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RtMidi.cpp
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/**********************************************************************/
/*! \class RtMidi
\brief An abstract base class for realtime MIDI input/output.
This class implements some common functionality for the realtime
MIDI input/output subclasses RtMidiIn and RtMidiOut.
RtMidi WWW site: http://music.mcgill.ca/~gary/rtmidi/
RtMidi: realtime MIDI i/o C++ classes
Copyright (c) 2003-2010 Gary P. Scavone
Permission is hereby granted, free of charge, to any person
obtaining a copy of this software and associated documentation files
(the "Software"), to deal in the Software without restriction,
including without limitation the rights to use, copy, modify, merge,
publish, distribute, sublicense, and/or sell copies of the Software,
and to permit persons to whom the Software is furnished to do so,
subject to the following conditions:
The above copyright notice and this permission notice shall be
included in all copies or substantial portions of the Software.
Any person wishing to distribute modifications to the Software is
requested to send the modifications to the original developer so that
they can be incorporated into the canonical version.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR
ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF
CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
/**********************************************************************/
// RtMidi: Version 1.0.11
#include "RtMidi.h"
#include <sstream>
//*********************************************************************//
// Common RtMidi Definitions
//*********************************************************************//
RtMidi :: RtMidi()
: apiData_( 0 ), connected_( false )
{
}
void RtMidi :: error( RtError::Type type )
{
if (type == RtError::WARNING) {
std::cerr << '\n' << errorString_ << "\n\n";
}
else if (type == RtError::DEBUG_WARNING) {
#if defined(__RTMIDI_DEBUG__)
std::cerr << '\n' << errorString_ << "\n\n";
#endif
}
else {
std::cerr << '\n' << errorString_ << "\n\n";
throw RtError( errorString_, type );
}
}
//*********************************************************************//
// Common RtMidiIn Definitions
//*********************************************************************//
RtMidiIn :: RtMidiIn( const std::string clientName ) : RtMidi()
{
this->initialize( clientName );
}
void RtMidiIn :: setCallback( RtMidiCallback callback, void *userData )
{
if ( inputData_.usingCallback ) {
errorString_ = "RtMidiIn::setCallback: a callback function is already set!";
error( RtError::WARNING );
return;
}
if ( !callback ) {
errorString_ = "RtMidiIn::setCallback: callback function value is invalid!";
error( RtError::WARNING );
return;
}
inputData_.userCallback = (void *) callback;
inputData_.userData = userData;
inputData_.usingCallback = true;
}
void RtMidiIn :: cancelCallback()
{
if ( !inputData_.usingCallback ) {
errorString_ = "RtMidiIn::cancelCallback: no callback function was set!";
error( RtError::WARNING );
return;
}
inputData_.userCallback = 0;
inputData_.userData = 0;
inputData_.usingCallback = false;
}
void RtMidiIn :: setQueueSizeLimit( unsigned int queueSize )
{
inputData_.queueLimit = queueSize;
}
void RtMidiIn :: 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 RtMidiIn :: getMessage( std::vector<unsigned char> *message )
{
message->clear();
if ( inputData_.usingCallback ) {
errorString_ = "RtMidiIn::getNextMessage: a user callback is currently set for this port.";
error( RtError::WARNING );
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.front().bytes);
message->assign( bytes->begin(), bytes->end() );
double deltaTime = inputData_.queue.front().timeStamp;
inputData_.queue.pop();
return deltaTime;
}
//*********************************************************************//
// Common RtMidiOut Definitions
//*********************************************************************//
RtMidiOut :: RtMidiOut( const std::string clientName ) : RtMidi()
{
this->initialize( clientName );
}
//*********************************************************************//
// API: Macintosh OS-X
//*********************************************************************//
// API information found at:
// - http://developer.apple.com/audio/pdf/coreaudio.pdf
#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;
};
//*********************************************************************//
// API: OS-X
// Class Definitions: RtMidiIn
//*********************************************************************//
void midiInputCallback( const MIDIPacketList *list, void *procRef, void *srcRef )
{
RtMidiIn::RtMidiInData *data = static_cast<RtMidiIn::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;
RtMidiIn::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.
message.timeStamp = 0.0;
if ( data->firstMessage )
data->firstMessage = false;
else {
time = packet->timeStamp;
time -= apiData->lastTime;
time = AudioConvertHostTimeToNanos( time );
message.timeStamp = time * 0.000000001;
}
apiData->lastTime = packet->timeStamp;
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 ( !continueSysex ) {
// If not a continuing sysex message, invoke the user callback function or queue the message.
if ( data->usingCallback && message.bytes.size() > 0 ) {
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->queueLimit > data->queue.size() )
data->queue.push( message );
else
std::cerr << "\nRtMidiIn: 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 < 0xF3 ) {
if ( status == 0xF1 && (data->ignoreFlags & 0x02) ) {
// A MIDI time code message and we're ignoring it.
