Add EDI timestamp offset configuration

3 files changed, 18 insertions, 4 deletions

diff --git a/doc/advanced.mux b/doc/advanced.mux
index 974df78..ab145fa 100644
--- a/doc/advanced.mux
+++ b/doc/advanced.mux
@@ -31,6 +31,11 @@ general {
     ; This also enables time encoding using the MNSC.
     tist false
 
+    ; On startup, EDI time is initialised to system time. If you want
+    ; to add an offset, uncomment the following line and give a number
+    ; in seconds.
+    ; tist_edioffset 0
+
     ; The management server is a simple TCP server that can present
     ; statistics data (buffers, overruns, underruns, etc)
     ; which can then be graphed a tool like Munin
diff --git a/src/DabMultiplexer.cpp b/src/DabMultiplexer.cpp
index 719e767..95a0cce 100644
--- a/src/DabMultiplexer.cpp
+++ b/src/DabMultiplexer.cpp
@@ -92,8 +92,8 @@ DabMultiplexer::DabMultiplexer(
     m_clock_tai(split_pipe_separated_string(pt.get("general.tai_clock_bulletins", ""))),
     fig_carousel(ensemble)
 {
-    RC_ADD_PARAMETER(frames,
-            "Show number of frames generated [read-only]");
+    RC_ADD_PARAMETER(frames, "Show number of frames generated [read-only]");
+    RC_ADD_PARAMETER(tist_edioffset, "EDI Time offset in seconds");
 
     rcs.enrol(&m_clock_tai);
 }
@@ -191,6 +191,7 @@ void DabMultiplexer::prepare(bool require_tai_clock)
     // Try to load offset once
 
     bool tist_enabled = m_pt.get("general.tist", false);
+    m_tist_edioffset = m_pt.get<int>("general.tist_edioffset", 0);
 
     m_tai_clock_required = (tist_enabled and edi_conf.enabled()) or require_tai_clock;
 
@@ -666,10 +667,11 @@ void DabMultiplexer::mux_frame(std::vector<std::shared_ptr<DabOutput> >& outputs
     edi_tagDETI.seconds = 0;
 #if HAVE_OUTPUT_EDI
     try {
-        bool tist_enabled = m_pt.get("general.tist", false);
+        const bool tist_enabled = m_pt.get("general.tist", false);
 
         if (tist_enabled and m_tai_clock_required) {
-            edi_tagDETI.set_seconds(edi_time);
+            edi_tagDETI.set_seconds(edi_time +
+                    std::chrono::seconds(m_tist_edioffset));
 
             // In case get_offset fails, we still want to update the EDI seconds
             const auto tai_utc_offset = m_clock_tai.get_offset();
@@ -863,6 +865,9 @@ void DabMultiplexer::set_parameter(const std::string& parameter,
             " is read-only";
         throw ParameterError(ss.str());
     }
+    else if (parameter == "tist_edioffset") {
+        m_tist_edioffset = std::stoi(value);
+    }
     else {
         stringstream ss;
         ss << "Parameter '" << parameter <<
@@ -878,6 +883,9 @@ const std::string DabMultiplexer::get_parameter(const std::string& parameter) co
     if (parameter == "frames") {
         ss << currentFrame;
     }
+    else if (parameter == "tist_edioffset") {
+        ss << m_tist_edioffset;
+    }
     else {
         ss << "Parameter '" << parameter <<
             "' is not exported by controllable " << get_rc_name();
diff --git a/src/DabMultiplexer.h b/src/DabMultiplexer.h
index 499e023..127ecfb 100644
--- a/src/DabMultiplexer.h
+++ b/src/DabMultiplexer.h
@@ -95,6 +95,7 @@ class DabMultiplexer : public RemoteControllable {
 
         std::shared_ptr<dabEnsemble> ensemble;
 
+        int m_tist_edioffset = 0;
         bool m_tai_clock_required;
         ClockTAI m_clock_tai;