Hi Jakub, On Friday 26 July 2013 21:02:35 Jakub Piotr Cłapa wrote: > On 26.07.13 17:52, Laurent Pinchart wrote: > >>> Using omapfb, or...? I hope not > >>> omap_vout, because that's rather unmaintained =). > >> > >> Laurent's live application is using the V4L2 API for video output (to > >> get free YUV conversion and DMA) so I guess this unfortunatelly counts > >> as using omap_vout. Are there any alternatives I should look into? IIUC > >> to use omapfb I would need to manually copy RGB data into the > >> framebuffer on each frame. > > > > It should be possible to port the live application to use DRM/KMS with > > omapdrm for the display side, without requiring any memory copy. That's > > somewhere on my TODO list, but I won't have time to work on that before > > way too long. > I could look into it myself but is there any documentation on omapdrm? > > From what I found libdrm should probably be used but information about it's > API is really scarce: > https://dvdhrm.wordpress.com/2012/09/13/linux-drm-mode-setting-api/ > http://dvdhrm.wordpress.com/2012/12/21/advanced-drm-mode-setting-api/ > http://virtuousgeek.org/blog/index.php/jbarnes/2011/10/31/writing_stanalone_ > programs_with_egl_and_ > > The last one seems focused on OpenGL so I don't think it applies. > > Are there any good sources to learn about this? Or maybe some pointers on > where to start with reading source code? http://events.linuxfoundation.org/sites/events/files/lcjpcojp13_pinchart.pdf A bit of shameless self-advertising :-) It would have been clearer with the video, but it seems the talk hasn't been recorded :-/ There's also http://www.youtube.com/watch?v=Ja8fM7rTae4 that mostly focuses on the kernel side but starts with explanations of the key KMS concepts. As far as KMS is concerned, libdrm is mostly a wrapper, so any documentation on the KMS ioctls can help too. -- Regards, Laurent Pinchart -- To unsubscribe from this list: send the line "unsubscribe linux-media" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
