Current File : /home/tjamichg/cursos.tjamich.gob.mx/plugin/jcapture/src/com/hammurapi/jcapture/WavFile.java
package com.hammurapi.jcapture;
// This file was taken from http://www.labbookpages.co.uk/audio/javaWavFiles.html
// Wav file IO class
// A.Greensted
// http://www.labbookpages.co.uk
// File format is based on the information from
// http://www.sonicspot.com/guide/wavefiles.html
// http://www.blitter.com/~russtopia/MIDI/~jglatt/tech/wave.htm
// Version 1.0
import java.io.*;
public class WavFile {
private enum IOState {
READING, WRITING, CLOSED
};
private final static int BUFFER_SIZE = 4096;
private final static int FMT_CHUNK_ID = 0x20746D66;
private final static int DATA_CHUNK_ID = 0x61746164;
private final static int RIFF_CHUNK_ID = 0x46464952;
private final static int RIFF_TYPE_ID = 0x45564157;
private File file; // File that will be read from or written to
private IOState ioState; // Specifies the IO State of the Wav File (used for
// snaity checking)
private int bytesPerSample; // Number of bytes required to store a single
// sample
private long numFrames; // Number of frames within the data section
private FileOutputStream oStream; // Output stream used for writting data
private FileInputStream iStream; // Input stream used for reading data
private double floatScale; // Scaling factor used for int <-> float
// conversion
private double floatOffset; // Offset factor used for int <-> float
// conversion
private boolean wordAlignAdjust; // Specify if an extra byte at the end of
// the data chunk is required for word
// alignment
// Wav Header
private int numChannels; // 2 bytes unsigned, 0x0001 (1) to 0xFFFF (65,535)
private long sampleRate; // 4 bytes unsigned, 0x00000001 (1) to 0xFFFFFFFF
// (4,294,967,295)
// Although a java int is 4 bytes, it is signed,
// so need to use a long
private int blockAlign; // 2 bytes unsigned, 0x0001 (1) to 0xFFFF (65,535)
private int validBits; // 2 bytes unsigned, 0x0002 (2) to 0xFFFF (65,535)
// Buffering
private byte[] buffer; // Local buffer used for IO
private int bufferPointer; // Points to the current position in local buffer
private int bytesRead; // Bytes read after last read into local buffer
private long frameCounter; // Current number of frames read or written
// Cannot instantiate WavFile directly, must either use newWavFile() or
// openWavFile()
private WavFile() {
buffer = new byte[BUFFER_SIZE];
}
public int getNumChannels() {
return numChannels;
}
public long getNumFrames() {
return numFrames;
}
public long getFramesRemaining() {
return numFrames - frameCounter;
}
public long getSampleRate() {
return sampleRate;
}
public int getValidBits() {
return validBits;
}
public static WavFile newWavFile(File file, int numChannels,
long numFrames, int validBits, long sampleRate) throws IOException,
WavFileException {
// Instantiate new Wavfile and initialise
WavFile wavFile = new WavFile();
wavFile.file = file;
wavFile.numChannels = numChannels;
wavFile.numFrames = numFrames;
wavFile.sampleRate = sampleRate;
wavFile.bytesPerSample = (validBits + 7) / 8;
wavFile.blockAlign = wavFile.bytesPerSample * numChannels;
wavFile.validBits = validBits;
// Sanity check arguments
if (numChannels < 1 || numChannels > 65535)
throw new WavFileException(
"Illegal number of channels, valid range 1 to 65536");
if (numFrames < 0)
throw new WavFileException("Number of frames must be positive");
if (validBits < 2 || validBits > 65535)
throw new WavFileException(
"Illegal number of valid bits, valid range 2 to 65536");
if (sampleRate < 0)
throw new WavFileException("Sample rate must be positive");
// Create output stream for writing data
