Camera QML element and multiple QMediaService

PetrM

Hello,
I have implemented my own QMediaService providing my own camera (a camera simulator). The service is implemented as a plugin very similarly as the Qt's directshow plugin. Now I want to display my camera in Camera item (QML). The QML is as follows:

ApplicationWindow {
    visible: true
    width: 640
    height: 480

    Camera {
           id: camera		   
       }

   VideoOutput {
	   anchors.fill: parent
	   source: camera
   }
   ListView {
	   anchors.fill: parent
	   model: QtMultimedia.availableCameras
	   delegate: Text {
		   text: modelData.displayName

		   MouseArea {
			   anchors.fill: parent
			   onClicked: camera.deviceId = modelData.deviceId
		   }
	   }
   }
}

It's an example I found somewhere in the Qt Doc. It allows to switch between cameras connected to the PC and display their outputs (live image) on the screen. I have connected two cameras (the first is built-in camera and the second is and USB live cam). The application correctly displays three camera names: the two connected I mentioned and the third is my camera simulator - the QtMultimedia::availableCameras works well. The problem is that when I click on the item with my own camera (the simulator), nothing happens because QMediaServiceProviderPlugin::create() in my plugin is never called. I investigated the QT source codes and I probably found the problem:

When the Camera element is created by the QtQuick, the QCamera(QObject *parent) constructor is called and it then calls the FIRST QMediaServiceProviderPlugin loaded (the directshow plugin in this case) to create the QMediaService instance. My QMediaService is never created.

When I try:

Camera {
   id: camera
   deviceId: QtMultimedia.availableCameras[2].deviceId
}

it doesn't work from the same reason - the directshow plugin is used to create the QMediaService.

My question:
Is there a way how to make the QML program above work for multiple QMediaServiceProviderPlugin loaded?

Thanks for any usefull help.

SGaist

Hi,

One alternative that you can try is to use a wrapper object that provides the QCamera to your VideoOutput.

PetrM

@SGaist
Thanks for reply. Please could you be more concrete? I don't know how to implement it. A hint would help....

SGaist

You have to create a QObject subclass that has a property called mediaObject that will return you camera instance.

PetrM

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