xref: /aosp_15_r20/external/aac/libSBRdec/src/sbr_ram.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
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Your modified versions of the FDK AAC Codec must carry prominent notices stating
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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,
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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 decoder library ******************************

   Author(s):

   Description:

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

/*!
\file
\brief Memory layout
*/
#ifndef SBR_RAM_H
#define SBR_RAM_H

#include "sbrdecoder.h"

#include "env_extr.h"
#include "sbr_dec.h"

#define SBRDEC_MAX_CH_PER_ELEMENT (2)

#define FRAME_OK (0)
#define FRAME_ERROR (1)
#define FRAME_ERROR_ALLSLOTS (2)

typedef struct {
  SBR_CHANNEL *pSbrChannel[SBRDEC_MAX_CH_PER_ELEMENT];
  TRANSPOSER_SETTINGS
  transposerSettings; /* Common transport settings for each individual
                         channel of an element */
  HANDLE_FDK_BITSTREAM hBs;

  MP4_ELEMENT_ID
  elementID;     /* Element ID set during initialization. Can be used for
                    concealment */
  int nChannels; /* Number of elements output channels (=2 in case of PS) */

  UCHAR frameErrorFlag[(1) + 1]; /* Frame error status (for every slot in the
                                    delay line). Will be copied into header at
                                    the very beginning of decodeElement()
                                    routine. */

  UCHAR useFrameSlot; /* Index which defines which slot will be decoded/filled
                         next (used with additional delay) */
  UCHAR useHeaderSlot[(1) + 1]; /* Index array that provides the link between
                                   header and frame data (important when
                                   processing with additional delay). */
} SBR_DECODER_ELEMENT;

struct SBR_DECODER_INSTANCE {
  SBR_DECODER_ELEMENT *pSbrElement[(8)];
  SBR_HEADER_DATA sbrHeader[(
      8)][(1) + 1]; /* Sbr header for each individual channel of an element */

  HANDLE_FDK_QMF_DOMAIN pQmfDomain;

  HANDLE_PS_DEC hParametricStereoDec;

  /* Global parameters */
  AUDIO_OBJECT_TYPE coreCodec; /* AOT of core codec */
  int numSbrElements;
  int numSbrChannels;
  INT sampleRateIn;  /* SBR decoder input sampling rate; might be different than
                        the transposer input sampling rate. */
  INT sampleRateOut; /* Sampling rate of the SBR decoder output audio samples.
                      */
  USHORT codecFrameSize;
  UCHAR synDownsampleFac;
  INT downscaleFactor;
  UCHAR numDelayFrames; /* The current number of additional delay frames used
                           for processing. */
  UCHAR harmonicSBR;
  UCHAR
  numFlushedFrames; /* The variable counts the number of frames which are
                       flushed consecutively. */

  UINT flags;

  INT sbrInDataHeadroom; /* Headroom of the SBR input time signal to prevent
                            clipping */
};

H_ALLOC_MEM(Ram_SbrDecElement, SBR_DECODER_ELEMENT)
H_ALLOC_MEM(Ram_SbrDecChannel, SBR_CHANNEL)
H_ALLOC_MEM(Ram_SbrDecoder, struct SBR_DECODER_INSTANCE)

H_ALLOC_MEM(Ram_sbr_QmfStatesSynthesis, FIXP_QSS)
H_ALLOC_MEM(Ram_sbr_OverlapBuffer, FIXP_DBL)

H_ALLOC_MEM(Ram_sbr_HBEOverlapBuffer, FIXP_DBL)

H_ALLOC_MEM(Ram_ps_dec, PS_DEC)

#endif /* SBR_RAM_H */