sbr_ram.cpp - Android社区 - https://www.androidos.net.cn/

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

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
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"Third-Party Modified Version of the Fraunhofer FDK AAC Codec Library for Android."

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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
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or business interruption, 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
amm-info@iis.fraunhofer.de
----------------------------------------------------------------------------------------------------------- */

/*!
  \file
  \brief Memory layout

This module declares all static and dynamic memory spaces
*/

#include "sbr_ram.h"

#define WORKBUFFER1_TAG 0
#define WORKBUFFER2_TAG 1

/*!
  \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 
 Dimension: (8) */
C_ALLOC_MEM2(Ram_SbrDecElement, SBR_DECODER_ELEMENT, 1, (8))
/*! SBR Decoder individual channel data 
 Dimension: (8) */
C_ALLOC_MEM2(Ram_SbrDecChannel, SBR_CHANNEL, 1, (8)+1)

/*! Filter states for QMF-synthesis. 
 Dimension: #(8) * (#QMF_FILTER_STATE_SYN_SIZE-#(64)) */
C_AALLOC_MEM2_L(Ram_sbr_QmfStatesSynthesis, FIXP_QSS, (640)-(64), (8)+1, SECT_DATA_L1)

/*! Delayed spectral data needed for the dynamic framing of SBR.
  For mp3PRO, 1/3 of a frame is buffered (#(6) 6) */
C_AALLOC_MEM2(Ram_sbr_OverlapBuffer, FIXP_DBL, 2 * (6) * (64), (8)+1)

/*! Static Data of PS */

C_ALLOC_MEM(Ram_ps_dec, PS_DEC, 1)

/* @} */

/*!
  \name DynamicSbrData

Dynamic memory areas, might be reused in other algorithm sections,
 e.g. the core decoder
 
 Depending on the mode set by DONT_USE_CORE_WORKBUFFER, workbuffers are
 defined additionally to the CoreWorkbuffer.
 
 The size of WorkBuffers is ((1024)/(32))*(64) = 2048.
 
 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.
 
 WorkBuffer1 is reused in the AAC core (-> aacdecoder.cpp, aac_ram.cpp)

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

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

SLOTBASED_PS

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

</pre>

*/
/* @{ */
C_ALLOC_MEM_OVERLAY(Ram_SbrDecWorkBuffer1, FIXP_DBL, ((1024)/(32))*(64), SECT_DATA_L1, WORKBUFFER1_TAG)
C_ALLOC_MEM_OVERLAY(Ram_SbrDecWorkBuffer2, FIXP_DBL, ((1024)/(32))*(64), SECT_DATA_L2, WORKBUFFER2_TAG)

/* @} */

C++程序 | 195行 | 7.76 KB

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