path: root/libMpegTPEnc/src/tpenc_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
your modifications thereto in source code form.

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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
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
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or business interruption, however caused and on any theory of liability, whether in contract, strict
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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 Encoder  ************************

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

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

#include "tpenc_lib.h"

/* library info */
#include "version"

#define MODULE_NAME "transportEnc"

#include "tpenc_asc.h"
#include "conv_string.h"

#include "tpenc_adts.h"

#include "tpenc_adif.h"

#include "tpenc_dab.h"

#include "tpenc_latm.h"

typedef struct {
  int curSubFrame;
  int nSubFrames;
  int prevBits;
} RAWPACKETS_INFO;

struct TRANSPORTENC
{
  CODER_CONFIG config;
  TRANSPORT_TYPE transportFmt;          /*!< MPEG4 transport type. */

  FDK_BITSTREAM bitStream;
  UCHAR *bsBuffer;
  INT bsBufferSize;

  INT pceFrameCounter;                  /*!< Indicates frame period when PCE must be written in raw_data_block.
                                             -1 means not to write a PCE in raw_dat_block. */
  union {
    STRUCT_ADTS adts;

    ADIF_INFO adif;

    STRUCT_DAB dab;

    LATM_STREAM latm;

    RAWPACKETS_INFO raw;



  } writer;

  CSTpCallBacks callbacks;
};

typedef struct _TRANSPORTENC_STRUCT TRANSPORTENC_STRUCT;


/*
 * MEMORY Declaration
 */

C_ALLOC_MEM(Ram_TransportEncoder, TRANSPORTENC, 1)

TRANSPORTENC_ERROR transportEnc_Open( HANDLE_TRANSPORTENC *phTpEnc )
{
  HANDLE_TRANSPORTENC hTpEnc;

  if ( phTpEnc == NULL ){
    return TRANSPORTENC_INVALID_PARAMETER;
  }

  hTpEnc = GetRam_TransportEncoder(0);

  if ( hTpEnc == NULL ) {
    return TRANSPORTENC_NO_MEM;
  }

  *phTpEnc = hTpEnc;
  return TRANSPORTENC_OK;
}

/**
 * \brief  Get frame period of PCE in raw_data_block.
 *
 *  - Write PCE only if necessary. PCE can be part of the ASC if chConfig==0 whererfore
 *    no additonal PCE will be written in raw_data_block.
 * - A matrixMixdown coefficient can only be written if chConfig is 5.0 or 5.1.
 * - The PCE repetition rate in raw_data_block can be controlled via headerPeriod parameter.
 *
 * \param channelConfig         Channel Configuration derived from Channel Mode
 * \param transportFmt          Format of the transport to be written.
 * \param headerPeriod          Chosen PCE frame repetition rate.
 * \param matrixMixdownA        Indicates if a valid Matrix Mixdown coefficient is available.
 *
 * \return  PCE frame repetition rate. -1 means no PCE present in raw_data_block.
 */
static INT getPceRepetitionRate(
        const int            channelConfig,
        const TRANSPORT_TYPE transportFmt,
        const int            headerPeriod,
        const int            matrixMixdownA
        )
{
  INT pceFrameCounter = -1; /* variable to be returned */

  if (headerPeriod>0) {
    switch ( channelConfig ) {
      case 0:
        switch (transportFmt) {
          case TT_MP4_ADTS:
          case TT_MP4_LATM_MCP0:
          case TT_MP4_RAW:
            pceFrameCounter = headerPeriod;
            break;
          case TT_MP4_ADIF:                  /* ADIF header comprises PCE */
          case TT_MP4_LOAS:                  /* PCE in ASC if chChonfig==0 */
          case TT_MP4_LATM_MCP1:             /* PCE in ASC if chChonfig==0 */
          case TT_DRM:                       /* PCE not allowed in DRM */
          case TT_DABPLUS:
          default:
            pceFrameCounter = -1;            /* no PCE in raw_data_block */
        }
        break;
      case 5: /* MODE_1_2_2 */
      case 6: /* MODE_1_2_2_1 */
        /* matrixMixdownCoefficient can only be written if 5.0 and 5.1 config present. */
        if (matrixMixdownA!=0) {
          switch (transportFmt) {
            case TT_MP4_ADIF:                /* ADIF header comprises PCE */
            case TT_MP4_ADTS:
            case TT_MP4_LOAS:                /* no PCE in ASC because chConfig!=0 */
            case TT_MP4_LATM_MCP1:           /* no PCE in ASC because chConfig!=0 */
            case TT_MP4_LATM_MCP0:
            case TT_MP4_RAW:
              pceFrameCounter = headerPeriod;
              break;
            case TT_DRM:                     /* PCE not allowed in DRM */
            case TT_DABPLUS:
            default:
              pceFrameCounter = -1;          /* no PCE in raw_data_block */
          } /* switch transportFmt */
        } /* if matrixMixdownA!=0 */
        break;
      default:
        pceFrameCounter = -1;                /* no PCE in raw_data_block */
    } /* switch getChannelConfig() */
  } /* if headerPeriod>0  */
  else {
    pceFrameCounter = -1;                    /* no PCE in raw_data_block */
  }

