Added support for DVB devices with more than one frontend that all use the same dvr and demux

1 files changed, 219 insertions, 82 deletions

diff --git a/dvbdevice.c b/dvbdevice.c
index 8710e775..701d6f9d 100644
--- a/dvbdevice.c
+++ b/dvbdevice.c
@@ -4,7 +4,7 @@
  * See the main source file 'vdr.c' for copyright information and
  * how to reach the author.
  *
- * $Id: dvbdevice.c 4.16 2018/02/15 15:37:01 kls Exp $
+ * $Id: dvbdevice.c 4.17 2018/10/29 10:40:34 kls Exp $
  */
 
 #include "dvbdevice.h"
@@ -293,6 +293,90 @@ bool cDvbTransponderParameters::Parse(const char *s)
   return true;
 }
 
+// --- cDvbFrontend ----------------------------------------------------------
+
+class cDvbFrontend {
+private:
+  int adapter, frontend;
+  int fd_frontend;
+  uint32_t subsystemId;
+  dvb_frontend_info frontendInfo;
+  cVector<int> deliverySystems;
+  int numModulations;
+  bool QueryDeliverySystems(void);
+public:
+  cDvbFrontend(int Adapter, int Frontend);
+  ~cDvbFrontend();
+  int Open(void);
+  void Close(void);
+  const char *FrontendName(void) { return frontendInfo.name; }
+  bool ProvidesDeliverySystem(int DeliverySystem) const;
+  bool ProvidesModulation(int System, int StreamId, int Modulation) const;
+  int NumDeliverySystems(void) const { return deliverySystems.Size(); }
+  int NumModulations(void) const { return numModulations; }
+  uint32_t SubsystemId(void) const { return subsystemId; }
+  };
+
+cDvbFrontend::cDvbFrontend(int Adapter, int Frontend)
+{
+  adapter = Adapter;
+  frontend = Frontend;
+  fd_frontend = -1;
+  subsystemId = cDvbDeviceProbe::GetSubsystemId(adapter, frontend);
+  numModulations = 0;
+  Open();
+  QueryDeliverySystems();
+  Close();
+}
+
+cDvbFrontend::~cDvbFrontend()
+{
+  Close();
+}
+
+int cDvbFrontend::Open(void)
+{
+  Close();
+  fd_frontend = DvbOpen(DEV_DVB_FRONTEND, adapter, frontend, O_RDWR | O_NONBLOCK, true);
+  return fd_frontend;
+}
+
+void cDvbFrontend::Close(void)
+{
+  if (fd_frontend >= 0) {
+     if (close(fd_frontend) != 0)
+        esyslog("ERROR: frontend %d/%d", adapter, frontend);
+     fd_frontend = -1;
+     }
+}
+
+bool cDvbFrontend::ProvidesDeliverySystem(int DeliverySystem) const
+{
+  for (int i = 0; i < deliverySystems.Size(); i++) {
+      if (deliverySystems[i] == DeliverySystem)
+         return true;
+      }
+  return false;
+}
+
+bool cDvbFrontend::ProvidesModulation(int System, int StreamId, int Modulation) const
+{
+  if (StreamId != 0 && !(frontendInfo.caps & FE_CAN_MULTISTREAM))
+     return false;
+  if (Modulation == QPSK     && !(frontendInfo.caps & FE_CAN_QPSK) ||
+      Modulation == QAM_16   && !(frontendInfo.caps & FE_CAN_QAM_16) ||
+      Modulation == QAM_32   && !(frontendInfo.caps & FE_CAN_QAM_32) ||
+      Modulation == QAM_64   && !(frontendInfo.caps & FE_CAN_QAM_64) ||
+      Modulation == QAM_128  && !(frontendInfo.caps & FE_CAN_QAM_128) ||
+      Modulation == QAM_256  && !(frontendInfo.caps & FE_CAN_QAM_256) ||
+      Modulation == QAM_AUTO && !(frontendInfo.caps & FE_CAN_QAM_AUTO) ||
+      Modulation == VSB_8    && !(frontendInfo.caps & FE_CAN_8VSB) ||
+      Modulation == VSB_16   && !(frontendInfo.caps & FE_CAN_16VSB) ||
+      Modulation == PSK_8    && !(frontendInfo.caps & FE_CAN_TURBO_FEC) && System == SYS_DVBS) // "turbo fec" is a non standard FEC used by North American broadcasters - this is a best guess to de
+     return false;
+  return true;
+}
+
 // --- cDvbTuner -------------------------------------------------------------
 
