path: root/libMpegTPDec/src/tpdec_lib.cpp

/* -----------------------------------------------------------------------------------------------------------
Software License for The Fraunhofer FDK AAC Codec Library for Android

� Copyright  1995 - 2013 Fraunhofer-Gesellschaft zur F�rderung 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
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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
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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, 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 Transport Decoder  ************************

   Author(s): Manuel Jander
   Description: MPEG Transport decoder

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

#include "tpdec_lib.h"

/* library version */
#include "version"


#include "tp_data.h"

#include "tpdec_adts.h"

#include "tpdec_adif.h"

#include "tpdec_latm.h"



#define MODULE_NAME "transportDec"

typedef union {
  STRUCT_ADTS adts;

  CAdifHeader adif;

  CLatmDemux latm;


} transportdec_parser_t;

struct TRANSPORTDEC
{
  TRANSPORT_TYPE transportFmt;     /*!< MPEG4 transportDec type. */

  CSTpCallBacks callbacks;         /*!< Struct holding callback and its data */

  FDK_BITSTREAM bitStream[2]; /* Bitstream reader */
  UCHAR *bsBuffer;                 /* Internal bitstreamd data buffer (unallocated in case of TT_MP4_RAWPACKETS) */

  transportdec_parser_t parser;    /* Format specific parser structs. */

  CSAudioSpecificConfig asc[(1*2)]; /* Audio specific config from the last config found. */
  UINT  globalFramePos;            /* Global transport frame reference bit position. */
  UINT  accessUnitAnchor[2];    /* Current access unit start bit position. */
  INT   auLength[2];            /* Length of current access unit. */
  INT   numberOfRawDataBlocks;     /* Current number of raw data blocks contained remaining from the current transport frame. */
  UINT  avgBitRate;                /* Average bit rate used for frame loss estimation. */
  UINT  lastValidBufferFullness;   /* Last valid buffer fullness value for frame loss estimation */
  INT   remainder;                 /* Reminder in division during lost access unit estimation. */
  INT   missingAccessUnits;        /* Estimated missing access units. */
  UINT  burstPeriod;               /* Data burst period in mili seconds. */
  UINT  holdOffFrames;             /* Amount of frames that were already hold off due to buffer fullness condition not being met. */
  UINT  flags;                     /* Flags. */
};

/* Flag bitmasks for "flags" member of struct TRANSPORTDEC */
#define TPDEC_SYNCOK                1
#define TPDEC_MINIMIZE_DELAY        2
#define TPDEC_IGNORE_BUFFERFULLNESS 4
#define TPDEC_EARLY_CONFIG          8
#define TPDEC_LOST_FRAMES_PENDING  16
#define TPDEC_CONFIG_FOUND         32

C_ALLOC_MEM(Ram_TransportDecoder, TRANSPORTDEC, 1)
C_ALLOC_MEM(Ram_TransportDecoderBuffer, UCHAR, TRANSPORTDEC_INBUF_SIZE)




HANDLE_TRANSPORTDEC transportDec_Open( const TRANSPORT_TYPE transportFmt, const UINT flags)
{
  HANDLE_TRANSPORTDEC hInput;

  hInput = GetRam_TransportDecoder(0);
  if ( hInput == NULL ) {
    return NULL;
  }

  /* Init transportDec struct. */
  hInput->transportFmt = transportFmt;

  switch (transportFmt) {

  case TT_MP4_ADIF:
    break;

  case TT_MP4_ADTS:
    if (flags & TP_FLAG_MPEG4)
      hInput->parser.adts.decoderCanDoMpeg4 = 1;
    else
      hInput->parser.adts.decoderCanDoMpeg4 = 0;
    adtsRead_CrcInit(&hInput->parser.adts);
    hInput->parser.adts.BufferFullnesStartFlag = 1;
    hInput->numberOfRawDataBlocks = 0;
    break;


  case TT_MP4_LATM_MCP0:
  case TT_MP4_LATM_MCP1:
  case TT_MP4_LOAS:
  case TT_MP4_RAW:
    break;

  default:
    FreeRam_TransportDecoder(&hInput);
    hInput = NULL;
    break;
  }

  if (hInput != NULL) {
    /* Create bitstream */
    if ( TT_IS_PACKET(transportFmt) ) {
      hInput->bsBuffer = NULL;
    } else {
      hInput->bsBuffer = GetRam_TransportDecoderBuffer(0);
      if (hInput->bsBuffer == NULL) {
          transportDec_Close( &hInput );
          return NULL;
      }
      FDKinitBitStream(&hInput->bitStream[0], hInput->bsBuffer, TRANSPORTDEC_INBUF_SIZE, 0, BS_READER);
    }

    hInput->burstPeriod = 0;
  }

  return hInput;
}

TRANSPORTDEC_ERROR transportDec_OutOfBandConfig(HANDLE_TRANSPORTDEC hTp, UCHAR *conf, const UINT length, UINT layer )
{
  TRANSPORTDEC_ERROR     err        = TRANSPORTDEC_OK;

  FDK_BITSTREAM bs;
  HANDLE_FDK_BITSTREAM  hBs        = &bs;

  FDKinitBitStream(hBs, conf, 0x10000000, length<<3, BS_READER);

  int fConfigFound = 0;

