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Freedom for Media in Java
package net.sf.fmj.media.parser;
import java.io.*;
import java.util.*;
import java.util.logging.*;
import javax.media.*;
import javax.media.protocol.*;
import net.sf.fmj.media.*;
import net.sf.fmj.utility.*;
import org.xml.sax.*;
import org.xml.sax.helpers.*;
import com.lti.utils.*;
import com.lti.utils.synchronization.*;
/**
* Parser for FMJ's XML movie format.
*
* @author Ken Larson
*
*/
public class XmlMovieParser extends AbstractDemultiplexer
{
private abstract class PullSourceStreamTrack extends AbstractTrack
{
public abstract void deallocate();
}
private class VideoTrack extends PullSourceStreamTrack
{
// TODO: track listener
private final int track;
private final Format format;
public VideoTrack(int track, Format format)
throws ResourceUnavailableException
{
super();
this.track = track;
this.format = format;
}
@Override
public void deallocate()
{
}
@Override
public Time getDuration()
{
return Duration.DURATION_UNKNOWN; // TODO
}
@Override
public Format getFormat()
{
return format;
}
@Override
public Time mapFrameToTime(int frameNumber)
{
return TIME_UNKNOWN;
}
@Override
public int mapTimeToFrame(Time t)
{
return FRAME_UNKNOWN;
}
@Override
public void readFrame(Buffer buffer)
{
Buffer b;
try
{
b = xmlMovieSAXHandler.readBuffer(track);
} catch (SAXException e)
{
throw new RuntimeException(e);
} catch (IOException e)
{
throw new RuntimeException(e);
} catch (InterruptedException e)
{
throw new RuntimeException(e);
}
buffer.copy(b);
}
}
private static final Logger logger = LoggerSingleton.logger;
private ContentDescriptor[] supportedInputContentDescriptors = new ContentDescriptor[] { new ContentDescriptor(
"video.xml") };
private PullDataSource source;
private PullSourceStreamTrack[] tracks;
private XmlMovieSAXHandler xmlMovieSAXHandler;
private XmlMovieSAXParserThread xmlMovieSAXParserThread;
public XmlMovieParser()
{
super();
}
@Override
public void close()
{
if (tracks != null)
{
for (int i = 0; i < tracks.length; ++i)
{
if (tracks[i] != null)
{
tracks[i].deallocate();
tracks[i] = null;
}
}
tracks = null;
}
super.close();
}
@Override
public ContentDescriptor[] getSupportedInputContentDescriptors()
{
return supportedInputContentDescriptors;
}
@Override
public Track[] getTracks() throws IOException, BadHeaderException
{
return tracks;
}
@Override
public boolean isPositionable()
{
return false; // TODO
}
// TODO: should we stop data source in stop?
// // @Override
// public void stop()
// {
// try
// {
// source.stop();
// } catch (IOException e)
// {
// logger.log(Level.WARNING, "" + e, e);
// }
// }
@Override
public boolean isRandomAccess()
{
return super.isRandomAccess(); // TODO: can we determine this from the
// data source?
}
// @Override
// public Time setPosition(Time where, int rounding)
// {
// }
@Override
public void open() throws ResourceUnavailableException
{
try
{
// source.connect(); // TODO: assume source is already connected
source.start(); // TODO: stop/disconnect on stop/close.
final PullSourceStream[] streams = source.getStreams();
// only first stream supported.
if (streams.length > 1)
logger.warning("only 1 stream supported, " + streams.length
+ " found");
final InputStream is = new PullSourceStreamInputStream(streams[0]);
xmlMovieSAXHandler = new XmlMovieSAXHandler();
xmlMovieSAXParserThread = new XmlMovieSAXParserThread(
xmlMovieSAXHandler, is);
xmlMovieSAXParserThread.start(); // TODO: stop when done
Format[] formats = xmlMovieSAXHandler.readTracksInfo();
tracks = new PullSourceStreamTrack[formats.length];
for (int i = 0; i < formats.length; ++i)
{
tracks[i] = new VideoTrack(i, formats[i]);
}
} catch (IOException e)
{
logger.log(Level.WARNING, "" + e, e);
throw new ResourceUnavailableException("" + e);
} catch (SAXException e)
{
logger.log(Level.WARNING, "" + e, e);
throw new ResourceUnavailableException("" + e);
} catch (InterruptedException e)
{
logger.log(Level.WARNING, "" + e, e);
throw new ResourceUnavailableException("" + e);
}
super.open();
}
@Override
public void setSource(DataSource source) throws IOException,
IncompatibleSourceException
{
source.getLocator().getProtocol();
if (!(source instanceof PullDataSource))
throw new IncompatibleSourceException();
this.source = (PullDataSource) source;
}
// @Override
@Override
public void start() throws IOException
{
}
}
/**
* SAX callback for FMJ's XML movie format.
