Merge request: Implement video capture device support

[Casian Andrei]

Forgot to put the links:

For Phonon: http://gitorious.org/phonon/phonon/merge_requests/14
<http://gitorious.org/phonon/phonon/merge_requests/14>For Phonon-VLC:
http://gitorious.org/phonon/phonon-vlc/merge_requests/9

On Mon, Jun 28, 2010 at 7:41 PM, Casian Andrei <skeletk13 at gmail.com> wrote:

> Hello,
>
> I worked on Phonon video capture devices last month, as part of GSoC. I
> have reached a stage where using a V4L capture device with Phonon and
> Phonon-VLC works, so I am proposing a merge request. There is much more work
> to be done.
>
> Phonon
> ===========================================================================
> What is provided:
> - a method to get a video capture device list
> - a method to set the desired capture device by using MediaSource.
>
> Currently it works with V4L devices by using Phonon-VLC.
>
> There are also changes to AudioCaptureDevices, but these are not tested.
>
> There is a test application for video capture. It works fine on my system.
> I've
> tested it with 2 v4l devices attached. The lines that "make contact" with
> the
> changes are:
>
> // The part for grabbing a video capture device list
> QList<Phonon::VideoCaptureDevice> l =
> Phonon::BackendCapabilities::availableVideoCaptureDevices();
> m_deviceModel = new Phonon::VideoCaptureDeviceModel(l, 0);
>
> // The part for setting the current video capture device
> Phonon::VideoCaptureDevice vc = m_deviceModel->modelData(mi); // mi is the
> model index
> Phonon::MediaSource mediaSource(vc);
>
> There are other ways of doing the job, including an ugly one (by specifying
> the device name directly)
>
>
> These video capture changes are only implemented in the Phonon-VLC backend.
>
> Some of the changes just uncomment things for VideoCaptureDevice and are
> like those for AudioOutputDevice or AudioCaptureDevice.
>
> Summary of the changes:
> ------------------------------------
> backendcapabilities.h --
> availableVideoCaptureDevices()
> signals for changed video devices
>
> factory_p.h --
> signals for changed video devices
>
> globalconfig.h --
> deviceProperties(Phonon::ObjectDescriptionType, index)
> audioOutputDeviceProperties(index)
> audioCaptureDeviceProperties(index)
> videoCaptureDeviceProperties(index)
>
> videoCaptureDeviceListFor(Phonon::Category)
> videoCaptureDeviceFor(Phonon::Category)
>
> phononnamespace.h.in --
> added an enum for CaptureDeviceType. It can be either invalid, or V4LVideo
> or Audio. It is used by the MediaSource to know that it uses a capture
> device and act accordingly (by using deviceName). This enum may be used for
> other types of capture devices, for instance ones that don't have anything
> to do with a device name. V4L isn't platform independent, but this name can
> be changed because it is mostly used internally. The exception is when
> creating a MediaSource by providing a platform-dependent device name.
>
> mediasource.h --
> constructors for creating a media source from Phonon::AudioCaptureDevice or
> Phonon::VideoCaptureDevice or directly by giving Phonon::V4LVideo and
> /dev/videoX
>
> added captureDeviceType, audioCaptureDevice, videoCaptureDevice to the
> MediaSource data
>
> objectdescription.h --
> added VideoCaptureDeviceType
>
>
> Phonon-VLC:
> =================================================================
> What is provided:
> - get video capture device list (v4l currently)
> - handle v4l capture devices in MediaObject::setSource()
>
> The most changes are in the DeviceManager. The AudioOutputDevice class has
> been
> changed into a more generic DeviceInfo class. The DeviceManager is able to
> provide
> lists for audioCaptureDevices, videoCaptureDevices and audioOutputDevices.
>
> The backend can pass a list of v4l devices to Phonon.
>
> There are 2 new files (header + cpp) for grabbing a list of v4l capture
> devices. scanDevices() probes what it can find in /dev/videoX. The code is
> adapted from vlc
> from v4l2 access.
>
>
> -------------------
> Best regards,
> Casian
>
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