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Open Source (LGPL) JavaFX PDF Viewer for NetBeans plugin
/*
* ===========================================
* Java Pdf Extraction Decoding Access Library
* ===========================================
*
* Project Info: http://www.idrsolutions.com
* Help section for developers at http://www.idrsolutions.com/support/
*
* (C) Copyright 1997-2017 IDRsolutions and Contributors.
*
* This file is part of JPedal/JPDF2HTML5
*
@LICENSE@
*
* ---------------
* SoundHandler.java
* ---------------
*/
package org.jpedal.objects.acroforms.actions;
import java.io.ByteArrayInputStream;
import java.io.IOException;
import javax.sound.sampled.*;
import org.jpedal.objects.raw.PdfDictionary;
import org.jpedal.utils.LogWriter;
public class SoundHandler {
private static final int EXTERNAL_BUFFER_SIZE = 128000;
private static int frameSize;
private static float sampleRate = 44100F;
private static int sampleSizeInBits = 16;
private static int channels = 2;
private static AudioFormat.Encoding encoding = AudioFormat.Encoding.PCM_SIGNED;
public static void setAudioFormat(final int audioFormat, final int b, final float r, final int c) {
sampleSizeInBits = b;
sampleRate = r;
channels = c;
if (audioFormat != PdfDictionary.Signed) {
if (audioFormat == PdfDictionary.Unsigned) {
encoding = AudioFormat.Encoding.PCM_UNSIGNED;
} else {
throw new RuntimeException("AudioFormat currently unsupported! - ");
}
}
}
private static AudioFormat getAudioFormat() {
/* frame size = sample size in *bytes* multiplied by channels */
frameSize = (sampleSizeInBits / 8) * channels;
/*
* not sure how to calculate frame rate but saw some other files
* where it was just the same as sample rate, and in the cases I have
* seen it seems to work
*/
final int frameRate = (int) sampleRate;
/*
* according to the PDF Spec (pg 740) samples larger than 8 bits are
* big endian
*/
/*
* also works, but would probably need the big constructor to handle
* different types of encoding other than Signed and Unsigned
*/
//AudioFormat audioFormat = new AudioFormat(sampleRate, sampleSizeInBits,
// channels, true, true);
return new AudioFormat(encoding, sampleRate, sampleSizeInBits, channels, frameSize, frameRate, true);
}
public static AudioInputStream getAudioInputStream(final byte[] data) {
final AudioFormat audioFormat = getAudioFormat();
final long length = data.length / frameSize;
return new AudioInputStream(
new ByteArrayInputStream(data),
audioFormat, length);
}
public static void PlaySound(final byte[] data) throws Exception {
final AudioFormat audioFormat = getAudioFormat();
/*
* not massively convinced if this is the correct formula for calculating
* the length, it works for a couple of files though, so may be right.
*/
final long length = data.length / frameSize;
final AudioInputStream ais = new AudioInputStream(
new ByteArrayInputStream(data),
audioFormat, length);
playSoundFromStream(ais);
}
private static void playSoundFromStream(final AudioInputStream ais) {
SourceDataLine line = null;
final DataLine.Info info = new DataLine.Info(SourceDataLine.class, ais.getFormat());
try {
line = (SourceDataLine) AudioSystem.getLine(info);
line.open(ais.getFormat());
} catch (final Exception e) {
LogWriter.writeLog("Exception: " + e.getMessage());
}
line.start();
int nBytesRead = 0;
final byte[] abData = new byte[EXTERNAL_BUFFER_SIZE];
while (nBytesRead != -1) {
try {
nBytesRead = ais.read(abData, 0, abData.length);
} catch (final IOException e) {
LogWriter.writeLog("Exception: " + e.getMessage());
}
if (nBytesRead >= 0) {
// do not comment out this line -> (no code == no sound)
line.write(abData, 0, nBytesRead);
}
}
line.drain();
line.close();
}
}