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+/**********************************************************************/
+/*! \class RtMidi
+    \brief An abstract base class for realtime MIDI input/output.
+
+    This class implements some common functionality for the realtime
+    MIDI input/output subclasses RtMidiIn and RtMidiOut.
+
+    RtMidi WWW site: http://music.mcgill.ca/~gary/rtmidi/
+
+    RtMidi: realtime MIDI i/o C++ classes
+    Copyright (c) 2003-2004 Gary P. Scavone
+
+    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.
+
+    Any person wishing to distribute modifications to the Software is
+    requested to send the modifications to the original developer so that
+    they can be incorporated into the canonical version.
+
+    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.
+*/
+/**********************************************************************/
+
+// RtMidi: Version 1.0.0, 17 September 2004
+
+#ifndef RTMIDI_H
+#define RTMIDI_H
+
+#include "RtError.h"
+#include <string>
+
+class RtMidi
+{
+ protected:
+
+  RtMidi();
+
+  virtual ~RtMidi() {};
+
+  // A basic error reporting function for internal use in the RtMidi
+  // subclasses.  The behavior of this function can be modified to
+  // suit specific needs.
+  void error( RtError::Type type );
+
+  virtual void openPort( unsigned int portNumber = 0 ) = 0;
+
+  void *apiData_;
+  bool connected_;
+  std::string errorString_;
+};
+
+/**********************************************************************/
+/*! \class RtMidiIn
+    \brief A realtime MIDI input class.
+
+    This class provides a common, platform-independent API for
+    realtime MIDI input.  It allows access to a single MIDI input
+    port.  Incoming MIDI messages are either saved to a queue for
+    retrieval using the getMessage() function or immediately passed to
+    a user-specified callback function.  Create multiple instances of
+    this class to connect to more than one MIDI device at the same
+    time.  With the OS-X and Linux ALSA MIDI APIs, it is also possible
+    to open a virtual input port to which other MIDI software clients
+    can connect.
+
+    by Gary P. Scavone, 2003-2004.
+*/
+/**********************************************************************/
+
+#include <vector>
+#include <queue>
+
+class RtMidiIn : public RtMidi
+{
+ public:
+
+  //! User callback function type definition.
+  typedef void (*RtMidiCallback)( double timeStamp, std::vector<unsigned char> *message, void *userData);
+
+  //! Default constructor.
+  /*!
+      An exception will be thrown if a MIDI system initialization error occurs.
+  */
+  RtMidiIn();
+
+  //! If a MIDI connection is still open, it will be closed by the destructor.
+  ~RtMidiIn();
+
+  //! Open a MIDI input connection.
+  /*!
+      An optional port number greater than 0 can be specified.
+      Otherwise, the default or first port found is opened.
+  */
+  void openPort( unsigned int portNumber = 0 );
+
+  //! Create a virtual input port to allow software connections (OS X and ALSA only).
+  /*!
+      This function creates a virtual MIDI input port to which other
+      software applications can connect.  This type of functionality
+      is currently only supported by the Macintosh OS-X and Linux ALSA
+      APIs (the function does nothing for the other APIs).
+  */
+  void openVirtualPort();
+
+  //! Set a callback function to be invoked for incoming MIDI messages.
+  /*!
+      The callback function will be called whenever an incoming MIDI
+      message is received.  While not absolutely necessary, it is best
+      to set the callback function before opening a MIDI port to avoid
+      leaving some messages in the queue.
+  */
+  void setCallback( RtMidiCallback callback, void *userData = 0 );
+
+  //! Cancel use of the current callback function (if one exists).
+  /*!
+      Subsequent incoming MIDI messages will be written to the queue
+      and can be retrieved with the \e getMessage function.
+  */
+  void cancelCallback();
+
+  //! Close an open MIDI connection (if one exists).
+  void closePort( void );
+
+  //! Return the number of available MIDI input ports.
+  unsigned int getPortCount();
+
+  //! Return a string identifier for the specified MIDI input port number.
+  /*!
+      An exception is thrown if an invalid port specifier is provided.
+  */
+  std::string getPortName( unsigned int portNumber = 0 );
+
+  //! Set the maximum number of MIDI messages to be saved in the queue.
+  /*!
