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kIOAudioDeviceTransportTypeUSB has strange effects

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kIOAudioDeviceTransportTypeUSB has strange effects

Subject: kIOAudioDeviceTransportTypeUSB has strange effects
From: Fabian Renn <email@hidden>
Date: Wed, 27 Jul 2005 16:50:48 +0200

Hello list members,

i'm writing an audio driver for a usb high speed device ( See mail 'SPDIF audio in DVD Player' Vol 2 Issue 220 ). My device supports up to 8 channels in/out at 96 kHz 32 bit. Yet when i set my transport type to kIOAudioDeviceTransportTypeUSB my audio 'clicks' at a sample rate of 44.1 kHz. It doesn't click if i don't set the transport type or if i set it to 'kIOAudioDeviceTransportTypeOther'. Now, what could this be ( took me ages to find out that the clicking game from setDeviceTransportType )? What exactly does kIOAudioDeviceTransportTypeUSB change in handling of my device?

Greetings from Germany

Fabian Renn
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