com.googlecode.mp4parser.authoring.tracks.ttml.TtmlTrackImpl Maven / Gradle / Ivy
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A generic parser and writer for all ISO 14496 based files (MP4, Quicktime, DCF, PDCF, ...)
package com.googlecode.mp4parser.authoring.tracks.ttml;
import com.coremedia.iso.boxes.SampleDescriptionBox;
import com.coremedia.iso.boxes.SubSampleInformationBox;
import com.googlecode.mp4parser.authoring.AbstractTrack;
import com.googlecode.mp4parser.authoring.Sample;
import com.googlecode.mp4parser.authoring.TrackMetaData;
import com.mp4parser.iso14496.part30.XMLSubtitleSampleEntry;
import org.w3c.dom.Document;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
import org.xml.sax.SAXException;
import javax.xml.parsers.ParserConfigurationException;
import javax.xml.xpath.*;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.URI;
import java.net.URISyntaxException;
import java.nio.ByteBuffer;
import java.nio.channels.WritableByteChannel;
import java.util.*;
import static com.googlecode.mp4parser.authoring.tracks.ttml.TtmlHelpers.*;
public class TtmlTrackImpl extends AbstractTrack {
TrackMetaData trackMetaData = new TrackMetaData();
SampleDescriptionBox sampleDescriptionBox = new SampleDescriptionBox();
XMLSubtitleSampleEntry xmlSubtitleSampleEntry = new XMLSubtitleSampleEntry();
List samples = new ArrayList();
SubSampleInformationBox subSampleInformationBox = new SubSampleInformationBox();
private long[] sampleDurations;
public TtmlTrackImpl(String name, List ttmls) throws IOException, ParserConfigurationException, SAXException, XPathExpressionException, URISyntaxException {
super(name);
extractLanguage(ttmls);
Set mimeTypes = new HashSet();
sampleDurations = new long[ttmls.size()];
XPathFactory xPathfactory = XPathFactory.newInstance();
XPath xpath = xPathfactory.newXPath();
xpath.setNamespaceContext(TtmlHelpers.NAMESPACE_CONTEXT);
long startTime = 0;
for (int sampleNo = 0; sampleNo < ttmls.size(); sampleNo++) {
final Document ttml = ttmls.get(sampleNo);
SubSampleInformationBox.SubSampleEntry subSampleEntry = new SubSampleInformationBox.SubSampleEntry();
subSampleInformationBox.getEntries().add(subSampleEntry);
subSampleEntry.setSampleDelta(1);
sampleDurations[sampleNo] = extractDuration(ttml);
List images = extractImages(ttml);
mimeTypes.addAll(extractMimeTypes(ttml));
// No changes of XML after this point!
final ByteArrayOutputStream baos = new ByteArrayOutputStream();
TtmlHelpers.pretty(ttml, baos, 4);
SubSampleInformationBox.SubSampleEntry.SubsampleEntry xmlEntry =
new SubSampleInformationBox.SubSampleEntry.SubsampleEntry();
xmlEntry.setSubsampleSize(baos.size());
subSampleEntry.getSubsampleEntries().add(xmlEntry);
for (byte[] image : images) {
baos.write(image);
SubSampleInformationBox.SubSampleEntry.SubsampleEntry imageEntry =
new SubSampleInformationBox.SubSampleEntry.SubsampleEntry();
imageEntry.setSubsampleSize(image.length);
subSampleEntry.getSubsampleEntries().add(imageEntry);
}
final byte[] finalSample = baos.toByteArray();
samples.add(new Sample() {
public void writeTo(WritableByteChannel channel) throws IOException {
channel.write(ByteBuffer.wrap(finalSample));
}
public long getSize() {
return finalSample.length;
}
public ByteBuffer asByteBuffer() {
return ByteBuffer.wrap(finalSample);
}
});
}
xmlSubtitleSampleEntry.setNamespace(join(",", getAllNamespaces(ttmls.get(0))));
xmlSubtitleSampleEntry.setSchemaLocation("");
xmlSubtitleSampleEntry.setAuxiliaryMimeTypes(join(",", new ArrayList(mimeTypes).toArray(new String[mimeTypes.size()])));
sampleDescriptionBox.addBox(xmlSubtitleSampleEntry);
trackMetaData.setTimescale(30000);
trackMetaData.setLayer(65535);
}
public static String getLanguage(Document document) {
return document.getDocumentElement().getAttribute("xml:lang");
}
protected static List extractImages(Document ttml) throws XPathExpressionException, URISyntaxException, IOException {
XPathFactory xPathfactory = XPathFactory.newInstance();
XPath xpath = xPathfactory.newXPath();
XPathExpression expr = xpath.compile("//*/@backgroundImage");
NodeList nl = (NodeList) expr.evaluate(ttml, XPathConstants.NODESET);
LinkedHashMap internalNames2Original = new LinkedHashMap();
int p = 1;
for (int i = 0; i < nl.getLength(); i++) {
Node bgImageNode = nl.item(i);
String uri = bgImageNode.getNodeValue();
String ext = uri.substring(uri.lastIndexOf("."));
String internalName = internalNames2Original.get(uri);
if (internalName == null) {
internalName = "urn:mp4parser:" + p++ + ext;
internalNames2Original.put(internalName, uri);
