[directmusic] Re: Why can't I get MIXIN_BUFFER interfaces?
- From: "James Dooley" <jdooley@xxxxxxxxxxxxx>
- To: <directmusic@xxxxxxxxxxxxx>
- Date: Fri, 27 Sep 2002 13:39:58 -0700
This is a nuance of the GetObjectInPath method. Mixin buffers aren't
channel specific, so you need to pass 0 instead of DMUS_PCHANNEL_ALL for
dwPChannel. It does say this in the "Remarks" section of the
documentation for IDirectMusicAudioPath8::GetObjectInPath, but it's easy
to miss. You have to notice that DMUS_PATH_MIXIN_BUFFER is not in the
list of channel-specific stages (which means that you must pass 0 for
dwPChannel when using that stage).
-james
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-----Original Message-----
From: Andrew Clark [mailto:andrewclarkis@xxxxxxxxxxx]=20
Sent: Friday, September 27, 2002 12:53 PM
To: directmusic@xxxxxxxxxxxxx
Subject: [directmusic] Why can't I get MIXIN_BUFFER interfaces?
Hey gang! Another DX8.1 API question for the c++ gurus.
I don't seem to be able to get MIXIN_BUFFER interfaces with=20
pAudiopath->GetObjectInPath(). Here is the audiopath I'm trying to use:
Audiopath Designer:
Mix Group Bus Buffer Effects List
Shared Verb---- None User Defined (shared) I3DL2Reverb2
Shared Echo---- None User Defined (shared) Echo1 | Send(Shared
Verb)
1: Mix Group--- Stereo User Defined Custom DMO | Send
(Shared Verb) | Send=20
(Shared Echo)
I can get an interface to my custom DMO no problem with=20
GetObjectInPath(DMUS_PATH_BUFFER_DMO), but try as I might I can't get an
interface to the Echo1 DMO with DMUS_PATH_MIXIN_BUFFER_DMO. As a matter
of=20
fact, I can't even get an IDirectSoundBUffer interface with=20
DMUS_PATH_MIXIN_BUFFER.
Does anyone have any idea what might be going on? (Is it because I have
the=20
buffer flagged as shared between audiopaths?)
Cheers,
Andrew
--------------------------------------------------------
sample code that doesn't work:
IDirectSoundBuffer* pBuff =3D NULL;
if(SUCCEEDED(hr =3D pAudioPath->GetObjectInPath(DMUS_PCHANNEL_ALL,
DMUS_PATH_MIXIN_BUFFER, i,
GUID_NULL, 0, IID_IDirectSoundBuffer,
(LPVOID*) &pBuff)))
{
Log("For some reason this never happens.");
}
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