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Diffstat (limited to 'src/lib/midi/Midiout.pas')
| -rw-r--r-- | src/lib/midi/Midiout.pas | 619 |
1 files changed, 619 insertions, 0 deletions
diff --git a/src/lib/midi/Midiout.pas b/src/lib/midi/Midiout.pas new file mode 100644 index 00000000..606d0dae --- /dev/null +++ b/src/lib/midi/Midiout.pas @@ -0,0 +1,619 @@ +{ $Header: /MidiComp/MidiOut.pas 2 10/06/97 7:33 Davec $ } + +{ Written by David Churcher <dchurcher@cix.compulink.co.uk>, + released to the public domain. } + +{ Thanks very much to Fred Kohler for the Technology code. } + +unit MidiOut; + +{ + MIDI Output component. + + Properties: + DeviceID: Windows numeric device ID for the MIDI output device. + Between 0 and (midioutGetNumDevs-1), or MIDI_MAPPER (-1). + Special value MIDI_MAPPER specifies output to the Windows MIDI mapper + Read-only while device is open, exception if changed while open + + MIDIHandle: The output handle to the MIDI device. + 0 when device is not open + Read-only, runtime-only + + ProductName: Name of the output device product that corresponds to the + DeviceID property (e.g. 'MPU 401 out'). + You can write to this while the device is closed to select a particular + output device by name (the DeviceID property will change to match). + Exception if this property is changed while the device is open. + + Numdevs: Number of MIDI output devices installed on the system. This + is the value returned by midiOutGetNumDevs. It's included for + completeness. + + Technology: Type of technology used by the MIDI device. You can set this + property to one of the values listed for OutportTech (below) and the component + will find an appropriate MIDI device. For example: + MidiOutput.Technology := opt_FMSynth; + will set MidiInput.DeviceID to the MIDI device ID of the FM synth, if one + is installed. If no such device is available an exception is raised, + see MidiOutput.SetTechnology. + + See the MIDIOUTCAPS entry in MMSYSTEM.HLP for descriptions of the + following properties: + DriverVersion + Voices + Notes + ChannelMask + Support + + Error: The error code for the last MMSYSTEM error. See the MMSYSERR_ + entries in MMSYSTEM.INT for possible values. + + Methods: + Open: Open MIDI device specified by DeviceID property for output + + Close: Close device + + PutMidiEvent(Event:TMyMidiEvent): Output a note or sysex message to the + device. This method takes a TMyMidiEvent object and transmits it. + Notes: + 1. If the object contains a sysex event the OnMidiOutput event will + be triggered when the sysex transmission is complete. + 2. You can queue up multiple blocks of system exclusive data for + transmission by chucking them at this method; they will be + transmitted as quickly as the device can manage. + 3. This method will not free the TMyMidiEvent object, the caller + must do that. Any sysex data in the TMyMidiEvent is copied before + transmission so you can free the TMyMidiEvent immediately after + calling PutMidiEvent, even if output has not yet finished. + + PutShort(MidiMessage: Byte; Data1: Byte; Data2: Byte): Output a short + MIDI message. Handy when you can't be bothered to build a TMyMidiEvent. + If the message you're sending doesn't use Data1 or Data2, set them to 0. + + PutLong(TheSysex: Pointer; msgLength: Word): Output sysex data. + SysexPointer: Pointer to sysex data to send + msgLength: Length of sysex data. + This is handy when you don't have a TMyMidiEvent. + + SetVolume(Left: Word, Right: Word): Set the volume of the + left and right channels on the output device (only on internal devices?). + 0xFFFF is maximum volume. If the device doesn't support separate + left/right volume control, the value of the Left parameter will be used. + Check the Support property to see whether the device supports volume + control. See also other notes on volume control under midiOutSetVolume() + in MMSYSTEM.HLP. + + Events: + OnMidiOutput: