diff CollidoscopeApp/src/RtMidi.cpp @ 0:02467299402e

First import

CollidoscopeApp for Raspberry Pi
JackDevice
Teensy code for Collidoscope

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/CollidoscopeApp/src/RtMidi.cpp	Thu Jun 30 14:50:06 2016 +0200
@@ -0,0 +1,2839 @@
+/**********************************************************************/
+/*! \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) 2003-2016 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
+    asked to send the modifications to the original developer so that
+    they can be incorporated into the canonical version.  This is,
+    however, not a binding provision of this license.
+
+    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.
+*/
+/**********************************************************************/
+
+#include "RtMidi.h"
+#include <sstream>
+
+#if defined(__MACOSX_CORE__)
+  #if TARGET_OS_IPHONE
+    #define AudioGetCurrentHostTime CAHostTimeBase::GetCurrentTime
+    #define AudioConvertHostTimeToNanos CAHostTimeBase::ConvertToNanos
+  #endif
+#endif
+
+//*********************************************************************//
+//  RtMidi Definitions
+//*********************************************************************//
+
+RtMidi :: RtMidi()
+  : rtapi_(0)
+{
+}
+
+RtMidi :: ~RtMidi()
+{
+  if ( rtapi_ )
+    delete rtapi_;
+  rtapi_ = 0;
+}
+
+std::string RtMidi :: getVersion( void ) throw()
+{
+  return std::string( RTMIDI_VERSION );
+}
+
+void RtMidi :: getCompiledApi( std::vector<RtMidi::Api> &apis ) throw()
+{
+  apis.clear();
+
+  // The order here will control the order of RtMidi's API search in
+  // the constructor.
+#if defined(__MACOSX_CORE__)
+  apis.push_back( MACOSX_CORE );
+#endif
+#if defined(__LINUX_ALSA__)
+  apis.push_back( LINUX_ALSA );
+#endif
+#if defined(__UNIX_JACK__)
+  apis.push_back( UNIX_JACK );
+#endif
+#if defined(__WINDOWS_MM__)
+  apis.push_back( WINDOWS_MM );
+#endif
+#if defined(__RTMIDI_DUMMY__)
+  apis.push_back( RTMIDI_DUMMY );
+#endif
+}
+
+//*********************************************************************//
+//  RtMidiIn Definitions
+//*********************************************************************//
+
+void RtMidiIn :: openMidiApi( RtMidi::Api api, const std::string clientName, unsigned int queueSizeLimit )
+{
+  if ( rtapi_ )
+    delete rtapi_;
+  rtapi_ = 0;
+
+#if defined(__UNIX_JACK__)
+  if ( api == UNIX_JACK )
+    rtapi_ = new MidiInJack( clientName, queueSizeLimit );
+#endif
+#if defined(__LINUX_ALSA__)
+  if ( api == LINUX_ALSA )
+    rtapi_ = new MidiInAlsa( clientName, queueSizeLimit );
+#endif
+#if defined(__WINDOWS_MM__)
+  if ( api == WINDOWS_MM )
+    rtapi_ = new MidiInWinMM( clientName, queueSizeLimit );
+#endif
+#if defined(__MACOSX_CORE__)
+  if ( api == MACOSX_CORE )
+    rtapi_ = new MidiInCore( clientName, queueSizeLimit );
+#endif
+#if defined(__RTMIDI_DUMMY__)
+  if ( api == RTMIDI_DUMMY )
+    rtapi_ = new MidiInDummy( clientName, queueSizeLimit );
+#endif
+}
+
+RtMidiIn :: RtMidiIn( RtMidi::Api api, const std::string clientName, unsigned int queueSizeLimit )
+  : RtMidi()
+{
+  if ( api != UNSPECIFIED ) {
+    // Attempt to open the specified API.
+    openMidiApi( api, clientName, queueSizeLimit );
+    if ( rtapi_ ) return;
+
+    // No compiled support for specified API value.  Issue a warning
+    // and continue as if no API was specified.
+    std::cerr << "\nRtMidiIn: no compiled support for specified API argument!\n\n" << std::endl;
+  }
+
+  // Iterate through the compiled APIs and return as soon as we find
+  // one with at least one port or we reach the end of the list.
+  std::vector< RtMidi::Api > apis;
+  getCompiledApi( apis );
+  for ( unsigned int i=0; i<apis.size(); i++ ) {
+    openMidiApi( apis[i], clientName, queueSizeLimit );
+    if ( rtapi_->getPortCount() ) break;
+  }
+
+  if ( rtapi_ ) return;
+
+  // It should not be possible to get here because the preprocessor
+  // definition __RTMIDI_DUMMY__ is automatically defined if no
+  // API-specific definitions are passed to the compiler. But just in
+  // case something weird happens, we'll throw an error.
+  std::string errorText = "RtMidiIn: no compiled API support found ... critical error!!";
+  throw( RtMidiError( errorText, RtMidiError::UNSPECIFIED ) );
+}
+
+RtMidiIn :: ~RtMidiIn() throw()
+{
+}
+
+
+//*********************************************************************//
+//  RtMidiOut Definitions
+//*********************************************************************//
+
+void RtMidiOut :: openMidiApi( RtMidi::Api api, const std::string clientName )
+{
+  if ( rtapi_ )
+    delete rtapi_;
+  rtapi_ = 0;
+
+#if defined(__UNIX_JACK__)
+  if ( api == UNIX_JACK )
+    rtapi_ = new MidiOutJack( clientName );
+#endif
+#if defined(__LINUX_ALSA__)
+  if ( api == LINUX_ALSA )
+    rtapi_ = new MidiOutAlsa( clientName );
+#endif
+#if defined(__WINDOWS_MM__)
+  if ( api == WINDOWS_MM )
+    rtapi_ = new MidiOutWinMM( clientName );
+#endif
+#if defined(__MACOSX_CORE__)
+  if ( api == MACOSX_CORE )
+    rtapi_ = new MidiOutCore( clientName );
+#endif
+#if defined(__RTMIDI_DUMMY__)
+  if ( api == RTMIDI_DUMMY )
+    rtapi_ = new MidiOutDummy( clientName );
+#endif
+}
+
+RtMidiOut :: RtMidiOut( RtMidi::Api api, const std::string clientName )
+{
+  if ( api != UNSPECIFIED ) {
+    // Attempt to open the specified API.
+    openMidiApi( api, clientName );
+    if ( rtapi_ ) return;
+
+    // No compiled support for specified API value.  Issue a warning
+    // and continue as if no API was specified.
+    std::cerr << "\nRtMidiOut: no compiled support for specified API argument!\n\n" << std::endl;
+  }
+
+  // Iterate through the compiled APIs and return as soon as we find
+  // one with at least one port or we reach the end of the list.
+  std::vector< RtMidi::Api > apis;
+  getCompiledApi( apis );
+  for ( unsigned int i=0; i<apis.size(); i++ ) {
+    openMidiApi( apis[i], clientName );
+    if ( rtapi_->getPortCount() ) break;
+  }
+
+  if ( rtapi_ ) return;
+
+  // It should not be possible to get here because the preprocessor
+  // definition __RTMIDI_DUMMY__ is automatically defined if no
+  // API-specific definitions are passed to the compiler. But just in
+  // case something weird happens, we'll thrown an error.
+  std::string errorText = "RtMidiOut: no compiled API support found ... critical error!!";
+  throw( RtMidiError( errorText, RtMidiError::UNSPECIFIED ) );
+}
+
+RtMidiOut :: ~RtMidiOut() throw()
+{
+}
+
+//*********************************************************************//
+//  Common MidiApi Definitions
+//*********************************************************************//
+
+MidiApi :: MidiApi( void )
+  : apiData_( 0 ), connected_( false ), errorCallback_(0), errorCallbackUserData_(0)
+{
+}
+
+MidiApi :: ~MidiApi( void )
+{
+}
+
+void MidiApi :: setErrorCallback( RtMidiErrorCallback errorCallback, void *userData = 0 )
+{
+    errorCallback_ = errorCallback;
+    errorCallbackUserData_ = userData;
+}
+
+void MidiApi :: error( RtMidiError::Type type, std::string errorString )
+{
+  if ( errorCallback_ ) {
+
+    if ( firstErrorOccurred_ )
+      return;
+
+    firstErrorOccurred_ = true;
+    const std::string errorMessage = errorString;
+
+    errorCallback_( type, errorMessage, errorCallbackUserData_);
+    firstErrorOccurred_ = false;
+    return;
+  }
+
+  if ( type == RtMidiError::WARNING ) {
+    std::cerr << '\n' << errorString << "\n\n";
+  }
+  else if ( type == RtMidiError::DEBUG_WARNING ) {
+#if defined(__RTMIDI_DEBUG__)
+    std::cerr << '\n' << errorString << "\n\n";
+#endif
+  }
+  else {
+    std::cerr << '\n' << errorString << "\n\n";
+    throw RtMidiError( errorString, type );
+  }
+}
+
+//*********************************************************************//
+//  Common MidiInApi Definitions
+//*********************************************************************//
+
+MidiInApi :: MidiInApi( unsigned int queueSizeLimit )
+  : MidiApi()
+{
+  // Allocate the MIDI queue.
+  inputData_.queue.ringSize = queueSizeLimit;
+  if ( inputData_.queue.ringSize > 0 )
+    inputData_.queue.ring = new MidiMessage[ inputData_.queue.ringSize ];
+}
+
+MidiInApi :: ~MidiInApi( void )
+{
+  // Delete the MIDI queue.
+  if ( inputData_.queue.ringSize > 0 ) delete [] inputData_.queue.ring;
+}
+
+void MidiInApi :: setCallback( RtMidiIn::RtMidiCallback callback, void *userData )
+{
+  if ( inputData_.usingCallback ) {
+    errorString_ = "MidiInApi::setCallback: a callback function is already set!";
+    error( RtMidiError::WARNING, errorString_ );
+    return;
+  }
+
+  if ( !callback ) {
+    errorString_ = "RtMidiIn::setCallback: callback function value is invalid!";
+    error( RtMidiError::WARNING, errorString_ );
+    return;
+  }
+
+  inputData_.userCallback = callback;
+  inputData_.userData = userData;
+  inputData_.usingCallback = true;
+}
+
+void MidiInApi :: cancelCallback()
+{
+  if ( !inputData_.usingCallback ) {
+    errorString_ = "RtMidiIn::cancelCallback: no callback function was set!";
+    error( RtMidiError::WARNING, errorString_ );
+    return;
+  }
+
+  inputData_.userCallback = 0;
+  inputData_.userData = 0;
+  inputData_.usingCallback = false;
+}
+
+void MidiInApi :: ignoreTypes( bool midiSysex, bool midiTime, bool midiSense )
+{
+  inputData_.ignoreFlags = 0;
+  if ( midiSysex ) inputData_.ignoreFlags = 0x01;
+  if ( midiTime ) inputData_.ignoreFlags |= 0x02;
+  if ( midiSense ) inputData_.ignoreFlags |= 0x04;
+}
+
+double MidiInApi :: getMessage( std::vector<unsigned char> *message )
+{
+  message->clear();
+
+  if ( inputData_.usingCallback ) {
+    errorString_ = "RtMidiIn::getNextMessage: a user callback is currently set for this port.";
+    error( RtMidiError::WARNING, errorString_ );
+    return 0.0;
+  }
+
+  if ( inputData_.queue.size == 0 ) return 0.0;
+
+  // Copy queued message to the vector pointer argument and then "pop" it.
+  std::vector<unsigned char> *bytes = &(inputData_.queue.ring[inputData_.queue.front].bytes);
+  message->assign( bytes->begin(), bytes->end() );
+  double deltaTime = inputData_.queue.ring[inputData_.queue.front].timeStamp;
+  inputData_.queue.size--;
+  inputData_.queue.front++;
+  if ( inputData_.queue.front == inputData_.queue.ringSize )
+    inputData_.queue.front = 0;
+
+  return deltaTime;
+}
+
+//*********************************************************************//
+//  Common MidiOutApi Definitions
+//*********************************************************************//
+
+MidiOutApi :: MidiOutApi( void )
+  : MidiApi()
+{
+}
+
+MidiOutApi :: ~MidiOutApi( void )
+{
+}
+
+// *************************************************** //
+//
+// OS/API-specific methods.
+//
+// *************************************************** //
+
+#if defined(__MACOSX_CORE__)
+
+// The CoreMIDI API is based on the use of a callback function for
+// MIDI input.  We convert the system specific time stamps to delta
+// time values.
+
+// OS-X CoreMIDI header files.
+#include <CoreMIDI/CoreMIDI.h>
+#include <CoreAudio/HostTime.h>
+#include <CoreServices/CoreServices.h>
+
+// A structure to hold variables related to the CoreMIDI API
+// implementation.
+struct CoreMidiData {
+  MIDIClientRef client;
+  MIDIPortRef port;
+  MIDIEndpointRef endpoint;
+  MIDIEndpointRef destinationId;
+  unsigned long long lastTime;
+  MIDISysexSendRequest sysexreq;
+};
+
+//*********************************************************************//
+//  API: OS-X
+//  Class Definitions: MidiInCore
+//*********************************************************************//
+
+static void midiInputCallback( const MIDIPacketList *list, void *procRef, void */*srcRef*/ )
+{
+  MidiInApi::RtMidiInData *data = static_cast<MidiInApi::RtMidiInData *> (procRef);
+  CoreMidiData *apiData = static_cast<CoreMidiData *> (data->apiData);
+
+  unsigned char status;
+  unsigned short nBytes, iByte, size;
+  unsigned long long time;
+
+  bool& continueSysex = data->continueSysex;
+  MidiInApi::MidiMessage& message = data->message;
+
+  const MIDIPacket *packet = &list->packet[0];
+  for ( unsigned int i=0; i<list->numPackets; ++i ) {
+
+    // My interpretation of the CoreMIDI documentation: all message
+    // types, except sysex, are complete within a packet and there may
+    // be several of them in a single packet.  Sysex messages can be
+    // broken across multiple packets and PacketLists but are bundled
+    // alone within each packet (these packets do not contain other
+    // message types).  If sysex messages are split across multiple
+    // MIDIPacketLists, they must be handled by multiple calls to this
+    // function.
