DATV demod: use ldpctool in Linux only

CMakeLists.txt

@@ -163,6 +163,7 @@ set(CUSTOM_WINDOWS_INCLUDE "${CMAKE_SOURCE_DIR}/custom/windows" CACHE INTERNAL "
 
 if(${CMAKE_SYSTEM_NAME} STREQUAL "Linux")
   set(LINUX TRUE)
+  add_definitions(-DLINUX)
   # populate distribution name
   # LSB_CODENAME will hold trusty for example
   find_program(LSB_RELEASE_EXECUTABLE lsb_release)

plugins/channelrx/demoddatv/CMakeLists.txt

@@ -19,11 +19,14 @@ set(datv_SOURCES
     leansdr/framework.cpp
     leansdr/math.cpp
     leansdr/sdr.cpp
-    ldpctool/tables_handler.cpp
     datvdemodgui.ui
     datvdvbs2ldpcdialog.ui
 )
 
+set(ldpc_SOURCES
+    ldpctool/tables_handler.cpp
+)
+
 set(datv_HEADERS
     datvdemod.h
     datvdemodgui.h
@@ -45,6 +48,9 @@ set(datv_HEADERS
     leansdr/framework.h
     leansdr/math.h
     leansdr/sdr.h
+)
+
+set(ldpc_HEADERS
     ldpctool/ldpc.h
     ldpctool/dvb_s2_tables.h
     ldpctool/dvb_s2x_tables.h
@@ -60,9 +66,16 @@ include_directories(
     ${CMAKE_SOURCE_DIR}/swagger/sdrangel/code/qt5/client
 )
 
-add_library(demoddatv SHARED
+if (LINUX)
+    add_library(demoddatv SHARED
         ${datv_SOURCES}
-)
+        ${ldpc_SOURCES}
+    )
+else()
+    add_library(demoddatv SHARED
+        ${datv_SOURCES}
+    )
+endif()
 
 target_link_libraries(demoddatv
     Qt5::Core
@@ -78,10 +91,12 @@ target_link_libraries(demoddatv
     ${SWRESAMPLE_LIBRARIES}
 )
 
-add_executable(ldpctool
+if (LINUX)
+    add_executable(ldpctool
         ldpctool/ldpc_tool.cpp
         ldpctool/tables_handler.cpp
-)
+    )
+    install(TARGETS ldpctool DESTINATION ${INSTALL_BIN_DIR})
+endif()
 
 install(TARGETS demoddatv DESTINATION ${INSTALL_PLUGINS_DIR})
-install(TARGETS ldpctool DESTINATION ${INSTALL_BIN_DIR})

plugins/channelrx/demoddatv/datvdemodgui.cpp

@@ -251,8 +251,13 @@ DATVDemodGUI::DATVDemodGUI(PluginAPI* objPluginAPI, DeviceUISet *deviceUISet, Ba
 	CRightClickEnabler *audioMuteRightClickEnabler = new CRightClickEnabler(ui->audioMute);
 	connect(audioMuteRightClickEnabler, SIGNAL(rightClick(const QPoint &)), this, SLOT(audioSelect()));
 
+#ifdef LINUX
     CRightClickEnabler *ldpcToolRightClickEnabler = new CRightClickEnabler(ui->softLDPC);
     connect(ldpcToolRightClickEnabler, SIGNAL(rightClick(const QPoint &)), this, SLOT(ldpcToolSelect()));
+#else
+    ui->softLDPC->setEnabled(false);
+    ui->softLDPC->setStyleSheet("QCheckBox { color: gray }");
+#endif
 
     resetToDefaults(); // does applySettings()
 }
@@ -294,13 +299,11 @@ void DATVDemodGUI::displaySettings()
         ui->chkHardMetric->setEnabled(true);
         ui->chkFastlock->setEnabled(true);
         ui->chkViterbi->setEnabled(true);
-        ui->softLDPC->setEnabled(false);
         ui->maxBitflips->setEnabled(false);
         ui->chkAllowDrift->setStyleSheet("QCheckBox { color: white }");
         ui->chkHardMetric->setStyleSheet("QCheckBox { color: white }");
         ui->chkFastlock->setStyleSheet("QCheckBox { color: white }");
         ui->chkViterbi->setStyleSheet("QCheckBox { color: white }");
-        ui->softLDPC->setStyleSheet("QCheckBox { color: gray }");
         ui->maxBitflips->setStyleSheet("QSpinBox { color: gray }");
         ui->maxBitflipsLabel->setStyleSheet("QLabel { color: gray }");
     }
@@ -310,17 +313,28 @@ void DATVDemodGUI::displaySettings()
         ui->chkHardMetric->setEnabled(false);
         ui->chkFastlock->setEnabled(false);
         ui->chkViterbi->setEnabled(false);
-        ui->softLDPC->setEnabled(true);
         ui->maxBitflips->setEnabled(true);
         ui->chkAllowDrift->setStyleSheet("QCheckBox { color: gray }");
         ui->chkHardMetric->setStyleSheet("QCheckBox { color: gray }");
         ui->chkFastlock->setStyleSheet("QCheckBox { color: gray }");
         ui->chkViterbi->setStyleSheet("QCheckBox { color: gray }");
-        ui->softLDPC->setStyleSheet("QCheckBox { color: white }");
         ui->maxBitflips->setStyleSheet("QSpinBox { color: white }");
         ui->maxBitflipsLabel->setStyleSheet("QLabel { color: white }");
     }
 
