core-audio - Core Audio：以 .wav 格式录制无法正常工作

Question

我AudioFileWritePackets()用来写数据，在录制过程中它没有返回错误。我使用的数据格式标志是：

if(appDelegate.screenRecording){
    cPacket = 0;inNumPackets = inCompleteAQBuffer->mPacketDescriptionCount;
    if (AudioFileWritePackets(nAudioFile, false, numBytes, mPacketDescs, mPacketIndex, &nPackets, inCompleteAQBuffer->mAudioData) == noErr) 
    {
        mPacketIndex += nPackets;   
        NSLog(@"sample result");            
    }
    else {
        NSLog(@"ext err");  
    }

}

每次打电话Nslog(ext err); 请帮我解决这个问题。