volodya@xxxxxxxxxxxxxx wrote: > > Hi all :) > > I am from GATOS project (http://www.linuxvideo.org/gatos ). We now have a > small v4l capture module that works with Radeon All-in-Wonders. > > It's a first cut so, naturally, I have some questions: > > * in the card the alternating TV fields (odd and even) are captured > in two separate buffers. Right now the module presents them as > consequetive frames (so that NTSC stream 640x480@30hz interlaced > becomes 640x240@60hz), which is wrong. How do I tell through v4l > interface that every other frame is odd one ? v4l2 has buffer flags for even/odd field, v4l has not. Is there any way to capture both fields interleaved into one buffer? Using pitch = 2*scanlinelength or something like that? Applications expect the image interleaved in one buffer ... > * what are the features most desired in a v4l driver ? capture / overlay? For the Radeon probably capture is more important, as overlay is available throught Xvideo, right? > * if someone can give some links to capture tools/encoders etc > for compatibility testing this would be much appreciated Any v4l app should work (in theory ...). There is no test suite (at least I don't know any ...). > * do we need to get a define in videodev.h ? how many ? > (there are different All-in-Wonder cards: mach64, Rage128, Radeon > and they come with different decoder chips). Just mail a diff with the new #defines to Alan ... > * is there an issue of latency versus number of buffers versus > reserved space ? Any comments from people who care about such > stuff ? Using more (than two) capture buffers basically reduces the risc that you lose frames on temporary CPU load peaks. Gerd -- Netscape is unable to locate the server localhost:8000. Please check the server name and try again.
