Fix wrong stream getting disabled in interleaved mode

When building packets in interleaved mode, we do 2 passes over the
streams.

In the first pass, we build a number of lists of variables for each
**enabled** stream. One of these variables is the pktBuf content.

In the second pass, we use these lists to build the packets. If the
stream is not variable, we just use the packet content built in the
first pass. However, if the stream is variable we call frameValue to get
the packet content, but we index with the wrong value into stream list
 if we have some disabled streams before us.

Fixes #328

server/abstractport.cpp

@@ -411,6 +411,7 @@ int AbstractPort::updatePacketListInterleaved()
     int numStreams = 0;
     quint64 minGap = ULLONG_MAX;
     quint64 duration = quint64(1e9);
+    QList<int> streamId;
     QList<quint64> ibg1, ibg2;
     QList<quint64> nb1, nb2;
     QList<quint64> ipg1, ipg2;
@@ -447,6 +448,8 @@ int AbstractPort::updatePacketListInterleaved()
         if (!streamList_[i]->isEnabled())
             continue;
 
+        streamId.append(i);
+
         double numBursts = 0;
         double numPackets = 0;
 
@@ -458,6 +461,7 @@ int AbstractPort::updatePacketListInterleaved()
         quint64 _ipg1 = 0, _ipg2 = 0;
         quint64 _np1 = 0, _np2 = 0;
 
+
         switch (streamList_[i]->sendUnit())
         {
         case OstProto::StreamControl::e_su_bursts:
@@ -590,7 +594,7 @@ int AbstractPort::updatePacketListInterleaved()
                 {
                     FrameValueAttrib attrib;
                     buf = pktBuf_;
-                    len = streamList_[i]->frameValue(pktBuf_, sizeof(pktBuf_), 
+                    len = streamList_[streamId.at(i)]->frameValue(pktBuf_, sizeof(pktBuf_),
                             pktCount[i], &attrib);
                     packetListAttrib += attrib;
                 }