  /* config transport decoder */
  switch (hTp->transportFmt) {
    case TT_MP4_LATM_MCP0:
    case TT_MP4_LATM_MCP1:
    case TT_MP4_LOAS:
      {
        if (layer != 0) {
          return TRANSPORTDEC_INVALID_PARAMETER;
        }
        CLatmDemux *pLatmDemux = &hTp->parser.latm;
        err = CLatmDemux_ReadStreamMuxConfig(hBs, pLatmDemux, &hTp->callbacks, hTp->asc, &fConfigFound);
        if (err != TRANSPORTDEC_OK) {
          return err;
        }
      }
      break;
    default:
      fConfigFound = 1;
      err = AudioSpecificConfig_Parse(&hTp->asc[layer], hBs, 1, &hTp->callbacks);
      if (err == TRANSPORTDEC_OK) {
        int errC;

        errC = hTp->callbacks.cbUpdateConfig(hTp->callbacks.cbUpdateConfigData, &hTp->asc[layer]);
        if (errC != 0) {
          err = TRANSPORTDEC_PARSE_ERROR;
        }
      }
      break;
  }

  if (err == TRANSPORTDEC_OK && fConfigFound) {
    hTp->flags |= TPDEC_CONFIG_FOUND;
  }

  return err;
}

int transportDec_RegisterAscCallback( HANDLE_TRANSPORTDEC hTpDec, const cbUpdateConfig_t cbUpdateConfig, void* user_data)
{
  if (hTpDec == NULL) {
    return -1;
  }
  hTpDec->callbacks.cbUpdateConfig = cbUpdateConfig;
  hTpDec->callbacks.cbUpdateConfigData = user_data;
  return 0;
}

int transportDec_RegisterSscCallback( HANDLE_TRANSPORTDEC hTpDec, const cbSsc_t cbSsc, void* user_data)
{
  if (hTpDec == NULL) {
    return -1;
  }
  hTpDec->callbacks.cbSsc = cbSsc;
  hTpDec->callbacks.cbSscData = user_data;
  return 0;
}

int transportDec_RegisterSbrCallback( HANDLE_TRANSPORTDEC hTpDec, const cbSbr_t cbSbr, void* user_data)
{
  if (hTpDec == NULL) {
    return -1;
  }
  hTpDec->callbacks.cbSbr = cbSbr;
  hTpDec->callbacks.cbSbrData = user_data;
  return 0;
}

TRANSPORTDEC_ERROR transportDec_FillData(
        const HANDLE_TRANSPORTDEC  hTp,
        UCHAR                     *pBuffer,
        const UINT                 bufferSize,
        UINT                      *pBytesValid,
        const INT                  layer )
{
  HANDLE_FDK_BITSTREAM hBs;

  if ( (hTp == NULL)
    || (layer >= 2) ) {
    return TRANSPORTDEC_INVALID_PARAMETER;
  }

  if (*pBytesValid == 0) {
    /* nothing to do */
    return TRANSPORTDEC_OK;
  }

  /* set bitbuffer shortcut */
  hBs = &hTp->bitStream[layer];

  if ( TT_IS_PACKET(hTp->transportFmt) ) {
    if (hTp->numberOfRawDataBlocks == 0) {
    /* For packet based transport, pass input buffer to bitbuffer without copying the data.
       Unfortunately we do not know the actual buffer size. And the FDK bit buffer implementation
       needs a number 2^x. So we assume the maximum of 48 channels with 6144 bits per channel
       and round it up to the next power of 2 => 65536 bytes */
    FDKinitBitStream(hBs, pBuffer, 0x10000, (*pBytesValid)<<3, BS_READER);
    *pBytesValid = 0;
    }
  } else {
    /* ... else feed bitbuffer with new stream data (append). */
    if (hTp->numberOfRawDataBlocks <= 0) {
      FDKfeedBuffer (hBs, pBuffer, bufferSize, pBytesValid) ;
    }
  }

  return TRANSPORTDEC_OK;
}

HANDLE_FDK_BITSTREAM transportDec_GetBitstream( const HANDLE_TRANSPORTDEC hTp, const UINT layer )
{
  return &hTp->bitStream[layer];
}

TRANSPORT_TYPE transportDec_GetFormat( const HANDLE_TRANSPORTDEC hTp )
{
  return hTp->transportFmt;
}

INT transportDec_GetBufferFullness( const HANDLE_TRANSPORTDEC hTp )
{
  INT bufferFullness = -1;

  switch (hTp->transportFmt) {
    case TT_MP4_ADTS:
      if (hTp->parser.adts.bs.adts_fullness != 0x7ff) {
        bufferFullness = hTp->parser.adts.bs.frame_length*8 + hTp->parser.adts.bs.adts_fullness * 32 * getNumberOfEffectiveChannels(hTp->parser.adts.bs.channel_config);
      }
      break;
    case TT_MP4_LOAS:
    case TT_MP4_LATM_MCP0:
    case TT_MP4_LATM_MCP1:
      if (hTp->parser.latm.m_linfo[0][0].m_bufferFullness != 0xff) {
        bufferFullness = hTp->parser.latm.m_linfo[0][0].m_bufferFullness;
      }
      break;
    default:
      break;
  }

  return bufferFullness;
}

/**
 * \brief adjust bit stream position and the end of an access unit.
 * \param hTp transport decoder handle.
 * \return error code.
 */
static
TRANSPORTDEC_ERROR transportDec_AdjustEndOfAccessUnit(HANDLE_TRANSPORTDEC hTp)
{
  HANDLE_FDK_BITSTREAM hBs = &hTp->bitStream[0];
  TRANSPORTDEC_ERROR err = TRANSPORTDEC_OK;

  switch (hTp->transportFmt) {
    case TT_MP4_LOAS:
    case TT_MP4_LATM_MCP0:
    case TT_MP4_LATM_MCP1:
      if ( hTp->numberOfRawDataBlocks == 0 )
      {
        /* Do byte align at the end of AudioMuxElement. */
        FDKbyteAlign(hBs, hTp->globalFramePos);

        /* Check global frame length */
        if (hTp->transportFmt == TT_MP4_LOAS && hTp->parser.latm.m_audioMuxLengthBytes > 0)
        {
          int loasOffset;

          loasOffset = (hTp->parser.latm.m_audioMuxLengthBytes*8 + FDKgetValidBits(hBs)) - hTp->globalFramePos;
          if (loasOffset != 0) {
            FDKpushBiDirectional(hBs, loasOffset);
            /* For ELD and other payloads there is an unknown amount of padding, so ignore unread bits, but
               throw an error only if too many bits where read. */
            if (loasOffset < 0) {
              err = TRANSPORTDEC_PARSE_ERROR;
            }
          }
        }
      }
      break;

    case TT_MP4_ADTS:
      if (hTp->parser.adts.bs.protection_absent == 0)
      {
        int offset;

