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Re: [Denemo-devel] A small note on whats crippling Denemos playback

From: Nils Gey
Subject: Re: [Denemo-devel] A small note on whats crippling Denemos playback
Date: Mon, 14 Feb 2011 01:55:25 +0100

Helping hands from #lad relayed the following message to this mailing list:

(23:45) ( larsl) (midi-)Sequencing really needs to be done in a separate thread.
 But if it isn't designed for thread-safety to begin with it would probably be 
lots of work to graft   it on now.

(00:19) ( torbenh3) what it was ? i just told you its all wrong, and needs 
if you recall, i changed the whole render engine .. getting that midi thing 
right, is more complicated.

(23:37) ( petern_) hmm, odd
all midi events are sent at frame 0. so that's not going to help to start with. 
it needs to be related to the event time.  imagine a period size of 2048 
therefore it could only send a lump of events every 46ms (@44100Hz)
on top of that the gui has to be idle. it only plays midi events when gtk is 
so if there's lots going on on screen, it won't be very idle
in fact it always plays events after they should've happened
it waits for the event's timestamp to pass, then it writes it to a buffer
the process callback picks it up from that buffer in the next cycle and plonks 
it at frame 0
unfortunately, although i can see what it's doing quite easily, it's not so 
easy to fix :(

On Sun, 13 Feb 2011 23:27:52 +0100
Nils Gey <address@hidden> wrote:

> View->Score View off. 
> Playback is correct this way. As usual, I don't know much about the internals.
> On Sun, 13 Feb 2011 22:16:56 +0000
> Richard Shann <address@hidden> wrote:
> > On Sun, 2011-02-13 at 23:02 +0100, Nils Gey wrote:
> > > 
> > > So something is fundamentally wrong in the playback/visual part.
> > 
> > This is View->Score view
> > toggled off?
> > To make it clear, what this does is hide the widget which has the the
> > drawing queued by the routine that is responding to a request for more
> > midi data for the synth.
> > 
> > Richard
> > 
> > 
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> Denemo-devel mailing list
> address@hidden

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