The MediaTrackSupportedConstraints
dictionary's logicalSurface
property indicates whether or not the logicalSurface
constraint is supported by the user agent and the device on which the content is being used.
The supported constraints list is obtained by calling navigator.mediaDevices.getSupportedConstraints()
.
isLogicalSurfaceSupported = supportedConstraints.logicalSurface
A boolean value which is true
if the logicalSurface
constraint is supported by the device and user agent.
This method sets up the constraints object specifying the options for the call to getDisplayMedia()
. It adds the logicalSurface
constraint (requesting that only logical display surfaces—those which may not be entirely visible onscreen—be included among the options available to the user) only if it is known to be supported by the browser. Capturing is then started by calling getDisplayMedia()
and attaching the returned stream to the video element referenced by the variable videoElem
.
async function capture() {
const supportedConstraints = navigator.mediaDevices.getSupportedConstraints();
const displayMediaOptions = {
video: {},
audio: false,
};
if (supportedConstraints.logicalSurface) {
displayMediaOptions.video.logicalSurface = "monitor";
}
try {
videoElem.srcObject =
await navigator.mediaDevices.getDisplayMedia(displayMediaOptions);
} catch (err) {
}
}