Ticket #13355: 20190304_hd_simulcast.patch

mythtv/libs/libmythtv/channelscan/channelscan_sm.cpp

@@ -1309 +1309 @@
 
     // NIT
     QMap<qlonglong, uint> ukChanNums;
+    QMap<qlonglong, uint> scnChanNums;
     QMap<uint,ChannelInsertInfo>::iterator dbchan_it;
     for (dbchan_it = pnum_to_dbchan.begin();
          dbchan_it != pnum_to_dbchan.end(); ++dbchan_it)
@@ -1338 +1339 @@
                     MPEGDescriptor::Parse(nit->TransportDescriptors(i),
                                           nit->TransportDescriptorsLength(i));
 
-                const unsigned char *desc =
-                    MPEGDescriptor::Find(
-                        list, PrivateDescriptorID::dvb_logical_channel_descriptor);
+                // Logical channel numbers
+                {
+                    const unsigned char *desc =
+                        MPEGDescriptor::Find(
+                            list, PrivateDescriptorID::dvb_logical_channel_descriptor);
 
-                if (desc)
+                    if (desc)
+                    {
+                        DVBLogicalChannelDescriptor uklist(desc);
+                        for (uint j = 0; j < uklist.ChannelCount(); ++j)
+                        {
+                            ukChanNums[((qlonglong)info.m_orig_netid<<32) |
+                                    uklist.ServiceID(j)] =
+                                uklist.ChannelNumber(j);
+                        }
+                    }
+                }
+
+                // HD Simulcast logical channel numbers
                 {
-                    DVBLogicalChannelDescriptor uklist(desc);
-                    for (uint j = 0; j < uklist.ChannelCount(); ++j)
+                    const unsigned char *desc =
+                        MPEGDescriptor::Find(
+                            list, PrivateDescriptorID::dvb_simulcast_channel_descriptor);
+
+                    if (desc)
                     {
-                        ukChanNums[((qlonglong)info.m_orig_netid<<32) |
-                                   uklist.ServiceID(j)] =
-                            uklist.ChannelNumber(j);
+                        DVBSimulcastChannelDescriptor scnlist(desc);
+
+                        for (uint j = 0; j < scnlist.ChannelCount(); ++j)
+                        {
+                            scnChanNums[((qlonglong)info.m_orig_netid<<32) |
+                                        scnlist.ServiceID(j)] =
+                                 scnlist.ChannelNumber(j);
+                        }
                     }
                 }
             }
@@ -1367 +1390 @@
 
         if (iptv_channel.isEmpty()) // DVB Logical channel numbers (LCN)
         {
-            QMap<qlonglong, uint>::const_iterator it = ukChanNums.find
-                       (((qlonglong)info.m_orig_netid<<32) | info.m_service_id);
-
-            if (it != ukChanNums.end())
-                info.m_chan_num = QString::number(*it);
+            {
+                // Look for a logical channel number in the HD simulcast channel numbers.
+                // This gives the correct channel number when HD and SD versions of the same
+                // channel are simultaneously broadcast and the receiver is capable
+                // of receiving the HD signal.
+                QMap<qlonglong, uint>::const_iterator it = scnChanNums.find
+                        (((qlonglong)info.m_orig_netid<<32) | info.m_service_id);
+
+                if (it != scnChanNums.end())
+                {
+                    info.m_chan_num = QString::number(*it);
+                    continue;
+                }
+            }
+            {
+                // If there is no simulcast for this channel then descriptor 0x83
+                // gives the logical channel number. This can be either an SD
+                // or an HD channel.
+                QMap<qlonglong, uint>::const_iterator it = ukChanNums.find
+                        (((qlonglong)info.m_orig_netid<<32) | info.m_service_id);
+
+                if (it != ukChanNums.end())
+                    info.m_chan_num = QString::number(*it);
+            }
         }
         else // IPTV programs
         {

mythtv/libs/libmythtv/mpeg/dvbdescriptors.cpp

@@ -597 +597 @@
     return ret;
 }
 
+QString DVBSimulcastChannelDescriptor::toString() const
+{
+    QString ret = "DVBSimulcastChannelDescriptor sid->chan_num: ";
+    for (uint i = 0; i < ChannelCount(); i++)
+    {
+        ret += QString("%1->%2").arg(ServiceID(i)).arg(ChannelNumber(i));
+        ret += (i+1<ChannelCount()) ? ", " : "";
+    }
+    return ret;
+}
+
 QString CAIdentifierDescriptor::toString(void) const
 {
     QString ret = QString("CAIdentifierDescriptor ");

mythtv/libs/libmythtv/mpeg/dvbdescriptors.h

@@ -2071 +2071 @@
     QString toString(void) const override; // MPEGDescriptor
 };
 
+/**
+ *  \brief DVB HD Simulcast Logical Channel Descriptor
+ *
+ * NIT descriptor ID 0x88 (Private Extension)
+ *
+ * Provides the Logical Channel Number (LCN) for each channel when the channel
+ * is simultaneously broadcast in SD and HD.
+ */
+class DVBSimulcastChannelDescriptor : public MPEGDescriptor
+{
+  public:
+    DVBSimulcastChannelDescriptor(const unsigned char *data, int len = 300) :
+        MPEGDescriptor(data, len, PrivateDescriptorID::dvb_simulcast_channel_descriptor) { }
+    //       Name             bits  loc  expected value
+    // descriptor_tag           8   0.0       0x88
+    // descriptor_length        8   1.0
+
+    uint ChannelCount(void) const { return DescriptorLength() >> 2; }
+
+    uint ServiceID(uint i) const
+        { return (_data[2 + (i<<2)] << 8) | _data[3 + (i<<2)]; }
+
+    uint ChannelNumber(uint i) const
+        { return ((_data[4 + (i<<2)] << 8) | _data[5 + (i<<2)]) & 0x3ff; }
+
+    QString toString(void) const override; // MPEGDescriptor
+};
+
 // ETSI TS 102 323 (TV Anytime)
 class DVBContentIdentifierDescriptor : public MPEGDescriptor
 {

mythtv/libs/libmythtv/mpeg/mpegdescriptors.cpp

@@ -436 +436 @@
     /// POSSIBLY UNSAFE ! -- begin
     else if (PrivateDescriptorID::dvb_logical_channel_descriptor == DescriptorTag())
         SET_STRING(DVBLogicalChannelDescriptor);
+    else if (PrivateDescriptorID::dvb_simulcast_channel_descriptor == DescriptorTag())
+        SET_STRING(DVBSimulcastChannelDescriptor);
     /// POSSIBLY UNSAFE ! -- end
     else if (IsValid())
     {

mythtv/libs/libmythtv/mpeg/mpegdescriptors.h

@@ -180 +180 @@
         // These can conflict and should only be used
         // on these specific networks.
 
-        // Private -- UK
+        // Private -- UK and NL
         dvb_logical_channel_descriptor = 0x83, /* implemented */
+        dvb_simulcast_channel_descriptor = 0x88, /* implemented */
 
         // Private -- Dish Network
         dish_event_rights              = 0x87,