aboutsummaryrefslogtreecommitdiffstats
path: root/src/fig/FIG0_20.cpp
diff options
context:
space:
mode:
Diffstat (limited to 'src/fig/FIG0_20.cpp')
-rw-r--r--src/fig/FIG0_20.cpp221
1 files changed, 221 insertions, 0 deletions
diff --git a/src/fig/FIG0_20.cpp b/src/fig/FIG0_20.cpp
new file mode 100644
index 0000000..86ac857
--- /dev/null
+++ b/src/fig/FIG0_20.cpp
@@ -0,0 +1,221 @@
+/*
+ Copyright (C) 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010,
+ 2011, 2012 Her Majesty the Queen in Right of Canada (Communications
+ Research Center Canada)
+
+ Copyright (C) 2024
+ Matthias P. Braendli, matthias.braendli@mpb.li
+ */
+/*
+ This file is part of ODR-DabMux.
+
+ ODR-DabMux is free software: you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as
+ published by the Free Software Foundation, either version 3 of the
+ License, or (at your option) any later version.
+
+ ODR-DabMux is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with ODR-DabMux. If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#include "fig/FIG0structs.h"
+#include "fig/FIG0_20.h"
+#include "utils.h"
+
+namespace FIC {
+
+// FIG 0/20 header structure for programme services (16-bit SId)
+struct FIGtype0_20_programme_header {
+ uint8_t SId_high;
+ uint8_t SId_low;
+ uint8_t sc_flag:1;
+ uint8_t pt_flag:1;
+ uint8_t change_flags:2;
+ uint8_t SCIdS:4;
+} PACKED;
+
+// FIG 0/20 header structure for data services (32-bit SId)
+struct FIGtype0_20_data_header {
+ uint8_t SId_byte0;
+ uint8_t SId_byte1;
+ uint8_t SId_byte2;
+ uint8_t SId_byte3;
+ uint8_t sc_flag:1;
+ uint8_t pt_flag:1;
+ uint8_t change_flags:2;
+ uint8_t SCIdS:4;
+} PACKED;
+
+// SC description structure (1 byte, only present if SC flag = 1)
+struct FIGtype0_20_sc_desc {
+ uint8_t SCTy:6;
+ uint8_t ad_flag:1;
+ uint8_t ca_flag:1;
+} PACKED;
+
+FIG0_20::FIG0_20(FIGRuntimeInformation *rti) :
+ m_rti(rti),
+ m_initialised(false)
+{ }
+
+FillStatus FIG0_20::fill(uint8_t *buf, size_t max_size)
+{
+ FillStatus fs;
+ ssize_t remaining = max_size;
+
+ auto ensemble = m_rti->ensemble;
+
+ if (ensemble->sci_entries.empty()) {
+ fs.complete_fig_transmitted = true;
+ fs.num_bytes_written = 0;
+ return fs;
+ }
+
+ if (not m_initialised) {
+ sci_it = ensemble->sci_entries.end();
+ m_initialised = true;
+ }
+
+ FIGtype0* fig0 = NULL;
+
+ for (; sci_it != ensemble->sci_entries.end(); ++sci_it) {
+ auto& sci = *sci_it;
+
+ if (!sci->is_active()) {
+ continue;
+ }
+
+ // Calculate required size for this SCI entry
+ size_t required_size = 0;
+
+ if (sci->isProgramme) {
+ required_size += 3; // 2 bytes SId + 1 byte flags
+ } else {
+ required_size += 5; // 4 bytes SId + 1 byte flags
+ }
+
+ if (sci->sc_flag) {
+ required_size += 1;
+ }
+
+ // Date-time field: 3 bytes
+ required_size += 3;
+
+ // Transfer SId
+ if (sci->sid_flag) {
+ required_size += sci->isProgramme ? 2 : 4;
