path: root/libFDK/include/FDK_qmf_domain.h

/* -----------------------------------------------------------------------------
Software License for The Fraunhofer FDK AAC Codec Library for Android

© Copyright  1995 - 2019 Fraunhofer-Gesellschaft zur Förderung der angewandten
Forschung e.V. All rights reserved.

 1.    INTRODUCTION
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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
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specifications.

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Fraunhofer Institute for Integrated Circuits IIS
Attention: Audio and Multimedia Departments - FDK AAC LL
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----------------------------------------------------------------------------- */

/******************* 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(QmfWorkBufferCore3, FIXP_DBL)
H_ALLOC_MEM_OVERLAY(QmfWorkBufferCore4, FIXP_DBL)
H_ALLOC_MEM_OVERLAY(QmfWorkBufferCore6, FIXP_DBL)
H_ALLOC_MEM_OVERLAY(QmfWorkBufferCore7, 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_DBL)
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_DBL)
H_ALLOC_MEM(AnaQmfStates24, FIXP_DBL)
H_ALLOC_MEM(AnaQmfStates32, FIXP_DBL)
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_DBL *
      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 */