/* -----------------------------------------------------------------------------
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Software License for The Fraunhofer FDK AAC Codec Library for Android
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© Copyright 1995 - 2018 Fraunhofer-Gesellschaft zur Förderung der angewandten
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Forschung e.V. All rights reserved.
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1. INTRODUCTION
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The Fraunhofer FDK AAC Codec Library for Android ("FDK AAC Codec") is software
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that implements the MPEG Advanced Audio Coding ("AAC") encoding and decoding
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scheme for digital audio. This FDK AAC Codec software is intended to be used on
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a wide variety of Android devices.
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AAC's HE-AAC and HE-AAC v2 versions are regarded as today's most efficient
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general perceptual audio codecs. AAC-ELD is considered the best-performing
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full-bandwidth communications codec by independent studies and is widely
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deployed. AAC has been standardized by ISO and IEC as part of the MPEG
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specifications.
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Patent licenses for necessary patent claims for the FDK AAC Codec (including
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those of Fraunhofer) may be obtained through Via Licensing
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(www.vialicensing.com) or through the respective patent owners individually for
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the purpose of encoding or decoding bit streams in products that are compliant
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with the ISO/IEC MPEG audio standards. Please note that most manufacturers of
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Android devices already license these patent claims through Via Licensing or
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directly from the patent owners, and therefore FDK AAC Codec software may
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already be covered under those patent licenses when it is used for those
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licensed purposes only.
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Commercially-licensed AAC software libraries, including floating-point versions
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with enhanced sound quality, are also available from Fraunhofer. Users are
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encouraged to check the Fraunhofer website for additional applications
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information and documentation.
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2. COPYRIGHT LICENSE
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Redistribution and use in source and binary forms, with or without modification,
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are permitted without payment of copyright license fees provided that you
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satisfy the following conditions:
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You must retain the complete text of this software license in redistributions of
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the FDK AAC Codec or your modifications thereto in source code form.
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You must retain the complete text of this software license in the documentation
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and/or other materials provided with redistributions of the FDK AAC Codec or
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your modifications thereto in binary form. You must make available free of
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charge copies of the complete source code of the FDK AAC Codec and your
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modifications thereto to recipients of copies in binary form.
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The name of Fraunhofer may not be used to endorse or promote products derived
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from this library without prior written permission.
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You may not charge copyright license fees for anyone to use, copy or distribute
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the FDK AAC Codec software or your modifications thereto.
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Your modified versions of the FDK AAC Codec must carry prominent notices stating
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that you changed the software and the date of any change. For modified versions
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of the FDK AAC Codec, the term "Fraunhofer FDK AAC Codec Library for Android"
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must be replaced by the term "Third-Party Modified Version of the Fraunhofer FDK
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AAC Codec Library for Android."
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3. NO PATENT LICENSE
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NO EXPRESS OR IMPLIED LICENSES TO ANY PATENT CLAIMS, including without
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limitation the patents of Fraunhofer, ARE GRANTED BY THIS SOFTWARE LICENSE.
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Fraunhofer provides no warranty of patent non-infringement with respect to this
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software.
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You may use this FDK AAC Codec software or modifications thereto only for
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purposes that are authorized by appropriate patent licenses.
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4. DISCLAIMER
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This FDK AAC Codec software is provided by Fraunhofer on behalf of the copyright
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holders and contributors "AS IS" and WITHOUT ANY EXPRESS OR IMPLIED WARRANTIES,
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including but not limited to the implied warranties of merchantability and
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fitness for a particular purpose. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
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CONTRIBUTORS BE LIABLE for any direct, indirect, incidental, special, exemplary,
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or consequential damages, including but not limited to procurement of substitute
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goods or services; loss of use, data, or profits, or business interruption,
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however caused and on any theory of liability, whether in contract, strict
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liability, or tort (including negligence), arising in any way out of the use of
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this software, even if advised of the possibility of such damage.
