Re: [Denemo-devel] staff midi fields

[Jeremiah Benham]

Sent from my iPhone

On Dec 9, 2009, at 3:48 AM, Richard Shann <address@hidden>  
wrote:

> I was going to upgrade the Drum Clef selection to set channel 9/10 on
> the staff and realized that I have to sort out the built-in staff  
> prefs
> for this.
> My proposal is that
>
> the staff->midi_instrument selection  will create a staff directive
> changing the program to 9/10 and (as a caching mechanism set the
> staff->midi_prognum field). The staff->midi_instrument field itself  
> will
> go as well as the staff->midi_override field.
> A script setting the program select will also write the
> staff->midi_prognum so that playback immediately can just look this up
> (as it does at present) rather than having to search for a staff
> directive,
> The special code setting the prognum, get_midi_prognum() will go, as
> will the get_midi_channel() - this last tries to find "drums" but as
> that is not in the list of instruments, it never actually sets channel
> 9/10 (AFAIK).
> The instrument name is being sent as meta data. We could use the  
> prognum
> and the array (in midi.c) to get this string and send it. But it might
> be better to leave this to the user (i.e. a scripted decision).
>
> Question: how does this tie-in with the JACK stuff???

Jackmidi is not doing anything with program number. During midi  
playback It is getting the channel number from smf. On scripted  
playback it gets this info via the get_midi_channel function. I don't  
have the code in front of me at the moment so this may be intention  
rather than what is actually written. I am at the point that I want to  
start wiring device_number and port_number to jackmidi output. I was  
thinking of adding some integers to the smf event structure to  
represent device_number (Jack client number) and port number. I would  
also need to modify export midi to set this data in smf event  
structure. Do you think this is the correct approach. On immediate and  
scripted playback this data can be attained from the denemo staff  
properies structure.

Jeremiah


> Richard
>
>
>
>
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