128 lines
3.2 KiB
Java
Executable File
128 lines
3.2 KiB
Java
Executable File
package zero1hd.wavedecoder;
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import java.io.DataInputStream;
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import java.io.File;
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import java.io.FileInputStream;
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import java.io.IOException;
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import java.security.InvalidParameterException;
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public class WavInfo {
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private int channels;
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private double sampleRate;
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private int dataSize;
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private int byteRate;
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private FileInputStream audioFile;
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private DataInputStream readStream;
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private String fileName;
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public WavInfo(File file) throws InvalidParameterException {
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try {
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fileName = file.getName();
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audioFile = new FileInputStream(file);
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initDataStream();
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getHeaderInfo();
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closeStreams();
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} catch (IOException e) {
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e.printStackTrace();
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}
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}
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protected void getHeaderInfo() throws IOException {
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if (!readBytesToString(4).equals("RIFF")) { //4 for RIFF tag
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throw new InvalidParameterException("RIFF tag not found in header.");
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}
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dataSize = littleEndianIntBytes(); //4 for Chunk size
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if (!readBytesToString(4).equals("WAVE")) { //4 for WAVE tag
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throw new InvalidParameterException("WAVE format tag not found.");
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}
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if (!readBytesToString(4).equals("fmt ")) { //4 for 'fmt '
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throw new InvalidParameterException("fmt header not found.");
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}
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if (littleEndianIntBytes() != 16) { //subchunk1size (4 bytes)
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throw new InvalidParameterException("Data not pcm?");
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}
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if (readStream.readByte() != 1) { //1 pcm
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throw new InvalidParameterException("Data not pcm?");
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}
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readStream.skip(1); //1
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channels = readStream.readByte(); //1 channel count
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readStream.skip(1); //1
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sampleRate = littleEndianIntBytes(); //4 sample rate
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byteRate = littleEndianIntBytes(); //4
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readStream.skip(4);
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String moreInfo = readBytesToString(4);
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if (moreInfo.equals("LIST")) { // 4
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readStream.skip(30);
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if (!readBytesToString(4).equals("data")) {
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throw new InvalidParameterException("failed to read data with extra info.");
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}
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} else if (!moreInfo.equals("data")) {
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throw new InvalidParameterException("failed to read data.");
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}
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readStream.skip(4);
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}
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protected void initDataStream() {
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readStream = new DataInputStream(audioFile);
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}
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protected void closeStreams() throws IOException {
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readStream.close();
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audioFile.close();
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}
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private String readBytesToString(int bytesToRead) throws IOException {
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byte byteString[] = new byte[bytesToRead];
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readStream.read(byteString);
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return new String(byteString);
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}
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private int littleEndianIntBytes() throws IOException {
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int data = readStream.readInt();
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return Integer.reverseBytes(data);
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}
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protected short readLittleEndianShort() throws IOException {
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short data = readStream.readShort();
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return Short.reverseBytes(data);
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}
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protected DataInputStream getReadStream() {
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return readStream;
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}
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public int getChannels() {
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return channels;
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}
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public int getByteRate() {
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return byteRate;
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}
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public int getDataSize() {
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return dataSize;
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}
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public double getSampleRate() {
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return sampleRate;
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}
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public long getDurationInSeconds() {
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return (long) (dataSize/byteRate);
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}
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public String getFileName() {
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return fileName;
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}
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}
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