Not Completely Open Source, But…

Tinic has developed an interface that will allow developers to extend parts of the Linux Flash Player, most notably the audio output functionality. While Player 9 for Linux only supports ALSA output, this flashsupport mechanism will allow you to write output drivers for your own favorite pet audio API. Here are the full details:

Additional Interface Support for Linux

It’s all still rather experimental but we hope this will lay the groundwork for opening up more interfaces which will allow the Player to adapt to Linux’s natural evolution.