Hans Verkuil wrote: > On Wednesday 19 December 2007 18:23:55 Richard Atterer wrote: > >> On Wed, Dec 19, 2007 at 05:36:09PM +0100, Hans Verkuil wrote: >> >>> I think that this might be an ideal opportunity to develop a v4l2 >>> library that can be used by applications to access v4l devices. >>> >> Oh yes, very much agreed! >> >> The library should >> - provide a single API to access both v4l1 and v4l2 >> - maybe allow non-v4l devices (network cams) >> - make it easy to get a picture from any detected cam in a >> particular format (and e.g. perform MJPEG decoding or resolution >> rescaling along the way) >> - provide a standard plug-in API (maybe gstreamer-like) for the >> video stream. This is necessary to support stuff like software >> autofocus for some Logitech webcams, or for turning the picture >> upside down (necessary for some webcams built into notebooks) >> - extend the plugin API to controls, e.g. allow automatic framerate >> (i.e. shutter speed) selection by user-supplied software as well as >> framerate selection by the webcam's firmware. >> - provide a standard way for controls like brightness, focus, motor >> controls. Emulate controls like brightness in software >> > > - standard API to scan for channels (TV & radio), preferably also > setting a standard config format containing the channel info. > - simple video format conversions for the various YUV/RGB formats. > - storing and retrieving card preferences (e.g. recording volume, > brightness, MPEG encoder settings, etc.) > > The biggest initial problem is deciding how low or high level the > library will be. I actually think that it might be a good idea to have > perhaps two libraries: one for low-level stuff (i.e. just a relatively > thin layer on top of v4l) and a high-level library allowing format > conversions, etc. > > since applications need to be changed in that case it might go hand in hand with following BSD project: http://www.nabble.com/Updated-cx88-snapshot-td14358084.html finally only one API might serve support for both and maybe more OSes Markus > Hans > > >> The following is a start, but AFAICT nothing has happened WRT an >> implementation (?): >> <http://linuxtv.org/v4lwiki/index.php/V4L2UserspaceLibrary> >> >> This is a start from a different perspective, quite a bit more >> low-level, not enough for many of my requirements above: >> <http://www.quickcamteam.net/software/libwebcam> >> >> Cheers, >> >> Richard >> > > > > _______________________________________________ > linux-dvb mailing list > linux-dvb@xxxxxxxxxxx > http://www.linuxtv.org/cgi-bin/mailman/listinfo/linux-dvb > > > _______________________________________________ linux-dvb mailing list linux-dvb@xxxxxxxxxxx http://www.linuxtv.org/cgi-bin/mailman/listinfo/linux-dvb
