added new style midi drivers using QuickTime (MacOS 9 & X) and CoreAudio (MacOS X)

svn-id: r4086

2 files changed, 271 insertions, 346 deletions

diff --git a/sound/mididrv.cpp b/sound/mididrv.cpp
index e1b7950fa5..50d891ae75 100644
--- a/sound/mididrv.cpp
+++ b/sound/mididrv.cpp
@@ -288,9 +288,6 @@ private:
 	StreamCallback *_stream_proc;
 	void  *_stream_param;
 	int 	 _mode;
-	uint16 _time_div;
-
-	uint32 property(int prop, uint32 param);
 };
 
 void MidiDriver_AMIDI::set_stream_callback(void *param, StreamCallback *sc) {
@@ -330,17 +327,6 @@ void MidiDriver_AMIDI::pause(bool pause) {
 	}
 }
 
-uint32 MidiDriver_AMIDI::property(int prop, uint32 param) {
-	switch(prop) {
-	/* 16-bit time division according to standard midi specification */
-	case PROP_TIMEDIV:
-		_time_div = (uint16)param;
-		return 1;
-	}
-
-	return 0;
-}
-
 MidiDriver *MidiDriver_AMIDI_create() {
 	return new MidiDriver_AMIDI();
 }
@@ -366,9 +352,7 @@ private:
 	StreamCallback *_stream_proc;
 	void  *_stream_param;
 	int 	 _mode;
-	uint16 _time_div;
 	int device;
-	uint32 property(int prop, uint32 param);
 };
 
 MidiDriver_SEQ::MidiDriver_SEQ(){
@@ -469,20 +453,19 @@ void MidiDriver_SEQ::destroy() {
 	delete this;
 }
 
-uint32 MidiDriver_SEQ::property(int prop, uint32 param) {
-	switch(prop) {
-	/* 16-bit time division according to standard midi specification */
-	case PROP_TIMEDIV:
-		_time_div = (uint16)param;
-		return 1;
-	}
-
-	return 0;
-}
 #endif
 
