xref: /aosp_15_r20/external/aac/libSBRdec/include/sbrdecoder.h (revision e54365361535b070c2db7374cec45c159c7d0e7a)

/* -----------------------------------------------------------------------------
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
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
[email protected]
----------------------------------------------------------------------------- */

/**************************** SBR decoder library ******************************

   Author(s):

   Description: SBR decoder front-end prototypes and definitions.

*******************************************************************************/

#ifndef SBRDECODER_H
#define SBRDECODER_H

#include "common_fix.h"

#include "FDK_bitstream.h"
#include "FDK_audio.h"

#include "FDK_qmf_domain.h"

#define SBR_DEBUG_EXTHLP \
  "\
--- SBR ---\n\
    0x00000010 Ancillary data and SBR-Header\n\
    0x00000020 SBR-Side info\n\
    0x00000040 Decoded SBR-bitstream data, e.g. envelope data\n\
    0x00000080 SBR-Bitstream statistics\n\
    0x00000100 Miscellaneous SBR-messages\n\
    0x00000200 SBR-Energies and gains in the adjustor\n\
    0x00000400 Fatal SBR errors\n\
    0x00000800 Transposer coefficients for inverse filtering\n\
"

/* Capability flags */
#define CAPF_SBR_LP \
  0x00000001 /*!< Flag indicating library's capability of Low Power mode. */
#define CAPF_SBR_HQ                                                          \
  0x00000002 /*!< Flag indicating library's capability of High Quality mode. \
              */
#define CAPF_SBR_DRM_BS                                                        \
  0x00000004 /*!< Flag indicating library's capability to decode DRM SBR data. \
              */
#define CAPF_SBR_CONCEALMENT                                                \
  0x00000008 /*!< Flag indicating library's capability to conceal erroneous \
                frames.          */
#define CAPF_SBR_DRC                                                     \
  0x00000010 /*!< Flag indicating library's capability for Dynamic Range \
                Control.            */
#define CAPF_SBR_PS_MPEG                                                     \
  0x00000020 /*!< Flag indicating library's capability to do MPEG Parametric \
                Stereo.         */
#define CAPF_SBR_PS_DRM                                                     \
  0x00000040 /*!< Flag indicating library's capability to do DRM Parametric \
                Stereo.          */
#define CAPF_SBR_ELD_DOWNSCALE                                               \
  0x00000080 /*!< Flag indicating library's capability to do ELD decoding in \
                downscaled mode */
#define CAPF_SBR_HBEHQ                                                   \
  0x00000100 /*!< Flag indicating library's capability to do HQ Harmonic \
                transposing         */

typedef enum {
  SBRDEC_OK = 0, /*!< All fine. */
  /* SBRDEC_CONCEAL, */
  /* SBRDEC_NOSYNCH, */
  /* SBRDEC_ILLEGAL_PROGRAM, */
  /* SBRDEC_ILLEGAL_TAG, */
  /* SBRDEC_ILLEGAL_CHN_CONFIG, */
  /* SBRDEC_ILLEGAL_SECTION, */
  /* SBRDEC_ILLEGAL_SCFACTORS, */
  /* SBRDEC_ILLEGAL_PULSE_DATA, */
  /* SBRDEC_MAIN_PROFILE_NOT_IMPLEMENTED, */
  /* SBRDEC_GC_NOT_IMPLEMENTED, */
  /* SBRDEC_ILLEGAL_PLUS_ELE_ID, */
  SBRDEC_INVALID_ARGUMENT,   /*!<   */
  SBRDEC_CREATE_ERROR,       /*!<       */
  SBRDEC_NOT_INITIALIZED,    /*!<    */
  SBRDEC_MEM_ALLOC_FAILED,   /*!< Memory allocation failed. Probably not enough
                                memory available. */
  SBRDEC_PARSE_ERROR,        /*!<        */
  SBRDEC_UNSUPPORTED_CONFIG, /*!< */
  SBRDEC_SET_PARAM_FAIL,     /*!<     */
  SBRDEC_OUTPUT_BUFFER_TOO_SMALL /*!< */
} SBR_ERROR;

typedef enum {
  SBR_SYSTEM_BITSTREAM_DELAY, /*!< System: Switch to enable an additional SBR
                                 bitstream delay of one frame. */
  SBR_QMF_MODE,               /*!< Set QMF mode, either complex or low power. */
  SBR_LD_QMF_TIME_ALIGN, /*!< Set QMF type, either LD-MPS or CLDFB. Relevant for
                            ELD streams only. */
  SBR_FLUSH_DATA,     /*!< Set internal state to flush the decoder with the next
                         process call. */
  SBR_CLEAR_HISTORY,  /*!< Clear all internal states (delay lines, QMF states,
                         ...). */
  SBR_BS_INTERRUPTION /*!< Signal bit stream interruption. Value is ignored. */
  ,
  SBR_SKIP_QMF /*!< Enable skipping of QMF step: 1 skip analysis, 2 skip
                  synthesis */
} SBRDEC_PARAM;

typedef struct SBR_DECODER_INSTANCE *HANDLE_SBRDECODER;