  return pceFrameCounter;
}

TRANSPORTENC_ERROR transportEnc_Init(
        HANDLE_TRANSPORTENC hTpEnc,
        UCHAR             *bsBuffer,
        INT                bsBufferSize,
        TRANSPORT_TYPE     transportFmt,
        CODER_CONFIG      *cconfig,
        UINT               flags
        )
{
  /* Copy configuration structure */
  FDKmemcpy(&hTpEnc->config, cconfig, sizeof(CODER_CONFIG));

  /* Init transportEnc struct. */
  hTpEnc->transportFmt = transportFmt;

  hTpEnc->bsBuffer = bsBuffer;
  hTpEnc->bsBufferSize = bsBufferSize;

  FDKinitBitStream(&hTpEnc->bitStream, hTpEnc->bsBuffer, hTpEnc->bsBufferSize, 0, BS_WRITER);

  switch (transportFmt) {

  case TT_MP4_ADIF:
    /* Sanity checks */
    if ( (hTpEnc->config.aot != AOT_AAC_LC)
       ||(hTpEnc->config.samplesPerFrame != 1024))
    {
      return TRANSPORTENC_INVALID_PARAMETER;
    }
    hTpEnc->writer.adif.headerWritten = 0;
    hTpEnc->writer.adif.samplingRate = hTpEnc->config.samplingRate;
    hTpEnc->writer.adif.bitRate = hTpEnc->config.bitRate;
    hTpEnc->writer.adif.profile = ((int)hTpEnc->config.aot) - 1;
    hTpEnc->writer.adif.cm = hTpEnc->config.channelMode;
    hTpEnc->writer.adif.bVariableRate = 0;
    hTpEnc->writer.adif.instanceTag = 0;
    break;

  case TT_MP4_ADTS:
    /* Sanity checks */
    if ( ( hTpEnc->config.aot != AOT_AAC_LC)
       || ((hTpEnc->config.samplesPerFrame != 1024) &&
           (hTpEnc->config.samplesPerFrame != 960) ) )
    {
      return TRANSPORTENC_INVALID_PARAMETER;
    }
    if ( adtsWrite_Init(&hTpEnc->writer.adts, &hTpEnc->config) != 0) {
      return TRANSPORTENC_INVALID_PARAMETER;
    }
    break;

  case TT_DABPLUS:
    /* Sanity checks */
    if ( ( hTpEnc->config.aot != AOT_AAC_LC)
       ||(hTpEnc->config.samplesPerFrame != 960) )
    {
      return TRANSPORTENC_INVALID_PARAMETER;
    }
    if ( dabWrite_Init(&hTpEnc->writer.dab, &hTpEnc->config) != 0) {
      return TRANSPORTENC_INVALID_PARAMETER;
    }
    break;

  case TT_MP4_LOAS:
  case TT_MP4_LATM_MCP0:
  case TT_MP4_LATM_MCP1:
    {
      TRANSPORTENC_ERROR error;

      error = transportEnc_Latm_Init(
                &hTpEnc->writer.latm,
                &hTpEnc->bitStream,
                &hTpEnc->config,
                 flags & TP_FLAG_LATM_AMV,
                 transportFmt,
                &hTpEnc->callbacks
                 );
      if (error != TRANSPORTENC_OK) {
        return error;
      }
    }
    break;

  case TT_MP4_RAW:
    hTpEnc->writer.raw.curSubFrame = 0;
    hTpEnc->writer.raw.nSubFrames = hTpEnc->config.nSubFrames;
    break;



  default:
    return TRANSPORTENC_INVALID_PARAMETER;
  }

  /* pceFrameCounter indicates if PCE must be written in raw_data_block. */
  hTpEnc->pceFrameCounter = getPceRepetitionRate(
                    getChannelConfig(hTpEnc->config.channelMode),
                    transportFmt,
                    hTpEnc->config.headerPeriod,
                    hTpEnc->config.matrixMixdownA);

  return TRANSPORTENC_OK;
}

HANDLE_FDK_BITSTREAM transportEnc_GetBitstream( HANDLE_TRANSPORTENC hTp )
{
  return &hTp->bitStream;
}

