[Webkit-unassigned] [Bug 157290] New: [MSE] postpone selecting media engine until type information is available

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=157290

            Bug ID: 157290
           Summary: [MSE] postpone selecting media engine until type
                    information is available
    Classification: Unclassified
           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: eric.carlson at apple.com

HTMLMediaElement::loadResource is called when a media element's src attribute is set/changed. It calls MediaPlayer::load with the url and content type (and media source when loading MSE), and MediaPlayer is supposed to choose the most appropriate media engine for the media type. The content type is always empty when loading from video.src, so we can't choose a media engine based on that and end up blindly selecting the first engine, MediaPlayerPrivateAVFoundationObjC. When loading a media source or media stream, the first media engine immediately rejects the call to load(), so we try the next engine, and the next if that fails, etc, etc, until one succeeds or they all fail.

While we can add methods to the MediaPlayerPrivate interface to avoid create an engine only to immediately destroy it ("mseSupported, etc), we can't have more than one MSE engine (eg. a mock engine for testing) until we have the content type made available to MediaSource::addSourceBuffer.

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