MIDI, audio interfaces, etc.

> 1) What's the best way to get MIDI in and out of Squeak on a Mac (or if
> there's a platform independent approach, that's going to be ideal for me.)

Class SimpleMIDIPort does the job; it's platform independent.

Stef

On 13-06-2013, at 1:06 PM, Stéphane Rollandin <[hidden email]> wrote:

>> 1) What's the best way to get MIDI in and out of Squeak on a Mac (or if
>> there's a platform independent approach, that's going to be ideal for me.)
>
> Class SimpleMIDIPort does the job; it's platform independent.

Works ok on Macs, appear not to work so well on unices. At least, the standard MIDI instrument parts don't. And the code seems to have some internal inconsistencies. If anyone is familiar with making ALSA MIDI work, I'd be very happy to hear about it.

tim
--
tim Rowledge; [hidden email]; http://www.rowledge.org/tim
"How many Kzin does it take to change a lightbulb?" "None. You can scream and leap in the dark."

>> Class SimpleMIDIPort does the job; it's platform independent.
>
> Works ok on Macs, appear not to work so well on unices.

Yes, it's been broken for a long time in Linux.

Stef

On 14-06-2013, at 1:18 AM, karl ramberg <[hidden email]> wrote:

> http://wiki.squeak.org/squeak/476
>
>
> Some music info here

Thanks - that's one of the better swiki pages that I've seen recently; we need a lot of work to clean up!

I haven't spotted anything yet that helps me understand the problems with unix MIDI though. Is there really no one here with any experience?

Just looking at the code without any prior knowledge of how MIDI is supposed to work, I'm puzzled by (in platforms/unix/plugins/MIDIPlugin/sqUnixMIDIALSA.inc)  

int sqMIDIGetPortCount(void)
{
  debugf("sqMIDIGetPortCount\n");
  success(true);
  return 1;
}

/* Return an integer indicating the directionality of the given
   port where: 1 = input, 2 = output, 3 = bidirectional.  Fail if
   there is no port of the given number.
*/
int sqMIDIGetPortDirectionality(int portNum)
{
  switch (portNum)
    {
    case 0: return 2;
    case 1: return 1;
    }
  return interpreterProxy->success(false);
}

Note how the getcount returns 1, which appears to result in a single port known as port *0* and yet getportdirectionality expects to answer for port 0 and port 1. getportname also appears to expect port 0 or port 1 and further confsed me by in use returning sometihng like 'tN1in' as a port name and I can't see how the code would produce that…

It gets more confusing after that.


tim
--
tim Rowledge; [hidden email]; http://www.rowledge.org/tim
Strange OpCodes: GLV: Ground the Line Voltage