size = 0;
iByte += 3;
}
else size = 3;
}
else if ( status == 0xF3 ) size = 2;
else if ( status == 0xF8 ) {
size = 1;
if ( data->ignoreFlags & 0x02 ) {
// A MIDI timing tick message and we're ignoring it.
size = 0;
iByte += 3;
}
}
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->queueLimit > data->queue.size() )
data->queue.push( message );
else
std::cerr << "\nRtMidiIn: message queue limit reached!!\n\n";
}
message.bytes.clear();
}
iByte += size;
}
}
}
packet = MIDIPacketNext(packet);
}
}
void RtMidiIn :: initialize( const std::string& clientName )
{
// Set up our client.
MIDIClientRef client;
OSStatus result = MIDIClientCreate( CFStringCreateWithCString( NULL, clientName.c_str(), kCFStringEncodingASCII ), NULL, NULL, &client );
if ( result != noErr ) {
errorString_ = "RtMidiIn::initialize: error creating OS-X MIDI client object.";
error( RtError::DRIVER_ERROR );
}
// Save our api-specific connection information.
CoreMidiData *data = (CoreMidiData *) new CoreMidiData;
data->client = client;
data->endpoint = 0;
apiData_ = (void *) data;
inputData_.apiData = (void *) data;
}
void RtMidiIn :: openPort( unsigned int portNumber, const std::string portName )
{
if ( connected_ ) {
errorString_ = "RtMidiIn::openPort: a valid connection already exists!";
error( RtError::WARNING );
return;
}
unsigned int nSrc = MIDIGetNumberOfSources();
if (nSrc < 1) {
errorString_ = "RtMidiIn::openPort: no MIDI input sources found!";
error( RtError::NO_DEVICES_FOUND );
}
std::ostringstream ost;
if ( portNumber >= nSrc ) {
ost << "RtMidiIn::openPort: the 'portNumber' argument (" << portNumber << ") is invalid.";
errorString_ = ost.str();
error( RtError::INVALID_PARAMETER );
}
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_ = "RtMidiIn::openPort: error creating OS-X MIDI input port.";
error( RtError::DRIVER_ERROR );
}
// Get the desired input source identifier.
MIDIEndpointRef endpoint = MIDIGetSource( portNumber );
if ( endpoint == 0 ) {
MIDIPortDispose( port );
MIDIClientDispose( data->client );
errorString_ = "RtMidiIn::openPort: error getting MIDI input source reference.";
error( RtError::DRIVER_ERROR );
}
// Make the connection.
result = MIDIPortConnectSource( port, endpoint, NULL );
if ( result != noErr ) {
MIDIPortDispose( port );
MIDIClientDispose( data->client );
errorString_ = "RtMidiIn::openPort: error connecting OS-X MIDI input port.";
error( RtError::DRIVER_ERROR );
}
// Save our api-specific port information.
data->port = port;
connected_ = true;
}
void RtMidiIn :: 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_ = "RtMidiIn::openVirtualPort: error creating virtual OS-X MIDI destination.";
error( RtError::DRIVER_ERROR );
}
// Save our api-specific connection information.
data->endpoint = endpoint;
}
void RtMidiIn :: closePort( void )
{
if ( connected_ ) {
CoreMidiData *data = static_cast<CoreMidiData *> (apiData_);
MIDIPortDispose( data->port );
connected_ = false;
}
}
RtMidiIn :: ~RtMidiIn()
{
// 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;
}
unsigned int RtMidiIn :: getPortCount()
{
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 = NULL;
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;
// Here, either the endpoint had no connections, or we failed to obtain names
return EndpointName( endpoint, false );
}
std::string RtMidiIn :: getPortName( unsigned int portNumber )
{
CFStringRef nameRef;
MIDIEndpointRef portRef;
std::ostringstream ost;
char name[128];
if ( portNumber >= MIDIGetNumberOfSources() ) {
ost << "RtMidiIn::getPortName: the 'portNumber' argument (" << portNumber << ") is invalid.";
errorString_ = ost.str();
error( RtError::INVALID_PARAMETER );
}
portRef = MIDIGetSource( portNumber );
nameRef = ConnectedEndpointName(portRef);
//MIDIObjectGetStringProperty( portRef, kMIDIPropertyName, &nameRef );
// modified by D. Casey Tucker 2009-03-10
CFStringGetCString( nameRef, name, sizeof(name), 0);
CFRelease( nameRef );
std::string stringName = name;
return stringName;
}
//*********************************************************************//
// API: OS-X
// Class Definitions: RtMidiOut
//*********************************************************************//
unsigned int RtMidiOut :: getPortCount()
{
return MIDIGetNumberOfDestinations();
}
std::string RtMidiOut :: getPortName( unsigned int portNumber )
{
CFStringRef nameRef;
MIDIEndpointRef portRef;
std::ostringstream ost;
char name[128];
if ( portNumber >= MIDIGetNumberOfDestinations() ) {
ost << "RtMidiOut::getPortName: the 'portNumber' argument (" << portNumber << ") is invalid.";
errorString_ = ost.str();
error( RtError::INVALID_PARAMETER );
}
portRef = MIDIGetDestination( portNumber );
nameRef = ConnectedEndpointName(portRef);
//MIDIObjectGetStringProperty( portRef, kMIDIPropertyName, &nameRef );
CFStringGetCString( nameRef, name, sizeof(name), 0);
CFRelease( nameRef );
std::string stringName = name;
return stringName;
}
void RtMidiOut :: initialize( const std::string& clientName )
{
// Set up our client.