#ifdef __cplusplus
extern "C" {
#endif

/**
 * \brief             Allocates and initializes one SBR decoder instance.
 * \param pSelf       Pointer to where a SBR decoder handle is copied into.
 * \param pQmfDomain  Pointer to QMF domain data structure.
 *
 * \return            Error code.
 */
SBR_ERROR sbrDecoder_Open(HANDLE_SBRDECODER *pSelf,
                          HANDLE_FDK_QMF_DOMAIN pQmfDomain);

/**
 * \brief  Initialize a SBR decoder runtime instance. Must be called before
 * decoding starts.
 *
 * \param self             Handle to a SBR decoder instance.
 * \param sampleRateIn     Input samplerate of the SBR decoder instance.
 * \param sampleRateOut    Output samplerate of the SBR decoder instance.
 * \param samplesPerFrame  Number of samples per frames.
 * \param coreCodec        Audio Object Type (AOT) of the core codec.
 * \param elementID        Table with MPEG-4 element Ids in canonical order.
 * \param elementIndex     SBR element index
 * \param harmonicSBR
 * \param stereoConfigIndex
 * \param downscaleFactor  ELD downscale factor
 * \param configMode       Table with MPEG-4 element Ids in canonical order.
 * \param configChanged    Flag that enforces a complete decoder reset.
 *
 * \return  Error code.
 */
SBR_ERROR sbrDecoder_InitElement(
    HANDLE_SBRDECODER self, const int sampleRateIn, const int sampleRateOut,
    const int samplesPerFrame, const AUDIO_OBJECT_TYPE coreCodec,
    const MP4_ELEMENT_ID elementID, const int elementIndex,
    const UCHAR harmonicSBR, const UCHAR stereoConfigIndex,
    const UCHAR configMode, UCHAR *configChanged, const INT downscaleFactor);

/**
 * \brief Free config dependent SBR memory.
 * \param self SBR decoder instance handle
 */
SBR_ERROR sbrDecoder_FreeMem(HANDLE_SBRDECODER *self);

/**
 * \brief pass out of band SBR header to SBR decoder
 *
 * \param self         Handle to a SBR decoder instance.
 * \param hBs          bit stream handle data source.
 * \param sampleRateIn SBR input sampling rate
 * \param sampleRateOut SBR output sampling rate
 * \param samplesPerFrame frame length
 * \param elementID    SBR element ID.
 * \param elementIndex SBR element index.
 * \param harmonicSBR
 * \param stereoConfigIndex
 * \param downscaleFactor  ELD downscale factor
 *
 * \return  Error code.
 */
INT sbrDecoder_Header(HANDLE_SBRDECODER self, HANDLE_FDK_BITSTREAM hBs,
                      const INT sampleRateIn, const INT sampleRateOut,
                      const INT samplesPerFrame,
                      const AUDIO_OBJECT_TYPE coreCodec,
                      const MP4_ELEMENT_ID elementID, const INT elementIndex,
                      const UCHAR harmonicSBR, const UCHAR stereoConfigIndex,
                      const UCHAR configMode, UCHAR *configChanged,
                      const INT downscaleFactor);

/**
 * \brief        Set a parameter of the SBR decoder runtime instance.
 * \param self   SBR decoder handle.
 * \param param  Parameter which will be set if successfull.
 * \param value  New parameter value.
 * \return       Error code.
 */
SBR_ERROR sbrDecoder_SetParam(HANDLE_SBRDECODER self, const SBRDEC_PARAM param,
                              const INT value);

/**
 * \brief  Feed DRC channel data into a SBR decoder runtime instance.
 *
 * \param self                    SBR decoder handle.
 * \param ch                      Channel number to which the DRC data is
 * associated to.
 * \param numBands                Number of DRC bands.
 * \param pNextFact_mag           Pointer to a table with the DRC factor
 * magnitudes.
 * \param nextFact_exp            Exponent for all DRC factors.
 * \param drcInterpolationScheme  DRC interpolation scheme.
 * \param winSequence             Window sequence from core coder (eight short
 * or one long window).
 * \param pBandTop                Pointer to a table with the top borders for
 * all DRC bands.
 *
 * \return  Error code.
 */
SBR_ERROR sbrDecoder_drcFeedChannel(HANDLE_SBRDECODER self, INT ch,
                                    UINT numBands, FIXP_DBL *pNextFact_mag,
                                    INT nextFact_exp,
                                    SHORT drcInterpolationScheme,
                                    UCHAR winSequence, USHORT *pBandTop);