        /* Calculate offset to end of AU */
        offset  = hTp->parser.adts.rawDataBlockDist[hTp->parser.adts.bs.num_raw_blocks-hTp->numberOfRawDataBlocks]<<3;
        /* CAUTION: The PCE (if available) is declared to be a part of the header! */
        offset -= hTp->accessUnitAnchor[0] - FDKgetValidBits(hBs) + 16 + hTp->parser.adts.bs.num_pce_bits;
        FDKpushBiDirectional(hBs, offset);
      }
      if (hTp->parser.adts.bs.num_raw_blocks > 0 && hTp->parser.adts.bs.protection_absent == 0) {
        /* Note this CRC read currently happens twice because of transportDec_CrcCheck() */
        hTp->parser.adts.crcReadValue = FDKreadBits(hBs, 16);
      }
      if ( hTp->numberOfRawDataBlocks == 0 )
      {
        /* Check global frame length */
        if (hTp->parser.adts.bs.protection_absent == 0)
        {
          int offset;

          offset = (hTp->parser.adts.bs.frame_length*8 - ADTS_SYNCLENGTH + FDKgetValidBits(hBs)) - hTp->globalFramePos;
          if (offset != 0) {
            FDKpushBiDirectional(hBs, offset);
          }
        }
      }
      break;

    default:
      break;
  }

  return err;
}


/**
 * \brief Determine additional buffer fullness contraint due to burst data reception.
 *        The parameter TPDEC_PARAM_BURSTPERIOD must have been set as a precondition.
 * \param hTp transport decoder handle.
 * \param bufferFullness the buffer fullness value of the first frame to be decoded.
 * \param bitsAvail the amount of available bits at the end of the first frame to be decoded.
 * \return error code
 */
static 
TRANSPORTDEC_ERROR additionalHoldOffNeeded(
        HANDLE_TRANSPORTDEC hTp,
        INT                 bufferFullness,
        INT                 bitsAvail
        )
{
  INT checkLengthBits, avgBitsPerFrame;
  INT maxAU; /* maximum number of frames per Master Frame */
  INT samplesPerFrame = hTp->asc->m_samplesPerFrame;
  INT samplingFrequency = (INT)hTp->asc->m_samplingFrequency;

  if ( (hTp->avgBitRate == 0) || (hTp->burstPeriod == 0) ) {
    return TRANSPORTDEC_OK;
  }
  if ( (samplesPerFrame == 0 ) || (samplingFrequency == 0) ) {
    return TRANSPORTDEC_NOT_ENOUGH_BITS;
  }

  /* One Master Frame is sent every hTp->burstPeriod ms */
  maxAU = hTp->burstPeriod * samplingFrequency + (samplesPerFrame*1000 - 1);
  maxAU = maxAU / (samplesPerFrame*1000);
  /* Subtract number of frames which were already held off. */
  maxAU -= hTp->holdOffFrames;

  avgBitsPerFrame = hTp->avgBitRate * samplesPerFrame + (samplingFrequency-1);
  avgBitsPerFrame = avgBitsPerFrame / samplingFrequency;

  /* Consider worst case of bufferFullness quantization. */
  switch (hTp->transportFmt) {
    case TT_MP4_ADIF:
    case TT_MP4_ADTS:
    case TT_MP4_LOAS:
    case TT_MP4_LATM_MCP0:
    case TT_MP4_LATM_MCP1:
      bufferFullness += 31;
      break;
    default:
      break;
  }

  checkLengthBits = bufferFullness + (maxAU-1)*avgBitsPerFrame;

  /* Check if buffer is big enough to fullfill buffer fullness condition */
  if ( (checkLengthBits /*+headerBits*/) > ((TRANSPORTDEC_INBUF_SIZE<<3)-7) ) {
    return TRANSPORTDEC_SYNC_ERROR;
  }

  if ( bitsAvail < checkLengthBits ) {
    return TRANSPORTDEC_NOT_ENOUGH_BITS;
  }
  else {
    return TRANSPORTDEC_OK;
  }
}

static TRANSPORTDEC_ERROR transportDec_readHeader(
        HANDLE_TRANSPORTDEC hTp,
        HANDLE_FDK_BITSTREAM hBs,
        int syncLength,
        int ignoreBufferFullness,
        int *pRawDataBlockLength,
        int *pfTraverseMoreFrames,
        int *pSyncLayerFrameBits,
        int *pfConfigFound,
        int *pHeaderBits
        )
{
  TRANSPORTDEC_ERROR err = TRANSPORTDEC_OK;
  int rawDataBlockLength = *pRawDataBlockLength;
  int fTraverseMoreFrames = (pfTraverseMoreFrames != NULL) ? *pfTraverseMoreFrames : 0;
  int syncLayerFrameBits = (pSyncLayerFrameBits != NULL) ? *pSyncLayerFrameBits : 0;
  int fConfigFound = (pfConfigFound != NULL) ? *pfConfigFound : 0;
  int startPos;

  startPos = FDKgetValidBits(hBs);

  switch (hTp->transportFmt) {
    case TT_MP4_ADTS:
      if (hTp->numberOfRawDataBlocks <= 0)
      {
        int errC;

        hTp->globalFramePos = FDKgetValidBits(hBs);

