Dan Minor b64ecd9960 Check V4L2_CAP_VIDEO_CAPTURE when enumerating capture devices on Linux
The side effect of not filtering on V4L2_CAP_VIDEO_CAPTURE is that
every device is enumerated twice. Because we look up devices by name,
and the device that supports V4L2_CAP_VIDEO_CAPTURE seems to always
appear first in /dev/video, this does not seem to end up with us ever
choosing an inappropriate device. We might get away with just filtering
device names from the list, but if the order of devices ever changed in
/dev/video there could be problems.

Bug: webrtc:11641
Change-Id: I16fee4edc873838ed4643ee16a8bbc699d6bbcf5
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/176460
Reviewed-by: Per Kjellander <perkj@webrtc.org>
Commit-Queue: Dan Minor <dminor@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#31508}
2020-06-11 19:58:49 +00:00
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