[Webkit-unassigned] [Bug 166620] New: [MSE][GStreamer] Avoid QUOTA_EXCEEDED_ERR when seeking to a buffered range just before the buffered one

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=166620

            Bug ID: 166620
           Summary: [MSE][GStreamer] Avoid QUOTA_EXCEEDED_ERR when seeking
                    to a buffered range just before the buffered one
    Classification: Unclassified
           Product: WebKit
           Version: WebKit Local Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Media Elements
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: eocanha at igalia.com

SourceBuffer::evictCodedFrames() sometimes finishes without evicting any buffered range in cases where eviction would actually be possible. This triggers a QUOTA_EXCEEDED_ERR on GStreamer platforms.

One of such cases is when seeking to an unbuffered range just before the buffered one. For example, if range [120, 300] was buffered, seek to 115 would fail. EvictCodedFrames() will try to evict ranges from the begining of the media timeline until "currentTime - 30 seconds". Then, only if there are buffered ranges *containing* the currentTime (except if it's the last range), will the algorithm try to evict future content from the end of the media timeline back to the current time until "currentTime + 30". However, as the seek target position isn't buffered in the example above, this second part of the algorithm will never run and the [120, 300] range will never be evicted.

A proposal to fix this would be to remove the "only if there are buffered ranges *containing* the currentTime" condition to enter into the second part of the algorithm.

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