wavFile.oStream = new FileOutputStream(file);
// Calculate the chunk sizes
long dataChunkSize = wavFile.blockAlign * numFrames;
long mainChunkSize = 4 + // Riff Type
8 + // Format ID and size
16 + // Format data
8 + // Data ID and size
dataChunkSize;
// Chunks must be word aligned, so if odd number of audio data bytes
// adjust the main chunk size
if (dataChunkSize % 2 == 1) {
mainChunkSize += 1;
wavFile.wordAlignAdjust = true;
} else {
wavFile.wordAlignAdjust = false;
}
// Set the main chunk size
putLE(RIFF_CHUNK_ID, wavFile.buffer, 0, 4);
putLE(mainChunkSize, wavFile.buffer, 4, 4);
putLE(RIFF_TYPE_ID, wavFile.buffer, 8, 4);
// Write out the header
wavFile.oStream.write(wavFile.buffer, 0, 12);
// Put format data in buffer
long averageBytesPerSecond = sampleRate * wavFile.blockAlign;
putLE(FMT_CHUNK_ID, wavFile.buffer, 0, 4); // Chunk ID
putLE(16, wavFile.buffer, 4, 4); // Chunk Data Size
putLE(1, wavFile.buffer, 8, 2); // Compression Code (Uncompressed)
putLE(numChannels, wavFile.buffer, 10, 2); // Number of channels
putLE(sampleRate, wavFile.buffer, 12, 4); // Sample Rate
putLE(averageBytesPerSecond, wavFile.buffer, 16, 4); // Average Bytes
// Per Second
putLE(wavFile.blockAlign, wavFile.buffer, 20, 2); // Block Align
putLE(validBits, wavFile.buffer, 22, 2); // Valid Bits
// Write Format Chunk
wavFile.oStream.write(wavFile.buffer, 0, 24);
// Start Data Chunk
putLE(DATA_CHUNK_ID, wavFile.buffer, 0, 4); // Chunk ID
putLE(dataChunkSize, wavFile.buffer, 4, 4); // Chunk Data Size
// Write Format Chunk
wavFile.oStream.write(wavFile.buffer, 0, 8);
// Calculate the scaling factor for converting to a normalised double
if (wavFile.validBits > 8) {
// If more than 8 validBits, data is signed
// Conversion required multiplying by magnitude of max positive
// value
wavFile.floatOffset = 0;
wavFile.floatScale = Long.MAX_VALUE >> (64 - wavFile.validBits);
} else {
// Else if 8 or less validBits, data is unsigned
// Conversion required dividing by max positive value
wavFile.floatOffset = 1;
wavFile.floatScale = 0.5 * ((1 << wavFile.validBits) - 1);
}
// Finally, set the IO State
wavFile.bufferPointer = 0;
wavFile.bytesRead = 0;
wavFile.frameCounter = 0;
wavFile.ioState = IOState.WRITING;
return wavFile;
}
public static WavFile openWavFile(File file) throws IOException,
WavFileException {
// Instantiate new Wavfile and store the file reference
WavFile wavFile = new WavFile();
wavFile.file = file;
// Create a new file input stream for reading file data
wavFile.iStream = new FileInputStream(file);
// Read the first 12 bytes of the file
int bytesRead = wavFile.iStream.read(wavFile.buffer, 0, 12);
if (bytesRead != 12)
throw new WavFileException("Not enough wav file bytes for header");
// Extract parts from the header
long riffChunkID = getLE(wavFile.buffer, 0, 4);
long chunkSize = getLE(wavFile.buffer, 4, 4);
long riffTypeID = getLE(wavFile.buffer, 8, 4);
// Check the header bytes contains the correct signature
if (riffChunkID != RIFF_CHUNK_ID)
throw new WavFileException(
"Invalid Wav Header data, incorrect riff chunk ID");
if (riffTypeID != RIFF_TYPE_ID)
throw new WavFileException(
"Invalid Wav Header data, incorrect riff type ID");
// Check that the file size matches the number of bytes listed in header
if (file.length() != chunkSize + 8) {
throw new WavFileException("Header chunk size (" + chunkSize
+ ") does not match file size (" + file.length() + ")");
}
boolean foundFormat = false;
boolean foundData = false;
// Search for the Format and Data Chunks
while (true) {
// Read the first 8 bytes of the chunk (ID and chunk size)
bytesRead = wavFile.iStream.read(wavFile.buffer, 0, 8);
