Hacker Guide/Demux
Description
The modules of 'demux' capability are designed to handle the different "file" formats. They usually come after the access in the modules chain.
Examples of demuxers are WMV/ASF, Ogg or Mkv.
Write an demuxer module
To write an demuxer module, read the introduction to module writing.
Then, you should specify your module of being of demux type:
set_capability( "demux", 60 ) set_category( CAT_INPUT ) set_subcategory( SUBCAT_INPUT_DEMUX )
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 include/vlc_demux.h, you should define:
- Demux, as in pf_demux
- Control, as in pf_control
After implementing those functions, you should assign them to the corresponding pf_ function.
Control
Prototype:
int (*pf_control)( access_t *, int i_query, va_list args);
Control function is quite easy, the input core will query the module using this function with:
- A pointer to the module structure.
- An i_query parameter that can be of several type. We will cover afterward the most important on.
- A list of arguments, that depends on the i_query type.
Return:
If the query has succeeded, it should return VLC_SUCCESS. Else it should return VLC_EGENERIC (fail).
Control Query types
Please read the Documentation Editing Guidelines before you edit the documentation
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