[pulseaudio-discuss] M-Audio FastTrack Pro
davidk at lysator.liu.se
Thu Jan 7 07:52:37 PST 2010
Lennart Poettering <lennart at poettering.net> writes:
> On Thu, 07.01.10 15:08, David Kågedal (davidk at lysator.liu.se) wrote:
>> Lennart Poettering <lennart at poettering.net> writes:
>> >> And another thing: The sinks appear as "FastTrack_Pro ...", with an
>> >> underscore instead of a space for some reason.
>> > That's data read from the USB device itself. PA uses that only if no
>> > prettier device string is available in the usb.ids database (which is
>> > the same one that is used by lsusb).
>> But that is the strange part. There is no underscore in any ALSA output
>> I found. This is from /proc/asound/cards, for instance:
> ALSA includes its own string database in the drivers. On most devices
> ALSA usually uses only a string like "USB Audio" which is why we use
> that as last resort only, if the USB descriptor does not include s
>> 1 [Pro ]: USB-Audio - FastTrack Pro
>> M-Audio FastTrack Pro at usb-0000:00:1d.7-4.4, full speed
>> It has USB ID 0763:2012, but I don't even see it listed in
> Yes, that's precisely the reason why PA falls back to that string that
> is read from the USB device itself: if there was an entry in the db it
> would take precedence. That's why I asked you to submit an entry with
> a pretty string.
But the string read from the USB device itself has no underscore, as far
as I can tell.
>> In /proc/asound/card1/id it is simply described as "Pro".
> Yes, that is just a logical string that is used do situingish it from
> the other cards in the system, it is a string similar to how network
> interfaces are called "eth0" or "wlan0".
> Here's the order how we look for a name:
> 1) use the usb.ids name if there is one in the db
> 2) use the usb device string read from the device itself is there is
> 3) fallback to the descriptive name alsa uses for it which often
> enough is very generic, such as "USB Audio".
> And I asked you to add a pretty string to usb.ids and submit that to
> the official database so that everyone can enjoy a nicer string.
Sure, I will do that. But I'm still not sure I understand why we aren't
using then perfectly good name "M-Audio FastTrack Pro" that apparently
is reported by ALSA in /proc/asound/cards.
In 2) in your list, are you saying that PA reads "FastTrack_Pro" from
somewhere? lsusb -v also lists the name without underscore.
Here is part of the output from "pacmd list":
alsa.resolution_bits = "16"
device.api = "alsa"
device.class = "sound"
alsa.class = "generic"
alsa.subclass = "generic-mix"
alsa.name = "USB Audio"
alsa.id = "USB Audio"
alsa.subdevice = "0"
alsa.subdevice_name = "subdevice #0"
alsa.device = "0"
alsa.card = "1"
alsa.card_name = "FastTrack Pro"
alsa.long_card_name = "M-Audio FastTrack Pro at usb-0000:00:1d.7-4.4, full speed"
alsa.driver_name = "snd_usb_audio"
device.bus_path = "pci-0000:00:1d.7-usb-0:4.4:1.0"
sysfs.path = "/devices/pci0000:00/0000:00:1d.7/usb2/2-4/2-4.4/2-4.4:1.0/sound/card1"
udev.id = "usb-M-Audio_FastTrack_Pro-00"
device.bus = "usb"
device.vendor.id = "0763"
device.vendor.name = "Midiman"
device.product.id = "2012"
device.product.name = "FastTrack_Pro"
device.serial = "M-Audio_FastTrack_Pro"
device.string = "hw:1,0,0"
device.buffering.buffer_size = "352800"
device.buffering.fragment_size = "176400"
device.access_mode = "mmap+timer"
device.profile.name = "analog-stereo-a-output"
device.profile.description = "Analog Stereo Channel A"
device.description = "FastTrack_Pro Analog Stereo Channel A"
alsa.mixer_name = "USB Mixer"
alsa.components = "USB0763:2012"
module-udev-detect.discovered = "1"
device.icon_name = "audio-card-usb"
What shows up in pavucontrol is device.description, as far as I can
tell. How is that formed? Does it use device.product.name?
I tried digging through the sources, but I didn't really manage to get
to the source of it.
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