2537 Complex Vector Oscillator (256/512) Lanes Can Drift Apart Over Time (#2538)

* #2535 Heterodyne Channelizer enhancements and corrections.

* #2537 Complex vector oscillator SIMD lane drift.

Realigns the SIMD lanes every 262,144 samples. At frequencies where the
rotation for a set of lanes is nearly a whole or half turn, rounding affects
each lane differently and the lanes drift apart until the next frequency
change, producing spurs at multiples of the sample rate divided by the lane
count.  Lane phase error at 3125 Hz with a 50 kHz sample rate was about -38 dBc
after one hour and is now about -83 dBc with 16 lanes and -73 dBc with 8 lanes.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

* #2537 test updates

* #2537 test updates

---------

Co-authored-by: denny <dennis.sheirer@gmail.com>
Co-authored-by: Claude Opus 5.5 <noreply@anthropic.com>

src/main/java/io/github/dsheirer/controller/channel/ChannelProcessingManager.java

@@ -418,6 +418,11 @@ public class ChannelProcessingManager implements Listener<ChannelEvent>
             throw new ChannelException("No Tuner Available");
         }
 
+        if(source instanceof TunerChannelSource tunerChannelSource)
+        {
+            tunerChannelSource.setStartTimestamp(request.getStartTimestamp());
+        }
+
         ProcessingChain processingChain = new ProcessingChain(channel, mAliasModel);
 
         //Certain decoders aggregate the decode events in the parent channel that also includes any events produced

src/main/java/io/github/dsheirer/controller/channel/event/ChannelStartProcessingRequest.java

@@ -42,6 +42,7 @@ public class ChannelStartProcessingRequest extends ModuleEventBusMessage
     private DecodeEventHistory mParentDecodeEventHistory;
     private DecodeEventHistory mChildDecodeEventHistory;
     private boolean mPersistentAttempt;
+    private long mStartTimestamp;
 
     /**
      * Constructs an instance
@@ -109,6 +110,25 @@ public class ChannelStartProcessingRequest extends ModuleEventBusMessage
         return mPersistentAttempt;
     }
 
+    /**
+     * Sets the timestamp of the channel grant so that a tuner channel source with a sample delay buffer can preload the
+     * channel with the samples that occurred after the grant, while the grant was being decoded and processed.
+     * @param timestamp of the channel grant in milliseconds since epoch.
+     */
+    public void setStartTimestamp(long timestamp)
+    {
+        mStartTimestamp = timestamp;
+    }
+
+    /**
+     * Timestamp for the oldest samples requested for the channel.
+     * @return timestamp in milliseconds since epoch, or 0 if the channel should start with current samples.
+     */
+    public long getStartTimestamp()
+    {
+        return mStartTimestamp;
+    }
+
     /**
      * Channel to start processing
      * @return channel to start