src/PacketHeader.h

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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.
*/
//*****************************************************************

#ifndef __PACKETHEADER_H__
#define __PACKETHEADER_H__

#include <iostream>
#include <tr1/memory> // for shared_ptr
#include <cstring>

#include "jacktrip_types.h"
#include "jacktrip_globals.h"
class JackTrip; // Forward Declaration


struct HeaderStruct{};

struct DefaultHeaderStruct : public HeaderStruct
{
public:
  // watch out for alignment...
  uint64_t TimeStamp; 
  uint16_t SeqNumber; 
  uint16_t BufferSize; 
  uint8_t  SamplingRate; 
  uint8_t BitResolution; 
  uint8_t  NumInChannels; 
  uint8_t  NumOutChannels; 
  //uint8_t  Dummy; ///< Dummy value to byte padding alignment 
};

//---------------------------------------------------------
//JamLink UDP Header:
/************************************************************************/
/* values for the UDP stream type                                       */
/* streamType is a 16-bit value at the head of each UDP stream          */
/* Its bit map is as follows:  (b15-msb)                                */
/* B15:reserved, B14:extended header, B13 Stereo, B12 not 16-bit        */
/* B11-B9: 0-48 Khz, 1-44 Khz, 2-32 Khz, 3-24 Khz,                      */
/*         4-22 Khz, 5-16 Khz, 6-11 Khz, 7-8 Khz                        */      
/* B8-0: Samples in packet                                              */
/************************************************************************/
const unsigned short ETX_RSVD = (0<<15);
const unsigned short ETX_XTND = (1<<14);
const unsigned short ETX_STEREO = (1<<13);
const unsigned short ETX_MONO = (0<<13);
const unsigned short ETX_16BIT = (0<<12);
//inline unsigned short ETX_RATE_MASK(const unsigned short a) { a&(0x7<<9); }
const unsigned short ETX_48KHZ = (0<<9);
const unsigned short ETX_44KHZ = (1<<9);
const unsigned short ETX_32KHZ = (2<<9);
const unsigned short ETX_24KHZ = (3<<9);
const unsigned short ETX_22KHZ = (4<<9);
const unsigned short ETX_16KHZ = (5<<9);
const unsigned short ETX_11KHZ = (6<<9);
const unsigned short ETX_8KHZ  = (7<<9);
// able to express up to 512 SPP
//inline unsigned short  ETX_SPP(const unsigned short a) { (a&0x01FF); }

struct JamLinkHeaderStuct : public HeaderStruct
{
  // watch out for alignment -- need to be on 4 byte chunks
  uint16_t Common; 
  uint16_t SeqNumber; 
  uint32_t TimeStamp; 
};


//#######################################################################
//####################### PacketHeader ##################################
//#######################################################################
class PacketHeader
{
public:
  PacketHeader(JackTrip* jacktrip);
  virtual ~PacketHeader() {}
  
  static uint64_t usecTime();

  virtual void fillHeaderCommonFromAudio() = 0;

  /* \brief Parse the packet header and take appropriate measures (like change settings, or 
   * quit the program if peer settings don't match)
   */
  virtual void parseHeader() = 0;

  virtual void checkPeerSettings(int8_t* full_packet) = 0;
  virtual uint16_t getPeerSequenceNumber(int8_t* full_packet) const = 0;
  virtual uint64_t getPeerTimeStamp(int8_t* full_packet) const = 0;


  /* \brief Increase sequence number for counter, a 16bit number
   */
  virtual void increaseSequenceNumber()
  {
    mSeqNumber++;
  };

  /* \brief Returns the current sequence number
   * \return 16bit Sequence number
   */
  virtual uint16_t getSequenceNumber() const
  {
    return mSeqNumber;
  }

  /* \brief Get the header size in bytes
   */
  virtual int getHeaderSizeInBytes() const = 0;


  virtual void putHeaderInPacketBaseClass(int8_t* full_packet,
                                       const HeaderStruct& header_struct)
  {
    std::memcpy(full_packet, reinterpret_cast<const void*>(&header_struct),
                getHeaderSizeInBytes() );
  };