 #define TUNER_POLL_TIMEOUT  10 // ms
@@ -303,9 +387,13 @@ private:
   enum eTunerStatus { tsIdle, tsSet, tsPositioning, tsTuned, tsLocked };
   int frontendType;
   const cDvbDevice *device;
-  int fd_frontend;
-  int adapter, frontend;
-  uint32_t subsystemId;
+  mutable int fd_frontend;
+  int adapter;
+  mutable int frontend;
+  cVector<cDvbFrontend *> dvbFrontends;
+  mutable cDvbFrontend *dvbFrontend;
+  int numDeliverySystems;
+  int numModulations;
   int tuneTimeout;
   int lockTimeout;
   time_t lastTimeoutReport;
@@ -320,7 +408,7 @@ private:
   const cScr *scr;
   bool lnbPowerTurnedOn;
   eTunerStatus tunerStatus;
-  cMutex mutex;
+  mutable cMutex mutex;
   cCondVar locked;
   cCondVar newSet;
   cDvbTuner *bondedTuner;
@@ -337,14 +425,19 @@ private:
   bool SetFrontend(void);
   virtual void Action(void);
 public:
-  cDvbTuner(const cDvbDevice *Device, int Fd_Frontend, int Adapter, int Frontend);
+  cDvbTuner(const cDvbDevice *Device, int Adapter, int Frontend);
   virtual ~cDvbTuner();
+  bool ProvidesDeliverySystem(int DeliverySystem) const;
+  bool ProvidesModulation(int System, int StreamId, int Modulation) const;
+  bool ProvidesFrontend(const cChannel *Channel, bool Activate = false) const;
   int FrontendType(void) const { return frontendType; }
+  const char *FrontendName(void) { return dvbFrontend->FrontendName(); }
+  int NumProvidedSystems(void) const { return numDeliverySystems + numModulations; }
   bool Bond(cDvbTuner *Tuner);
   void UnBond(void);
   bool BondingOk(const cChannel *Channel, bool ConsiderOccupied = false) const;
   const cChannel *GetTransponder(void) const { return &channel; }
-  uint32_t SubsystemId(void) const { return subsystemId; }
+  uint32_t SubsystemId(void) const { return dvbFrontend->SubsystemId(); }
   bool IsTunedTo(const cChannel *Channel) const;
   void SetChannel(const cChannel *Channel);
   bool Locked(int TimeoutMs = 0);
@@ -356,14 +449,14 @@ public:
 
 cMutex cDvbTuner::bondMutex;
 
-cDvbTuner::cDvbTuner(const cDvbDevice *Device, int Fd_Frontend, int Adapter, int Frontend)
+cDvbTuner::cDvbTuner(const cDvbDevice *Device, int Adapter, int Frontend)
 {
   frontendType = SYS_UNDEFINED;
   device = Device;
-  fd_frontend = Fd_Frontend;
+  fd_frontend = -1;
   adapter = Adapter;
   frontend = Frontend;
-  subsystemId = cDvbDeviceProbe::GetSubsystemId(adapter, frontend);
+  dvbFrontend = NULL;
   tuneTimeout = 0;
   lockTimeout = 0;
   lastTimeoutReport = 0;
@@ -379,7 +472,31 @@ cDvbTuner::cDvbTuner(const cDvbDevice *Device, int Fd_Frontend, int Adapter, int
   tunerStatus = tsIdle;
   bondedTuner = NULL;
   bondedMaster = false;
-  SetDescription("frontend %d/%d tuner", adapter, frontend);
+  cDvbFrontend *fe = new cDvbFrontend(adapter, frontend);
+  dvbFrontends.Append(fe);
+  numDeliverySystems = fe->NumDeliverySystems();
+  numModulations = fe->NumModulations();
+  cString FrontendNumbers = cString::sprintf("%d", frontend);
+  // Check for multiple frontends:
+  if (frontend == 0) {
+     for (int i = 1; ; i++) {
+         if (access(DvbName(DEV_DVB_FRONTEND, adapter, i), F_OK) == 0) {
+            if (access(DvbName(DEV_DVB_DEMUX, adapter, i), F_OK) != 0) {
+               fe = new cDvbFrontend(adapter, i);
+               dvbFrontends.Append(fe);
+               numDeliverySystems += fe->NumDeliverySystems();
+               //numModulations += fe->NumModulations(); // looks like in multi frontend devices all frontends report the same modulations
+               FrontendNumbers = cString::sprintf("%s+%d", *FrontendNumbers, i);
+               }
+            }
+         else
+            break;
+         }
+     }
+  // Open default frontend:
+  dvbFrontend = dvbFrontends[0];
+  fd_frontend = dvbFrontend->Open();
+  SetDescription("frontend %d/%s tuner", adapter, *FrontendNumbers);
   Start();
 }
 
