Ticket #12092: 0023-delay-concurent-tunings.patch

mythtv/libs/libmythtv/recorders/dvbchannel.cpp

@@ -55 +55 @@
 static DTVMultiplex dvbparams_to_dtvmultiplex(
     DTVTunerType, const dvb_frontend_parameters&);
 
+qint64 concurrent_tunings_delay = 1000;
+QDateTime DVBChannel::last_tuning = QDateTime::currentDateTime();
+
 #define LOC QString("DVBChan[%1](%2): ").arg(GetCardID()).arg(GetDevice())
 
 /** \class DVBChannel
@@ -96 +99 @@
     master_map_lock.unlock();
 
     sigmon_delay = CardUtil::GetMinSignalMonitoringDelay(device);
+
 }
 
 DVBChannel::~DVBChannel()
@@ -710 +714 @@
 
     if (reset || !prev_tuning.IsEqual(tunerType, tuning, 500 * freq_mult))
     {
+
         LOG(VB_CHANNEL, LOG_INFO, LOC + QString("Tune(): Tuning to %1%2")
                 .arg(intermediate_freq ? intermediate_freq : tuning.frequency)
                 .arg(suffix));
 
+        tune_delay_lock.lock();
+
+        if (QDateTime::currentDateTime() < last_tuning)
+        {
+            LOG(VB_GENERAL, LOG_INFO, LOC + QString("Next tuning after less than %1ms. Delaying by %1ms")
+                .arg(concurrent_tunings_delay));
+            usleep(concurrent_tunings_delay * 1000);
+        }
+
+        last_tuning = QDateTime::currentDateTime();
+        last_tuning = last_tuning.addMSecs(concurrent_tunings_delay);
+
+        tune_delay_lock.unlock();
+
         // send DVB-S setup
         if (diseqc_tree)
         {
@@ -812 +831 @@
                     "Tune(): Setting Frontend tuning parameters failed." + ENO);
                 return false;
             }
+
         }
         else
 #endif

mythtv/libs/libmythtv/recorders/dvbchannel.h

@@ -144 +144 @@
     int               fd_frontend; ///< File descriptor for tuning hardware
     QString           device;      ///< DVB Device
     bool              has_crc_bug; ///< true iff our driver munges PMT
+
+    static QDateTime  last_tuning;
+    QMutex            tune_delay_lock;
+
 };
 
 #endif