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


TRANSPORTENC_ERROR transportEnc_WriteAccessUnit(
                                               HANDLE_TRANSPORTENC hTp,
                                               INT frameUsedBits,
                                               int bufferFullness,
                                               int ncc
                                              )
{
  TRANSPORTENC_ERROR err = TRANSPORTENC_OK;

  if (!hTp) {
    return TRANSPORTENC_INVALID_PARAMETER;
  }
  HANDLE_FDK_BITSTREAM hBs = &hTp->bitStream;

  /* In case of writing PCE in raw_data_block frameUsedBits must be adapted. */
  if (hTp->pceFrameCounter>=hTp->config.headerPeriod) {
    frameUsedBits += transportEnc_GetPCEBits(hTp->config.channelMode, hTp->config.matrixMixdownA, 3); /* Consider 3 bits ID signalling in alignment */
  }

  switch (hTp->transportFmt) {
    case TT_MP4_ADIF:
      FDKinitBitStream(&hTp->bitStream, hTp->bsBuffer, hTp->bsBufferSize, 0, BS_WRITER);
      adifWrite_EncodeHeader(
             &hTp->writer.adif,
              hBs,
              bufferFullness
              );
      break;
    case TT_MP4_ADTS:
      bufferFullness /= ncc;                          /* Number of Considered Channels */
      bufferFullness /= 32;
      bufferFullness = FDKmin(0x7FF, bufferFullness); /* Signal variable rate */
      adtsWrite_EncodeHeader(
             &hTp->writer.adts,
             &hTp->bitStream,
              bufferFullness,
              frameUsedBits
              );
      break;
    case TT_DABPLUS:
      bufferFullness /= ncc;                          /* Number of Considered Channels */
      bufferFullness /= 32;
      bufferFullness = FDKmin(0x7FF, bufferFullness); /* Signal variable rate */
      dabWrite_EncodeHeader(
             &hTp->writer.dab,
             &hTp->bitStream,
              bufferFullness,
              frameUsedBits
              );
      break;
    case TT_MP4_LOAS:
    case TT_MP4_LATM_MCP0:
    case TT_MP4_LATM_MCP1:
      bufferFullness /= ncc;                         /* Number of Considered Channels */
      bufferFullness /= 32;
      bufferFullness = FDKmin(0xFF, bufferFullness); /* Signal variable rate */
      transportEnc_LatmWrite(
             &hTp->writer.latm,
              hBs,
              frameUsedBits,
              bufferFullness,
             &hTp->callbacks
              );
    break;
    case TT_MP4_RAW:
      if (hTp->writer.raw.curSubFrame >= hTp->writer.raw.nSubFrames) {
        hTp->writer.raw.curSubFrame = 0;
        FDKinitBitStream(&hTp->bitStream, hTp->bsBuffer, hTp->bsBufferSize, 0, BS_WRITER);
      }
      hTp->writer.raw.prevBits = FDKgetValidBits(hBs);
      break;
    default:
      err = TRANSPORTENC_UNSUPPORTED_FORMAT;
      break;
  }

  /* Write PCE in raw_data_block if required */
  if (hTp->pceFrameCounter>=hTp->config.headerPeriod) {
    INT crcIndex = 0;
    /* Align inside PCE with repsect to the first bit of the raw_data_block() */
    UINT alignAnchor = FDKgetValidBits(&hTp->bitStream);

    /* Write PCE element ID bits */
    FDKwriteBits(&hTp->bitStream, ID_PCE, 3);

    if ( (hTp->transportFmt==TT_MP4_ADTS) && !hTp->writer.adts.protection_absent) {
      crcIndex = adtsWrite_CrcStartReg(&hTp->writer.adts, &hTp->bitStream, 0);
    }

