Spotify iOS SDKで2つのAUNodeを混ぜる

Question

ダイナミックプロセッサと複数のフィルタを使用して、特定の周波数帯域を特定の方法で圧縮しようとしていますconnectOutputBuskAudioUnitSubType_MultiChannelMixerのノードのみを混合すると、最初の追加されたノードが出てくる。

OBS：私は実際にsouceNodeに圧縮されますfreqsを削除するsourceNodeCopyにフィルタを使用しますが、私はそれらを省略し、短いものを維持します。ここで

コードです：あなたが同じ入力にこれを行う場合は、この

AUGraphConnectNodeInput(graph, sourceNodeCopy, sourceOutputBusNumber, mixerNode, 0) 
AUGraphConnectNodeInput(graph, fiterNode, sourceOutputBusNumber, mixerNode, 0) 

、あなたが接続されますsourceNodeCopyとfilterNodeのようにノードを接続して、あなたのコードで

override func connectOutputBus(_ sourceOutputBusNumber: UInt32, ofNode sourceNode: AUNode, toInputBus destinationInputBusNumber: UInt32, ofNode destinationNode: AUNode, in graph: AUGraph!) throws { 

    let sourceNodeCopy = sourceNode //original node without the harsh freq 

    //create a filter for the harsh frequencies 
    var filterDescription = AudioComponentDescription() 
    filterDescription.componentType = kAudioUnitType_Effect 
    filterDescription.componentSubType = kAudioUnitSubType_BandPassFilter 
    filterDescription.componentManufacturer = kAudioUnitManufacturer_Apple 
    filterDescription.componentFlags = 0 
    filterDescription.componentFlagsMask = 0 

    AUGraphAddNode(graph, &filterDescription, &filterNode!) // Add the filter node 
    AUGraphNodeInfo(graph, filterNode!, nil, &filterUnit!) // Get the Audio Unit from the node 
    AudioUnitInitialize(filterUnit!) // Initialize the audio unit 
    // Set filter params 
    AudioUnitSetParameter(filterUnit!, kBandpassParam_CenterFrequency, kAudioUnitScope_Global, 0, 10038, 0) 

    //create a processor to compress the frequency 
    var dynamicProcessorDescription = AudioComponentDescription() 
    dynamicProcessorDescription.componentType = kAudioUnitType_Effect 
    dynamicProcessorDescription.componentSubType = kAudioUnitSubType_DynamicsProcessor 
    dynamicProcessorDescription.componentManufacturer = kAudioUnitManufacturer_Apple 
    dynamicProcessorDescription.componentFlags = 0 
    dynamicProcessorDescription.componentFlagsMask = 0 

    // Add the dynamic processor node 
    AUGraphAddNode(graph, &dynamicProcessorDescription, &dynamicProcessorNode) 
    AUGraphNodeInfo(graph, dynamicProcessorNode, nil, &dynamicProcessorUnit) 
    AudioUnitInitialize(dynamicProcessorUnit!) 

    // Set compressor params 
    AudioUnitSetParameter(dynamicProcessorUnit!, kDynamicsProcessorParam_Threshold, kAudioUnitScope_Global, 0, -35, 0) 
    AudioUnitSetParameter(dynamicProcessorUnit!, kDynamicsProcessorParam_AttackTime, kAudioUnitScope_Global, 0, 0.02, 0) 
    AudioUnitSetParameter(dynamicProcessorUnit!, kDynamicsProcessorParam_ReleaseTime, kAudioUnitScope_Global, 0, 0.04, 0) 
    AudioUnitSetParameter(dynamicProcessorUnit!, kDynamicsProcessorParam_HeadRoom, kAudioUnitScope_Global, 0, 0, 0) 

    //mixer 
    var mixerDescription = AudioComponentDescription() 
    mixerDescription.componentType = kAudioUnitType_Mixer 
    mixerDescription.componentSubType = kAudioUnitSubType_MultiChannelMixer 
    mixerDescription.componentManufacturer = kAudioUnitManufacturer_Apple 
    mixerDescription.componentFlags = 0 
    mixerDescription.componentFlagsMask = 0 

    AUGraphAddNode(graph, &mixerDescription, &audioEffectsController.mixerNode) 
    AUGraphNodeInfo(graph, audioEffectsController.mixerNode, nil, 
        &audioEffectsController.mixerUnit) 
    AudioUnitInitialize(audioEffectsController.mixerUnit!) 

    AudioUnitSetParameter(mixerUnit!, kMultiChannelMixerParam_Volume, kAudioUnitScope_Input, 0, 1.0, 0); 
    AudioUnitSetParameter(mixerUnit!, kMultiChannelMixerParam_Volume, kAudioUnitScope_Output, 0, 1.0, 0); 


    //connect the nodes 
    AUGraphConnectNodeInput(graph, sourceNode, sourceOutputBusNumber, filterNode, 0) 
    AUGraphConnectNodeInput(graph, filterNode, sourceOutputBusNumber, dynamicProcessorNode, 0) 

    AUGraphConnectNodeInput(graph, sourceNodeCopy, sourceOutputBusNumber, mixerNode, 0) 
    AUGraphConnectNodeInput(graph, fiterNode, sourceOutputBusNumber, mixerNode, 0) 

    //connect the mixer to the output 
    AUGraphConnectNodeInput(graph, audioEffectsController.mixerNode, 0, destinationNode, destinationInputBusNumber) 

Answer 1

（0）のMixerNode。しかし、一つだけではなく

AUGraphConnectNodeInput(graph, sourceNodeCopy, sourceOutputBusNumber, mixerNode, 0) 
AUGraphConnectNodeInput(graph, fiterNode, sourceOutputBusNumber, mixerNode, 1)