#30 - WIP Streaming audio support. Adds Shoutcast V1 handler.

src/audio/AudioUtils.java

@@ -0,0 +1,58 @@
+/*******************************************************************************
+ * sdrtrunk
+ * Copyright (C) 2014-2016 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 audio;
+
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import record.wave.RealBufferWaveRecorder;
+import sample.ConversionUtils;
+
+import java.io.ByteArrayOutputStream;
+import java.io.IOException;
+import java.nio.ByteBuffer;
+import java.util.List;
+
+public class AudioUtils
+{
+    private final static Logger mLog = LoggerFactory.getLogger(AudioUtils.class);
+
+    /**
+     * Converts the audio packets into a byte array of 16-bit, little-endian audio samples
+     */
+    public static byte[] convertTo16BitSamples(List<AudioPacket> audioPackets)
+    {
+        ByteArrayOutputStream stream = new ByteArrayOutputStream();
+
+        try
+        {
+            for(AudioPacket packet: audioPackets)
+            {
+                //Converting from 32-bit floats to signed 16-bit samples
+                ByteBuffer buffer = ConversionUtils.convertToSigned16BitSamples(packet.getAudioBuffer().getSamples());
+                stream.write(buffer.array());
+            }
+        }
+        catch(IOException e)
+        {
+            mLog.error("Error writing converted PCM bytes to output stream");
+        }
+
+        return stream.toByteArray();
+    }
+}