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+/* -----------------------------------------------------------------------------
+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
+and/or other materials provided with redistributions of the FDK AAC Codec or
+your modifications thereto in binary form. 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.
+
+The name of Fraunhofer may not be used to endorse or promote products derived
+from this library without prior written permission.
+
+You may not charge copyright license fees for anyone to use, copy or distribute
+the FDK AAC Codec software or your modifications thereto.
+
+Your modified versions of the FDK AAC Codec must carry prominent notices stating
+that you changed the software and the date of any change. For modified versions
+of the FDK AAC Codec, the term "Fraunhofer FDK AAC Codec Library for Android"
+must be replaced by the term "Third-Party Modified Version of the Fraunhofer FDK
+AAC Codec Library for Android."
+
+3.    NO PATENT LICENSE
+
+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
+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 of merchantability and
+fitness for a particular purpose. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR
+CONTRIBUTORS BE LIABLE for any direct, indirect, incidental, special, exemplary,
+or consequential damages, including but not limited to procurement of substitute
+goods or services; loss of use, data, or profits, or business interruption,
+however caused and on any theory of liability, whether in contract, strict
+liability, or tort (including negligence), arising in any way out of the use of
+this software, even if advised of the possibility of such damage.
+
+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: ADTS interface
+
+*******************************************************************************/
+
+#ifndef TPDEC_ADTS_H
+#define TPDEC_ADTS_H
+
+#include "tpdec_lib.h"
+
+#define ADTS_SYNCWORD (0xfff)
+#define ADTS_SYNCLENGTH (12)         /* in bits */
+#define ADTS_HEADERLENGTH (56)       /* minimum header size in bits */
+#define ADTS_FIXED_HEADERLENGTH (28) /* in bits */
+#define ADTS_VARIABLE_HEADERLENGTH (ADTS_HEADERLENGTH - ADTS_FIXED_HEADERLENGTH)
+
+#ifdef CHECK_TWO_SYNCS
+#define ADTS_MIN_TP_BUF_SIZE (8191 + 2)
+#else
+#define ADTS_MIN_TP_BUF_SIZE (8191)
+#endif
+
+#include "FDK_crc.h"
+
+typedef struct {
+  /* ADTS header fields */
+  UCHAR mpeg_id;
+  UCHAR layer;
+  UCHAR protection_absent;
+  UCHAR profile;
+  UCHAR sample_freq_index;
+  UCHAR private_bit;
+  UCHAR channel_config;
+  UCHAR original;
+  UCHAR home;
+  UCHAR copyright_id;
+  UCHAR copyright_start;
+  USHORT frame_length;
+  USHORT adts_fullness;
+  UCHAR num_raw_blocks;
+  UCHAR num_pce_bits;
+} STRUCT_ADTS_BS;
+
+struct STRUCT_ADTS {
+  STRUCT_ADTS_BS bs;
+
+  UCHAR decoderCanDoMpeg4;
+  UCHAR BufferFullnesStartFlag;
+
+  FDK_CRCINFO crcInfo;        /* CRC state info */
+  USHORT crcReadValue;        /* CRC value read from bitstream data */
+  USHORT rawDataBlockDist[4]; /* distance between each raw data block. Not the
+                                 same as found in the bitstream */
+};
+
+typedef struct STRUCT_ADTS *HANDLE_ADTS;
+
+/*!
+  \brief Initialize ADTS CRC
+
+  The function initialzes the crc buffer and the crc lookup table.
+
+  \return  none
+*/
+void adtsRead_CrcInit(HANDLE_ADTS pAdts);
+
+/**
+ * \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 pAdts ADTS 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 adtsRead_CrcStartReg(HANDLE_ADTS pAdts, HANDLE_FDK_BITSTREAM hBs,
+                         int mBits);
+
+/**
+ * \brief Ends CRC region identified by reg
+ *
+ * \param pAdts ADTS data handle
+ * \param hBs bitstream handle, on which the CRC region referes to
+ * \param reg CRC regions ID returned by adtsRead_CrcStartReg()
+ *
+ * \return  none
+ */
+void adtsRead_CrcEndReg(HANDLE_ADTS pAdts, 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 pAdts ADTS data handle
+ *
+ * \return Returns 0 if they are identical otherwise 1
+ */
+TRANSPORTDEC_ERROR adtsRead_CrcCheck(HANDLE_ADTS pAdts);
+
+/**
+ * \brief Check if we have a valid ADTS 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 pAdts ADTS data handle which is filled with parsed ADTS header data
+ * \param bs handle of bitstream from whom the ADTS header is read
+ *
+ * \return  error status
+ */
+TRANSPORTDEC_ERROR adtsRead_DecodeHeader(HANDLE_ADTS pAdts,
+                                         CSAudioSpecificConfig *pAsc,
+                                         HANDLE_FDK_BITSTREAM bs,
+                                         const INT ignoreBufferFullness);
+
+/**
+ * \brief Get the raw data block length of the given block number.
+ *
+ * \param pAdts ADTS data handle
+ * \param blockNum current raw data block index
+ * \param pLength pointer to an INT where the length of the given raw data block
+ * is stored into the returned value might be -1, in which case the raw data
+ * block length is unknown.
+ *
+ * \return  error status
+ */
+int adtsRead_GetRawDataBlockLength(HANDLE_ADTS pAdts, INT blockNum);
+
+#endif /* TPDEC_ADTS_H */