Siarhei Siamashka wrote:
Surely all
these problems can be fixed by implementing hybrid x11/framebuffer code
where x11 is responsible for keyboard input and sets video mode so that no
other application draws over a screen area used by mplayer.
Yes, the result would look like video overlay works in windows or linux
on PC - overlay draws over different windows when it shouldn't :-) We
can live with that. As for framebuffer permissions, it may be better to
relax device permissions than to run mplayer as root.
I needed a confirmation that Epson chip supports only packed
YUV formats and no planar formats are really available
Well, the conversion is done on the fly while the data is transferred to
internal epson video buffer. I guess it would be hard to do planar YUV
-> RGB without additional memory. I still don't understand how it is
done on the fly even in those packed formats since some color
information (U,V) is common for more lines. Seems like tough task. There
needs to be additional memory for remembering U,V parts from previous line.
Another interesting possibility is to relay video scaling and color conversion
(planer -> packed YUV) to DSP.
I'm not sure, is there some math involved in this or it is just memory
shuffling? I guess DSP would be really bad for memory shuffling. From
previous discussions it looks like when you add DSP to the mix all kinds
of bottlenecks appears. I wonder if gstreamer/dspfbsink could keep up
with mplayer speed doing just conversion and video output.
Oh BTW, it is off topic but I finally found what that cryptic 'Video
hardware accelerators for DCT, iDCT, pixel interpolation, and motion
estimation for video compression' feature on OMAP 1710 page means. Looks
like the DSP really has some special instructions for performing those
operations, google for spru098.pdf It is sad that default video player
is still so bad with such features implemented in hardware.
Frantisek
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