+
+    nBytes = packet->length;
+    if ( nBytes == 0 ) continue;
+
+    // Calculate time stamp.
+
+    if ( data->firstMessage ) {
+      message.timeStamp = 0.0;
+      data->firstMessage = false;
+    }
+    else {
+      time = packet->timeStamp;
+      if ( time == 0 ) { // this happens when receiving asynchronous sysex messages
+        time = AudioGetCurrentHostTime();
+      }
+      time -= apiData->lastTime;
+      time = AudioConvertHostTimeToNanos( time );
+      if ( !continueSysex )
+        message.timeStamp = time * 0.000000001;
+    }
+    apiData->lastTime = packet->timeStamp;
+    if ( apiData->lastTime == 0 ) { // this happens when receiving asynchronous sysex messages
+      apiData->lastTime = AudioGetCurrentHostTime();
+    }
+    //std::cout << "TimeStamp = " << packet->timeStamp << std::endl;
+
+    iByte = 0;
+    if ( continueSysex ) {
+      // We have a continuing, segmented sysex message.
+      if ( !( data->ignoreFlags & 0x01 ) ) {
+        // If we're not ignoring sysex messages, copy the entire packet.
+        for ( unsigned int j=0; j<nBytes; ++j )
+          message.bytes.push_back( packet->data[j] );
+      }
+      continueSysex = packet->data[nBytes-1] != 0xF7;
+
+      if ( !( data->ignoreFlags & 0x01 ) && !continueSysex ) {
+        // If not a continuing sysex message, invoke the user callback function or queue the message.
+        if ( data->usingCallback ) {
+          RtMidiIn::RtMidiCallback callback = (RtMidiIn::RtMidiCallback) data->userCallback;
+          callback( message.timeStamp, &message.bytes, data->userData );
+        }
+        else {
+          // As long as we haven't reached our queue size limit, push the message.
+          if ( data->queue.size < data->queue.ringSize ) {
+            data->queue.ring[data->queue.back++] = message;
+            if ( data->queue.back == data->queue.ringSize )
+              data->queue.back = 0;
+            data->queue.size++;
+          }
+          else
+            std::cerr << "\nMidiInCore: message queue limit reached!!\n\n";
+        }
+        message.bytes.clear();
+      }
+    }
+    else {
+      while ( iByte < nBytes ) {
+        size = 0;
+        // We are expecting that the next byte in the packet is a status byte.
+        status = packet->data[iByte];
+        if ( !(status & 0x80) ) break;
+        // Determine the number of bytes in the MIDI message.
+        if ( status < 0xC0 ) size = 3;
+        else if ( status < 0xE0 ) size = 2;
+        else if ( status < 0xF0 ) size = 3;
+        else if ( status == 0xF0 ) {
+          // A MIDI sysex
+          if ( data->ignoreFlags & 0x01 ) {
+            size = 0;
+            iByte = nBytes;
+          }
+          else size = nBytes - iByte;
+          continueSysex = packet->data[nBytes-1] != 0xF7;
+        }
+        else if ( status == 0xF1 ) {
+            // A MIDI time code message
+           if ( data->ignoreFlags & 0x02 ) {
+            size = 0;
+            iByte += 2;
+           }
+           else size = 2;
+        }
+        else if ( status == 0xF2 ) size = 3;
+        else if ( status == 0xF3 ) size = 2;
+        else if ( status == 0xF8 && ( data->ignoreFlags & 0x02 ) ) {
+          // A MIDI timing tick message and we're ignoring it.
+          size = 0;
+          iByte += 1;
+        }
+        else if ( status == 0xFE && ( data->ignoreFlags & 0x04 ) ) {
+          // A MIDI active sensing message and we're ignoring it.
+          size = 0;
+          iByte += 1;
+        }
+        else size = 1;
+
+        // Copy the MIDI data to our vector.
+        if ( size ) {
+          message.bytes.assign( &packet->data[iByte], &packet->data[iByte+size] );
+          if ( !continueSysex ) {
+            // If not a continuing sysex message, invoke the user callback function or queue the message.
+            if ( data->usingCallback ) {
+              RtMidiIn::RtMidiCallback callback = (RtMidiIn::RtMidiCallback) data->userCallback;
+              callback( message.timeStamp, &message.bytes, data->userData );
+            }
+            else {
+              // As long as we haven't reached our queue size limit, push the message.
+              if ( data->queue.size < data->queue.ringSize ) {
+                data->queue.ring[data->queue.back++] = message;
+                if ( data->queue.back == data->queue.ringSize )
+                  data->queue.back = 0;
+                data->queue.size++;
+              }
+              else
+                std::cerr << "\nMidiInCore: message queue limit reached!!\n\n";
+            }
+            message.bytes.clear();
+          }
+          iByte += size;
+        }
+      }
+    }
+    packet = MIDIPacketNext(packet);
+  }
+}
+
+MidiInCore :: MidiInCore( const std::string clientName, unsigned int queueSizeLimit ) : MidiInApi( queueSizeLimit )
+{
+  initialize( clientName );
+}
+
+MidiInCore :: ~MidiInCore( void )
+{
+  // Close a connection if it exists.
+  closePort();
+
+  // Cleanup.
+  CoreMidiData *data = static_cast<CoreMidiData *> (apiData_);
+  MIDIClientDispose( data->client );
+  if ( data->endpoint ) MIDIEndpointDispose( data->endpoint );
+  delete data;
+}
+
+void MidiInCore :: initialize( const std::string& clientName )
+{
+  // Set up our client.
+  MIDIClientRef client;
+  CFStringRef name = CFStringCreateWithCString( NULL, clientName.c_str(), kCFStringEncodingASCII );
+  OSStatus result = MIDIClientCreate(name, NULL, NULL, &client );
+  if ( result != noErr ) {
+    errorString_ = "MidiInCore::initialize: error creating OS-X MIDI client object.";
+    error( RtMidiError::DRIVER_ERROR, errorString_ );
+    return;
+  }
+
+  // Save our api-specific connection information.
+  CoreMidiData *data = (CoreMidiData *) new CoreMidiData;
+  data->client = client;
+  data->endpoint = 0;
+  apiData_ = (void *) data;
+  inputData_.apiData = (void *) data;
+  CFRelease(name);
+}
+
+void MidiInCore :: openPort( unsigned int portNumber, const std::string portName )
+{
+  if ( connected_ ) {
+    errorString_ = "MidiInCore::openPort: a valid connection already exists!";
+    error( RtMidiError::WARNING, errorString_ );
+    return;
+  }
+
+  CFRunLoopRunInMode( kCFRunLoopDefaultMode, 0, false );
+  unsigned int nSrc = MIDIGetNumberOfSources();
+  if (nSrc < 1) {
+    errorString_ = "MidiInCore::openPort: no MIDI input sources found!";
+    error( RtMidiError::NO_DEVICES_FOUND, errorString_ );
+    return;
+  }
+
+  if ( portNumber >= nSrc ) {
+    std::ostringstream ost;
+    ost << "MidiInCore::openPort: the 'portNumber' argument (" << portNumber << ") is invalid.";
+    errorString_ = ost.str();
+    error( RtMidiError::INVALID_PARAMETER, errorString_ );
+    return;
+  }
+
+  MIDIPortRef port;
+  CoreMidiData *data = static_cast<CoreMidiData *> (apiData_);
+  OSStatus result = MIDIInputPortCreate( data->client, 
+                                         CFStringCreateWithCString( NULL, portName.c_str(), kCFStringEncodingASCII ),
+                                         midiInputCallback, (void *)&inputData_, &port );
+  if ( result != noErr ) {
+    MIDIClientDispose( data->client );
+    errorString_ = "MidiInCore::openPort: error creating OS-X MIDI input port.";
+    error( RtMidiError::DRIVER_ERROR, errorString_ );
+    return;
+  }
+
+  // Get the desired input source identifier.
+  MIDIEndpointRef endpoint = MIDIGetSource( portNumber );
+  if ( endpoint == 0 ) {
+    MIDIPortDispose( port );
+    MIDIClientDispose( data->client );
+    errorString_ = "MidiInCore::openPort: error getting MIDI input source reference.";
+    error( RtMidiError::DRIVER_ERROR, errorString_ );
+    return;
+  }
+
+  // Make the connection.
+  result = MIDIPortConnectSource( port, endpoint, NULL );
+  if ( result != noErr ) {
+    MIDIPortDispose( port );
+    MIDIClientDispose( data->client );
+    errorString_ = "MidiInCore::openPort: error connecting OS-X MIDI input port.";
+    error( RtMidiError::DRIVER_ERROR, errorString_ );
+    return;
+  }
+
+  // Save our api-specific port information.
+  data->port = port;
+
+  connected_ = true;
+}
+
+void MidiInCore :: openVirtualPort( const std::string portName )
+{
+  CoreMidiData *data = static_cast<CoreMidiData *> (apiData_);
+
+  // Create a virtual MIDI input destination.
+  MIDIEndpointRef endpoint;
+  OSStatus result = MIDIDestinationCreate( data->client,
+                                           CFStringCreateWithCString( NULL, portName.c_str(), kCFStringEncodingASCII ),
+                                           midiInputCallback, (void *)&inputData_, &endpoint );
+  if ( result != noErr ) {
+    errorString_ = "MidiInCore::openVirtualPort: error creating virtual OS-X MIDI destination.";
+    error( RtMidiError::DRIVER_ERROR, errorString_ );
+    return;
+  }
+
+  // Save our api-specific connection information.
+  data->endpoint = endpoint;
+}
+
+void MidiInCore :: closePort( void )
+{
+  CoreMidiData *data = static_cast<CoreMidiData *> (apiData_);
+
+  if ( data->endpoint ) {
+    MIDIEndpointDispose( data->endpoint );
+  }
+
+  if ( data->port ) {
+    MIDIPortDispose( data->port );
+  }
+
+  connected_ = false;
+}
+
+unsigned int MidiInCore :: getPortCount()
+{
+  CFRunLoopRunInMode( kCFRunLoopDefaultMode, 0, false );
+  return MIDIGetNumberOfSources();
+}
+
+// This function was submitted by Douglas Casey Tucker and apparently
+// derived largely from PortMidi.
+CFStringRef EndpointName( MIDIEndpointRef endpoint, bool isExternal )
+{
+  CFMutableStringRef result = CFStringCreateMutable( NULL, 0 );
+  CFStringRef str;
+
+  // Begin with the endpoint's name.
+  str = NULL;
+  MIDIObjectGetStringProperty( endpoint, kMIDIPropertyName, &str );
+  if ( str != NULL ) {
+    CFStringAppend( result, str );
+    CFRelease( str );
+  }
+
+  MIDIEntityRef entity = 0;
+  MIDIEndpointGetEntity( endpoint, &entity );
+  if ( entity == 0 )
+    // probably virtual
+    return result;
+
+  if ( CFStringGetLength( result ) == 0 ) {
+    // endpoint name has zero length -- try the entity
+    str = NULL;
+    MIDIObjectGetStringProperty( entity, kMIDIPropertyName, &str );
+    if ( str != NULL ) {
+      CFStringAppend( result, str );
+      CFRelease( str );
+    }
+  }
+  // now consider the device's name
+  MIDIDeviceRef device = 0;
+  MIDIEntityGetDevice( entity, &device );
+  if ( device == 0 )
+    return result;
+
+  str = NULL;
+  MIDIObjectGetStringProperty( device, kMIDIPropertyName, &str );
+  if ( CFStringGetLength( result ) == 0 ) {
+      CFRelease( result );
+      return str;
+  }
+  if ( str != NULL ) {
+    // if an external device has only one entity, throw away
+    // the endpoint name and just use the device name
+    if ( isExternal && MIDIDeviceGetNumberOfEntities( device ) < 2 ) {
+      CFRelease( result );
+      return str;
+    } else {
+      if ( CFStringGetLength( str ) == 0 ) {
+        CFRelease( str );
+        return result;
+      }
+      // does the entity name already start with the device name?
+      // (some drivers do this though they shouldn't)
+      // if so, do not prepend
+        if ( CFStringCompareWithOptions( result, /* endpoint name */
+             str /* device name */,
+             CFRangeMake(0, CFStringGetLength( str ) ), 0 ) != kCFCompareEqualTo ) {
+        // prepend the device name to the entity name
+        if ( CFStringGetLength( result ) > 0 )
+          CFStringInsert( result, 0, CFSTR(" ") );
+        CFStringInsert( result, 0, str );
+      }
+      CFRelease( str );
+    }
+  }
+  return result;
+}
+
+// This function was submitted by Douglas Casey Tucker and apparently
+// derived largely from PortMidi.
+static CFStringRef ConnectedEndpointName( MIDIEndpointRef endpoint )
+{
+  CFMutableStringRef result = CFStringCreateMutable( NULL, 0 );
+  CFStringRef str;
+  OSStatus err;
+  int i;
+
+  // Does the endpoint have connections?
