Using V4L as sub process (thread/fork, ANYTHING!!!!)

[David J. Topper]

I've tried every way to Sunday to get a V4L type process to run separately from within my GTK app. Unfortunately, it seems as though (the bttv driver at least) does not function in a manner consistent with gdk_input_add() so I'm left to some kind of hack:

signal() -> eventually hangs the app ... most likely due to some kind of out of sync read.

pthread() -> when joined, my while(1) (used to read video bytes) read loop hangs the app as well ... eg., I just wait forever for a return.

pthread() -> when thread is not joined, I get an Xlib error about some kind of async. I guess the v4l drivers are not thread safe?

gtk_adjustment / signal connection -> it seems as though the signal mechanism will get caught in an infinite loop and not return control. EG., I'm connecting "draw_video" to a gtk_adjustment and changing that adjustment's value with each read

I'm open to suggestions here ... as I'm fresh out.

Thanks,

DT
--
Technical Director, Virginia Center for Computer Music



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