Simplify FrameBufferRenderer callback interface

Ignore-this: 4aa5ed270e468db2af73836c9956d502

Pass a VideoFrame object to the frame handler callback instead of 3 individual
attributes for the data, width and height.

The VideoFrame object has 3 attributes itself: data, width and height. It also
has a size property, which returns a (width, height) tuple.

darcs-hash:20140925090800-56b4d-6ea1f6e9b7c647e8ebbdc9bc95053cec35cdd7ce
pjsip: fix log line when creating converter

Ignore-this: 3c48c5edfb5192f1095ff6283b4d502f

Converters just convert format and resolution, so don't log the
framerate, it's deceiving.

darcs-hash:20140926083607-56b4d-7a1528ab5508711fb26b326d34d4710a5861ac80
Post notification when a remote video format change is detected

Ignore-this: 5b55261a08d982d6225dd86bb46dc8a6

darcs-hash:20140926131203-56b4d-61e90e1baf4b5da976c6c622bbd4ffdb525b77fa
pjsip: add null video device

Ignore-this: dd4c5f0106fd136a6bf9977298c1f4e3

darcs-hash:20140929134801-56b4d-976b81782cee0a4f81e3f6dc18c25a9052985067