+  CFDataRef connections = NULL;
+  int nConnected = 0;
+  bool anyStrings = false;
+  err = MIDIObjectGetDataProperty( endpoint, kMIDIPropertyConnectionUniqueID, &connections );
+  if ( connections != NULL ) {
+    // It has connections, follow them
+    // Concatenate the names of all connected devices
+    nConnected = CFDataGetLength( connections ) / sizeof(MIDIUniqueID);
+    if ( nConnected ) {
+      const SInt32 *pid = (const SInt32 *)(CFDataGetBytePtr(connections));
+      for ( i=0; i<nConnected; ++i, ++pid ) {
+        MIDIUniqueID id = EndianS32_BtoN( *pid );
+        MIDIObjectRef connObject;
+        MIDIObjectType connObjectType;
+        err = MIDIObjectFindByUniqueID( id, &connObject, &connObjectType );
+        if ( err == noErr ) {
+          if ( connObjectType == kMIDIObjectType_ExternalSource  ||
+              connObjectType == kMIDIObjectType_ExternalDestination ) {
+            // Connected to an external device's endpoint (10.3 and later).
+            str = EndpointName( (MIDIEndpointRef)(connObject), true );
+          } else {
+            // Connected to an external device (10.2) (or something else, catch-
+            str = NULL;
+            MIDIObjectGetStringProperty( connObject, kMIDIPropertyName, &str );
+          }
+          if ( str != NULL ) {
+            if ( anyStrings )
+              CFStringAppend( result, CFSTR(", ") );
+            else anyStrings = true;
+            CFStringAppend( result, str );
+            CFRelease( str );
+          }
+        }
+      }
+    }
+    CFRelease( connections );
+  }
+  if ( anyStrings )
+    return result;
+
+  CFRelease( result );
+
+  // Here, either the endpoint had no connections, or we failed to obtain names 
+  return EndpointName( endpoint, false );
+}
+
+std::string MidiInCore :: getPortName( unsigned int portNumber )
+{
+  CFStringRef nameRef;
+  MIDIEndpointRef portRef;
+  char name[128];
+
+  std::string stringName;
+  CFRunLoopRunInMode( kCFRunLoopDefaultMode, 0, false );
+  if ( portNumber >= MIDIGetNumberOfSources() ) {
+    std::ostringstream ost;
+    ost << "MidiInCore::getPortName: the 'portNumber' argument (" << portNumber << ") is invalid.";
+    errorString_ = ost.str();
+    error( RtMidiError::WARNING, errorString_ );
+    return stringName;
+  }
+
+  portRef = MIDIGetSource( portNumber );
+  nameRef = ConnectedEndpointName(portRef);
+  CFStringGetCString( nameRef, name, sizeof(name), CFStringGetSystemEncoding());
+  CFRelease( nameRef );
+
+  return stringName = name;
+}
+
+//*********************************************************************//
+//  API: OS-X
+//  Class Definitions: MidiOutCore
+//*********************************************************************//
+
+MidiOutCore :: MidiOutCore( const std::string clientName ) : MidiOutApi()
+{
+  initialize( clientName );
+}
+
+MidiOutCore :: ~MidiOutCore( void )
+{
+  // Close a connection if it exists.
+  closePort();
+
+  // Cleanup.
+  CoreMidiData *data = static_cast<CoreMidiData *> (apiData_);
+  MIDIClientDispose( data->client );
+  if ( data->endpoint ) MIDIEndpointDispose( data->endpoint );
+  delete data;
+}
+
+void MidiOutCore :: initialize( const std::string& clientName )
+{
+  // Set up our client.
+  MIDIClientRef client;
+  CFStringRef name = CFStringCreateWithCString( NULL, clientName.c_str(), kCFStringEncodingASCII );
+  OSStatus result = MIDIClientCreate(name, NULL, NULL, &client );
+  if ( result != noErr ) {
+    errorString_ = "MidiOutCore::initialize: error creating OS-X MIDI client object.";
+    error( RtMidiError::DRIVER_ERROR, errorString_ );
+    return;
+  }
+
+  // Save our api-specific connection information.
+  CoreMidiData *data = (CoreMidiData *) new CoreMidiData;
+  data->client = client;
+  data->endpoint = 0;
+  apiData_ = (void *) data;
+  CFRelease( name );
+}
+
+unsigned int MidiOutCore :: getPortCount()
+{
+  CFRunLoopRunInMode( kCFRunLoopDefaultMode, 0, false );
+  return MIDIGetNumberOfDestinations();
+}
+
+std::string MidiOutCore :: getPortName( unsigned int portNumber )
+{
+  CFStringRef nameRef;
+  MIDIEndpointRef portRef;
+  char name[128];
+
+  std::string stringName;
+  CFRunLoopRunInMode( kCFRunLoopDefaultMode, 0, false );
+  if ( portNumber >= MIDIGetNumberOfDestinations() ) {
+    std::ostringstream ost;
+    ost << "MidiOutCore::getPortName: the 'portNumber' argument (" << portNumber << ") is invalid.";
+    errorString_ = ost.str();
+    error( RtMidiError::WARNING, errorString_ );
+    return stringName;
+  }
+
+  portRef = MIDIGetDestination( portNumber );
+  nameRef = ConnectedEndpointName(portRef);
+  CFStringGetCString( nameRef, name, sizeof(name), CFStringGetSystemEncoding());
+  CFRelease( nameRef );
+  
+  return stringName = name;
+}
+
+void MidiOutCore :: openPort( unsigned int portNumber, const std::string portName )
+{
+  if ( connected_ ) {
+    errorString_ = "MidiOutCore::openPort: a valid connection already exists!";
+    error( RtMidiError::WARNING, errorString_ );
+    return;
+  }
+
+  CFRunLoopRunInMode( kCFRunLoopDefaultMode, 0, false );
+  unsigned int nDest = MIDIGetNumberOfDestinations();
+  if (nDest < 1) {
+    errorString_ = "MidiOutCore::openPort: no MIDI output destinations found!";
+    error( RtMidiError::NO_DEVICES_FOUND, errorString_ );
+    return;
+  }
+
+  if ( portNumber >= nDest ) {
+    std::ostringstream ost;
+    ost << "MidiOutCore::openPort: the 'portNumber' argument (" << portNumber << ") is invalid.";
+    errorString_ = ost.str();
+    error( RtMidiError::INVALID_PARAMETER, errorString_ );
+    return;
+  }
+
+  MIDIPortRef port;
+  CoreMidiData *data = static_cast<CoreMidiData *> (apiData_);
+  OSStatus result = MIDIOutputPortCreate( data->client, 
+                                          CFStringCreateWithCString( NULL, portName.c_str(), kCFStringEncodingASCII ),
+                                          &port );
+  if ( result != noErr ) {
+    MIDIClientDispose( data->client );
+    errorString_ = "MidiOutCore::openPort: error creating OS-X MIDI output port.";
+    error( RtMidiError::DRIVER_ERROR, errorString_ );
+    return;
+  }
+
+  // Get the desired output port identifier.
+  MIDIEndpointRef destination = MIDIGetDestination( portNumber );
+  if ( destination == 0 ) {
+    MIDIPortDispose( port );
+    MIDIClientDispose( data->client );
+    errorString_ = "MidiOutCore::openPort: error getting MIDI output destination reference.";
+    error( RtMidiError::DRIVER_ERROR, errorString_ );
+    return;
+  }
+
+  // Save our api-specific connection information.
+  data->port = port;
+  data->destinationId = destination;
+  connected_ = true;
+}
+
+void MidiOutCore :: closePort( void )
+{
+  CoreMidiData *data = static_cast<CoreMidiData *> (apiData_);
+
+  if ( data->endpoint ) {
+    MIDIEndpointDispose( data->endpoint );
+  }
+
+  if ( data->port ) {
+    MIDIPortDispose( data->port );
+  }
+
+  connected_ = false;
+}
+
+void MidiOutCore :: openVirtualPort( std::string portName )
+{
+  CoreMidiData *data = static_cast<CoreMidiData *> (apiData_);
+
+  if ( data->endpoint ) {
+    errorString_ = "MidiOutCore::openVirtualPort: a virtual output port already exists!";
+    error( RtMidiError::WARNING, errorString_ );
+    return;
+  }
+
+  // Create a virtual MIDI output source.
+  MIDIEndpointRef endpoint;
+  OSStatus result = MIDISourceCreate( data->client,
+                                      CFStringCreateWithCString( NULL, portName.c_str(), kCFStringEncodingASCII ),
+                                      &endpoint );
+  if ( result != noErr ) {
+    errorString_ = "MidiOutCore::initialize: error creating OS-X virtual MIDI source.";
+    error( RtMidiError::DRIVER_ERROR, errorString_ );
+    return;
+  }
+
+  // Save our api-specific connection information.
+  data->endpoint = endpoint;
+}
+
+void MidiOutCore :: sendMessage( std::vector<unsigned char> *message )
+{
+  // We use the MIDISendSysex() function to asynchronously send sysex
+  // messages.  Otherwise, we use a single CoreMidi MIDIPacket.
+  unsigned int nBytes = message->size();
+  if ( nBytes == 0 ) {
+    errorString_ = "MidiOutCore::sendMessage: no data in message argument!";      
+    error( RtMidiError::WARNING, errorString_ );
+    return;
+  }
+
+  MIDITimeStamp timeStamp = AudioGetCurrentHostTime();
+  CoreMidiData *data = static_cast<CoreMidiData *> (apiData_);
+  OSStatus result;
+
+  if ( message->at(0) != 0xF0 && nBytes > 3 ) {
+    errorString_ = "MidiOutCore::sendMessage: message format problem ... not sysex but > 3 bytes?";
+    error( RtMidiError::WARNING, errorString_ );
+    return;
+  }
+
+  Byte buffer[nBytes+(sizeof(MIDIPacketList))];
+  ByteCount listSize = sizeof(buffer);
+  MIDIPacketList *packetList = (MIDIPacketList*)buffer;
+  MIDIPacket *packet = MIDIPacketListInit( packetList );
+
+  ByteCount remainingBytes = nBytes;
+  while (remainingBytes && packet) {
+    ByteCount bytesForPacket = remainingBytes > 65535 ? 65535 : remainingBytes; // 65535 = maximum size of a MIDIPacket
+    const Byte* dataStartPtr = (const Byte *) &message->at( nBytes - remainingBytes );
+    packet = MIDIPacketListAdd( packetList, listSize, packet, timeStamp, bytesForPacket, dataStartPtr);
+    remainingBytes -= bytesForPacket; 
+  }
+
+  if ( !packet ) {
+    errorString_ = "MidiOutCore::sendMessage: could not allocate packet list";      
+    error( RtMidiError::DRIVER_ERROR, errorString_ );
+    return;
+  }
+
+  // Send to any destinations that may have connected to us.
+  if ( data->endpoint ) {
+    result = MIDIReceived( data->endpoint, packetList );
+    if ( result != noErr ) {
+      errorString_ = "MidiOutCore::sendMessage: error sending MIDI to virtual destinations.";
+      error( RtMidiError::WARNING, errorString_ );
+    }
+  }
+
+  // And send to an explicit destination port if we're connected.
+  if ( connected_ ) {
+    result = MIDISend( data->port, data->destinationId, packetList );
+    if ( result != noErr ) {
+      errorString_ = "MidiOutCore::sendMessage: error sending MIDI message to port.";
+      error( RtMidiError::WARNING, errorString_ );
+    }
+  }
+}
+
+#endif  // __MACOSX_CORE__
+
+
+//*********************************************************************//
+//  API: LINUX ALSA SEQUENCER
+//*********************************************************************//
+
+// API information found at:
+//   - http://www.alsa-project.org/documentation.php#Library
+
+#if defined(__LINUX_ALSA__)
+
+// The ALSA Sequencer API is based on the use of a callback function for
+// MIDI input.
+//
+// Thanks to Pedro Lopez-Cabanillas for help with the ALSA sequencer
+// time stamps and other assorted fixes!!!
+
+// If you don't need timestamping for incoming MIDI events, define the
+// preprocessor definition AVOID_TIMESTAMPING to save resources
+// associated with the ALSA sequencer queues.
+
+#include <pthread.h>
+#include <sys/time.h>
+
+// ALSA header file.
+#include <alsa/asoundlib.h>
+
+// A structure to hold variables related to the ALSA API
+// implementation.
+struct AlsaMidiData {
+  snd_seq_t *seq;
+  unsigned int portNum;
+  int vport;
+  snd_seq_port_subscribe_t *subscription;
+  snd_midi_event_t *coder;
+  unsigned int bufferSize;
+  unsigned char *buffer;
+  pthread_t thread;
+  pthread_t dummy_thread_id;
+  unsigned long long lastTime;
+  int queue_id; // an input queue is needed to get timestamped events
+  int trigger_fds[2];
+};
+
+#define PORT_TYPE( pinfo, bits ) ((snd_seq_port_info_get_capability(pinfo) & (bits)) == (bits))
+
+//*********************************************************************//
+//  API: LINUX ALSA
+//  Class Definitions: MidiInAlsa
+//*********************************************************************//
+
+static void *alsaMidiHandler( void *ptr )
+{
+  MidiInApi::RtMidiInData *data = static_cast<MidiInApi::RtMidiInData *> (ptr);
+  AlsaMidiData *apiData = static_cast<AlsaMidiData *> (data->apiData);
+
+  long nBytes;
+  unsigned long long time, lastTime;
+  bool continueSysex = false;
+  bool doDecode = false;
+  MidiInApi::MidiMessage message;
+  int poll_fd_count;
+  struct pollfd *poll_fds;
+
+  snd_seq_event_t *ev;
+  int result;
+  apiData->bufferSize = 32;
+  result = snd_midi_event_new( 0, &apiData->coder );
+  if ( result < 0 ) {
+    data->doInput = false;
+    std::cerr << "\nMidiInAlsa::alsaMidiHandler: error initializing MIDI event parser!\n\n";
+    return 0;
+  }
+  unsigned char *buffer = (unsigned char *) malloc( apiData->bufferSize );
+  if ( buffer == NULL ) {
+    data->doInput = false;
+    snd_midi_event_free( apiData->coder );
+    apiData->coder = 0;
+    std::cerr << "\nMidiInAlsa::alsaMidiHandler: error initializing buffer memory!\n\n";
+    return 0;
+  }
+  snd_midi_event_init( apiData->coder );
+  snd_midi_event_no_status( apiData->coder, 1 ); // suppress running status messages
+
+  poll_fd_count = snd_seq_poll_descriptors_count( apiData->seq, POLLIN ) + 1;
+  poll_fds = (struct pollfd*)alloca( poll_fd_count * sizeof( struct pollfd ));
+  snd_seq_poll_descriptors( apiData->seq, poll_fds + 1, poll_fd_count - 1, POLLIN );
+  poll_fds[0].fd = apiData->trigger_fds[0];
+  poll_fds[0].events = POLLIN;
+
+  while ( data->doInput ) {
+
+    if ( snd_seq_event_input_pending( apiData->seq, 1 ) == 0 ) {
+      // No data pending
+      if ( poll( poll_fds, poll_fd_count, -1) >= 0 ) {
+        if ( poll_fds[0].revents & POLLIN ) {
+          bool dummy;
+          int res = read( poll_fds[0].fd, &dummy, sizeof(dummy) );
+          (void) res;
+        }
+      }
+      continue;
+    }
+
+    // If here, there should be data.
