[Webkit-unassigned] [Bug 189924] New: [MSE][GStreamer] Use sentinel buffer to detect end of append

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=189924

            Bug ID: 189924
           Summary: [MSE][GStreamer] Use sentinel buffer to detect end of
                    append
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: WebKit Gtk
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: aboya at igalia.com
                CC: bugs-noreply at webkitgtk.org

This patch introduces a new mechanism to detect when an append has
been consumed completely by the demuxer. It takes advantage of the
fact that buffer pushing is synchronous: both the appsrc and the
demuxer live in the same streaming thread. When appsrc pushes a
buffer, it's actually making a qtdemux function call (it calls its
"chain" function). The demuxer will return from that call when it has
finished processing that buffer; only then the control returns to
appsrc, who can push the next buffer.

By pushing an additional buffer and capturing it in a probe we can
detect reliably when the previous buffer has been processed.
Because the pipeline only has one thread, at this point no more frames
can arrive to the appsink.

This replaces the old method of detecting end of append which relied
on the `need-data` event, which is more difficult to handle correctly
because it fires whenever the appsrc is empty (or below a given
level), which also happens when a buffer has not been pushed yet or
in response to a flush.

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