-/* NULL driver */
-class MidiDriver_NULL : public MidiDriver {
+#if defined(__APPLE__) || defined(__APPLE_CW)
+// FIXME - this is for Mac OS X and Mac OS 9. It's not really possible
+// to check for these *cleanly* without a configure script, though..
+
+#include <QuickTime/QuickTimeComponents.h>
+#include <QuickTime/QuickTimeMusic.h>
+
+
+
+/* QuickTime MIDI driver */
+class MidiDriver_QT : public MidiDriver {
 public:
 	void destroy();
 	int open(int mode);
@@ -490,264 +473,37 @@ public:
 	void send(uint32 b);
 	void pause(bool pause);
 	void set_stream_callback(void *param, StreamCallback *sc);
-	uint32 property(int prop, uint32 param);
-private:
-};
-
-int MidiDriver_NULL::open(int mode) {
-	warning("Music not enabled - MIDI support selected with no MIDI driver available. Try Adlib");
-	return 0;
-}
-void MidiDriver_NULL::close() {}
-void MidiDriver_NULL::destroy() {}
-void MidiDriver_NULL::send(uint32 b) {}
-void MidiDriver_NULL::pause(bool pause) {}
-void MidiDriver_NULL::set_stream_callback(void *param, StreamCallback *sc) {}
-uint32 MidiDriver_NULL::property(int prop, uint32 param) { return 0; }
-
-MidiDriver *MidiDriver_NULL_create() {
-	return new MidiDriver_NULL();
-}
-
-
-/* retrieve a string representation of an error code */
-const char *MidiDriver::get_error_name(int error_code) {
-	static const char * const midi_errors[] = {
-		"No error",
-		"Cannot connect",
-		"Streaming not available",
-		"Device not available",
-		"Driver already open"
-	};
-	
-	if ((uint)error_code >= ARRAYSIZE(midi_errors))
-		return "Unknown Error";
-	return midi_errors[error_code];
-}
-
-
-
-
-
-
-
-
-#if 0
-
-
-void MidiDriver::midiInit()
-{
-	if (MidiInitialized != true) {
-		switch (DeviceType) {
-		case MIDI_NULL:
-			midiInitNull();
-			break;
-		case MIDI_WINDOWS:
-			midiInitWindows();
-			break;
-		case MIDI_TIMIDITY:
-			midiInitTimidity();
-			break;
-		case MIDI_SEQ:
-			midiInitSeq();
-			break;
-		case MIDI_QTMUSIC:
-			midiInitQuicktime();
-			break;
-		case MIDI_AMIDI:
-			break;
-		default:
-			DeviceType = 0;
-			midiInitNull();
-			break;
-		}
-		MidiInitialized = true;
-	} else {
-		error("Midi driver already initialized");
-	}
-}
-
-void MidiDriver::MidiOut(int b)
-{
-	if (MidiInitialized != true)
-		midiInit();
-
-	if (MidiInitialized == true) {
-		switch (DeviceType) {
-		case MIDI_NULL:
-			break;
-		case MIDI_WINDOWS:
-			MidiOutWindows(_mo, b);
-			break;
-		case MIDI_TIMIDITY:
-		case MIDI_SEQ:
-			MidiOutSeq(_mo, b);
-			break;
-		case MIDI_QTMUSIC:
-			MidiOutQuicktime(_mo, b);
-			break;
-		case MIDI_AMIDI:
-			MidiOutMorphOS(_mo, b);
-			break;
-		default:
-			error("Invalid midi device type ");
-			break;
-		}
-	} else {
-		warning("Trying to write midi data without the driver being initialized");
-	}
-}
-
-/*********** Windows			*/
-void MidiDriver::midiInitWindows()
-{
-#ifdef WIN32
-	if (midiOutOpen((HMIDIOUT *) & _mo, MIDI_MAPPER, NULL, NULL, 0) !=
-			MMSYSERR_NOERROR)
-		error("midiOutOpen failed");
-#endif
-}
-
-void MidiDriver::MidiOutWindows(void *a, int b)
-{
-#ifdef WIN32
-	midiOutShortMsg((HMIDIOUT) a, b);
-#endif
-}
-
-/*********** Raw midi support	*/
-void MidiDriver::midiInitSeq()
-{
-	int device = open_sequencer_device();
-	_mo = (void *)device;
-}
-
-int MidiDriver::open_sequencer_device()
-{
-	int device = 0;
-#if !defined(__APPLE__CW)				// No getenv support on Apple Carbon
-	char *device_name = getenv("SCUMMVM_MIDI");
-	if (device_name != NULL) {
-		device = (open((device_name), O_RDWR, 0));
-	} else {
-		warning
-			("You need to set-up the SCUMMVM_MIDI environment variable properly (see readme.txt) ");
-	}
-	if ((device_name == NULL) || (device < 0)) {
-		if (device_name == NULL)
-			warning("Opening /dev/null (no music will be heard) ");
-		else
-			warning
-				("Cannot open rawmidi device %s - using /dev/null (no music will be heard) ",
-				 device_name);
-		device = (open(("/dev/null"), O_RDWR, 0));
-		if (device < 0)
-			error("Cannot open /dev/null to dump midi output");
-	}
-#endif
-	return device;
-}
-
-/*********** Timidity		*/
-int MidiDriver::connect_to_timidity(int port)
-{
-	int s = 0;
-#if !defined(__APPLE__CW) && !defined(__MORPHOS__)	// No socket support on Apple Carbon or Morphos
-	struct hostent *serverhost;
-	struct sockaddr_in sadd;
-
-	serverhost = gethostbyname("localhost");
-	if (serverhost == NULL)
-		error("Could not resolve Timidity host ('localhost')");
-
-	sadd.sin_family = serverhost->h_addrtype;
-	sadd.sin_port = htons(port);
-	memcpy(&(sadd.sin_addr), serverhost->h_addr_list[0], serverhost->h_length);
-
-	s = socket(AF_INET, SOCK_STREAM, 0);
-	if (s < 0)
-		error("Could not open Timidity socket");
-
-	if (connect(s, (struct sockaddr *)&sadd, sizeof(struct sockaddr_in)) < 0)
-		error("Could not connect to Timidity server");
-#endif
-	return s;
-}
 
-void MidiDriver::midiInitTimidity()
-{
-	int s, s2;
-	int len;
-	int dummy, newport;
-	char buf[256];
-
-	s = connect_to_timidity(7777);
-	len = read(s, buf, 256);			// buf[len] = '\0'; printf("%s", buf);
-	sprintf(buf, "SETBUF %f %f\n", 0.1, 0.15);
-	write(s, buf, strlen(buf));
-	len = read(s, buf, 256);			// buf[len] = '\0'; printf("%s", buf); 
-
-	sprintf(buf, "OPEN lsb\n");
-	write(s, buf, strlen(buf));
-	len = read(s, buf, 256);			// buf[len] = '\0'; printf("%s", buf); 
+private:
+	NoteAllocator qtNoteAllocator;
+	NoteChannel qtNoteChannel[16];
+	NoteRequest simpleNoteRequest;
 
