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/*
* Copyright 2011 Phil Burk, Mobileer Inc
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.jsyn.util;
import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.net.URL;
import javax.sound.sampled.AudioFormat;
import javax.sound.sampled.AudioInputStream;
import javax.sound.sampled.AudioSystem;
import javax.sound.sampled.UnsupportedAudioFileException;
import com.jsyn.data.FloatSample;
/**
* Internal class for loading audio samples. Use SampleLoader instead.
*
* @author Phil Burk (C) 2011 Mobileer Inc
*/
class JavaSoundSampleLoader implements AudioSampleLoader {
/**
* Load a FloatSample from a File object.
*/
@Override
public FloatSample loadFloatSample(File fileIn) throws IOException {
try {
return loadFloatSample(AudioSystem.getAudioInputStream(fileIn));
} catch (UnsupportedAudioFileException e) {
throw new IOException(e);
}
}
/**
* Load a FloatSample from an InputStream. This is handy when loading Resources from a JAR file.
*/
@Override
public FloatSample loadFloatSample(InputStream inputStream) throws IOException {
try {
return loadFloatSample(AudioSystem.getAudioInputStream(inputStream));
} catch (UnsupportedAudioFileException e) {
throw new IOException(e);
}
}
/**
* Load a FloatSample from a URL.. This is handy when loading Resources from a website.
*/
@Override
public FloatSample loadFloatSample(URL url) throws IOException {
try {
return loadFloatSample(AudioSystem.getAudioInputStream(url));
} catch (UnsupportedAudioFileException e) {
throw new IOException(e);
}
}
private FloatSample loadFloatSample(javax.sound.sampled.AudioInputStream audioInputStream)
throws IOException, UnsupportedAudioFileException {
float[] floatData = null;
FloatSample sample = null;
int bytesPerFrame = audioInputStream.getFormat().getFrameSize();
if (bytesPerFrame == AudioSystem.NOT_SPECIFIED) {
// some audio formats may have unspecified frame size
// in that case we may read any amount of bytes
bytesPerFrame = 1;
}
AudioFormat format = audioInputStream.getFormat();
if (format.getEncoding() == AudioFormat.Encoding.PCM_SIGNED) {
floatData = loadSignedPCM(audioInputStream);
}
sample = new FloatSample(floatData, format.getChannels());
sample.setFrameRate(format.getFrameRate());
return sample;
}
private float[] loadSignedPCM(AudioInputStream audioInputStream) throws IOException,
UnsupportedAudioFileException {
int totalSamplesRead = 0;
AudioFormat format = audioInputStream.getFormat();
int numFrames = (int) audioInputStream.getFrameLength();
int numSamples = format.getChannels() * numFrames;
float[] data = new float[numSamples];
final int bytesPerFrame = format.getFrameSize();
// Set an arbitrary buffer size of 1024 frames.
int numBytes = 1024 * bytesPerFrame;
byte[] audioBytes = new byte[numBytes];
int numBytesRead = 0;
int numFramesRead = 0;
// Try to read numBytes bytes from the file.
while ((numBytesRead = audioInputStream.read(audioBytes)) != -1) {
int bytesRemainder = numBytesRead % bytesPerFrame;
if (bytesRemainder != 0) {
// TODO Read until you get enough data.
throw new IOException("Read partial block of sample data!");
}
if (audioInputStream.getFormat().getSampleSizeInBits() == 16) {
if (format.isBigEndian()) {
SampleLoader.decodeBigI16ToF32(audioBytes, 0, numBytesRead, data,
totalSamplesRead);
} else {
SampleLoader.decodeLittleI16ToF32(audioBytes, 0, numBytesRead, data,
totalSamplesRead);
}
} else if (audioInputStream.getFormat().getSampleSizeInBits() == 24) {
if (format.isBigEndian()) {
SampleLoader.decodeBigI24ToF32(audioBytes, 0, numBytesRead, data,
totalSamplesRead);
} else {
SampleLoader.decodeLittleI24ToF32(audioBytes, 0, numBytesRead, data,
totalSamplesRead);
}
} else if (audioInputStream.getFormat().getSampleSizeInBits() == 32) {
if (format.isBigEndian()) {
SampleLoader.decodeBigI32ToF32(audioBytes, 0, numBytesRead, data,
totalSamplesRead);
} else {
SampleLoader.decodeLittleI32ToF32(audioBytes, 0, numBytesRead, data,
totalSamplesRead);
}
} else {
throw new UnsupportedAudioFileException(
"Only 16, 24 or 32 bit PCM samples supported.");
}
// Calculate the number of frames actually read.
numFramesRead = numBytesRead / bytesPerFrame;
totalSamplesRead += numFramesRead * format.getChannels();
}
return data;
}
}
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