@@ -396,6 +513,51 @@ cDvbTuner::~cDvbTuner()
      ExecuteDiseqc(lastDiseqc, &Frequency);
      }
   */
+  for (int i = 0; i < dvbFrontends.Size(); i++)
+      delete dvbFrontends[i];
+}
+
+bool cDvbTuner::ProvidesDeliverySystem(int DeliverySystem) const
+{
+  for (int i = 0; i < dvbFrontends.Size(); i++) {
+      if (dvbFrontends[i]->ProvidesDeliverySystem(DeliverySystem))
+         return true;
+      }
+  return false;
+}
+
+bool cDvbTuner::ProvidesModulation(int System, int StreamId, int Modulation) const
+{
+  for (int i = 0; i < dvbFrontends.Size(); i++) {
+      if (dvbFrontends[i]->ProvidesModulation(System, StreamId, Modulation))
+         return true;
+      }
+  return false;
+}
+
+static int GetRequiredDeliverySystem(const cChannel *Channel, const cDvbTransponderParameters *Dtp);//TODO
+
+bool cDvbTuner::ProvidesFrontend(const cChannel *Channel, bool Activate) const
+{
+  cDvbTransponderParameters dtp(Channel->Parameters());
+  int DeliverySystem = GetRequiredDeliverySystem(Channel, &dtp);
+  for (int i = 0; i < dvbFrontends.Size(); i++) {
+      if (dvbFrontends[i]->ProvidesDeliverySystem(DeliverySystem) && dvbFrontends[i]->ProvidesModulation(dtp.System(), dtp.StreamId(), dtp.Modulation())) {
+         if (Activate && dvbFrontend != dvbFrontends[i]) {
+            cMutexLock MutexLock(&mutex);
+            dvbFrontend->Close();
+            dvbFrontend = dvbFrontends[i];
+            fd_frontend = dvbFrontend->Open();
+            frontend = i;
+            dsyslog("using frontend %d/%d", adapter, frontend);
+            lastUncValue = 0;
+            lastUncDelta = 0;
+            lastUncChange = 0;
+            }
+         return true;
+         }
+      }
+  return false;
 }
 