+ }
+
+ // Transfer EId
+ if (sci->eid_flag) {
+ required_size += 2;
+ }
+
+ if (fig0 == NULL) {
+ if (remaining < 2 + (ssize_t)required_size) {
+ break;
+ }
+
+ fig0 = (FIGtype0*)buf;
+ fig0->FIGtypeNumber = 0;
+ fig0->Length = 1;
+ fig0->CN = 0;
+ fig0->OE = 0;
+ fig0->PD = sci->isProgramme ? 0 : 1;
+ fig0->Extension = 20;
+
+ buf += 2;
+ remaining -= 2;
+ }
+ else if (remaining < (ssize_t)required_size) {
+ break;
+ }
+
+ uint8_t* entry_start = buf;
+
+ if (sci->isProgramme) {
+ auto header = (FIGtype0_20_programme_header*)buf;
+ header->SId_high = (sci->SId >> 8) & 0xFF;
+ header->SId_low = sci->SId & 0xFF;
+ header->SCIdS = sci->SCIdS & 0x0F;
+ header->change_flags = static_cast<uint8_t>(sci->change_flags) & 0x03;
+ header->pt_flag = sci->part_time ? 1 : 0;
+ header->sc_flag = sci->sc_flag ? 1 : 0;
+ buf += 3;
+ }
+ else {
+ auto header = (FIGtype0_20_data_header*)buf;
+ header->SId_byte0 = (sci->SId >> 24) & 0xFF;
+ header->SId_byte1 = (sci->SId >> 16) & 0xFF;
+ header->SId_byte2 = (sci->SId >> 8) & 0xFF;
+ header->SId_byte3 = sci->SId & 0xFF;
+ header->SCIdS = sci->SCIdS & 0x0F;
+ header->change_flags = static_cast<uint8_t>(sci->change_flags) & 0x03;
+ header->pt_flag = sci->part_time ? 1 : 0;
+ header->sc_flag = sci->sc_flag ? 1 : 0;
+ buf += 5;
+ }
+
+ if (sci->sc_flag) {
+ auto sc_desc = (FIGtype0_20_sc_desc*)buf;
+ sc_desc->ca_flag = sci->ca_flag ? 1 : 0;
+ sc_desc->ad_flag = sci->ad_flag ? 1 : 0;
+ sc_desc->SCTy = sci->SCTy & 0x3F;
+ buf += 1;
+ }
+
+ // Date-time field (3 bytes)
+ // Byte 0: date[4:0] + hour[4:2]
+ // Byte 1: hour[1:0] + minute[5:0]
+ // Byte 2: second[5:0] + sid_flag + eid_flag
+ uint8_t date_val = sci->date & 0x1F;
+ uint8_t hour_val = sci->hour & 0x1F;
+ uint8_t minute_val = sci->minute & 0x3F;
+ uint8_t second_val = sci->second & 0x3F;
+
+ buf[0] = (date_val << 3) | (hour_val >> 2);
+ buf[1] = ((hour_val & 0x03) << 6) | minute_val;
+ buf[2] = (second_val << 2) | ((sci->sid_flag ? 1 : 0) << 1) | (sci->eid_flag ? 1 : 0);
+ buf += 3;
+
+ if (sci->sid_flag) {
+ if (sci->isProgramme) {
+ buf[0] = (sci->transfer_sid >> 8) & 0xFF;
+ buf[1] = sci->transfer_sid & 0xFF;
+ buf += 2;
+ }
+ else {
+ buf[0] = (sci->transfer_sid >> 24) & 0xFF;
+ buf[1] = (sci->transfer_sid >> 16) & 0xFF;
+ buf[2] = (sci->transfer_sid >> 8) & 0xFF;
+ buf[3] = sci->transfer_sid & 0xFF;
+ buf += 4;
+ }
+ }
+
+ if (sci->eid_flag) {
+ buf[0] = (sci->transfer_eid >> 8) & 0xFF;
+ buf[1] = sci->transfer_eid & 0xFF;
+ buf += 2;
+ }
+
+ size_t entry_size = buf - entry_start;
+ fig0->Length += entry_size;
+ remaining -= entry_size;
+ }
+
+ if (sci_it == ensemble->sci_entries.end()) {
+ sci_it = ensemble->sci_entries.begin();
+ fs.complete_fig_transmitted = true;
+ }
+
+ fs.num_bytes_written = max_size - remaining;
+ return fs;
+}
+
+}
generated by cgit v1.2.3 (git 2.46.0) at 2026-02-06 08:17:30 +0000