574eaa4cda
- Add alpha accessors to PlanarYuvBuffer interface, null by defualt. - Add WrapI420ABuffer() that creates a container which implements these accessors. - Show the use via StereoDecoderAdapter. This CL is the step 2 for adding alpha channel support over the wire in webrtc. See https://webrtc-review.googlesource.com/c/src/+/7800 for the experimental CL that gives an idea about how it will come together. Design Doc: https://goo.gl/sFeSUT Bug: webrtc:7671 Change-Id: Id5691cde00088ec811b63d89080d33ad2d6e3939 Reviewed-on: https://webrtc-review.googlesource.com/21130 Reviewed-by: Magnus Jedvert <magjed@webrtc.org> Commit-Queue: Emircan Uysaler <emircan@webrtc.org> Cr-Commit-Position: refs/heads/master@{#20635}