[directmusic] Re: Ciaran - you mentioned...

  • From: "Ciaran Walsh" <ciaran@xxxxxxxxxxxxxx>
  • To: <directmusic@xxxxxxxxxxxxx>
  • Date: Thu, 27 Feb 2003 16:52:12 -0000

thanks Scott - I was a bit confused there ;)

-----Original Message-----
From: directmusic-bounce@xxxxxxxxxxxxx
[mailto:directmusic-bounce@xxxxxxxxxxxxx]On Behalf Of Scott Morgan
Sent: 27 February 2003 16:32
To: directmusic@xxxxxxxxxxxxx
Subject: [directmusic] Re: Ciaran - you mentioned...



The Autodownload feature Todor is referring to is a C++ method that has
nothing to do with the download checkbox in scripts.  The programmer would
be the person who decides to use AutoDownload, not the composer.  Just so
you know DMDemo does not use Autodownload.  Typically if you are using
scripting there is absolutely no need to use AutoDownload since the script
handles everything either through manual script commands or by loading what
it needs at start (only once).

There are periodic CPU spikes in DMusic playback, but my understanding is
that it is the playback engine waking up every so often and writing new data
to the sound buffer.

-Scott Morgan
http://Morganstudios.com


----- Original Message -----
From: "Ciaran Walsh" <ciaran@xxxxxxxxxxxxxx>
To: <directmusic@xxxxxxxxxxxxx>
Sent: Thursday, February 27, 2003 7:34 AM
Subject: [directmusic] Re: Ciaran - you mentioned...


>
> that would definitely explain it - does it really download the instruments
> again every time you play a band? that seems like a really weird way for
it
> to work...
>
> I thought the point of AutoDownload was so that all content referenced by
> the script was downloaded when the script loaded.
>
> -----Original Message-----
> From: directmusic-bounce@xxxxxxxxxxxxx
> [mailto:directmusic-bounce@xxxxxxxxxxxxx]On Behalf Of Todor Fay
> Sent: 27 February 2003 15:18
> To: directmusic@xxxxxxxxxxxxx
> Subject: [directmusic] Re: Ciaran - you mentioned...
>
>
>
> Is there any chance you had the AutoDownload command turned on? It's a
> feature that would cause each band to automatically cause a download of
> its instruments when it played. Playback of a band should normally not
> cause any spike because all it does is send program change events to the
> synth which just stores them, so nothing active occurs.
>
> Todor
>
> -----Original Message-----
> From: directmusic-bounce@xxxxxxxxxxxxx
> [mailto:directmusic-bounce@xxxxxxxxxxxxx] On Behalf Of Ciaran Walsh
> Sent: Thursday, February 27, 2003 5:32 AM
> To: directmusic@xxxxxxxxxxxxx
> Subject: [directmusic] Re: Ciaran - you mentioned...
>
>
> The problem we were having was never pinned down 100% to one particular
> thing, but band events certainly seemed to be contributing
> significantly.
> Our performance tests showed big CPU spikes each time a segment was
> triggered with a new band event, and somehow there was a cumulative
> effect
> which had a big impact on the overall frame rate.
>
> When we removed band events from the segments the spikes disappeared.
>
> We defined the band globally by having a segment play right at the start
> containing just a band event and triggering the first Primary Segment.
> As
> long as you don't recreate the audiopath or change any band settings you
> don't need to create the band again after that. I guess it's only a
> problem
> if you are re-assigning pchannels as you go along, but I've never needed
> to
> do that.
>
> Hope that helps,
> Ciaran
>
> -----Original Message-----
> From: directmusic-bounce@xxxxxxxxxxxxx
> [mailto:directmusic-bounce@xxxxxxxxxxxxx]On Behalf Of Paul Stroud
> Sent: 27 February 2003 10:59
> To: directmusic@xxxxxxxxxxxxx
> Subject: [directmusic] Ciaran - you mentioned...
>
>
>
> ..that band tracks were giving you and your dev team a few problems -
> causing some glitch?
>
> If you don't mind going over the same subject again; what was the
> problem?
> And how did you sort it?
>
> I seem to remember that you globally declared a band instead of use band
> tracks on each segment.  Is this right?  Did you need to play a Band
> track
> at least once?  Is this how you globally declare a band?
>
> Anyone else had problems with this sort of thing?
>
>
>
>
>
>



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