Add circular buffer for recording

[waveform80]

There's a rather cool patch that's just landed in raspivid (raspberrypi/userland#132) which permits recording to a circular in-memory buffer and then permitting the last n seconds (where n <= the length of the buffer) to be dumped to disk on a key-press.

It's currently possible to implement this in picamera, but non-trivial as it'd involve firstly building a custom stream to replicate the circular buffer, and then dealing with the MMAL interface to figure out the location of the SPS headers and I-frames (actually the latter could probably be done with the new frame property, but not the former currently).

We should make this easier for new users firstly by providing such a circular stream in the package, and secondly by making it easier to query the location of SPS headers.

[bennuttall]

w00t!

Ben

On 9 January 2014 21:23, Dave Jones notifications@github.com wrote:

Closed #39 #39 via 7ef66e17ef66e1
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