-	sscanf(buf, "%d %d", &dummy, &newport);
-	printf("	 => port = %d\n", newport);
+	StreamCallback *_stream_proc;
+	void  *_stream_param;
+	int 	 _mode;
+};
 
-	s2 = connect_to_timidity(newport);
-	_mo = (void *)s2;
+void MidiDriver_QT::set_stream_callback(void *param, StreamCallback *sc) {
+	_stream_param = param;
+	_stream_proc = sc;
 }
 
-void MidiDriver::MidiOutSeq(void *a, int b)
+void MidiDriver_QT::destroy()
 {
-	int s = (int)a;
-	unsigned char buf[256];
-	int position = 0;
-
-	switch (b & 0xF0) {
-	case 0x80:
-	case 0x90:
-	case 0xA0:
-	case 0xB0:
-	case 0xE0:
-		buf[position++] = SEQ_MIDIPUTC;
-		buf[position++] = b;
-		buf[position++] = DEVICE_NUM;
-		buf[position++] = 0;
-		buf[position++] = SEQ_MIDIPUTC;
-		buf[position++] = (b >> 8) & 0x7F;
-		buf[position++] = DEVICE_NUM;
-		buf[position++] = 0;
-		buf[position++] = SEQ_MIDIPUTC;
-		buf[position++] = (b >> 16) & 0x7F;
-		buf[position++] = DEVICE_NUM;
-		buf[position++] = 0;
-		break;
-	case 0xC0:
-	case 0xD0:
-		buf[position++] = SEQ_MIDIPUTC;
-		buf[position++] = b;
-		buf[position++] = DEVICE_NUM;
-		buf[position++] = 0;
-		buf[position++] = SEQ_MIDIPUTC;
-		buf[position++] = (b >> 8) & 0x7F;
-		buf[position++] = DEVICE_NUM;
-		buf[position++] = 0;
-		break;
-	default:
-		fprintf(stderr, "Unknown : %08x\n", b);
-		break;
-	}
-	write(s, buf, position);
+	close();
+	delete this;
 }
 
-/* Quicktime music support */
-void MidiDriver::midiInitQuicktime()
-{
-#ifdef __APPLE__CW
+int MidiDriver_QT::open(int mode) {
 	ComponentResult qtErr = noErr;
 	qtNoteAllocator = NULL;
 
+	if (mode == MO_STREAMING)
+		return MERR_STREAMING_NOT_AVAILABLE;
+
+	_mode = mode;
+
 	for (int i = 0; i < 15; i++)
 		qtNoteChannel[i] = NULL;
 
@@ -771,31 +527,51 @@ void MidiDriver::midiInitQuicktime()
 		if ((qtErr != noErr) || (qtNoteChannel == NULL))
 			goto bail;
 	}
-	return;
+	return 0;
 
 bail:
-	fprintf(stderr, "Init QT failed %x %x %d\n", qtNoteAllocator, qtNoteChannel,
-					qtErr);
+	error("Init QT failed %x %x %d\n", (int)qtNoteAllocator, (int)qtNoteChannel,
+					(int)qtErr);
 	for (int i = 0; i < 15; i++) {
 		if (qtNoteChannel[i] != NULL)
 			NADisposeNoteChannel(qtNoteAllocator, qtNoteChannel[i]);
+		qtNoteChannel[i] = NULL;
 	}
 
-	if (qtNoteAllocator != NULL)
+	if (qtNoteAllocator != NULL) {
 		CloseComponent(qtNoteAllocator);
-#endif
+		qtNoteAllocator = NULL;
+	}
+
+	return MERR_DEVICE_NOT_AVAILABLE;
 }
 
