Mailing Lists: Apple Mailing Lists
 Image of Mac OS face in stamp
Re: Quick question on configuring an AU for a certain channel config
[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: Quick question on configuring an AU for a certain channel config

Hi, 

very interesting thread, I'm trying to get sidechains to work too.

As far as I understand right now, to get access to audio from the second input (bus 1) there are 2 ways :

AudioBufferList sidechainBufferList = theSidechainInput->GetBufferList();

or :  float* scChannelPtr = theSidechainInput->GetChannelData(0);


In my AU this works both, when I process in mono with channel layout { 1, 1 }.

Now, when I test my channel layout for stereo  { 2, 2 } something strange happens:

The AudioBufferList tells me, that there are 2 buffers, as expected. But when I access them both with

float* sidechainInputL = (Float32*)sidechainBufferList.mBuffers[0].mData;
float* sidechainInputR = (Float32*)sidechainBufferList.mBuffers[1].mData;

the second one ( Right ) does not contain audiodata. It seems like it points to some wrong place.

When I use  float* scChannelPtrL = theSidechainInput->GetChannelData(0);
float* scChannelPtrR = theSidechainInput->GetChannelData(1);

everything is fine and I hear the sidechain Input in stereo.

Does anybody know how that ? Is  GetChannelData(n) the prefered way ?

Another thing, that I do not realy understand is that my AU passes auval test, and it works fine in logic8, but auval gives me a warning :

WARNING: AU Reports Processing in Place; Input buffer[0]:0xcf000 and Output buffer[0]:0xc7000 are not the same

I searched the list and had a look at AUEffectBase but did not find anytthing. I just found, that when I use 

SetProcessesInPlace( FALSE ); 


in Initialize() than there is no warning in auval.

What is  mProcessesInPlace for ? Do I have to set it to false when I override Render() instead of using kernels or ProcessBufferList() ?


Thanks

Bernd



Bill and Sophia,

thank you so much for your help!! I'll try your suggestions and see if
they work for me.

Thanks again,
--th



 _______________________________________________
Do not post admin requests to the list. They will be ignored.
Coreaudio-api mailing list      (email@hidden)
Help/Unsubscribe/Update your Subscription:

This email sent to email@hidden
References: 
 >Re: Quick question on configuring an AU for a certain channel config (From: "Sophia Poirier [dfx]" <email@hidden>)
 >Re: Quick question on configuring an AU for a certain channel config (From: "tahome izwah" <email@hidden>)



Visit the Apple Store online or at retail locations.
1-800-MY-APPLE

Contact Apple | Terms of Use | Privacy Policy

Copyright © 2011 Apple Inc. All rights reserved.