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Re: Drop in volume switching from VPIO to RemoteIO

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Re: Drop in volume switching from VPIO to RemoteIO

Subject: Re: Drop in volume switching from VPIO to RemoteIO
From: Pier <email@hidden>
Date: Fri, 14 Dec 2012 19:46:35 +0800

Anyone? I'm still rather stuck with this :/

On Mon, Dec 10, 2012 at 8:47 PM, Pier <email@hidden> wrote:

Hi there,

In my app I need to switch between these 2 different AudioUnits.
Whenever I switch from VPIO to RemoteIO, there is a drop in my recording volume.  Quite a significant drop.

No change in the playback volume though.Anyone experienced this?

Here's the code where I do the switch, which is triggered by a routing change. (I'm not too sure whether I did the change correctly, so am consulting you guys here)

Thanks.

Pier.

- (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, remoteIONode, 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, &outputACD, &remoteIONode);

NSCAssert (result == noErr, @"Unable to add the replacement IO unit to the audio processing graph. Error code: %d '%.4s'", (int) result, (const char *)&result);



result = AUGraphConnectNodeInput(theGraph, mixerNode, 0, remoteIONode, 0);

  // Obtain a reference to the I/O unit from its node

result = AUGraphNodeInfo (theGraph, remoteIONode, 0, &_remoteIOUnit);

NSCAssert (result == noErr, @"Unable to obtain a reference to the I/O unit. Error code: %d '%.4s'", (int) result, (const char *)&result);



//result = AudioUnitUninitialize(_remoteIOUnit);



[self setupRemoteIOTest]; // reinit all that remoteIO/voiceProcessing stuff

[self configureAndStartAudioProcessingGraph:theGraph];

}

}

--
Pier.

--
Pier.

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	>Drop in volume switching from VPIO to RemoteIO (From: Pier <email@hidden>)

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