Em 10-09-2010 04:38, Marek Szyprowski escreveu: > Hello, > > On 2010-09-10 13:27, Mauro Carvalho Chehab wrote: > >>>> 1) it lacks implementation of read() method. This means that vivi driver >>>> has a regression, as it currently supports it. >>> >>> Yes, read() is not yet implemented. I guess it is not a feature that would >>> be deprecated, right? >> >> Yes, there are no plans to deprecate it. Also, some devices like cx88 and >> bttv >> allows receiving simultaneous streams, one via mmap, and another via read(). >> This is used by some applications to allow recording video via >> ffmpeg/mencoder >> using read(), while the main application is displaying video using mmap. > > Well, in my opinion such devices should provide two separate /dev/videoX > nodes rather than hacking with mmap and read access types.
Why? V4L2 API allows to have multiple applications opening and streaming. There's nothing wrong with that, since it is a common practice in Unix to allow multiple opens for the same device. Cheers, Mauro -- To unsubscribe from this list: send the line "unsubscribe linux-media" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
