xref: /external/aac/libMpegTPDec/src/tpdec_drm.cpp

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

� Copyright  1995 - 2015 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.

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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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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
----------------------------------------------------------------------------------------------------------- */

/*****************************  MPEG-4 AAC Decoder  **************************

   Author(s):   Christian Griebel
   Description: DRM transport stuff

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

#include "tpdec_drm.h"


#include "FDK_bitstream.h"



void drmRead_CrcInit(HANDLE_DRM pDrm)      /*!< pointer to drm crc info stucture */
{
  FDK_ASSERT(pDrm != NULL);

  FDKcrcInit(&pDrm->crcInfo, 0x001d, 0xFFFF, 8);
}

int drmRead_CrcStartReg(
                     HANDLE_DRM pDrm,            /*!< pointer to drm stucture */
                     HANDLE_FDK_BITSTREAM hBs,   /*!< handle to current bit buffer structure */
                     int mBits                   /*!< number of bits in crc region */
                   )
{
  FDK_ASSERT(pDrm != NULL);

  FDKcrcReset(&pDrm->crcInfo);

  pDrm->crcReadValue = FDKreadBits(hBs, 8);

  return ( FDKcrcStartReg(&pDrm->crcInfo, hBs, mBits) );

}

void drmRead_CrcEndReg(
                    HANDLE_DRM pDrm,             /*!< pointer to drm crc info stucture */
                    HANDLE_FDK_BITSTREAM hBs,    /*!< handle to current bit buffer structure */
                    int reg                      /*!< crc region */
                  )
{
  FDK_ASSERT(pDrm != NULL);

  FDKcrcEndReg(&pDrm->crcInfo, hBs, reg);
}

TRANSPORTDEC_ERROR drmRead_CrcCheck( HANDLE_DRM pDrm )
{
  TRANSPORTDEC_ERROR ErrorStatus = TRANSPORTDEC_OK;
  USHORT crc;

  crc = FDKcrcGetCRC(&pDrm->crcInfo) ^ 0xFF;
  if (crc != pDrm->crcReadValue)
  {
    return (TRANSPORTDEC_CRC_ERROR);
  }

  return (ErrorStatus);
}