xref: /aosp_15_r20/external/aac/libSBRdec/src/sbr_ram.cpp (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
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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
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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.

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This FDK AAC Codec software is provided by Fraunhofer on behalf of the copyright
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Am Wolfsmantel 33
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www.iis.fraunhofer.de/amm
[email protected]
----------------------------------------------------------------------------- */

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

   Author(s):

   Description:

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

/*!
  \file
  \brief Memory layout

  This module declares all static and dynamic memory spaces
*/

#include "sbr_ram.h"

/*!
  \name StaticSbrData

  Static memory areas, must not be overwritten in other sections of the decoder
*/
/* @{ */

/*! SBR Decoder main structure */
C_ALLOC_MEM(Ram_SbrDecoder, struct SBR_DECODER_INSTANCE, 1)
/*! SBR Decoder element data  <br>
  Dimension: (8) */
C_ALLOC_MEM2(Ram_SbrDecElement, SBR_DECODER_ELEMENT, 1, (8))
/*! SBR Decoder individual channel data  <br>
  Dimension: (8) */
C_ALLOC_MEM2(Ram_SbrDecChannel, SBR_CHANNEL, 1, (8) + 1)

/*! Static Data of PS */

C_ALLOC_MEM(Ram_ps_dec, struct PS_DEC, 1)

/* @} */

/*!
  \name DynamicSbrData

  Dynamic memory areas, might be reused in other algorithm sections,
  e.g. the core decoder
  <br>
  Depending on the mode set by DONT_USE_CORE_WORKBUFFER, workbuffers are
  defined additionally to the CoreWorkbuffer.
  <br>
  The size of WorkBuffers is ((1024) / (32) * (4) / 2)*(64) = 2048.
  <br>
  WorkBuffer2 is a pointer to the CoreWorkBuffer wich is reused here in the SBR
  part. In case of DONT_USE_CORE_WORKBUFFER, the CoreWorkbuffer is not used and
  the according Workbuffer2 is defined locally in this file. <br> WorkBuffer1 is
  reused in the AAC core (-> aacdecoder.cpp, aac_ram.cpp) <br>

  Use of WorkBuffers:
  <pre>

    -------------------------------------------------------------
    AAC core:

      CoreWorkbuffer: spectral coefficients
      WorkBuffer1:    CAacDecoderChannelInfo, CAacDecoderDynamicData

    -------------------------------------------------------------
    SBR part:
      ----------------------------------------------
      Low Power Mode (useLP=1 or LOW_POWER_SBR_ONLY), see assignLcTimeSlots()

        SLOT_BASED_PROTOTYPE_SYN_FILTER

        WorkBuffer1                                WorkBuffer2(=CoreWorkbuffer)
         ________________                           ________________
        | RealLeft       |                         | RealRight      |
        |________________|                         |________________|

      ----------------------------------------------
      High Quality Mode (!LOW_POWER_SBR_ONLY and useLP=0), see
  assignHqTimeSlots()

         SLOTBASED_PS

         WorkBuffer1                                WorkBuffer2(=CoreWorkbuffer)
         ________________                           ________________
        | Real/Imag      |  interleaved            | Real/Imag      |
  interleaved
        |________________|  first half actual ch   |________________|  second
  half actual ch

    -------------------------------------------------------------

  </pre>

*/