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Bluetooth one way audio with iPhone OS 3.1

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Bluetooth one way audio with iPhone OS 3.1

Subject: Bluetooth one way audio with iPhone OS 3.1
From: Langtian Du <email@hidden>
Date: Tue, 27 Oct 2009 10:53:00 -0700 (PDT)

I have play_and_record audio session, it works well with build in speaker & microphone.

I enabled kAudioSessionProperty_OverrideCategoryEnableBluetoothInput to support

bluetooth audio.

If I start the audio session (audioqueue) with kAudioSessionProperty_OverrideCategoryEnableBluetoothInput

enabled directly, it also works on both bluetooth input and bluetooth output.

However, if during the session, I enable the audio route to speaker for a few seconds (either with

kAudioSessionProperty_OverrideCategoryEnableBluetoothInput enabled or not), then I disable the

route to speaker, set kAudioSessionProperty_OverrideCategoryEnableBluetoothInput again, I

only get bluetooth input/MIC, but I can't hear anything on the bluetooth speaker. I checked the audio

queue, which is working. (It has the interrupt yo get data)

I verified all the audio hardware information, like route is Bluetooth, sample rate is 8000, category is play-and_recorder,

actually they all same as the previous working one.

Any one see this issue? Is this a iPhone OS bug? Or where is my problem?

Thanks,

Langtian

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