[vlc-devel] [PATCH] HW Pixel Doubling and Backlight-on for Maemo devices

[Hiltunen Tapio]

Hello,

There has been several ports of VLC to Maemo devices. This patch adds some functionality to the x11 video output driver that the Maemo porters may find useful.
These are:
- Hardware pixel doubling: reduces CPU load in case that video
  dimensions are less than half of the display dimensions (800x480 in N770 and N800). Pixel
  doubling is used only in fullscreen mode.
- Keeping backlight on during playback.
It also modifies configure.ac to provide switch --enable-maemo for inclusion of the above capabilities.

The performance of VLC in Nokia N770 is modest: fullscreen playback of a 294x240, 320 kbits/s mpeg2 -coded video with mp2-audio is possible, with only occassional framedrops. When going larger than 400x240, the pixel doubling is unuseful, and unacceptable amount of frame drops will result.
I used ffmpeg and libmad for these tests.

Regards,
Tapio Hiltunen,
Research Scientist
VTT Mobile Interaction
tapio.hiltunen at vtt.fi




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