#660 Updates audio processing subsystem to use audio segments. Updates audio playback, recording and streaming to use audio segments. Adds support to UserPreferences for sound card selection and audio tone insertion during playback. Adds record preference for WAVE or MP3. Resolves issues with metadata in recordings. (#675)

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

@@ -0,0 +1,52 @@
+/*
+ * *****************************************************************************
+ *  Copyright (C) 2014-2020 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.audio;
+
+import io.github.dsheirer.sample.Broadcaster;
+import io.github.dsheirer.sample.Listener;
+import io.github.dsheirer.sample.buffer.AbstractReusableBuffer;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+public class AudioSegmentBroadcaster<T extends AudioSegment> extends Broadcaster<T>
+{
+    private final static Logger mLog = LoggerFactory.getLogger(AudioSegmentBroadcaster.class);
+
+    /**
+     * Increments the consumer count for the reusable complex buffer and then broadcasts the buffer to all registered
+     * listeners.
+     *
+     * The total consumer count is established and applied to the buffer prior to dispatching.  If we were to simply
+     * increment the consumer count prior to sending to each consumer, there is a possibility that the consumer could
+     * immediately decrement the consumer count and prematurely signal that the buffer is ready for disposal before we
+     * send the buffer to all consumers.
+     */
+    @Override
+    public void broadcast(T audioSegment)
+    {
+        for(Listener<T> listener : mListeners)
+        {
+            audioSegment.incrementConsumerCount();
+            listener.receive(audioSegment);
+        }
+
+        //Decrement consumer counter for this broadcaster
+        audioSegment.decrementConsumerCount();
+    }
+}