[gst-devel] Getting names and description of the "Source" devices.

Osmo Maatta osmoma at gmail.com
Mon Jul 19 09:25:03 CEST 2010


I am writing a small sound-recording application/applet in C. It will do 
approx. the same task as this command line.
$ gst-launch-0.10 pulsesrc device="xxxx" ! queue ! audioconvert ! 
vorbisenc ! oggmux ! filesink location=test.oga

My platform is GNOME on Ubuntu-Linux 10.04.

In my GTK app, I would like to fill a listbox with names and description 
of the "Source" devices; such as
"Audio card X"
"Micro phone 1"
so the user can select the source of the recording. See the devive= 
parameter in the above command line.

How can I find the device names + description using c and GStreamer 

I have poked the "gstreamer-properties" application and it finds the 
device names like

PulseAudio Audio Source (pulsesrc):
Device name: alsa_output.pci-0000_04_02.0.analog-stereo.monitor
Description: Unknown

PulseAudio Audio Source (pulsesrc):
Device name: device alsa_input.usb-046d_089d-01-U0x46d0x89d.analog-mono
Description: Unknown

The device name is ok, but the human readable description is 

See this picture:
The device description for Source #0 and #1 are set to "Unknown".

However the "pactl list" command shows the description right.
Source #0
  State: RUNNING
  Name: alsa_output.pci-0000_04_02.0.analog-stereo.monitor <-- I WANT THIS
  Description: Monitor of SB0400 Audigy2 Value Analog Stereo <--- AND THIS

Source #1
  Name: alsa_input.usb-046d_089d-01-U0x46d0x89d.analog-mono <- I WANT THIS
  Description: QuickCam E2500 series Analog Mono <--- AND THIS

Test code:
   Gstreamer newbie.
   Moma Antero M (osmo)
   www.futuredesktop.org (com)

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