Initial commit

core/src/zero1hd/wavedecoder/WavDecoder.java

@@ -0,0 +1,115 @@
+package zero1hd.wavedecoder;
+
+import java.io.DataInputStream;
+import java.io.File;
+import java.io.FileInputStream;
+import java.io.IOException;
+import java.security.InvalidParameterException;
+
+public class WavDecoder {
+	DataInputStream readStream;
+	private int channels;
+	private double sampleRate;
+	private int dataSize;
+	private int byteRate;
+	
+	public void setAudioFile(File file) throws InvalidParameterException {
+		try {
+			FileInputStream audioFile = new FileInputStream(file);
+			readStream = new DataInputStream(audioFile);
+
+			if (!readBytesToString(4).equals("RIFF")) {
+				throw new InvalidParameterException("RIFF tag not found in header.");
+			}
+			dataSize = littleEndianIntBytes();
+
+			if (!readBytesToString(4).equals("WAVE")) {
+				throw new InvalidParameterException("WAVE format tag not found.");
+			}
+			
+			if (!readBytesToString(4).equals("fmt ")) {
+				throw new InvalidParameterException("fmt header not found.");
+			}
+			
+			if (readStream.readByte() != 16) {
+				throw new InvalidParameterException("Data not pcm?");
+			}
+			
+			readStream.skipBytes(3);
+			if (readStream.readByte() != 1) {
+				throw new InvalidParameterException("Data not pcm?");
+			}
+			readStream.skipBytes(1);
+
+			channels = readStream.readByte();
+			readStream.skipBytes(1);
+
+			sampleRate = littleEndianIntBytes();
+			
+			byteRate = littleEndianIntBytes();
+			
+			readStream.skipBytes(38);
+			
+			if (!readBytesToString(4).equals("data")) {
+				throw new InvalidParameterException("initial data section tag not found");
+			}
+			readStream.skipBytes(4);
+		} catch (IOException e) {
+			e.printStackTrace();
+		}
+	}
+
+	private String readBytesToString(int bytesToRead) throws IOException {
+		byte byteString[] = new byte[bytesToRead];
+		readStream.read(byteString);
+		return new String(byteString);
+	}
+
+	private int littleEndianIntBytes() throws IOException {
+		int data = readStream.readInt();
+		return Integer.reverseBytes(data);
+	}
+	
+	private short readLittleEndianShort() throws IOException {
+		short data = readStream.readShort();
+		return Short.reverseBytes(data);
+	}
+	
+	public int getChannels() {
+		return channels;
+	}
+	
+	public double getSampleRate() {
+		return sampleRate;
+	}
+	
+	public int getByteRate() {
+		return byteRate;
+	}
+	
+	public int getDataSize() {
+		return dataSize;
+	}
+	
+	public int readSamples(float[] samples) {
+		int samplesRead = 0;
+		
+		for (int i = 0; i < samples.length; i++) {
+			try {
+				
+				int currentSample = 0;
+				for (int channel = 0; channel < channels; channel++) {
+					currentSample += readLittleEndianShort();
+				}
+				currentSample /= channels*Short.MAX_VALUE+1;
+				samples[i] = currentSample;
+				samplesRead++;
+			} catch (IOException e) {
+				break;
+			}
+		}
+		
+		return samplesRead;
+	}
+	
+}