Hacker Guide/Access Demux
An access-demuxer could be seen as a demuxer that handles the access at the same time.
In an access-demuxer, the stream s is null.
Examples of access-demuxer are DVD, Bluray, v4l2 modules.
Write an access-demux module
To write an access_demuxer module, start by reading the introduction to module writing.
Then, you should specify your module of being of access_demux type:
set_capability( "access_demux", 60 ) set_category( CAT_INPUT ) set_subcategory( SUBCAT_INPUT_ACCESS )
Functions to implement
After implementing Open() and Close() functions, you will need to implement a few majors features that will be implemented by your functions.
As you can see in demux, you should define:
- Demux, as in pf_demux
- Control, as in pf_control NB: please refer to demux Control documentation
After implementing those functions, you should assign them to the corresponding pf_ function.
Demux in access_demux is a bit different than in a demux module, because all the seeking and access of the stream is internal to the module.
int (*pf_demux) ( demux_t * );
It should return 0 for EOF, something positive when success and something negative when fail to demux.
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