if (bytesRead == -1)
throw new WavFileException(
"Reached end of file without finding format chunk");
if (bytesRead != 8)
throw new WavFileException("Could not read chunk header");
// Extract the chunk ID and Size
long chunkID = getLE(wavFile.buffer, 0, 4);
chunkSize = getLE(wavFile.buffer, 4, 4);
// Word align the chunk size
// chunkSize specifies the number of bytes holding data. However,
// the data should be word aligned (2 bytes) so we need to calculate
// the actual number of bytes in the chunk
long numChunkBytes = (chunkSize % 2 == 1) ? chunkSize + 1
: chunkSize;
if (chunkID == FMT_CHUNK_ID) {
// Flag that the format chunk has been found
foundFormat = true;
// Read in the header info
bytesRead = wavFile.iStream.read(wavFile.buffer, 0, 16);
// Check this is uncompressed data
int compressionCode = (int) getLE(wavFile.buffer, 0, 2);
if (compressionCode != 1)
throw new WavFileException("Compression Code "
+ compressionCode + " not supported");
// Extract the format information
wavFile.numChannels = (int) getLE(wavFile.buffer, 2, 2);
wavFile.sampleRate = getLE(wavFile.buffer, 4, 4);
wavFile.blockAlign = (int) getLE(wavFile.buffer, 12, 2);
wavFile.validBits = (int) getLE(wavFile.buffer, 14, 2);
if (wavFile.numChannels == 0)
throw new WavFileException(
"Number of channels specified in header is equal to zero");
if (wavFile.blockAlign == 0)
throw new WavFileException(
"Block Align specified in header is equal to zero");
if (wavFile.validBits < 2)
throw new WavFileException(
"Valid Bits specified in header is less than 2");
if (wavFile.validBits > 64)
throw new WavFileException(
"Valid Bits specified in header is greater than 64, this is greater than a long can hold");
// Calculate the number of bytes required to hold 1 sample
wavFile.bytesPerSample = (wavFile.validBits + 7) / 8;
if (wavFile.bytesPerSample * wavFile.numChannels != wavFile.blockAlign)
throw new WavFileException(
"Block Align does not agree with bytes required for validBits and number of channels");
// Account for number of format bytes and then skip over
// any extra format bytes
numChunkBytes -= 16;
if (numChunkBytes > 0)
wavFile.iStream.skip(numChunkBytes);
} else if (chunkID == DATA_CHUNK_ID) {
// Check if we've found the format chunk,
// If not, throw an exception as we need the format information
// before we can read the data chunk
if (foundFormat == false)
throw new WavFileException(
"Data chunk found before Format chunk");
// Check that the chunkSize (wav data length) is a multiple of
// the
// block align (bytes per frame)
if (chunkSize % wavFile.blockAlign != 0)
throw new WavFileException(
"Data Chunk size is not multiple of Block Align");
// Calculate the number of frames
wavFile.numFrames = chunkSize / wavFile.blockAlign;
// Flag that we've found the wave data chunk
foundData = true;
break;
} else {
// If an unknown chunk ID is found, just skip over the chunk
// data
wavFile.iStream.skip(numChunkBytes);
}
}
// Throw an exception if no data chunk has been found
if (foundData == false)
throw new WavFileException("Did not find a data chunk");
// Calculate the scaling factor for converting to a normalised double
if (wavFile.validBits > 8) {
// If more than 8 validBits, data is signed
// Conversion required dividing by magnitude of max negative value
wavFile.floatOffset = 0;
wavFile.floatScale = 1 << (wavFile.validBits - 1);
} else {
// Else if 8 or less validBits, data is unsigned
// Conversion required dividing by max positive value
wavFile.floatOffset = -1;
wavFile.floatScale = 0.5 * ((1 << wavFile.validBits) - 1);
}
wavFile.bufferPointer = 0;