*
* @author Ken Larson
*
*/
class XmlMovieSAXHandler extends DefaultHandler
{
private static int getIntAttr(Attributes atts, String qName)
throws SAXException
{
final int index = atts.getIndex(qName);
if (index < 0)
throw new SAXException("Missing attribute: " + qName);
return getIntAttr(atts, qName, 0);
}
private static int getIntAttr(Attributes atts, String qName,
int defaultResult) throws SAXException
{
final int index = atts.getIndex(qName);
if (index < 0)
return defaultResult;
final String s = atts.getValue(index);
try
{
return Integer.parseInt(s);
} catch (NumberFormatException e)
{
throw new SAXException("Expected integer: " + s, e);
}
}
private static long getLongAttr(Attributes atts, String qName)
throws SAXException
{
final int index = atts.getIndex(qName);
if (index < 0)
throw new SAXException("Missing attribute: " + qName);
return getLongAttr(atts, qName, 0);
}
private static long getLongAttr(Attributes atts, String qName,
long defaultResult) throws SAXException
{
final int index = atts.getIndex(qName);
if (index < 0)
return defaultResult;
final String s = atts.getValue(index);
try
{
return Long.parseLong(s);
} catch (NumberFormatException e)
{
throw new SAXException("Expected long: " + s, e);
}
}
private static String getStringAttr(Attributes atts, String qName)
throws SAXException
{
final int index = atts.getIndex(qName);
if (index < 0)
throw new SAXException("Missing attribute: " + qName);
return getStringAttr(atts, qName, null);
}
private static String getStringAttr(Attributes atts, String qName,
String defaultResult) throws SAXException
{
final int index = atts.getIndex(qName);
if (index < 0)
return defaultResult;
final String s = atts.getValue(index);
return s;
}
private final ProducerConsumerQueue qMeta = new ProducerConsumerQueue();
private final Map qBuffers = new HashMap();
private final Map formatsMap = new HashMap();
private int currentTrack = -1;
private Buffer currentBuffer;
private StringBuilder currentDataChars;
private int state = INIT;
private static final int INIT = 0;
private static final int AWAIT_BUFFER = 10;
private static final int AWAIT_DATA = 11;
private static final int READ_DATA = 12;
@Override
public void characters(char[] ch, int start, int length)
throws SAXException
{
if (state == READ_DATA)
{
String s = new String(ch, start, length);
currentDataChars.append(s);
} else
{
String s = new String(ch, start, length);
s = s.trim();
if (s.length() > 0)
throw new SAXException("characters unexpected, state=" + state
+ " chars=" + s);
}
}
@Override
public void endDocument() throws SAXException
{
if (qBuffers != null)
{
for (ProducerConsumerQueue q : qBuffers.values())
{
if (q != null)
{
final Buffer eomBuffer = new Buffer();
eomBuffer.setEOM(true);
// TODO: set format/
try
{
q.put(eomBuffer);
} catch (InterruptedException e)
{
throw new SAXException(e);
}
}
}
}
}
@Override
public void endElement(String uri, String localName, String name)
throws SAXException
{
if (localName.equals("Tracks"))
{ // done with track info
if (formatsMap.size() == 0)
throw new SAXException("No tracks");
try
{
final Format[] formatsArray = new Format[formatsMap.size()];
for (int i = 0; i < formatsArray.length; ++i)
{
final Format format = formatsMap.get(i);
if (format == null)
throw new SAXException("Expected format for track " + i);
formatsArray[i] = format;
}
qMeta.put(formatsArray);
} catch (InterruptedException e)
{
e.printStackTrace();
}
} else if (localName.equals("Data"))
{
byte[] data = StringUtils.hexStringToByteArray(currentDataChars
.toString());
currentBuffer.setData(data);
currentBuffer.setOffset(0);
currentBuffer.setLength(data.length);
try
{
qBuffers.get(currentTrack).put(currentBuffer);
} catch (InterruptedException e)
{
throw new SAXException(e); // TODO: there should be an
// InterruptedSAXException...
