libSBRdec/src/sbr_ram.cpp

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

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 1.    INTRODUCTION
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----------------------------------------------------------------------------- */

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

   Author(s):

   Description:

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

/*!
  \file
  \brief Memory layout

  This module declares all static and dynamic memory spaces
*/

#include "sbr_ram.h"

#define WORKBUFFER1_TAG 2
#define WORKBUFFER2_TAG 3

/*!
  \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>

*/