[vorbis] Adding ao_get_latency() ?

[rik at kde.org]

I've added ao_get_latency to my copy of ao.

This function allows you to discover the number of bytes that are
buffered between yourself and the speakers.

Status for the various devices:
* null    - implemented (just returns 0.)
* wav     - implemented (just returns 0.)
* esd     - implemented but untested.
* oss     - implemented.
* alsa    - implemented.
* arts    - implemented.
* solaris - stub.
* irix    - stub.

The number returned should be fairly reliable. It is useful for anyone
who wants to do something like synchronise a level meter with actual
sound output time.

Rik


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