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author | Alexander Sulfrian <alexander@sulfrian.net> | 2011-11-07 15:26:44 +0100 |
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committer | Alexander Sulfrian <alexander@sulfrian.net> | 2013-01-05 17:17:49 +0100 |
commit | 3260749d369d3466c345d40a8b2189c32c8c1b60 (patch) | |
tree | bdf235d333e6b4d0b0edb11bde421617a180ff92 /src/lib/midi/Midiin.pas | |
parent | de5a3593ae7bc6fb5aab9d76d01d3faa47b91bba (diff) | |
download | usdx-3260749d369d3466c345d40a8b2189c32c8c1b60.tar.gz usdx-3260749d369d3466c345d40a8b2189c32c8c1b60.tar.xz usdx-3260749d369d3466c345d40a8b2189c32c8c1b60.zip |
removed pascal code
Diffstat (limited to '')
-rw-r--r-- | src/lib/midi/Midiin.pas | 727 |
1 files changed, 0 insertions, 727 deletions
diff --git a/src/lib/midi/Midiin.pas b/src/lib/midi/Midiin.pas deleted file mode 100644 index 66e4f76d..00000000 --- a/src/lib/midi/Midiin.pas +++ /dev/null @@ -1,727 +0,0 @@ -{ $Header: /MidiComp/Midiin.pas 2 10/06/97 7:33 Davec $ } - -{ Written by David Churcher <dchurcher@cix.compulink.co.uk>, - released to the public domain. } - -unit MidiIn; - -{ - Properties: - DeviceID: Windows numeric device ID for the MIDI input device. - Between 0 and NumDevs-1. - Read-only while device is open, exception when changed while open - - MIDIHandle: The input handle to the MIDI device. - 0 when device is not open - Read-only, runtime-only - - MessageCount: Number of input messages waiting in input buffer - - Capacity: Number of messages input buffer can hold - Defaults to 1024 - Limited to (64K/event size) - Read-only when device is open (exception when changed while open) - - SysexBufferSize: Size in bytes of each sysex buffer - Defaults to 10K - Minimum 0K (no buffers), Maximum 64K-1 - - SysexBufferCount: Number of sysex buffers - Defaults to 16 - Minimum 0 (no buffers), Maximum (avail mem/SysexBufferSize) - Check where these buffers are allocated? - - SysexOnly: True to ignore all non-sysex input events. May be changed while - device is open. Handy for patch editors where you have lots of short MIDI - events on the wire which you are always going to ignore anyway. - - DriverVersion: Version number of MIDI device driver. High-order byte is - major version, low-order byte is minor version. - - ProductName: Name of product (e.g. 'MPU 401 In') - - MID and PID: Manufacturer ID and Product ID, see - "Manufacturer and Product IDs" in MMSYSTEM.HLP for list of possible values. - - Methods: - GetMidiEvent: Read Midi event at the head of the FIFO input buffer. - Returns a TMyMidiEvent object containing MIDI message data, timestamp, - and sysex data if applicable. - This method automatically removes the event from the input buffer. - It makes a copy of the received sysex buffer and puts the buffer back - on the input device. - The TMyMidiEvent object must be freed by calling MyMidiEvent.Free. - - Open: Opens device. Note no input will appear until you call the Start - method. - - Close: Closes device. Any pending system exclusive output will be cancelled. - - Start: Starts receiving MIDI input. - - Stop: Stops receiving MIDI input. - - Events: - OnMidiInput: Called when MIDI input data arrives. Use the GetMidiEvent to - get the MIDI input data. - - OnOverflow: Called if the MIDI input buffer overflows. The caller must - clear the buffer before any more MIDI input can be received. - - Notes: - Buffering: Uses a circular buffer, separate pointers for next location - to fill and next location to empty because a MIDI input interrupt may - be adding data to the buffer while the buffer is being read. Buffer - pointers wrap around from end to start of buffer automatically. If - buffer overflows then the OnBufferOverflow event is triggered and no - further input will be received until the buffer is emptied by calls - to GetMidiEvent. - - Sysex buffers: There are (SysexBufferCount) buffers on the input device. - When sysex events arrive these buffers are removed from the input device and - added to the circular buffer by the interrupt handler in the DLL. When the sysex events - are removed from the circular buffer by the GetMidiEvent method the buffers are - put back on the input. If all the buffers are used up there will be