xref: /aosp_15_r20/external/aac/libSBRenc/src/sbr.h (revision e54365361535b070c2db7374cec45c159c7d0e7a)

/* -----------------------------------------------------------------------------
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
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however caused and on any theory of liability, whether in contract, strict
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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 encoder library ******************************

   Author(s):

   Description:

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

/*!
  \file
  \brief  Main SBR structs definitions $Revision: 92790 $
*/

#ifndef SBR_H
#define SBR_H

#include "fram_gen.h"
#include "bit_sbr.h"
#include "tran_det.h"
#include "code_env.h"
#include "env_est.h"
#include "cmondata.h"

#include "qmf.h"
#include "resampler.h"

#include "ton_corr.h"

/* SBR bitstream delay */
#define MAX_DELAY_FRAMES 2

/* sbr encoder downsampling type */
typedef enum { SBRENC_DS_NONE, SBRENC_DS_TIME, SBRENC_DS_QMF } SBRENC_DS_TYPE;

typedef struct SBR_CHANNEL {
  struct ENV_CHANNEL hEnvChannel;
  // INT_PCM                  *pDSOutBuffer;            /**< Pointer to
  // downsampled audio output of SBR encoder */
  DOWNSAMPLER downSampler;

} SBR_CHANNEL;
typedef SBR_CHANNEL* HANDLE_SBR_CHANNEL;

typedef struct SBR_ELEMENT {
  HANDLE_SBR_CHANNEL sbrChannel[2];
  QMF_FILTER_BANK* hQmfAnalysis[2];
  SBR_CONFIG_DATA sbrConfigData;
  SBR_HEADER_DATA sbrHeaderData;
  SBR_BITSTREAM_DATA sbrBitstreamData;
  COMMON_DATA CmonData;
  INT dynXOverFreqDelay[5]; /**< to delay a frame (I don't like it that much
                               that way - hrc) */
  SBR_ELEMENT_INFO elInfo;

  UCHAR payloadDelayLine[1 + MAX_DELAY_FRAMES][MAX_PAYLOAD_SIZE];
  UINT payloadDelayLineSize[1 + MAX_DELAY_FRAMES]; /* Sizes in bits */

} SBR_ELEMENT, *HANDLE_SBR_ELEMENT;

typedef struct SBR_ENCODER {
  HANDLE_SBR_ELEMENT sbrElement[(8)];
  HANDLE_SBR_CHANNEL pSbrChannel[(8)];
  QMF_FILTER_BANK QmfAnalysis[(8)];
  DOWNSAMPLER lfeDownSampler;
  int lfeChIdx;     /* -1 default for no lfe, else assign channel index. */
  int noElements;   /* Number of elements. */
  int nChannels;    /* Total channel count across all elements. */
  int frameSize;    /* SBR framelength. */
  int bufferOffset; /* Offset for SBR parameter extraction in time domain input
                       buffer. */
  int downsampledOffset; /* Offset of downsampled/mixed output for core encoder.
                          */
  int downmixSize;       /* Size in samples of downsampled/mixed output for core
                            encoder. */
  INT downSampleFactor;  /* Sampling rate relation between the SBR and the core
                            encoder. */
  SBRENC_DS_TYPE
  downsamplingMethod; /* Method of downsmapling, time-domain, QMF or none.
                       */
  int nBitstrDelay;   /* Amount of SBR frames to be delayed in bitstream domain.
                       */
  int sbrDecDelay;    /* SBR decoder delay in samples */
  INT estimateBitrate; /* Estimate bitrate of SBR encoder. */
  INT inputDataDelay;  /* Delay caused by downsampler, in/out buffer at
                          sbrEncoder_EncodeFrame. */

  UCHAR* dynamicRam;
  UCHAR* pSBRdynamic_RAM;

  HANDLE_PARAMETRIC_STEREO hParametricStereo;
  QMF_FILTER_BANK qmfSynthesisPS;

  /* parameters describing allocation volume of present instance */
  INT maxElements;
  INT maxChannels;
  INT supportPS;

} SBR_ENCODER;

#endif /* SBR_H */