Support for ASID playback over MIDI, interfacing SIDs on hardware (#178)

[micheldebree]

• When new configuration item is set to a MIDI interface name, ASID will be sent out in parallel with the reSID audio
• Tested with MacOS and Windows
• Non-tested support for Linux included
• Based on compiled-in RtMidi
• Fixes #28

TODO:

• [x] Toggle ReSID/ASID from the UI
  • [x] Mute/init ASID when switching off/on
  • [x] Visual feedback
• [ ] Stop sending messages to ASID when SF2 is not playing
• [ ] Use a default MIDI device if configured device is not found

Documentation

• MIDI interface must be selected with Playback.ASID.MidiInterface config option in the user.ini
• Switch between RESID and ASID with Alt-O (visible in top bar. If it doesn't change, there is no MIDI device found)

Example for macOS

In ~/.config/sidfactory2/user.ini:

Playback.ASID.MidiInterface = "MIDISPORT 2x2 Port A"

A way to find out the available values, is to run SF2 from the terminal and check the logging:

/Applications/SIDFactoryII.app/Contents/MacOS/SIDFactoryII

2024-07-02 11:03:49.665 SIDFactoryII[56993:1090015] INFO: [FOUND] MIDI output port 0: MPK Mini Mk II
2024-07-02 11:03:49.665 SIDFactoryII[56993:1090015] INFO: [FOUND] MIDI output port 1: MiniFuse 4
2024-07-02 11:03:49.665 SIDFactoryII[56993:1090015] INFO: [FOUND] MIDI output port 2: MIDISPORT 2x2 Port A
2024-07-02 11:03:49.665 SIDFactoryII[56993:1090015] INFO: [FOUND] MIDI output port 3: MIDISPORT 2x2 Port B

[micheldebree]

About the toggle:

• We can have a toggle in the statusbar to select ReSID and/or ASID, similar to the other toggles in the status bar
  • values: ReSID/ASID/ReSID+ASID
  • What do we call it? Device? Engine?
  • Combination settings will explode if we ever introduce another engine
• We can have a toggle per 'engine'
  • ReSID On/Off and ASID On/Off
  • Both off is a nonsense setting
• For ASID, SID model is n.a., do we disable that toggle when ASID is selected?