private InputStream getInputStream(
String urlStr, Format outputFormat, ContentDescriptor outputContentDescriptor)
throws Exception {
final ProcessorModel processorModel =
new ProcessorModel(
new MediaLocator(urlStr),
outputFormat == null ? null : new Format[] {outputFormat},
outputContentDescriptor);
final Processor processor = Manager.createRealizedProcessor(processorModel);
final DataSource ds = processor.getDataOutput();
final DataSink[] streamDataSinkHolder = new DataSink[] {null};
// connect the data output of the processor to a StreamDataSink, which
// will make the data available to PipedInputStream, which we return.
final PipedInputStream in =
new PipedInputStream() {
// override close to clean up everything when the media has been
// served.
@Override
public void close() throws IOException {
super.close();
logger.fine("Closed input stream");
logger.fine("Stopping processor");
processor.stop();
logger.fine("Closing processor");
processor.close();
logger.fine("Deallocating processor");
processor.deallocate();
if (streamDataSinkHolder[0] != null) {
logger.fine("Closing StreamDataSink");
streamDataSinkHolder[0].close();
}
}
};
final PipedOutputStream out = new PipedOutputStream(in);
final DataSink streamDataSink = new StreamDataSink(out);
streamDataSinkHolder[0] = streamDataSink;
streamDataSink.setSource(ds);
streamDataSink.open();
streamDataSink.start();
logger.info("Starting processor");
processor.start();
// TODO: if there is an error, make sure we clean up.
// for example, if the client breaks the connection.
// we need a controller listener to listen for errors.
return in;
}