 bool cDvbTuner::Bond(cDvbTuner *Tuner)
@@ -585,7 +747,7 @@ bool cDvbTuner::GetSignalStats(int &Valid, double *Strength, double *Cnr, double
   CmdSeq.props = Props;
   Valid = DTV_STAT_VALID_NONE;
   if (ioctl(fd_frontend, FE_READ_STATUS, &FeStatus) != 0) {
-     esyslog("ERROR: frontend %d/%d: %m", adapter, frontend);
+     esyslog("ERROR: frontend %d/%d: %m (%s:%d)", adapter, frontend, __FILE__, __LINE__);
      return false;
      }
   if (Status) {
@@ -606,7 +768,7 @@ bool cDvbTuner::GetSignalStats(int &Valid, double *Strength, double *Cnr, double
   if (Per)      { SETCMD(DTV_STAT_ERROR_BLOCK_COUNT, 0);
                   SETCMD(DTV_STAT_TOTAL_BLOCK_COUNT, 0); }
   if (ioctl(fd_frontend, FE_GET_PROPERTY, &CmdSeq) != 0) {
-     esyslog("ERROR: frontend %d/%d: %m", adapter, frontend);
+     esyslog("ERROR: frontend %d/%d: %m (%s:%d)", adapter, frontend, __FILE__, __LINE__);
      return false;
      }
   int i = 0;
@@ -939,7 +1101,7 @@ int cDvbTuner::GetSignalStrength(void) const
       SETCMD(DTV_CODE_RATE_HP, 0); // DVB-T only
       SETCMD(DTV_INNER_FEC, 0);
       if (ioctl(fd_frontend, FE_GET_PROPERTY, &CmdSeq) != 0) {
-         esyslog("ERROR: frontend %d/%d: %m", adapter, frontend);
+         esyslog("ERROR: frontend %d/%d: %m (%s:%d)", adapter, frontend, __FILE__, __LINE__);
          return -1;
          }
       int FeMod = (Props[1].u.st.len > 0) ? (int)Props[1].u.data : -1;
@@ -973,7 +1135,7 @@ int cDvbTuner::GetSignalStrength(void) const
   uint16_t MaxSignal = 0xFFFF; // Let's assume the default is using the entire range.
   // Use the subsystemId to identify individual devices in case they need
   // special treatment to map their Signal value into the range 0...0xFFFF.
-  switch (subsystemId) {
+  switch (dvbFrontend->SubsystemId()) {
     case 0x13C21019: // TT-budget S2-3200 (DVB-S/DVB-S2)
     case 0x1AE40001: // TechniSat SkyStar HD2 (DVB-S/DVB-S2)
                      MaxSignal = 670; break;
@@ -982,7 +1144,7 @@ int cDvbTuner::GetSignalStrength(void) const
   if (s > 100)
      s = 100;
 #ifdef DEBUG_SIGNALSTRENGTH
-  fprintf(stderr, "FE %d/%d: API3 %08X S = %04X %04X %3d%%\n", adapter, frontend, subsystemId, MaxSignal, Signal, s);
+  fprintf(stderr, "FE %d/%d: API3 %08X S = %04X %04X %3d%%\n", adapter, frontend, dvbFrontend->SubsystemId(), MaxSignal, Signal, s);
 #endif
   return s;
 }
@@ -1005,7 +1167,7 @@ int cDvbTuner::GetSignalQuality(void) const
       SETCMD(DTV_STAT_POST_ERROR_BIT_COUNT, 0);
       SETCMD(DTV_STAT_POST_TOTAL_BIT_COUNT, 0);
       if (ioctl(fd_frontend, FE_GET_PROPERTY, &CmdSeq) != 0) {
-         esyslog("ERROR: frontend %d/%d: %m", adapter, frontend);
+         esyslog("ERROR: frontend %d/%d: %m (%s:%d)", adapter, frontend, __FILE__, __LINE__);
          return -1;
          }
       int FeMod = (Props[1].u.st.len > 0) ? (int)Props[1].u.data : -1;
@@ -1132,7 +1294,7 @@ int cDvbTuner::GetSignalQuality(void) const
      uint16_t MaxSnr = 0xFFFF; // Let's assume the default is using the entire range.
      // Use the subsystemId to identify individual devices in case they need
      // special treatment to map their Snr value into the range 0...0xFFFF.
-     switch (subsystemId) {
+     switch (dvbFrontend->SubsystemId()) {
        case 0x13C21019: // TT-budget S2-3200 (DVB-S/DVB-S2)
        case 0x1AE40001: // TechniSat SkyStar HD2 (DVB-S/DVB-S2)
                         if (frontendType == SYS_DVBS2) {
@@ -1154,7 +1316,7 @@ int cDvbTuner::GetSignalQuality(void) const
      if (q > 100)
         q = 100;
 #ifdef DEBUG_SIGNALQUALITY
-     fprintf(stderr, "FE %d/%d: API3 %08X Q = %04X %04X %d %5d %5d %3d%%\n", adapter, frontend, subsystemId, MaxSnr, Snr, HasSnr, HasBer ? int(Ber) : -1, HasUnc ? int(Unc) : -1, q);
+     fprintf(stderr, "FE %d/%d: API3 %08X Q = %04X %04X %d %5d %5d %3d%%\n", adapter, frontend, dvbFrontend->SubsystemId(), MaxSnr, Snr, HasSnr, HasBer ? int(Ber) : -1, HasUnc ? int(Unc) : -1, q);
 #endif
      return q;
      }
@@ -1265,7 +1427,7 @@ bool cDvbTuner::SetFrontend(void)
   CmdSeq.props = Props;
   SETCMD(DTV_CLEAR, 0);
   if (ioctl(fd_frontend, FE_SET_PROPERTY, &CmdSeq) < 0) {
-     esyslog("ERROR: frontend %d/%d: %m", adapter, frontend);
+     esyslog("ERROR: frontend %d/%d: %m (%s:%d)", adapter, frontend, __FILE__, __LINE__);
      return false;
      }
   CmdSeq.num = 0;
@@ -1390,7 +1552,7 @@ bool cDvbTuner::SetFrontend(void)
      }
   SETCMD(DTV_TUNE, 0);
   if (ioctl(fd_frontend, FE_SET_PROPERTY, &CmdSeq) < 0) {
-     esyslog("ERROR: frontend %d/%d: %m", adapter, frontend);
+     esyslog("ERROR: frontend %d/%d: %m (%s:%d)", adapter, frontend, __FILE__, __LINE__);
      return false;
      }
   return true;
@@ -1402,11 +1564,11 @@ void cDvbTuner::Action(void)
   bool LostLock = false;
   fe_status_t Status = (fe_status_t)0;
   while (Running()) {
+        int WaitTime = 1000;
         fe_status_t NewStatus;
         if (GetFrontendStatus(NewStatus))
            Status = NewStatus;
         cMutexLock MutexLock(&mutex);
-        int WaitTime = 1000;
         switch (tunerStatus) {
           case tsIdle:
                break; // we want the TimedWait() below!
@@ -1542,7 +1704,7 @@ int cDvbDevice::setTransferModeForDolbyDigital = 1;
 cMutex cDvbDevice::bondMutex;
 
