The fixed warnings are:
  bitstream/dvb/sim.h: In function "tlv_find_data":
  bitstream/dvb/sim.h:216:5: warning: return discards qualifiers from pointer target type

  bitstream/dvb/sim.h: In function "ecmg_validate":
  bitstream/dvb/sim.h:389:5: warning: excess elements in scalar initializer
  bitstream/dvb/sim.h:389:5: warning: (near initialization for "p_param")
  bitstream/dvb/sim.h:389:5: warning: excess elements in scalar initializer
  bitstream/dvb/sim.h:389:5: warning: (near initialization for "p_param")

  bitstream/dvb/si.h: In function "dvb_string_set":
  bitstream/dvb/si.h:174:9: warning: pointer targets in passing argument 1 of "strlen" differ in signedness
  /usr/include/string.h:399:15: note: expected "const char *" but argument is of type "const uint8_t *"

  bitstream/dvb/si.h:174:9: warning: pointer targets in passing argument 1 of "__strdup" differ in signedness
  /usr/include/bits/string2.h:1303:14: note: expected "const char *" but argument is of type "const uint8_t *"
  bitstream/dvb/si.h:174:9: warning: pointer targets in return differ in signedness

  bitstream/dvb/si.h: In function "dvb_string_get":
  bitstream/dvb/si.h:219:25: warning: passing argument 3 of "pf_iconv" discards qualifiers from pointer target type
  bitstream/dvb/si.h:219:25: note: expected "char *" but argument is of type "const uint8_t *"

  bitstream/dvb/si.h: In function "desc48_get_service":
  bitstream/dvb/si.h:742:5: warning: return discards qualifiers from pointer target type