ios – 录制RemoteIO和VPIO之间的音量降低切换

在我的应用程序中,我需要在这两个不同的AudioUnit之间切换.
每当我从VPIO切换到RemoteIO时,我的录音音量都会下降.相当显着下降.
尽管播放音量没有变化.有人经历过这个吗？

这是我进行切换的代码,由路由更改触发. (我不太确定我是否正确改变了,所以我也在这里问.)

如何解决录音音量下降的问题？

谢谢,感谢我能得到的任何帮助.

码头.

- (void)switchInputBoxTo : (OSTypE) inputBoxSubType
{
OSStatus result;

if (!remoteIONodE) return; // NULL check

// Get info about current output node
AudioComponentDescription outputACD;
AudioUnit currentOutputUnit;

AUGraphNodeInfo(theGraph,remoteIONode,&outputACD,&currentOutputUnit);

if (outputACD.componentSubType != inputBoxSubTypE)
{
    AUGraphStop(theGraph);
    AUGraphUninitialize(theGraph); 
    result = AUGraphDisconnectNodeInput(theGraph,0);
    NSCassert (result == noErr,@"Unable to disconnect the nodes in the audio processing graph. Error code: %d '%.4s'",(int) result,(const char *)&result);
    AUGraphRemoveNode(theGraph,remoteIONodE);
    // Re-init as other type

    outputACD.componentSubType = inputBoxSubType;
    // Add the RemoteIO unit node to the graph
    result = AUGraphAddNode (theGraph,&remoteIONodE);
    NSCassert (result == noErr,@"Unable to add the replacement IO unit to the audio processing graph. Error code: %d '%.4s'",(const char *)&result);

    result = AUGraphConnectNodeInput(theGraph,mixerNode,0);
    // Obtain a reference to the I/O unit from its node
    result = AUGraphNodeInfo (theGraph,&_remoteIoUnit);
    NSCassert (result == noErr,@"Unable to obtain a reference to the I/O unit. Error code: %d '%.4s'",(const char *)&result);

    //result = AudioUnitUninitialize(_remoteIoUnit);

    [self setupRemoteIOTest]; // reinit all that remoteIO/voiceProcessing stuff
    [self configureAndStartAudioProcessingGraph:theGraph];
}  
}