ios – AudioUnit“Sometime”不起作用. “只”发生在6s(可能是6s加,但我还没有测试过)

概述我正在使用AudioUnit进行播放和录制.优选设置是采样率= 48kHz,缓冲持续时间= 0.02 这是播放和录制的渲染回调： static OSStatus recordingCallback(void *inRefCon, AudioUnitRenderActionFlags *ioActionFlags, 我正在使用AudioUnit进行播放和录制.优选设置是采样率= 48kHz,缓冲持续时间= 0.02

这是播放和录制的渲染回调：

static Osstatus recordingCallback(voID *inRefCon,AudioUnitRenderActionFlags *ioActionFlags,const AudioTimeStamp *inTimeStamp,UInt32 inBusNumber,UInt32 inNumberFrames,audiobufferlist *ioData) {    IosAudioController *microphone = (__brIDge IosAudioController *)inRefCon;    // render audio into buffer    Osstatus result = AudioUnitRender(microphone.audioUnit,ioActionFlags,inTimeStamp,inBusNumber,inNumberFrames,microphone.tempBuffer);    checkStatus(result);//    kAudioUnitErr_InvalIDPropertyValue    // notify delegate of new buffer List to process    if ([microphone.dataSource respondsToSelector:@selector(microphone:hasBufferList:withBufferSize:withNumberOfChannels:)])    {        [microphone.dataSource microphone:microphone                          hasBufferList:microphone.tempBuffer                         withBufferSize:inNumberFrames                   withNumberOfChannels:microphone.destinationFormat.mChannelsPerFrame];    }    return result;}/** This callback is called when the audioUnit needs new data to play through the speakers. If you don't have any,just don't write anything in the buffers */static Osstatus playbackCallback(voID *inRefCon,audiobufferlist *ioData) {        IosAudioController *output = (__brIDge IosAudioController *)inRefCon;    //    // Try to ask the data source for audio data to fill out the output's    // buffer List    //    if( [output.dataSource respondsToSelector:@selector(outputShouldUseCircularBuffer:)] ){        TPCircularBuffer *circularBuffer = [output.dataSource outputShouldUseCircularBuffer:output];        if( !circularBuffer ){            //            SInt32 *left  = ioData->mBuffers[0].mData;            //            SInt32 *right = ioData->mBuffers[1].mData;            //            for(int i = 0; i < inNumberFrames; i++ ){            //                left[  i ] = 0.0f;            //                right[ i ] = 0.0f;            //            }            *ioActionFlags |= kAudioUnitRenderAction_OutputIsSilence;            return noErr;        };        /**         Thank you Michael Tyson (A Tasty Pixel) for writing the TPCircularBuffer,you are amazing!         */        // Get the available bytes in the circular buffer        int32_t availableBytes;        voID *buffer = TPCircularBufferTail(circularBuffer,&availableBytes);        int32_t amount = 0;        //        float floatNumber = availableBytes * 0.25 / 48;        //        float speakerNumber = ioData->mBuffers[0].mDataByteSize * 0.25 / 48;        for (int i=0; i < ioData->mNumberBuffers; i++) {            AudioBuffer abuffer = ioData->mBuffers[i];            // IDeally we'd have all the bytes to be copIEd,but compare it against the available bytes (get min)            amount = MIN(abuffer.mDataByteSize,availableBytes);            // copy buffer to audio buffer which gets played after function return            memcpy(abuffer.mData,buffer,amount);            // set data size            abuffer.mDataByteSize = amount;        }        // Consume those bytes ( this will internally push the head of the circular buffer )        TPCircularBufferConsume(circularBuffer,amount);    }    else    {        //        // Silence if there is nothing to output        //        *ioActionFlags |= kAudioUnitRenderAction_OutputIsSilence;    }    return noErr;}

_tempBuffer配置了4096帧.