    /* Write PCE as first raw_data_block element */
    transportEnc_writePCE(&hTp->bitStream, hTp->config.channelMode, hTp->config.samplingRate, 0, 1, hTp->config.matrixMixdownA, (hTp->config.flags&CC_PSEUDO_SURROUND)?1:0, alignAnchor);

    if ( (hTp->transportFmt==TT_MP4_ADTS) && !hTp->writer.adts.protection_absent) {
      adtsWrite_CrcEndReg(&hTp->writer.adts, &hTp->bitStream, crcIndex);
    }
    hTp->pceFrameCounter = 0; /* reset pce frame counter */
  }

  if (hTp->pceFrameCounter!=-1) {
    hTp->pceFrameCounter++; /* Update pceFrameCounter only if PCE writing is active. */
  }

  return err;
}


TRANSPORTENC_ERROR transportEnc_EndAccessUnit(HANDLE_TRANSPORTENC hTp, int *bits)
{
  switch (hTp->transportFmt) {
    case TT_MP4_LATM_MCP0:
    case TT_MP4_LATM_MCP1:
    case TT_MP4_LOAS:
      transportEnc_LatmAdjustSubframeBits(&hTp->writer.latm, bits);
      break;
    case TT_MP4_ADTS:
      adtsWrite_EndRawDataBlock(&hTp->writer.adts, &hTp->bitStream, bits);
      break;
    case TT_DABPLUS:
      dabWrite_EndRawDataBlock(&hTp->writer.dab, &hTp->bitStream, bits);
      break;
    case TT_MP4_ADIF:
      /* Substract ADIF header from AU bits, not to be considered. */
      *bits -= adifWrite_GetHeaderBits(&hTp->writer.adif);
      hTp->writer.adif.headerWritten = 1;
      break;
    case TT_MP4_RAW:
      *bits -= hTp->writer.raw.prevBits;
      break;
    default:
      break;
  }

  return TRANSPORTENC_OK;
}

TRANSPORTENC_ERROR transportEnc_GetFrame(HANDLE_TRANSPORTENC hTpEnc, int *nbytes)
{
  HANDLE_FDK_BITSTREAM hBs = &hTpEnc->bitStream;

  switch (hTpEnc->transportFmt) {
    case TT_MP4_LATM_MCP0:
    case TT_MP4_LATM_MCP1:
    case TT_MP4_LOAS:
      *nbytes = hTpEnc->bsBufferSize;
      transportEnc_LatmGetFrame(&hTpEnc->writer.latm, hBs, nbytes);
      break;
    case TT_MP4_ADTS:
      if (hTpEnc->writer.adts.currentBlock >= hTpEnc->writer.adts.num_raw_blocks+1) {
        *nbytes = (FDKgetValidBits(hBs) + 7)>>3;
        hTpEnc->writer.adts.currentBlock = 0;
      } else {
        *nbytes = 0;
      }
      break;
    case TT_DABPLUS:
      if (hTpEnc->writer.dab.currentBlock >= hTpEnc->writer.dab.num_raw_blocks+1) {
        *nbytes = (FDKgetValidBits(hBs) + 7)>>3;
        hTpEnc->writer.dab.currentBlock = 0;
      } else {
        *nbytes = 0;
      }
      break;
    case TT_MP4_ADIF:
      FDK_ASSERT((INT)FDKgetValidBits(hBs) >= 0);
      *nbytes = (FDKgetValidBits(hBs) + 7)>>3;
      break;
    case TT_MP4_RAW:
      FDKsyncCache(hBs);
      hTpEnc->writer.raw.curSubFrame++;
      *nbytes = ((FDKgetValidBits(hBs)-hTpEnc->writer.raw.prevBits) + 7)>>3;
      break;
    default:
      break;
  }

  return TRANSPORTENC_OK;
}

INT transportEnc_GetStaticBits( HANDLE_TRANSPORTENC hTp, int auBits )
{
  INT nbits = 0, nPceBits = 0;

