Virtual Dynamic Sound Card Update

[Mark Farrugia <mark.farrugia@xxxxxxxxxxxxxxxx>]

Hi all,

We have published our initial version of the Virtual Sound Driver that
we at Fiberdyne Systems have been working on recently.

The source can be found for your perusal here:
https://github.com/fiberdyne/avirt

The driver currently consists of:
- A top-level ALSA driver, avirt_core
- A low-level dummy example "Audio Path", dummyap

The top-level ALSA driver implements a dynamically configurable
abstract ALSA middle-layer interface, and would be the global point of
entry for audio streams in AGL.
The low-level driver then subscribes as an "Audio Path", resulting in
switchable kernel-space routing from the top-level driver to the
low-level driver.

The top-level driver also:
- Builds streams as individual devices, allowing for separate SMACK
security labels per sound stream (i.e. A "radio" stream can now have a
different security context to an "emergency" stream)
- Builds PCM devices with configurable names and channels, which can
be defined by 4A HALs, or externally.

We are open to suggestions and feedback.

Regards,
Mark
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