| 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@hidden> 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.
On Jul 20, 2016, at 6:31 AM, Marcin Rakowski < email@hidden> 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 _____________________________________ "There are many paths, but only one journey."
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