Use generic byte blobs for formats. We currently use them to store
gstreamer caps but we could also use them to exchange serialized
GVariants if we want.
Make properties a variant dictionary
Add the beginnings of a pulsevideosink
Make a new client-source object for every client that wants to provide
a stream. The client will have a handle to write the stream to.
Add introspect API
Move private things to private.h
Use custom main-context for the context, and ensure everything is called
from the custom main-context. does not work well with glib proxy signals
yet.
Work with custom mainloop in the gstreamer element.
Add a source gstreamer element
Expose error in context
Make it possible to set the source in the error state
Add properties to a stream and use those to get a source-output
Fix signal for new-buffer
Attach the socket source to the thread default mainloop
Make subscribe cancellable.
Propagate state and error in context.
Add bus handler for v4l2 source
Use negotiated properties to set capsfilter in v4l2
Fix subscribe in test-client