+#ifdef LINUX
+    if (m_settings.m_standard == DATVDemodSettings::dvb_version::DVB_S)
+    {
+        ui->softLDPC->setEnabled(false);
+        ui->softLDPC->setStyleSheet("QCheckBox { color: gray }");
+    }
+    else
+    {
+        ui->softLDPC->setEnabled(true);
+        ui->softLDPC->setStyleSheet("QCheckBox { color: white }");
+    }
+#endif
+
     if (m_settings.m_standard == DATVDemodSettings::dvb_version::DVB_S) {
         ui->statusText->clear();
     }
@@ -539,13 +553,11 @@ void DATVDemodGUI::on_cmbStandard_currentIndexChanged(int index)
         ui->chkHardMetric->setEnabled(true);
         ui->chkFastlock->setEnabled(true);
         ui->chkViterbi->setEnabled(true);
-        ui->softLDPC->setEnabled(false);
         ui->maxBitflips->setEnabled(false);
         ui->chkAllowDrift->setStyleSheet("QCheckBox { color: white }");
         ui->chkHardMetric->setStyleSheet("QCheckBox { color: white }");
         ui->chkFastlock->setStyleSheet("QCheckBox { color: white }");
         ui->chkViterbi->setStyleSheet("QCheckBox { color: white }");
-        ui->softLDPC->setStyleSheet("QCheckBox { color: gray }");
         ui->maxBitflips->setStyleSheet("QSpinBox { color: gray }");
         ui->maxBitflipsLabel->setStyleSheet("QLabel { color: gray }");
     }
@@ -555,17 +567,28 @@ void DATVDemodGUI::on_cmbStandard_currentIndexChanged(int index)
         ui->chkHardMetric->setEnabled(false);
         ui->chkFastlock->setEnabled(false);
         ui->chkViterbi->setEnabled(false);
-        ui->softLDPC->setEnabled(true);
         ui->maxBitflips->setEnabled(true);
         ui->chkAllowDrift->setStyleSheet("QCheckBox { color: gray }");
         ui->chkHardMetric->setStyleSheet("QCheckBox { color: gray }");
         ui->chkFastlock->setStyleSheet("QCheckBox { color: gray }");
         ui->chkViterbi->setStyleSheet("QCheckBox { color: gray }");
-        ui->softLDPC->setStyleSheet("QCheckBox { color: white }");
         ui->maxBitflips->setStyleSheet("QSpinBox { color: white }");
         ui->maxBitflipsLabel->setStyleSheet("QLabel { color: white }");
     }
 
+#ifdef LINUX
+    if (m_settings.m_standard == DATVDemodSettings::dvb_version::DVB_S)
+    {
+        ui->softLDPC->setEnabled(false);
+        ui->softLDPC->setStyleSheet("QCheckBox { color: gray }");
+    }
+    else
+    {
+        ui->softLDPC->setEnabled(true);
+        ui->softLDPC->setStyleSheet("QCheckBox { color: white }");
+    }
+#endif
+
     if (m_settings.m_standard == DATVDemodSettings::dvb_version::DVB_S) {
         ui->statusText->clear();
     }
@@ -603,8 +626,10 @@ void DATVDemodGUI::on_cmbFEC_currentIndexChanged(const QString &arg1)
 
 void DATVDemodGUI::on_softLDPC_clicked()
 {
+#ifdef LINUX
     m_settings.m_softLDPC = ui->softLDPC->isChecked();
     applySettings();
+#endif
 }
 
 void DATVDemodGUI::on_maxBitflips_valueChanged(int value)

plugins/channelrx/demoddatv/datvdemodsink.cpp

@@ -425,10 +425,12 @@ void DATVDemodSink::CleanUpDATVFramework(bool blnRelease)
             delete (leansdr::s2_fecdec<bool, leansdr::hard_sb>*) r_fecdec;
         }
 
