Add state setters to MediaSourceAttachment (C25) #4104
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In preparation for cross-thread MediaSource objects, a small amount of state and associated setters are being added to the MediaSourceAttachment interface. This will allow for a push model, instead of a pull model, for state such as recent media timestamps, and the error status of the HTMLMediaElement. Usage of these setters is gated through the `"MediaElement.EnableUsingMediaSourceAttachmentMethods"` H5VCC flag. This flag needs to be coordinated between a `HTMLMediaElement`, the attached `MediaSource`, and all `SourceBuffers` used. As such, the value of the flag when the `HTMLMediaElement` was created is used to coordinate the state of the rest of the related objects. This prevents a flag mismatch, such as if the H5VCC value is updated after the `HTMLMediaElement` has been created but before the `MediaSource` is created. This is based off of the following Chromium changes: * https://chromium-review.googlesource.com/c/chromium/src/+/2391934 * https://chromium-review.googlesource.com/c/chromium/src/+/2401808 b/338425449
borongc
approved these changes
Sep 11, 2024
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In preparation for cross-thread MediaSource objects, a small amount of state and associated setters are being added to the MediaSourceAttachment interface. This will allow for a push model, instead of a pull model, for state such as recent media timestamps, and the error status of the HTMLMediaElement.
Usage of these setters is gated through the
"MediaElement.EnableUsingMediaSourceAttachmentMethods" H5VCC flag. This flag needs to be coordinated between a HTMLMediaElement, the attached MediaSource, and all SourceBuffers used. As such, the value of the flag when the HTMLMediaElement was created is used to coordinate the state of the rest of the related objects. This prevents a flag mismatch, such as if the H5VCC value is updated after the HTMLMediaElement has been created but before the MediaSource is created.
This is based off of the following Chromium changes:
https://chromium-review.googlesource.com/c/chromium/src/+/2391934
https://chromium-review.googlesource.com/c/chromium/src/+/2401808
b/338425449