/**
 * \brief  Disable SBR DRC for a certain channel.
 *
 * \param hSbrDecoder  SBR decoder handle.
 * \param ch           Number of the channel that has to be disabled.
 *
 * \return  None.
 */
void sbrDecoder_drcDisable(HANDLE_SBRDECODER self, INT ch);

/**
 * \brief  Parse one SBR element data extension data block. The bit stream
 * position will be placed at the end of the SBR payload block. The remaining
 * bits will be returned into *count if a payload length is given
 * (byPayLen > 0). If no SBR payload length is given (bsPayLen < 0) then
 * the bit stream position on return will be random after this function
 * call in case of errors, and any further decoding will be completely
 * pointless. This function accepts either normal ordered SBR data or reverse
 * ordered DRM SBR data.
 *
 * \param self           SBR decoder handle.
 * \param hBs            Bit stream handle as data source.
 * \param count          Pointer to an integer where the amount of parsed SBR
 * payload bits is stored into.
 * \param bsPayLen       If > 0 this value is the SBR payload length. If < 0,
 * the SBR payload length is unknown.
 * \param flags          CRC flag (0: EXT_SBR_DATA; 1: EXT_SBR_DATA_CRC)
 * \param prev_element   Previous MPEG-4 element ID.
 * \param element_index  Index of the current element.
 * \param acFlags        Audio codec flags
 *
 * \return  Error code.
 */
SBR_ERROR sbrDecoder_Parse(HANDLE_SBRDECODER self, HANDLE_FDK_BITSTREAM hBs,
                           UCHAR *pDrmBsBuffer, USHORT drmBsBufferSize,
                           int *count, int bsPayLen, int crcFlag,
                           MP4_ELEMENT_ID prev_element, int element_index,
                           UINT acFlags, UINT acElFlags[]);

/**
 * \brief  This function decodes the given SBR bitstreams and applies SBR to the
 * given time data.
 *
 * SBR-processing works InPlace. I.e. the calling function has to provide
 * a time domain buffer timeData which can hold the completely decoded
 * result.
 *
 * Left and right channel are read and stored according to the
 * interleaving flag, frame length and number of channels.
 *
 * \param self            Handle of an open SBR decoder instance.
 * \param hSbrBs          SBR Bitstream handle.
 * \param input           Pointer to input data.
 * \param timeData        Pointer to upsampled output data.
 * \param timeDataSize    Size of timeData.
 * \param numChannels     Pointer to a buffer holding the number of channels in
 * time data buffer.
 * \param sampleRate      Output samplerate.
 * \param channelMapping  Channel mapping indices.
 * \param coreDecodedOk   Flag indicating if the core decoder did not find any
 * error (0: core decoder found errors, 1: no errors).
 * \param psDecoded       Pointer to a buffer holding a flag. Input: PS is
 * possible, Output: PS has been rendered.
 * \param inDataHeadroom  Headroom of the SBR input time signal to prevent
 * clipping.
 * \param outDataHeadroom Pointer to headroom of the SBR output time signal to
 * prevent clipping.
 *
 * \return  Error code.
 */
SBR_ERROR sbrDecoder_Apply(HANDLE_SBRDECODER self, LONG *input, LONG *timeData,
                           const int timeDataSize, int *numChannels,
                           int *sampleRate,
                           const FDK_channelMapDescr *const mapDescr,
                           const int mapIdx, const int coreDecodedOk,
                           UCHAR *psDecoded, const INT inDataHeadroom,
                           INT *outDataHeadroom);

/**
 * \brief       Close SBR decoder instance and free memory.
 * \param self  SBR decoder handle.
 * \return      Error Code.
 */
SBR_ERROR sbrDecoder_Close(HANDLE_SBRDECODER *self);

/**
 * \brief       Get SBR decoder library information.
 * \param info  Pointer to a LIB_INFO struct, where library information is
 * written to.
 * \return      0 on success, -1 if invalid handle or if no free element is
 * available to write information to.
 */
INT sbrDecoder_GetLibInfo(LIB_INFO *info);

/**
 * \brief       Determine the modules output signal delay in samples.
 * \param self  SBR decoder handle.
 * \return      The number of samples signal delay added by the module.
 */
UINT sbrDecoder_GetDelay(const HANDLE_SBRDECODER self);

#ifdef __cplusplus
}
#endif

#endif