-void MidiDriver::MidiOutQuicktime(void *a, int b)
-{
-#ifdef __APPLE__CW
+void MidiDriver_QT::close() {
+	_mode = 0;
+
+	for (int i = 0; i < 15; i++) {
+		if (qtNoteChannel[i] != NULL)
+			NADisposeNoteChannel(qtNoteAllocator, qtNoteChannel[i]);
+		qtNoteChannel[i] = NULL;
+	}
+
+	if (qtNoteAllocator != NULL) {
+		CloseComponent(qtNoteAllocator);
+		qtNoteAllocator = NULL;
+	}
+}
+
+void MidiDriver_QT::send(uint32 b) {
+	if (_mode != MO_SIMPLE)
+		error("MidiDriver_QT:send called but driver is not in simple mode");
+
 	MusicMIDIPacket midPacket;
 	unsigned char *midiCmd = midPacket.data;
 	midPacket.length = 3;
 	midiCmd[3] = (b & 0xFF000000) >> 24;
 	midiCmd[2] = (b & 0x00FF0000) >> 16;
 	midiCmd[1] = (b & 0x0000FF00) >> 8;
-	midiCmd[0] = b;
+	midiCmd[0] = (b & 0x000000FF);
 
 	unsigned char chanID = midiCmd[0] & 0x0F;
 	switch (midiCmd[0] & 0xF0) {
@@ -804,8 +580,7 @@ void MidiDriver::MidiOutQuicktime(void *a, int b)
 		break;
 
 	case 0x90:										// Note on
-		NAPlayNote(qtNoteAllocator, qtNoteChannel[chanID], midiCmd[1],
-							 midiCmd[2]);
+		NAPlayNote(qtNoteAllocator, qtNoteChannel[chanID], midiCmd[1], midiCmd[2]);
 		break;
 
 	case 0xB0:										// Effect
@@ -846,7 +621,7 @@ void MidiDriver::MidiOutQuicktime(void *a, int b)
 			break;
 
 		default:
-			fprintf(stderr, "Unknown MIDI effect: %08x\n", b);
+			error("Unknown MIDI effect: %08x\n", (int)b);
 			break;
 		}
 		break;
@@ -864,79 +639,227 @@ void MidiDriver::MidiOutQuicktime(void *a, int b)
 		break;
 
 	default:
-		fprintf(stderr, "Unknown Command: %08x\n", b);
+		error("Unknown Command: %08x\n", (int)b);
 		NASendMIDI(qtNoteAllocator, qtNoteChannel[chanID], &midPacket);
 		break;
 	}
-#endif
 }
 