        /* Parse ADTS header */
        err = adtsRead_DecodeHeader( &hTp->parser.adts, &hTp->asc[0], hBs, ignoreBufferFullness );
        if (err != TRANSPORTDEC_OK) {
          if (err != TRANSPORTDEC_NOT_ENOUGH_BITS) {
            err = TRANSPORTDEC_SYNC_ERROR;
          }
        } else {
          errC = hTp->callbacks.cbUpdateConfig(hTp->callbacks.cbUpdateConfigData, &hTp->asc[0]);
          if (errC != 0) {
            if (errC == TRANSPORTDEC_NEED_TO_RESTART) {
              err = TRANSPORTDEC_NEED_TO_RESTART;
              goto bail;
            } else {
              err = TRANSPORTDEC_SYNC_ERROR;
            }
          } else {
            fConfigFound = 1;
            hTp->numberOfRawDataBlocks = hTp->parser.adts.bs.num_raw_blocks+1;
          }
        }
      }
      else {
        /* Reset CRC because the next bits are the beginning of a raw_data_block() */
        FDKcrcReset(&hTp->parser.adts.crcInfo);
        hTp->parser.adts.bs.num_pce_bits = 0;
      }
      if (err == TRANSPORTDEC_OK) {
        hTp->numberOfRawDataBlocks--;
        rawDataBlockLength = adtsRead_GetRawDataBlockLength(&hTp->parser.adts, (hTp->parser.adts.bs.num_raw_blocks-hTp->numberOfRawDataBlocks));
        if (rawDataBlockLength <= 0) {
          /* No further frame traversal possible. */
          fTraverseMoreFrames = 0;
        }
        syncLayerFrameBits = (hTp->parser.adts.bs.frame_length<<3) - (startPos - FDKgetValidBits(hBs)) - syncLength;
        if (syncLayerFrameBits <= 0) {
          err = TRANSPORTDEC_SYNC_ERROR;
        }
      } else {
        hTp->numberOfRawDataBlocks = 0;
      }
      break;
    case TT_MP4_LOAS:
      if (hTp->numberOfRawDataBlocks <= 0)
      {
        syncLayerFrameBits = FDKreadBits(hBs, 13);
        hTp->parser.latm.m_audioMuxLengthBytes = syncLayerFrameBits;
        syncLayerFrameBits <<= 3;
      }
    case TT_MP4_LATM_MCP1:
    case TT_MP4_LATM_MCP0:
      if (hTp->numberOfRawDataBlocks <= 0)
      {
        hTp->globalFramePos = FDKgetValidBits(hBs);

        err = CLatmDemux_Read(
                hBs,
               &hTp->parser.latm,
                hTp->transportFmt,
               &hTp->callbacks,
                hTp->asc,
               &fConfigFound,
                ignoreBufferFullness);

        if (err != TRANSPORTDEC_OK) {
          if (err != TRANSPORTDEC_NOT_ENOUGH_BITS) {
            err = TRANSPORTDEC_SYNC_ERROR;
          }
        } else {
          hTp->numberOfRawDataBlocks = CLatmDemux_GetNrOfSubFrames(&hTp->parser.latm);
          if (hTp->transportFmt == TT_MP4_LOAS) {
            syncLayerFrameBits -= startPos - FDKgetValidBits(hBs) - (13);            
          }
        }
      } else {
        err = CLatmDemux_ReadPayloadLengthInfo(hBs, &hTp->parser.latm);
        if (err != TRANSPORTDEC_OK) {
          err = TRANSPORTDEC_SYNC_ERROR;
        }
      }
      if (err == TRANSPORTDEC_OK) {
        rawDataBlockLength = CLatmDemux_GetFrameLengthInBits(&hTp->parser.latm);
        hTp->numberOfRawDataBlocks--;
      } else {
        hTp->numberOfRawDataBlocks = 0;
      }
      break;
    default:
      {
        syncLayerFrameBits = 0;
      }
      break;
  }

bail:

  *pRawDataBlockLength = rawDataBlockLength;

  if (pHeaderBits != NULL) {
    *pHeaderBits += startPos - (INT)FDKgetValidBits(hBs);
  }
  if (pfConfigFound != NULL) {
    *pfConfigFound = fConfigFound;
  }

  if (pfTraverseMoreFrames != NULL) {
    *pfTraverseMoreFrames = fTraverseMoreFrames;
  }
  if  (pSyncLayerFrameBits != NULL) {
    *pSyncLayerFrameBits = syncLayerFrameBits;
  }
  if (pfConfigFound != NULL) {
    *pfConfigFound = fConfigFound;
  }

  return err;
}

/* How many bits to advance for synchronization search. */
#define TPDEC_SYNCSKIP 8

static
TRANSPORTDEC_ERROR synchronization(
        HANDLE_TRANSPORTDEC hTp,
        INT                *pHeaderBits
        )
{
  TRANSPORTDEC_ERROR err = TRANSPORTDEC_OK, errFirstFrame = TRANSPORTDEC_OK;
  HANDLE_FDK_BITSTREAM hBs = &hTp->bitStream[0];

  INT syncLayerFrameBits = 0; /* Length of sync layer frame (i.e. LOAS) */
  INT rawDataBlockLength = 0, rawDataBlockLengthPrevious;
  INT totalBits;
  INT headerBits = 0, headerBitsFirstFrame = 0, headerBitsPrevious;
  INT numFramesTraversed = 0, fTraverseMoreFrames, fConfigFound = (hTp->flags & TPDEC_CONFIG_FOUND), startPosFirstFrame = -1;
  INT numRawDataBlocksFirstFrame = 0, numRawDataBlocksPrevious, globalFramePosFirstFrame = 0, rawDataBlockLengthFirstFrame = 0;
  INT ignoreBufferFullness = hTp->flags & (TPDEC_LOST_FRAMES_PENDING|TPDEC_IGNORE_BUFFERFULLNESS|TPDEC_SYNCOK);

  /* Synch parameters */
  INT syncLength;      /* Length of sync word in bits */
  UINT syncWord;       /* Sync word to be found */
  UINT syncMask;       /* Mask for sync word (for adding one bit, so comprising one bit less) */
  C_ALLOC_SCRATCH_START(contextFirstFrame, transportdec_parser_t, 1);

  totalBits = (INT)FDKgetValidBits(hBs);

  if (totalBits <= 0) {
    err = TRANSPORTDEC_NOT_ENOUGH_BITS;
    goto bail;
  }

  fTraverseMoreFrames = (hTp->flags & (TPDEC_MINIMIZE_DELAY|TPDEC_EARLY_CONFIG)) && ! (hTp->flags & TPDEC_SYNCOK);

