Began work on music selection UI

2017-04-18 23:34:39 -05:00
parent fa87f5e8cf
commit 5a472b21e6
5 changed files with 203 additions and 114 deletions
--- a/core/src/zero1hd/wavedecoder/WavInfo.java
+++ b/core/src/zero1hd/wavedecoder/WavInfo.java
@@ -0,0 +1,114 @@
+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 WavInfo {
+	private int channels;
+	private double sampleRate;
+	private int dataSize;
+	private int byteRate;
+	private FileInputStream audioFile;
+	private DataInputStream readStream;
+	
+	public WavInfo(File file) throws InvalidParameterException {
+		try {
+			audioFile = new FileInputStream(file);
+			initDataStream();
+			getHeaderInfo();
+			closeStreams();
+		} catch (IOException e) {
+			e.printStackTrace();
+		}
+	}
+	
+	protected void getHeaderInfo() throws IOException {
+		if (!readBytesToString(4).equals("RIFF")) { //4
+			throw new InvalidParameterException("RIFF tag not found in header.");
+		}
+		dataSize = littleEndianIntBytes(); //4
+
+		if (!readBytesToString(4).equals("WAVE")) { //4
+			throw new InvalidParameterException("WAVE format tag not found.");
+		}
+		
+		if (!readBytesToString(4).equals("fmt ")) { //4
+			throw new InvalidParameterException("fmt header not found.");
+		}
+		
+		if (readStream.readByte() != 16) { //1
+			throw new InvalidParameterException("Data not pcm?");
+		}
+		
+		readStream.skipBytes(3); //3
+		if (readStream.readByte() != 1) { //1
+			throw new InvalidParameterException("Data not pcm?");
+		}
+		readStream.skipBytes(1); //1
+
+		channels = readStream.readByte(); //1
+		readStream.skipBytes(1); //1
+
+		sampleRate = littleEndianIntBytes(); //4
+		
+		byteRate = littleEndianIntBytes(); //4
+		
+		readStream.skipBytes(38); //38
+		
+		if (!readBytesToString(4).equals("data")) { // 4
+			throw new InvalidParameterException("initial data section tag not found");
+		}
+	}
+	
+	protected void initDataStream() {
+		readStream = new DataInputStream(audioFile);
+	}
+	
+	protected void closeStreams() throws IOException {
+		readStream.close();
+		audioFile.close();
+	}
+	
+	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);
+	}
+	
+	protected short readLittleEndianShort() throws IOException {
+		short data = readStream.readShort();
+		return Short.reverseBytes(data);
+	}
+	
+	protected DataInputStream getReadStream() {
+		return readStream;
+	}
+	
+	public int getChannels() {
+		return channels;
+	}
+	
+	public int getByteRate() {
+		return byteRate;
+	}
+	
+	public int getDataSize() {
+		return dataSize;
+	}
+	
+	public double getSampleRate() {
+		return sampleRate;
+	}
+	
+	public long getDurationInSeconds() {
+		return (long) (dataSize/sampleRate);
+	}
+}