820397 - Audio device list on Linux is crazy-long

Status: VERIFIED WORKSFORME

(Core :: WebRTC: Audio/Video, defect)

Description

[(not currently active) Ted Mielczarek]

Attachment: too many choices

There has to be something wrong with the audio device enumeration code on Linux, because we get a ridiculously long list of devices to choose from when you request an audio device (see attached screenshot).

Even if you leave out the Loopback devices (which I manually added by installing the alsa-loop kernel module) there are 14 devices listed for my onboard Intel audio (and a few of them look like output devices, so something is really wrong here).

Comment 1

[(not currently active) Ted Mielczarek]

Attachment: output of `arecord -L`

This might be broken at the platform level, ALSA seems to return this huge list. We might have to filter down the results ourselves.

Comment 2

[Ralph Giles (:rillian)]

This looks like pulse-audio's enumeration of all of output configurations for each device. The Internet suggests the code implementing 'aplay -L' may be helpful in sorting out which is which.

In any case, it appears that every application has to write its own enumeration filtering heuristics. :(

Comment 3

[Ralph Giles (:rillian)]

That is, filter by device role; look for 'front' and 'sysdefault' for audio input options. 

See https://github.com/xbmc/xbmc/blob/master/xbmc/cores/AudioEngine/Sinks/AESinkALSA.cpp#L679 for an output example.

Comment 4

[Randell Jesup [:jesup] (needinfo me)]

This appears to be fixed (by 3.43?) in both Aurora/28 and 29.  The list is small on my Fedora 19 system and comes up almost instantly now.

Comment 5

[(not currently active) Ted Mielczarek]

Yeah this looks sane now.

Comment 6

[svbabukumar]

[bugday-20140122] - Works fine in the Nightly build - 29.0a1 (2014-01-22) - Win7 - 64

Comment 7

[u279076]

svbabukumar, can you please verify this is fixed on Aurora as well?

Comment 8

[svbabukumar]

Works fine in Aurora and Beta 27 as well