/*
*
* Copyright (c) 2006-2007 Paul John Leonard
*
* http://www.frinika.com
*
* This file is part of Frinika.
*
* Frinika 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 2 of the License, or
* (at your option) any later version.
*
* Frinika 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 Frinika; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
/*
* Created on Jul 18, 2006
*
*
* Based on code from
* http://www.jensign.com/JavaScience/www/mmedia/riffread/riffread.java
* by M. Gallant 2/14/97
*
*Mods by pjl
*
* This file is part of Frinika.
*
* Frinika 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 2 of the License, or
* (at your option) any later version.
* Frinika 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 Frinika; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
package com.frinika.sequencer.model.audio;
import java.io.IOException;
import java.io.RandomAccessFile;
import javax.sound.sampled.AudioFormat;
/**
* Wraps up a wav file and allows access using a RandomAccessFile.
* provides a view of the file that allows reads before the start and after the end of the file
* you'll just get zeros returned.
*
* @deprecated
*/
public class DAudioReader {
static String sp = " "; // spacer string.
static String indent = sp + " ";
private long audioDataStartBytePtr; // start of audio data in bytes
private int audioDataByteLength; // number of bytes of audio
private int lengthInFrames;
private RandomAccessFile fis;
private int bytecount = 0;
private int riffdata = 0; // size of RIFF data chunk.
private AudioFormat format;
int nChannels;
// Used to point to current read position
// bytes from the start of audio datat in the file
// NOT THE START OF THE FILE (see audioDataStartBytePtr)
private long fPtrBytes;
public DAudioReader(RandomAccessFile fis) throws IOException {
String sfield = "";
this.fis = fis;
long filesize = (fis.length()); // get file
readChunkHeader();
while (bytecount < riffdata) { // check for chunks inside RIFF data
// area.
sfield = "";
for (int i = 1; i <= 4; i++)
sfield += (char) fis.readByte();
int chunkSize = 0;
for (int i = 0; i < 4; i++)
chunkSize += fis.readUnsignedByte() * (int) Math.pow(256, i);
if (sfield.equals("data")) {
audioDataStartBytePtr = fis.getFilePointer();
// System. out.println(" Audio offset " + audioDataStartBytePtr);
audioDataByteLength = (int) (filesize - audioDataStartBytePtr);
}
bytecount += (8 + chunkSize);
if (sfield.equals("fmt ")) { // extract info from "format"
readFormat(chunkSize);
} else
// if NOT the fmt chunk.
fis.skipBytes(chunkSize);
lengthInFrames = chunkSize / format.getFrameSize();
// System .out.println(lengthInFrames + " " + audioDataByteLength
// + " " + format.getFrameSize());
} // end while.
if ((8 + bytecount) != (int) filesize)
System.out.println(sp
+ "!!!!!!! Problem with file structure !!!!!!!!! ");
} // end try.
private void readChunkHeader() throws IOException {
String sfield = "";
int chunkSize = 0;
/* -------- Get RIFF chunk header --------- */
for (int i = 1; i <= 4; i++)
sfield += (char) fis.readByte();
if (!sfield.equals("RIFF")) {
System.out.println(" **** Not a valid RIFF file ****");
return;
}
for (int i = 0; i < 4; i++)
chunkSize += fis.readUnsignedByte() * (int) Math.pow(256, i);
sfield = "";
for (int i = 1; i <= 4; i++)
sfield += (char) fis.readByte();
// System. out.println(sp + " ----- form type: " + sfield + "\n");
riffdata = chunkSize;
/* --------------------------------------------- */
bytecount = 4; // initialize bytecount to include RIFF form-type
// bytes.
