One-part channel number for ATSC cable

Implement the one-part channel number for ATSC cable as defined
in ATSC standard A65/2013  7 August 2013  page 35.
In this case the ATSC major number is 1008 (0x3F0) or higher
and all channels in all multiplexes have this major number.
Change the name of the MPTS full-transport stream channel
to use the freqid instead of the major number when
the one-part channel number is used.

mythtv/libs/libmythtv/channelscan/channelscan_sm.cpp

@@ -1366,6 +1366,14 @@ ChannelScanSM::GetChannelList(transport_scan_items_it_t trans_info,
             uint pnum = cvct->ProgramNumber(i);
             PCM_INFO_INIT("atsc");
             update_info(info, cvct, i);
+
+            // One-part channel number, as defined in the ATSC Standard:
+            // Program and System Information Protocol for Terrestrial Broadcast and Cable
+            // Doc. A65/2013  7 August 2013  page 35
+            if ((info.m_atscMajorChannel & 0x3F0) == 0x3F0)
+            {
+                info.m_chanNum = (info.m_atscMajorChannel & 0x00F) << 10 + info.m_atscMinorChannel;
+            }
         }
     }
 
@@ -1763,8 +1771,14 @@ ScanDTVTransportList ChannelScanSM::GetChannelList(bool addFullTS) const
                 }
                 else if (info.m_atscMajorChannel > 0)
                 {
-                    info.m_callSign =
-                        QString("MPTS_%1").arg(info.m_atscMajorChannel);
+                    if (info.m_atscMajorChannel < 0x3F0)
+                    {
+                        info.m_callSign = QString("MPTS_%1").arg(info.m_atscMajorChannel);
+                    }
+                    else
+                    {
+                        info.m_callSign = QString("MPTS_%1").arg(info.m_freqId);
+                    }
                 }
                 else if (info.m_serviceId > 0)
                 {