Attempt to control the display rate #24
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If we've already seen a FrameInfo packet, don't draw image immediately but wait until if FrameInfo pair arrives (they are sent in alternatively).
When working on slow computer (ie Raspberry Pi) the LiveView would lock up, with the camera eventually closing the conneciton. This patch attempts to rate match the camera and display by running a rolling average on the duration between frames, dropping frames if if the display is too slow.
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This is the first stab at fixing bug #21
Raspberry Pi still stalls/pauses a lot, but is able to recover. Ran continuously for over an hour and was still display at fairly low lag at the end. I think that WiFi dongle I am using might be/have a soft MAC where the processor is heavily used to make WiFi function.
Strangely it seemed to work 'smoother' whilst microwaving dinner - perhaps more RF interference is a good thing... ;-)