Ios 使用音频单元播放音频流，出现爆裂声

在iOS应用程序中，

播放来自BLE的音频流，使用TPCircularBuffer和Audio Unit.

声音播放良好，但当缓冲区为空且没有字节可播放时，它会导致实例中的爆裂声.

这是我的音频流配置，

  AudioStreamBasicDescription audioFormat;
        audioFormat.mSampleRate         = 8000.00;
        audioFormat.mFormatID           = kAudioFormatLinearPCM;
        audioFormat.mFormatFlags        = kAudioFormatFlagsNativeFloatPacked | kAudioFormatFlagIsPacked;
        // || kAudioFormatFlagsNativeFloatPacked || kAudioFormatFlagIsSignedInteger
        //kAudioFormatFlagIsSignedInteger
        audioFormat.mFramesPerPacket    = 1;
        audioFormat.mChannelsPerFrame   = 1;
        audioFormat.mBitsPerChannel     = 32;// Update when required
        audioFormat.mBytesPerPacket     = 4; // Update when required
        audioFormat.mBytesPerFrame      = 4; // Update when required
    

Below is a Playback function of Audio Unit

static OSStatus playbackCallback(void *inRefCon, 
                                 AudioUnitRenderActionFlags *ioActionFlags, 
                             const AudioTimeStamp *inTimeStamp, 
                             UInt32 inBusNumber, 
                             UInt32 inNumberFrames, 
                             AudioBufferList *ioData) {

//1
for (int i=0; i < ioData->mNumberBuffers; i++) { 

    IosAudioController *THIS = (__bridge IosAudioController *)inRefCon;

    int bytesAskingByPlayback = ioData->mBuffers[i].mDataByteSize;

    SInt16 *targetBuffer = (SInt16*)ioData->mBuffers[i].mData;

    // Pull audio from playthrough buffer
    int32_t availableBytesFromBuffer;

    SInt16 *sBuffer = TPCircularBufferTail(iosAudio.addressOfTPBuffer, &availableBytesFromBuffer);
    
    int willRemainBytes = availableBytesFromBuffer - bytesAskingByPlayback;

    if (willRemainBytes > 0) {
        memcpy(targetBuffer, sBuffer, bytesAskingByPlayback);
        TPCircularBufferConsume(iosAudio.addressOfTPBuffer,bytesAskingByPlayback);
        } else {


        //Note: Mostly need to update code here

                memcpy(targetBuffer, sBuffer, availableBytesFromBuffer);

            TPCircularBufferConsume(iosAudio.addressOfTPBuffer, availableBytesFromBuffer);

    }
}
    return noErr;
}

缓冲区大小为16384

一些解决方案说我会用0填充目标缓冲区以静音，但它不工作.

Some Solution说我可以用以前的值填充目标缓冲区来填补空白.