If I understand the issue correctly to the best of my knowledge you should
create another mixer input buss and add the render callback to the graph. You
can not have a render callback on the same input that you are using for the
AudioFilePlayer AU.
Here is a snippet from some test code I have that renders multiple tracks of
audio using graph render callbacks.
UInt32 inputBuss = 0;
for (int t=0; t < trackCount; ++t)
{
AURenderCallbackStruct input;
input.inputProc = AudioTrackRenderProc;
input.inputProcRefCon = &tracks[t];
CheckError(AudioUnitSetProperty(mixerUnit,
kAudioUnitProperty_StreamFormat,
kAudioUnitScope_Input, inputBuss,
streamFormat, sizeof(AudioStreamBasicDescription)),
"Failed to set mixer buss input stream format.\n");
AUGraphSetNodeInputCallback(graph, mixerNode, inputBuss, &input);
++inputBuss;
}
And whatever you do, don’t forget to match the steam formats or you may get an
earful of noise that you won’t soon forget.
Hope this helps.
- Matt
> On Jul 20, 2016, at 12:20 PM, Matt Grippaldi <[email protected]>
> wrote:
>
> If I understand the issue correctly to the best of my knowledge you should
> create another mixer input buss and add the render callback to the graph.
> You can not have a render callback on the same input that you are using for
> the AudioFilePlayer AU.
> Here is a snippet from some test code I have that renders multiple tracks of
> audio using graph render callbacks.
>
> UInt32 inputBuss = 0;
> for (int t=0; t < trackCount; ++t)
> {
> AURenderCallbackStruct input;
> input.inputProc = AudioTrackRenderProc;
> input.inputProcRefCon = &tracks[t];
>
> CheckError(AudioUnitSetProperty(mixerUnit,
> kAudioUnitProperty_StreamFormat,
> kAudioUnitScope_Input, inputBuss,
> streamFormat, sizeof(AudioStreamBasicDescription)),
> "Failed to set mixer buss input stream format.\n");
> AUGraphSetNodeInputCallback(graph, mixerNode, inputBuss, &input);
> ++inputBuss;
> }
>
> And whatever you do, don’t forget to match the steam formats or you may get
> an earful of noise that you won’t soon forget.
>
> Hope this helps.
>
> - Matt Grippaldi
>
>
>
>
>
>
>
>
>
>
>> On Jul 20, 2016, at 6:31 AM, Marcin Rakowski <[email protected]
>> <mailto:[email protected]>> wrote:
>>
>> Hi, I have a graph in which two separate AudioFilePlayer AUs are feediing
>> into a Mixer unit that then outputs to Output unit. It works fine.
>>
>> Then I set up a render callback on the Mixer unit, but it never gets called.
>>
>> AURenderCallbackStruct input;
>>
>> input.inputProc = SineWaveRenderProc;
>>
>> input.inputProcRefCon = &mixerCallback;
>>
>> CheckError(AudioUnitSetProperty(mixerUnit,
>>
>> kAudioUnitProperty_SetRenderCallback,
>>
>> kAudioUnitScope_Output,
>>
>> 0,
>>
>> &input,
>>
>> sizeof(input)),
>>
>> "AudioUnitSetProperty failed");
>>
>>
>> Is this expected behaviour? The mixer is receiving samples on both inputs.
>> Is there a way to switch where the unit is pulling data from, ie. inputs or
>> RenderCallback?
>>
>> --
>>
>> Marcin
>> http://google.com/+MarcinRakowskiConnect
>> <http://google.com/+MarcinRakowskiConnect>
>> _____________________________________
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