[vorbis] Amplify Ogg files without decode/encode

[Michael Smith]

>It would be possible, I think, to change the stream format to add some sort of
>"volume escape" packet or something, but it's not currently there.  This is
>very annoying, actually, as the ability to easily munge a vorbis file to add
>fade-in/fade-out would be very nice.  Along the same lines, for editing
>purposes, it would be nice to have some sort of escape that would tell the
>player (or whatever) to ignore the first (or last) n PCM samples in a stream.

I think it should be possible (though maybe difficult) to adjust volume
without a full reencode. Not sure of details, though. Would need to read
some source again.

As for your other suggestion of allowing one to ignore n samples at the 
start/end of the stream, this exists already (and has for a long time).
vcut is a tool which adjusts these for specific purposes - libvorbis uses
them when decoding, of course.

Michael

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