  /* Set transport specific sync parameters */
  switch (hTp->transportFmt) {
    case TT_MP4_ADTS:
      syncWord = ADTS_SYNCWORD;
      syncLength = ADTS_SYNCLENGTH;
      break;
    case TT_MP4_LOAS:
      syncWord = 0x2B7;
      syncLength = 11;
      break;
    default:
      syncWord = 0;
      syncLength = 0;
      break;
  }

  syncMask = (1<<syncLength)-1;

  do {
    INT bitsAvail = 0;     /* Bits available in bitstream buffer    */
    INT checkLengthBits;   /* Helper to check remaining bits and buffer boundaries */
    UINT synch;            /* Current sync word read from bitstream */

    headerBitsPrevious = headerBits;

    bitsAvail = (INT)FDKgetValidBits(hBs);

    if (hTp->numberOfRawDataBlocks == 0) {
      /* search synchword */

      FDK_ASSERT( (bitsAvail % TPDEC_SYNCSKIP) == 0);

      if ((bitsAvail-syncLength) < TPDEC_SYNCSKIP) {
        err = TRANSPORTDEC_NOT_ENOUGH_BITS;
        headerBits = 0;
      } else {

        synch = FDKreadBits(hBs, syncLength);

        if ( !(hTp->flags & TPDEC_SYNCOK) ) {
          for (; (bitsAvail-syncLength) >= TPDEC_SYNCSKIP; bitsAvail-=TPDEC_SYNCSKIP) {
            if (synch == syncWord) {
              break;
            }
            synch = ((synch << TPDEC_SYNCSKIP) & syncMask) | FDKreadBits(hBs, TPDEC_SYNCSKIP);
          }
        }
        if (synch != syncWord) {
          /* No correct syncword found. */
          err = TRANSPORTDEC_SYNC_ERROR;
        } else {
          err = TRANSPORTDEC_OK;
        }
        headerBits = syncLength;
      }
    } else {
      headerBits = 0;
    }

    /* Save previous raw data block data */
    rawDataBlockLengthPrevious = rawDataBlockLength;
    numRawDataBlocksPrevious = hTp->numberOfRawDataBlocks;

    /* Parse transport header (raw data block granularity) */

    if (err == TRANSPORTDEC_OK )
    {
      err = transportDec_readHeader(
              hTp,
              hBs,
              syncLength,
              ignoreBufferFullness,
             &rawDataBlockLength,
             &fTraverseMoreFrames,
             &syncLayerFrameBits,
             &fConfigFound,
             &headerBits
              );
    }

    bitsAvail -= headerBits;

    checkLengthBits  = syncLayerFrameBits;

    /* Check if the whole frame would fit the bitstream buffer */
    if (err == TRANSPORTDEC_OK) {
      if ( (checkLengthBits+headerBits) > ((TRANSPORTDEC_INBUF_SIZE<<3)-7) ) {
        /* We assume that the size of the transport bit buffer has been
           chosen to meet all system requirements, thus this condition
           is considered a synchronisation error. */
        err = TRANSPORTDEC_SYNC_ERROR;
      } else {
        if ( bitsAvail < checkLengthBits ) {
          err = TRANSPORTDEC_NOT_ENOUGH_BITS;
        }
      }
    }

    if (err == TRANSPORTDEC_NOT_ENOUGH_BITS) {
      break;
    }


    if (err == TRANSPORTDEC_SYNC_ERROR) {
      int bits;

      /* Enforce re-sync of transport headers. */
      hTp->numberOfRawDataBlocks = 0;

      /* Ensure that the bit amount lands at a multiple of TPDEC_SYNCSKIP */
      bits = (bitsAvail + headerBits) % TPDEC_SYNCSKIP;
      /* Rewind - TPDEC_SYNCSKIP, in order to look for a synch one bit ahead next time. */
      FDKpushBiDirectional(hBs, -(headerBits - TPDEC_SYNCSKIP) + bits);
      bitsAvail += headerBits - TPDEC_SYNCSKIP - bits;
      headerBits = 0;
    }

    /* Frame traversal */
    if ( fTraverseMoreFrames )
    {
      /* Save parser context for early config discovery "rewind all frames" */
      if ( (hTp->flags & TPDEC_EARLY_CONFIG) && !(hTp->flags & TPDEC_MINIMIZE_DELAY))
      {
        /* ignore buffer fullness if just traversing additional frames for ECD */
        ignoreBufferFullness = 1;

        /* Save context in order to return later */
        if ( err == TRANSPORTDEC_OK && startPosFirstFrame == -1 ) {
          startPosFirstFrame = FDKgetValidBits(hBs);
          numRawDataBlocksFirstFrame = hTp->numberOfRawDataBlocks;
          globalFramePosFirstFrame = hTp->globalFramePos;
          rawDataBlockLengthFirstFrame = rawDataBlockLength;
          headerBitsFirstFrame = headerBits;
          errFirstFrame = err;
          FDKmemcpy(contextFirstFrame, &hTp->parser, sizeof(transportdec_parser_t));
        }

        /* Break when config was found or it is not possible anymore to find a config */
        if (startPosFirstFrame != -1 && (fConfigFound || err != TRANSPORTDEC_OK))
        {
          /* In case of ECD and sync error, do not rewind anywhere. */
          if (err == TRANSPORTDEC_SYNC_ERROR)
          {
            startPosFirstFrame = -1;
            fConfigFound = 0;
            numFramesTraversed = 0;
          }
          break;
        }
      }

      if (err == TRANSPORTDEC_OK) {
        FDKpushFor(hBs, rawDataBlockLength);
        bitsAvail -= rawDataBlockLength;
        numFramesTraversed++;
        /* Ignore error here itentionally. */
        transportDec_AdjustEndOfAccessUnit(hTp);
      }
    }
  } while ( fTraverseMoreFrames || (err == TRANSPORTDEC_SYNC_ERROR && !(hTp->flags & TPDEC_SYNCOK)));

