Interim checkin for call recording.

src/record/wave/WaveUtils.java

@@ -0,0 +1,108 @@
+/*******************************************************************************
+ *     SDR Trunk 
+ *     Copyright (C) 2014 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 record.wave;
+
+import java.nio.ByteBuffer;
+import java.nio.ByteOrder;
+
+import javax.sound.sampled.AudioFormat;
+
+
+public class WaveUtils
+{
+	/**
+	 * Creates a wave file header with the RIFF chunk descriptor and the WAVE
+	 * format chunk 1 and chunk 2 header
+	 */
+	public static ByteBuffer getWaveHeader( AudioFormat format )
+	{
+		ByteBuffer descriptor = ByteBuffer.allocate( 44 );
+		descriptor.order( ByteOrder.LITTLE_ENDIAN );
+
+		/* Chunk ID = RIFF */
+		descriptor.put( (byte)0x52 ); //R
+		descriptor.put( (byte)0x49 ); //I
+		descriptor.put( (byte)0x46 ); //F
+		descriptor.put( (byte)0x46 ); //F
+
+		/* Chunk Size = 36 bytes (initial empty size) */
+		descriptor.put( (byte)36 );
+		descriptor.put( (byte)0 );
+		descriptor.put( (byte)0 );
+		descriptor.put( (byte)0 );
+
+		/* Format = WAVE */
+		descriptor.put( (byte)0x57 ); //W
+		descriptor.put( (byte)0x41 ); //A
+		descriptor.put( (byte)0x56 ); //V
+		descriptor.put( (byte)0x45 ); //E
+
+		/* Sub Chunk 1 ID */
+		descriptor.put( (byte)0x66 ); //f
+		descriptor.put( (byte)0x6D ); //m
+		descriptor.put( (byte)0x74 ); //t
+		descriptor.put( (byte)0x20 ); //space
+
+		/* SubChunk1Size = 1 */
+		descriptor.put( (byte)0x10 );
+		descriptor.put( (byte)0x0 );
+		descriptor.put( (byte)0x0 );
+		descriptor.put( (byte)0x0 );
+
+		/* Audio format = 1 (Uncompressed PCM) */
+		descriptor.put( (byte)0x1 );
+		descriptor.put( (byte)0x0 );
+		
+		/* Number of Channels */
+		descriptor.asShortBuffer().put( (short)format.getChannels() );
+		descriptor.position( descriptor.position() + 2 );
+
+		/* Sample Rate - assumes integral sample rate */
+		descriptor.asIntBuffer().put( (int)format.getSampleRate() );
+		descriptor.position( descriptor.position() + 4 );
+
+		int frameByteRate = format.getChannels() * format.getSampleSizeInBits() / 8;
+		
+		/* Byte Rate = sample rate * channels * bits per sample / 8 */
+		int byteRate = (int)( format.getSampleRate() * frameByteRate );
+		descriptor.asIntBuffer().put( byteRate );
+		descriptor.position( descriptor.position() + 4 );
+
+		/* Block Align */
+		descriptor.asShortBuffer().put( (short)frameByteRate );
+		descriptor.position( descriptor.position() + 2 );
+
+		/* Bits per Sample */
+		descriptor.asShortBuffer().put( (short)( format.getSampleSizeInBits() ) );
+		descriptor.position( descriptor.position() + 2 );
+		
+		/* Sub Chunk 2 ID */
+		descriptor.put( (byte)0x64 ); //d
+		descriptor.put( (byte)0x61 ); //a
+		descriptor.put( (byte)0x74 ); //t
+		descriptor.put( (byte)0x61 ); //a
+
+		/* Sub Chunk 2 Size */
+		descriptor.put( (byte)0x0 );
+		descriptor.put( (byte)0x0 );
+		descriptor.put( (byte)0x0 );
+		descriptor.put( (byte)0x0 );
+		
+		return descriptor;
+	}
+}