[gstreamer-bugs] [Bug 529500] [videotestsrc] support for NV12 and NV21

[GStreamer (bugzilla.gnome.org)]

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  GStreamer | gst-plugins-base | Ver: HEAD CVS

Thijs Vermeir changed:

           What    |Removed                     |Added
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                 CC|                            |thijsvermeir at gmail.com




------- Comment #5 from Thijs Vermeir  2008-04-24 22:08 UTC -------
Like said on IRC I based this on the same stride as currently used (only the
luma) for comparable colorspaces (like I420 or YV12). No one was able to tell
where I can find the specs about the strides. The only information I can found
is on ffourcc.org [1] and that does not talk about the stride for the luma
plane just says that it is the same for the chrominance.

But after looking around how other programs did the stride I found that the
stride for I420 and YV12 is 8 in some xorg drivers[2], at least if I interpret
that code correctly. and mplayer[3] doesn't set a stride for planar colorspaces
but I don't suppose that we will take that as a reference.

So, than I have also a question:
Where are the current rounding rules based on?
Is that Xv driver or our implementation wrong?

[1] http://www.fourcc.org/yuv.php#NV12
[2]
http://www.google.com/codesearch?hl=en&q=+%22pPriv-%3EsrcPitch+%3D+(width+%2B+7)+%26+~7%3B%22+show:wkDubdvNK5M:BslqBkyo2rU:GaFsNiUf3q4&sa=N&cd=2&ct=rc&cs_p=http://www.angstrom-distribution.org/unstable/sources/xf86-video-sisusb-X11R7.0-0.7.1.3.tar.bz2&cs_f=xf86-video-sisusb-X11R7.0-0.7.1.3/src/sisusb_video.c#first
[3]
http://www.google.com/codesearch?hl=en&q=+%22mpi-%3Estride%5B0%5D%3Dmpi-%3Ewidth%3B%22+show:ONk9uu1qiqg:bZksL57wocI:ONk9uu1qiqg&sa=N&cd=7&ct=rc&cs_p=svn://svn.mplayerhq.hu/mplayer/trunk&cs_f=libmpcodecs/vf.c#l362


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