  /* Restore context in case of ECD frame traversal */
  if ( startPosFirstFrame != -1 && (fConfigFound || err != TRANSPORTDEC_OK) ) {
    FDKpushBiDirectional(hBs, FDKgetValidBits(hBs) - startPosFirstFrame);
    FDKmemcpy(&hTp->parser, contextFirstFrame, sizeof(transportdec_parser_t));
    hTp->numberOfRawDataBlocks = numRawDataBlocksFirstFrame;
    hTp->globalFramePos = globalFramePosFirstFrame;
    rawDataBlockLength = rawDataBlockLengthFirstFrame;
    headerBits = headerBitsFirstFrame;
    err = errFirstFrame;
    numFramesTraversed = 0;
  } 

  /* Additional burst data mode buffer fullness check. */
  if ( !(hTp->flags & (TPDEC_LOST_FRAMES_PENDING|TPDEC_IGNORE_BUFFERFULLNESS|TPDEC_SYNCOK)) && err == TRANSPORTDEC_OK) {
    err = additionalHoldOffNeeded(hTp, transportDec_GetBufferFullness(hTp), FDKgetValidBits(hBs) - syncLayerFrameBits);
    if (err == TRANSPORTDEC_NOT_ENOUGH_BITS) {
      hTp->holdOffFrames++;
    }
  }
  
  /* Rewind for retry because of not enough bits */
  if (err == TRANSPORTDEC_NOT_ENOUGH_BITS) {
    FDKpushBack(hBs, headerBits);
    headerBits = 0;
  }
  else {
    /* reset hold off frame counter */
    hTp->holdOffFrames = 0;
  }

  /* Return to last good frame in case of frame traversal but not ECD. */
  if (numFramesTraversed > 0) {
    FDKpushBack(hBs, rawDataBlockLengthPrevious);
    if (err != TRANSPORTDEC_OK) {
      hTp->numberOfRawDataBlocks = numRawDataBlocksPrevious;
      headerBits = headerBitsPrevious;
    }
    err = TRANSPORTDEC_OK;
  }

bail:
  hTp->auLength[0] = rawDataBlockLength;

  /* Detect pointless TRANSPORTDEC_NOT_ENOUGH_BITS error case, were the bit buffer is already full,
     or no new burst packet fits. Recover by advancing the bit buffer. */
  if ( (TRANSPORTDEC_NOT_ENOUGH_BITS == err) &&  (FDKgetValidBits(hBs) >= ((TRANSPORTDEC_INBUF_SIZE*8 - ((hTp->avgBitRate*hTp->burstPeriod)/1000)) - 7)) )
  {
    FDKpushFor(hBs, TPDEC_SYNCSKIP);
    err = TRANSPORTDEC_SYNC_ERROR;
  }

  if (err == TRANSPORTDEC_OK) {
    hTp->flags |= TPDEC_SYNCOK;
  }

  if (fConfigFound) {
    hTp->flags |= TPDEC_CONFIG_FOUND;
  }

  if (pHeaderBits != NULL) {
    *pHeaderBits = headerBits;
  }

  if (err == TRANSPORTDEC_SYNC_ERROR) {
    hTp->flags &= ~TPDEC_SYNCOK;
  }

  C_ALLOC_SCRATCH_END(contextFirstFrame, transportdec_parser_t, 1);

  return err;
}

/**
 * \brief Synchronize to stream and estimate the amount of missing access units due
 *        to a current synchronization error in case of constant average bit rate.
 */
static
TRANSPORTDEC_ERROR transportDec_readStream ( HANDLE_TRANSPORTDEC hTp, const UINT layer )
{

  TRANSPORTDEC_ERROR error = TRANSPORTDEC_OK;
  HANDLE_FDK_BITSTREAM hBs = &hTp->bitStream[layer];
  INT nAU = -1;
  INT headerBits;
  INT bitDistance, bfDelta;

  /* Obtain distance to next synch word */
  bitDistance = FDKgetValidBits(hBs);
  error = synchronization(hTp, &headerBits);
  bitDistance -= FDKgetValidBits(hBs);


  FDK_ASSERT(bitDistance >= 0);

  if (error == TRANSPORTDEC_SYNC_ERROR || (hTp->flags & TPDEC_LOST_FRAMES_PENDING))
  {
    /* Check if estimating lost access units is feasible. */
    if (hTp->avgBitRate > 0 && hTp->asc[0].m_samplesPerFrame > 0 && hTp->asc[0].m_samplingFrequency > 0)
    {
      if (error == TRANSPORTDEC_OK)
      {
        int aj;

        aj = transportDec_GetBufferFullness(hTp);
        if (aj > 0) {
          bfDelta = aj;
        } else {
          bfDelta = 0;
        }
        /* sync was ok: last of a series of bad access units. */
        hTp->flags &= ~TPDEC_LOST_FRAMES_PENDING;
        /* Add up bitDistance until end of the current frame. Later we substract
           this frame from the grand total, since this current successfully synchronized
           frame should not be skipped of course; but it must be accounted into the
           bufferfulness math. */
        bitDistance += hTp->auLength[0];
      } else {
        if ( !(hTp->flags & TPDEC_LOST_FRAMES_PENDING) ) {
          /* sync not ok: one of many bad access units. */
          hTp->flags |= TPDEC_LOST_FRAMES_PENDING;
          bfDelta = - (INT)hTp->lastValidBufferFullness;
        } else {
          bfDelta = 0;
        }
      }

      {
        int num, denom;

