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+/***************************** MPEG-4 AAC Decoder **************************
+
+ (C) Copyright Fraunhofer IIS (2004)
+ All Rights Reserved
+
+ Please be advised that this software and/or program delivery is
+ Confidential Information of Fraunhofer and subject to and covered by the
+
+ Fraunhofer IIS Software Evaluation Agreement
+ between Google Inc. and Fraunhofer
+ effective and in full force since March 1, 2012.
+
+ You may use this software and/or program only under the terms and
+ conditions described in the above mentioned Fraunhofer IIS Software
+ Evaluation Agreement. Any other and/or further use requires a separate agreement.
+
+
+ $Id$
+ Author(s): Josef Hoepfl
+ Description: ADTS interface
+
+ This software and/or program is protected by copyright law and international
+ treaties. Any reproduction or distribution of this software and/or program,
+ or any portion of it, may result in severe civil and criminal penalties, and
+ will be prosecuted to the maximum extent possible under law.
+
+******************************************************************************/
+
+#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 */