Difference between revisions of "MDI"
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===Instrument Structure=== | ===Instrument Structure=== | ||
| − | Instrument parameters are expressed with this structure: | + | Instrument parameters are expressed with this structure: (which is identical to the structure for an instrument inside a [[BNK]] file) |
{{Table Header | {{Table Header | ||
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| <tt>UINT8</tt> || <tt>con</tt> || Connector [op 0 only, op 1 ignored] || 0xC0 (bit 0, inverted) | | <tt>UINT8</tt> || <tt>con</tt> || Connector [op 0 only, op 1 ignored] || 0xC0 (bit 0, inverted) | ||
|} | |} | ||
| − | |||
===Channel Utilization=== | ===Channel Utilization=== | ||
Revision as of 09:17, 25 January 2015
| Ad Lib MIDI | |||||
 |
|||||
| Developer: | Ad Lib, Inc. | ||||
| Header: | SMF | ||||
| Content: | Notational | ||||
| Instruments: | Internal | ||||
Target Output
| |||||
| Released: | 1989-05-08 | ||||
| First Game: | ? | ||||
| Extensions |
|
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The MDI format was created by Ad Lib, Inc. to upgrade from ROL format. It uses the MIDI structure but incorporates OPL2 commands that allow it to store instrument data and change modes, similar to how CMF works. Because the format is so similar to MIDI, some MIDI players are able to play the files, though they won't utilize the instrument data or set the song into the correct mode, so the song won't sound correct. The players which can play MDI files correctly are listed below.
Contents
Players
- MIDI Play - DOS
- Multi Media Machine - DOS
Converters
MDI to ?
? to MDI
- ROL to MIDI - DOS - ROL
Games
|
Released
 |
Title
 |
Sample |
| 1990-??-?? | Golden Axe (DOS) | |
| 1991-??-?? | Dark Ages (DOS) | |
| 1991-??-?? | Prehistorik (DOS) | |
| 1992-??-?? | Amberstar (DOS) | |
| 1992-??-?? | Gear Works (DOS) | |
| 1992-??-?? | Starfire (DOS) | |
| 1993-??-?? | Ultimuh MCMLXVII (DOS) |
Technical
- All MDI files begin with "MThd" MIDI header and contain "MTrk" at the start of the MIDI track.
- The End Of Track "FF 2F 00" event is located at the end of file, but not included in the track.
- Some Note Off events may have only Velocity parameter to trigger the note off.
- Program Change events are not used in the track.
Sequencer-Specific Event Format
These events are used to control OPL-compatible chip.
|
Delta-ticks
 |
Event
 |
Length
 |
Ad Lib ID
 |
Opcode
 |
Data |
| 00 | FF 7F | XX | 00 00 3F | XX XX | XX .. XX |
Possible Opcodes
|
Opcode
 |
Meaning
 |
Byte #
 |
Description |
| 00 01 | Patch (instrument change) | 1 | Voice / channel number for instrument |
| 2 - 29 | 28 byte array of parameters (see structure below) | ||
| 00 02 | Card mode | 1 | 0 = melodic, 1 = percussive |
| 00 03 | Pitch bend sensitivity | 1 | 1 - 12 inclusive |
Instrument Structure
Instrument parameters are expressed with this structure: (which is identical to the structure for an instrument inside a BNK file)
|
Data type
 |
Name
 |
Description |
| MDI_OPLREGS | oplModulator | Register values for the Modulator operator (op 0) |
| MDI_OPLREGS | oplCarrier | Register values for the Carrier operator (op 1) |
| UINT8 | iModWaveSel | Modulator wave select (OPL base register 0xE0) |
| UINT8 | iCarWaveSel | Carrier wave select (OPL base register 0xE0) |
The MDI_OPLREGS structure is defined as:
|
Data type
 |
Name
 |
Description
 |
OPL base register |
| UINT8 | ksl | Key scaling level | 0x40 (bits 6-7) |
| UINT8 | multiple | Frequency multiplier | 0x20 (bits 0-3) |
| UINT8 | feedback | Feedback [op 0 only, op 1 ignored] | 0xC0 (bits 1-3) |
| UINT8 | attack | Attack rate | 0x60 (upper four bits) |
| UINT8 | sustain | Sustain level | 0x80 (upper four bits) |
| UINT8 | eg | Envelope gain (nonzero value is on) | 0x20 (bit 5) |
| UINT8 | decay | Decay rate | 0x60 (lower four bits) |
| UINT8 | releaseRate | Release rate | 0x80 (lower four bits) |
| UINT8 | totalLevel | Total output level | 0x40 (bit 0-5) |
| UINT8 | am | Amplitude modulation (Tremolo) | 0x20 (bit 7) |
| UINT8 | vib | Frequency Vibrato | 0x20 (bit 6) |
| UINT8 | ksr | Key scaling/envelope rate | 0x20 (bit 4) |
| UINT8 | con | Connector [op 0 only, op 1 ignored] | 0xC0 (bit 0, inverted) |
Channel Utilization
The channel utilization is the same as in the MUS (AdLib) format.
|
Hex channel
 |
MIDI channel
 |
Use in melodic mode
 |
Use in percussive mode |
| 0x00 | 1 | Normal instrument | Normal instrument |
| 0x01 | 2 | Normal instrument | Normal instrument |
| 0x02 | 3 | Normal instrument | Normal instrument |
| 0x03 | 4 | Normal instrument | Normal instrument |
| 0x04 | 5 | Normal instrument | Normal instrument |
| 0x05 | 6 | Normal instrument | Normal instrument |
| 0x06 | 7 | Normal instrument | Bass drum |
| 0x07 | 8 | Normal instrument | Snare drum |
| 0x08 | 9 | Normal instrument | Tom tom |
| 0x09 | 10 | Unused | Top cymbal |
| 0x0A | 11 | Unused | Hi-hat cymbal |
| 0x0B | 12 | Unused | Unused |
| 0x0C | 13 | Unused | Unused |
| 0x0D | 14 | Unused | Unused |
| 0x0E | 15 | Unused | Unused |
| 0x0F | 16 | Unused | Unused |
Default Timbre
Player should load this timbre if it isn't loaded by sequencer-specific event before:
|
OPL base register
 |
Value
 |
Description |
| 0x20 | 0x01 | Modulator characteristic (Mult, KSR, EG, VIB and AM flags) |
| 0x23 | 0x11 | Carrier characteristic (Mult, KSR, EG, VIB and AM flags) |
| 0x40 | 0x4F | Modulator key scaling/output level |
| 0x43 | 0x10 | Carrier key scaling/output level |
| 0x60 | 0xF1 | Modulator attack/decay level |
| 0x63 | 0xF2 | Carrier attack/decay level |
| 0x80 | 0x53 | Modulator sustain/release level |
| 0x83 | 0x74 | Carrier sustain/release level |
| 0xE0 | 0x00 | Modulator wave select |
| 0xE3 | 0x00 | Carrier wave select |
| 0xC0 | 0x06 | Feedback/connection |
Links
- cd.textfiles.com/soundsensations/MISCPROG/AD-PROG/ - Source code (part of the Ad Lib Programmer's Manual).
- swag.outpostbbs.net/SOUND/0066.PAS - MDI2MUS by Colin Buckley (incomplete program source).
