Hi Cara,
I looked through the example you described
(UsinganAUGraphwiththeMulti-ChannelMixerandRemoteIOAudioUnit). In the following
section it is decided wich audio data is played:
Float32 *outA = (Float32 *)ioData->mBuffers[0].mData; // output audio buffer
for L channel
Float32 *outB = (Float32 *)ioData->mBuffers[1].mData; // output audio
buffer for R channel
// for demonstration purposes we've configured 2 stereo input busses for
the mixer unit
// but only provide a single channel of data from each input bus when asked
and silence for the other channel
// alternating as appropriate when asked to render bus 0 or bus 1's input
for (UInt32 i = 0; i < inNumberFrames; ++i) {
if (1 == inBusNumber) {
outA[i] = 0;
outB[i] = in[sample++];
} else {
outA[i] = in[sample++];
outB[i] = 0;
}
if (sample > bufSamples) {
// start over from the beginning of the data, our audio simply loops
printf("looping data for bus %d after %ld source frames
rendered\n", (unsigned int)inBusNumber, (long)sample-1);
sample = 0;
}
}
Larissa
> Am 01.02.2016 um 18:52 schrieb Cara Quinn <[email protected]>:
>
> Larissa,
>
> Thank you very much for this.
>
> I understand the concept of connecting nodes in an auGraph, so your code
> makes perfect sense.
>
> What I have not seen in the sample code is how to assign a specific audio
> stream to a specific mixer input element.
>
> If you like, please see my earlier note to Mahboud for some clarification on
> what I am doing.
>
> Let me revisit the AUGraphConnectNodeInput function to see if I am
> overlooking something basic here and perhaps I can find what I need or at
> least ask a better question.
>
> I sure don’t want to waste your and others time. :)
>
> Thanks so much for your note. You may have given me the direction I need.
>
> Cheers!
>
> Cara
> ---
> iOS design and development - LookTel.com
> ---
> View my Online Portfolio at:
>
> http://www.onemodelplace.com/models/Cara-Quinn
>
> Follow me on Twitter!
>
> https://twitter.com/ModelCara
>
> On Feb 1, 2016, at 5:05 AM, Larissa Laich <[email protected]> wrote:
>
> 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
>> ---
>> iOS design and development - LookTel.com
>> ---
>> View my Online Portfolio at:
>>
>> http://www.onemodelplace.com/models/Cara-Quinn
>>
>> Follow me on Twitter!
>>
>> https://twitter.com/ModelCara
>>
>>
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