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# The MIDIMonster
Named for it's scary math, the MIDIMonster is a universal translation
tool between multi-channel absolute-value-based control and/or bus protocols,
such as MIDI, DMX/ArtNet and OSC.
It allows the user to translate channels on one protocol into channels on another
(or the same) protocol, eg
* Translate MIDI Control Changes into Notes
* Translate MIDI Notes into ArtNet
* Translate OSC messages into MIDI
## Configuration
Each protocol supported by MIDIMonster is implemented by a *backend*, which takes
global protocol-specific options and provides *instance*s, which can be configured further.
The configuration is stored in a file with a format very similar to the common
INI file format. A section is started by a header in `[]` braces, followed by
lines of the form `option = value`.
A section may either be a *backend configuration* section, started by `[backend <backend-name>]`,
an *instance configuration* section, started by `[<backend-name> <instance-name>]` or a *mapping*
section started by `[map]`.
The `[map]` section consists of lines of channel-to-channel assignments, reading like
```
instance.target-channel = instance.source-channel
```
Assignments are one-way only, so to create a bi-directional mapping two assignments are needed.
An example configuration can be found in [monster.cfg](monster.cfg).
The options accepted by the implemented backends are documented in the next section.
### The `artnet` backend
The ArtNet backend provides read-write access to the UDP-based ArtNet protocol for lighting
fixture control.
#### Global configuration
| Option | Example value | Default value | Description |
|---------------|-----------------------|-----------------------|-----------------------|
| `bind` | `127.0.0.1 6454` | *none* | What address and port to bind the ArtNet socket to |
| `net` | `0` | `0` | The default net to use |
#### Instance configuration
| Option | Example value | Default value | Description |
|---------------|-----------------------|-----------------------|-----------------------|
| `net` | `0` | `0` | ArtNet net to use |
| `uni` | `0` | `0` | ArtNet universe to use|
| `output` | `true` | `false` | Controls whether ArtNet frames for this universe are output (otherwise the universe is input-only) |
| `dest` | `10.2.2.2` | `255.255.255.255` | Destination address for sent ArtNet frames |
#### Channel specification
A channel is specified by it's universe index. Channel indices start at 1 and end at 512.
Example mapping:
```
net1.231 = net2.123
```
#### Known bugs / problems
Currently, no keep-alive frames are sent and the minimum inter-frame-time is disregarded.
### The `midi` backend
The MIDI backend provides read-write access to the MIDI protocol via virtual ports.
#### Global configuration
| Option | Example value | Default value | Description |
|---------------|-----------------------|-----------------------|-----------------------|
| `name` | `MIDIMonster` | none | MIDI client name |
#### Instance configuration
| Option | Example value | Default value | Description |
|---------------|-----------------------|-----------------------|-----------------------|
| `read` | `20:0` | none | MIDI device to connect for input |
| `write` | `DeviceName` | none | MIDI device to connect for output |
MIDI device names may either be `client:port` portnames or prefixes of MIDI device names.
#### Channel specification
The MIDI backend supports multiple channel types
* `cc` - Control Changes
* `note` - Note On/Off messages
* `nrpn` - NRPNs (not yet implemented)
A channel is specified using `<type><channel>.<index>`.
Example mapping:
```
midi1.cc0.9 = midi2.note1.4
```
#### Known bugs / problems
Currently, no Note Off messages are sent (instead, Note On messages with a velocity of 0 are
generated, which amount to the same thing according to the spec). This may be implemented as
a configuration option at a later time.
NRPNs are not yet fully implemented, though rudimentary support is in the codebase.
The channel specification syntax is currently a bit clunky.
### The `osc` backend
TBD
## Building
This section will explain how to build the provided sources to be able to run
`midimonster`.
### Prerequisites
In order to build the MIDIMonster, you'll need some libraries that provide
support for the protocols to translate.
* libasound2-dev (for the MIDI backend)
* A C compiler
* GNUmake
### Build
Just running `make` in the source directory should do the trick.
## Development
The architecture is split into the `midimonster` core, handling mapping
and resource management, and the backends, which are shared objects loaded
at start time, which provide a protocol mapping to instances / channels.
The API and structures is more-or-less documented in (midimonster.h)[midimonster.h],
more detailed documentation may follow.
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