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PacketHeader.cpp

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//*****************************************************************
/*
  JackTrip: A System for High-Quality Audio Network Performance
  over the Internet

  Copyright (c) 2008 Juan-Pablo Caceres, Chris Chafe.
  SoundWIRE group at CCRMA, Stanford University.
  
  Permission is hereby granted, free of charge, to any person
  obtaining a copy of this software and associated documentation
  files (the "Software"), to deal in the Software without
  restriction, including without limitation the rights to use,
  copy, modify, merge, publish, distribute, sublicense, and/or sell
  copies of the Software, and to permit persons to whom the
  Software is furnished to do so, subject to the following
  conditions:
  
  The above copyright notice and this permission notice shall be
  included in all copies or substantial portions of the Software.
  
  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
  OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
  HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
  WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
  OTHER DEALINGS IN THE SOFTWARE.
*/
//*****************************************************************

/**
 * \file PacketHeader.cpp
 * \author Juan-Pablo Caceres
 * \date July 2008
 */

#include "PacketHeader.h"
#include "JackTrip.h"

#include <sys/time.h>
#include <cstdlib>
#include <iostream>
#include <stdexcept>

using std::cout; using std::endl;


//#######################################################################
//####################### PacketHeader ##################################
//#######################################################################
//***********************************************************************
00053 PacketHeader::PacketHeader(JackTrip* jacktrip) : 
  mSeqNumber(0), mJackTrip(jacktrip)
{}


//***********************************************************************
00059 uint64_t PacketHeader::usecTime()
{
  struct timeval tv;
  gettimeofday (&tv, NULL);
  return ( (tv.tv_sec * 1000000)  + // seconds
         (tv.tv_usec) );  // plus the microseconds. Type suseconds_t, range [-1, 1000000]
}




//#######################################################################
//####################### DefaultHeader #################################
//#######################################################################
//***********************************************************************
DefaultHeader::DefaultHeader(JackTrip* jacktrip) : 
  PacketHeader(jacktrip), mJackTrip(jacktrip)
{
  mHeader.TimeStamp = 0;
  mHeader.SeqNumber = 0;  
  mHeader.BufferSize = 0; 
  mHeader.SamplingRate = 0;
  mHeader.BitResolution = 0;
  mHeader.NumInChannels = 0;
  mHeader.NumOutChannels = 0;
  //mHeader.Dummy = 0;
}


//***********************************************************************
00089 void DefaultHeader::fillHeaderCommonFromAudio()
{
  mHeader.BufferSize = mJackTrip->getBufferSizeInSamples();
  mHeader.SamplingRate = mJackTrip->getSampleRateType ();
  mHeader.NumInChannels = mJackTrip->getNumInputChannels();
  mHeader.BitResolution = mJackTrip->getAudioBitResolution();
  mHeader.NumOutChannels = mJackTrip->getNumOutputChannels();
  //mHeader.SeqNumber = 0;
  mHeader.TimeStamp = PacketHeader::usecTime();
  //cout << mHeader.TimeStamp << endl;
  //printHeader();
}


//***********************************************************************
00104 void DefaultHeader::checkPeerSettings(int8_t* full_packet)
{
  bool error = false;
  
  DefaultHeaderStruct* peer_header;
  peer_header =  reinterpret_cast<DefaultHeaderStruct*>(full_packet);

  // Check Buffer Size
  if ( peer_header->BufferSize != mHeader.BufferSize ) 
    {
      std::cerr << "ERROR: Peer Buffer Size is  : " << peer_header->BufferSize << endl;
      std::cerr << "       Local Buffer Size is : " << mHeader.BufferSize << endl;
      std::cerr << "Make sure both machines use same buffer size" << endl;
      std::cerr << gPrintSeparator << endl;
      error = true;
    }

  // Check Sampling Rate
  if ( peer_header->SamplingRate != mHeader.SamplingRate ) 
    {
      std::cerr << "ERROR: Peer Sampling Rate is  : " << 
      JackAudioInterface::getSampleRateFromType
      ( static_cast<JackAudioInterface::samplingRateT>(peer_header->SamplingRate) ) << endl;
      std::cerr << "       Local Sampling Rate is  : " << 
      JackAudioInterface::getSampleRateFromType
      ( static_cast<JackAudioInterface::samplingRateT>(mHeader.SamplingRate) ) << endl;
      std::cerr << "Make sure both machines use the same Sampling Rate" << endl;
      std::cerr << gPrintSeparator << endl;
      error = true;
    }

