/* From packet-dvbci.c
read a utc_time field in an apdu and write it to utc_time
the encoding of the field is according to DVB-SI specification, section 5.2.5
16bit modified julian day (MJD), 24bit 6*4bit BCD digits hhmmss
return the length in bytes or -1 for error */
gint
packet_mpeg_sect_mjd_to_utc_time(tvbuff_t *tvb, gint offset, nstime_t *utc_time)
{
gint bcd_time_offset; /* start offset of the bcd time in the tvbuff */
guint8 hour, min, sec;
if (!utc_time)
return -1;
nstime_set_zero(utc_time);
utc_time->secs = (tvb_get_ntohs(tvb, offset) - 40587) * 86400;
bcd_time_offset = offset+2;
hour = MPEG_SECT_BCD44_TO_DEC(tvb_get_guint8(tvb, bcd_time_offset));
min = MPEG_SECT_BCD44_TO_DEC(tvb_get_guint8(tvb, bcd_time_offset+1));
sec = MPEG_SECT_BCD44_TO_DEC(tvb_get_guint8(tvb, bcd_time_offset+2));
if (hour>23 || min>59 || sec>59)
return -1;
utc_time->secs += hour*3600 + min*60 + sec;
return 5;
}
static void
dissect_dvb_eit(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
{
guint offset = 0, length = 0;
guint descriptor_len, descriptor_end;
guint16 evt_id;
proto_item *ti;
proto_tree *dvb_eit_tree;
proto_item *ei;
proto_tree *dvb_eit_event_tree;
proto_item *duration_item;
nstime_t start_time;
col_set_str(pinfo->cinfo, COL_INFO, "Event Information Table (EIT)");
ti = proto_tree_add_item(tree, proto_dvb_eit, tvb, offset, -1, ENC_NA);
dvb_eit_tree = proto_item_add_subtree(ti, ett_dvb_eit);
offset += packet_mpeg_sect_header(tvb, offset, dvb_eit_tree, &length, NULL);
length -= 4;
proto_tree_add_item(dvb_eit_tree, hf_dvb_eit_service_id, tvb, offset, 2, ENC_BIG_ENDIAN);
offset += 2;
proto_tree_add_item(dvb_eit_tree, hf_dvb_eit_reserved, tvb, offset, 1, ENC_BIG_ENDIAN);
proto_tree_add_item(dvb_eit_tree, hf_dvb_eit_version_number, tvb, offset, 1, ENC_BIG_ENDIAN);
proto_tree_add_item(dvb_eit_tree, hf_dvb_eit_current_next_indicator, tvb, offset, 1, ENC_BIG_ENDIAN);
offset += 1;
proto_tree_add_item(dvb_eit_tree, hf_dvb_eit_section_number, tvb, offset, 1, ENC_BIG_ENDIAN);
offset += 1;
proto_tree_add_item(dvb_eit_tree, hf_dvb_eit_last_section_number, tvb, offset, 1, ENC_BIG_ENDIAN);
offset += 1;
proto_tree_add_item(dvb_eit_tree, hf_dvb_eit_transport_stream_id, tvb, offset, 2, ENC_BIG_ENDIAN);
offset += 2;
proto_tree_add_item(dvb_eit_tree, hf_dvb_eit_original_network_id, tvb, offset, 2, ENC_BIG_ENDIAN);
offset += 2;
proto_tree_add_item(dvb_eit_tree, hf_dvb_eit_segment_last_section_number, tvb, offset, 1, ENC_BIG_ENDIAN);
offset += 1;
proto_tree_add_item(dvb_eit_tree, hf_dvb_eit_last_table_id, tvb, offset, 1, ENC_BIG_ENDIAN);
offset += 1;
if (offset >= length) {
packet_mpeg_sect_crc(tvb, pinfo, dvb_eit_tree, 0, offset);
return;
}
/* Parse all the events */
while (offset < length) {
evt_id = tvb_get_ntohs(tvb, offset);
ei = proto_tree_add_text(dvb_eit_tree, tvb, offset, 12, "Event 0x%04hx", evt_id);
dvb_eit_event_tree = proto_item_add_subtree(ei, ett_dvb_eit_event);
proto_tree_add_item(dvb_eit_event_tree, hf_dvb_eit_event_id, tvb, offset, 2, ENC_BIG_ENDIAN);
offset += 2;
if (tvb_memeql(tvb, offset, "\xFF\xFF\xFF\xFF\xFF", 5)) {
if (packet_mpeg_sect_mjd_to_utc_time(tvb, offset, &start_time) < 0) {
proto_tree_add_text(tree, tvb, offset, 5, "Unparseable time");
} else {
proto_tree_add_time_format(dvb_eit_event_tree, hf_dvb_eit_start_time, tvb, offset,
5, &start_time,
"Start Time: %s UTC", abs_time_to_str(&start_time, ABSOLUTE_TIME_UTC, FALSE));
}
} else {
proto_tree_add_text(tree, tvb, offset, 5, "Start Time: Undefined (0xFFFFFFFFFF)");
}
offset += 5;
duration_item = proto_tree_add_item(dvb_eit_event_tree, hf_dvb_eit_duration, tvb, offset, 3, ENC_BIG_ENDIAN);
proto_item_append_text(duration_item, " (%02u:%02u:%02u)",
MPEG_SECT_BCD44_TO_DEC(tvb_get_guint8(tvb, offset)),
MPEG_SECT_BCD44_TO_DEC(tvb_get_guint8(tvb, offset + 1)),
MPEG_SECT_BCD44_TO_DEC(tvb_get_guint8(tvb, offset + 2)));
offset += 3;
proto_tree_add_item(dvb_eit_event_tree, hf_dvb_eit_running_status, tvb, offset, 2, ENC_BIG_ENDIAN);
proto_tree_add_item(dvb_eit_event_tree, hf_dvb_eit_free_ca_mode, tvb, offset, 2, ENC_BIG_ENDIAN);
proto_tree_add_item(dvb_eit_event_tree, hf_dvb_eit_descriptors_loop_length, tvb, offset, 2, ENC_BIG_ENDIAN);
descriptor_len = tvb_get_ntohs(tvb, offset) & DVB_EIT_DESCRIPTORS_LOOP_LENGTH_MASK;
offset += 2;
descriptor_end = offset + descriptor_len;
while (offset < descriptor_end)
offset += proto_mpeg_descriptor_dissect(tvb, offset, dvb_eit_event_tree);
}
offset += packet_mpeg_sect_crc(tvb, pinfo, dvb_eit_tree, 0, offset);
proto_item_set_len(ti, offset);
}
