[Webkit-unassigned] [Bug 184737] New: [MSE] Add allSamplesInTrackEnqueued event

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=184737

            Bug ID: 184737
           Summary: [MSE] Add allSamplesInTrackEnqueued event
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Media Elements
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: aboya at igalia.com

MediaSource has a .endOfStream() method to signal when there are no more frames
after the ones currently buffered.

This bit of data is important for some multimedia frameworks. For instance, in
GStreamer a stream of frames being decoded should be terminated by a
'end-of-stream' (EOS) event that has a similar meaning. Some GStreamer elements
will expect this event in order to work properly under some circumstances.

Unfortunately currently WebKit provides no mechanism for this: an event of
sorts should be emitted after no more frames are going to be enqueued to signal
the end of the stream. The closest mechanism WebKit has for this is
`markEndOfStream()`, but it's not exactly the same: markEndOfStream() informs
that -- as far as network buffering is concerned -- we are done; but at that
point there may still be (and often are) many frames waiting in the
decodeQueue, so it would be wrong to signal the decoder that there are no more
frames.

This patch introduces a new optional method in SourceBufferPrivate,
`allSamplesInTrackEnqueued(const AtomicString& trackID)` that is called
whenever the MediaSource is in "ended" state (the user has called
`MediaSource.endOfStream()`) and the decodeQueue is empty. Media framework
implementations can use this method to send a EOS event to a decoder that needs
it.

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