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

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

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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.

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5.    CONTACT INFORMATION

Fraunhofer Institute for Integrated Circuits IIS
Attention: Audio and Multimedia Departments - FDK AAC LL
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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);
}

C++程序 | 147行 | 6.11 KB

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