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我正在尝试编写一个可以添加声音效果的iOS应用.我试图在auconverter和remoteIO之间放置一个效果音频单元(例如,失真和混响).设置完AU后,没有声音.

    NewAUGraph(&mAuGraph);
    AUGraphOpen(mAuGraph);

    AUNode remoteOutputNode, converterNode, effectNode;
    AudioUnit remoteIOAudioUnit, converterUnit, effectUnit;

    AudioComponentDescription cd;

    cd.componentManufacturer = kAudioUnitManufacturer_Apple;
    cd.componentFlags = cd.componentFlagsMask = 0;

    // remote io
    cd.componentType = kAudioUnitType_Output;
    cd.componentSubType = kAudioUnitSubType_RemoteIO;
    AUGraphAddNode(mAuGraph, &cd, &remoteOutputNode);

    // converter
    cd.componentType = kAudioUnitType_FormatConverter;
    cd.componentSubType = kAudioUnitSubType_AUConverter;
    AUGraphAddNode(mAuGraph, &cd, &converterNode);

    // ipodeq
    cd.componentType = kAudioUnitType_Effect;
    cd.componentSubType = kAudioUnitSubType_Distortion;
    AUGraphAddNode(mAuGraph, &cd, &effectNode);

    //callback
    AURenderCallbackStruct callbackStruct;
    callbackStruct.inputProc = renderCallback;
    callbackStruct.inputProcRefCon = &audioDataInfo;
    AUGraphSetNodeInputCallback(mAuGraph, converterNode, 0, &callbackStruct);

    // set audio unit asbd
    AudioStreamBasicDescription audioFormat = AUCanonicalASBD(44100.0, audioDataInfo.inputFormat.mChannelsPerFrame);
    AUGraphNodeInfo(mAuGraph, converterNode, …