 const char *DeliverySystemNames[] = {
-  "",
+  "???",
   "DVB-C",
   "DVB-C",
   "DVB-T",
@@ -1580,16 +1742,10 @@ cDvbDevice::cDvbDevice(int Adapter, int Frontend)
   frontend = Frontend;
   ciAdapter = NULL;
   dvbTuner = NULL;
-  numDeliverySystems = 0;
-  numModulations = 0;
   bondedDevice = NULL;
   needsDetachBondedReceivers = false;
   tsBuffer = NULL;
 
-  // Devices that are present on all card types:
-
-  int fd_frontend = DvbOpen(DEV_DVB_FRONTEND, adapter, frontend, O_RDWR | O_NONBLOCK);
-
   // Common Interface:
 
   fd_ca = DvbOpen(DEV_DVB_CA, adapter, frontend, O_RDWR);
@@ -1603,12 +1759,7 @@ cDvbDevice::cDvbDevice(int Adapter, int Frontend)
 
   // We only check the devices that must be present - the others will be checked before accessing them://XXX
 
-  if (fd_frontend >= 0) {
-     if (QueryDeliverySystems(fd_frontend))
-        dvbTuner = new cDvbTuner(this, fd_frontend, adapter, frontend);
-     }
-  else
-     esyslog("ERROR: can't open DVB device %d/%d", adapter, frontend);
+  dvbTuner = new cDvbTuner(this, adapter, frontend);
 
   StartSectionHandler();
 }
@@ -1623,12 +1774,12 @@ cDvbDevice::~cDvbDevice()
   // caused segfaults. Besides, the program is about to terminate anyway...
 }
 
-cString cDvbDevice::DvbName(const char *Name, int Adapter, int Frontend)
+cString DvbName(const char *Name, int Adapter, int Frontend)
 {
   return cString::sprintf("%s/%s%d/%s%d", DEV_DVB_BASE, DEV_DVB_ADAPTER, Adapter, Name, Frontend);
 }
 
-int cDvbDevice::DvbOpen(const char *Name, int Adapter, int Frontend, int Mode, bool ReportError)
+int DvbOpen(const char *Name, int Adapter, int Frontend, int Mode, bool ReportError)
 {
   cString FileName = DvbName(Name, Adapter, Frontend);
   int fd = open(FileName, Mode);
@@ -1669,18 +1820,16 @@ bool cDvbDevice::Probe(int Adapter, int Frontend)
 
 cString cDvbDevice::DeviceType(void) const
 {
-  if (dvbTuner) {
-     if (dvbTuner->FrontendType() != SYS_UNDEFINED)
-        return GetDeliverySystemName(dvbTuner->FrontendType());
-     if (numDeliverySystems)
-        return GetDeliverySystemName(deliverySystems[0]); // to have some reasonable default
-     }
+  if (dvbTuner)
+     return GetDeliverySystemName(dvbTuner->FrontendType());
   return "";
 }
 
 cString cDvbDevice::DeviceName(void) const
 {
-  return frontendInfo.name;
+  if (dvbTuner)
+     return dvbTuner->FrontendName();
+  return "";
 }
 