}
/*
* This returns the number of frames (my frame all the data for a sample)
*/
public int getLengthInFrames() {
return lengthInFrames;
}
private void readFormat(int chunkSize) throws IOException {
// chunk.
if (chunkSize < 16) {
System.out.println(" **** Not a valid fmt chunk ****");
return;
}
int wFormatTag = fis.readUnsignedByte();
fis.skipBytes(1);
// if (wFormatTag == 1)
// System.out.println(indent + "wFormatTag: MS PCM format");
// else
// System.out.println(indent + "wFormatTag: non-PCM format");
nChannels = fis.readUnsignedByte();
fis.skipBytes(1);
// System.out.println(indent + "nChannels: " + nChannels);
int nSamplesPerSec = 0;
for (int i = 0; i < 4; i++)
nSamplesPerSec += fis.readUnsignedByte() * (int) Math.pow(256, i);
// System.out.println(indent + "nSamplesPerSec: " + nSamplesPerSec);
int nAvgBytesPerSec = 0;
for (int i = 0; i < 4; i++)
nAvgBytesPerSec += fis.readUnsignedByte() * (int) Math.pow(256, i);
// System.out.println(indent + "nAvgBytesPerSec: " + nAvgBytesPerSec);
int nBlockAlign = 0;
for (int i = 0; i < 2; i++)
nBlockAlign += fis.readUnsignedByte() * (int) Math.pow(256, i);
// System.out.println(indent + "nBlockAlign: " + nBlockAlign);
int nBitsPerSample = 0;
if (wFormatTag == 1) { // if MS PCM format
nBitsPerSample = fis.readUnsignedByte();
fis.skipBytes(1);
// System.out.println(indent + "nBitsPerSample: " + nBitsPerSample);
} else
fis.skipBytes(2);
fis.skipBytes(chunkSize - 16); // skip over any extra bytes
// in format specific field.
// Assume 16 bit signed little endian.
format = new AudioFormat(nSamplesPerSec, nBitsPerSample, nChannels,
true, false);
}
public AudioFormat getFormat() {
return format;
}
/**
*
*
* @param framePos
* frame postition reltive to start of audio. e.g. zero is start of audio.
*
* @throws IOException
*/
public void seekFrame(long framePos) throws IOException {
// pointer into audio data section
fPtrBytes = framePos * 2 * nChannels;
if (fPtrBytes >= 0) {
// Offset the seek into audio section
if (fPtrBytes < audioDataByteLength)
fis.seek(fPtrBytes + audioDataStartBytePtr);
} else {
// Seek to the start of audio section
fis.seek(audioDataStartBytePtr);
}
}
/**
*
*
* Read from file into byte buffer and advance the fPtrBytes pointer
* it is OK to read before/after start/end of the file you'll just get zeros.
*
* @param byteBuffer
* buffer to fill
* @param offSet
* offset into byteBuffer
* @param n
* number of bytes to be read
* @throws IOException
*/
public void read(byte[] byteBuffer, int offSet, int n) throws IOException {
if (fPtrBytes < 0) {
// If before start of data then only read
int nRead = (int) (n + fPtrBytes); // bytes of this read after
// start of audioData
if (nRead > 0) {
int nFill = n - nRead; // read into the last portion of the
// array
for (int i = 0; i < nFill; i++)
byteBuffer[i + offSet] = 0; // TODO array copy
fis.read(byteBuffer, offSet + nFill, nRead);
} else {
for (int i = 0; i < n; i++)
byteBuffer[i + offSet] = 0; // TODO array copy
}
} else if (fPtrBytes > audioDataByteLength) {
// After end of audio data
for (int i = 0; i < n; i++)
byteBuffer[i + offSet] = 0; // TODO array copy
} else {
int nExtra = (int) (fPtrBytes + n - audioDataByteLength);
if (nExtra > 0) {
// Some bytes after end of the audio section ?
int nRead = n - nExtra;
fis.read(byteBuffer, offSet, nRead);
for (int i = nRead; i < n ; i++)
byteBuffer[i + offSet] = 0; // TODO array copy
} else {
// all data in audio section
int nread=fis.read(byteBuffer, offSet, n);
if (nread != n)
try {
throw new Exception(" Ooops only read " + nread + " out of " + n + " " + offSet );
} catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
}
fPtrBytes += n;
}
public int getChannels() { return nChannels;}
public boolean eof() {
try {
return fPtrBytes-audioDataStartBytePtr >= fis.length();
} catch (IOException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
return true;
}
public long getCurrentFrame() {
return (fPtrBytes-audioDataStartBytePtr)/nChannels/2;
}
}