Iphone 如何在apple aurio Touch（例如音频会话）应用程序中静音输出？

我已经根据苹果公司的 示例应用程序。但我不知道如何设置音频单元或音频 会话不播放音频输入的声音。现在在麦克风里吹的时候， 我能听到iphone扬声器的呼吸声。如何预防

以下是苹果的音频会话初始化代码：

            XThrowIfError(AudioSessionInitialize(NULL, NULL, rioInterruptionListener, self), "couldn't initialize audio session");
        XThrowIfError(AudioSessionSetActive(true), "couldn't set audio session active\n");


        UInt32 audioCategory = kAudioSessionCategory_RecordAudio;
        XThrowIfError(AudioSessionSetProperty(kAudioSessionProperty_AudioCategory, sizeof(audioCategory), &audioCategory), "couldn't set audio category");
        XThrowIfError(AudioSessionAddPropertyListener(kAudioSessionProperty_AudioRouteChange, propListener, self), "couldn't set property listener");

        Float32 preferredBufferSize = .005;
        XThrowIfError(AudioSessionSetProperty(kAudioSessionProperty_PreferredHardwareIOBufferDuration, sizeof(preferredBufferSize), &preferredBufferSize), "couldn't set i/o buffer duration");

        UInt32 size = sizeof(hwSampleRate);
        XThrowIfError(AudioSessionGetProperty(kAudioSessionProperty_CurrentHardwareSampleRate, &size, &hwSampleRate), "couldn't get hw sample rate");

        XThrowIfError(SetupRemoteIO(rioUnit, inputProc, thruFormat), "couldn't setup remote i/o unit");

        dcFilter = new DCRejectionFilter[thruFormat.NumberChannels()];

        UInt32 maxFPS;
        size = sizeof(maxFPS);
        XThrowIfError(AudioUnitGetProperty(rioUnit, kAudioUnitProperty_MaximumFramesPerSlice, kAudioUnitScope_Global, 0, &maxFPS, &size), "couldn't get the remote I/O unit's max frames per slice");

        fftBufferManager = new FFTBufferManager(maxFPS);
        l_fftData = new int32_t[maxFPS/2];



        XThrowIfError(AudioOutputUnitStart(rioUnit), "couldn't start remote i/o unit");

        size = sizeof(thruFormat);
        XThrowIfError(AudioUnitGetProperty(rioUnit, kAudioUnitProperty_StreamFormat, kAudioUnitScope_Output, 1, &thruFormat, &size), "couldn't get the remote I/O unit's output client format");

多谢 他的回答是： AURIOTouch使用单个回调将音频从输入传递到输出。所以最简单的事情就是零 在完成呼吸检测后，取出ioData结构

比如：

for (UInt32 i=0; i < inData->mNumberBuffers; i++)
memset(inData->mBuffers[i].mData, 0, inData->mBuffers[i].mDataByteSize);

（UInt32 i=0；imNumberBuffers；i++）的

memset（inData->mBuffers[i].mData，0，inData->mBuffers[i].mDataByteSize）；

---

或者您可以看看CAPlayThrough示例，该示例对输入和输出有单独的回调。

@DesprateLearner请查看我自己的答案。对我来说很有效。所以我假设你调用了：void silenedata（AudioBufferList*inData）{for（UInt32 I=0；ImNumberBuffers；I++）memset（inData->mBuffers[I].mData，0，inData->mBuffers[I].mDataByteSize）；}还有一件事。是否可以使用Aurio touch概念测量风速？