-/*********** MorphOS            */
-void MidiDriver::MidiOutMorphOS(void *a, int b)
-{
-#ifdef __MORPHOS__
-	if (ScummMidiRequest) {
-		ULONG midi_data = b;				// you never know about an int's size ;-)
-		ScummMidiRequest->amr_Std.io_Command = CMD_WRITE;
-		ScummMidiRequest->amr_Std.io_Data = &midi_data;
-		ScummMidiRequest->amr_Std.io_Length = 4;
-		DoIO((struct IORequest *)ScummMidiRequest);
-	}
-#endif
+void MidiDriver_QT::pause(bool pause) {
+}
+
+MidiDriver *MidiDriver_QT_create() {
+	return new MidiDriver_QT();
+}
+
+#endif // __APPLE__ || __APPLE_CW
+
+
+#ifdef __APPLE__
+
+#include <AudioUnit/AudioUnit.h>
+
+/* CoreAudio MIDI driver */
+/* Based on code by Benjamin W. Zale */
+class MidiDriver_CORE : public MidiDriver {
+public:
+	void destroy();
+	int open(int mode);
+	void close();
+	void send(uint32 b);
+	void pause(bool pause);
+	void set_stream_callback(void *param, StreamCallback *sc);
+
+private:
+	AudioUnit au_MusicDevice;
+
+	StreamCallback *_stream_proc;
+	void  *_stream_param;
+	int 	 _mode;
+};
+
+void MidiDriver_CORE::set_stream_callback(void *param, StreamCallback *sc) {
+	_stream_param = param;
+	_stream_proc = sc;
+}
+
+void MidiDriver_CORE::destroy() {
+	close();
+	delete this;
+}
+
+int MidiDriver_CORE::open(int mode) {
+	_mode = mode;
+	
+	AudioUnit au_output;
+	
+	int err;
+	struct AudioUnitConnection	auconnect;
+	ComponentDescription compdesc;
+	Component compid;
+	
+	au_MusicDevice=au_output=NULL;
+	
+	//Open the Music Device
+	compdesc.componentType=kAudioUnitComponentType;
+	compdesc.componentSubType=kAudioUnitSubType_MusicDevice;
+	compdesc.componentManufacturer=kAudioUnitID_DLSSynth;
+	compdesc.componentFlags=0;
+	compdesc.componentFlagsMask=0;
+	compid=FindNextComponent(NULL,&compdesc);
+	au_MusicDevice=(AudioUnit)OpenComponent(compid);
+	
+	// open the output unit
+	au_output=(AudioUnit)OpenDefaultComponent(kAudioUnitComponentType,kAudioUnitSubType_Output);
+	// connect the units
+	auconnect.sourceAudioUnit=au_MusicDevice;
+	auconnect.sourceOutputNumber=0;
+	auconnect.destInputNumber=0;
+	err=AudioUnitSetProperty(au_output,kAudioUnitProperty_MakeConnection,kAudioUnitScope_Input,0,(void*)&auconnect,sizeof(struct AudioUnitConnection));
+	// initialize the units
+	AudioUnitInitialize(au_MusicDevice);
+	AudioUnitInitialize(au_output);
+	// start the output
+	AudioOutputUnitStart(au_output);
+	
+	return 0;
+}
+
+void MidiDriver_CORE::close() {
+	_mode = 0;
+}
+
+void MidiDriver_CORE::send(uint32 b) {
+	if (_mode != MO_SIMPLE)
+		error("MidiDriver_CORE:send called but driver is not in simple mode");
+
+	unsigned char first_byte, seccond_byte, status_byte;
+	status_byte   = (b & 0x000000FF);
+	first_byte    = (b & 0x0000FF00) >> 8;
+	seccond_byte  = (b & 0x00FF0000) >> 16;
+	MusicDeviceMIDIEvent(au_MusicDevice, status_byte, first_byte, seccond_byte, 0);
+}
+
+void MidiDriver_CORE::pause(bool pause) {
+}
+
+MidiDriver *MidiDriver_CORE_create() {
+	return new MidiDriver_CORE();
+}
+
+#endif // __APPLE__
+
+/* NULL driver */
+class MidiDriver_NULL : public MidiDriver {
+public:
+	void destroy();
+	int open(int mode);
+	void close();
+	void send(uint32 b);
+	void pause(bool pause);
+	void set_stream_callback(void *param, StreamCallback *sc);
+private:
+};
+
+int MidiDriver_NULL::open(int mode) {
+	warning("Music not enabled - MIDI support selected with no MIDI driver available. Try Adlib");
+	return 0;
+}
+void MidiDriver_NULL::close() {}
+void MidiDriver_NULL::destroy() {}
+void MidiDriver_NULL::send(uint32 b) {}
+void MidiDriver_NULL::pause(bool pause) {}
+void MidiDriver_NULL::set_stream_callback(void *param, StreamCallback *sc) {}
+
+MidiDriver *MidiDriver_NULL_create() {
+	return new MidiDriver_NULL();
 }
 
 
 
-void MidiDriver::midiInitNull()
+/* Default (empty) property method */
+uint32 MidiDriver::property(int prop, uint32 param)
 {
-	warning
-		("Music not enabled - MIDI support selected with no MIDI driver available. Try Adlib");
+	return 0;
 }
 
 
+/* retrieve a string representation of an error code */
+const char *MidiDriver::get_error_name(int error_code) {
+	static const char * const midi_errors[] = {
+		"No error",
+		"Cannot connect",
+		"Streaming not available",
+		"Device not available",
+		"Driver already open"
+	};
+	
+	if ((uint)error_code >= ARRAYSIZE(midi_errors))
+		return "Unknown Error";
+	return midi_errors[error_code];
+}
 
-/* old header stuff.. */
-/* General Midi header file */
-#define SEQ_MIDIPUTC    5
-#define SPECIAL_CHANNEL 9
-#define DEVICE_NUM 0
 
 
 
-#ifdef __APPLE__CW
-	#include <QuickTimeComponents.h>
-	#include "QuickTimeMusic.h"
 
-	NoteAllocator qtNoteAllocator;
-	NoteChannel qtNoteChannel[16];
-	NoteRequest simpleNoteRequest;
-#endif
 
-#ifdef WIN32
-	#include <winsock.h>
-#elif (defined(UNIX) || defined(UNIX_X11))
-	#include <sys/time.h>
-	#include <unistd.h>
-	#include <sys/types.h>
-	#include <sys/socket.h>
-	#include <netinet/in.h>
-	#include <netdb.h>
-	#include <stdio.h>
-	#include <stdlib.h>
-	#include <string.h>
-#endif
+#if 0
+
+/* Old code for timidity support, maybe somebody can rewrite this for the 
+   new midi driver system?
+ */
 