  /* \brief Put the header in buffer pointed by full_packet
   * \param full_packet Pointer to full packet (audio+header). Size must be
   * sizeof(header part) + sizeof(audio part)
   */
  virtual void putHeaderInPacket(int8_t* full_packet) = 0;

private:
  uint16_t mSeqNumber;
  JackTrip* mJackTrip; 
};




//#######################################################################
//####################### DefaultHeader #################################
//#######################################################################
class DefaultHeader : public PacketHeader
{
public:

  DefaultHeader(JackTrip* jacktrip);
  virtual ~DefaultHeader() {}

  virtual void fillHeaderCommonFromAudio();
  virtual void parseHeader() {}
  virtual void checkPeerSettings(int8_t* full_packet);
  virtual void increaseSequenceNumber()
  {
    mHeader.SeqNumber++;
    //std::cout << "Sequence Number = " << static_cast<int>(mHeader.SeqNumber) << std::endl;
  }
  virtual uint16_t getSequenceNumber() const
  {
    return mHeader.SeqNumber;
  }
  virtual uint16_t getPeerSequenceNumber(int8_t* full_packet) const;
  virtual uint64_t getPeerTimeStamp(int8_t* /*full_packet*/) const
  {  return 0; }
  virtual int getHeaderSizeInBytes() const { return sizeof(mHeader); }
  virtual void putHeaderInPacket(int8_t* full_packet)
  {
    putHeaderInPacketBaseClass(full_packet, mHeader);
    //std::memcpy(full_packet, reinterpret_cast<const void*>(&mHeader),
    //  getHeaderSizeInBytes() );
  }
  void printHeader() const;

private:
  //DefaultHeaderStruct mHeader; ///< Header Struct
  DefaultHeaderStruct mHeader;
  JackTrip* mJackTrip; 
};




//#######################################################################
//####################### JamLinkHeader #################################
//#######################################################################

class JamLinkHeader : public PacketHeader
{
public:
  
  JamLinkHeader(JackTrip* jacktrip);
  virtual ~JamLinkHeader() {}

  virtual void fillHeaderCommonFromAudio();
  virtual void parseHeader() {}
  virtual void checkPeerSettings(int8_t* /*full_packet*/) {}
  virtual uint16_t getPeerSequenceNumber(int8_t* /*full_packet*/) const
  {  return 0; }
  virtual uint64_t getPeerTimeStamp(int8_t* /*full_packet*/) const
  {  return 0; }
  virtual void increaseSequenceNumber() {}
  virtual int getHeaderSizeInBytes() const { return sizeof(mHeader); }
  virtual void putHeaderInPacket(int8_t* full_packet)
  {
    putHeaderInPacketBaseClass(full_packet, mHeader);
  };

private:
  JamLinkHeaderStuct mHeader; 
  JackTrip* mJackTrip; 
};



//#######################################################################
//####################### EmptyHeader #################################
//#######################################################################

class EmptyHeader : public PacketHeader
{
public:
  
  EmptyHeader(JackTrip* jacktrip);
  virtual ~EmptyHeader() {}

  virtual void fillHeaderCommonFromAudio() {}
  virtual void parseHeader() {}
  virtual void checkPeerSettings(int8_t* /*full_packet*/) {}
  virtual uint16_t getPeerSequenceNumber(int8_t* /*full_packet*/) const
  { return 0; }
  virtual uint64_t getPeerTimeStamp(int8_t* /*full_packet*/) const
  { return 0; }
  virtual void increaseSequenceNumber() {}
  virtual int getHeaderSizeInBytes() const { return 0; }
  virtual void putHeaderInPacket(int8_t* /*full_packet*/) {}

private:
  JackTrip* mJackTrip; 
};


#endif //__PACKETHEADER_H__

 

Documentation generated by Doxygen 1.5.6 on Tue Jul 21 19:04:32 2009

© 2008 by Juan-Pablo Caceres (jcaceres at ccrma dot stanford dot edu) and Chris Chafe
SoundWIRE Group at CCRMA - Stanford University