wavFile.bytesRead = 0;
wavFile.frameCounter = 0;
wavFile.ioState = IOState.READING;
return wavFile;
}
// Get and Put little endian data from local buffer
// ------------------------------------------------
private static long getLE(byte[] buffer, int pos, int numBytes) {
numBytes--;
pos += numBytes;
long val = buffer[pos] & 0xFF;
for (int b = 0; b < numBytes; b++)
val = (val << 8) + (buffer[--pos] & 0xFF);
return val;
}
private static void putLE(long val, byte[] buffer, int pos, int numBytes) {
for (int b = 0; b < numBytes; b++) {
buffer[pos] = (byte) (val & 0xFF);
val >>= 8;
pos++;
}
}
// Sample Writing and Reading
// --------------------------
private void writeSample(long val) throws IOException {
for (int b = 0; b < bytesPerSample; b++) {
if (bufferPointer == BUFFER_SIZE) {
oStream.write(buffer, 0, BUFFER_SIZE);
bufferPointer = 0;
}
buffer[bufferPointer] = (byte) (val & 0xFF);
val >>= 8;
bufferPointer++;
}
}
private long readSample() throws IOException, WavFileException {
long val = 0;
for (int b = 0; b < bytesPerSample; b++) {
if (bufferPointer == bytesRead) {
int read = iStream.read(buffer, 0, BUFFER_SIZE);
if (read == -1)
throw new WavFileException("Not enough data available");
bytesRead = read;
bufferPointer = 0;
}
int v = buffer[bufferPointer];
if (b < bytesPerSample - 1 || bytesPerSample == 1)
v &= 0xFF;
val += v << (b * 8);
bufferPointer++;
}
return val;
}
// Integer
// -------
public int readFrames(int[] sampleBuffer, int numFramesToRead)
throws IOException, WavFileException {
return readFrames(sampleBuffer, 0, numFramesToRead);
}
public int readFrames(int[] sampleBuffer, int offset, int numFramesToRead)
throws IOException, WavFileException {
if (ioState != IOState.READING)
throw new IOException("Cannot read from WavFile instance");
for (int f = 0; f < numFramesToRead; f++) {
if (frameCounter == numFrames)
return f;
for (int c = 0; c < numChannels; c++) {
sampleBuffer[offset] = (int) readSample();
offset++;
}
frameCounter++;
}
return numFramesToRead;
}
public int readFrames(int[][] sampleBuffer, int numFramesToRead)
throws IOException, WavFileException {
return readFrames(sampleBuffer, 0, numFramesToRead);
}
public int readFrames(int[][] sampleBuffer, int offset, int numFramesToRead)
throws IOException, WavFileException {
if (ioState != IOState.READING)
throw new IOException("Cannot read from WavFile instance");
for (int f = 0; f < numFramesToRead; f++) {
if (frameCounter == numFrames)
return f;
for (int c = 0; c < numChannels; c++)
sampleBuffer[c][offset] = (int) readSample();
offset++;
frameCounter++;
}
return numFramesToRead;
}
public int writeFrames(int[] sampleBuffer, int numFramesToWrite)
throws IOException, WavFileException {
return writeFrames(sampleBuffer, 0, numFramesToWrite);
}
public int writeFrames(int[] sampleBuffer, int offset, int numFramesToWrite)
throws IOException, WavFileException {
if (ioState != IOState.WRITING)
throw new IOException("Cannot write to WavFile instance");
for (int f = 0; f < numFramesToWrite; f++) {
if (frameCounter == numFrames)
return f;
for (int c = 0; c < numChannels; c++) {
writeSample(sampleBuffer[offset]);
offset++;
}
frameCounter++;
}
return numFramesToWrite;
}
public int writeFrames(int[][] sampleBuffer, int numFramesToWrite)
throws IOException, WavFileException {
return writeFrames(sampleBuffer, 0, numFramesToWrite);
}
public int writeFrames(int[][] sampleBuffer, int offset,
int numFramesToWrite) throws IOException, WavFileException {
if (ioState != IOState.WRITING)
throw new IOException("Cannot write to WavFile instance");
for (int f = 0; f < numFramesToWrite; f++) {
if (frameCounter == numFrames)
