[ogg-dev] OggPCM: support for little-endianness only?

Conrad Parker conrad at metadecks.org
Wed Feb 13 18:09:34 PST 2008

On 14/02/2008, Sampo Syreeni <decoy at iki.fi> wrote:
> On 2008-02-13, Erik de Castro Lopo wrote:
> >> This is all well and good but OggPCM is in an Ogg transport stream,
> >> so that needs to be unpacked anyway.
> >
> > Fair enough. Since the ogg pages (which I beleive are 4k) need to be
> > unpacked anyway, there is little harm in having to (possibly) do
> > endswapping as well.
> I don't want to be starting no holy wars here, but... Isn't the precise
> problem that mplayer people have with ogg in that the paging structure
> necessitates too much CPU intervention, instead of allowing braindead,
> direct, DMA, scatter/gather? If so, isn't it the case that the problem
> is in ogg, not in Erik's reasoning?

yeah, totally. Erik's original argument was just about dealing with
the endianness of PCM in general, and makes sense in the context of
his libsndfile (which is most often used for formats where DMA is
possible, like wav and aiff).


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