#1397 Adds channel fft frequency overlay, cursor readout, pll tracking indicator, and channel bandwidth lines. (#1406)

Co-authored-by: Dennis Sheirer <dsheirer@github.com>

src/main/java/io/github/dsheirer/sample/complex/ComplexSamplesToNativeBufferModule.java

@@ -0,0 +1,90 @@
+/*
+ * *****************************************************************************
+ * Copyright (C) 2014-2023 Dennis Sheirer
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>
+ * ****************************************************************************
+ */
+
+package io.github.dsheirer.sample.complex;
+
+import io.github.dsheirer.buffer.INativeBuffer;
+import io.github.dsheirer.module.Module;
+import io.github.dsheirer.sample.Listener;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+/**
+ * Simple module that can be added live to a processing chain to tap into the stream of ComplexSamples buffers and
+ * convert them to INativeBuffers for relay to a registered native buffer listener.
+ */
+public class ComplexSamplesToNativeBufferModule extends Module implements IComplexSamplesListener, Listener<ComplexSamples>
+{
+    private static final Logger mLog = LoggerFactory.getLogger(ComplexSamplesToNativeBufferModule.class);
+    private Listener<INativeBuffer> mNativeBufferListener;
+
+    public ComplexSamplesToNativeBufferModule()
+    {
+    }
+
+    @Override
+    public Listener<ComplexSamples> getComplexSamplesListener()
+    {
+        return this;
+    }
+
+    /**
+     * Primary receive method to process complex samples buffer by wrapping with a native buffer adapter and sending
+     * to the registered listener.
+     *
+     * Note: this method is synchronized to ensure that multiple calling threads don't step on each other.
+     *
+     * @param complexSamples to process and relay.
+     */
+    @Override
+    public synchronized void receive(ComplexSamples complexSamples)
+    {
+        if(mNativeBufferListener != null)
+        {
+            mNativeBufferListener.receive(new ComplexSamplesNativeBufferAdapter(complexSamples));
+        }
+    }
+
+    /**
+     * Registers the listener to receive native buffers.
+     * @param listener to register
+     */
+    public void setListener(Listener<INativeBuffer> listener)
+    {
+        mNativeBufferListener = listener;
+    }
+
+    /**
+     * Unregisters a listener from receiving native buffers.
+     */
+    public void removeListener()
+    {
+        mNativeBufferListener = null;
+    }
+
+    @Override
+    public void reset() {}
+
+    @Override
+    public void start() {}
+
+    @Override
+    public void stop() {}
+
+}