 bool cDvbDevice::Initialize(void)
@@ -1702,7 +1851,8 @@ bool cDvbDevice::Initialize(void)
                  while ((f = AdapterDir.Next()) != NULL) {
                        if (strstr(f->d_name, DEV_DVB_FRONTEND) == f->d_name) {
                           int Frontend = strtol(f->d_name + strlen(DEV_DVB_FRONTEND), NULL, 10);
-                          Nodes.Append(strdup(cString::sprintf("%2d %2d", Adapter, Frontend)));
+                          if (access(DvbName(DEV_DVB_DEMUX, Adapter, Frontend), F_OK) == 0) // we only create devices for actual demuxes
+                             Nodes.Append(strdup(cString::sprintf("%2d %2d", Adapter, Frontend)));
                           }
                        }
                  }
@@ -1741,9 +1891,11 @@ bool cDvbDevice::Initialize(void)
   return Found > 0;
 }
 
-bool cDvbDevice::QueryDeliverySystems(int fd_frontend)
+//TODO move this up to cDvbFrontend later (leaving it here for now to keep the diff small)
+bool cDvbFrontend::QueryDeliverySystems(void)
 {
-  numDeliverySystems = 0;
+  deliverySystems.Clear();
+  numModulations = 0;
   if (ioctl(fd_frontend, FE_GET_INFO, &frontendInfo) < 0) {
      LOG_ERROR;
      return false;
@@ -1773,11 +1925,9 @@ bool cDvbDevice::QueryDeliverySystems(int fd_frontend)
      int Result = ioctl(fd_frontend, FE_GET_PROPERTY, &CmdSeq);
      if (Result == 0) {
         for (uint i = 0; i < Props[0].u.buffer.len; i++) {
-            if (numDeliverySystems >= MAXDELIVERYSYSTEMS) {
-               esyslog("ERROR: too many delivery systems on frontend %d/%d", adapter, frontend);
-               break;
-               }
-            deliverySystems[numDeliverySystems++] = Props[0].u.buffer.data[i];
+            // activate this line to simulate a multi-frontend device if you only have a single-frontend device with DVB-S and DVB-S2:
+            //if (frontend == 0 && Props[0].u.buffer.data[i] != SYS_DVBS || frontend == 1 && Props[0].u.buffer.data[i] != SYS_DVBS2)
+            deliverySystems.Append(Props[0].u.buffer.data[i]);
             }
         LegacyMode = false;
         }
@@ -1788,22 +1938,22 @@ bool cDvbDevice::QueryDeliverySystems(int fd_frontend)
   if (LegacyMode) {
      // Legacy mode (DVB-API < 5.5):
      switch (frontendInfo.type) {
-       case FE_QPSK: deliverySystems[numDeliverySystems++] = SYS_DVBS;
+       case FE_QPSK: deliverySystems.Append(SYS_DVBS);
                      if (frontendInfo.caps & FE_CAN_2G_MODULATION)
-                        deliverySystems[numDeliverySystems++] = SYS_DVBS2;
+                        deliverySystems.Append(SYS_DVBS2);
                      break;
-       case FE_OFDM: deliverySystems[numDeliverySystems++] = SYS_DVBT;
+       case FE_OFDM: deliverySystems.Append(SYS_DVBT);
                      if (frontendInfo.caps & FE_CAN_2G_MODULATION)
-                        deliverySystems[numDeliverySystems++] = SYS_DVBT2;
+                        deliverySystems.Append(SYS_DVBT2);
                      break;
-       case FE_QAM:  deliverySystems[numDeliverySystems++] = SYS_DVBC_ANNEX_AC; break;
-       case FE_ATSC: deliverySystems[numDeliverySystems++] = SYS_ATSC; break;
+       case FE_QAM:  deliverySystems.Append(SYS_DVBC_ANNEX_AC); break;
+       case FE_ATSC: deliverySystems.Append(SYS_ATSC); break;
        default: esyslog("ERROR: unknown frontend type %d on frontend %d/%d", frontendInfo.type, adapter, frontend);
        }
      }
-  if (numDeliverySystems > 0) {
+  if (deliverySystems.Size() > 0) {
      cString ds("");
-     for (int i = 0; i < numDeliverySystems; i++)
+     for (int i = 0; i < deliverySystems.Size(); i++)
          ds = cString::sprintf("%s%s%s", *ds, i ? "," : "", GetDeliverySystemName(deliverySystems[i]));
      cString ms("");
      if (frontendInfo.caps & FE_CAN_QPSK)      { numModulations++; ms = cString::sprintf("%s%s%s", *ms, **ms ? "," : "", MapToUserString(QPSK, ModulationValues)); }
@@ -1999,11 +2149,7 @@ void cDvbDevice::CloseFilter(int Handle)
 