+      If the queue size limit is reached, incoming messages will be
+      ignored.  The default limit is 1024.
+  */
+  void setQueueSizeLimit( unsigned int queueSize );
+
+  //! Specify whether certain MIDI message types should be queued or ignored during input.
+  /*!
+      By default, MIDI timing and active sensing messages are ignored
+      during message input because of their relative high data rates.
+      MIDI sysex messages are ignored by default as well.  Variable
+      values of "true" imply that the respective message type will be
+      ignored.
+  */
+  void ignoreTypes( bool midiSysex = true, bool midiTime = true, bool midiSense = true );
+
+  //! Fill the user-provided vector with the data bytes for the next available MIDI message in the input queue and return the event delta-time in seconds.
+  /*!
+      This function returns immediately whether a new message is
+      available or not.  A valid message is indicated by a non-zero
+      vector size.  An exception is thrown if an error occurs during
+      message retrieval or an input connection was not previously
+      established.
+  */
+  double getMessage( std::vector<unsigned char> *message );
+
+  // A MIDI structure used internally by the class to store incoming
+  // messages.  Each message represents one and only one MIDI message.
+  struct MidiMessage { 
+    std::vector<unsigned char> bytes; 
+    double timeStamp;
+
+    // Default constructor.
+    MidiMessage()
+      :bytes(3), timeStamp(0.0) {}
+  };
+
+  // The RtMidiInData structure is used to pass private class data to
+  // the MIDI input handling function or thread.
+  struct RtMidiInData {
+    std::queue<MidiMessage> queue;
+    unsigned int queueLimit;
+    unsigned char ignoreFlags;
+    bool doInput;
+    bool firstMessage;
+    void *apiData;
+    bool usingCallback;
+    void *userCallback;
+    void *userData;
+
+    // Default constructor.
+    RtMidiInData()
+      : queueLimit(1024), ignoreFlags(7), doInput(false), firstMessage(true),
+        apiData(0), usingCallback(false), userCallback(0), userData(0) {}
+  };
+
+ private:
+
+  void initialize( void );
+  RtMidiInData inputData_;
+
+};
+
+/**********************************************************************/
+/*! \class RtMidiOut
+    \brief A realtime MIDI output class.
+
+    This class provides a common, platform-independent API for MIDI
+    output.  It allows one to probe available MIDI output ports, to
+    connect to one such port, and to send MIDI bytes immediately over
+    the connection.  Create multiple instances of this class to
+    connect to more than one MIDI device at the same time.
+
+    by Gary P. Scavone, 2003-2004.
+*/
+/**********************************************************************/
+
+class RtMidiOut : public RtMidi
+{
+ public:
+
+  //! Default constructor.
+  /*!
+      An exception will be thrown if a MIDI system initialization error occurs.
+  */
+  RtMidiOut();
+
+  //! The destructor closes any open MIDI connections.
+  ~RtMidiOut();
+
+  //! Open a MIDI output connection.
+  /*!
+      An optional port number greater than 0 can be specified.
+      Otherwise, the default or first port found is opened.  An
+      exception is thrown if an error occurs while attempting to make
+      the port connection.
+  */
+  void openPort( unsigned int portNumber = 0 );
+
+  //! Close an open MIDI connection (if one exists).
+  void closePort();
+
+  //! Create a virtual output port to allow software connections (OS X and ALSA only).
+  /*!
+      This function creates a virtual MIDI output port to which other
+      software applications can connect.  This type of functionality
+      is currently only supported by the Macintosh OS-X and Linux ALSA
+      APIs (the function does nothing with the other APIs).  An
+      exception is thrown if an error occurs while attempting to create
+      the virtual port.
+  */
+  void openVirtualPort();
+
+  //! Return the number of available MIDI output ports.
+  unsigned int getPortCount();
+
+  //! Return a string identifier for the specified MIDI port type and number.
+  /*!
+      An exception is thrown if an invalid port specifier is provided.
+  */
+  std::string getPortName( unsigned int portNumber );
+
+  //! Immediately send a single message out an open MIDI output port.
+  /*!
+      An exception is thrown if an error occurs during output or an
+      output connection was not previously established.
+  */
+  void sendMessage( std::vector<unsigned char> *message );
+
+ private:
+
+  void initialize( void );
+};
+
+#endif