}
currentBuffer = null;
currentTrack = -1;
currentDataChars = null;
state = AWAIT_BUFFER;
}
}
public void postError(Exception e) throws InterruptedException
{
if (qMeta != null)
qMeta.put(e);
if (qBuffers != null)
{
for (ProducerConsumerQueue q : qBuffers.values())
{
if (q != null)
q.put(e);
}
}
}
public Buffer readBuffer(int track) throws SAXException, IOException,
InterruptedException
{
final Object o = qBuffers.get(track).get();
if (o instanceof Buffer)
return (Buffer) o;
else if (o instanceof SAXException)
throw (SAXException) o;
else if (o instanceof IOException)
throw (IOException) o;
else
throw new RuntimeException("Unknown object in queue: " + o);
}
public Format[] readTracksInfo() throws SAXException, IOException,
InterruptedException
{
final Object o = qMeta.get();
if (o instanceof Format[])
return (Format[]) o;
else if (o instanceof SAXException)
throw (SAXException) o;
else if (o instanceof IOException)
throw (IOException) o;
else
throw new RuntimeException("Unknown object in queue: " + o);
}
@Override
public void startElement(String namespaceURI, String localName,
String qName, Attributes atts) throws SAXException
{
// TODO: verify element nesting
try
{
if (localName.equals("XmlMovie"))
{
final String version = atts.getValue(atts.getIndex("version"));
if (!version.equals("1.0"))
throw new SAXException("Expection XmlMovie version 1.0");
} else if (localName.equals("Track"))
{
// TODO: catch exceptions
final int index = getIntAttr(atts, "index");
final String formatStr = getStringAttr(atts, "format");
Format format = FormatArgUtils.parse(formatStr);
formatsMap.put(index, format);
qBuffers.put(index, new ProducerConsumerQueue());
}
else if (localName.equals("Buffer"))
{
currentTrack = getIntAttr(atts, "track");
final long sequenceNumber = getLongAttr(atts, "sequenceNumber",
Buffer.SEQUENCE_UNKNOWN);
final long timeStamp = getLongAttr(atts, "timeStamp");
final long duration = getLongAttr(atts, "duration", -1L);
final int flags = getIntAttr(atts, "flags", 0);
final String formatStr = getStringAttr(atts, "format", null);
final Format format = formatStr == null ? formatsMap
.get(currentTrack) : FormatArgUtils.parse(formatStr);
Buffer buffer = new Buffer();
buffer.setSequenceNumber(sequenceNumber);
buffer.setTimeStamp(timeStamp);
buffer.setDuration(duration);
buffer.setFlags(flags);
buffer.setFormat(format);
currentBuffer = buffer; // data will be set when we get the data
// element
currentDataChars = new StringBuilder();
state = AWAIT_DATA;
//
// b.append("");
// b.append(StringUtils.byteArrayToHexString((byte[])
// buffer.getData(), buffer.getLength(), buffer.getOffset()));
// b.append("");
// b.append("\n");
} else if (localName.equals("Data"))
{
if (state != AWAIT_DATA)
throw new SAXException("Not expecting Data element");
state = READ_DATA;
}
// if (namespaceURI.equals("http://recipes.org") &&
// localName.equals("ingredient")) {
// String n = atts.getValue("","name");
// if (n.equals("flour")) {
// String a = atts.getValue("","amount"); // assume 'amount'
// exists
// amount = amount + Float.valueOf(a).floatValue();
// }
// }
} catch (SAXException e)
{
throw e;
} catch (Exception e)
{
throw new SAXException(e);
}
}
}
/**
* Thread to parse FMJ's XML movie format, results handled by
* XmlMovieSAXHandler. XmlMovieSAXHandler can be used to read parsed results.
*
* @author Ken Larson
*
*/
class XmlMovieSAXParserThread extends CloseableThread
{
private final XmlMovieSAXHandler handler;
private final InputStream is;
public XmlMovieSAXParserThread(XmlMovieSAXHandler handler, InputStream is)
{
super();
this.handler = handler;
this.is = is;
}
@Override
public void run()
{
try
{
try
{
final XMLReader parser = XMLReaderFactory.createXMLReader();
parser.setContentHandler(handler);
parser.parse(new InputSource(is));
} catch (SAXException e)
{
handler.postError(e);
} catch (IOException e)
{
handler.postError(e);
}
} catch (InterruptedException e)
{ // exit thread
} finally
{
setClosed();
}
}
}