如何将效果应用于麦克风输入?(iOS Core Audio& Audio Graph) [英] How do I apply effect to mic input?(iOS Core Audio & Audio Graph)
问题描述
我想在iOS5上开发应用程序以获得语音和应用效果(高通过滤器,延迟等)并从扬声器输出。
I would like to develop application on iOS5 that get voice and apply effect(high pass filer, delay, and so on) to it and output it from speaker.
我尝试了RemoteIO(输入) - >效果 - > RemoteIO(输出)
但它没有用。
I tried RemoteIO(input) -> effect ->RemoteIO(output) but it didn't work.
AudioComponentDescription cd;
cd.componentType = kAudioUnitType_Output;
cd.componentSubType = kAudioUnitSubType_RemoteIO;
cd.componentManufacturer = kAudioUnitManufacturer_Apple;
cd.componentFlags = 0;
cd.componentFlagsMask = 0;
AUGraphAddNode(self.auGraph, &cd, &remoteIONode);
AUGraphNodeInfo(self.auGraph, remoteIONode, NULL, &remoteIOUnit);
UInt32 flag = 1;
AudioUnitSetProperty(remoteIOUnit, kAudioOutputUnitProperty_EnableIO, kAudioUnitScope_Input, 1, &flag, sizeof(flag));
AudioStreamBasicDescription audioFormat = [self auCanonicalASBDSampleRate:44100.0 channel:1];
AudioUnitSetProperty(remoteIOUnit, kAudioUnitProperty_StreamFormat, kAudioUnitScope_Output, 1, &audioFormat, sizeof(AudioStreamBasicDescription));
AudioUnitSetProperty(remoteIOUnit, kAudioUnitProperty_StreamFormat, kAudioUnitScope_Input, 0, &audioFormat, sizeof(AudioStreamBasicDescription));
AudioComponentDescription cd_e;
cd_e.componentSubType = kAudioUnitSubType_LowPassFilter;
cd_e.componentSubType = kAudioUnitSubType_Reverb2;
cd_e.componentFlags = 0;
cd_e.componentFlagsMask = 0;
cd_e.componentManufacturer = kAudioUnitManufacturer_Apple;
AUGraphAddNode(self.auGraph, &cd_e, &effectNode);
AUGraphNodeInfo(self.auGraph, effectNode, NULL, &effectUnit);
AudioUnitSetProperty(effectUnit, kAudioUnitProperty_StreamFormat, kAudioUnitScope_Global, 0, &audioFormat, sizeof(AudioStreamBasicDescription));
AudioUnitSetParameter(effectUnit, kAudioUnitScope_Global, 0, kLowPassParam_CutoffFrequency, 10.f, 0);
AudioUnitSetParameter(effectUnit, kAudioUnitScope_Global, 0, kLowPassParam_Resonance, 10, 0);
AUGraphConnectNodeInput(self.auGraph, remoteIONode, 1, effectNode, 0);
AUGraphConnectNodeInput(self.auGraph, effectNode, 0, remoteIONode, 0);
AUGraphInitialize(localGraph);
但如果AUGraphConnectNodeInput设置如下,我听到了发言者的声音。
But if AUGraphConnectNodeInput set bellow , I heard my voice from speaker.
AUGraphConnectNodeInput(self.auGraph, remoteIONode, 1, remoteIONode, 0);
我该怎么做?
推荐答案
我写了教程详细介绍了如何从iOS上的麦克风进行实时处理和录制,但从那时起,我发现了 novocaine ,这是在iOS上进行效果处理的很多更简单的方式。这比处理AURemoteGraph和那些东西容易得多。
I wrote a tutorial detailing how to do realtime processing and recording from the microphone on iOS, but since then, I have discovered the joys of novocaine, which is a much easier way of doing effect processing on iOS. This is much easier than dealing with AURemoteGraph and that stuff.
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