        /* Obtain estimate of number of lost frames */
        num = hTp->asc[0].m_samplingFrequency * (bfDelta + bitDistance) + hTp->remainder;
        denom = hTp->avgBitRate * hTp->asc[0].m_samplesPerFrame;
        if (num > 0) {
          nAU = num / denom;
          hTp->remainder = num % denom;
        } else {
          hTp->remainder = num;
        }

        if (error == TRANSPORTDEC_OK)
        {
          /* Final adjustment of remainder, taken -1 into account because current
             frame should not be skipped, thus substract -1 or do nothing instead
             of +1-1 accordingly. */
          if ( (denom - hTp->remainder) >= hTp->remainder ) {
            nAU--;
          }
            
          if (nAU < 0) {
            /* There was one frame too much concealed, so unfortunately we will have to skip one good frame. */
            transportDec_EndAccessUnit(hTp);
            error = synchronization(hTp, &headerBits);             
            nAU = -1;
#ifdef DEBUG
            FDKprintf("ERROR: Bufferfullness accounting failed. remainder=%d, nAU=%d\n", hTp->remainder, nAU);
#endif
          }
          hTp->remainder = 0;
          /* Enforce last missed frames to be concealed. */
          if (nAU > 0) {
            FDKpushBack(hBs, headerBits);
          }
        }
      }
    }
  }

  /* Be sure that lost frames are handled correctly. This is necessary due to some
     sync error sequences where later it turns out that there is not enough data, but
     the bits upto the sync word are discarded, thus causing a value of nAU > 0 */
  if (nAU > 0) {
    error = TRANSPORTDEC_SYNC_ERROR;
  }

  hTp->missingAccessUnits = nAU;

  return error;
}

/* returns error code */
TRANSPORTDEC_ERROR transportDec_ReadAccessUnit( const HANDLE_TRANSPORTDEC hTp, const UINT layer )
{
  TRANSPORTDEC_ERROR err = TRANSPORTDEC_OK;
  HANDLE_FDK_BITSTREAM hBs;

  if (!hTp) {
    return TRANSPORTDEC_INVALID_PARAMETER;
  }

  hBs = &hTp->bitStream[layer];

  if ((INT)FDKgetValidBits(hBs) <= 0) {
    err = TRANSPORTDEC_NOT_ENOUGH_BITS;
  }

  switch (hTp->transportFmt) {

    case TT_MP4_ADIF:
      /* Read header if not already done */
      if (!(hTp->flags & TPDEC_CONFIG_FOUND))
      {
        CProgramConfig *pce;

        AudioSpecificConfig_Init(&hTp->asc[0]);
        pce = &hTp->asc[0].m_progrConfigElement;
        err = adifRead_DecodeHeader(&hTp->parser.adif, pce, hBs);
        if (err)
          goto bail;

        /* Map adif header to ASC */
        hTp->asc[0].m_aot                    = (AUDIO_OBJECT_TYPE)(pce->Profile + 1);
        hTp->asc[0].m_samplingFrequencyIndex = pce->SamplingFrequencyIndex;
        hTp->asc[0].m_samplingFrequency      = SamplingRateTable[pce->SamplingFrequencyIndex];
        hTp->asc[0].m_channelConfiguration   = 0;
        hTp->asc[0].m_samplesPerFrame        = 1024;
        hTp->avgBitRate                      = hTp->parser.adif.BitRate;

        /* Call callback to decoder. */
        {
          int errC;

          errC = hTp->callbacks.cbUpdateConfig(hTp->callbacks.cbUpdateConfigData, &hTp->asc[0]);
          if (errC == 0) {
            hTp->flags |= TPDEC_CONFIG_FOUND;
          } else {
            err = TRANSPORTDEC_PARSE_ERROR;
            goto bail;
          }
        }
      }
      hTp->auLength[layer] = -1; /* Access Unit data length is unknown. */
      break;

    case TT_MP4_RAW:
      /* One Access Unit was filled into buffer.
         So get the length out of the buffer. */
      hTp->auLength[layer] = FDKgetValidBits(hBs);
      hTp->flags |= TPDEC_SYNCOK;
      break;

    case TT_MP4_LATM_MCP0:
    case TT_MP4_LATM_MCP1:
      {
        int fConfigFound = hTp->flags & TPDEC_CONFIG_FOUND;
        err = transportDec_readHeader(hTp, hBs, 0, 1, &hTp->auLength[layer], NULL, NULL, &fConfigFound, NULL);
        if (fConfigFound) {
          hTp->flags |= TPDEC_CONFIG_FOUND;
        }
      }
      break;

    case TT_RSVD50:
    case TT_MP4_ADTS:
    case TT_MP4_LOAS:
      err = transportDec_readStream(hTp, layer);
      break;

    default:
      err = TRANSPORTDEC_UNSUPPORTED_FORMAT;
      break;
  }

  if (err == TRANSPORTDEC_OK) {
    hTp->accessUnitAnchor[layer] = FDKgetValidBits(hBs);
  } else {
    hTp->accessUnitAnchor[layer] = 0;
  }

bail:
  return err;
}

INT transportDec_GetAuBitsRemaining( const HANDLE_TRANSPORTDEC hTp, const UINT layer )
{
  INT bits;

  if (hTp->accessUnitAnchor[layer] > 0 && hTp->auLength[layer] > 0) {
    bits = hTp->auLength[layer] - (hTp->accessUnitAnchor[layer] - FDKgetValidBits(&hTp->bitStream[layer]));
  } else {
    bits = FDKgetValidBits(&hTp->bitStream[layer]);
  }

  return bits;
}

INT transportDec_GetAuBitsTotal( const HANDLE_TRANSPORTDEC hTp, const UINT layer )
{
  return hTp->auLength[layer];
}

