org.apache.tika.parser.audio.MidiParser Maven / Gradle / Ivy
/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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 org.apache.tika.parser.audio;
import static java.nio.charset.StandardCharsets.ISO_8859_1;
import javax.sound.midi.InvalidMidiDataException;
import javax.sound.midi.MetaMessage;
import javax.sound.midi.MidiMessage;
import javax.sound.midi.MidiSystem;
import javax.sound.midi.Patch;
import javax.sound.midi.Sequence;
import javax.sound.midi.Track;
import java.io.BufferedInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.Arrays;
import java.util.Collections;
import java.util.HashSet;
import java.util.Set;
import org.apache.tika.exception.TikaException;
import org.apache.tika.metadata.Metadata;
import org.apache.tika.mime.MediaType;
import org.apache.tika.parser.AbstractParser;
import org.apache.tika.parser.ParseContext;
import org.apache.tika.sax.XHTMLContentHandler;
import org.xml.sax.ContentHandler;
import org.xml.sax.SAXException;
public class MidiParser extends AbstractParser {
/** Serial version UID */
private static final long serialVersionUID = 6343278584336189432L;
private static final Set SUPPORTED_TYPES =
Collections.unmodifiableSet(new HashSet(Arrays.asList(
MediaType.application("x-midi"),
MediaType.audio("midi"))));
public Set getSupportedTypes(ParseContext context) {
return SUPPORTED_TYPES;
}
public void parse(
InputStream stream, ContentHandler handler,
Metadata metadata, ParseContext context)
throws IOException, SAXException, TikaException {
metadata.set(Metadata.CONTENT_TYPE, "audio/midi");
XHTMLContentHandler xhtml = new XHTMLContentHandler(handler, metadata);
xhtml.startDocument();
// MidiSystem expects the stream to support the mark feature
if (! stream.markSupported()) {
stream = new BufferedInputStream(stream);
}
try {
Sequence sequence = MidiSystem.getSequence(stream);
Track[] tracks = sequence.getTracks();
metadata.set("tracks", String.valueOf(tracks.length));
// TODO: Use XMPDM.TRACKS?
Patch[] patches = sequence.getPatchList();
metadata.set("patches", String.valueOf(patches.length));
float type = sequence.getDivisionType();
if (type == Sequence.PPQ) {
metadata.set("divisionType", "PPQ");
} else if (type == Sequence.SMPTE_24) {
metadata.set("divisionType", "SMPTE_24");
} else if (type == Sequence.SMPTE_25) {
metadata.set("divisionType", "SMPTE_25");
} else if (type == Sequence.SMPTE_30) {
metadata.set("divisionType", "SMPTE_30");
} else if (type == Sequence.SMPTE_30DROP) {
metadata.set("divisionType", "SMPTE_30DROP");
} else if (type == Sequence.SMPTE_24) {
metadata.set("divisionType", String.valueOf(type));
}
for (Track track : tracks) {
xhtml.startElement("p");
for (int i = 0; i < track.size(); i++) {
MidiMessage message = track.get(i).getMessage();
if (message instanceof MetaMessage) {
MetaMessage meta = (MetaMessage) message;
// Types 1-15 are reserved for text events
if (meta.getType() >= 1 && meta.getType() <= 15) {
// FIXME: What's the encoding?
xhtml.characters(
new String(meta.getData(), ISO_8859_1));
}
}
}
xhtml.endElement("p");
}
} catch (InvalidMidiDataException ignore) {
// There is no way to know whether this exception was
// caused by the document being corrupted or by the format
// just being unsupported. So we do nothing.
}
xhtml.endDocument();
}
}