[Theora-dev] aspect ratio ?
Wed Jul 14 08:00:22 PDT 2004
<1089811034.25780.7.camel at x30> <1089813740.25780.13.camel at x30>
Message-ID: <20040714150022.GA386 at ghostscript.com>
On Wed, Jul 14, 2004 at 04:02:20PM +0200, j at thing.net wrote:
> 13. Read a 24-bit unsigned integer as PARN.
> 14. Read a 24-bit unsigned integer as PARD. Together with PARN,
> these specify the aspect ratio of the pixels within a frame, defined as
> the ratio of the physical width of a pixel to its physical height. This
> is given by the ratio PARN : PARD. Either of these fields MAY be
> zero, in which case the pixel aspect ratio defaults to 1 : 1.
FWIW, I'd rather a value of 0 or */0 indicate 'unknown', as in:
Either of these fields MAY be zero, indicating that the pixel aspect ratio
is 'unknown' and the decoder MAY default to 1:1 or attempt to guess based
on other information available to it.
Perhaps the second MAY should be a SHOULD?
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