Wrapper Library for Windows MIDI API

/*

  ShortMsg.cpp

  Implementation for the CShortMsg class

      Copyright (c) 2008 Leslie Sanford

    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.

    Contact: Leslie Sanford (jabberdabber@hotmail.com)

    Last modified: 01/23/2008

*/


//---------------------------------------------------------------------
// Dependencies
//---------------------------------------------------------------------


#include "midi.h"
#include "ShortMsg.h"
#include "MIDIOutDevice.h"
#include "MIDIInDevice.h"


// Using declaration
using midi::CShortMsg;


//---------------------------------------------------------------------
// CShortMsg implementation
//---------------------------------------------------------------------


// Constructor
CShortMsg::CShortMsg(DWORD TimeStamp) :
m_Msg(0),
m_MsgNoStatus(0)
{
    SetTimeStamp(TimeStamp);
}


// Constructor
CShortMsg::CShortMsg(DWORD Msg, DWORD TimeStamp) : 
m_Msg(Msg)
{
    unsigned char DataByte1 = GetData1();
    unsigned char DataByte2 = GetData2();

    m_MsgNoStatus = PackShortMsg(DataByte1, DataByte2);

    SetTimeStamp(TimeStamp);
}


// Constructor
CShortMsg::CShortMsg(unsigned char Status, unsigned char Data1, 
                     unsigned char Data2, DWORD TimeStamp)
{
    SetMsg(Status, Data1, Data2);
    m_MsgNoStatus = PackShortMsg(Data1, Data2);

    SetTimeStamp(TimeStamp);
}


// Constructor
CShortMsg::CShortMsg(unsigned char Command, unsigned char Channel, 
                     unsigned char Data1, unsigned char Data2,
                     DWORD TimeStamp)
{
    SetMsg(Command, Channel, Data1, Data2);
    m_MsgNoStatus = PackShortMsg(Data1, Data2);

    SetTimeStamp(TimeStamp);
}


// Sends message
void CShortMsg::SendMsg(midi::CMIDIOutDevice &OutDevice)
{
    OutDevice.SendMsg(m_Msg);
}


// Sends message without status byte
void CShortMsg::SendMsgNoStatus(midi::CMIDIOutDevice &OutDevice)
{
    OutDevice.SendMsg(m_MsgNoStatus);
}


// Gets message
const char *CShortMsg::GetMsg() const
{
    return reinterpret_cast<const char *>(&m_Msg);
}


// Gets status byte
unsigned char CShortMsg::GetStatus() const
{
    unsigned char Status;
    unsigned char Dummy;

    UnpackShortMsg(m_Msg, Status, Dummy, Dummy);

    return Status;
}


// Gets MIDI channel
unsigned char CShortMsg::GetChannel() const
{
    unsigned char Channel;
    unsigned char Dummy;

    UnpackShortMsg(m_Msg, Dummy, Channel, Dummy, Dummy);

    return Channel;
}


// Gets command code
unsigned char CShortMsg::GetCommand() const
{
    unsigned char Command;
    unsigned char Dummy;

    UnpackShortMsg(m_Msg, Command, Dummy, Dummy, Dummy);

    return Command;
}


// Gets data byte 1
unsigned char CShortMsg::GetData1() const
{
    unsigned char Data1;
    unsigned char Dummy;

    UnpackShortMsg(m_Msg, Dummy, Dummy, Data1, Dummy);

    return Data1;
}


// Gets data byte 2
unsigned char CShortMsg::GetData2() const
{
    unsigned char Data2;
    unsigned char Dummy;

    UnpackShortMsg(m_Msg, Dummy, Dummy, Dummy, Data2);

    return Data2;
}


// Sets message
void CShortMsg::SetMsg(unsigned char Status, unsigned char Data1,
                       unsigned char Data2)
{
    m_Msg = PackShortMsg(Status, Data1, Data2);
    m_MsgNoStatus = PackShortMsg(Data1, Data2);
}


// Sets message
void CShortMsg::SetMsg(unsigned char Command, unsigned char Channel,
                       unsigned char Data1, unsigned char Data2)
{
    m_Msg = PackShortMsg(Command, Channel, Data1, Data2);
    m_MsgNoStatus = PackShortMsg(Data1, Data2);
}


// Packs data into short message without status byte
DWORD CShortMsg::PackShortMsg(unsigned char DataByte1,
                              unsigned char DataByte2)
{
    DWORD Msg = DataByte1;
    Msg |= DataByte2 << midi::SHORT_MSG_SHIFT;

    return Msg;
}


// Packs data into short message with status byte
DWORD CShortMsg::PackShortMsg(unsigned char Status,
                              unsigned char DataByte1,
                              unsigned char DataByte2)
{
    DWORD Msg = Status;
    Msg |= DataByte1 << midi::SHORT_MSG_SHIFT;
    Msg |= DataByte2 << midi::SHORT_MSG_SHIFT * 2;

    return Msg;
}


// Packs data into short channel message
DWORD CShortMsg::PackShortMsg(unsigned char Command,
                              unsigned char Channel,
                              unsigned char DataByte1,
                              unsigned char DataByte2)
{
    DWORD Msg = Command | Channel;
    Msg |= DataByte1 << midi::SHORT_MSG_SHIFT;
    Msg |= DataByte2 << midi::SHORT_MSG_SHIFT * 2;

    return Msg;
}


// Unpacks short message
void CShortMsg::UnpackShortMsg(DWORD Msg, unsigned char &Status,
                               unsigned char &DataByte1,
                               unsigned char &DataByte2)
{
    Status = static_cast<unsigned char>(Msg);
    DataByte1 = static_cast<unsigned char>
                                   (Msg >> midi::SHORT_MSG_SHIFT);
    DataByte2 = static_cast<unsigned char>
                                   (Msg >> midi::SHORT_MSG_SHIFT * 2);
}


// Unpacks short channel message
void CShortMsg::UnpackShortMsg(DWORD Msg, unsigned char &Command,
                               unsigned char &Channel,
                               unsigned char &DataByte1,
                               unsigned char &DataByte2)
{
    Command = static_cast<unsigned char>(Msg & ~midi::SHORT_MSG_MASK);
    Channel = static_cast<unsigned char>(Msg & midi::SHORT_MSG_MASK);
    DataByte1 = static_cast<unsigned char>
                                   (Msg >> midi::SHORT_MSG_SHIFT);
    DataByte2 = static_cast<unsigned char>
                                   (Msg >> midi::SHORT_MSG_SHIFT * 2);
}