Procedure called when output of a system exclusive block + is completed. + + Notes: + I haven't implemented any methods for midiOutCachePatches and + midiOutCacheDrumpatches, mainly 'cause I don't have any way of testing + them. Does anyone really use these? +} + +interface + +{$IFDEF FPC} + {$MODE Delphi} + {$H+} // use AnsiString +{$ENDIF} + +uses + SysUtils, + Windows, + Messages, + Classes, + MMSystem, + {$IFDEF FPC} + WinAllocation, + {$ENDIF} + Circbuf, + MidiType, + MidiDefs, + Delphmcb; + +{$IFDEF FPC} +type TmidioutCaps = MIDIOUTCAPS; +{$ENDIF} + +type + midioutputState = (mosOpen, mosClosed); + EmidioutputError = class(Exception); + + { These are the equivalent of constants prefixed with mod_ + as defined in MMSystem. See SetTechnology } + OutPortTech = ( + opt_None, { none } + opt_MidiPort, { output port } + opt_Synth, { generic internal synth } + opt_SQSynth, { square wave internal synth } + opt_FMSynth, { FM internal synth } + opt_Mapper); { MIDI mapper } + TechNameMap = array[OutPortTech] of string[18]; + + +const + TechName: TechNameMap = ( + 'None', 'MIDI Port', 'Generic Synth', 'Square Wave Synth', + 'FM Synth', 'MIDI Mapper'); + +{-------------------------------------------------------------------} +type + TMidiOutput = class(TComponent) + protected + Handle: THandle; { Window handle used for callback notification } + FDeviceID: Cardinal; { MIDI device ID } + FMIDIHandle: Hmidiout; { Handle to output device } + FState: midioutputState; { Current device state } + PCtlInfo: PMidiCtlInfo; { Pointer to control info for DLL } + + PBuffer: PCircularBuffer; { Output queue for PutTimedEvent, set by Open } + + FError: Word; { Last MMSYSTEM error } + + { Stuff from midioutCAPS } + FDriverVersion: MMVERSION; { Driver version from midioutGetDevCaps } + FProductName: string; { product name } + FTechnology: OutPortTech; { Type of MIDI output device } + FVoices: Word; { Number of voices (internal synth) } + FNotes: Word; { Number of notes (internal synth) } + FChannelMask: Word; { Bit set for each MIDI channels that the + device responds to (internal synth) } + FSupport: DWORD; { Technology supported (volume control, + patch caching etc. } + FNumdevs: Word; { Number of MIDI output devices on system } + + + FOnMIDIOutput: TNotifyEvent; { Sysex output finished } + + procedure MidiOutput(var Message: TMessage); + procedure SetDeviceID(DeviceID: Cardinal); + procedure SetProductName(NewProductName: string); + procedure SetTechnology(NewTechnology: OutPortTech); + function midioutErrorString(WError: Word): string; + + public + { Properties } + property MIDIHandle: Hmidiout read FMIDIHandle; + property DriverVersion: MMVERSION { Driver version from midioutGetDevCaps } + read FDriverVersion; + property Technology: OutPortTech { Type of MIDI output device } + read FTechnology + write SetTechnology + default opt_Synth; + property Voices: Word { Number of voices (internal synth) } + read FVoices; + property Notes: Word { Number of notes (internal synth) } + read FNotes; + property ChannelMask: Word { Bit set for each MIDI channels that the } + read FChannelMask; { device responds to (internal synth) } + property Support: DWORD { Technology supported (volume control, } + read FSupport; { patch caching etc. } + property Error: Word read FError; + property Numdevs: Word read FNumdevs; + + { Methods } + function Open: Boolean; virtual; + function Close: Boolean; virtual; + procedure PutMidiEvent(theEvent: TMyMidiEvent); virtual; + procedure PutShort(MidiMessage: Byte; Data1: Byte; Data2: Byte); virtual; + procedure PutLong(TheSysex: Pointer; msgLength: Word); virtual; + procedure SetVolume(Left: Word; Right: Word); + constructor Create(AOwner: TComponent); override; + destructor Destroy; override; + + { Some functions to decode and classify incoming messages would be nice } + + published + { TODO: Property editor with dropdown list of product names } + property ProductName: string read FProductName write SetProductName; + + property DeviceID: Cardinal read FDeviceID write SetDeviceID default 0; + { TODO: midiOutGetVolume? Or two properties for Left and Right volume? + Is it worth it?? + midiOutMessage?? Does anyone use this? } + + { Events } + property Onmidioutput: TNotifyEvent + read FOnmidioutput + write FOnmidioutput; + end; + +procedure Register; + +{-------------------------------------------------------------------} +implementation + +(* Not used in Delphi 3 + +{ This is the callback procedure in the external DLL. + It's used when midioutOpen is called by the Open method. + There are special requirements and restrictions for this callback + procedure (see midioutOpen in MMSYSTEM.HLP) so it's impractical to + make it an object method } +{$IFDEF WIN32} +function midiHandler( + hMidiIn: HMidiIn; + wMsg: UINT; + dwInstance: DWORD; + dwParam1: DWORD; + dwParam2: DWORD): Boolean; stdcall; external 'DELMID32.DLL'; +{$ELSE} +function midiHandler( + hMidiIn: HMidiIn; + wMsg: Word; + dwInstance: DWORD; + dwParam1: DWORD; + dwParam2: DWORD): Boolean; far; external 'DELPHMID.DLL'; +{$ENDIF} +*) + +{-------------------------------------------------------------------} + +constructor Tmidioutput.Create(AOwner: TComponent); +begin + inherited Create(AOwner); + FState := mosClosed; + FNumdevs := midiOutGetNumDevs; + + { Create the window for callback notification } + if not (csDesigning in ComponentState) then + begin + Handle := AllocateHwnd(MidiOutput); + end; + +end; + +{-------------------------------------------------------------------} + +destructor Tmidioutput.Destroy; +begin + if FState = mosOpen then + Close; + if (PCtlInfo <> nil) then + GlobalSharedLockedFree(PCtlinfo^.hMem, PCtlInfo); + DeallocateHwnd(Handle); + inherited Destroy; +end; + +{-------------------------------------------------------------------} +{ Convert the numeric return code from an MMSYSTEM function to a string + using midioutGetErrorText. TODO: These errors aren't very helpful + (e.g. "an invalid parameter was passed to a system function") so + some proper error strings would be nice. } + + +function Tmidioutput.midioutErrorString(WError: Word): string; +var + errorDesc: PChar; +begin + errorDesc := nil; + try + errorDesc := StrAlloc(MAXERRORLENGTH); + if midioutGetErrorText(WError, errorDesc, MAXERRORLENGTH) = 0 then + result := StrPas(errorDesc) + else + result := 'Specified error number is out of range'; + finally + if errorDesc <> nil then StrDispose(errorDesc); + end; +end; + +{-------------------------------------------------------------------} +{ Set the output device ID and change the other properties to match } + +procedure Tmidioutput.SetDeviceID(DeviceID: Cardinal); +var + midioutCaps: TmidioutCaps; +begin + if FState = mosOpen then + raise EmidioutputError.Create('Change to DeviceID while device was open') + else + if (DeviceID >= midioutGetNumDevs) and (DeviceID <> MIDI_MAPPER) then + raise EmidioutputError.Create('Invalid device ID') + else + begin + FDeviceID := DeviceID; + + { Set the name and other midioutCAPS properties to match the ID } + FError := + midioutGetDevCaps(DeviceID, @midioutCaps, sizeof(TmidioutCaps)); + if Ferror > 0 then + raise EmidioutputError.Create(midioutErrorString(FError)); + + with midiOutCaps do + begin + FProductName := StrPas(szPname); + FDriverVersion := vDriverVersion; + FTechnology := OutPortTech(wTechnology); + FVoices := wVoices; + FNotes := wNotes; + FChannelMask := wChannelMask; + FSupport := dwSupport; + end; + + end; +end; + +{-------------------------------------------------------------------} +{ Set the product name property and put the matching output device number + in FDeviceID. + This is handy if you want to save a configured output/output device + by device name instead of device number, because device numbers may + change if users install or remove MIDI devices. + Exception