[Webkit-unassigned] [Bug 231555] New: Internals.grabNextMediaStreamTrackFrame doesn't always convert to RGBA

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=231555

            Bug ID: 231555
           Summary: Internals.grabNextMediaStreamTrackFrame doesn't always
                    convert to RGBA
           Product: WebKit
           Version: WebKit Local Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: WebRTC
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: heycam at apple.com
                CC: youennf at gmail.com

I tried using Internals.grabNextMediaStreamTrackFrame for a test.  It relies on MediaSample::getRGBAImageData.  MediaSampleAVFObjC::getRGBAImageData does try to convert the sample's underlying CVPixelBuffer to RGBA, but it doesn't seem to work, at least for the case I was trying.  When the frame was using a YUV420 pixel format, the PixelBufferConformerCV failed to do a conversion and instead produced a new CVPixelBuffer with the same format.  The result is that in the test, the ImageData object passed to the grabNextMediaStreamTrackFrame Promise callback contained planar YUV data pretending to be RGBA.  I failed to trace into VTPixelBufferConformerCopyConformedPixelBuffer to work out why this wasn't working.

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