[vlc-devel] Append metadata to block_t

Vladimir Davydov davydov.vladimir at gmail.com
Fri Jul 13 14:25:22 CEST 2018

Hi Francois, 
Thank  you for fast response.
Please see my comments below.

> Le 13/07/2018 à 13:44, Vladimir Davydov a écrit :
> > Hello dear VLC developers,
> > 
> > 
> > I have analyzed the code of other modules but didn't find good solution.
> > What is the usual way to resolve problem like this?
> > 
> > One of the ways I see is to append metadata at the begin of p_buffer
> > (before media sample payload) and set some new flag to i_flags.  But it
> > requires adding of new global flag like BLOCK_FLAG_CENC_ENCRYPTED.
> > Something like adding to vlc_block.h :
> > #define BLOCK_FLAG_CENC_ENCRYPTED 0x4000
> > That is not good because flags range is pretty limited.
> > 
> > Do you have any better ideas to implement it?
> Sample encryption support is already planned.
> IV pass isn't sufficient as some encryption methods provide IV per
> sample, or segment.

Yes, I have meant this case when each sample has own IV.

> You'll need to configure decryption on es using ES control (decryption
> modules will be handled before decoder), and provide per sample parameters.

Do you mean separate module which decrypts samples and passes it to decoder 

> See the discussion about ancillary.

Could you please point me to this discussion?
Does this mailing list have web search functionality? I didn't find it.


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