[vorbis] Performance tests

[Jack Moffitt]

> If you really want to be accurate with CPU usage, I'd use the
> following procedure:
> 
> $ cat test.ogg > /dev/null ; time xiph-cvs/vorbis/examples/decoder_example < test.ogg > /dev/null
> $ cat test.mp3 > /dev/null ; time mpg123 <decode and write to /dev/null, not just test decode> test.mp3
> $ cat test.mp3 > /dev/null ; time mpg321 <decode and write to /dev/null, not just test decode> test.mp3

This is slightly wrong.  decoder_example is slow.  vorbisfile_example is
much faster, because of the inline asm that does float->int conversion.

use vorbisfile_example, since that's also what most players use.

jack.

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