Hi Cara,
I create a mixer node with kAudioUnitSubType_MultiChannelMixer in the audio
component description. When you say "channel“, are you talking about elements?
An element is a programmatic context which is nested within an audio scope. It
is analogous to a signal bus in a physical device (if it is a part of input or
output scope) and that’s the reason why it is sometimes also called a bus.
For example you can connect your output node (bus 0 (in output scope) is
directly connected to the speaker) with your mixer node like that:
CheckError(AUGraphConnectNodeInput(self->graph, mainMixerNode, 0,
outputNode, 0),
"Couldn't connect mixer output on bus 0 to input scope bus 0 of
outputNode");
Best,
Larissa
> Am 01.02.2016 um 05:46 schrieb Cara Quinn <[email protected]>:
>
> Hello All, firstly thanks for this list!
>
> My apologies for such a basic mixer question but I have been tasked with
> writing a VOIP application and have had no previous experience with audio
> units until just recently.
>
> I am needing to add multi-channel support to the VOIP app at the moment so am
> researching the standard multi-channel mixer audio unit.
>
> I have looked at some sample code (both from Apple and from third parties) to
> get an idea of what is happening and mostly get what is going on with one
> exception.
>
> I cannot for the life of me, figure out where the channel or bus assignments
> are happening. I.E. if I have several audio streams, and I wish to assign
> each stream to a specific mixer input I cannot see where this is happening in
> any of the examples I am looking at.
>
> Also, I have seen people say online that the busses and mixer channels are
> two different concepts but again, I cannot see in the code where this is
> demonstrated. So any help on the correct paradigm I should be thinking of
> this in terms of, would greatly be appreciated.
>
> I am sure I must be overlooking something basic here so if anyone can point
> me in the right direction I would sure be grateful! :)
>
> Thanks so much and please do have a great day!
>
> Cheers!
>
> Cara
> ---
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>
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>
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