[Webkit-unassigned] [Bug 230672] New: [MSE] appending to the source buffer will not throw when the source buffer is full.

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=230672

            Bug ID: 230672
           Summary: [MSE] appending to the source buffer will not throw
                    when the source buffer is full.
           Product: WebKit
           Version: Other
          Hardware: Unspecified
               URL: https://jyavenard.github.io/htmltests/tests/mse_webm/s
                    izeSourceBuffer.html
                OS: Unspecified
            Status: NEW
          Keywords: Regression
          Severity: Normal
          Priority: P2
         Component: Media
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: jean-yves.avenard at apple.com

Consider the following test.

It adds 1MB of content (about 5s of content) to a source buffer. Playback doesn't start so currentTime = 0

On Safari, after adding 318MB worth we see the buffered range going from:
3003: SourceBuffer buffered ranges grew from TimeRanges: [0.007, 677.601) to TimeRanges: [0.007, 679.47)
3003: 318777183 bytes added
3003: Loading buffer: [0, 1000000)
3031: SourceBuffer buffered ranges grew from TimeRanges: [0.007, 679.47) to TimeRanges: [2.001, 668.138)[679.478, 681.872)
3031: 319777183 bytes added

As you can see the first 2 seconds were evicted ; and then the last 10s before the content is appended.

With the first seconds being evicted, the content is no longer playable.

If we continue to append:
 buffered ranges grew from TimeRanges: [2.001, 668.138)[691.778, 698.889) to TimeRanges: [2.001, 668.138)[691.778, 700.641)
3166: 329777183 bytes added
3166: Loading buffer: [0, 1000000)
3189: SourceBuffer buffered ranges grew from TimeRanges: [2.001, 668.138)[691.778, 700.641) to TimeRanges: [2.001, 668.138)[691.778, 698.898)[700.658, 704.795)
3189: 330777183 bytes added
3190: Loading buffer: [0, 1000000)

We end up with gaps here and there:
after appending 1.6GB of data we have:
 buffered ranges grew from TimeRanges: [2.001, 668.138)[691.778, 698.889) to TimeRanges: [2.001, 668.138)[691.778, 700.641)
3166: 329777183 bytes added
3166: Loading buffer: [0, 1000000)
3189: SourceBuffer buffered ranges grew from TimeRanges: [2.001, 668.138)[691.778, 700.641) to TimeRanges: [2.001, 668.138)[691.778, 698.898)[700.658, 704.795)
3189: 330777183 bytes added
3190: Loading buffer: [0, 1000000)

So effectively, we continue to just evict data , playback can't start and QuotaExceededError is never thrown

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