[mythtv-users] v4l Drivers

[Greg Oliver]

On Wed, Oct 20, 2010 at 12:20 PM, mike at grounded.net <mike at grounded.net> wrote:
>> aplay -l will show you what devices you have that alsa is recognizing.
>> aplay -L will give you a more deined view I think (not in front of my
>> setup), and you should be able to make an educated decision.  The list
>> of entries that show up in that menu *are not* necessarily cards in
>> your system.  You may have to type the entry in manually to get it to
>> work.
>
> I would try to make an educated guess but I don't see anything that makes sense to me :).
> I did go ahead and try many if not all of the options shown in the audio section of the front end and no audio yet.
> In the desktop, I also made sure that the Sound section is using the right (and only) audio device along with muting input.
>
> Looking at dmesg;
>
> usb 3-2: configuration #1 chosen from 1 choice
> input: USB Audio as /devices/pci0000:00/0000:00:1d.1/usb3/3-2/3-2:1.3/input/input4
> generic-usb 0003:0D8C:0006.0001: input,hidraw0: USB HID v1.00 Device [USB Audio] on usb-0000:00:1d.1-2/input3
> usbcore: registered new interface driver snd-usb-audio
> usbcore: registered new interface driver dvb_usb_dib0700
>
> This tells me that the device is /devices/pci0000:00/0000:00:1d.1/usb3/3-2/3-2:1.3/input/input4
> I've never seen a device named like this, usually, they are /dev/video0, something along those lines but with /dev/ at the start.
>
> Looking at aplay;
>
> # aplay -l
> **** List of PLAYBACK Hardware Devices ****
> card 0: Audio [USB Audio], device 0: USB Audio [USB Audio]
>  Subdevices: 1/1
>  Subdevice #0: subdevice #0
>
> # aplay -L
> default
>    Default
> front:CARD=Audio,DEV=0
>    USB Audio, USB Audio
>    Front speakers
> surround40:CARD=Audio,DEV=0
>    USB Audio, USB Audio
>    4.0 Surround output to Front and Rear speakers
> surround41:CARD=Audio,DEV=0
>    USB Audio, USB Audio
>    4.1 Surround output to Front, Rear and Subwoofer speakers
> surround50:CARD=Audio,DEV=0
>    USB Audio, USB Audio
>    5.0 Surround output to Front, Center and Rear speakers
> surround51:CARD=Audio,DEV=0
>    USB Audio, USB Audio
>    5.1 Surround output to Front, Center, Rear and Subwoofer speakers
> surround71:CARD=Audio,DEV=0
>    USB Audio, USB Audio
>    7.1 Surround output to Front, Center, Side, Rear and Woofer speakers
> iec958:CARD=Audio,DEV=0
>    USB Audio, USB Audio
>    IEC958 (S/PDIF) Digital Audio Output
>
> I have my output connected to Front Out on the device so that seems to be the
> front:CARD=Audio,DEV=0
>    USB Audio, USB Audio
>    Front speakers
>
> ...section of this output.

aplay -l as well, and we can probably cook something up.  If you have
`alsamixer` installed, run it in a terminal and see what it says for
the default card as well.