TRANSPORTDEC_ERROR transportDec_GetMissingAccessUnitCount ( INT *pNAccessUnits, HANDLE_TRANSPORTDEC hTp )
{
  *pNAccessUnits = hTp->missingAccessUnits;

  return TRANSPORTDEC_OK;
}

/* Inform the transportDec layer that reading of access unit has finished. */
TRANSPORTDEC_ERROR transportDec_EndAccessUnit(HANDLE_TRANSPORTDEC hTp)
{
  TRANSPORTDEC_ERROR err = TRANSPORTDEC_OK;


  err = transportDec_AdjustEndOfAccessUnit(hTp);

  switch (hTp->transportFmt) {
    default:
      break;
  }

  return err;
}

TRANSPORTDEC_ERROR transportDec_SetParam ( const HANDLE_TRANSPORTDEC hTp,
                                           const TPDEC_PARAM        param,
                                           const INT                value)
{
  TRANSPORTDEC_ERROR error = TRANSPORTDEC_OK;

  switch (param) {
    case TPDEC_PARAM_MINIMIZE_DELAY:
      if (value) {
        hTp->flags |= TPDEC_MINIMIZE_DELAY;
      } else {
        hTp->flags &= ~TPDEC_MINIMIZE_DELAY;
      }
      break;
    case TPDEC_PARAM_EARLY_CONFIG:
      if (value) {
        hTp->flags |= TPDEC_EARLY_CONFIG;
      } else {
        hTp->flags &= ~TPDEC_EARLY_CONFIG;
      }
      break;
    case TPDEC_PARAM_IGNORE_BUFFERFULLNESS:
      if (value) {
        hTp->flags |= TPDEC_IGNORE_BUFFERFULLNESS;
      } else {
        hTp->flags &= ~TPDEC_IGNORE_BUFFERFULLNESS;
      }
      break;
    case TPDEC_PARAM_SET_BITRATE:
      hTp->avgBitRate = value;
      break;
    case TPDEC_PARAM_BURST_PERIOD:
      hTp->burstPeriod = value;
      break;
    case TPDEC_PARAM_RESET:
      {
        int i;

        for (i=0; i<(1*2); i++) {
          FDKresetBitbuffer(&hTp->bitStream[i]);
          hTp->auLength[i] = 0;
          hTp->accessUnitAnchor[i] = 0;
        }
        hTp->flags &= ~(TPDEC_SYNCOK|TPDEC_LOST_FRAMES_PENDING);
        if (hTp->transportFmt != TT_MP4_ADIF) {
          hTp->flags &= ~TPDEC_CONFIG_FOUND;
        }
        hTp->remainder = 0;
        hTp->avgBitRate = 0;
        hTp->missingAccessUnits = 0;
        hTp->numberOfRawDataBlocks = 0;
        hTp->globalFramePos = 0;
        hTp->holdOffFrames = 0;
      }
      break;
  }

  return error;
}

UINT transportDec_GetNrOfSubFrames(HANDLE_TRANSPORTDEC hTp)
{
  UINT nSubFrames = 0;

  if (hTp == NULL)
    return 0;

  if (hTp->transportFmt==TT_MP4_LATM_MCP1 || hTp->transportFmt==TT_MP4_LATM_MCP0 || hTp->transportFmt==TT_MP4_LOAS)
    nSubFrames = CLatmDemux_GetNrOfSubFrames(&hTp->parser.latm);
  else if (hTp->transportFmt==TT_MP4_ADTS)
    nSubFrames = hTp->parser.adts.bs.num_raw_blocks;

  return nSubFrames;
}

void transportDec_Close(HANDLE_TRANSPORTDEC *phTp)
{
  if (phTp != NULL)
  {
    if (*phTp != NULL) {
      if ( ! TT_IS_PACKET((*phTp)->transportFmt) ) {
        FreeRam_TransportDecoderBuffer(&(*phTp)->bsBuffer);
      }
      if (*phTp != NULL) {
        FreeRam_TransportDecoder(phTp);
      }
    }
  }
}

TRANSPORTDEC_ERROR transportDec_GetLibInfo( LIB_INFO *info )
{
  int i;

  if (info == NULL) {
    return TRANSPORTDEC_UNKOWN_ERROR;
  }

  /* search for next free tab */
  for (i = 0; i < FDK_MODULE_LAST; i++) {
    if (info[i].module_id == FDK_NONE) break;
  }
  if (i == FDK_MODULE_LAST) return TRANSPORTDEC_UNKOWN_ERROR;
  info += i;

  info->module_id  = FDK_TPDEC;
  info->build_date = __DATE__;
  info->build_time = __TIME__;
  info->title      = TP_LIB_TITLE;
  info->version    = LIB_VERSION(TP_LIB_VL0, TP_LIB_VL1, TP_LIB_VL2);
  LIB_VERSION_STRING(info);
  info->flags = 0
    | CAPF_ADIF
    | CAPF_ADTS
    | CAPF_LATM
    | CAPF_LOAS
    | CAPF_RAWPACKETS
    ;

  return TRANSPORTDEC_OK; /* FDKERR_NOERROR; */
}


int  transportDec_CrcStartReg(HANDLE_TRANSPORTDEC pTp, INT mBits)
{
  switch (pTp->transportFmt) {
  case TT_MP4_ADTS:
    return adtsRead_CrcStartReg(&pTp->parser.adts, &pTp->bitStream[0], mBits);
  default:
    return 0;
  }
}

void transportDec_CrcEndReg(HANDLE_TRANSPORTDEC pTp, INT reg)
{
  switch (pTp->transportFmt) {
  case TT_MP4_ADTS:
    adtsRead_CrcEndReg(&pTp->parser.adts, &pTp->bitStream[0], reg);
    break;
  default:
    break;
  }
}

TRANSPORTDEC_ERROR transportDec_CrcCheck(HANDLE_TRANSPORTDEC pTp)
{
  switch (pTp->transportFmt) {
  case TT_MP4_ADTS:
    if ( (pTp->parser.adts.bs.num_raw_blocks > 0) && (pTp->parser.adts.bs.protection_absent == 0) )
    {
      HANDLE_FDK_BITSTREAM hBs = &pTp->bitStream[0];
      
      transportDec_AdjustEndOfAccessUnit(pTp);
    }
    return adtsRead_CrcCheck(&pTp->parser.adts);
  default:
    return TRANSPORTDEC_OK;
  }
}