Make MediaStream generate an initial local SSRC

before being started.

src/org/jitsi/impl/neomedia/MediaStreamImpl.java

@@ -173,7 +173,7 @@ else if (MediaDeviceSession.SSRC_LIST.equals(propertyName))
     /**
      * Our own SSRC identifier.
      */
-    private long localSourceID = -1;
+    private long localSourceID = new Random().nextInt();
 
     /**
      * The list of CSRC IDs contributing to the media that this
@@ -250,7 +250,7 @@ else if (MediaDeviceSession.SSRC_LIST.equals(propertyName))
      * instance will employ internal logic to generate new synchronization
      * source (SSRC) identifiers.
      */
-    private SSRCFactory ssrcFactory;
+    private SSRCFactory ssrcFactory = new SSRCFactoryImpl(localSourceID);
 
     /**
      * Initializes a new <tt>MediaStreamImpl</tt> instance which will use the

src/org/jitsi/impl/neomedia/SSRCFactoryImpl.java

+/*
+ * Jitsi, the OpenSource Java VoIP and Instant Messaging client.
+ *
+ * Distributable under LGPL license.
+ * See terms of license at gnu.org.
+ */
+package org.jitsi.impl.neomedia;
+
+import net.sf.fmj.media.rtp.*;
+import org.jitsi.service.neomedia.*;
+
+import java.util.*;
+
+/**
+ * An <tt>SSRCFactory</tt> implementation which allows the first generated
+ * SSRC to be set by the user.
+ *
+ * @author Lyubomir Marinov
+ * @author Boris Grozev
+ */
+class SSRCFactoryImpl
+        implements SSRCFactory
+{
+    private int i = 0;
+    private long initialLocalSSRC = -1;
+
+    /**
+     * The <tt>Random</tt> instance used by this <tt>SSRCFactory</tt> to
+     * generate new synchronization source (SSRC) identifiers.
+     */
+    private final Random random = new Random();
+
+    public SSRCFactoryImpl(long initialLocalSSRC)
+    {
+        this.initialLocalSSRC = initialLocalSSRC;
+    }
+
+    private int doGenerateSSRC()
+    {
+        return random.nextInt();
+    }
+
+    /**
+     * {@inheritDoc}
+     */
+    @Override
+    public long generateSSRC(String cause)
+    {
+        if (initialLocalSSRC != -1)
+        {
+            if (i++ == 0)
+                return (int) initialLocalSSRC;
+            else if (cause.equals(GenerateSSRCCause.REMOVE_SEND_STREAM.name()))
+                return Long.MAX_VALUE;
+        }
+        return doGenerateSSRC();
+    }
+}
+