBuffer(const HANDLE_FDK_QMF_DOMAIN_IN qd_ch,
+                                 const int ts, FIXP_DBL **ppQmfReal,
+                                 FIXP_DBL **ppQmfImag);
+
+/**
+ * \brief For the case that the work buffer associated to this channel is not
+ * identical to the processing channel work buffer copy the data into the
+ * processing channel.
+ *
+ * \param qd_ch Pointer to a QMF domain input channel.
+ * \return  void
+ */
+void FDK_QmfDomain_WorkBuffer2ProcChannel(const HANDLE_FDK_QMF_DOMAIN_IN qd_ch);
+
+/**
+ * \brief For the case of stereoCfgIndex3 with HBE the HBE buffer is copied into
+ * the processing channel work buffer and the processing channel work buffer is
+ * copied into the HBE buffer.
+ *
+ * \param qd_ch Pointer to a QMF domain input channel.
+ * \param ppQmfReal Pointer to a HBE QMF data buffer (real).
+ * \param ppQmfImag Pointer to a HBE QMF data buffer (imag).
+ *
+ * \return  void
+ */
+void FDK_QmfDomain_QmfData2HBE(HANDLE_FDK_QMF_DOMAIN_IN qd_ch,
+                               FIXP_DBL **ppQmfReal, FIXP_DBL **ppQmfImag);
+
+/**
+ * \brief Set all fields for requested parametervalues in global config struct
+ * FDK_QMF_DOMAIN_GC to 0.
+ *
+ * \param hgc  Pointer to a QMF domain global config struct.
+ */
+void FDK_QmfDomain_ClearRequested(HANDLE_FDK_QMF_DOMAIN_GC hgc);
+
+/**
+ * \brief Check for parameter-change requests in global config and
+ * (re-)configure QMF domain accordingly.
+ *
+ * \param  hqd  Pointer to QMF domain
+ *
+ * \return  errorcode
+ */
+QMF_DOMAIN_ERROR FDK_QmfDomain_Configure(HANDLE_FDK_QMF_DOMAIN hqd);
+
+/**
+ * \brief Free QMF workbuffer, QMF persistent memory and configuration
+ * variables.
+ *
+ * \param  hqd  Pointer to QMF domain
+ */
+void FDK_QmfDomain_FreeMem(HANDLE_FDK_QMF_DOMAIN hqd);
+
+/**
+ * \brief Clear QMF overlap buffers and QMF filter bank states.
+ *
+ * \param  hqd  Pointer to QMF domain
+ */
+QMF_DOMAIN_ERROR FDK_QmfDomain_ClearPersistentMemory(HANDLE_FDK_QMF_DOMAIN hqd);
+
+/**
+ * \brief Free QMF workbuffer and QMF persistent memory.
+ *
+ * \param  hqd  Pointer to QMF domain
+ *
+ * \param  dmx_lp_mode  downmix low power mode flag
+ */
+void FDK_QmfDomain_Close(HANDLE_FDK_QMF_DOMAIN hqd);
+
+#endif /* FDK_QMF_DOMAIN_H */