> On 30 Jun 2015, at 12:49, Julien Isorce <[email protected]> wrote: > > Hi, > > I am not sure if clearkey allow you to access the raw video data after > decryption and decoding.
I don’t think clear-key has strong requirements in that regard. It’s not meant to be used for real deployments, as far as I know. > If not you I know only 2 solutions: > > - decoder and renderer can be setup to support DRM. I think a such setup can > only happen at driver level. And ideally CPU should not be able to access > this raw data. > In the case of HW decoder and GL driver it will prevent to download the > gltexture. For ex: you get a blackframe, same if you try to read back the > content of the framebuffer. > It will allow to safely manipulate gltexture ids in webkit compositing engine. > I do not know if there are such existing GPU drivers. I remember seeing some > DRM structure members in openmax platform specific headers on Raspberry-Pi > but not sure if this is related and/or usable. > > - if the platform does not support DRM, it should fallback to video hole > punching. A third-party will have to provide a gst element that implements > these GStreamer DRM interfaces/meta. DRM support in GStreamer should be such > that it allows to do that :) In that maybe we can revive this patch: > https://bugs.webkit.org/show_bug.cgi?id=141560 > <https://bugs.webkit.org/show_bug.cgi?id=141560> > > I am not sure how CDM comes into the game but I guess this is the API that > will connect EME javascript API to the gstreamer media player. > Yes, the CDM would request decryption keys and pass them to the decryptor, using an OOB event, for instance. > What will be the sink and src caps for this GStreamer ClearKey decryptor ? > application/x-cenc, original-media-type=(string)video/x-h264, protection-system=(string)58147ec8-0423-4659-92e6-f52c5ce8c3cc and video/x-h264 Same with audio/mpeg. > As far as i know video hole punching is the technique used by chromium to > support EME (I think video hole has been introduced in chromium in the first > place to have EME on Android) > > I really wonder how iOS does support/implement EME ? (hole or driver) > Maybe ask in webkit-dev :) Philippe
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