Rich Felker <dalias@aerifal.cx> writes:
On Tue, Feb 19, 2008 at 07:50:27PM +0000, Måns Rullgård wrote:
Rich Felker <dalias@aerifal.cx> writes:
On Tue, Feb 19, 2008 at 06:45:05PM +0100, Michael Niedermayer wrote:
+main_flags (v) + Bit Name Description + 0 BROADCAST_MODE Set if broadcast mode is in use.
Doesn't nut.txt say bit numbering goes from highest to lowest? Of course this makes no sense for vlc bitfields... But it should probably be clarified. Or else explicit numeric values rather than but numbers should be used.
Why not make each flag its own 1-bit field? Or would that be bad for some reason I'm missing?
The flags fields are then not extensible. You have to keep adding more of them, possibly in discontiguous locations. Practically it just means slightly more wasted space in files not using obscure flags, but it's also ugly. I like vlc-flags better.
Another possibility is to precede each optional field with a 1-bit flag indicating its presence. The size of the containing element can then also implicitly exclude any unused fields at the end. This may of course not be desired for frequently repeated elements where the flags could be specified in a global header. -- Måns Rullgård mans@mansr.com