choppy usb audio using mpd

Hello,

I now have music playing. It plays perfectly with mocp, but not with mpd. On mpd it is choppy and uses 100% cpu. Also, I have already tried the method recommended here
http://plugapps.com/forum/viewtopic.php?f=6&t=206&start=10

Since my card is 1, I also treid changing 0 to 1, with no success.

here is some output:
lsusb:

Bus 001 Device 008: ID 1130:1620 Tenx Technology, Inc. 
Bus 001 Device 005: ID 13fe:1f00 Kingston Technology Company Inc. DataTraveler 2.0 4GB Flash Drive / Patriot Xporter 32GB (PEF32GUSB) Flash Drive
Bus 001 Device 004: ID 152d:2338 JMicron Technology Corp. / JMicron USA Technology Corp. JM20337 Hi-Speed USB to SATA & PATA Combo Bridge
Bus 001 Device 002: ID 05e3:0608 Genesys Logic, Inc. USB-2.0 4-Port HUB
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub

/etc/mpd.conf

audio_output {
        type            "alsa"
        name            "My ALSA Device"
        device          "hw:1,0"        # optional
        format          "44100:16:2"    # optional
        mixer_device    "default"       # optional
        mixer_control   "PCM"           # optional
        mixer_index     "0"             # optional
}

cat /proc/asound/card1/pcm0p/sub0/hw_params

closed

/etc/asound.conf

pcm.!default {
        type hw
        card 1
}

ctl.!default {
        type hw
        card 1
}

Thanks, I really hope to get this working!



Edited 1 time(s). Last edit at 11/22/2010 12:15AM by truthe.

I had the same issue, I never found a solution (and I admittedly didn't try since I had another sound adapter that worked)
Reading on the different forums it seems that the "cheap" USB adapters from eBay don't work, but the ones with the CM119 chip work. I ended up ordering the SYBA USB Audio adapter (http://www.amazon.com/Syba-SD-CM-UAUD-Adapter-C-Media-Chipset/dp/B001MSS6CS), that was also recommended here:
http://mightyohm.com/blog/2008/10/building-a-wifi-radio-part-1-introduction/ and here: http://garydion.com/projects/wifiradio/

There is a whole discussion about USB Audio adapters on the MightyOhm Forum

You might find the SYBA on NewEgg as well, it came out to about $8 shipped for me.
Now the CPU usage is 4% max when playing audio from mpd using mpc, with the cheap adapter it was about 99% and choppy every second or so.
I also had another USB-Audio stick that came with a PlanTronics headset ("Plantronics DSP adapter-01") which works as well.


Hope that helps,
Mike

Which kernel do you use? Jeff's original or an updated one?

Greetings,
Thomas

Have you tried with the zoh resampler as I suggested in the other forum post? It solved the problem for me.

truehl Wrote:
-------------------------------------------------------
> Which kernel do you use? Jeff's original or an
> updated one?
>
> Greetings,
> Thomas

I am using the following kernel. I believe it's jeff's original.

Linux debian 2.6.32-5-kirkwood #1 Sun Oct 31 11:19:32 UTC 2010 armv5tel GNU/Linux

edit:

Falker, that did the trick. Thanks.



Edited 1 time(s). Last edit at 11/22/2010 12:56PM by truthe.

I guess you have it working now, but for completeness' sake, I am using Gorgone's latest kernel (2.6.35.7.4) from here.

Change the audio_output section of the /etc/mpd.conf file to :

audio_output {
        type               "alsa"
        name               "My ALSA Device"
        format             "44100:16:2"    
        period_time        "50000"
}

it should fix the problem.

Roman

had that issues too...
compiled the latest svn on the dockstar and it works great.
I think their was a general problem with the mpd version squeeze provides.