On 01/10/2013 10:30 PM, shal@xxxxxxx wrote:
De: "Hans Wilmers" <hanswil@xxxxxxxxxx>
No luck with this either - fastest one I get is 48000. This
corresponds
to the output of lsusb, which does not list samplerates over 48000
for
this device.
I have tried different kernel, 3.2 to 3.7.1, vanilla or ubuntu kernel.
The lsusb does not means that you are limited to 48000.
The lsusb provides the "devices descriptor" and a devices descriptors has one or more "configuration descriptor". The kernel chooses one of the "configuration descriptor".
In your device descriptor (provided directly by the device) there is two possibles configuration descriptons (the bNumConfigurations=2). The first one corresponds to the UAC1 mode in high-speed (this is my one configuration) and so limited to 48000. The second one is the UAC2 mode (the expected mode).
Perhaps the kernel choose the fist good one, so UAC1 .
Can you send the result of cat /proc/asound/USBPre2/stream0 ?
Yes, see below.
/ Hans
--------------- /proc/asound/USBPre2/stream0 -------------
Sound Devices USBPre2 at usb-0000:00:1a.0-1.2, high speed : USB Audio
Playback:
Status: Stop
Interface 1
Altset 1
Format: S16_LE
Channels: 2
Endpoint: 6 OUT (ASYNC)
Rates: 8000, 16000, 24000, 32000, 44100, 48000
Data packet interval: 1000 us
Interface 1
Altset 2
Format: S24_3LE
Channels: 2
Endpoint: 6 OUT (ASYNC)
Rates: 8000, 16000, 24000, 32000, 44100, 48000
Data packet interval: 1000 us
Capture:
Status: Stop
Interface 2
Altset 1
Format: S16_LE
Channels: 2
Endpoint: 5 IN (ASYNC)
Rates: 8000, 16000, 24000, 32000, 44100, 48000
Data packet interval: 1000 us
Interface 2
Altset 2
Format: S24_3LE
Channels: 2
Endpoint: 5 IN (ASYNC)
Rates: 8000, 16000, 24000, 32000, 44100, 48000
Data packet interval: 1000 us
--------------------------------------------------------------
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