When a device is switched to a non-mixable format, the HAL also
enforces hog mode (aka exclusive access to the device) in a first
come, first served way. So, what is likely going on here is that some
other process has acquired hog mode before the DVD Player can. This
leaves the DVD Player to fall back to non-encoded output on the
HALLab can tell you which process owns hog mode for your device.
Plus, it can do so without forcing the HAL to grab hog mode provided
you don't do any IO with the device in HALLab.
On Jul 23, 2005, at 12:28 PM, Fabian Renn wrote:
Dear list members,
i'm programming an audio driver for an external usb 2.0 device. The
device has a spdif connecter and i'd like dvd player to support it.
I added the audio format kIOAudioStreamSampleFormat1937AC3 to the
list of supported formats and i can select in the DVD player, yet
when i play a dvd it gives me the error message: 'digital audio
device no longer available switching to standard output!'. What
else do i need to implement that the dvd player will use my device
correctly? All other audio works fine.
Greetings from Germany
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