#757 Implements Broadcastify Calls API audio broadcaster and resolves audio streaming error introduced with #5 (#773)

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

src/main/java/io/github/dsheirer/audio/broadcast/AbstractAudioBroadcaster.java

@@ -0,0 +1,177 @@
+/*
+ * *****************************************************************************
+ *  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.broadcast;
+
+import io.github.dsheirer.sample.Listener;
+import javafx.beans.property.ObjectProperty;
+import javafx.beans.property.SimpleObjectProperty;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+/**
+ * Base Audio Broadcaster class
+ */
+public abstract class AbstractAudioBroadcaster<T extends BroadcastConfiguration> implements Listener<AudioRecording>
+{
+    private final static Logger mLog = LoggerFactory.getLogger(AbstractAudioBroadcaster.class);
+    private Listener<BroadcastEvent> mBroadcastEventListener;
+    private T mBroadcastConfiguration;
+    protected ObjectProperty<BroadcastState> mBroadcastState = new SimpleObjectProperty<>(BroadcastState.READY);
+    protected int mStreamedAudioCount = 0;
+    protected int mErrorAudioCount = 0;
+    protected int mAgedOffAudioCount = 0;
+
+    /**
+     * Constructs an instance
+     * @param broadcastConfiguration to use for this broadcaster
+     */
+    public AbstractAudioBroadcaster(T broadcastConfiguration)
+    {
+        mBroadcastConfiguration = broadcastConfiguration;
+    }
+
+    /**
+     * Observable broadcast state property
+     */
+    public ObjectProperty<BroadcastState> broadcastStateProperty()
+    {
+        return mBroadcastState;
+    }
+
+    /**
+     * Current state of the broadcastAudio connection
+     */
+    public BroadcastState getBroadcastState()
+    {
+        return mBroadcastState.get();
+    }
+
+    /**
+     * Sets or changes the broadcast state
+     */
+    public void setBroadcastState(BroadcastState broadcastState)
+    {
+        mBroadcastState.setValue(broadcastState);
+        broadcast(new BroadcastEvent(this, BroadcastEvent.Event.BROADCASTER_STATE_CHANGE));
+    }
+
+    /**
+     * Starts the broadcaster
+     */
+    public abstract void start();
+
+    /**
+     * Stops the broadcaster
+     */
+    public abstract void stop();
+
+    /**
+     * Perform any shutdown related tasks.
+     */
+    public abstract void dispose();
+
+    /**
+     * Access the configuration for the broadcaster
+     */
+    public T getBroadcastConfiguration()
+    {
+        return mBroadcastConfiguration;
+    }
+
+    /**
+     * Registers the listener to receive broadcast events/state changes
+     */
+    public void setListener(Listener<BroadcastEvent> listener)
+    {
+        mBroadcastEventListener = listener;
+    }
+
+    /**
+     * Removes the listener from receiving broadcast events/state changes
+     */
+   public void removeListener()
+   {
+       mBroadcastEventListener = null;
+   }
+
+    /**
+     * Broadcasts the event to any registered listener
+     */
+    protected void broadcast(BroadcastEvent event)
+    {
+        if(mBroadcastEventListener != null)
+        {
+            mBroadcastEventListener.receive(event);
+        }
+    }
+
+    /**
+     * Number of audio recordings streamed to remote server
+     */
+    public int getStreamedAudioCount()
+    {
+        return mStreamedAudioCount;
+    }
+
+    /**
+     * Increments the streamed or uploaded audio count by one
+     */
+    public void incrementStreamedAudioCount()
+    {
+        mStreamedAudioCount++;
+    }
+
+    /**
+     * Number of audio recordings that were removed for exceeding age limit
+     */
+    public int getAgedOffAudioCount()
+    {
+        return mAgedOffAudioCount;
+    }
+
+    /**
+     * Increments the aged-off audio count by one
+     */
+    public void incrementAgedOffAudioCount()
+    {
+        mAgedOffAudioCount++;
+    }
+
+    /**
+     * Number of audio recordings awaiting streaming or upload
+     */
+    public abstract int getAudioQueueSize();
+
+    /**
+     * Total audio upload/stream error count
+     */
+    public int getAudioErrorCount()
+    {
+        return mErrorAudioCount;
+    }
+
+    /**
+     * Increments the error audio count by one
+     */
+    public void incrementErrorAudioCount()
+    {
+        mErrorAudioCount++;
+    }
+}