  // Check Audio Bit Resolution
  if ( peer_header->BitResolution != mHeader.BitResolution ) 
    {
      std::cerr << "ERROR: Peer Audio Bit Resolution is  : " 
            << static_cast<int>(peer_header->BitResolution) << endl;
      std::cerr << "       Local Audio Bit Resolution is : "
            << static_cast<int>(mHeader.BitResolution) << endl;
      std::cerr << "Make sure both machines use the same Bit Resolution" << endl;
      std::cerr << gPrintSeparator << endl;
      error = true;
    }

  // Exit program if error
  if (error) 
    {
      //std::cerr << "Exiting program..." << endl;
      //std::exit(1);
      throw std::logic_error("Local and Peer Settings don't match");
    }
  /// \todo Check number of channels and other parameters
}


//***********************************************************************
void DefaultHeader::printHeader() const
{
  cout << "Default Packet Header:" << endl;
  cout << "Buffer Size               = " << static_cast<int>(mHeader.BufferSize) << endl;
  // Get the sample rate in Hz form the JackAudioInterface::samplingRateT
  int sample_rate = 
    JackAudioInterface::getSampleRateFromType
    ( static_cast<JackAudioInterface::samplingRateT>(mHeader.SamplingRate) );
  cout << "Sampling Rate             = " << sample_rate << endl;
  cout << "Audio Bit Resolutions     = " << static_cast<int>(mHeader.BitResolution) << endl;
  cout << "Number of Input Channels  = " << static_cast<int>(mHeader.NumInChannels) << endl;
  cout << "Number of Output Channels = " << static_cast<int>(mHeader.NumOutChannels) << endl;
  cout << "Sequence Number           = " << static_cast<int>(mHeader.SeqNumber) << endl;
  cout << "Time Stamp                = " << mHeader.TimeStamp << endl;
  cout << gPrintSeparator << endl;
  cout << sizeof(mHeader) << endl;
}


//***********************************************************************
uint16_t DefaultHeader::getPeerSequenceNumber(int8_t* full_packet) const
{
  DefaultHeaderStruct* peer_header;
  peer_header =  reinterpret_cast<DefaultHeaderStruct*>(full_packet);
  return peer_header->SeqNumber;
}








//#######################################################################
//####################### JamLinkHeader #################################
//#######################################################################
//***********************************************************************
JamLinkHeader::JamLinkHeader(JackTrip* jacktrip) :
  PacketHeader(jacktrip), mJackTrip(jacktrip)
{
  mHeader.Common = 0;
  mHeader.SeqNumber = 0;
  mHeader.TimeStamp = 0;
}


//***********************************************************************
00207 void JamLinkHeader::fillHeaderCommonFromAudio()
{
  // Check number of channels
  int num_inchannels = mJackTrip->getNumInputChannels();
  if ( num_inchannels != 1 ) {
    //std::cerr << "ERROR: JamLink only support ONE channel. Run JackTrip using only one channel"
    //            << endl;
    //std::exit(1);
    throw std::logic_error("JamLink only support ONE channel. Run JackTrip using only one channel");
  }
  
  // Sampling Rate
  int rate_type = mJackTrip->getSampleRateType();
  if ( rate_type != JackAudioInterface::SR48 ) {
    throw std::logic_error("ERROR: JamLink only support 48kHz for communication with JackTrip at the moment.");
  }

  // Check Buffer Size
  int buf_size = mJackTrip->getBufferSizeInSamples();
  if ( buf_size != 64 )
    {
      throw std::logic_error("ERROR: JamLink only support 64 buffer size for communication with JackTrip at the moment.");
    }

  mHeader.Common = (ETX_MONO | ETX_16BIT | ETX_XTND) + 64;
  switch (rate_type)
    {
    case JackAudioInterface::SR48 :
      mHeader.Common = (mHeader.Common | ETX_48KHZ);
      break;
    case JackAudioInterface::SR44 :
      mHeader.Common = (mHeader.Common | ETX_44KHZ);
      break;
    case JackAudioInterface::SR32 :
      mHeader.Common = (mHeader.Common | ETX_32KHZ);
      break;
    case JackAudioInterface::SR22 :
      mHeader.Common = (mHeader.Common | ETX_22KHZ);
      break;
    default:
      //std::cerr << "ERROR: Sample rate not supported by JamLink" << endl;
      //std::exit(1);
      throw std::out_of_range("Sample rate not supported by JamLink");
      break;
    }
}






//#######################################################################
//####################### EmptyHeader #################################
//#######################################################################
//***********************************************************************
EmptyHeader::EmptyHeader(JackTrip* jacktrip) :
  PacketHeader(jacktrip), mJackTrip(jacktrip)
{}

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