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/*
This file is part of Subsonic.
Subsonic 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 3 of the License, or
(at your option) any later version.
Subsonic 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 Subsonic. If not, see <http://www.gnu.org/licenses/>.
Copyright 2009 (C) Sindre Mehus
*/
package net.sourceforge.subsonic.io;
import net.sourceforge.subsonic.*;
import org.apache.commons.io.*;
import java.io.*;
/**
* Subclass of {@link InputStream} which provides on-the-fly transcoding.
* Instances of <code>TranscodeInputStream</code> can be chained together, for instance to convert
* from OGG to WAV to MP3.
*
* @author Sindre Mehus
*/
public class TranscodeInputStream extends InputStream {
private static final Logger LOG = Logger.getLogger(TranscodeInputStream.class);
private InputStream processInputStream;
private OutputStream processOutputStream;
private Process process;
private final File tmpFile;
/**
* Creates a transcoded input stream by executing an external process. If <code>in</code> is not null,
* data from it is copied to the command.
*
* @param processBuilder Used to create the external process.
* @param in Data to feed to the process. May be {@code null}.
* @param tmpFile Temporary file to delete when this stream is closed. May be {@code null}.
* @throws IOException If an I/O error occurs.
*/
public TranscodeInputStream(ProcessBuilder processBuilder, final InputStream in, File tmpFile) throws IOException {
this.tmpFile = tmpFile;
StringBuffer buf = new StringBuffer("Starting transcoder: ");
for (String s : processBuilder.command()) {
buf.append('[').append(s).append("] ");
}
LOG.debug(buf);
process = processBuilder.start();
processOutputStream = process.getOutputStream();
processInputStream = process.getInputStream();
// Must read stderr from the process, otherwise it may block.
final String name = processBuilder.command().get(0);
new InputStreamReaderThread(process.getErrorStream(), name, true).start();
// Copy data in a separate thread
if (in != null) {
new Thread(name + " TranscodedInputStream copy thread") {
public void run() {
try {
IOUtils.copy(in, processOutputStream);
} catch (IOException x) {
// Intentionally ignored. Will happen if the remote player closes the stream.
} finally {
IOUtils.closeQuietly(in);
IOUtils.closeQuietly(processOutputStream);
}
}
}.start();
}
}
/**
* @see InputStream#read()
*/
public int read() throws IOException {
return processInputStream.read();
}
/**
* @see InputStream#read(byte[])
*/
public int read(byte[] b) throws IOException {
return processInputStream.read(b);
}
/**
* @see InputStream#read(byte[], int, int)
*/
public int read(byte[] b, int off, int len) throws IOException {
return processInputStream.read(b, off, len);
}
/**
* @see InputStream#close()
*/
public void close() throws IOException {
IOUtils.closeQuietly(processInputStream);
IOUtils.closeQuietly(processOutputStream);
if (process != null) {
process.destroy();
}
if (tmpFile != null) {
if (!tmpFile.delete()) {
LOG.warn("Failed to delete tmp file: " + tmpFile);
}
}
}
}
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