[gmpi] Re: 3.15 MIDI
- From: Mike Berry <mberry@xxxxxxxxx>
- To: gmpi@xxxxxxxxxxxxx
- Date: Tue, 15 Jun 2004 16:03:01 -0600
Martijn Sipkema wrote:
[...]
And I still haven't seen a good reason for only having a single control
protocol...
Let me try to give you a good reason. Lets say I am a synthesizer
plugin, one sine wave oscillator, which takes a note on of a specific
pitch. So lets say the host can pass GMPI events and MIDI mixed together.
For GMPI events, the note on has a frequency attached which tells me
what frequency to generate. For the MIDI, I get a note number, which I
need to translate into a frequency.
So how do I translate note numbers into frequency? Well, I use a look
up table. Uh-oh, that's the same way that the host translates note
numbers into GMPI events with frequency. Presto, either there are two
table which the user has to set independently, or the plugin and host
have to share a translation table. And this is a really simple situation.
--
Mike Berry
Adobe Systems
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