[Webkit-unassigned] [Bug 216039] New: [MSE][GStreamer] Support Google Dynamic Ad Insertion (DAI)

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=216039

            Bug ID: 216039
           Summary: [MSE][GStreamer] Support Google Dynamic Ad Insertion
                    (DAI)
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Media
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: eocanha at igalia.com

DAI inserts advertisements in the middle of a regular MSE video by appending the ad video data and letting it be played. Then, the regular video data continues being appended and played.

What happens on the DAI transitions between regular and advertisement videos (and back) on MP4 is that each track has a different stream id, so qtdemux doesn't reuse streams and created a new pad/stream/track for the new piece of video. Our current code only supports a single simultaneous track per SourceBuffer, so it "disables" the second (new) one by attaching a black hole probe which drops all the buffers. Right after the new pad is created, the old pad/stream/track is removed, so in the end only a single "disabled" track remains.

For more info and test cases about Google DAI, have a look at:
https://developers.google.com/interactive-media-ads/docs/sdks/html5/dai
https://github.com/googleads/googleads-ima-html5-dai

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