* mpeg/psi.h: Fix a segfault when the number of sections changes. * mpeg/psi.h, dvb/si.h: Add functions to validate if there is enough space for a new substructure. * dvb/si.h: Add support for DVB MJD format. * dvb/si.h: Correctly initialize a byte in SDT sub-structure. * dvb/si.h: Fully implement descriptor 0x48 (service descriptor).