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52 lines
2.1 KiB
Plaintext
52 lines
2.1 KiB
Plaintext
BEEPMIDI :: BEEP.SYS MIDI DRIVER
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(c) Andrew Greenwood, 2007.
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http://www.silverblade.co.uk
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Released as open-source software. You may copy, re-distribute and modify
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this software, provided this copyright notice remains intact.
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WHAT'S THIS ?
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BeepMidi is a MME MIDI driver for NT-compatible operating systems,
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which uses BEEP.SYS (the kernel-mode PC speaker driver) to play
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MIDI data. It installs as a standard MIDI output device and can even
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be selected as your default MIDI output device. The fundamental
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code for interacting with BEEP.SYS was taken from ReactOS' kernel32
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module.
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WHY WAS THIS WRITTEN ?
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Primarily for educational reasons - in the process, I've learned more
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about the driver side of the MME API and how to interact with kernel
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device drivers. It aids as a good starting point from which to
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move on to bigger and better things :)
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HOW TO INSTALL :
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Copy the file to C:\WINDOWS\SYSTEM32\BEEPMIDI.DLL
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Go into HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\
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Drivers32 in RegEdit and look for the "midi" entries on the right hand
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side. Find the highest numbered one (eg: midi1) and create a new STRING
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value. Give it another midi name, but one above the current highest
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entry present (eg: midi2.)
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You'll now see a "PC Speaker" entry in Sound & Audio Devices.
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TWEAKING:
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See the comments toward the top of beepmidi.c for tweakable driver
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parameters. These can only be adjusted in the source code at present.
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FEATURES :
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* Supports note-on and note-off messages on channels 1-9 and 11-16
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(channel 10 is rhythm, which is not supported.)
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* Fake polyphony (actually just arpeggiates playing notes!)
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* Threaded design for continuous playback (optional.)
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ROOM FOR IMPROVEMENT :
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* Pitch bend is not supported
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* Velocity could determine timeslice
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* Should wait for timeslice to complete before adding/removing notes
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* Would be nice to allow configuration of polyphony etc. via Control Panel
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BUGS :
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* Crashes when used with Windows Media Player (mplayer2 is fine though)
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