-#ifdef __MORPHOS__
-	#include <exec/types.h>
-	#include <devices/amidi.h>
 
-	#define NO_PPCINLINE_STDARG
-	#define NO_PPCINLINE_VARARGS
-	#include <clib/alib_protos.h>
-	#include <proto/exec.h>
-	#undef CMD_INVALID
+/*********** Timidity		*/
+int MidiDriver::connect_to_timidity(int port)
+{
+	int s = 0;
+#if !defined(__APPLE__CW) && !defined(__MORPHOS__)	// No socket support on Apple Carbon or Morphos
+	struct hostent *serverhost;
+	struct sockaddr_in sadd;
+
+	serverhost = gethostbyname("localhost");
+	if (serverhost == NULL)
+		error("Could not resolve Timidity host ('localhost')");
 
-	extern struct IOMidiRequest *ScummMidiRequest;
+	sadd.sin_family = serverhost->h_addrtype;
+	sadd.sin_port = htons(port);
+	memcpy(&(sadd.sin_addr), serverhost->h_addr_list[0], serverhost->h_length);
+
+	s = socket(AF_INET, SOCK_STREAM, 0);
+	if (s < 0)
+		error("Could not open Timidity socket");
+
+	if (connect(s, (struct sockaddr *)&sadd, sizeof(struct sockaddr_in)) < 0)
+		error("Could not connect to Timidity server");
 #endif
+	return s;
+}
+
+void MidiDriver::midiInitTimidity()
+{
+	int s, s2;
+	int len;
+	int dummy, newport;
+	char buf[256];
+
+	s = connect_to_timidity(7777);
+	len = read(s, buf, 256);			// buf[len] = '\0'; printf("%s", buf);
+	sprintf(buf, "SETBUF %f %f\n", 0.1, 0.15);
+	write(s, buf, strlen(buf));
+	len = read(s, buf, 256);			// buf[len] = '\0'; printf("%s", buf); 
+
+	sprintf(buf, "OPEN lsb\n");
+	write(s, buf, strlen(buf));
+	len = read(s, buf, 256);			// buf[len] = '\0'; printf("%s", buf); 
+
+	sscanf(buf, "%d %d", &dummy, &newport);
+	printf("	 => port = %d\n", newport);
+
+	s2 = connect_to_timidity(newport);
+	_mo = (void *)s2;
+}
+
 
 #endif /* 0 */
diff --git a/sound/mididrv.h b/sound/mididrv.h
index 693226b612..61bd13d5ef 100644
--- a/sound/mididrv.h
+++ b/sound/mididrv.h
@@ -66,7 +66,7 @@ public:
 
 	
 	/* destroy the midi object */
-	virtual void destroy() = 0;
+//	virtual void destroy() = 0;
 
 	/* open the midi driver.
 	 * returns 0 if successful.
@@ -91,7 +91,7 @@ public:
 
 
 	/* Get or set a property */
-	virtual uint32 property(int prop, uint32 param) = 0;
+	virtual uint32 property(int prop, uint32 param) ;
 
 	/* retrieve a string representation of an error code */
 	static const char *get_error_name(int error_code);
@@ -108,14 +108,16 @@ enum {
 	MD_SEQ = 4,
 	MD_QTMUSIC = 5,
 	MD_AMIDI = 6,
+	MD_COREAUDIO = 7,
 };
 
 
 /* Factory functions => no need to include the specific classes
  * in this header => faster compile */
-MidiDriver *MidiDriver_NULL_create();
-MidiDriver *MidiDriver_WIN_create();
-MidiDriver *MidiDriver_TIMIDITY_create();
-MidiDriver *MidiDriver_SEQ_create();
-MidiDriver *MidiDriver_QT_create();
-MidiDriver *MidiDriver_AMIDI_create();
+extern MidiDriver *MidiDriver_NULL_create();
+extern MidiDriver *MidiDriver_WIN_create();
+extern MidiDriver *MidiDriver_TIMIDITY_create();
+extern MidiDriver *MidiDriver_SEQ_create();
+extern MidiDriver *MidiDriver_QT_create();
+extern MidiDriver *MidiDriver_CORE_create();
+extern MidiDriver *MidiDriver_AMIDI_create();