no - more sysex input until at least one sysex event is removed from the input buffer. - In other words if you're expecting lots of sysex input you need to set the - SysexBufferCount property high enough so that you won't run out of - input buffers before you get a chance to read them with GetMidiEvent. - - If the synth sends a block of sysex that's longer than SysexBufferSize it - will be received as separate events. - TODO: Component derived from this one that handles >64K sysex blocks cleanly - and can stream them to disk. - - Midi Time Code (MTC) and Active Sensing: The DLL is currently hardcoded - to filter these short events out, so that we don't spend all our time - processing them. - TODO: implement a filter property to select the events that will be filtered - out. -} - -interface - -{$IFDEF FPC} - {$MODE Delphi} - {$H+} // use long strings -{$ENDIF} - -uses - Classes, - SysUtils, - Messages, - Windows, - MMSystem, - {$IFDEF FPC} - WinAllocation, - {$ENDIF} - MidiDefs, - MidiType, - MidiCons, - Circbuf, - Delphmcb; - -type - MidiInputState = (misOpen, misClosed, misCreating, misDestroying); - EMidiInputError = class(Exception); - - {-------------------------------------------------------------------} - TMidiInput = class(TComponent) - private - Handle: THandle; { Window handle used for callback notification } - FDeviceID: Word; { MIDI device ID } - FMIDIHandle: HMIDIIn; { Handle to input device } - FState: MidiInputState; { Current device state } - - FError: Word; - FSysexOnly: Boolean; - - { Stuff from MIDIINCAPS } - FDriverVersion: MMVERSION; - FProductName: string; - FMID: Word; { Manufacturer ID } - FPID: Word; { Product ID } - - { Queue } - FCapacity: Word; { Buffer capacity } - PBuffer: PCircularBuffer; { Low-level MIDI input buffer created by Open method } - FNumdevs: Word; { Number of input devices on system } - - { Events } - FOnMIDIInput: TNotifyEvent; { MIDI Input arrived } - FOnOverflow: TNotifyEvent; { Input buffer overflow } - { TODO: Some sort of error handling event for MIM_ERROR } - - { Sysex } - FSysexBufferSize: Word; - FSysexBufferCount: Word; - MidiHdrs: Tlist; - - PCtlInfo: PMidiCtlInfo; { Pointer to control info for DLL } - - protected - procedure Prepareheaders; - procedure UnprepareHeaders; - procedure AddBuffers; - procedure SetDeviceID(DeviceID: Word); - procedure SetProductName(NewProductName: string); - function GetEventCount: Word; - procedure SetSysexBufferSize(BufferSize: Word); - procedure SetSysexBufferCount(BufferCount: Word); - procedure SetSysexOnly(bSysexOnly: Boolean); - function MidiInErrorString(WError: Word): string; - - public - constructor Create(AOwner: TComponent); override; - destructor Destroy; override; - - property MIDIHandle: HMIDIIn read FMIDIHandle; - - property DriverVersion: MMVERSION read FDriverVersion; - property MID: Word read FMID; { Manufacturer ID } - property PID: Word read FPID; { Product ID } - - property Numdevs: Word read FNumdevs; - - property MessageCount: Word read GetEventCount; - { TODO: property to select which incoming messages get filtered out } - - procedure Open; - procedure Close; - procedure Start; - procedure Stop; - { Get first message in input queue } - function GetMidiEvent: TMyMidiEvent; - procedure MidiInput(var Message: TMessage); - - { Some functions to decode and classify incoming messages would be good } - - published - - { TODO: Property editor with dropdown list of product names } - property ProductName: string read FProductName write SetProductName; - - property DeviceID: Word read FDeviceID write SetDeviceID default 0; - property Capacity: Word read FCapacity write FCapacity default 1024; - property Error: Word read FError; - property SysexBufferSize: Word - read FSysexBufferSize - write SetSysexBufferSize - default 10000; - property SysexBufferCount: Word - read FSysexBufferCount - write SetSysexBufferCount - default 16; - property SysexOnly: Boolean - read FSysexOnly - write SetSysexOnly - default False; - - { Events } - property OnMidiInput: TNotifyEvent read FOnMidiInput write FOnMidiInput; - property OnOverflow: TNotifyEvent read FOnOverflow write FOnOverflow; - - end; - -procedure Register; - -{====================================================================} -implementation - -uses Controls, - Graphics; - -(* Not used in Delphi 3 -{ This is the callback procedure in the external DLL. - It's used when midiInOpen is called by the Open method. - There are special requirements and restrictions for this callback - procedure (see midiInOpen 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} -procedure midiHandler( - hMidiIn: HMidiIn; - wMsg: Word; - dwInstance: DWORD; - dwParam1: DWORD; - dwParam2: DWORD); far; external 'DELPHMID'; -{$ENDIF} -*) -{-------------------------------------------------------------------} - -constructor TMidiInput.Create(AOwner: TComponent); -begin - inherited Create(AOwner); - FState := misCreating; - - FSysexOnly := False; - FNumDevs := midiInGetNumDevs; - MidiHdrs := nil; - - { Set defaults } - if (FNumDevs > 0) then - SetDeviceID(0); - FCapacity := 1024; - FSysexBufferSize := 4096; - FSysexBufferCount := 16; - - { Create the window for callback notification } - if not (csDesigning in ComponentState) then - begin - Handle := AllocateHwnd(MidiInput); - end; - - FState := misClosed; - -end; - -{-------------------------------------------------------------------} -{ Close the device if it's open } - -destructor TMidiInput.Destroy; -begin - if (FMidiHandle <> 0) then - begin - Close; - FMidiHandle := 0; - end; - - 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 midiInGetErrorText. TODO: These errors aren't very helpful - (e.g. "an invalid parameter was passed to a system function") so - sort out some proper error strings. } - -function TMidiInput.MidiInErrorString(WError: Word): string; -var - errorDesc: PChar; -begin - errorDesc := nil; - try - errorDesc := StrAlloc(MAXERRORLENGTH); - if midiInGetErrorText(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 sysex buffer size, fail if device is already open } - -procedure TMidiInput.SetSysexBufferSize(BufferSize: Word); -begin - if FState = misOpen then - raise EMidiInputError.Create('Change to SysexBufferSize while device was open') - else - { TODO: Validate the sysex buffer size. Is this necessary for WIN32? } - FSysexBufferSize := BufferSize; -end; - -{-------------------------------------------------------------------} -{ Set the sysex buffer count, fail if device is already open } - -procedure TMidiInput.SetSysexBuffercount(Buffercount: Word); -begin - if FState = misOpen then - raise EMidiInputError.Create('Change to SysexBuffercount while device was open') - else - { TODO: Validate the sysex buffer count } - FSysexBuffercount := Buffercount; -end; - -{-------------------------------------------------------------------} -{ Set the Sysex Only flag to eliminate unwanted short MIDI input messages } - -procedure TMidiInput.SetSysexOnly(bSysexOnly: Boolean); -begin - FSysexOnly := bSysexOnly; - { Update the interrupt handler's copy of this property } - if PCtlInfo <> nil then - PCtlInfo^.SysexOnly := bSysexOnly; -end; - -{-------------------------------------------------------------------} -{ Set the Device ID to select a new MIDI input device - Note: If no MIDI devices are installed, throws an 'Invalid Device ID' exception } - -procedure TMidiInput.SetDeviceID(DeviceID: Word); -var - MidiInCaps: TMidiInCaps; -begin - if FState = misOpen then - raise EMidiInputError.Create('Change to DeviceID while device was open') - else - if (DeviceID >= midiInGetNumDevs) then - raise EMidiInputError.Create('Invalid device ID') - else - begin - FDeviceID := DeviceID; - - { Set the name and other MIDIINCAPS properties to match the ID } - FError := - midiInGetDevCaps(DeviceID, @MidiInCaps, sizeof(TMidiInCaps)); - if Ferror <> MMSYSERR_NOERROR then - raise EMidiInputError.Create(MidiInErrorString(FError)); - - FProductName := StrPas(MidiInCaps.szPname); - FDriverVersion := MidiInCaps.vDriverVersion; - FMID := MidiInCaps.wMID; - FPID := MidiInCaps.wPID; - - end; -end; - -{-------------------------------------------------------------------} -{ Set the product name and put the matching input device number in FDeviceID. - This is handy if you want to save a configured input/output device - by device name instead of device number, because device numbers may - change if users add or remove MIDI devices. - Exception if input device with matching name not found, - or if input device is open } - -procedure TMidiInput.SetProductName(NewProductName: string); -var - MidiInCaps: TMidiInCaps; - testDeviceID: Word; - testProductName: string; -begin - if FState = misOpen then - raise EMidiInputError.