#438 Adds feature for duplicate call audio detection and suppression for playback, recording and streaming. (#835)

Co-authored-by: Denny <denny@denny-desktop>

src/main/java/io/github/dsheirer/audio/AudioSegment.java

@@ -65,6 +65,7 @@ public class AudioSegment implements Listener<IdentifierUpdateNotification>
 {
     private final static Logger mLog = LoggerFactory.getLogger(AudioSegment.class);
     private BooleanProperty mComplete = new SimpleBooleanProperty(false);
+    private BooleanProperty mDuplicate = new SimpleBooleanProperty(false);
     private BooleanProperty mRecordAudio = new SimpleBooleanProperty(false);
     private IntegerProperty mMonitorPriority = new SimpleIntegerProperty(Priority.DEFAULT_PRIORITY);
     private ObservableSet<BroadcastChannel> mBroadcastChannels = FXCollections.observableSet(new HashSet<>());
@@ -74,6 +75,7 @@ public class AudioSegment implements Listener<IdentifierUpdateNotification>
     private AtomicInteger mConsumerCount = new AtomicInteger();
     private AliasList mAliasList;
     private long mStartTimestamp = System.currentTimeMillis();
+    private long mSampleCount = 0;
     private boolean mDisposing = false;
     private AudioSegment mLinkedAudioSegment;
     private int mTimeslot;
@@ -107,6 +109,24 @@ public class AudioSegment implements Listener<IdentifierUpdateNotification>
         return mStartTimestamp;
     }
 
+    /**
+     * End timestamp as calculated from start timestamp and current sample count
+     */
+    public long getEndTimestamp()
+    {
+        return mStartTimestamp + getDuration();
+    }
+
+    /**
+     * Current duration of this audio segment.  Note: this is a dynamic value until the complete property is set to true.
+     *
+     * @return duration in milliseconds
+     */
+    public long getDuration()
+    {
+        return (mSampleCount / 8); //8 kHz audio generates 8 samples per millisecond
+    }
+
     /**
      * The complete property is used by the audio segment producer to signal that the segment is complete and no
      * additional audio or identifiers will be added to the segment.
@@ -118,6 +138,15 @@ public class AudioSegment implements Listener<IdentifierUpdateNotification>
         return mComplete;
     }
 
+    /**
+     * Duplicate call audio property.  This flag is set to true whenever a duplicate call detection function detects
+     * an audio segment is a duplicate.
+     */
+    public BooleanProperty duplicateProperty()
+    {
+        return mDuplicate;
+    }
+
     /**
      * An observable list of broadcast channels for this audio segment.  Broadcast channels are added to this segment
      * across the life-cycle of the segment.  As each new alias identifier is added to the segment, any broadcast
@@ -347,6 +376,7 @@ public class AudioSegment implements Listener<IdentifierUpdateNotification>
         }
 
         mAudioBuffers.add(audioBuffer);
+        mSampleCount += audioBuffer.length;
     }
 
     /**
@@ -396,6 +426,23 @@ public class AudioSegment implements Listener<IdentifierUpdateNotification>
         }
     }
 
+    /**
+     * Indicates if this audio segment has been flagged as a duplicate audio call
+     */
+    public boolean isDuplicate()
+    {
+        return mDuplicate.get();
+    }
+
+    /**
+     * Sets the duplicate audio call flag for this audio segment
+     * @param duplicate true if this is a duplicate audio segment
+     */
+    public void setDuplicate(boolean duplicate)
+    {
+        mDuplicate.set(duplicate);
+    }
+
     /**
      * Processes identifier update notifications and updates audio segment properties using the associated aliases
      * from the alias list.