[alsa-devel] Need expert's advice - Fast Track Ultra (8R) dropping samples

[Felix Homann]

Am 05.10.2010 09:21, schrieb Clemens Ladisch:
> Felix Homann wrote:
>    
>>
>> Trying to log the value of f reveals that retire_playback_sync_urb()
>> doesn't seem to be called at all.
>>      
> The entire function or that part of the code?
>
>    

The entire function. I had placed a printk at the very beginning of 
retire_playback_sync_urb() whose output doesn't show up.

> Anyway, please try the patch below, which makes the driver
> autodetect the feedback format.  (The actual format can be
> seen in /proc/asound/cardX/stream0 while running.)
>
> Alex, please test this with your widget.
>
>    

Here's what I get:


:~$ cat /proc/asound/card2/stream0
M-Audio Fast Track Ultra 8R at usb-0000:00:1a.7-4, high speed : USB Audio

Playback:
   Status: Running
     Interface = 1
     Altset = 1
     URBs = 3 [ 57 57 57 ]
     Packet Size = 312
     Momentary freq = 48000 Hz (0x6.0000)
   Interface 1
     Altset 1
     Format: S24_3LE
     Channels: 8
     Endpoint: 1 OUT (ADAPTIVE)
     Rates: 44100, 48000, 88200, 96000
     Data packet interval: 125 us

Capture:
   Status: Running
     Interface = 2
     Altset = 1
     URBs = 8 [ 8 8 8 8 8 8 8 8 ]
     Packet Size = 312
     Momentary freq = 48000 Hz (0x6.0000)
   Interface 2
     Altset 1
     Format: S24_3LE
     Channels: 8
     Endpoint: 1 IN (ASYNC)
     Rates: 44100, 48000, 88200, 96000
     Data packet interval: 125 us



Does it tell us anything?

Kind regards,

Felix