fdk-aac/libSYS/include/syslib_channelMapDescr.h

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

© Copyright  1995 - 2018 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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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
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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
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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
----------------------------------------------------------------------------- */

/************************* System integration library **************************

   Author(s):   Thomas Dietzen

   Description:

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

/** \file   syslib_channelMapDescr.h
 *  \brief  Function and structure declarations for the channel map descriptor implementation.
 */

#ifndef SYSLIB_CHANNELMAPDESCR_H
#define SYSLIB_CHANNELMAPDESCR_H

#include "machine_type.h"

/**
 * \brief  Contains information needed for a single channel map.
 */
typedef struct {
  const UCHAR*
      pChannelMap; /*!< Actual channel mapping for one single configuration. */
  UCHAR numChannels; /*!< The number of channels for the channel map which is
                        the maximum used channel index+1. */
} CHANNEL_MAP_INFO;

/**
 * \brief   This is the main data struct. It contains the mapping for all
 * channel configurations such as administration information.
 *
 * CAUTION: Do not access this structure directly from a algorithm specific
 * library. Always use one of the API access functions below!
 */
typedef struct {
  const CHANNEL_MAP_INFO* pMapInfoTab; /*!< Table of channel maps. */
  UINT mapInfoTabLen; /*!< Length of the channel map table array. */
  UINT fPassThrough;  /*!< Flag that defines whether the specified mapping shall
                         be applied  (value: 0) or the input just gets passed
                         through (MPEG mapping). */
} FDK_channelMapDescr;

#ifdef __cplusplus
extern "C" {
#endif

/**
 * \brief  Initialize a given channel map descriptor.
 *
 * \param  pMapDescr      Pointer to a channel map descriptor to be initialized.
 * \param  pMapInfoTab    Table of channel maps to initizalize the descriptor
 with.
 *                        If a NULL pointer is given a default table for
 WAV-like mapping will be used.
 * \param  mapInfoTabLen  Length of the channel map table array (pMapInfoTab).
 If a zero length is given a default table for WAV-like mapping will be used.
 * \param  fPassThrough   If the flag is set the reordering (given by
 pMapInfoTab) will be bypassed.
 */
void FDK_chMapDescr_init(FDK_channelMapDescr* const pMapDescr,
                         const CHANNEL_MAP_INFO* const pMapInfoTab,
                         const UINT mapInfoTabLen, const UINT fPassThrough);

/**
 * \brief  Change the channel reordering state of a given channel map
 * descriptor.
 *
 * \param  pMapDescr     Pointer to a (initialized) channel map descriptor.
 * \param  fPassThrough  If the flag is set the reordering (given by
 * pMapInfoTab) will be bypassed.
 * \return               Value unequal to zero if set operation was not
 * successful. And zero on success.
 */
int FDK_chMapDescr_setPassThrough(FDK_channelMapDescr* const pMapDescr,
                                  UINT fPassThrough);

/**
 * \brief  Get the mapping value for a specific channel and map index.
 *
 * \param  pMapDescr  Pointer to channel map descriptor.
 * \param  chIdx      Channel index.
 * \param  mapIdx     Mapping index (corresponding to the channel configuration
 * index).
 * \return            Mapping value.
 */
UCHAR FDK_chMapDescr_getMapValue(const FDK_channelMapDescr* const pMapDescr,
                                 const UCHAR chIdx, const UINT mapIdx);

/**
 * \brief  Evaluate whether channel map descriptor is reasonable or not.
 *
 * \param  pMapDescr Pointer to channel map descriptor.
 * \return           Value unequal to zero if descriptor is valid, otherwise
 * zero.
 */
int FDK_chMapDescr_isValid(const FDK_channelMapDescr* const pMapDescr);

#ifdef __cplusplus
}
#endif

#endif /* !defined(SYSLIB_CHANNELMAPDESCR_H) */