}
bgImageNode.setNodeValue(internalName);
}
List images = new ArrayList();
if (!internalNames2Original.isEmpty()) {
for (Map.Entry internalName2Original : internalNames2Original.entrySet()) {
URI pic = new URI(ttml.getDocumentURI()).resolve(internalName2Original.getValue());
images.add(streamToByteArray(pic.toURL().openStream()));
}
}
return images;
}
private static String join(String joiner, String[] i) {
StringBuilder result = new StringBuilder();
for (String s : i) {
result.append(s).append(joiner);
}
result.setLength(result.length() > 0 ? result.length() - 1 : 0);
return result.toString();
}
private static long latestTimestamp(Document document) {
XPathFactory xPathfactory = XPathFactory.newInstance();
XPath xpath = xPathfactory.newXPath();
xpath.setNamespaceContext(TtmlHelpers.NAMESPACE_CONTEXT);
try {
XPathExpression xp = xpath.compile("//*[name()='p']");
NodeList timedNodes = (NodeList) xp.evaluate(document, XPathConstants.NODESET);
long lastTimeStamp = 0;
for (int i = 0; i < timedNodes.getLength(); i++) {
lastTimeStamp = Math.max(getEndTime(timedNodes.item(i)), lastTimeStamp);
}
return lastTimeStamp;
} catch (XPathExpressionException e) {
throw new RuntimeException(e);
}
}
private static byte[] streamToByteArray(InputStream input) throws IOException {
byte[] buffer = new byte[8096];
ByteArrayOutputStream output = new ByteArrayOutputStream();
int n = 0;
while (-1 != (n = input.read(buffer))) {
output.write(buffer, 0, n);
}
return output.toByteArray();
}
protected long firstTimestamp(Document document) {
XPathFactory xPathfactory = XPathFactory.newInstance();
XPath xpath = xPathfactory.newXPath();
xpath.setNamespaceContext(TtmlHelpers.NAMESPACE_CONTEXT);
try {
XPathExpression xp = xpath.compile("//*[@begin]");
NodeList timedNodes = (NodeList) xp.evaluate(document, XPathConstants.NODESET);
long firstTimestamp = Long.MAX_VALUE;
for (int i = 0; i < timedNodes.getLength(); i++) {
firstTimestamp = Math.min(getStartTime(timedNodes.item(i)), firstTimestamp);
}
return firstTimestamp;
} catch (XPathExpressionException e) {
throw new RuntimeException(e);
}
}
protected long lastTimestamp(Document document) {
XPathFactory xPathfactory = XPathFactory.newInstance();
XPath xpath = xPathfactory.newXPath();
xpath.setNamespaceContext(TtmlHelpers.NAMESPACE_CONTEXT);
try {
XPathExpression xp = xpath.compile("//*[@end]");
NodeList timedNodes = (NodeList) xp.evaluate(document, XPathConstants.NODESET);
long lastTimeStamp = 0;
for (int i = 0; i < timedNodes.getLength(); i++) {
lastTimeStamp = Math.max(getEndTime(timedNodes.item(i)), lastTimeStamp);
}
return lastTimeStamp;
} catch (XPathExpressionException e) {
throw new RuntimeException(e);
}
}
protected void extractLanguage(List ttmls) {
String firstLang = null;
for (Document ttml : ttmls) {
String lang = getLanguage(ttml);
if (firstLang == null) {
firstLang = lang;
trackMetaData.setLanguage(Locale.forLanguageTag(lang).getISO3Language());
} else if (!firstLang.equals(lang)) {
throw new RuntimeException("Within one Track all sample documents need to have the same language");
}
}
}
protected List extractMimeTypes(Document ttml) throws XPathExpressionException {
XPathFactory xPathfactory = XPathFactory.newInstance();
XPath xpath = xPathfactory.newXPath();
XPathExpression expr = xpath.compile("//*/@smpte:backgroundImage");
NodeList nl = (NodeList) expr.evaluate(ttml, XPathConstants.NODESET);
Set mimeTypes = new LinkedHashSet();
int p = 1;
for (int i = 0; i < nl.getLength(); i++) {
Node bgImageNode = nl.item(i);
String uri = bgImageNode.getNodeValue();
String ext = uri.substring(uri.lastIndexOf("."));
if (ext.contains("jpg") || ext.contains("jpeg")) {
mimeTypes.add("image/jpeg");
} else if (ext.contains("png")) {
mimeTypes.add("image/png");
}
}
return new ArrayList(mimeTypes);
}
long extractDuration(Document ttml) {
return lastTimestamp(ttml) - firstTimestamp(ttml);
}
public SampleDescriptionBox getSampleDescriptionBox() {
return sampleDescriptionBox;
}
public long[] getSampleDurations() {
long[] adoptedSampleDuration = new long[sampleDurations.length];
for (int i = 0; i < adoptedSampleDuration.length; i++) {
adoptedSampleDuration[i] = sampleDurations[i] * trackMetaData.getTimescale() / 1000;
}
return adoptedSampleDuration;
}
public TrackMetaData getTrackMetaData() {
return trackMetaData;
}
public String getHandler() {
return "subt";
}
public List getSamples() {
return samples;
}
@Override
public SubSampleInformationBox getSubsampleInformationBox() {
return subSampleInformationBox;
}
public void close() throws IOException {
}
}