Re: Google TV device w/ AV out

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

On 07/01/2013 05:16 PM, Patrick Shirkey wrote:
> 
> On Tue, July 2, 2013 12:44 am, Jeremy Jongepier wrote:
>> On 07/01/2013 04:12 PM, Patrick Shirkey wrote:
>>> IIUC the potential issues with period sizes with non powers of
>>> two are at the application level. JACK is agnostic about it.
>>> 
>> 
>> Yes, guitarix for instance doesn't like period sizes that are not
>> a power of two.
>> 
>>> Anyway it's a little spooky that you get better performance
>>> with -p64 than -p128 even in playback only mode.
>> 
>> Well I'm testing and haven't done any real stress-tests yet.
>> Maybe it was a one-off. At least I get undistorted sound out of
>> this device. Now if I could only figure out why JACK bails out
>> every once so often.
> 
> Does this happen with or without wifi enabled?
> 
>> And why full-duplex doesn't work, well, it works but the audio
>> coming out is distorted.
>> 
> 
> System load causing distortion on the Audio device in duplex mode.
> It suggests something is wrong with the bus and or interrupts but I
> don't see why it would be ok in playback only mode. Not sure if it
> is related but I have noticed that my old usb quattro often takes a
> while to warm up. Sometimes I have to run it for a few hours and
> start/stop jack several times to get undistorted output.
> 
> Another issue is the Rockchip devs probably haven't tested the
> device at low latency with duplex mode so they haven't picked up
> that issue. We can try flagging it with them.
> 
> I forgot what the audio chipset is. Can you post the output of cat 
> /proc/asound/cards?
> 

jeremy@rk3066:~$ cat /proc/asound/cards
 0 [RK29RK1000     ]: RK29_RK1000 - RK29_RK1000
                      RK29_RK1000
 1 [HDMI           ]: ROCKCHIP_HDMI - ROCKCHIP HDMI
                      ROCKCHIP HDMI
 2 [Device         ]: USB-Audio - Generic USB Audio Device
                      Generic USB Audio Device at usb-usb20_host-1.1,
full speed

'Device' is a $2 USB audio interface with a C-Media chipset. But I got
one step further:

jeremy@rk3066:~$ uname -a
Linux rk3066 3.0.36-rt58 #1 SMP PREEMPT RT Thu Jul 4 13:18:23 CEST
2013 armv7l GNU/Linux

So I've got a RT kernel running on it. Moving on :)

Jeremy

> 
> 
> 
> -- Patrick Shirkey Boost Hardware Ltd 
> _______________________________________________ Linux-audio-user
> mailing list Linux-audio-user@xxxxxxxxxxxxxxxxxxxx 
> http://lists.linuxaudio.org/listinfo/linux-audio-user
> 

-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.4.11 (GNU/Linux)
Comment: Using GnuPG with undefined - http://www.enigmail.net/
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=iTTB
-----END PGP SIGNATURE-----
_______________________________________________
Linux-audio-user mailing list
Linux-audio-user@xxxxxxxxxxxxxxxxxxxx
http://lists.linuxaudio.org/listinfo/linux-audio-user




[Index of Archives]     [Linux Sound]     [ALSA Users]     [Pulse Audio]     [ALSA Devel]     [Sox Users]     [Linux Media]     [Kernel]     [Photo Sharing]     [Gimp]     [Yosemite News]     [Linux Media]

  Powered by Linux