[directmusic] Re: question
- From: "Scott Morgan" <scott@xxxxxxxxxxxxxxxxx>
- To: <directmusic@xxxxxxxxxxxxx>
- Date: Thu, 27 Feb 2003 19:13:10 -0800
Right now there's not much out there except for what you can find online.
There are some articles at:
http://msdn.microsoft.com/directx
Go to Graphics and Multimedia/DirectX/Technical Articles/DirectMusic
There's a tiny bit of stuff in Teach yourself DirectX 7 in 24 hours. I
wouldn't buy the book for it though.
There's also another book called Game Audio Programming, but I thnk it just
focuses on the programming :)
The book Todor mentioned will have a considerable amount of good content in
it from various authors. For now the web, DMP help, and this list are
you're best bets.
Oh, if you have the Demo8 project installed I recommend you go through that
using the bookmarks. That's a really helpful tutorial.
I can't seem to find the web link to it anymore
It was on the DX8.1 CD.
E:\DXF\DXSDK\essentls\DMusProd\DemoContent\DMPDemoContent.exe
-Scott Morgan
http://Morganstudios.com
----- Original Message -----
From: "justin" <jlove@xxxxxxx>
To: <directmusic@xxxxxxxxxxxxx>
Sent: Thursday, February 27, 2003 6:44 PM
Subject: [directmusic] Re: question
>
> Thanks for the info. I look forward to the book. I have decided to
> specialize in game audio programming (although I am just getting
> started) and it's nice to see that more books are being written on the
> subject
>
> I am having a particularily hard time finding info/tutorials for
> DirectMusic Producer outside of those that came with the software. Any
> suggestions?
>
> Justin Love
> University of Victoria
>
> -----Original Message-----
> From: directmusic-bounce@xxxxxxxxxxxxx
> [mailto:directmusic-bounce@xxxxxxxxxxxxx] On Behalf Of Todor Fay
> Sent: February 27, 2003 6:29 PM
> To: directmusic@xxxxxxxxxxxxx
> Subject: [directmusic] Re: question
>
>
> With DX8, using DirectMusic for sound effects had a problem: you
> couldn't get low latency for sudden sound effects, in particular any
> sounds that are in reaction to user input (like gun shots, etc.)
>
> In DX9, you get really low latency. I've measured 4ms latency on the
> Creative Audigy card, for example, so it's a totally different story.
>
> By default, however, the latency is not low. This was done to handle
> worse case scenarios of really lousy cards on old slow computers.
>
> But, you can overwrite the latency and write period. Note that the
> latency is added to whatever hardware / software latency is introduced
> by the drivers, so results will vary depending on the card. The
> following code drops the latency to 1ms and the period to 3ms. This
> results in about 4-6 ms latency on an Audigy card:
>
> IDirectMusicAudioPath *pPath;
> if (m_pPerformance &&
> SUCCEEDED(m_pPerformance->GetDefaultAudioPath(&pPath)))
> {
> IKsControl *pControl = NULL;
>
> pPath->GetObjectInPath(0,DMUS_PATH_PORT,0,GUID_All_Objects,0,IID_IKsCont
> rol,(void **)&pControl);
> pPath->Release();
> if (pControl)
> {
> KSPROPERTY ksp;
> DWORD dwData;
> ULONG cb;
> dwData = 3;
> ksp.Set = GUID_DMUS_PROP_WritePeriod ;
> ksp.Id = 0;
> ksp.Flags = KSPROPERTY_TYPE_SET;
> pControl->KsProperty(&ksp, sizeof(ksp),
> &dwData, sizeof(dwData), &cb);
> dwData = 1;
> ksp.Set = GUID_DMUS_PROP_WriteLatency ;
> ksp.Id = 1;
> ksp.Flags = KSPROPERTY_TYPE_SET;
> pControl->KsProperty(&ksp, sizeof(ksp),
> &dwData, sizeof(dwData), &cb);
> pControl->Release();
> }
> }
>
> BTW, A bunch of us are contributing to a book called DirectX Audio
> Exposed that will ship in a few months. In it, I have written a chapter
> on programming with sound effects that covers this and most other
> questions and issues.
>
> Todor
>
>
> -----Original Message-----
> From: directmusic-bounce@xxxxxxxxxxxxx
> [mailto:directmusic-bounce@xxxxxxxxxxxxx] On Behalf Of justin
> Sent: Thursday, February 27, 2003 11:59 AM
> To: directmusic@xxxxxxxxxxxxx
> Subject: [directmusic] question
>
>
> Hi everyone,
>
> I am working on creating adaptive audio for a DX game and I am using
> direct music to handle all of the aa. I was wondering if it was ok to
> use direct music for all the sounds in the game i.e gunshots or if I
> should use direct sound to deal with the small one off stuff...
>
> Justin Love
> University of Victoria
>
> -----Original Message-----
> From: directmusic-bounce@xxxxxxxxxxxxx
> [mailto:directmusic-bounce@xxxxxxxxxxxxx] On Behalf Of Scott Morgan
> Sent: February 27, 2003 8:47 AM
> To: directmusic@xxxxxxxxxxxxx
> Subject: [directmusic] Re: Ciaran - you mentioned...
>
>
> Oh FYI, the point of the C++ Autodownload is to make life easier on the
> programmer. It means he doesn't have to load and unload every segment
> he
> calls play on. It's all handled automatically.
> -Scott Morgan
> http://Morganstudios.com
>
>
> ----- Original Message -----
> From: "Scott Morgan" <scott@xxxxxxxxxxxxxxxxx>
> To: <directmusic@xxxxxxxxxxxxx>
> Sent: Thursday, February 27, 2003 8:31 AM
> 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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>
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