[guardian-dev] getting a native FD from my iocipher disk

[Josh Steiner]

Very interesting idea!  I'll take a crack at porting your demo app to
IOCipher.  Thoughts on what video codecs this might work with as well?

thanks,

-Josh
On Jul 18, 2013 3:42 AM, "Mark Murphy" <mmurphy at commonsware.com> wrote:

> On Wed, Jul 17, 2013 at 8:18 PM, Hans-Christoph Steiner
> <hans at guardianproject.info> wrote:
> > To make that MediaRecorder class work with IOCipher, there would need to
> be an
> > IOCipher version of that class, with all the java.io imports replaced by
> > info.guardianproject.iocipher imports, and the native code replaced with
> code
> > that can write to IOCipher, either Java or native.
>
> I suspect that this will be impractical, as most of the actual work
> should be done by the OS in StageFright (or the older OpenCORE) in a
> separate process.
>
> If you are willing to limit yourself to raw audio formats, you could
> have MediaRecorder record to one end of a ParcelFileDescriptor pipe,
> with you using the other end to write to IOCipher, at least in
> principle (haven't tried the IOCipher part). Here is a sample that
> demonstrates the rest:
>
>
> https://github.com/commonsguy/cw-omnibus/tree/master/Media/AudioRecordStream
>
> However, streams on pipes aren't rewindable, and so traditional audio
> and video codecs, where the file's header needs to be updated when
> recording is complete, will not work with this technique.
>
> --
> Mark Murphy (a Commons Guy)
> http://commonsware.com | http://github.com/commonsguy
> http://commonsware.com/blog | http://twitter.com/commonsguy
>
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