if output device with matching name not found, + or if output device is open } + +procedure Tmidioutput.SetProductName(NewProductName: string); +var + midioutCaps: TmidioutCaps; + testDeviceID: Integer; + testProductName: string; +begin + if FState = mosOpen then + raise EmidioutputError.Create('Change to ProductName while device was open') + else + { Don't set the name if the component is reading properties because + the saved Productname will be from the machine the application was compiled + on, which may not be the same for the corresponding DeviceID on the user's + machine. The FProductname property will still be set by SetDeviceID } + if not (csLoading in ComponentState) then + begin + { Loop uses -1 to test for MIDI_MAPPER as well } + for testDeviceID := -1 to (midioutGetNumDevs - 1) do + begin + FError := + midioutGetDevCaps(testDeviceID, @midioutCaps, sizeof(TmidioutCaps)); + if Ferror > 0 then + raise EmidioutputError.Create(midioutErrorString(FError)); + testProductName := StrPas(midioutCaps.szPname); + if testProductName = NewProductName then + begin + FProductName := NewProductName; + Break; + end; + end; + if FProductName <> NewProductName then + raise EmidioutputError.Create('MIDI output Device ' + + NewProductName + ' not installed') + else + SetDeviceID(testDeviceID); + end; +end; + +{-------------------------------------------------------------------} +{ Set the output technology property and put the matching output device + number in FDeviceID. + This is handy, for example, if you want to be able to switch between a + sound card and a MIDI port } + +procedure TMidiOutput.SetTechnology(NewTechnology: OutPortTech); +var + midiOutCaps: TMidiOutCaps; + testDeviceID: Integer; + testTechnology: OutPortTech; +begin + if FState = mosOpen then + raise EMidiOutputError.Create( + 'Change to Product Technology while device was open') + else + begin + { Loop uses -1 to test for MIDI_MAPPER as well } + for testDeviceID := -1 to (midiOutGetNumDevs - 1) do + begin + FError := + midiOutGetDevCaps(testDeviceID, + @midiOutCaps, sizeof(TMidiOutCaps)); + if Ferror > 0 then + raise EMidiOutputError.Create(MidiOutErrorString(FError)); + testTechnology := OutPortTech(midiOutCaps.wTechnology); + if testTechnology = NewTechnology then + begin + FTechnology := NewTechnology; + Break; + end; + end; + if FTechnology <> NewTechnology then + raise EMidiOutputError.Create('MIDI output technology ' + + TechName[NewTechnology] + ' not installed') + else + SetDeviceID(testDeviceID); + end; +end; + +{-------------------------------------------------------------------} + +function Tmidioutput.Open: Boolean; +var + hMem: THandle; +begin + Result := False; + try + { Create the control info for the DLL } + if (PCtlInfo = nil) then + begin + PCtlInfo := GlobalSharedLockedAlloc(Sizeof(TMidiCtlInfo), hMem); + PctlInfo^.hMem := hMem; + end; + + Pctlinfo^.hWindow := Handle; { Control's window handle } + + FError := midioutOpen(@FMidiHandle, FDeviceId, + DWORD(@midiHandler), + DWORD(PCtlInfo), + CALLBACK_FUNCTION); +{ FError := midioutOpen(@FMidiHandle, FDeviceId, + Handle, + DWORD(PCtlInfo), + CALLBACK_WINDOW); } + if (FError <> 0) then + { TODO: use CreateFmtHelp to add MIDI device name/ID to message } + raise EmidioutputError.Create(midioutErrorString(FError)) + else + begin + Result := True; + FState := mosOpen; + end; + + except + if PCtlInfo <> nil then + begin + GlobalSharedLockedFree(PCtlInfo^.hMem, PCtlInfo); + PCtlInfo := nil; + end; + end; + +end; + +{-------------------------------------------------------------------} + +procedure TMidiOutput.PutShort(MidiMessage: Byte; Data1: Byte; Data2: Byte); +var + thisMsg: DWORD; +begin + thisMsg := DWORD(MidiMessage) or + (DWORD(Data1) shl 8) or + (DWORD(Data2) shl 16); + + FError := midiOutShortMsg(FMidiHandle, thisMsg); + if Ferror > 0 then + raise