#1045: USB isochronous streams
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Reporter: wkornewald | Owner: nobody
Type: enhancement | Status: assigned
Priority: normal | Milestone: R1
Component: Drivers/USB | Version: R1/pre-alpha1
Resolution: | Keywords:
Blocked By: | Blocking: 10521, 11256
Platform: All |
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Comment (by rudolfc):
Hi waddlesplash, I'm curious if you own usb2.0 external audiocards? I've
got two over here which I use to make music via Jamulus. These are both
2.0 spec, and do not work yet with usb_audio.
Maybe most notably on the samplerate stuff since you now use clock sources
with multipliers and divs to set the rate somehow, I don't understand that
yet.
I am tweaking a bit with that driver to see if I can get sound out of one
of those, but it turns out probably a bit serious work has to be done for
the 2.0 spec. Testing on EHCI upto now, and indeed I just stumbled upon
the double locking panic (though outbound transfer I just saw are not yet
supported on EHCI)
Using a behringer U-phoria UMC202HD (costs around 65 euro's, german brand,
quite good actually) I get input sliders after tweaking the driver, and
also output buffers are generated and tried to exchange (which results in
the panic).
Using a Focusrite Scarlet 2i2 third gen, the inputs are still missing, but
outputs behaves the same it seems. This card costs around 200 euro's, neat
looking, works good, but has a tad more latency than the very quick
behringer..
Would you have any plans to do some more work on usb_audio?
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Ticket URL: <https://dev.haiku-os.org/ticket/1045#comment:26>
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