[vlc-devel] Block access/demux?
fenrir at via.ecp.fr
Fri Jul 20 21:13:13 CEST 2007
On Fri, Jul 20, 2007, Rémi Denis-Courmont wrote:
> Is there a way a demux can pick blocks from the input stream so that
> they retain the same boundaries as those coming from the (block)
> access? Using stream_Block does not seem to work (blocks are merged).
No there is no way.
> That's problematic if the mux format uses block boundaries from lower
> Also, is it normal that stream_t.pf_block is just always under any
> circumstances, NULL ??
Yes, pf_block is a left over from stream_t design, it was there for
reading block with their natural boundaries. But later I changed
stream_Block to read arbitrary block size.
Such block reading was not usefull anymore with the concept of
access_demux_t (at least at that time).
What exactly is your situation ?
In the case the demux need the block boundaries from the access, it
means the demuxer and the access are really bound to each other, and thus
an access_demux_t may be the best solution.
If you can reuse an existing access (the only one I see is udp) it is easy
to implement an access_demux_t that instantiate such access for itself (bypassing
If it isn't possible or too complicated to use access_demux I could modify
stream_Block to allow it (like using zero/negative size). But it might be tricky
to make stream_Read/Seek coexist with that.
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