Hacker Guide/Demux
Contents
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
Demux
Prototype:
int (*pf_demux) ( demux_t * );
Demux function is quite easy, it pulls data from s* the pointer to the stream_t.
Return:
It should return 0 for EOF, something positive when success and something negative when fail to demux.
Please read the Documentation Editing Guidelines before you edit the documentation
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