+#ifdef LINUX
         if(r_fecdecsoft != nullptr)
         {
             delete (leansdr::s2_fecdec_soft<leansdr::llr_t,leansdr::llr_sb>*) r_fecdecsoft;
         }
+#endif
 
         if(p_deframer != nullptr)
         {
@@ -1140,6 +1142,7 @@ void DATVDemodSink::InitDATVS2Framework()
     p_vbitcount= new leansdr::pipebuf<int>(m_objScheduler, "Bits processed", BUF_S2PACKETS);
     p_verrcount = new leansdr::pipebuf<int>(m_objScheduler, "Bits corrected", BUF_S2PACKETS);
 
+#ifdef LINUX
     bool commandFileValid = false;
 
     if (QFileInfo::exists(m_settings.m_softLDPCToolPath))
@@ -1216,6 +1219,25 @@ void DATVDemodSink::InitDATVS2Framework()
         leansdr::s2_fecdec<bool, leansdr::hard_sb> *fecdec = (leansdr::s2_fecdec<bool, leansdr::hard_sb> * ) r_fecdec;
         fecdec->bitflips=m_settings.m_maxBitflips;
     }
+#else
+    // Bit-flipping mode.
+    // Deinterleave into hard bits.
+    p_fecframes = new leansdr::pipebuf< leansdr::fecframe<leansdr::hard_sb> >(m_objScheduler, "FEC frames", BUF_FRAMES);
+    p_s2_deinterleaver = new leansdr::s2_deinterleaver<leansdr::llr_ss,leansdr::hard_sb>(
+        m_objScheduler,
+        *(leansdr::pipebuf< leansdr::plslot<leansdr::llr_ss> > *) p_slots_dvbs2,
+        *(leansdr::pipebuf< leansdr::fecframe<leansdr::hard_sb> > * ) p_fecframes
+    );
+    r_fecdec =  new leansdr::s2_fecdec<bool, leansdr::hard_sb>(
+        m_objScheduler,
+        *(leansdr::pipebuf< leansdr::fecframe<leansdr::hard_sb> > * ) p_fecframes,
+        *(leansdr::pipebuf<leansdr::bbframe> *) p_bbframes,
+        p_vbitcount,
+        p_verrcount
+    );
+    leansdr::s2_fecdec<bool, leansdr::hard_sb> *fecdec = (leansdr::s2_fecdec<bool, leansdr::hard_sb> * ) r_fecdec;
+    fecdec->bitflips=m_settings.m_maxBitflips;
+#endif
 
     // Deframe BB frames to TS packets
     p_lock = new leansdr::pipebuf<int> (m_objScheduler, "lock", BUF_SLOW);

plugins/channelrx/demoddatv/leansdr/dvbs2.h

@@ -36,9 +36,11 @@
 #include "ldpc.h"
 #include "sdr.h"
 
+#ifdef LINUX
 #include "ldpctool/layered_decoder.h"
 #include "ldpctool/testbench.h"
 #include "ldpctool/algorithms.h"
+#endif
 
 namespace leansdr
 {
@@ -2174,6 +2176,8 @@ struct s2_fecdec : runnable
     pipewriter<int> *bitcount, *errcount;
 }; // s2_fecdec
 
+#ifdef LINUX
+
 // Soft LDPC decoder
 // Internally implemented LDPC tool. Replaces external LDPC decoder
 
@@ -2316,7 +2320,6 @@ private:
 
 // External LDPC decoder
 // Spawns a user-specified command, FEC frames on stdin/stdout.
-
 template <typename T, int _SIZE>
 struct simplequeue
 {
@@ -2620,6 +2623,7 @@ struct s2_fecdec_helper : runnable
     std::deque<int> errcount_q;
     pipewriter<int> *bitcount, *errcount;
 }; // s2_fecdec_helper
+#endif
 
 // S2 FRAMER
 // EN 302 307-1 section 5.1 Mode adaptation

plugins/channelrx/demoddatv/readme.md

@@ -165,7 +165,7 @@ The controls specific to DVB-S are disabled and greyed out. These are: Fast Lock
 
 <h5>B.2b.6: DVB-S2 specific - Soft LDPC decoder</h5>
 
-This is for experimenters only. It can be used to decode signals lower that ~10 db MER which is the limit of LDPC hard decoding as explained next (B.2b.7). Video degrades progressively down to about 7.5 dB MER and drops below this limit.
+This is for experimenters only working in Linux. It can be used to decode signals lower that ~10 db MER which is the limit of LDPC hard decoding as explained next (B.2b.7). Video degrades progressively down to about 7.5 dB MER and drops below this limit.
 
 Runs the `ldpctool` program for soft LDPC decoding. Frames are sent on its standard input and decoded frames retrieved from its standard output. Two processes executing `ldpctool` are spawned but so far it seems that only one is effectively used.