+    result = snd_seq_event_input( apiData->seq, &ev );
+    if ( result == -ENOSPC ) {
+      std::cerr << "\nMidiInAlsa::alsaMidiHandler: MIDI input buffer overrun!\n\n";
+      continue;
+    }
+    else if ( result <= 0 ) {
+      std::cerr << "\nMidiInAlsa::alsaMidiHandler: unknown MIDI input error!\n";
+      perror("System reports");
+      continue;
+    }
+
+    // This is a bit weird, but we now have to decode an ALSA MIDI
+    // event (back) into MIDI bytes.  We'll ignore non-MIDI types.
+    if ( !continueSysex ) message.bytes.clear();
+
+    doDecode = false;
+    switch ( ev->type ) {
+
+    case SND_SEQ_EVENT_PORT_SUBSCRIBED:
+#if defined(__RTMIDI_DEBUG__)
+      std::cout << "MidiInAlsa::alsaMidiHandler: port connection made!\n";
+#endif
+      break;
+
+    case SND_SEQ_EVENT_PORT_UNSUBSCRIBED:
+#if defined(__RTMIDI_DEBUG__)
+      std::cerr << "MidiInAlsa::alsaMidiHandler: port connection has closed!\n";
+      std::cout << "sender = " << (int) ev->data.connect.sender.client << ":"
+                << (int) ev->data.connect.sender.port
+                << ", dest = " << (int) ev->data.connect.dest.client << ":"
+                << (int) ev->data.connect.dest.port
+                << std::endl;
+#endif
+      break;
+
+    case SND_SEQ_EVENT_QFRAME: // MIDI time code
+      if ( !( data->ignoreFlags & 0x02 ) ) doDecode = true;
+      break;
+
+    case SND_SEQ_EVENT_TICK: // 0xF9 ... MIDI timing tick
+      if ( !( data->ignoreFlags & 0x02 ) ) doDecode = true;
+      break;
+
+    case SND_SEQ_EVENT_CLOCK: // 0xF8 ... MIDI timing (clock) tick
+      if ( !( data->ignoreFlags & 0x02 ) ) doDecode = true;
+      break;
+
+    case SND_SEQ_EVENT_SENSING: // Active sensing
+      if ( !( data->ignoreFlags & 0x04 ) ) doDecode = true;
+      break;
+
+		case SND_SEQ_EVENT_SYSEX:
+      if ( (data->ignoreFlags & 0x01) ) break;
+      if ( ev->data.ext.len > apiData->bufferSize ) {
+        apiData->bufferSize = ev->data.ext.len;
+        free( buffer );
+        buffer = (unsigned char *) malloc( apiData->bufferSize );
+        if ( buffer == NULL ) {
+          data->doInput = false;
+          std::cerr << "\nMidiInAlsa::alsaMidiHandler: error resizing buffer memory!\n\n";
+          break;
+        }
+      }
+
+    default:
+      doDecode = true;
+    }
+
+    if ( doDecode ) {
+
+      nBytes = snd_midi_event_decode( apiData->coder, buffer, apiData->bufferSize, ev );
+      if ( nBytes > 0 ) {
+        // The ALSA sequencer has a maximum buffer size for MIDI sysex
+        // events of 256 bytes.  If a device sends sysex messages larger
+        // than this, they are segmented into 256 byte chunks.  So,
+        // we'll watch for this and concatenate sysex chunks into a
+        // single sysex message if necessary.
+        if ( !continueSysex )
+          message.bytes.assign( buffer, &buffer[nBytes] );
+        else
+          message.bytes.insert( message.bytes.end(), buffer, &buffer[nBytes] );
+
+        continueSysex = ( ( ev->type == SND_SEQ_EVENT_SYSEX ) && ( message.bytes.back() != 0xF7 ) );
+        if ( !continueSysex ) {
+
+          // Calculate the time stamp:
+          message.timeStamp = 0.0;
+
+          // Method 1: Use the system time.
+          //(void)gettimeofday(&tv, (struct timezone *)NULL);
+          //time = (tv.tv_sec * 1000000) + tv.tv_usec;
+
+          // Method 2: Use the ALSA sequencer event time data.
+          // (thanks to Pedro Lopez-Cabanillas!).
+          time = ( ev->time.time.tv_sec * 1000000 ) + ( ev->time.time.tv_nsec/1000 );
+          lastTime = time;
+          time -= apiData->lastTime;
+          apiData->lastTime = lastTime;
+          if ( data->firstMessage == true )
+            data->firstMessage = false;
+          else
+            message.timeStamp = time * 0.000001;
+        }
+        else {
+#if defined(__RTMIDI_DEBUG__)
+          std::cerr << "\nMidiInAlsa::alsaMidiHandler: event parsing error or not a MIDI event!\n\n";
+#endif
+        }
+      }
+    }
+
+    snd_seq_free_event( ev );
+    if ( message.bytes.size() == 0 || continueSysex ) continue;
+
+    if ( data->usingCallback ) {
+      RtMidiIn::RtMidiCallback callback = (RtMidiIn::RtMidiCallback) data->userCallback;
+      callback( message.timeStamp, &message.bytes, data->userData );
+    }
+    else {
+      // As long as we haven't reached our queue size limit, push the message.
+      if ( data->queue.size < data->queue.ringSize ) {
+        data->queue.ring[data->queue.back++] = message;
+        if ( data->queue.back == data->queue.ringSize )
+          data->queue.back = 0;
+        data->queue.size++;
+      }
+      else
+        std::cerr << "\nMidiInAlsa: message queue limit reached!!\n\n";
+    }
+  }
+
+  if ( buffer ) free( buffer );
+  snd_midi_event_free( apiData->coder );
+  apiData->coder = 0;
+  apiData->thread = apiData->dummy_thread_id;
+  return 0;
+}
+
+MidiInAlsa :: MidiInAlsa( const std::string clientName, unsigned int queueSizeLimit ) : MidiInApi( queueSizeLimit )
+{
+  initialize( clientName );
+}
+
+MidiInAlsa :: ~MidiInAlsa()
+{
+  // Close a connection if it exists.
+  closePort();
+
+  // Shutdown the input thread.
+  AlsaMidiData *data = static_cast<AlsaMidiData *> (apiData_);
+  if ( inputData_.doInput ) {
+    inputData_.doInput = false;
+    int res = write( data->trigger_fds[1], &inputData_.doInput, sizeof(inputData_.doInput) );
+    (void) res;
+    if ( !pthread_equal(data->thread, data->dummy_thread_id) )
+      pthread_join( data->thread, NULL );
+  }
+
+  // Cleanup.
+  close ( data->trigger_fds[0] );
+  close ( data->trigger_fds[1] );
+  if ( data->vport >= 0 ) snd_seq_delete_port( data->seq, data->vport );
+#ifndef AVOID_TIMESTAMPING
+  snd_seq_free_queue( data->seq, data->queue_id );
+#endif
+  snd_seq_close( data->seq );
+  delete data;
+}
+
+void MidiInAlsa :: initialize( const std::string& clientName )
+{
+  // Set up the ALSA sequencer client.
+  snd_seq_t *seq;
+  int result = snd_seq_open(&seq, "default", SND_SEQ_OPEN_DUPLEX, SND_SEQ_NONBLOCK);
+  if ( result < 0 ) {
+    errorString_ = "MidiInAlsa::initialize: error creating ALSA sequencer client object.";
+    error( RtMidiError::DRIVER_ERROR, errorString_ );
+    return;
+  }
+
+  // Set client name.
+  snd_seq_set_client_name( seq, clientName.c_str() );
+
+  // Save our api-specific connection information.
+  AlsaMidiData *data = (AlsaMidiData *) new AlsaMidiData;
+  data->seq = seq;
+  data->portNum = -1;
+  data->vport = -1;
+  data->subscription = 0;
+  data->dummy_thread_id = pthread_self();
+  data->thread = data->dummy_thread_id;
+  data->trigger_fds[0] = -1;
+  data->trigger_fds[1] = -1;
+  apiData_ = (void *) data;
+  inputData_.apiData = (void *) data;
+
+   if ( pipe(data->trigger_fds) == -1 ) {
+    errorString_ = "MidiInAlsa::initialize: error creating pipe objects.";
+    error( RtMidiError::DRIVER_ERROR, errorString_ );
+    return;
+  }
+
+  // Create the input queue
+#ifndef AVOID_TIMESTAMPING
+  data->queue_id = snd_seq_alloc_named_queue(seq, "RtMidi Queue");
+  // Set arbitrary tempo (mm=100) and resolution (240)
+  snd_seq_queue_tempo_t *qtempo;
+  snd_seq_queue_tempo_alloca(&qtempo);
+  snd_seq_queue_tempo_set_tempo(qtempo, 600000);
+  snd_seq_queue_tempo_set_ppq(qtempo, 240);
+  snd_seq_set_queue_tempo(data->seq, data->queue_id, qtempo);
+  snd_seq_drain_output(data->seq);
+#endif
+}
+
+// This function is used to count or get the pinfo structure for a given port number.
+unsigned int portInfo( snd_seq_t *seq, snd_seq_port_info_t *pinfo, unsigned int type, int portNumber )
+{
+  snd_seq_client_info_t *cinfo;
+  int client;
+  int count = 0;
+  snd_seq_client_info_alloca( &cinfo );
+
+  snd_seq_client_info_set_client( cinfo, -1 );
+  while ( snd_seq_query_next_client( seq, cinfo ) >= 0 ) {
+    client = snd_seq_client_info_get_client( cinfo );
+    if ( client == 0 ) continue;
+    // Reset query info
+    snd_seq_port_info_set_client( pinfo, client );
+    snd_seq_port_info_set_port( pinfo, -1 );
+    while ( snd_seq_query_next_port( seq, pinfo ) >= 0 ) {
+      unsigned int atyp = snd_seq_port_info_get_type( pinfo );
+      if ( ( ( atyp & SND_SEQ_PORT_TYPE_MIDI_GENERIC ) == 0 ) &&
+        ( ( atyp & SND_SEQ_PORT_TYPE_SYNTH ) == 0 ) ) continue;
+      unsigned int caps = snd_seq_port_info_get_capability( pinfo );
+      if ( ( caps & type ) != type ) continue;
+      if ( count == portNumber ) return 1;
+      ++count;
+    }
+  }
+
+  // If a negative portNumber was used, return the port count.
+  if ( portNumber < 0 ) return count;
+  return 0;
+}
+
+unsigned int MidiInAlsa :: getPortCount()
+{
+  snd_seq_port_info_t *pinfo;
+  snd_seq_port_info_alloca( &pinfo );
+
+  AlsaMidiData *data = static_cast<AlsaMidiData *> (apiData_);
+  return portInfo( data->seq, pinfo, SND_SEQ_PORT_CAP_READ|SND_SEQ_PORT_CAP_SUBS_READ, -1 );
+}
+
+std::string MidiInAlsa :: getPortName( unsigned int portNumber )
+{
+  snd_seq_client_info_t *cinfo;
+  snd_seq_port_info_t *pinfo;
+  snd_seq_client_info_alloca( &cinfo );
+  snd_seq_port_info_alloca( &pinfo );
+
+  std::string stringName;
+  AlsaMidiData *data = static_cast<AlsaMidiData *> (apiData_);
+  if ( portInfo( data->seq, pinfo, SND_SEQ_PORT_CAP_READ|SND_SEQ_PORT_CAP_SUBS_READ, (int) portNumber ) ) {
+    int cnum = snd_seq_port_info_get_client( pinfo );
+    snd_seq_get_any_client_info( data->seq, cnum, cinfo );
+    std::ostringstream os;
+    os << snd_seq_client_info_get_name( cinfo );
+    os << " ";                                    // These lines added to make sure devices are listed
+    os << snd_seq_port_info_get_client( pinfo );  // with full portnames added to ensure individual device names
+    os << ":";
+    os << snd_seq_port_info_get_port( pinfo );
+    stringName = os.str();
+    return stringName;
+  }
+
+  // If we get here, we didn't find a match.