以下是我取消分配audioUnit的方法.请注意,由于VoiceProcessingIO单元如果启动,停止并再次启动它可能无法正常工作的错误,我需要每次都处理并初始化它.这是一个已知的问题并发布在这里,但我不记得链接.

if (_tempBuffer != NulL) {    for(unsigned i = 0; i < _tempBuffer->mNumberBuffers; i++)    {        free(_tempBuffer->mBuffers[i].mData);    }    free(_tempBuffer);}AudioComponentInstancedispose(_audioUnit);

此配置适用于6,6及更早版本的设备.但是在6s(可能是6s)出现了问题.有些时候,(那些错误确实非常烦人.我讨厌它.对我来说,它在20次测试中发生了6-7次),仍有传入和传出的数据来自IoUnit,但根本没有声音.
它似乎永远不会发生在第一次测试,所以我猜它可能是IoUnit的内存问题,我仍然不知道如何解决这个问题.

任何建议将不胜感激.

UPDATE

我忘了展示我如何配置AudioUnit

// Describe audio component    AudioComponentDescription desc;    desc.componentType = kAudioUnitType_Output;    desc.componentSubType = kAudioUnitSubType_VoiceProcessingIO;    desc.componentFlags = 0;    desc.componentFlagsMask = 0;    desc.componentManufacturer = kAudioUnitManufacturer_Apple;    // Get component    AudioComponent inputComponent = AudioComponentFindNext(NulL,&desc);    // Get audio units    status = AudioComponentInstanceNew(inputComponent,&_audioUnit);    checkStatus(status);    // Enable IO for recording    UInt32 flag = 1;    status = AudioUnitSetProperty(_audioUnit,kAudioOutputUnitProperty_EnableIO,kAudioUnitScope_input,kinputBus,&flag,sizeof(flag));    checkStatus(status);    // Enable IO for playback    status = AudioUnitSetProperty(_audioUnit,kAudioUnitScope_Output,kOutputBus,sizeof(flag));    checkStatus(status);    // Apply format    status = AudioUnitSetProperty(_audioUnit,kAudioUnitProperty_StreamFormat,&_destinationFormat,sizeof(self.destinationFormat));    checkStatus(status);    status = AudioUnitSetProperty(_audioUnit,sizeof(self.destinationFormat));    checkStatus(status);    // Set input callback    AURenderCallbackStruct callbackStruct;    callbackStruct.inputProc = recordingCallback;    callbackStruct.inputProcRefCon = (__brIDge voID * _Nullable)(self);    status = AudioUnitSetProperty(_audioUnit,kAudioOutputUnitProperty_SetinputCallback,kAudioUnitScope_Global,&callbackStruct,sizeof(callbackStruct));    checkStatus(status);    // Set output callback    callbackStruct.inputProc = playbackCallback;    callbackStruct.inputProcRefCon = (__brIDge voID * _Nullable)(self);    status = AudioUnitSetProperty(_audioUnit,kAudioUnitProperty_SetRenderCallback,sizeof(callbackStruct));    checkStatus(status);    // disable buffer allocation for the recorder (optional - do this if we want to pass in our own)    flag = 0;    status = AudioUnitSetProperty(_audioUnit,kAudioUnitProperty_ShouldAllocateBuffer,sizeof(flag));    [self configureMicrophoneBufferList];    // Initialise    status = AudioUnitinitialize(_audioUnit);

@R_403_6120@ 3件事可能是问题：

对于静默(在下溢期间),您可能希望尝试使用0的inNumberFrames填充缓冲区,而不是未修改地返回它们.

在音频回调中,Apple DTS不推荐使用任何Objective C消息(您的respondsToSelector：call).

在音频处理确实停止之前,您不应释放缓冲区或调用AudioComponentInstancedispose.由于音频单元在另一个实时线程中运行,因此它们不会(获取线程或cpu时间)真正停止,直到您的应用程序进行停止音频呼叫后的一段时间.我会等几秒钟,当然不会在延迟时间之后调用(重新)初始化或(重新)启动.

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