зеркало из https://github.com/mozilla/gecko-dev.git
7af48eb06f
This patch makes the media statistics report values with a fixed frames per second and a dynamic dropped ratio when resistance fingerprinting is enabled. The dropped rate is decided by the video resolution that it will report a fixed dropped rate when the video resolution is greater than 480p. And It will report a zero dropped rate if the video is below or equal to 480p. In addition, it adds three new prefs that allow us to change the value of frames per second, the dropped ratio and the threshold of target video resolution. The three prefs are 'privacy.resistFingerprinting.video_frames_per_sec', 'privacy.resistFingerprinting.video_dropped_ratio' and 'privacy.resistFingerprinting.target_video_res'. The default values of them are 30, 5 and 480, which means 30 frames per second, 5 percent dropped ratio and 480p. This also adds a new helper function 'nsContentUtils::ShouldResistFingerprinting(nsIDocument* aDoc)' for checking whether fingerprinting resistance is enabled for a given docuemnt. If it is a chrome document, this function will indicate that fingerprinting resistance is not enabled regardless of the pref 'privacy.resistFingerprinting'. If it is a content document, the result will depend on the pref. MozReview-Commit-ID: FbSuRq6Zdnn --HG-- extra : rebase_source : a62a1be19d9b38520f9eed7164fb258e3354d228 |
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