+  errorString_ = "MidiInAlsa::getPortName: error looking for port name!";
+  error( RtMidiError::WARNING, errorString_ );
+  return stringName;
+}
+
+void MidiInAlsa :: openPort( unsigned int portNumber, const std::string portName )
+{
+  if ( connected_ ) {
+    errorString_ = "MidiInAlsa::openPort: a valid connection already exists!";
+    error( RtMidiError::WARNING, errorString_ );
+    return;
+  }
+
+  unsigned int nSrc = this->getPortCount();
+  if ( nSrc < 1 ) {
+    errorString_ = "MidiInAlsa::openPort: no MIDI input sources found!";
+    error( RtMidiError::NO_DEVICES_FOUND, errorString_ );
+    return;
+  }
+
+  snd_seq_port_info_t *src_pinfo;
+  snd_seq_port_info_alloca( &src_pinfo );
+  AlsaMidiData *data = static_cast<AlsaMidiData *> (apiData_);
+  if ( portInfo( data->seq, src_pinfo, SND_SEQ_PORT_CAP_READ|SND_SEQ_PORT_CAP_SUBS_READ, (int) portNumber ) == 0 ) {
+    std::ostringstream ost;
+    ost << "MidiInAlsa::openPort: the 'portNumber' argument (" << portNumber << ") is invalid.";
+    errorString_ = ost.str();
+    error( RtMidiError::INVALID_PARAMETER, errorString_ );
+    return;
+  }
+
+  snd_seq_addr_t sender, receiver;
+  sender.client = snd_seq_port_info_get_client( src_pinfo );
+  sender.port = snd_seq_port_info_get_port( src_pinfo );
+  receiver.client = snd_seq_client_id( data->seq );
+
+  snd_seq_port_info_t *pinfo;
+  snd_seq_port_info_alloca( &pinfo );
+  if ( data->vport < 0 ) {
+    snd_seq_port_info_set_client( pinfo, 0 );
+    snd_seq_port_info_set_port( pinfo, 0 );
+    snd_seq_port_info_set_capability( pinfo,
+                                      SND_SEQ_PORT_CAP_WRITE |
+                                      SND_SEQ_PORT_CAP_SUBS_WRITE );
+    snd_seq_port_info_set_type( pinfo,
+                                SND_SEQ_PORT_TYPE_MIDI_GENERIC |
+                                SND_SEQ_PORT_TYPE_APPLICATION );
+    snd_seq_port_info_set_midi_channels(pinfo, 16);
+#ifndef AVOID_TIMESTAMPING
+    snd_seq_port_info_set_timestamping(pinfo, 1);
+    snd_seq_port_info_set_timestamp_real(pinfo, 1);    
+    snd_seq_port_info_set_timestamp_queue(pinfo, data->queue_id);
+#endif
+    snd_seq_port_info_set_name(pinfo,  portName.c_str() );
+    data->vport = snd_seq_create_port(data->seq, pinfo);
+  
+    if ( data->vport < 0 ) {
+      errorString_ = "MidiInAlsa::openPort: ALSA error creating input port.";
+      error( RtMidiError::DRIVER_ERROR, errorString_ );
+      return;
+    }
+    data->vport = snd_seq_port_info_get_port(pinfo);
+  }
+
+  receiver.port = data->vport;
+
+  if ( !data->subscription ) {
+    // Make subscription
+    if (snd_seq_port_subscribe_malloc( &data->subscription ) < 0) {
+      errorString_ = "MidiInAlsa::openPort: ALSA error allocation port subscription.";
+      error( RtMidiError::DRIVER_ERROR, errorString_ );
+      return;
+    }
+    snd_seq_port_subscribe_set_sender(data->subscription, &sender);
+    snd_seq_port_subscribe_set_dest(data->subscription, &receiver);
+    if ( snd_seq_subscribe_port(data->seq, data->subscription) ) {
+      snd_seq_port_subscribe_free( data->subscription );
+      data->subscription = 0;
+      errorString_ = "MidiInAlsa::openPort: ALSA error making port connection.";
+      error( RtMidiError::DRIVER_ERROR, errorString_ );
+      return;
+    }
+  }
+
+  if ( inputData_.doInput == false ) {
+    // Start the input queue
+#ifndef AVOID_TIMESTAMPING
+    snd_seq_start_queue( data->seq, data->queue_id, NULL );
+    snd_seq_drain_output( data->seq );
+#endif
+    // Start our MIDI input thread.
+    pthread_attr_t attr;
+    pthread_attr_init(&attr);
+    pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_JOINABLE);
+    pthread_attr_setschedpolicy(&attr, SCHED_OTHER);
+
+    inputData_.doInput = true;
+    int err = pthread_create(&data->thread, &attr, alsaMidiHandler, &inputData_);
+    pthread_attr_destroy(&attr);
+    if ( err ) {
+      snd_seq_unsubscribe_port( data->seq, data->subscription );
+      snd_seq_port_subscribe_free( data->subscription );
+      data->subscription = 0;
+      inputData_.doInput = false;
+      errorString_ = "MidiInAlsa::openPort: error starting MIDI input thread!";
+      error( RtMidiError::THREAD_ERROR, errorString_ );
+      return;
+    }
+  }
+
+  connected_ = true;
+}
+
+void MidiInAlsa :: openVirtualPort( std::string portName )
+{
+  AlsaMidiData *data = static_cast<AlsaMidiData *> (apiData_);
+  if ( data->vport < 0 ) {
+    snd_seq_port_info_t *pinfo;
+    snd_seq_port_info_alloca( &pinfo );
+    snd_seq_port_info_set_capability( pinfo,
+				      SND_SEQ_PORT_CAP_WRITE |
+				      SND_SEQ_PORT_CAP_SUBS_WRITE );
+    snd_seq_port_info_set_type( pinfo,
+				SND_SEQ_PORT_TYPE_MIDI_GENERIC |
+				SND_SEQ_PORT_TYPE_APPLICATION );
+    snd_seq_port_info_set_midi_channels(pinfo, 16);
+#ifndef AVOID_TIMESTAMPING
+    snd_seq_port_info_set_timestamping(pinfo, 1);
+    snd_seq_port_info_set_timestamp_real(pinfo, 1);    
+    snd_seq_port_info_set_timestamp_queue(pinfo, data->queue_id);
+#endif
+    snd_seq_port_info_set_name(pinfo, portName.c_str());
+    data->vport = snd_seq_create_port(data->seq, pinfo);
+
+    if ( data->vport < 0 ) {
+      errorString_ = "MidiInAlsa::openVirtualPort: ALSA error creating virtual port.";
+      error( RtMidiError::DRIVER_ERROR, errorString_ );
+      return;
+    }
+    data->vport = snd_seq_port_info_get_port(pinfo);
+  }
+
+  if ( inputData_.doInput == false ) {
+    // Wait for old thread to stop, if still running
+    if ( !pthread_equal(data->thread, data->dummy_thread_id) )
+      pthread_join( data->thread, NULL );
+
+    // Start the input queue
+#ifndef AVOID_TIMESTAMPING
+    snd_seq_start_queue( data->seq, data->queue_id, NULL );
+    snd_seq_drain_output( data->seq );
+#endif
+    // Start our MIDI input thread.
+    pthread_attr_t attr;
+    pthread_attr_init(&attr);
+    pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_JOINABLE);
+    pthread_attr_setschedpolicy(&attr, SCHED_OTHER);
+
+    inputData_.doInput = true;
+    int err = pthread_create(&data->thread, &attr, alsaMidiHandler, &inputData_);
+    pthread_attr_destroy(&attr);
+    if ( err ) {
+      if ( data->subscription ) {
+        snd_seq_unsubscribe_port( data->seq, data->subscription );
+        snd_seq_port_subscribe_free( data->subscription );
+        data->subscription = 0;
+      }
+      inputData_.doInput = false;
+      errorString_ = "MidiInAlsa::openPort: error starting MIDI input thread!";
+      error( RtMidiError::THREAD_ERROR, errorString_ );
+      return;
+    }
+  }
+}
+
+void MidiInAlsa :: closePort( void )
+{
+  AlsaMidiData *data = static_cast<AlsaMidiData *> (apiData_);
+
+  if ( connected_ ) {
+    if ( data->subscription ) {
+      snd_seq_unsubscribe_port( data->seq, data->subscription );
+      snd_seq_port_subscribe_free( data->subscription );
+      data->subscription = 0;
+    }
+    // Stop the input queue
+#ifndef AVOID_TIMESTAMPING
+    snd_seq_stop_queue( data->seq, data->queue_id, NULL );
+    snd_seq_drain_output( data->seq );
+#endif
+    connected_ = false;
+  }
+
+  // Stop thread to avoid triggering the callback, while the port is intended to be closed
+  if ( inputData_.doInput ) {
+    inputData_.doInput = false;
+    int res = write( data->trigger_fds[1], &inputData_.doInput, sizeof(inputData_.doInput) );
+    (void) res;
+    if ( !pthread_equal(data->thread, data->dummy_thread_id) )
+      pthread_join( data->thread, NULL );
+  }
+}
+
+//*********************************************************************//
+//  API: LINUX ALSA
+//  Class Definitions: MidiOutAlsa
+//*********************************************************************//
+
+MidiOutAlsa :: MidiOutAlsa( const std::string clientName ) : MidiOutApi()
+{
+  initialize( clientName );
+}
+
+MidiOutAlsa :: ~MidiOutAlsa()
+{
+  // Close a connection if it exists.
+  closePort();
+
+  // Cleanup.
+  AlsaMidiData *data = static_cast<AlsaMidiData *> (apiData_);
+  if ( data->vport >= 0 ) snd_seq_delete_port( data->seq, data->vport );
+  if ( data->coder ) snd_midi_event_free( data->coder );
+  if ( data->buffer ) free( data->buffer );
+  snd_seq_close( data->seq );
+  delete data;
+}
+
+void MidiOutAlsa :: initialize( const std::string& clientName )
+{
+  // Set up the ALSA sequencer client.
+  snd_seq_t *seq;
+  int result1 = snd_seq_open( &seq, "default", SND_SEQ_OPEN_OUTPUT, SND_SEQ_NONBLOCK );
+  if ( result1 < 0 ) {
+    errorString_ = "MidiOutAlsa::initialize: error creating ALSA sequencer client object.";
+    error( RtMidiError::DRIVER_ERROR, errorString_ );
+    return;
+	}
+
+  // Set client name.
+  snd_seq_set_client_name( seq, clientName.c_str() );
+
+  // Save our api-specific connection information.
+  AlsaMidiData *data = (AlsaMidiData *) new AlsaMidiData;
+  data->seq = seq;
+  data->portNum = -1;
+  data->vport = -1;
+  data->bufferSize = 32;
+  data->coder = 0;
+  data->buffer = 0;
+  int result = snd_midi_event_new( data->bufferSize, &data->coder );
+  if ( result < 0 ) {
+    delete data;
+    errorString_ = "MidiOutAlsa::initialize: error initializing MIDI event parser!\n\n";
+    error( RtMidiError::DRIVER_ERROR, errorString_ );
+    return;
+  }
+  data->buffer = (unsigned char *) malloc( data->bufferSize );
+  if ( data->buffer == NULL ) {
+    delete data;
+    errorString_ = "MidiOutAlsa::initialize: error allocating buffer memory!\n\n";
+    error( RtMidiError::MEMORY_ERROR, errorString_ );
+    return;
+  }
+  snd_midi_event_init( data->coder );
+  apiData_ = (void *) data;
+}
+
+unsigned int MidiOutAlsa :: getPortCount()
+{
+	snd_seq_port_info_t *pinfo;
+	snd_seq_port_info_alloca( &pinfo );
+
+  AlsaMidiData *data = static_cast<AlsaMidiData *> (apiData_);
+  return portInfo( data->seq, pinfo, SND_SEQ_PORT_CAP_WRITE|SND_SEQ_PORT_CAP_SUBS_WRITE, -1 );
+}
+
+std::string MidiOutAlsa :: getPortName( unsigned int portNumber )
+{
+  snd_seq_client_info_t *cinfo;
+  snd_seq_port_info_t *pinfo;
+  snd_seq_client_info_alloca( &cinfo );
+  snd_seq_port_info_alloca( &pinfo );
+
+  std::string stringName;
+  AlsaMidiData *data = static_cast<AlsaMidiData *> (apiData_);
+  if ( portInfo( data->seq, pinfo, SND_SEQ_PORT_CAP_WRITE|SND_SEQ_PORT_CAP_SUBS_WRITE, (int) portNumber ) ) {
+    int cnum = snd_seq_port_info_get_client(pinfo);
+    snd_seq_get_any_client_info( data->seq, cnum, cinfo );
+    std::ostringstream os;
+    os << snd_seq_client_info_get_name(cinfo);
+    os << " ";                                    // These lines added to make sure devices are listed
+    os << snd_seq_port_info_get_client( pinfo );  // with full portnames added to ensure individual device names
+    os << ":";
+    os << snd_seq_port_info_get_port(pinfo);
+    stringName = os.str();
+    return stringName;
+  }
+
+  // If we get here, we didn't find a match.