MIDIClientRef client;
OSStatus result = MIDIClientCreate( CFStringCreateWithCString( NULL, clientName.c_str(), kCFStringEncodingASCII ), NULL, NULL, &client );
if ( result != noErr ) {
errorString_ = "RtMidiOut::initialize: error creating OS-X MIDI client object.";
error( RtError::DRIVER_ERROR );
}
// Save our api-specific connection information.
CoreMidiData *data = (CoreMidiData *) new CoreMidiData;
data->client = client;
data->endpoint = 0;
apiData_ = (void *) data;
}
void RtMidiOut :: openPort( unsigned int portNumber, const std::string portName )
{
if ( connected_ ) {
errorString_ = "RtMidiOut::openPort: a valid connection already exists!";
error( RtError::WARNING );
return;
}
unsigned int nDest = MIDIGetNumberOfDestinations();
if (nDest < 1) {
errorString_ = "RtMidiOut::openPort: no MIDI output destinations found!";
error( RtError::NO_DEVICES_FOUND );
}
std::ostringstream ost;
if ( portNumber >= nDest ) {
ost << "RtMidiOut::openPort: the 'portNumber' argument (" << portNumber << ") is invalid.";
errorString_ = ost.str();
error( RtError::INVALID_PARAMETER );
}
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_ = "RtMidiOut::openPort: error creating OS-X MIDI output port.";
error( RtError::DRIVER_ERROR );
}
// Get the desired output port identifier.
MIDIEndpointRef destination = MIDIGetDestination( portNumber );
if ( destination == 0 ) {
MIDIPortDispose( port );
MIDIClientDispose( data->client );
errorString_ = "RtMidiOut::openPort: error getting MIDI output destination reference.";
error( RtError::DRIVER_ERROR );
}
// Save our api-specific connection information.
data->port = port;
data->destinationId = destination;
connected_ = true;
}
void RtMidiOut :: closePort( void )
{
if ( connected_ ) {
CoreMidiData *data = static_cast<CoreMidiData *> (apiData_);
MIDIPortDispose( data->port );
connected_ = false;
}
}
void RtMidiOut :: openVirtualPort( std::string portName )
{
CoreMidiData *data = static_cast<CoreMidiData *> (apiData_);
if ( data->endpoint ) {
errorString_ = "RtMidiOut::openVirtualPort: a virtual output port already exists!";
error( RtError::WARNING );
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_ = "RtMidiOut::initialize: error creating OS-X virtual MIDI source.";
error( RtError::DRIVER_ERROR );
}
// Save our api-specific connection information.
data->endpoint = endpoint;
}
RtMidiOut :: ~RtMidiOut()
{
// 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 RtMidiOut :: sendMessage( std::vector<unsigned char> *message )
{
// The CoreMidi documentation indicates a maximum PackList size of
// 64K, so we may need to break long sysex messages into pieces and
// send via separate lists.
unsigned int nBytes = message->size();
if ( nBytes == 0 ) {
errorString_ = "RtMidiOut::sendMessage: no data in message argument!";
error( RtError::WARNING );
return;
}
if ( nBytes > 3 && ( message->at(0) != 0xF0 ) ) {
errorString_ = "RtMidiOut::sendMessage: message format problem ... not sysex but > 3 bytes?";
error( RtError::WARNING );
return;
}
unsigned int packetBytes, bytesLeft = nBytes;
unsigned int messageIndex = 0;
MIDITimeStamp timeStamp = AudioGetCurrentHostTime();
CoreMidiData *data = static_cast<CoreMidiData *> (apiData_);
while ( bytesLeft > 0 ) {
packetBytes = ( bytesLeft > 32736 ) ? 32736 : bytesLeft;
Byte buffer[packetBytes + 32]; // extra memory for other structure variables
MIDIPacketList *packetList = (MIDIPacketList *) buffer;
MIDIPacket *curPacket = MIDIPacketListInit( packetList );
curPacket = MIDIPacketListAdd( packetList, packetBytes+32, curPacket, timeStamp, packetBytes, (const Byte *) &message->at( messageIndex ) );
if ( !curPacket ) {
errorString_ = "RtMidiOut::sendMessage: could not allocate packet list";
error( RtError::DRIVER_ERROR );
}
messageIndex += packetBytes;
bytesLeft -= packetBytes;
// Send to any destinations that may have connected to us.
