KTp/Components/Call UI

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The plan

The current code is wrong by design, needs to be replaced.

Build a simple Qt library that exports the whole call application logic with a QML-izable interface, using QtGStreamer/farsight/farsight utils/telepathy-qt4.

Build a GUI that possibly consists of a standard KXmlGuiWindow that embeds a QDeclarativeView, which implements the call GUI.

Blockers

Needs telepathy-qt4 to export interfaces for the Call spec.
- tp-qt4-yell exports them now. will soon be merged to tp-qt4.
Needs a QML video widget in QtGStreamer.
- this is work in progress.
- we need it if and only if we build the interface using QML.

GUI Ideas

Alvaro's mockup

empathy's new call UI mockup

Dependency hell

telepathy-qt:
- Provides Qt high level api to telepathy.
- http://cgit.freedesktop.org/telepathy/telepathy-qt4/

telepathy-qt-yell:
- Provides Qt high level api for the Call interface (will be merged to tp-qt at some point)
- http://cgit.freedesktop.org/telepathy/telepathy-qt4-yell/

qt-gstreamer:
- Provides Qt bindings for GStreamer
- http://cgit.freedesktop.org/gstreamer/qt-gstreamer

farstream:
- This is the library and gstreamer elements that do the actual media streaming.
- http://cgit.collabora.com/git/farstream.git/

telepathy-farstream:
- Provides the glue between telepathy CMs and farsight2/farstream.
- http://cgit.freedesktop.org/telepathy/telepathy-farstream/
- (Note: use the telepathy-farstream-0.1 branch with farsight2 / master is to be used with farstream)

How it all blends together

telepathy-qt-yell provides the Tpy::CallChannel class, which wraps the Channel.Type.Call d-bus object. From this object, we create a TfChannel (provided by tp-farstream) and we wrap it in a QTf::Channel object (provided by libqtf inside the call-ui repository; this is qt-gstreamer based bindings for tp-farstream). This TfChannel object does all the internal communication with the CM and constructs some GStreamer bin (using farsight2/farstream internally) that will do all the streaming. On this bin, we connect our GStreamer sources and sinks using the QtGStreamer API.