[Webkit-unassigned] [Bug 237780] New: [MSE][SourceBuffer] Fix removal of paddings from buffered range

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=237780

            Bug ID: 237780
           Summary: [MSE][SourceBuffer] Fix removal of paddings from
                    buffered range
           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

This change fixes high memory usage in apps that do TS -> MP4 transmuxing. The high memory usage is observed in some streams that have a slight overlap in media samples (usually happens on video quality change), when application applies its own logic for samples removal (that looks like sourceBuffer.remove(sourceBuffer.buffered.start(0), ...)).

Current implementation reports a buffered range that is inconsistent with the actual samples that are still in the buffer (after range removal). The reported range excludes one sample, allowing that sample to "leak". Such a sample holds a reference to the entire appended chunk (due to in-place demuxing in GStreamer MSE backend), but it accounts only for a small size in the buffer. So eviction algorithm doesn't kick in.

See the full discussion of this problem here:
https://github.com/WebPlatformForEmbedded/WPEWebKit/pull/797#discussion_r818973424

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