OSStatus result;
if ( data->endpoint ) {
result = MIDIReceived( data->endpoint, packetList );
if ( result != noErr ) {
errorString_ = "RtMidiOut::sendMessage: error sending MIDI to virtual destinations.";
error( RtError::WARNING );
}
}
// And send to an explicit destination port if we're connected.
if ( connected_ ) {
result = MIDISend( data->port, data->destinationId, packetList );
if ( result != noErr ) {
errorString_ = "RtMidiOut::sendMessage: error sending MIDI message to port.";
error( RtError::WARNING );
}
}
}
}
#endif // __MACOSX_CORE__
//*********************************************************************//
// API: LINUX ALSA SEQUENCER
//*********************************************************************//
// API information found at:
// - http://www.alsa-project.org/documentation.php#Library
#if defined(__LINUX_ALSASEQ__)
// 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;
int vport;
snd_seq_port_subscribe_t *subscription;
snd_midi_event_t *coder;
unsigned int bufferSize;
unsigned char *buffer;
pthread_t thread;
unsigned long long lastTime;
int queue_id; // an input queue is needed to get timestamped events
};
#define PORT_TYPE( pinfo, bits ) ((snd_seq_port_info_get_capability(pinfo) & (bits)) == (bits))
//*********************************************************************//
// API: LINUX ALSA
// Class Definitions: RtMidiIn
//*********************************************************************//
extern "C" void *alsaMidiHandler( void *ptr )
{
RtMidiIn::RtMidiInData *data = static_cast<RtMidiIn::RtMidiInData *> (ptr);
AlsaMidiData *apiData = static_cast<AlsaMidiData *> (data->apiData);
long nBytes;
unsigned long long time, lastTime;
bool continueSysex = false;
RtMidiIn::MidiMessage message;
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 << "\nRtMidiIn::alsaMidiHandler: error initializing MIDI event parser!\n\n";
return 0;
}
unsigned char *buffer = (unsigned char *) malloc( apiData->bufferSize );
if ( buffer == NULL ) {
data->doInput = false;
std::cerr << "\nRtMidiIn::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
while ( data->doInput ) {
if ( snd_seq_event_input_pending( apiData->seq, 1 ) == 0 ) {
// No data pending ... sleep a bit.
usleep( 1000 );
continue;
}
// If here, there should be data.
result = snd_seq_event_input( apiData->seq, &ev );
if ( result == -ENOSPC ) {
std::cerr << "\nRtMidiIn::alsaMidiHandler: MIDI input buffer overrun!\n\n";
continue;
}
else if ( result <= 0 ) {
std::cerr << "RtMidiIn::alsaMidiHandler: unknown MIDI input error!\n";
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();
switch ( ev->type ) {
case SND_SEQ_EVENT_PORT_SUBSCRIBED:
#if defined(__RTMIDI_DEBUG__)
std::cout << "RtMidiIn::alsaMidiHandler: port connection made!\n";
#endif
break;
case SND_SEQ_EVENT_PORT_UNSUBSCRIBED:
#if defined(__RTMIDI_DEBUG__)
std::cerr << "RtMidiIn::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 ) break;
case SND_SEQ_EVENT_TICK: // MIDI timing tick
if ( data->ignoreFlags & 0x02 ) break;
case SND_SEQ_EVENT_SENSING: // Active sensing
if ( data->ignoreFlags & 0x04 ) 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 << "\nRtMidiIn::alsaMidiHandler: error resizing buffer memory!\n\n";
break;
}
}
default:
nBytes = snd_midi_event_decode( apiData->coder, buffer, apiData->bufferSize, ev );
if ( nBytes <= 0 ) {
#if defined(__RTMIDI_DEBUG__)
std::cerr << "\nRtMidiIn::alsaMidiHandler: event parsing error or not a MIDI event!\n\n";
#endif
break;
}
// 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 )
break;
// 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;
}
snd_seq_free_event(ev);
if ( message.bytes.size() == 0 ) continue;
if ( data->usingCallback && !continueSysex ) {
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->queueLimit > data->queue.size() )
data->queue.push( message );
else
std::cerr << "\nRtMidiIn: message queue limit reached!!\n\n";
}
}
if ( buffer ) free( buffer );
snd_midi_event_free( apiData->coder );
apiData->coder = 0;
return 0;
}
void RtMidiIn :: 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_ = "RtMidiIn::initialize: error creating ALSA sequencer input client object.";
error( RtError::DRIVER_ERROR );
}