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5. CONTACT INFORMATION
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Fraunhofer Institute for Integrated Circuits IIS
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Attention: Audio and Multimedia Departments - FDK AAC LL
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Am Wolfsmantel 33
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91058 Erlangen, Germany
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www.iis.fraunhofer.de/amm
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amm-info@iis.fraunhofer.de
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----------------------------------------------------------------------------- */
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/******************* MPEG transport format decoder library *********************
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Author(s): Josef Hoepfl
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Description: ADTS interface
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*******************************************************************************/
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#ifndef TPDEC_ADTS_H
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#define TPDEC_ADTS_H
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#include "tpdec_lib.h"
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#define ADTS_SYNCWORD (0xfff)
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#define ADTS_SYNCLENGTH (12) /* in bits */
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#define ADTS_HEADERLENGTH (56) /* minimum header size in bits */
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#define ADTS_FIXED_HEADERLENGTH (28) /* in bits */
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#define ADTS_VARIABLE_HEADERLENGTH (ADTS_HEADERLENGTH - ADTS_FIXED_HEADERLENGTH)
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#ifdef CHECK_TWO_SYNCS
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#define ADTS_MIN_TP_BUF_SIZE (8191 + 2)
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#else
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#define ADTS_MIN_TP_BUF_SIZE (8191)
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#endif
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#include "FDK_crc.h"
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typedef struct {
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/* ADTS header fields */
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UCHAR mpeg_id;
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UCHAR layer;
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UCHAR protection_absent;
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UCHAR profile;
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UCHAR sample_freq_index;
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UCHAR private_bit;
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UCHAR channel_config;
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UCHAR original;
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UCHAR home;
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UCHAR copyright_id;
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UCHAR copyright_start;
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USHORT frame_length;
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USHORT adts_fullness;
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UCHAR num_raw_blocks;
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UCHAR num_pce_bits;
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} STRUCT_ADTS_BS;
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struct STRUCT_ADTS {
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STRUCT_ADTS_BS bs;
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UCHAR decoderCanDoMpeg4;
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UCHAR BufferFullnesStartFlag;
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FDK_CRCINFO crcInfo; /* CRC state info */
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USHORT crcReadValue; /* CRC value read from bitstream data */
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USHORT rawDataBlockDist[4]; /* distance between each raw data block. Not the
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same as found in the bitstream */
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};
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typedef struct STRUCT_ADTS *HANDLE_ADTS;
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/*!
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\brief Initialize ADTS CRC
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The function initialzes the crc buffer and the crc lookup table.
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\return none
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*/
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void adtsRead_CrcInit(HANDLE_ADTS pAdts);
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/**
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* \brief Starts CRC region with a maximum number of bits
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* If mBits is positive zero padding will be used for CRC calculation, if
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* there are less than mBits bits available. If mBits is negative no zero
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* padding is done. If mBits is zero the memory for the buffer is
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* allocated dynamically, the number of bits is not limited.
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*
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* \param pAdts ADTS data handle
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* \param hBs bitstream handle, on which the CRC region referes to
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* \param mBits max number of bits in crc region to be considered
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*
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* \return ID for the created region, -1 in case of an error
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*/
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int adtsRead_CrcStartReg(HANDLE_ADTS pAdts, HANDLE_FDK_BITSTREAM hBs,
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int mBits);
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/**
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* \brief Ends CRC region identified by reg
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*
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* \param pAdts ADTS data handle
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* \param hBs bitstream handle, on which the CRC region referes to
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* \param reg CRC regions ID returned by adtsRead_CrcStartReg()
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*
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* \return none
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*/
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void adtsRead_CrcEndReg(HANDLE_ADTS pAdts, HANDLE_FDK_BITSTREAM hBs, int reg);
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/**
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* \brief Check CRC
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*
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* Checks if the currently calculated CRC matches the CRC field read from the
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* bitstream Deletes all CRC regions.
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*
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* \param pAdts ADTS data handle
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*
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* \return Returns 0 if they are identical otherwise 1
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*/
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TRANSPORTDEC_ERROR adtsRead_CrcCheck(HANDLE_ADTS pAdts);
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/**
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* \brief Check if we have a valid ADTS frame at the current bitbuffer position
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*
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* This function assumes enough bits in buffer for the current frame.
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* It reads out the header bits to prepare the bitbuffer for the decode loop.
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* In case the header bits show an invalid bitstream/frame, the whole frame is
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* skipped.
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*
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* \param pAdts ADTS data handle which is filled with parsed ADTS header data
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* \param bs handle of bitstream from whom the ADTS header is read
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*
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* \return error status
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*/
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TRANSPORTDEC_ERROR adtsRead_DecodeHeader(HANDLE_ADTS pAdts,
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CSAudioSpecificConfig *pAsc,
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HANDLE_FDK_BITSTREAM bs,
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const INT ignoreBufferFullness);
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/**
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* \brief Get the raw data block length of the given block number.
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*
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* \param pAdts ADTS data handle
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* \param blockNum current raw data block index
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* \param pLength pointer to an INT where the length of the given raw data block
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* is stored into the returned value might be -1, in which case the raw data
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* block length is unknown.
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*
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* \return error status
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*/
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int adtsRead_GetRawDataBlockLength(HANDLE_ADTS pAdts, INT blockNum);
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#endif /* TPDEC_ADTS_H */
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