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-{ $Header: /MidiComp/DELPHMCB.PAS 2 10/06/97 7:33 Davec $ }
-
-{MIDI callback for Delphi, was DLL for Delphi 1}
-
-unit Delphmcb;
-
-{ These segment options required for the MIDI callback functions }
-{$IFNDEF FPC}
-{$C PRELOAD FIXED PERMANENT}
-{$ENDIF}
-
-interface
-
-{$IFDEF FPC}
- {$MODE Delphi}
- {$H+} // use long strings
-{$ENDIF}
-
-uses
- Windows,
- MMsystem,
- Circbuf,
- MidiDefs,
- MidiCons;
-
-procedure midiHandler(
- hMidiIn: HMidiIn;
- wMsg: UINT;
- dwInstance: DWORD;
- dwParam1: DWORD;
- dwParam2: DWORD); stdcall; export;
-function CircbufPutEvent(PBuffer: PCircularBuffer; PTheEvent: PMidiBufferItem): Boolean; stdcall; export;
-
-implementation
-
-{ Add an event to the circular input buffer. }
-function CircbufPutEvent(PBuffer: PCircularBuffer; PTheEvent: PMidiBufferItem): Boolean; stdcall;
-begin
- If (PBuffer^.EventCount < PBuffer^.Capacity) Then
- begin
- Inc(Pbuffer^.EventCount);
-
- { Todo: better way of copying this record }
- with PBuffer^.PNextput^ do
- begin
- Timestamp := PTheEvent^.Timestamp;
- Data := PTheEvent^.Data;
- Sysex := PTheEvent^.Sysex;
- end;
-
- { Move to next put location, with wrap }
- Inc(Pbuffer^.PNextPut);
- If (PBuffer^.PNextPut = PBuffer^.PEnd) then
- PBuffer^.PNextPut := PBuffer^.PStart;
-
- CircbufPutEvent := True;
- end
- else
- CircbufPutEvent := False;
-end;
-
-{ This is the callback function specified when the MIDI device was opened
- by midiInOpen. It's called at interrupt time when MIDI input is seen
- by the MIDI device driver(s). See the docs for midiInOpen for restrictions
- on the Windows functions that can be called in this interrupt. }
-procedure midiHandler(
- hMidiIn: HMidiIn;
- wMsg: UINT;
- dwInstance: DWORD;
- dwParam1: DWORD;
- dwParam2: DWORD); stdcall;
-var
- thisEvent: TMidiBufferItem;
- thisCtlInfo: PMidiCtlInfo;
- thisBuffer: PCircularBuffer;
-Begin
- case wMsg of
-
- mim_Open: {nothing};
-
- mim_Error: {TODO: handle (message to trigger exception?) };
-
- mim_Data, mim_Longdata, mim_Longerror:
- { Note: mim_Longerror included because there's a bug in the Maui
- input driver that sends MIM_LONGERROR for subsequent buffers when
- the input buffer is smaller than the sysex block being received }
-
- begin
- { TODO: Make filtered messages customisable, I'm sure someone wants to
- do something with MTC! }
- if (dwParam1 <> MIDI_ACTIVESENSING) and
- (dwParam1 <> MIDI_TIMINGCLOCK) then
- begin
-
- { The device driver passes us the instance data pointer we
- specified for midiInOpen. Use this to get the buffer address
- and window handle for the MIDI control }
- thisCtlInfo := PMidiCtlInfo(dwInstance);
- thisBuffer := thisCtlInfo^.PBuffer;
-
- { Screen out short messages if we've been asked to }
- if ((wMsg <> mim_Data) or (thisCtlInfo^.SysexOnly = False))
- and (thisCtlInfo <> Nil) and (thisBuffer <> Nil) then
- begin
- with thisEvent do
- begin
- timestamp := dwParam2;
- if (wMsg = mim_Longdata) or
- (wMsg = mim_Longerror) then
- begin
- data := 0;
- sysex := PMidiHdr(dwParam1);
- end
- else
- begin
- data := dwParam1;
- sysex := Nil;
- end;
- end;
- if CircbufPutEvent( thisBuffer, @thisEvent ) then
- { Send a message to the control to say input's arrived }
- PostMessage(thisCtlInfo^.hWindow, mim_Data, 0, 0)
- else
- { Buffer overflow }
- PostMessage(thisCtlInfo^.hWindow, mim_Overflow, 0, 0);
- end;
- end;
- end;
-
- mom_Done: { Sysex output complete, dwParam1 is pointer to MIDIHDR }
- begin
- { Notify the control that its sysex output is finished.
- The control should call midiOutUnprepareHeader before freeing the buffer }
- PostMessage(PMidiCtlInfo(dwInstance)^.hWindow, mom_Done, 0, dwParam1);
- end;
-
- end; { Case }
-end;
-
-end.