[theora] [PATCH] splayer aspect ratio + zoom
giles at xiph.org
Wed Jul 23 17:41:50 PDT 2003
On Thursday, July 24, 2003, at 12:15 AM, Markus Meyer wrote:
> The patch implements it so that when either numerator or denominator is
> zero, the given aspect ratio is ignored, thus preserving the aspect
> ratio of the given pixels (f.e. 2:1 for 640x320 video). This could be a
> viable interpretation for 0:0, but I still think that the situation
> where only one number is zero should be illegal.
A ratio of 0:0 actually means 'unknown'. That's just borrowed from the
YUV4MPEG2 file format the example encoder uses. In practice players
should either treat this as the same at 1:1 or try to guess (or let the
user select) based on the frame aspect ratio.
I'm inclined to keep the distinction. You have to check for 0 and 0:0
anyway if they're illegal values, and it lets apps be a little more
sophisticated if they want.
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