+  errorString_ = "MidiOutAlsa::getPortName: error looking for port name!";
+  error( RtMidiError::WARNING, errorString_ );
+  return stringName;
+}
+
+void MidiOutAlsa :: openPort( unsigned int portNumber, const std::string portName )
+{
+  if ( connected_ ) {
+    errorString_ = "MidiOutAlsa::openPort: a valid connection already exists!";
+    error( RtMidiError::WARNING, errorString_ );
+    return;
+  }
+
+  unsigned int nSrc = this->getPortCount();
+  if (nSrc < 1) {
+    errorString_ = "MidiOutAlsa::openPort: no MIDI output sources found!";
+    error( RtMidiError::NO_DEVICES_FOUND, errorString_ );
+    return;
+  }
+
+	snd_seq_port_info_t *pinfo;
+	snd_seq_port_info_alloca( &pinfo );
+  AlsaMidiData *data = static_cast<AlsaMidiData *> (apiData_);
+  if ( portInfo( data->seq, pinfo, SND_SEQ_PORT_CAP_WRITE|SND_SEQ_PORT_CAP_SUBS_WRITE, (int) portNumber ) == 0 ) {
+    std::ostringstream ost;
+    ost << "MidiOutAlsa::openPort: the 'portNumber' argument (" << portNumber << ") is invalid.";
+    errorString_ = ost.str();
+    error( RtMidiError::INVALID_PARAMETER, errorString_ );
+    return;
+  }
+
+  snd_seq_addr_t sender, receiver;
+  receiver.client = snd_seq_port_info_get_client( pinfo );
+  receiver.port = snd_seq_port_info_get_port( pinfo );
+  sender.client = snd_seq_client_id( data->seq );
+
+  if ( data->vport < 0 ) {
+    data->vport = snd_seq_create_simple_port( data->seq, portName.c_str(),
+                                              SND_SEQ_PORT_CAP_READ|SND_SEQ_PORT_CAP_SUBS_READ,
+                                              SND_SEQ_PORT_TYPE_MIDI_GENERIC|SND_SEQ_PORT_TYPE_APPLICATION );
+    if ( data->vport < 0 ) {
+      errorString_ = "MidiOutAlsa::openPort: ALSA error creating output port.";
+      error( RtMidiError::DRIVER_ERROR, errorString_ );
+      return;
+    }
+  }
+
+  sender.port = data->vport;
+
+  // Make subscription
+  if (snd_seq_port_subscribe_malloc( &data->subscription ) < 0) {
+    snd_seq_port_subscribe_free( data->subscription );
+    errorString_ = "MidiOutAlsa::openPort: error allocating port subscription.";
+    error( RtMidiError::DRIVER_ERROR, errorString_ );
+    return;
+  }
+  snd_seq_port_subscribe_set_sender(data->subscription, &sender);
+  snd_seq_port_subscribe_set_dest(data->subscription, &receiver);
+  snd_seq_port_subscribe_set_time_update(data->subscription, 1);
+  snd_seq_port_subscribe_set_time_real(data->subscription, 1);
+  if ( snd_seq_subscribe_port(data->seq, data->subscription) ) {
+    snd_seq_port_subscribe_free( data->subscription );
+    errorString_ = "MidiOutAlsa::openPort: ALSA error making port connection.";
+    error( RtMidiError::DRIVER_ERROR, errorString_ );
+    return;
+  }
+
+  connected_ = true;
+}
+
+void MidiOutAlsa :: closePort( void )
+{
+  if ( connected_ ) {
+    AlsaMidiData *data = static_cast<AlsaMidiData *> (apiData_);
+    snd_seq_unsubscribe_port( data->seq, data->subscription );
+    snd_seq_port_subscribe_free( data->subscription );
+    connected_ = false;
+  }
+}
+
+void MidiOutAlsa :: openVirtualPort( std::string portName )
+{
+  AlsaMidiData *data = static_cast<AlsaMidiData *> (apiData_);
+  if ( data->vport < 0 ) {
+    data->vport = snd_seq_create_simple_port( data->seq, portName.c_str(),
+                                              SND_SEQ_PORT_CAP_READ|SND_SEQ_PORT_CAP_SUBS_READ,
+                                              SND_SEQ_PORT_TYPE_MIDI_GENERIC|SND_SEQ_PORT_TYPE_APPLICATION );
+
+    if ( data->vport < 0 ) {
+      errorString_ = "MidiOutAlsa::openVirtualPort: ALSA error creating virtual port.";
+      error( RtMidiError::DRIVER_ERROR, errorString_ );
+    }
+  }
+}
+
+void MidiOutAlsa :: sendMessage( std::vector<unsigned char> *message )
+{
+  int result;
+  AlsaMidiData *data = static_cast<AlsaMidiData *> (apiData_);
+  unsigned int nBytes = message->size();
+  if ( nBytes > data->bufferSize ) {
+    data->bufferSize = nBytes;
+    result = snd_midi_event_resize_buffer ( data->coder, nBytes);
+    if ( result != 0 ) {
+      errorString_ = "MidiOutAlsa::sendMessage: ALSA error resizing MIDI event buffer.";
+      error( RtMidiError::DRIVER_ERROR, errorString_ );
+      return;
+    }
+    free (data->buffer);
+    data->buffer = (unsigned char *) malloc( data->bufferSize );
+    if ( data->buffer == NULL ) {
+    errorString_ = "MidiOutAlsa::initialize: error allocating buffer memory!\n\n";
+    error( RtMidiError::MEMORY_ERROR, errorString_ );
+    return;
+    }
+  }
+
+  snd_seq_event_t ev;
+  snd_seq_ev_clear(&ev);
+  snd_seq_ev_set_source(&ev, data->vport);
+  snd_seq_ev_set_subs(&ev);
+  snd_seq_ev_set_direct(&ev);
+  for ( unsigned int i=0; i<nBytes; ++i ) data->buffer[i] = message->at(i);
+  result = snd_midi_event_encode( data->coder, data->buffer, (long)nBytes, &ev );
+  if ( result < (int)nBytes ) {
+    errorString_ = "MidiOutAlsa::sendMessage: event parsing error!";
+    error( RtMidiError::WARNING, errorString_ );
+    return;
+  }
+
+  // Send the event.
+  result = snd_seq_event_output(data->seq, &ev);
+  if ( result < 0 ) {
+    errorString_ = "MidiOutAlsa::sendMessage: error sending MIDI message to port.";
+    error( RtMidiError::WARNING, errorString_ );
+    return;
+  }
+  snd_seq_drain_output(data->seq);
+}
+
+#endif // __LINUX_ALSA__
+
+
+//*********************************************************************//
+//  API: Windows Multimedia Library (MM)
+//*********************************************************************//
+
+// API information deciphered from:
+//  - http://msdn.microsoft.com/library/default.asp?url=/library/en-us/multimed/htm/_win32_midi_reference.asp
+
+// Thanks to Jean-Baptiste Berruchon for the sysex code.
+
+#if defined(__WINDOWS_MM__)
+
+// The Windows MM API is based on the use of a callback function for
+// MIDI input.  We convert the system specific time stamps to delta
+// time values.
+
+// Windows MM MIDI header files.
+#include <windows.h>
+#include <mmsystem.h>
+
+#define  RT_SYSEX_BUFFER_SIZE 1024
+#define  RT_SYSEX_BUFFER_COUNT 4
+
+// A structure to hold variables related to the CoreMIDI API
+// implementation.
+struct WinMidiData {
+  HMIDIIN inHandle;    // Handle to Midi Input Device
+  HMIDIOUT outHandle;  // Handle to Midi Output Device
+  DWORD lastTime;
+  MidiInApi::MidiMessage message;
+  LPMIDIHDR sysexBuffer[RT_SYSEX_BUFFER_COUNT];
+  CRITICAL_SECTION _mutex; // [Patrice] see https://groups.google.com/forum/#!topic/mididev/6OUjHutMpEo
+};
+
+//*********************************************************************//
+//  API: Windows MM
+//  Class Definitions: MidiInWinMM
+//*********************************************************************//
+
+static void CALLBACK midiInputCallback( HMIDIIN /*hmin*/,
+                                        UINT inputStatus, 
+                                        DWORD_PTR instancePtr,
+                                        DWORD_PTR midiMessage,
+                                        DWORD timestamp )
+{
+  if ( inputStatus != MIM_DATA && inputStatus != MIM_LONGDATA && inputStatus != MIM_LONGERROR ) return;
+
+  //MidiInApi::RtMidiInData *data = static_cast<MidiInApi::RtMidiInData *> (instancePtr);
+  MidiInApi::RtMidiInData *data = (MidiInApi::RtMidiInData *)instancePtr;
+  WinMidiData *apiData = static_cast<WinMidiData *> (data->apiData);
+
+  // Calculate time stamp.
+  if ( data->firstMessage == true ) {
+    apiData->message.timeStamp = 0.0;
+    data->firstMessage = false;
+  }
+  else apiData->message.timeStamp = (double) ( timestamp - apiData->lastTime ) * 0.001;
+  apiData->lastTime = timestamp;
+
+  if ( inputStatus == MIM_DATA ) { // Channel or system message
+
+    // Make sure the first byte is a status byte.
+    unsigned char status = (unsigned char) (midiMessage & 0x000000FF);
+    if ( !(status & 0x80) ) return;
+
+    // Determine the number of bytes in the MIDI message.
+    unsigned short nBytes = 1;
+    if ( status < 0xC0 ) nBytes = 3;
+    else if ( status < 0xE0 ) nBytes = 2;
+    else if ( status < 0xF0 ) nBytes = 3;
+    else if ( status == 0xF1 ) {
+      if ( data->ignoreFlags & 0x02 ) return;
+      else nBytes = 2;
+    }
+    else if ( status == 0xF2 ) nBytes = 3;
+    else if ( status == 0xF3 ) nBytes = 2;
+    else if ( status == 0xF8 && (data->ignoreFlags & 0x02) ) {
+      // A MIDI timing tick message and we're ignoring it.
+      return;
+    }
+    else if ( status == 0xFE && (data->ignoreFlags & 0x04) ) {
+      // A MIDI active sensing message and we're ignoring it.
+      return;
+    }
+
+    // Copy bytes to our MIDI message.
+    unsigned char *ptr = (unsigned char *) &midiMessage;
+    for ( int i=0; i<nBytes; ++i ) apiData->message.bytes.push_back( *ptr++ );
+  }
+  else { // Sysex message ( MIM_LONGDATA or MIM_LONGERROR )
+    MIDIHDR *sysex = ( MIDIHDR *) midiMessage; 
+    if ( !( data->ignoreFlags & 0x01 ) && inputStatus != MIM_LONGERROR ) {  
+      // Sysex message and we're not ignoring it
+      for ( int i=0; i<(int)sysex->dwBytesRecorded; ++i )
+        apiData->message.bytes.push_back( sysex->lpData[i] );
+    }
+
+    // The WinMM API requires that the sysex buffer be requeued after
+    // input of each sysex message.  Even if we are ignoring sysex
+    // messages, we still need to requeue the buffer in case the user
+    // decides to not ignore sysex messages in the future.  However,
+    // it seems that WinMM calls this function with an empty sysex
+    // buffer when an application closes and in this case, we should
+    // avoid requeueing it, else the computer suddenly reboots after
+    // one or two minutes.
+    if ( apiData->sysexBuffer[sysex->dwUser]->dwBytesRecorded > 0 ) {
+      //if ( sysex->dwBytesRecorded > 0 ) {
+      EnterCriticalSection( &(apiData->_mutex) );
+      MMRESULT result = midiInAddBuffer( apiData->inHandle, apiData->sysexBuffer[sysex->dwUser], sizeof(MIDIHDR) );
+      LeaveCriticalSection( &(apiData->_mutex) );
+      if ( result != MMSYSERR_NOERROR )
+        std::cerr << "\nRtMidiIn::midiInputCallback: error sending sysex to Midi device!!\n\n";
+
+      if ( data->ignoreFlags & 0x01 ) return;
+    }
+    else return;
+  }
+
+  if ( data->usingCallback ) {
+    RtMidiIn::RtMidiCallback callback = (RtMidiIn::RtMidiCallback) data->userCallback;
+    callback( apiData->message.timeStamp, &apiData->message.bytes, data->userData );
+  }
+  else {
+    // As long as we haven't reached our queue size limit, push the message.
+    if ( data->queue.size < data->queue.ringSize ) {
+      data->queue.ring[data->queue.back++] = apiData->message;
+      if ( data->queue.back == data->queue.ringSize )
+        data->queue.back = 0;
+      data->queue.size++;
+    }
+    else
+      std::cerr << "\nRtMidiIn: message queue limit reached!!\n\n";
+  }
+
+  // Clear the vector for the next input message.
+  apiData->message.bytes.clear();
+}
+
+MidiInWinMM :: MidiInWinMM( const std::string clientName, unsigned int queueSizeLimit ) : MidiInApi( queueSizeLimit )
+{
+  initialize( clientName );
+}
+
+MidiInWinMM :: ~MidiInWinMM()
+{
+  // Close a connection if it exists.
+  closePort();
+
+  WinMidiData *data = static_cast<WinMidiData *> (apiData_);
+  DeleteCriticalSection( &(data->_mutex) );
+
+  // Cleanup.
+  delete data;
+}
+
+void MidiInWinMM :: initialize( const std::string& /*clientName*/ )
+{
+  // We'll issue a warning here if no devices are available but not
+  // throw an error since the user can plugin something later.
+  unsigned int nDevices = midiInGetNumDevs();
+  if ( nDevices == 0 ) {
+    errorString_ = "MidiInWinMM::initialize: no MIDI input devices currently available.";
+    error( RtMidiError::WARNING, errorString_ );
+  }
+
+  // Save our api-specific connection information.
+  WinMidiData *data = (WinMidiData *) new WinMidiData;
+  apiData_ = (void *) data;
+  inputData_.apiData = (void *) data;
+  data->message.bytes.clear();  // needs to be empty for first input message
+
+  if ( !InitializeCriticalSectionAndSpinCount(&(data->_mutex), 0x00000400) ) {
+    errorString_ = "MidiInWinMM::initialize: InitializeCriticalSectionAndSpinCount failed.";
+    error( RtMidiError::WARNING, errorString_ );
+  }
+}
+
+void MidiInWinMM :: openPort( unsigned int portNumber, const std::string /*portName*/ )
+{
+  if ( connected_ ) {
+    errorString_ = "MidiInWinMM::openPort: a valid connection already exists!";
+    error( RtMidiError::WARNING, errorString_ );
+    return;
+  }
+
+  unsigned int nDevices = midiInGetNumDevs();
+  if (nDevices == 0) {
+    errorString_ = "MidiInWinMM::openPort: no MIDI input sources found!";
+    error( RtMidiError::NO_DEVICES_FOUND, errorString_ );
+    return;
+  }
+
+  if ( portNumber >= nDevices ) {
+    std::ostringstream ost;
+    ost << "MidiInWinMM::openPort: the 'portNumber' argument (" << portNumber << ") is invalid.";
+    errorString_ = ost.str();
+    error( RtMidiError::INVALID_PARAMETER, errorString_ );
+    return;
+  }
+
+  WinMidiData *data = static_cast<WinMidiData *> (apiData_);
+  MMRESULT result = midiInOpen( &data->inHandle,
+                                portNumber,
+                                (DWORD_PTR)&midiInputCallback,
+                                (DWORD_PTR)&inputData_,
+                                CALLBACK_FUNCTION );
+  if ( result != MMSYSERR_NOERROR ) {
+    errorString_ = "MidiInWinMM::openPort: error creating Windows MM MIDI input port.";
+    error( RtMidiError::DRIVER_ERROR, errorString_ );
+    return;
+  }
+
+  // Allocate and init the sysex buffers.