return f;
for (int c = 0; c < numChannels; c++)
writeSample(sampleBuffer[c][offset]);
offset++;
frameCounter++;
}
return numFramesToWrite;
}
// Long
// ----
public int readFrames(long[] sampleBuffer, int numFramesToRead)
throws IOException, WavFileException {
return readFrames(sampleBuffer, 0, numFramesToRead);
}
public int readFrames(long[] sampleBuffer, int offset, int numFramesToRead)
throws IOException, WavFileException {
if (ioState != IOState.READING)
throw new IOException("Cannot read from WavFile instance");
for (int f = 0; f < numFramesToRead; f++) {
if (frameCounter == numFrames)
return f;
for (int c = 0; c < numChannels; c++) {
sampleBuffer[offset] = readSample();
offset++;
}
frameCounter++;
}
return numFramesToRead;
}
public int readFrames(long[][] sampleBuffer, int numFramesToRead)
throws IOException, WavFileException {
return readFrames(sampleBuffer, 0, numFramesToRead);
}
public int readFrames(long[][] sampleBuffer, int offset, int numFramesToRead)
throws IOException, WavFileException {
if (ioState != IOState.READING)
throw new IOException("Cannot read from WavFile instance");
for (int f = 0; f < numFramesToRead; f++) {
if (frameCounter == numFrames)
return f;
for (int c = 0; c < numChannels; c++)
sampleBuffer[c][offset] = readSample();
offset++;
frameCounter++;
}
return numFramesToRead;
}
public int writeFrames(long[] sampleBuffer, int numFramesToWrite)
throws IOException, WavFileException {
return writeFrames(sampleBuffer, 0, numFramesToWrite);
}
public int writeFrames(long[] sampleBuffer, int offset, int numFramesToWrite)
throws IOException, WavFileException {
if (ioState != IOState.WRITING)
throw new IOException("Cannot write to WavFile instance");
for (int f = 0; f < numFramesToWrite; f++) {
if (frameCounter == numFrames)
return f;
for (int c = 0; c < numChannels; c++) {
writeSample(sampleBuffer[offset]);
offset++;
}
frameCounter++;
}
return numFramesToWrite;
}
public int writeFrames(long[][] sampleBuffer, int numFramesToWrite)
throws IOException, WavFileException {
return writeFrames(sampleBuffer, 0, numFramesToWrite);
}
public int writeFrames(long[][] sampleBuffer, int offset,
int numFramesToWrite) throws IOException, WavFileException {
if (ioState != IOState.WRITING)
throw new IOException("Cannot write to WavFile instance");
for (int f = 0; f < numFramesToWrite; f++) {
if (frameCounter == numFrames)
return f;
for (int c = 0; c < numChannels; c++)
writeSample(sampleBuffer[c][offset]);
offset++;
frameCounter++;
}
return numFramesToWrite;
}
// Double
// ------
public int readFrames(double[] sampleBuffer, int numFramesToRead)
throws IOException, WavFileException {
return readFrames(sampleBuffer, 0, numFramesToRead);
}
public int readFrames(double[] sampleBuffer, int offset, int numFramesToRead)
throws IOException, WavFileException {
if (ioState != IOState.READING)
throw new IOException("Cannot read from WavFile instance");
for (int f = 0; f < numFramesToRead; f++) {
if (frameCounter == numFrames)
return f;
for (int c = 0; c < numChannels; c++) {
sampleBuffer[offset] = floatOffset + (double) readSample()
/ floatScale;
offset++;
}
frameCounter++;
}
return numFramesToRead;
}
public int readFrames(double[][] sampleBuffer, int numFramesToRead)
throws IOException, WavFileException {
return readFrames(sampleBuffer, 0, numFramesToRead);
}
public int readFrames(double[][] sampleBuffer, int offset,
int numFramesToRead) throws IOException, WavFileException {
if (ioState != IOState.READING)
throw new IOException("Cannot read from WavFile instance");
for (int f = 0; f < numFramesToRead; f++) {
if (frameCounter == numFrames)
return f;
