Getting default audio source and sink (devices) in the GNOME-desktop.

[Osmo Antero Maatta <osmoma gmail com>]

Hello,

How can I read the default values for audio-sink and audio-source in 
Linux/GNOME-desktop.

These values (device names) are set in the GNOME's gnome-volume-control 
program. Start
$ gnome-volume-control
Picture: http://bildr.no/view/796255 showing both [Input] and [Output] 
pages.

The values are stored in user's $HOME/.pulse/ directory.

$ ls  ~/.pulse/
b3b6877727df4f4ae34dba2b00000009-default-sink
b3b6877727df4f4ae34dba2b00000009-default-source
...

$ cat ~/.pulse/b3b6877727df4f4ae34dba2b00000009-default-source
alsa_output.pci-0000_04_02.0.analog-stereo

$ cat ~/.pulse/b3b6877727df4f4ae34dba2b00000009-default-sink
alsa_input.pci-0000_00_1b.0.analog-stereo

Is there a function call in GStreamer or Pulseaudio to get these values, 
or should I simply read the files.

Kindly
 Moma Antero