[Vorbis] What's the value range of float samples?

[Joost van Dongen]

We had audible problems with this in both Swords & Soldiers and
Awesomenauts. As Paul suggested, we worked around it by simply multiplying
all our samples to get them back in the -1,1 range. We multiply by
something like 0.9 or 0.99, don't remember the number exactly.

Greetz,
Joost

-
Joost van Dongen
Lead programmer / co-founder
Ronimo Gameswww.ronimo-games.com





On 10 January 2013 17:10, Paul Martin <pm at nowster.me.uk> wrote:

> On Mon, Jan 07, 2013 at 11:50:20PM +0200, Nikos Chantziaras wrote:
> > On 07/01/13 23:23, Paul Martin wrote:
> > > On Mon, Jan 07, 2013 at 08:53:56PM +0200, Nikos Chantziaras wrote:
> > >
> > >> Apparently, there are Vorbis streams that use float samples with
> values
> > >> in the range of [-32768, 32767]?
> > >
> > > GIGO.
> >
> > So the answer is no?  Vorbis float values always have a nominal range of
> > [-1,1) and I can always clamp/clip to that?
>
> If you feed in "normalized to full scale" values to any lossy encoder,
> you are likely to get overshoots on decoding.  It's good to be aware
> that this might happen and to do your volume scaling (playback gain)
> in the floating point domain before you convert to integers.
>
> You'll often notice this on YouTube videos where they clip audibly on
> playback due to insufficient headroom.
>
> --
> Paul Martin <pm at nowster.me.uk>
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