xref: /external/aac/libAACdec/src/rvlc_info.h

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

� Copyright  1995 - 2013 Fraunhofer-Gesellschaft zur F�rderung 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
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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
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"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."

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NO EXPRESS OR IMPLIED LICENSES TO ANY PATENT CLAIMS, including without limitation the patents of Fraunhofer,
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respect to this software.

You may use this FDK AAC Codec software or modifications thereto only for purposes that are authorized
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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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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  Defines structures for RVLC
  \author Robert Weidner
*/
#ifndef RVLC_INFO_H
#define RVLC_INFO_H



#define FWD                           0     /* bitstream decoding direction forward (RVL coded part) */
#define BWD                           1     /* bitstream decoding direction backward (RVL coded part) */

#define MAX_RVL                       7     /* positive RVLC escape */
#define MIN_RVL                      -7     /* negative RVLC escape */
#define MAX_ALLOWED_DPCM_INDEX       14     /* the maximum allowed index of a decoded dpcm value (offset 'TABLE_OFFSET' incl --> must be subtracted) */
#define TABLE_OFFSET                  7     /* dpcm offset of valid output values of rvl table decoding, the rvl table ouly returns positive values, therefore the offset */
#define MAX_LEN_RVLC_CODE_WORD        9     /* max length of a RVL codeword in bits */
#define MAX_LEN_RVLC_ESCAPE_WORD     20     /* max length of huffman coded RVLC escape word in bits */

#define DPCM_NOISE_NRG_BITS           9
#define SF_OFFSET                   100     /* offset for correcting scf value */

#define CONCEAL_MAX_INIT           1311     /* arbitrary value */
#define CONCEAL_MIN_INIT          -1311     /* arbitrary value */

#define RVLC_MAX_SFB              ((8) * (16))

/* sideinfo of RVLC */
typedef struct
{
  /* ------- ESC 1 Data: --------- */     /* order of RVLC-bitstream components in bitstream (RVLC-initialization), every component appears only once in bitstream */
  INT        sf_concealment;              /* 1          */
  INT        rev_global_gain;             /* 2          */
  SHORT      length_of_rvlc_sf;           /* 3          */  /* original value, gets modified (subtract 9) in case of noise (PNS); is kept for later use */
  INT        dpcm_noise_nrg;              /* 4 optional */
  INT        sf_escapes_present;          /* 5          */
  SHORT      length_of_rvlc_escapes;      /* 6 optional */
  INT        dpcm_noise_last_position;    /* 7 optional */

  INT        dpcm_is_last_position;

  SHORT      length_of_rvlc_sf_fwd;       /* length_of_rvlc_sf used for forward decoding */
  SHORT      length_of_rvlc_sf_bwd;       /* length_of_rvlc_sf used for backward decoding */

  /* for RVL-Codeword decoder to distinguish between fwd and bwd decoding */
  SHORT     *pRvlBitCnt_RVL;
  USHORT    *pBitstrIndxRvl_RVL;

  UCHAR      numWindowGroups;
  UCHAR      maxSfbTransmitted;
  UCHAR      first_noise_group;
  UCHAR      first_noise_band;
  UCHAR      direction;

  /* bitstream indices */
  USHORT     bitstreamIndexRvlFwd;        /* base address of RVL-coded-scalefactor data (ESC 2) for forward  decoding */
  USHORT     bitstreamIndexRvlBwd;        /* base address of RVL-coded-scalefactor data (ESC 2) for backward decoding */
  USHORT     bitstreamIndexEsc;           /* base address where RVLC-escapes start (ESC 2) */

  /* decoding trees */
  const UINT *pHuffTreeRvlCodewds;
  const UINT *pHuffTreeRvlcEscape;

  /* escape counters */
  UCHAR      numDecodedEscapeWordsFwd;    /* when decoding RVL-codes forward  */
  UCHAR      numDecodedEscapeWordsBwd;    /* when decoding RVL-codes backward */
  UCHAR      numDecodedEscapeWordsEsc;    /* when decoding the escape-Words */

  SCHAR      noise_used;
  SCHAR      intensity_used;
  SCHAR      sf_used;

  SHORT      firstScf;
  SHORT      lastScf;
  SHORT      firstNrg;
  SHORT      lastNrg;
  SHORT      firstIs;
  SHORT      lastIs;

  /* ------ RVLC error detection ------ */
  UINT       errorLogRvlc;                /* store RVLC errors  */
  SHORT      conceal_min;                 /* is set at backward decoding  */
  SHORT      conceal_max;                 /* is set at forward  decoding  */
  SHORT      conceal_min_esc;             /* is set at backward decoding  */
  SHORT      conceal_max_esc;             /* is set at forward  decoding  */
} CErRvlcInfo;

typedef CErRvlcInfo RVLC_INFO; /* temp */



#endif /* RVLC_INFO_H */