Hi folks!

MorphOS 2.7 on Mac Mini G4 says the following when connection my Logitech USB Headset:

0-hub.class: New device 'Logitech USB Headset' at port 1. Very nice.
0-usbaudio.class: Terminal 0C (1 delay) of Format signed PCM
0-usbaudio.class: Found mode with 2 channel(s) (2 byte(s) per frame) and 16 bits
0-usbaudio.class: Terminal 0C (1 delay) of Format signed PCM
0-usbaudio.class: Found mode with 1 channel(s) (2 byte(s) per frame) and 16 bits
0-usbaudio.class: Terminal 0A (0 delay) of Format signed PCM
0-usbaudio.class: Found mode with 1 channel(s) (2 byte(s) per frame) and 16 bits
0-usbaudio.class: Play it again, 'Logitech USB Headset'!
0-hid.class: Using HID Descriptor from initial configuration run.
0-hid.class: HID the road, 'Logitech USB Headset'!

when starting e.g. AmiNetRadio to play an audio stream, the log is completed with the following messages:

20-poseidon.library: Your HW controller driver does not support realtime iso transfers. Sorry.
20-usbaudio.class: Could not allocate RT Iso Handler!

No audio playback via the headset. Is there anything that can be done about this?

Regards
Ruediger

The MorphOS USB driver doesn't support isochronous transfer, which is needed for USBAudio, AFAIK.

O.k., that's what the error message says. :) Thought the problem might be known and a solution in reach.

Are there any USB Headsets that work with the usbaudio.class?

Regards
Ruediger

The problem isn't with usbaudio.device which may as well support the headset, but with pciusb.device (the actual usb hw driver) which doesn't support isosynchronous transfers which are required for streaming audio/video via usb.

There are currently no plans to implement isosynchronous transfers in pciusb.device.

Thanks for the explanation!

Regards
Ruediger