+  for ( int i=0; i<RT_SYSEX_BUFFER_COUNT; ++i ) {
+    data->sysexBuffer[i] = (MIDIHDR*) new char[ sizeof(MIDIHDR) ];
+    data->sysexBuffer[i]->lpData = new char[ RT_SYSEX_BUFFER_SIZE ];
+    data->sysexBuffer[i]->dwBufferLength = RT_SYSEX_BUFFER_SIZE;
+    data->sysexBuffer[i]->dwUser = i; // We use the dwUser parameter as buffer indicator
+    data->sysexBuffer[i]->dwFlags = 0;
+
+    result = midiInPrepareHeader( data->inHandle, data->sysexBuffer[i], sizeof(MIDIHDR) );
+    if ( result != MMSYSERR_NOERROR ) {
+      midiInClose( data->inHandle );
+      errorString_ = "MidiInWinMM::openPort: error starting Windows MM MIDI input port (PrepareHeader).";
+      error( RtMidiError::DRIVER_ERROR, errorString_ );
+      return;
+    }
+
+    // Register the buffer.
+    result = midiInAddBuffer( data->inHandle, data->sysexBuffer[i], sizeof(MIDIHDR) );
+    if ( result != MMSYSERR_NOERROR ) {
+      midiInClose( data->inHandle );
+      errorString_ = "MidiInWinMM::openPort: error starting Windows MM MIDI input port (AddBuffer).";
+      error( RtMidiError::DRIVER_ERROR, errorString_ );
+      return;
+    }
+  }
+
+  result = midiInStart( data->inHandle );
+  if ( result != MMSYSERR_NOERROR ) {
+    midiInClose( data->inHandle );
+    errorString_ = "MidiInWinMM::openPort: error starting Windows MM MIDI input port.";
+    error( RtMidiError::DRIVER_ERROR, errorString_ );
+    return;
+  }
+
+  connected_ = true;
+}
+
+void MidiInWinMM :: openVirtualPort( std::string /*portName*/ )
+{
+  // This function cannot be implemented for the Windows MM MIDI API.
+  errorString_ = "MidiInWinMM::openVirtualPort: cannot be implemented in Windows MM MIDI API!";
+  error( RtMidiError::WARNING, errorString_ );
+}
+
+void MidiInWinMM :: closePort( void )
+{
+  if ( connected_ ) {
+    WinMidiData *data = static_cast<WinMidiData *> (apiData_);
+    EnterCriticalSection( &(data->_mutex) );
+    midiInReset( data->inHandle );
+    midiInStop( data->inHandle );
+
+    for ( int i=0; i<RT_SYSEX_BUFFER_COUNT; ++i ) {
+      int result = midiInUnprepareHeader(data->inHandle, data->sysexBuffer[i], sizeof(MIDIHDR));
+      delete [] data->sysexBuffer[i]->lpData;
+      delete [] data->sysexBuffer[i];
+      if ( result != MMSYSERR_NOERROR ) {
+        midiInClose( data->inHandle );
+        errorString_ = "MidiInWinMM::openPort: error closing Windows MM MIDI input port (midiInUnprepareHeader).";
+        error( RtMidiError::DRIVER_ERROR, errorString_ );
+        return;
+      }
+    }
+
+    midiInClose( data->inHandle );
+    connected_ = false;
+    LeaveCriticalSection( &(data->_mutex) );
+  }
+}
+
+unsigned int MidiInWinMM :: getPortCount()
+{
+  return midiInGetNumDevs();
+}
+
+std::string MidiInWinMM :: getPortName( unsigned int portNumber )
+{
+  std::string stringName;
+  unsigned int nDevices = midiInGetNumDevs();
+  if ( portNumber >= nDevices ) {
+    std::ostringstream ost;
+    ost << "MidiInWinMM::getPortName: the 'portNumber' argument (" << portNumber << ") is invalid.";
+    errorString_ = ost.str();
+    error( RtMidiError::WARNING, errorString_ );
+    return stringName;
+  }
+
+  MIDIINCAPS deviceCaps;
+  midiInGetDevCaps( portNumber, &deviceCaps, sizeof(MIDIINCAPS));
+
+#if defined( UNICODE ) || defined( _UNICODE )
+  int length = WideCharToMultiByte(CP_UTF8, 0, deviceCaps.szPname, -1, NULL, 0, NULL, NULL) - 1;
+  stringName.assign( length, 0 );
+  length = WideCharToMultiByte(CP_UTF8, 0, deviceCaps.szPname, static_cast<int>(wcslen(deviceCaps.szPname)), &stringName[0], length, NULL, NULL);
+#else
+  stringName = std::string( deviceCaps.szPname );
+#endif
+
+  // Next lines added to add the portNumber to the name so that 
+  // the device's names are sure to be listed with individual names
+  // even when they have the same brand name
+  std::ostringstream os;
+  os << " ";
+  os << portNumber;
+  stringName += os.str();
+
+  return stringName;
+}
+
+//*********************************************************************//
+//  API: Windows MM
+//  Class Definitions: MidiOutWinMM
+//*********************************************************************//
+
+MidiOutWinMM :: MidiOutWinMM( const std::string clientName ) : MidiOutApi()
+{
+  initialize( clientName );
+}
+
+MidiOutWinMM :: ~MidiOutWinMM()
+{
+  // Close a connection if it exists.
+  closePort();
+
+  // Cleanup.
+  WinMidiData *data = static_cast<WinMidiData *> (apiData_);
+  delete data;
+}
+
+void MidiOutWinMM :: initialize( const std::string& /*clientName*/ )
+{
+  // We'll issue a warning here if no devices are available but not
+  // throw an error since the user can plug something in later.
+  unsigned int nDevices = midiOutGetNumDevs();
+  if ( nDevices == 0 ) {
+    errorString_ = "MidiOutWinMM::initialize: no MIDI output devices currently available.";
+    error( RtMidiError::WARNING, errorString_ );
+  }
+
+  // Save our api-specific connection information.
+  WinMidiData *data = (WinMidiData *) new WinMidiData;
+  apiData_ = (void *) data;
+}
+
+unsigned int MidiOutWinMM :: getPortCount()
+{
+  return midiOutGetNumDevs();
+}
+
+std::string MidiOutWinMM :: getPortName( unsigned int portNumber )
+{
+  std::string stringName;
+  unsigned int nDevices = midiOutGetNumDevs();
+  if ( portNumber >= nDevices ) {
+    std::ostringstream ost;
+    ost << "MidiOutWinMM::getPortName: the 'portNumber' argument (" << portNumber << ") is invalid.";
+    errorString_ = ost.str();
+    error( RtMidiError::WARNING, errorString_ );
+    return stringName;
+  }
+
+  MIDIOUTCAPS deviceCaps;
+  midiOutGetDevCaps( portNumber, &deviceCaps, sizeof(MIDIOUTCAPS));
+
+#if defined( UNICODE ) || defined( _UNICODE )
+  int length = WideCharToMultiByte(CP_UTF8, 0, deviceCaps.szPname, -1, NULL, 0, NULL, NULL) - 1;
+  stringName.assign( length, 0 );
+  length = WideCharToMultiByte(CP_UTF8, 0, deviceCaps.szPname, static_cast<int>(wcslen(deviceCaps.szPname)), &stringName[0], length, NULL, NULL);
+#else
+  stringName = std::string( deviceCaps.szPname );
+#endif
+
+  // Next lines added to add the portNumber to the name so that 
+  // the device's names are sure to be listed with individual names
+  // even when they have the same brand name
+  std::ostringstream os;
+  os << " ";
+  os << portNumber;
+  stringName += os.str();
+
+  return stringName;
+}
+
+void MidiOutWinMM :: openPort( unsigned int portNumber, const std::string /*portName*/ )
+{
+  if ( connected_ ) {
+    errorString_ = "MidiOutWinMM::openPort: a valid connection already exists!";
+    error( RtMidiError::WARNING, errorString_ );
+    return;
+  }
+
+  unsigned int nDevices = midiOutGetNumDevs();
+  if (nDevices < 1) {
+    errorString_ = "MidiOutWinMM::openPort: no MIDI output destinations found!";
+    error( RtMidiError::NO_DEVICES_FOUND, errorString_ );
+    return;
+  }
+
+  if ( portNumber >= nDevices ) {
+    std::ostringstream ost;
+    ost << "MidiOutWinMM::openPort: the 'portNumber' argument (" << portNumber << ") is invalid.";
+    errorString_ = ost.str();
+    error( RtMidiError::INVALID_PARAMETER, errorString_ );
+    return;
+  }
+
+  WinMidiData *data = static_cast<WinMidiData *> (apiData_);
+  MMRESULT result = midiOutOpen( &data->outHandle,
+                                 portNumber,
+                                 (DWORD)NULL,
+                                 (DWORD)NULL,
+                                 CALLBACK_NULL );
+  if ( result != MMSYSERR_NOERROR ) {
+    errorString_ = "MidiOutWinMM::openPort: error creating Windows MM MIDI output port.";
+    error( RtMidiError::DRIVER_ERROR, errorString_ );
+    return;
+  }
+
+  connected_ = true;
+}
+
+void MidiOutWinMM :: closePort( void )
+{
+  if ( connected_ ) {
+    WinMidiData *data = static_cast<WinMidiData *> (apiData_);
+    midiOutReset( data->outHandle );
+    midiOutClose( data->outHandle );
+    connected_ = false;
+  }
+}
+
+void MidiOutWinMM :: openVirtualPort( std::string /*portName*/ )
+{
+  // This function cannot be implemented for the Windows MM MIDI API.
+  errorString_ = "MidiOutWinMM::openVirtualPort: cannot be implemented in Windows MM MIDI API!";
+  error( RtMidiError::WARNING, errorString_ );
+}
+
+void MidiOutWinMM :: sendMessage( std::vector<unsigned char> *message )
+{
+  if ( !connected_ ) return;
+
+  unsigned int nBytes = static_cast<unsigned int>(message->size());
+  if ( nBytes == 0 ) {
+    errorString_ = "MidiOutWinMM::sendMessage: message argument is empty!";
+    error( RtMidiError::WARNING, errorString_ );
+    return;
+  }
+
+  MMRESULT result;
+  WinMidiData *data = static_cast<WinMidiData *> (apiData_);
+  if ( message->at(0) == 0xF0 ) { // Sysex message
+
+    // Allocate buffer for sysex data.
+    char *buffer = (char *) malloc( nBytes );
+    if ( buffer == NULL ) {
+      errorString_ = "MidiOutWinMM::sendMessage: error allocating sysex message memory!";
+      error( RtMidiError::MEMORY_ERROR, errorString_ );
+      return;
+    }
+
+    // Copy data to buffer.
+    for ( unsigned int i=0; i<nBytes; ++i ) buffer[i] = message->at(i);
+
+    // Create and prepare MIDIHDR structure.
+    MIDIHDR sysex;
+    sysex.lpData = (LPSTR) buffer;
+    sysex.dwBufferLength = nBytes;
+    sysex.dwFlags = 0;
+    result = midiOutPrepareHeader( data->outHandle,  &sysex, sizeof(MIDIHDR) ); 
+    if ( result != MMSYSERR_NOERROR ) {
+      free( buffer );
+      errorString_ = "MidiOutWinMM::sendMessage: error preparing sysex header.";
+      error( RtMidiError::DRIVER_ERROR, errorString_ );
+      return;
+    }
+
+    // Send the message.
+    result = midiOutLongMsg( data->outHandle, &sysex, sizeof(MIDIHDR) );
+    if ( result != MMSYSERR_NOERROR ) {
+      free( buffer );
+      errorString_ = "MidiOutWinMM::sendMessage: error sending sysex message.";
+      error( RtMidiError::DRIVER_ERROR, errorString_ );
+      return;
+    }
+
+    // Unprepare the buffer and MIDIHDR.
+    while ( MIDIERR_STILLPLAYING == midiOutUnprepareHeader( data->outHandle, &sysex, sizeof (MIDIHDR) ) ) Sleep( 1 );
+    free( buffer );
+  }
+  else { // Channel or system message.
+
+    // Make sure the message size isn't too big.
+    if ( nBytes > 3 ) {
+      errorString_ = "MidiOutWinMM::sendMessage: message size is greater than 3 bytes (and not sysex)!";
+      error( RtMidiError::WARNING, errorString_ );
+      return;
+    }
+
+    // Pack MIDI bytes into double word.
+    DWORD packet;
+    unsigned char *ptr = (unsigned char *) &packet;
+    for ( unsigned int i=0; i<nBytes; ++i ) {
+      *ptr = message->at(i);
+      ++ptr;
+    }
+
+    // Send the message immediately.