  /* Write PCE within raw_data_block in transport lib. */
  if (hTp->pceFrameCounter>=hTp->config.headerPeriod) {
    nPceBits = transportEnc_GetPCEBits(hTp->config.channelMode, hTp->config.matrixMixdownA, 3); /* Consider 3 bits ID signalling in alignment */
    auBits += nPceBits; /* Adapt required raw_data_block bit consumtpion for AU length information e.g. in LATM/LOAS configuration. */
  }

  switch (hTp->transportFmt) {
    case TT_MP4_ADIF:
    case TT_MP4_RAW:
      nbits = 0; /* Do not consider the ADIF header into the total bitrate */
      break;
    case TT_MP4_ADTS:
      nbits = adtsWrite_GetHeaderBits(&hTp->writer.adts);
      break;
    case TT_DABPLUS:
      nbits = dabWrite_CountTotalBitDemandHeader(&hTp->writer.dab, auBits);
      break;
    case TT_MP4_LOAS:
    case TT_MP4_LATM_MCP0:
    case TT_MP4_LATM_MCP1:
      nbits = transportEnc_LatmCountTotalBitDemandHeader( &hTp->writer.latm, auBits );
      break;
    default:
      nbits = 0;
      break;
  }

  /* PCE is written in the transport library therefore the bit consumption is part of the transport static bits. */
  nbits += nPceBits;

  return nbits;
}

void transportEnc_Close(HANDLE_TRANSPORTENC *phTp)
{
  if (phTp != NULL)
  {
    if (*phTp != NULL) {
      FreeRam_TransportEncoder(phTp);
    }
  }
}

int transportEnc_CrcStartReg(HANDLE_TRANSPORTENC hTpEnc, int mBits)
{
  int crcReg = 0;

  switch (hTpEnc->transportFmt) {
  case TT_MP4_ADTS:
    crcReg = adtsWrite_CrcStartReg(&hTpEnc->writer.adts, &hTpEnc->bitStream, mBits);
    break;
  case TT_DABPLUS:
    crcReg = dabWrite_CrcStartReg(&hTpEnc->writer.dab, &hTpEnc->bitStream, mBits);
    break;
  default:
    break;
  }

  return crcReg;
}

void transportEnc_CrcEndReg(HANDLE_TRANSPORTENC hTpEnc, int reg)
{
  switch (hTpEnc->transportFmt) {
  case TT_MP4_ADTS:
    adtsWrite_CrcEndReg(&hTpEnc->writer.adts, &hTpEnc->bitStream, reg);
    break;
  case TT_DABPLUS:
    dabWrite_CrcEndReg(&hTpEnc->writer.dab, &hTpEnc->bitStream, reg);
    break;
  default:
    break;
  }
}


TRANSPORTENC_ERROR transportEnc_GetConf(HANDLE_TRANSPORTENC  hTpEnc,
                                        CODER_CONFIG        *cc,
                                        FDK_BITSTREAM       *dataBuffer,
                                        UINT                *confType)
{
  TRANSPORTENC_ERROR tpErr = TRANSPORTENC_OK;
  HANDLE_LATM_STREAM hLatmConfig = &hTpEnc->writer.latm;

  *confType = 0; /* set confType variable to default */

  /* write StreamMuxConfig or AudioSpecificConfig depending on format used */
  switch (hTpEnc->transportFmt)
  {
    case TT_MP4_LATM_MCP0:
    case TT_MP4_LATM_MCP1:
    case TT_MP4_LOAS:
      tpErr = CreateStreamMuxConfig(hLatmConfig, dataBuffer, 0, &hTpEnc->callbacks);
      *confType = 1; /* config is SMC */
      break;
    default:
      if (transportEnc_writeASC(dataBuffer, cc, &hTpEnc->callbacks) != 0) {
        tpErr = TRANSPORTENC_UNKOWN_ERROR;
      }
  }

  return tpErr;

}

TRANSPORTENC_ERROR transportEnc_GetLibInfo( LIB_INFO *info )
{
  int i;

  if (info == NULL) {
    return TRANSPORTENC_INVALID_PARAMETER;
  }
  /* 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 TRANSPORTENC_UNKOWN_ERROR;
  }
  info += i;

  info->module_id = FDK_TPENC;
  info->version = LIB_VERSION(TP_LIB_VL0, TP_LIB_VL1, TP_LIB_VL2);
  LIB_VERSION_STRING(info);
  info->build_date = __DATE__;
  info->build_time = __TIME__;
  info->title = TP_LIB_TITLE;

  /* Set flags */
  info->flags = 0
    | CAPF_ADIF
    | CAPF_ADTS
    | CAPF_LATM
    | CAPF_LOAS
    | CAPF_RAWPACKETS
    | CAPF_DAB_AAC
    ;

  return TRANSPORTENC_OK;
}