* Add a dispatcher method for tracklist properties
 * Implement Tracks and CanEditTracks

restricted to the audio and video filters.

This happen when p_vids->p_bih->biSize - sizeof( BITMAPINFOHEADER ) = 0
and the data is in p_vids->i_chunk_size, because then p_extra == NULL.

This solves the fruity sample crash but doesn't fix the palette

Signed-off-by: Jean-Baptiste Kempf <jb@videolan.org>

It allows to give them a category (vout display).

The code is based on CheckAPI from egl.c

It is more compatible than to use glXGetProcAddress() which is not always
present (need opengl >= 1.4).

It avoids tearing.

Signed-off-by: Jean-Baptiste Kempf <jb@videolan.org>

Otherwise Qt4 selects another value by default and fails.