How to decode multitrack ogg file?

[norbertli]

Hey, Guys.

How can I read audio data from a multitrack ogg file?
It seems like the default OggReader only read data from the first track, but I need choose one track I prefer to read.

Thanks in advance.

—file detail printed by ogginfo utility—
Processing file “output.ogg”…
New logical stream (#1, serial: bcf916f5): type vorbis
New logical stream (#2, serial: f4bec5e7): type vorbis
…
Vorbis stream 1:
Total data length: 2489559 bytes
Playback length: 8m:20.376s
Average bitrate: 39.802936 kb/s
Logical stream 1 ended
Vorbis stream 2:
Total data length: 690273 bytes
Playback length: 8m:20.376s
Average bitrate: 11.036048 kb/s
Logical stream 2 ended