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 - begin - for testDeviceID := 0 to (midiInGetNumDevs - 1) do - begin - FError := - midiInGetDevCaps(testDeviceID, @MidiInCaps, sizeof(TMidiInCaps)); - if Ferror <> MMSYSERR_NOERROR then - raise EMidiInputError.Create(MidiInErrorString(FError)); - testProductName := StrPas(MidiInCaps.szPname); - if testProductName = NewProductName then - begin - FProductName := NewProductName; - Break; - end; - end; - if FProductName <> NewProductName then - raise EMidiInputError.Create('MIDI Input Device ' + - NewProductName + ' not installed ') - else - SetDeviceID(testDeviceID); - end; - end; -end; - - -{-------------------------------------------------------------------} -{ Get the sysex buffers ready } - -procedure TMidiInput.PrepareHeaders; -var - ctr: Word; - MyMidiHdr: TMyMidiHdr; -begin - if (FSysexBufferCount > 0) and (FSysexBufferSize > 0) - and (FMidiHandle <> 0) then - begin - Midihdrs := TList.Create; - for ctr := 1 to FSysexBufferCount do - begin - { Initialize the header and allocate buffer memory } - MyMidiHdr := TMyMidiHdr.Create(FSysexBufferSize); - - { Store the address of the MyMidiHdr object in the contained MIDIHDR - structure so we can get back to the object when a pointer to the - MIDIHDR is received. - E.g. see TMidiOutput.Output method } - MyMidiHdr.hdrPointer^.dwUser := DWORD(MyMidiHdr); - - { Get MMSYSTEM's blessing for this header } - FError := midiInPrepareHeader(FMidiHandle, MyMidiHdr.hdrPointer, - sizeof(TMIDIHDR)); - if Ferror <> MMSYSERR_NOERROR then - raise EMidiInputError.Create(MidiInErrorString(FError)); - - { Save it in our list } - MidiHdrs.Add(MyMidiHdr); - end; - end; - -end; - -{-------------------------------------------------------------------} -{ Clean up from PrepareHeaders } - -procedure TMidiInput.UnprepareHeaders; -var - ctr: Word; -begin - if (MidiHdrs <> nil) then { will be Nil if 0 sysex buffers } - begin - for ctr := 0 to MidiHdrs.Count - 1 do - begin - FError := midiInUnprepareHeader(FMidiHandle, - TMyMidiHdr(MidiHdrs.Items[ctr]).hdrPointer, - sizeof(TMIDIHDR)); - if Ferror <> MMSYSERR_NOERROR then - raise EMidiInputError.Create(MidiInErrorString(FError)); - TMyMidiHdr(MidiHdrs.Items[ctr]).Free; - end; - MidiHdrs.Free; - MidiHdrs := nil; - end; -end; - -{-------------------------------------------------------------------} -{ Add sysex buffers, if required, to input device } - -procedure TMidiInput.AddBuffers; -var - ctr: Word; -begin - if MidiHdrs <> nil then { will be Nil if 0 sysex buffers } - begin - if MidiHdrs.Count > 0 then - begin - for ctr := 0 to MidiHdrs.Count - 1 do - begin - FError := midiInAddBuffer(FMidiHandle, - TMyMidiHdr(MidiHdrs.Items[ctr]).hdrPointer, - sizeof(TMIDIHDR)); - if FError <> MMSYSERR_NOERROR then - raise EMidiInputError.Create(MidiInErrorString(FError)); - end; - end; - end; -end; - -{-------------------------------------------------------------------} - -procedure TMidiInput.Open; -var - hMem: THandle; -begin - try - { Create the buffer for the MIDI input messages } - if (PBuffer = nil) then - PBuffer := CircBufAlloc(FCapacity); - - { Create the control info for the DLL } - if (PCtlInfo = nil) then - begin - PCtlInfo := GlobalSharedLockedAlloc(Sizeof(TMidiCtlInfo), hMem); - PctlInfo^.hMem := hMem; - end; - PctlInfo^.pBuffer := PBuffer; - Pctlinfo^.hWindow := Handle; { Control's window handle } - PCtlInfo^.SysexOnly := FSysexOnly; - FError := midiInOpen(@FMidiHandle, FDeviceId, - DWORD(@midiHandler), - DWORD(PCtlInfo), - CALLBACK_FUNCTION); - - if (FError <> MMSYSERR_NOERROR) then - { TODO: use CreateFmtHelp to add MIDI device name/ID to message } - raise EMidiInputError.Create(MidiInErrorString(FError)); - - { Get sysex buffers ready } - PrepareHeaders; - - { Add them to the input } - AddBuffers; - - FState := misOpen; - - except - if PBuffer <> nil then - begin - CircBufFree(PBuffer); - PBuffer := nil; - end; - - if PCtlInfo <> nil then - begin - GlobalSharedLockedFree(PCtlInfo^.hMem, PCtlInfo); - PCtlInfo := nil; - end; - - end; - -end; - -{-------------------------------------------------------------------} - -function TMidiInput.GetMidiEvent: TMyMidiEvent; -var - thisItem: TMidiBufferItem; -begin - if (FState = misOpen) and - CircBufReadEvent(PBuffer, @thisItem) then - begin - Result := TMyMidiEvent.Create; - with thisItem do - begin - Result.Time := Timestamp; - if (Sysex = nil) then - begin - { Short message } - Result.MidiMessage := LoByte(LoWord(Data)); - Result.Data1 := HiByte(LoWord(Data)); - Result.Data2 := LoByte(HiWord(Data)); - Result.Sysex := nil; - Result.SysexLength := 0; - end - else - { Long Sysex message } - begin - Result.MidiMessage := MIDI_BEGINSYSEX; - Result.Data1 := 0; - Result.Data2 := 0; - Result.SysexLength := Sysex^.dwBytesRecorded; - if Sysex^.dwBytesRecorded <> 0 then - begin - { Put a copy of the sysex buffer in the object } - GetMem(Result.Sysex, Sysex^.dwBytesRecorded); - StrMove(Result.Sysex, Sysex^.lpData, Sysex^.dwBytesRecorded); - end; - - { Put the header back on the input buffer } - FError := midiInPrepareHeader(FMidiHandle, Sysex, - sizeof(TMIDIHDR)); - if Ferror = 0 then - FError := midiInAddBuffer(FMidiHandle, - Sysex, sizeof(TMIDIHDR)); - if Ferror <> MMSYSERR_NOERROR then - raise EMidiInputError.Create(MidiInErrorString(FError)); - end; - end; - CircbufRemoveEvent(PBuffer); - end - else - { Device isn't open, return a nil event } - Result := nil; -end; - -{-------------------------------------------------------------------} - -function TMidiInput.GetEventCount: Word; -begin - if FState = misOpen then - Result := PBuffer^.EventCount - else - Result := 0; -end; - -{-------------------------------------------------------------------} - -procedure TMidiInput.Close; -begin - if FState = misOpen then - begin - FState := misClosed; - - { MidiInReset cancels any pending output. - Note that midiInReset causes an MIM_LONGDATA callback for each sysex - buffer on the input, so the callback function and Midi input buffer - should still be viable at this stage. - All the resulting MIM_LONGDATA callbacks will be completed by the time - MidiInReset returns, though. } - FError := MidiInReset(FMidiHandle); - if Ferror <> MMSYSERR_NOERROR then - raise EMidiInputError.Create(MidiInErrorString(FError)); - - { Remove sysex buffers from input device and free them } - UnPrepareHeaders; - - { Close the device (finally!) } - FError := MidiInClose(FMidiHandle); - if Ferror <> MMSYSERR_NOERROR then - raise EMidiInputError.Create(MidiInErrorString(FError)); - - FMidiHandle := 0; - - if (PBuffer <> nil) then - begin - CircBufFree(PBuffer); - PBuffer := nil; - end; - end; -end; - -{-------------------------------------------------------------------} - -procedure TMidiInput.Start; -begin - if FState = misOpen then - begin - FError := MidiInStart(FMidiHandle); - if Ferror <> MMSYSERR_NOERROR then - raise EMidiInputError.Create(MidiInErrorString(FError)); - end; -end; - -{-------------------------------------------------------------------} - -procedure TMidiInput.Stop; -begin - if FState = misOpen then - begin - FError := MidiInStop(FMidiHandle); - if Ferror <> MMSYSERR_NOERROR then - raise EMidiInputError.Create(MidiInErrorString(FError)); - end; -end; - -{-------------------------------------------------------------------} - -procedure TMidiInput.MidiInput(var Message: TMessage); -{ Triggered by incoming message from DLL. - Note DLL has already put the message in the queue } -begin - case Message.Msg of - mim_data: - { Trigger the user's MIDI input event, if they've specified one and - we're not in the process of closing the device. The check for - GetEventCount > 0 prevents unnecessary event calls where the user has - already cleared all the events from the input buffer using a GetMidiEvent - loop in the OnMidiInput event handler } - if Assigned(FOnMIDIInput) and (FState = misOpen) - and (GetEventCount > 0) then - FOnMIDIInput(Self); - - mim_Overflow: { input circular buffer overflow } - if Assigned(FOnOverflow) and (FState = misOpen) then - FOnOverflow(Self); - end; -end; - -{-------------------------------------------------------------------} - -procedure Register; -begin - RegisterComponents('Synth', [TMIDIInput]); -end; - -end. - |