for (int c = 0; c < numChannels; c++)
sampleBuffer[c][offset] = floatOffset + (double) readSample()
/ floatScale;
offset++;
frameCounter++;
}
return numFramesToRead;
}
public int writeFrames(double[] sampleBuffer, int numFramesToWrite)
throws IOException, WavFileException {
return writeFrames(sampleBuffer, 0, numFramesToWrite);
}
public int writeFrames(double[] sampleBuffer, int offset,
int numFramesToWrite) throws IOException, WavFileException {
if (ioState != IOState.WRITING)
throw new IOException("Cannot write to WavFile instance");
for (int f = 0; f < numFramesToWrite; f++) {
if (frameCounter == numFrames)
return f;
for (int c = 0; c < numChannels; c++) {
writeSample((long) (floatScale * (floatOffset + sampleBuffer[offset])));
offset++;
}
frameCounter++;
}
return numFramesToWrite;
}
public int writeFrames(double[][] sampleBuffer, int numFramesToWrite)
throws IOException, WavFileException {
return writeFrames(sampleBuffer, 0, numFramesToWrite);
}
public int writeFrames(double[][] sampleBuffer, int offset,
int numFramesToWrite) throws IOException, WavFileException {
if (ioState != IOState.WRITING)
throw new IOException("Cannot write to WavFile instance");
for (int f = 0; f < numFramesToWrite; f++) {
if (frameCounter == numFrames)
return f;
for (int c = 0; c < numChannels; c++)
writeSample((long) (floatScale * (floatOffset + sampleBuffer[c][offset])));
offset++;
frameCounter++;
}
return numFramesToWrite;
}
public void close() throws IOException {
// Close the input stream and set to null
if (iStream != null) {
iStream.close();
iStream = null;
}
if (oStream != null) {
// Write out anything still in the local buffer
if (bufferPointer > 0)
oStream.write(buffer, 0, bufferPointer);
// If an extra byte is required for word alignment, add it to the
// end
if (wordAlignAdjust)
oStream.write(0);
// Close the stream and set to null
oStream.close();
oStream = null;
}
// Flag that the stream is closed
ioState = IOState.CLOSED;
}
public void display() {
display(System.out);
}
public void display(PrintStream out) {
out.printf("File: %s\n", file);
out.printf("Channels: %d, Frames: %d\n", numChannels, numFrames);
out.printf("IO State: %s\n", ioState);
out.printf("Sample Rate: %d, Block Align: %d\n", sampleRate, blockAlign);
out.printf("Valid Bits: %d, Bytes per sample: %d\n", validBits,
bytesPerSample);
}
public static void main(String[] args) {
if (args.length < 1) {
System.err.println("Must supply filename");
System.exit(1);
}
try {
for (String filename : args) {
WavFile readWavFile = openWavFile(new File(filename));
readWavFile.display();
long numFrames = readWavFile.getNumFrames();
int numChannels = readWavFile.getNumChannels();
int validBits = readWavFile.getValidBits();
long sampleRate = readWavFile.getSampleRate();
WavFile writeWavFile = newWavFile(new File("out.wav"),
numChannels, numFrames, validBits, sampleRate);
final int BUF_SIZE = 5001;
// int[] buffer = new int[BUF_SIZE * numChannels];
// long[] buffer = new long[BUF_SIZE * numChannels];
double[] buffer = new double[BUF_SIZE * numChannels];
int framesRead = 0;
int framesWritten = 0;
do {
framesRead = readWavFile.readFrames(buffer, BUF_SIZE);
framesWritten = writeWavFile.writeFrames(buffer, BUF_SIZE);
System.out.printf("%d %d\n", framesRead, framesWritten);
} while (framesRead != 0);
readWavFile.close();
writeWavFile.close();
}
WavFile writeWavFile = newWavFile(new File("out2.wav"), 1, 10, 23,
44100);
double[] buffer = new double[10];
writeWavFile.writeFrames(buffer, 10);
writeWavFile.close();
} catch (Exception e) {
System.err.println(e);
e.printStackTrace();
}
}
}
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