 bool cDvbDevice::ProvidesDeliverySystem(int DeliverySystem) const
 {
-  for (int i = 0; i < numDeliverySystems; i++) {
-      if (deliverySystems[i] == DeliverySystem)
-         return true;
-      }
-  return false;
+  return dvbTuner->ProvidesDeliverySystem(DeliverySystem);
 }
 
 bool cDvbDevice::ProvidesSource(int Source) const
@@ -2020,20 +2166,9 @@ bool cDvbDevice::ProvidesTransponder(const cChannel *Channel) const
 {
   if (!ProvidesSource(Channel->Source()))
      return false; // doesn't provide source
-  cDvbTransponderParameters dtp(Channel->Parameters());
-  if (!ProvidesDeliverySystem(GetRequiredDeliverySystem(Channel, &dtp)) ||
-     dtp.StreamId()   != 0        && !(frontendInfo.caps & FE_CAN_MULTISTREAM) ||
-     dtp.Modulation() == QPSK     && !(frontendInfo.caps & FE_CAN_QPSK) ||
-     dtp.Modulation() == QAM_16   && !(frontendInfo.caps & FE_CAN_QAM_16) ||
-     dtp.Modulation() == QAM_32   && !(frontendInfo.caps & FE_CAN_QAM_32) ||
-     dtp.Modulation() == QAM_64   && !(frontendInfo.caps & FE_CAN_QAM_64) ||
-     dtp.Modulation() == QAM_128  && !(frontendInfo.caps & FE_CAN_QAM_128) ||
-     dtp.Modulation() == QAM_256  && !(frontendInfo.caps & FE_CAN_QAM_256) ||
-     dtp.Modulation() == QAM_AUTO && !(frontendInfo.caps & FE_CAN_QAM_AUTO) ||
-     dtp.Modulation() == VSB_8    && !(frontendInfo.caps & FE_CAN_8VSB) ||
-     dtp.Modulation() == VSB_16   && !(frontendInfo.caps & FE_CAN_16VSB) ||
-     dtp.Modulation() == PSK_8    && !(frontendInfo.caps & FE_CAN_TURBO_FEC) && dtp.System() == SYS_DVBS) // "turbo fec" is a non standard FEC used by North American broadcasters - this is a best guess to determine this condition
+  if (!dvbTuner->ProvidesFrontend(Channel))
      return false; // requires modulation system which frontend doesn't provide
+  cDvbTransponderParameters dtp(Channel->Parameters());
   if (!cSource::IsSat(Channel->Source()) ||
      (!Setup.DiSEqC || Diseqcs.Get(CardIndex() + 1, Channel->Source(), Channel->Frequency(), dtp.Polarization(), NULL)))
      return DeviceHooksProvidesTransponder(Channel);
@@ -2047,7 +2182,7 @@ bool cDvbDevice::ProvidesChannel(const cChannel *Channel, int Priority, bool *Ne
   bool needsDetachReceivers = false;
   needsDetachBondedReceivers = false;
 
-  if (dvbTuner && ProvidesTransponder(Channel)) {
+  if (ProvidesTransponder(Channel)) {
      result = hasPriority;
      if (Priority > IDLEPRIORITY) {
         if (Receiving()) {
@@ -2097,7 +2232,7 @@ bool cDvbDevice::ProvidesEIT(void) const
 
 int cDvbDevice::NumProvidedSystems(void) const
 {
-  return numDeliverySystems + numModulations;
+  return dvbTuner ? dvbTuner->NumProvidedSystems() : 0;
 }
 
 const cPositioner *cDvbDevice::Positioner(void) const
@@ -2137,9 +2272,11 @@ bool cDvbDevice::MaySwitchTransponder(const cChannel *Channel) const
 
 bool cDvbDevice::SetChannelDevice(const cChannel *Channel, bool LiveView)
 {
-  if (dvbTuner)
+  if (dvbTuner->ProvidesFrontend(Channel, true)) {
      dvbTuner->SetChannel(Channel);
-  return true;
+     return true;
+     }
+  return false;
 }
 
 bool cDvbDevice::HasLock(int TimeoutMs) const