To clarify the signals from Gecko and WebKit, "No signal" should be
considered as removed from both explanations.

Hoping the Blink API owners approve this experiment - it's crucial in order
to achieve key customer use cases.

Thanks,

-Ken



On Wed, Feb 22, 2023 at 3:20 PM Corentin Wallez <cwal...@chromium.org>
wrote:

> Hey all,
>
> This is an I2E for the WebGPU / WebCodecs integration point that is not
> part of the WebGPU v1 shipment as the WebGPU W3C group decided to remove it
> from the V1 milestone. However it is a critical integration point for the
> video applications looking to use WebGPU as part of their video processing
> pipeline. So we would like to start a second original trial, specifically
> for this feature, that developers can use to keep prototyping WebGPU video
> processing after WebGPU v1 is shipped. Because of the weird nature of this
> trial, I didn't know how to fill all the fields in ChromeStatus, so let me
> know if more details are needed!
>
> Contact emailscwal...@google.com, kain...@google.com, bajo...@google.com
>
> Explainerhttps://gpuweb.github.io/gpuweb/explainer/#image-input
> https://github.com/gpuweb/gpuweb/issues/1380
>
> Specificationhttps://gpuweb.github.io/gpuweb/#gpuexternaltexture
>
> Design docs
> https://github.com/gpuweb/gpuweb/issues/1380
>
> Summary
>
> WebGPU exposes an API to create opaque "external texture" objects from
> HTMLVideoElement. These object can be used to sample the video frames
> efficiently, potentially in a 0-copy way directly from the source YUV data.
> However the WebGPU specification for the first version of WebGPU does not
> allow creating GPUExternalTextures from WebCodecs VideoFrame objects. This
> capability is important for advanced video processing applications that are
> already using WebCodecs and would like to integrate WebGPU in the video
> processing pipeline. This features adds support for using a VideoFrame as
> the source for a GPUExternalTexture.
>
>
> Blink componentBlink>WebGPU
> <https://bugs.chromium.org/p/chromium/issues/list?q=component:Blink%3EWebGPU>
>
> TAG review
>
> TAG review statusPending
>
> Risks
>
>
> Interoperability and Compatibility
>
>
>
> *Gecko*: No signal WebCodecs is listed as "worth prototyping" which
> likely means this intergration is the same.
>
> *WebKit*: No signal WebCodecs is prototyped in Safari TP, so this
> integration is likely interesting.
>
> *Web developers*: Positive
>
> *Other signals*:
>
> Ergonomics
>
> No ergonomic risk. This API would be used at the intersection of WebGPU
> and WebCodec. It is designed to keep performance as high as possible by
> allowing o-copy sampling of YUV frame data.
>
>
> Security
>
> The lifetime management of VideoFrame was taken into account of this
> feature. No other security considerations.
>
>
> WebView application risks
>
> Does this intent deprecate or change behavior of existing APIs, such that
> it has potentially high risk for Android WebView-based applications?
>
>
>
> Goals for experimentation
>
>
>
> Reason this experiment is being extended
>
>
>
> Ongoing technical constraints
>
>
>
> Debuggability
>
> No support.
>
>
> Will this feature be supported on all six Blink platforms (Windows, Mac,
> Linux, Chrome OS, Android, and Android WebView)?Yes
>
> Is this feature fully tested by web-platform-tests
> <https://chromium.googlesource.com/chromium/src/+/main/docs/testing/web_platform_tests.md>
> ?Yes
>
> DevTrial instructionshttps://github.com/gpuweb/gpuweb/issues/1380
>
> Flag name
>
> Requires code in //chrome?False
>
> Estimated milestones
>
> No milestones specified
>
>
> Link to entry on the Chrome Platform Status
> https://chromestatus.com/feature/5078348864159744
>
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