Re: [FFmpeg-devel] Add Mediacodec audio decoders support

[Michael Niedermayer <michael@niedermayer.cc>]

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On Wed, Jul 17, 2024 at 11:38:33AM +0200, Anton Khirnov wrote:
> Quoting Cosmin Stejerean via ffmpeg-devel (2024-07-16 22:14:19)
> > 
> > 
> > > On Jul 16, 2024, at 8:24 PM, Rémi Denis-Courmont <remi@remlab.net> wrote:
> > > 
> > > Le tiistaina 16. heinäkuuta 2024, 18.48.06 EEST Cosmin Stejerean via ffmpeg-
> > > devel a écrit :
> > >> To add another data point, the platform decoders might also be more secure
> > >> due to sandboxing. I believe as of Android Q the software decoders provided
> > >> by MediaCodec have been moved to run within a constrained sandbox.
> > > 
> > > Platform decoders are in all likelihood strictly less secure than software 
> > > decoders. Software decoders will run in a user-space sandboxed within their 
> > > respective application. Platform decoders will run in a more privileged system 
> > > service, with direct access to a kernel driver in EL1, through that to the 
> > > firmware running on the video DSP.
> > > 
> > > More performant and energy-efficient. But also way way less secure.
> > > 
> > > The only viewpoint whence this is more secure, is the content publisher's: 
> > > this model enables DRM with hardware pass-through (but that does not even 
> > > apply if you use FFmpeg as the front end).
> > > 
> > 
> > Platform provided *software* decoders should be more secure than bundled software decoders due to the sandboxing of software decoders in recent versions of Android.
> 

> If that is such an important feature to someone then it is not
> inconceivable to implement some sort of sandboxing inside avcodec.
> 
> I'm not a big fan of the argument "we should provide passthrough to
> proprietary decoders because they are more secure".

+1

thx

[...]
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