[Vm-dev] Mac OS Cocoa MIDI Plugin

[Bert Freudenberg]

> On 12.05.2016, at 15:22, Craig Latta <craig at blackpagedigital.com> wrote:
> 
> 
> 
> Hi Eliot--
> 
>> recently the Cog VM on Mac OS X moved to Cocoa, the Objective-C API
>> for the platform, leaving behind the old Carbon C API.  There is some
>> backward compatibility support but it is gradually being deprecated by
>> Apple.  One victim is the MIDIPlugin which was written against a
>> ComponentManager API that, while Apple docs say is only deprecated,
>> has actually disappeared.  Consequently the MIDIPlugin support
>> (see http://www.squeakvm.org/svn/squeak/branches/Cog/platforms
>> /iOS/plugins/MIDIPlugin) needs completely rewriting to use Cocoa
>> APIs.  I've recently changed the build so that the MIDIPlgin is built
>> externally, which will make it easier to work on; one doesn't need to
>> build the entire VM, only the plugin.  I'm looking for volunteers who
>> a) love music/know MIDI
>> b) are happy programming at the Objective-C level using command-line
>> builds and perhaps Xcode, but more immediately lldb for debugging.
>> 
>> If interested, reply to vm-dev and we can continue discussions there;
>> there are folks that can help with Mac OS support, but no one I know
>> of that has time to write this rather important plugin for multi-
>> media.  It would be a great shame to lose MIDI on Mac.
> 
>     Perhaps this is an opportunity to reduce the platform code fanout a
> bit. I've had good results with Squeak MIDI before on Mac, Windows, and
> Linux, by making a VM plugin from the platform-independent PortMedia
> libraries (PortAudio and PortMidi), at [1]. Perhaps it would make sense
> to use PortMedia in combination with FFI/Alien these days.
> 
> 
> -C
> 
> [1] http://portmedia.sourceforge.net

Why not re-implement MIDIPlugin in terms of PortMidi? That way even older images would benefit.

- Bert -



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