Hi Bill, On Thu, 2002-05-23 at 19:54, Bill Eldridge wrote: > Gerd Knorr wrote: > > bttv 0.8.x doesn't lock v4l1 captures (i.e. you can't get exclusive > > capture access using the v4l1 API, with multiple applications capturing > > at the same time both will receive frames with lower frame rate). > > Is this deterministic, such as both applications get exactly 50% of > the frames, or does it depend as well on how the applications do > the calling (assuming the applications aren't completely braindead). BTTV 0.8 uses a capture queue (list), so I suppose that v4l1-buffers are just appended to this queue (list). So the amount of frames they get depends on how many frames they queue at the same time. Let's say that app 1 only uses 2 buffers and app 2 uses 32. Then of the 34 queued buffers, app1 gets 32 and app2 gets 2 (and they re-queue them all subsequently). So it all depends on the application. I'll work on a similar thing (queue list) in the zoran driver, it's much better than the current design... Ronald -- - .-. - /V\ | Ronald Bultje <rbultje@xxxxxxxxxxxxxxxxxxx> - // \\ | Running: Linux 2.4.18-XFS and OpenBSD 3.0 - /( )\ | http://ronald.bitfreak.net/ - ^^-^^