EmidioutputError.Create(midioutErrorString(FError)); +end; + +{-------------------------------------------------------------------} + +procedure TMidiOutput.PutLong(TheSysex: Pointer; msgLength: Word); +{ Notes: This works asynchronously; you send your sysex output by +calling this function, which returns immediately. When the MIDI device +driver has finished sending the data the MidiOutPut function in this +component is called, which will in turn call the OnMidiOutput method +if the component user has defined one. } +{ TODO: Combine common functions with PutTimedLong into subroutine } + +var + MyMidiHdr: TMyMidiHdr; +begin + { Initialize the header and allocate buffer memory } + MyMidiHdr := TMyMidiHdr.Create(msgLength); + + { Copy the data over to the MidiHdr buffer + We can't just use the caller's PChar because the buffer memory + has to be global, shareable, and locked. } + StrMove(MyMidiHdr.SysexPointer, TheSysex, msgLength); + + { Store the MyMidiHdr address in the header so we can find it again quickly + (see the MidiOutput proc) } + MyMidiHdr.hdrPointer^.dwUser := DWORD(MyMidiHdr); + + { Get MMSYSTEM's blessing for this header } + FError := midiOutPrepareHeader(FMidiHandle, MyMidiHdr.hdrPointer, + sizeof(TMIDIHDR)); + if Ferror > 0 then + raise EMidiOutputError.Create(MidiOutErrorString(FError)); + + { Send it } + FError := midiOutLongMsg(FMidiHandle, MyMidiHdr.hdrPointer, + sizeof(TMIDIHDR)); + if Ferror > 0 then + raise EMidiOutputError.Create(MidiOutErrorString(FError)); + +end; + +{-------------------------------------------------------------------} + +procedure Tmidioutput.PutMidiEvent(theEvent: TMyMidiEvent); +begin + if FState <> mosOpen then + raise EMidiOutputError.Create('MIDI Output device not open'); + + with theEvent do + begin + if Sysex = nil then + begin + PutShort(MidiMessage, Data1, Data2) + end + else + PutLong(Sysex, SysexLength); + end; +end; + +{-------------------------------------------------------------------} + +function Tmidioutput.Close: Boolean; +begin + Result := False; + if FState = mosOpen then + begin + + { Note this sends a lot of fast control change messages which some synths can't handle. + TODO: Make this optional. } +{ FError := midioutReset(FMidiHandle); + if Ferror <> 0 then + raise EMidiOutputError.Create(MidiOutErrorString(FError)); } + + FError := midioutClose(FMidiHandle); + if Ferror <> 0 then + raise EMidiOutputError.Create(MidiOutErrorString(FError)) + else + Result := True; + end; + + FMidiHandle := 0; + FState := mosClosed; + +end; + +{-------------------------------------------------------------------} + +procedure TMidiOutput.SetVolume(Left: Word; Right: Word); +var + dwVolume: DWORD; +begin + dwVolume := (DWORD(Left) shl 16) or Right; + FError := midiOutSetVolume(DeviceID, dwVolume); + if Ferror <> 0 then + raise EMidiOutputError.Create(MidiOutErrorString(FError)); +end; + +{-------------------------------------------------------------------} + +procedure Tmidioutput.midioutput(var Message: TMessage); +{ Triggered when sysex output from PutLong is complete } +var + MyMidiHdr: TMyMidiHdr; + thisHdr: PMidiHdr; +begin + if Message.Msg = Mom_Done then + begin + { Find the MIDIHDR we used for the output. Message.lParam is its address } + thisHdr := PMidiHdr(Message.lParam); + + { Remove it from the output device } + midiOutUnprepareHeader(FMidiHandle, thisHdr, sizeof(TMIDIHDR)); + + { Get the address of the MyMidiHdr object containing this MIDIHDR structure. + We stored this address in the PutLong procedure } + MyMidiHdr := TMyMidiHdr(thisHdr^.dwUser); + + { Header and copy of sysex data no longer required since output is complete } + MyMidiHdr.Free; + + { Call the user's event handler if any } + if Assigned(FOnmidioutput) then + FOnmidioutput(Self); + end; + { TODO: Case for MOM_PLAYBACK_DONE } +end; + +{-------------------------------------------------------------------} + +procedure Register; +begin + RegisterComponents('Synth', [Tmidioutput]); +end; + +end. + |