fdk-aac/libMpegTPDec/src/tpdec_drm.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
(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
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NO EXPRESS OR IMPLIED LICENSES TO ANY PATENT CLAIMS, including without
limitation the patents of Fraunhofer, 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
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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,
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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 transport format decoder library *********************

   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.
 * \param cb                           A pointer to structure holding callback
 * information Note: A NULL pointer for cb can be used to signal a "Check Config
 * only functionality"
 * \param configMode                   Config modes: memory allocation mode or
 * config change detection mode
 * \param configChanged                Indicates a config change
 *
 * \return  Total element count including all SCE, CPE and LFE.
 */
TRANSPORTDEC_ERROR DrmRawSdcAudioConfig_Parse(CSAudioSpecificConfig *pAsc,
                                              HANDLE_FDK_BITSTREAM hBs,
                                              CSTpCallBacks *cb,
                                              const UCHAR configMode,
                                              const UCHAR configChanged);

#endif /* TPDEC_DRM_H */