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Bug 789809 - API: new API to retrieve the device unique ID
API: new API to retrieve the device unique ID
Status: RESOLVED OBSOLETE
Product: GStreamer
Classification: Platform
Component: gstreamer (core)
git master
Other Linux
: Normal enhancement
: git master
Assigned To: GStreamer Maintainers
GStreamer Maintainers
Depends on:
Blocks:
 
 
Reported: 2017-11-02 09:37 UTC by Philippe Normand
Modified: 2018-11-03 12:42 UTC
See Also:
GNOME target: ---
GNOME version: ---


Description Philippe Normand 2017-11-02 09:37:29 UTC 
Ideally the ID would be a string, like a UUID or something similar. Opinions?

This would be needed in WebKit, for the "RealtimeMediaSourceCenter" and its friend the "CaptureDeviceManager", responsible for probing audio/video capture devices.
Comment 1 Philippe Normand 2017-11-02 15:27:56 UTC 
Another option is to add it to the device properties GstStructure, so no new API would be needed.
Comment 2 Tim-Philipp Müller 2017-11-02 15:58:14 UTC 
What would this look like in practice? Aren't there already suitable things in the extra properties? Is the goal to move the knowledge of what might be a suitably unique identifier into the device provider?
Comment 3 Philippe Normand 2017-11-02 16:38:53 UTC 
Well, it's true that depending on the OS it's possible to find the ID in properties. In the current v4l2 device provider a device.serial property is present, that could be used as unique ID I suppose :)

I'm not sure about other platforms, but I think it would be interesting to formalize the way devices are identified across all platforms instead of having each device provider potentially storing the unique identifier in different properties.
Comment 4 Philippe Normand 2017-11-14 10:54:31 UTC 
Additionally it would be nice to have a gst_device_monitor_get_device_with_id().

In WebKit the UI process needs to have a list of devices so the user can choose which one to use but the Web process also needs to access devices, so we have duplicate work unless we can run a single device monitor in the web process and pass device IDs around using IPC.
Comment 5 GStreamer system administrator 2018-11-03 12:42:35 UTC 
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