[theora-dev] Specific code questions
dan at on2.com
Sat Sep 14 15:40:28 PDT 2002
> Ah, Write32ToBuffer is doign the flipping. What an odd little bitpacker.
hmm... so I guess my previous post was all wrong? Or perhaps I'm confused, and this routine is doing just what I said -- making sure the byte order is the same on all architectures? I'm going to check into this with those who know what is going on. I apologize for shooting off before I had my information straight.
(At one point I wrote a 32 bit version of the Ogg bitpacker that did
byte flipping when necessary, and it turned out to be slower than the
8 bit packer we use now. Also, you have the lowest level bithandling
operations split between several C modules; this will kill any chance
at compiler optimization).
Anyway, it appears that the bitpacker used by VP3 is the exact
opposite packing order used by Ogg... Ah well.
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