+    result = midiOutShortMsg( data->outHandle, packet );
+    if ( result != MMSYSERR_NOERROR ) {
+      errorString_ = "MidiOutWinMM::sendMessage: error sending MIDI message.";
+      error( RtMidiError::DRIVER_ERROR, errorString_ );
+    }
+  }
+}
+
+#endif  // __WINDOWS_MM__
+
+
+//*********************************************************************//
+//  API: UNIX JACK
+//
+//  Written primarily by Alexander Svetalkin, with updates for delta
+//  time by Gary Scavone, April 2011.
+//
+//  *********************************************************************//
+
+#if defined(__UNIX_JACK__)
+
+// JACK header files
+#include <jack/jack.h>
+#include <jack/midiport.h>
+#include <jack/ringbuffer.h>
+
+#define JACK_RINGBUFFER_SIZE 16384 // Default size for ringbuffer
+
+struct JackMidiData {
+  jack_client_t *client;
+  jack_port_t *port;
+  jack_ringbuffer_t *buffSize;
+  jack_ringbuffer_t *buffMessage;
+  jack_time_t lastTime;
+  MidiInApi :: RtMidiInData *rtMidiIn;
+  };
+
+//*********************************************************************//
+//  API: JACK
+//  Class Definitions: MidiInJack
+//*********************************************************************//
+
+static int jackProcessIn( jack_nframes_t nframes, void *arg )
+{
+  JackMidiData *jData = (JackMidiData *) arg;
+  MidiInApi :: RtMidiInData *rtData = jData->rtMidiIn;
+  jack_midi_event_t event;
+  jack_time_t time;
+
+  // Is port created?
+  if ( jData->port == NULL ) return 0;
+  void *buff = jack_port_get_buffer( jData->port, nframes );
+
+  // We have midi events in buffer
+  int evCount = jack_midi_get_event_count( buff );
+  for (int j = 0; j < evCount; j++) {
+    MidiInApi::MidiMessage message;
+    message.bytes.clear();
+
+    jack_midi_event_get( &event, buff, j );
+
+    for ( unsigned int i = 0; i < event.size; i++ )
+      message.bytes.push_back( event.buffer[i] );
+
+    // Compute the delta time.
+    time = jack_get_time();
+    if ( rtData->firstMessage == true )
+      rtData->firstMessage = false;
+    else
+      message.timeStamp = ( time - jData->lastTime ) * 0.000001;
+
+    jData->lastTime = time;
+
+    if ( !rtData->continueSysex ) {
+      if ( rtData->usingCallback ) {
+        RtMidiIn::RtMidiCallback callback = (RtMidiIn::RtMidiCallback) rtData->userCallback;
+        callback( message.timeStamp, &message.bytes, rtData->userData );
+      }
+      else {
+        // As long as we haven't reached our queue size limit, push the message.
+        if ( rtData->queue.size < rtData->queue.ringSize ) {
+          rtData->queue.ring[rtData->queue.back++] = message;
+          if ( rtData->queue.back == rtData->queue.ringSize )
+            rtData->queue.back = 0;
+          rtData->queue.size++;
+        }
+        else
+          std::cerr << "\nMidiInJack: message queue limit reached!!\n\n";
+      }
+    }
+  }
+
+  return 0;
+}
+
+MidiInJack :: MidiInJack( const std::string clientName, unsigned int queueSizeLimit ) : MidiInApi( queueSizeLimit )
+{
+  initialize( clientName );
+}
+
+void MidiInJack :: initialize( const std::string& clientName )
+{
+  JackMidiData *data = new JackMidiData;
+  apiData_ = (void *) data;
+
+  data->rtMidiIn = &inputData_;
+  data->port = NULL;
+  data->client = NULL;
+  this->clientName = clientName;
+
+  connect();
+}
+
+void MidiInJack :: connect()
+{
+  JackMidiData *data = static_cast<JackMidiData *> (apiData_);
+  if ( data->client )
+    return;
+
+  // Initialize JACK client
+  if (( data->client = jack_client_open( clientName.c_str(), JackNoStartServer, NULL )) == 0) {
+    errorString_ = "MidiInJack::initialize: JACK server not running?";
+    error( RtMidiError::WARNING, errorString_ );
+    return;
+  }
+
+  jack_set_process_callback( data->client, jackProcessIn, data );
+  jack_activate( data->client );
+}
+
+MidiInJack :: ~MidiInJack()
+{
+  JackMidiData *data = static_cast<JackMidiData *> (apiData_);
+  closePort();
+
+  if ( data->client )
+    jack_client_close( data->client );
+  delete data;
+}
+
+void MidiInJack :: openPort( unsigned int portNumber, const std::string portName )
+{
+  JackMidiData *data = static_cast<JackMidiData *> (apiData_);
+
+  connect();
+
+  // Creating new port
+  if ( data->port == NULL)
+    data->port = jack_port_register( data->client, portName.c_str(),
+                                     JACK_DEFAULT_MIDI_TYPE, JackPortIsInput, 0 );
+
+  if ( data->port == NULL) {
+    errorString_ = "MidiInJack::openPort: JACK error creating port";
+    error( RtMidiError::DRIVER_ERROR, errorString_ );
+    return;
+  }
+
+  // Connecting to the output
+  std::string name = getPortName( portNumber );
+  jack_connect( data->client, name.c_str(), jack_port_name( data->port ) );
+}
+
+void MidiInJack :: openVirtualPort( const std::string portName )
+{
+  JackMidiData *data = static_cast<JackMidiData *> (apiData_);
+
+  connect();
+  if ( data->port == NULL )
+    data->port = jack_port_register( data->client, portName.c_str(),
+                                     JACK_DEFAULT_MIDI_TYPE, JackPortIsInput, 0 );
+
+  if ( data->port == NULL ) {
+    errorString_ = "MidiInJack::openVirtualPort: JACK error creating virtual port";
+    error( RtMidiError::DRIVER_ERROR, errorString_ );
+  }
+}
+
+unsigned int MidiInJack :: getPortCount()
+{
+  int count = 0;
+  JackMidiData *data = static_cast<JackMidiData *> (apiData_);
+  connect();
+  if ( !data->client )
+    return 0;
+
+  // List of available ports
+  const char **ports = jack_get_ports( data->client, NULL, JACK_DEFAULT_MIDI_TYPE, JackPortIsOutput );
+
+  if ( ports == NULL ) return 0;
+  while ( ports[count] != NULL )
+    count++;
+
+  free( ports );
+
+  return count;
+}
+
+std::string MidiInJack :: getPortName( unsigned int portNumber )
+{
+  JackMidiData *data = static_cast<JackMidiData *> (apiData_);
+  std::string retStr("");
+
+  connect();
+
+  // List of available ports
+  const char **ports = jack_get_ports( data->client, NULL,
+                                       JACK_DEFAULT_MIDI_TYPE, JackPortIsOutput );
+
+  // Check port validity
+  if ( ports == NULL ) {
+    errorString_ = "MidiInJack::getPortName: no ports available!";
+    error( RtMidiError::WARNING, errorString_ );
+    return retStr;
+  }
+
+  if ( ports[portNumber] == NULL ) {
+    std::ostringstream ost;
+    ost << "MidiInJack::getPortName: the 'portNumber' argument (" << portNumber << ") is invalid.";
+    errorString_ = ost.str();
+    error( RtMidiError::WARNING, errorString_ );
+  }
+  else retStr.assign( ports[portNumber] );
+
+  free( ports );
+  return retStr;
+}
+
+void MidiInJack :: closePort()
+{
+  JackMidiData *data = static_cast<JackMidiData *> (apiData_);
+
+  if ( data->port == NULL ) return;
+  jack_port_unregister( data->client, data->port );
+  data->port = NULL;
+}
+
+//*********************************************************************//
+//  API: JACK
+//  Class Definitions: MidiOutJack
+//*********************************************************************//
+
+// Jack process callback
+static int jackProcessOut( jack_nframes_t nframes, void *arg )
+{
+  JackMidiData *data = (JackMidiData *) arg;
+  jack_midi_data_t *midiData;
+  int space;
+
+  // Is port created?
+  if ( data->port == NULL ) return 0;
+
+  void *buff = jack_port_get_buffer( data->port, nframes );
+  jack_midi_clear_buffer( buff );
+
+  while ( jack_ringbuffer_read_space( data->buffSize ) > 0 ) {
+    jack_ringbuffer_read( data->buffSize, (char *) &space, (size_t) sizeof(space) );
+    midiData = jack_midi_event_reserve( buff, 0, space );
+
+    jack_ringbuffer_read( data->buffMessage, (char *) midiData, (size_t) space );
+  }
+
+  return 0;
+}
+
+MidiOutJack :: MidiOutJack( const std::string clientName ) : MidiOutApi()
+{
+  initialize( clientName );
+}
+
+void MidiOutJack :: initialize( const std::string& clientName )
+{
+  JackMidiData *data = new JackMidiData;
+  apiData_ = (void *) data;
+
+  data->port = NULL;
+  data->client = NULL;
+  this->clientName = clientName;
+
+  connect();
+}
+
+void MidiOutJack :: connect()
+{
+  JackMidiData *data = static_cast<JackMidiData *> (apiData_);
+  if ( data->client )
+    return;
+  
+  // Initialize output ringbuffers  
+  data->buffSize = jack_ringbuffer_create( JACK_RINGBUFFER_SIZE );
+  data->buffMessage = jack_ringbuffer_create( JACK_RINGBUFFER_SIZE );
+
+  // Initialize JACK client
+  if (( data->client = jack_client_open( clientName.c_str(), JackNoStartServer, NULL )) == 0) {
+    errorString_ = "MidiOutJack::initialize: JACK server not running?";
+    error( RtMidiError::WARNING, errorString_ );
+    return;
+  }
+
+  jack_set_process_callback( data->client, jackProcessOut, data );
+  jack_activate( data->client );
+}
+
+MidiOutJack :: ~MidiOutJack()
+{
+  JackMidiData *data = static_cast<JackMidiData *> (apiData_);
+  closePort();
+  
+  // Cleanup
+  jack_ringbuffer_free( data->buffSize );
+  jack_ringbuffer_free( data->buffMessage );
+  if ( data->client ) {
+    jack_client_close( data->client );
+  }
+
+  delete data;
+}
+
+void MidiOutJack :: openPort( unsigned int portNumber, const std::string portName )
+{
+  JackMidiData *data = static_cast<JackMidiData *> (apiData_);
+
+  connect();
+
+  // Creating new port
+  if ( data->port == NULL )
+    data->port = jack_port_register( data->client, portName.c_str(),
+      JACK_DEFAULT_MIDI_TYPE, JackPortIsOutput, 0 );
+
+  if ( data->port == NULL ) {
+    errorString_ = "MidiOutJack::openPort: JACK error creating port";
+    error( RtMidiError::DRIVER_ERROR, errorString_ );
+    return;
+  }
+
+  // Connecting to the output
+  std::string name = getPortName( portNumber );
+  jack_connect( data->client, jack_port_name( data->port ), name.c_str() );
+}
+
+void MidiOutJack :: openVirtualPort( const std::string portName )
+{
+  JackMidiData *data = static_cast<JackMidiData *> (apiData_);
+
+  connect();
+  if ( data->port == NULL )
+    data->port = jack_port_register( data->client, portName.c_str(),
+      JACK_DEFAULT_MIDI_TYPE, JackPortIsOutput, 0 );
+
+  if ( data->port == NULL ) {
+    errorString_ = "MidiOutJack::openVirtualPort: JACK error creating virtual port";
+    error( RtMidiError::DRIVER_ERROR, errorString_ );
+  }
+}
+
+unsigned int MidiOutJack :: getPortCount()
+{
+  int count = 0;
+  JackMidiData *data = static_cast<JackMidiData *> (apiData_);
+  connect();
+  if ( !data->client )
+    return 0;
+
+  // List of available ports
+  const char **ports = jack_get_ports( data->client, NULL,
+    JACK_DEFAULT_MIDI_TYPE, JackPortIsInput );
+
+  if ( ports == NULL ) return 0;
+  while ( ports[count] != NULL )
+    count++;
+
+  free( ports );
+
+  return count;
+}
+
+std::string MidiOutJack :: getPortName( unsigned int portNumber )
+{
+  JackMidiData *data = static_cast<JackMidiData *> (apiData_);
+  std::string retStr("");
+
+  connect();
+
+  // List of available ports
+  const char **ports = jack_get_ports( data->client, NULL,
+    JACK_DEFAULT_MIDI_TYPE, JackPortIsInput );
+
+  // Check port validity
+  if ( ports == NULL) {
+    errorString_ = "MidiOutJack::getPortName: no ports available!";
+    error( RtMidiError::WARNING, errorString_ );
+    return retStr;
+  }
+
+  if ( ports[portNumber] == NULL) {
+    std::ostringstream ost;
+    ost << "MidiOutJack::getPortName: the 'portNumber' argument (" << portNumber << ") is invalid.";
+    errorString_ = ost.str();
+    error( RtMidiError::WARNING, errorString_ );
+  }
+  else retStr.assign( ports[portNumber] );
+
+  free( ports );
+  return retStr;
+}
+
+void MidiOutJack :: closePort()
+{
+  JackMidiData *data = static_cast<JackMidiData *> (apiData_);
+
+  if ( data->port == NULL ) return;
+  jack_port_unregister( data->client, data->port );
+  data->port = NULL;
+}
+
+void MidiOutJack :: sendMessage( std::vector<unsigned char> *message )
+{
+  int nBytes = message->size();
+  JackMidiData *data = static_cast<JackMidiData *> (apiData_);
+
+  // Write full message to buffer
+  jack_ringbuffer_write( data->buffMessage, ( const char * ) &( *message )[0],
+                         message->size() );
+  jack_ringbuffer_write( data->buffSize, ( char * ) &nBytes, sizeof( nBytes ) );
+}
+
+#endif  // __UNIX_JACK__