First pieces of the CSRC audio level encoding code

src/net/java/sip/communicator/impl/neomedia/RawPacket.java

@@ -46,6 +46,11 @@ public class RawPacket
      */
     public static final int FIXED_HEADER_SIZE = 12;
 
+    /**
+     * The size of the extension header as defined by RFC 3550.
+     */
+    public static final int EXT_HEADER_SIZE = 12;
+
     /**
      * Construct a RawPacket using specified value.
      *
@@ -466,7 +471,7 @@ public boolean getExtensionBit()
      * @param extBit the flag that indicates whether we are to set or clear
      * the extension bit of this packet.
      */
-    public void setExtensionBit(boolean extBit)
+    private void setExtensionBit(boolean extBit)
     {
         if(extBit)
             buffer[offset] |= 0x10;
@@ -474,6 +479,42 @@ public void setExtensionBit(boolean extBit)
             buffer[offset] &= 0xEF;
     }
 
+    /**
+     * Returns the length of the extensions currently added to this packet.
+     *
+     * @return the length of the extensions currently added to this packet.
+     */
+    public int getExtensionsLength()
+    {
+        //the extension length comes after the RTP header, the CSRC list, and
+        //after two bytes in the extension header called "defined by profile"
+        int extLenIndex =  offset
+                        + FIXED_HEADER_SIZE
+                        + getCsrcCount()*4 + 2;
+
+        return (int)( (buffer[extLenIndex] << 4) | buffer[extLenIndex + 1]);
+    }
+
+    /**
+     * Sets the length of the extensions currently recorded in this packet's
+     * buffer.
+     *
+     * @param length the length of the extensions currently recorded in the
+     * buffer of this packet.
+     */
+    private void setExtensionsLength(int length)
+    {
+        //the extension length comes after the RTP header, the CSRC list, and
+        //after two bytes in the extension header called "defined by profile"
+        int extLenIndex =  offset
+                        + FIXED_HEADER_SIZE
+                        + getCsrcCount()*4 + 2;
+
+        buffer[extLenIndex] = (byte)(length >> 4);
+        buffer[extLenIndex + 1] = (byte)length;
+    }
+
+
     /**
      * Adds the <tt>extBuff</tt> buffer to as an extension of this packet
      * according the rules specified in RFC 5285. Note that this method does
@@ -486,6 +527,8 @@ public void setExtensionBit(boolean extBit)
      */
     public void addExtension(byte[] extBuff, int length)
     {
+        byte[] newBuffer = new byte[getLength() + EXT_HEADER_SIZE + length ];
+
 
 
     }

src/net/java/sip/communicator/impl/neomedia/transform/csrc/CsrcTransformEngine.java

@@ -124,9 +124,6 @@ public synchronized RawPacket transform(RawPacket pkt)
         if(this.csrcAudioLevelExtID > 0
            && mediaStream instanceof AudioMediaStreamImpl)
         {
-            AudioMediaStreamImpl audioStream
-                = (AudioMediaStreamImpl)mediaStream;
-
             byte[] levelsExt = createLevelExtensionBuffer(csrcList);
 
             pkt.addExtension(levelsExt, extensionBuffLen);