tpdec_drm.h - 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
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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.

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

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ARE GRANTED BY THIS SOFTWARE LICENSE. Fraunhofer provides no warranty of patent non-infringement with
respect to this software.

You may use this FDK AAC Codec software or modifications thereto only for purposes that are authorized
by appropriate patent licenses.

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):   Josef Hoepfl
   Description: DRM interface

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

#ifndef TPDEC_DRM_H
#define TPDEC_DRM_H

#include "tpdec_lib.h"

#include "FDK_crc.h"

typedef struct {

FDK_CRCINFO crcInfo;             /* CRC state info */
  USHORT      crcReadValue;        /* CRC value read from bitstream data */

} STRUCT_DRM;

typedef STRUCT_DRM *HANDLE_DRM;

/*!
  \brief Initialize DRM CRC

The function initialzes the crc buffer and the crc lookup table.

\return  none
*/
void drmRead_CrcInit( HANDLE_DRM pDrm );

/**
 * \brief Starts CRC region with a maximum number of bits
 *        If mBits is positive zero padding will be used for CRC calculation, if there
 *        are less than mBits bits available.
 *        If mBits is negative no zero padding is done.
 *        If mBits is zero the memory for the buffer is allocated dynamically, the
 *        number of bits is not limited.
 *
 * \param pDrm DRM data handle
 * \param hBs bitstream handle, on which the CRC region referes to
 * \param mBits max number of bits in crc region to be considered
 *
 * \return  ID for the created region, -1 in case of an error
 */
int drmRead_CrcStartReg(
        HANDLE_DRM pDrm,
        HANDLE_FDK_BITSTREAM hBs,
        int mBits
        );

/**
 * \brief Ends CRC region identified by reg
 *
 * \param pDrm DRM data handle
 * \param hBs bitstream handle, on which the CRC region referes to
 * \param reg CRC regions ID returned by drmRead_CrcStartReg()
 *
 * \return  none
 */
void drmRead_CrcEndReg(
        HANDLE_DRM pDrm,
        HANDLE_FDK_BITSTREAM hBs,
        int reg
        );

/**
 * \brief Check CRC
 *
 * Checks if the currently calculated CRC matches the CRC field read from the bitstream
 * Deletes all CRC regions.
 *
 * \param pDrm DRM data handle
 *
 * \return Returns 0 if they are identical otherwise 1
 */
TRANSPORTDEC_ERROR drmRead_CrcCheck( HANDLE_DRM pDrm );

/**
 * \brief Check if we have a valid DRM frame at the current bitbuffer position
 *
 * This function assumes enough bits in buffer for the current frame.
 * It reads out the header bits to prepare the bitbuffer for the decode loop.
 * In case the header bits show an invalid bitstream/frame, the whole frame is skipped.
 *
 * \param pDrm DRM data handle which is filled with parsed DRM header data
 * \param bs handle of bitstream from whom the DRM header is read
 *
 * \return  error status
 */
TRANSPORTDEC_ERROR drmRead_DecodeHeader(
        HANDLE_DRM            pDrm,
        HANDLE_FDK_BITSTREAM  bs
        );

/**
 * \brief   Parse a Drm specific SDC audio config from a given bitstream handle.
 *
 * \param pAsc                         A pointer to an allocated CSAudioSpecificConfig struct.
 * \param hBs                          Bitstream handle.
 *
 * \return  Total element count including all SCE, CPE and LFE.
 */
TRANSPORTDEC_ERROR DrmRawSdcAudioConfig_Parse( CSAudioSpecificConfig *pAsc,
                                               HANDLE_FDK_BITSTREAM hBs );

#endif /* TPDEC_DRM_H */

C++程序 | 195行 | 7.63 KB

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