Working with PDF RichMedia Annotations

29 0 obj      % Assets name tree
<< /Names [ (video.mp4) 30 0 R (Flash.swf) 31 0 R ] >>
endobj
 
30 0 obj      % File specification dictionary for video file
<< /Type /Filespec
 /F (video.mp4)
 /UF (video.mp4)
 /EF >> % Stream containing the video file
>>
endobj
 
31 0 obj      % File specification dictionary for SWF file
<< /Type /Filespec
 /F (Flash.swf)
 /UF (Flash.swf)
 /EF << /F 41 0 R >>  % Stream containing the Flash file
>>
endobj
 
40 0 obj      % Embedded file stream for video file
<< /Type /EmbeddedFile  % video.mp4  /Length ...  /Filter ... >>
stream
- DATA for video.mp4 -
endstream
endobj

Annot mRichMediaAnnot;
 
public File getRichMediaFile() {
  File mediaFile = null;
 
  try {
    Page page = mPDFView.getDoc().getPage(mPDFView.getCurrentPage());
    int numAnnots = page.getNumAnnots();
    for (int i = 0; i < numAnnots; ++i) {
    mRichMediaAnnot = page.getAnnot(i);
    if (!mRichMediaAnnot.isValid()) {
      continue;
    }
    // Check if the current annotation is a RichMedia type
    if (mRichMediaAnnot.getType() == Annot.e_RichMedia) {
      Obj annotObj = mRichMediaAnnot.getSDFObj();
      Obj rmcObj = annotObj.findObj("RichMediaContent");
      if (rmcObj != null) {
        NameTree assets = new NameTree(rmcObj.findObj("Assets"));
        if (assets.isValid()) {
        NameTreeIterator j = assets.getIterator();
        for (; j.hasNext(); j.next()) {
 
          // We iterate through the assets tree and get the name
          // of the files
          String asset_name = j.key().getAsPDFText();
 
          // At this point we can perform a pre-check if the file
          // is supported by looking at its extension, and jump
          // to the next one if it is not the case
          if (isMediaFileSupported(asset_name)) {
            mediaFile = new File(getApplicationContext().getExternalFilesDir(null), asset_name);
            FileSpec file_spec = new FileSpec(j.value());
            Filter stm = file_spec.getFileData();
            if (stm != null) {
            stm.writeToFile(mediaFile.getAbsolutePath(), false);
            break;
            }
          }
        }
        }
      }
      break;
    }
    }
 
  } catch (PDFNetException e) {
    e.printStackTrace();
  }
 
  return mediaFile;
}
 
// Check if the video file is supported on the current platform.
public boolean isMediaFileSupported(String fileName) {
  String[] SUPPORTED_FORMATS = {".3gp", ".mp4", ".ts", ".webm", ".mkv"};
  int idx = fileName.lastIndexOf(".");
  return ((idx != -1) && Arrays.asList(SUPPORTED_FORMATS).contains(fileName.substring(idx)));
}

VideoView mVideoView;
 
private void setupAndPlayMedia(File mediaFile, Annot richMediaAnnot) {
    mVideoView = new VideoView(mPDFView.getContext());
 
    mVideoView.setOnPreparedListener(new MediaPlayer.OnPreparedListener() {
        @Override
        public void onPrepared(MediaPlayer mp) {
            new StartVideoViewTask().execute();
        }
    });
 
    mVideoView.setOnCompletionListener(new MediaPlayer.OnCompletionListener() {
        @Override
        public void onCompletion(MediaPlayer mp) {
            Toast.makeText(mPDFView.getContext(), "End of video playback", Toast.LENGTH_SHORT).show();
        }
    });
 
    // Adjust size and position of the VideoView widget
    adjustViewPosition(mVideoView, richMediaAnnot);
 
    mVideoView.setVideoPath(mediaFile.getAbsolutePath());
    mVideoView.setMediaController(new MediaController(mPDFView.getContext()));
 
    // Add the view to PDFViewCtrl
    mPDFView.addView(mVideoView);
}
 
// This method gets the size/position information of the RichMedia annotation
// and sets the layout of the view with the same size.
private void adjustViewPosition(View view, Annot annot) {
    if (view != null && annot != null) {
        try {
            pdftron.PDF.Rect r = annot.getRect();;
            double x1 = r.getX1();
            double y1 = r.getY2();
            double x2 = r.getX2();
            double y2 = r.getY1();
            // The annotation size is expressed on page space, so we first need to
            // convert the positions to screen space to set the view layout.
            double pts1[] = mPDFView.convPagePtToScreenPt(x1, y1, mPDFView.getCurrentPage());
            double pts2[] = mPDFView.convPagePtToScreenPt(x2, y2, mPDFView.getCurrentPage());
            x1 = pts1[0];
            y1 = pts1[1];
            x2 = pts2[0];
            y2 = pts2[1];
 
            int sx = mPDFView.getScrollX();
            int sy = mPDFView.getScrollY();
            int anchor_x = (int) (x1 + sx + 0.5);
            int anchor_y = (int) (y1 + sy + 0.5);
            view.layout(anchor_x, anchor_y, (int) (anchor_x + x2 - x1 + 0.5), (int) (anchor_y + y2 - y1 + 0.5));
 
        } catch (PDFNetException e) {
 
        }
    }
}
 
// This async task is used to start the video playback
private class StartVideoViewTask extends AsyncTask<Void, Void, Void> {
    @Override
    protected void onProgressUpdate(Void... values) {
        if (mVideoView != null) {
            mVideoView.start();
        }
    }
}

// Start playback
File mediaFile = getRichMediaFile();
if (mediaFile != null) {
  setupAndPlayMedia(mediaFile, mRichMediaAnnot);
}
 
// Stop playback
if (mVideoView != null) {
  mVideoView.stopPlayback();
  mPDFView.removeView(mVideoView);
  mVideoView = null;
}

PDFDoc doc = new PDFDoc();
Page page = doc.pageCreate();
 
// Create a new RichMedia annotation and populate it with the
// required information
Annot annot = Annot.create(doc, Annot.e_RichMedia,
  new Rect(50, 50, 200, 200));
Obj annotObj = annot.getSDFObj();
Obj rmcObj = annotObj.putDict("RichMediaContent");
 
// Embed the video file
String video_file = "video.mp4";
FileSpec fs = FileSpec.create(doc, "D:/" + video_file);
fs.getSDFObj().putString("F", video_file);
fs.getSDFObj().putText("UF", video_file);
 
// Create/find the asset NameTree
NameTree assets = NameTree.create(doc, "Assets");
assets.put(video_file.getBytes(), fs.getSDFObj());
 
rmcObj.put("Assets", assets.getSDFObj());
 
Obj config = doc.createIndirectDict();
config.putName("SubType", "Video");
 
Obj instance = doc.createIndirectDict();
instance.put("Asset", fs.getSDFObj());
 
Obj instances = doc.createIndirectArray();
instances.pushBack(instance);
config.put("Instances", instances);
 
Obj configs = doc.createIndirectArray();
configs.pushBack(config);
 
rmcObj.put("Configurations", configs);
 
// Let's create an appearance for the annotation
// using an image
ElementBuilder builder = new ElementBuilder();
ElementWriter writer = new ElementWriter();
writer.begin(doc);
Image image = Image.create(doc, "D:/image.jpg");
Element element = builder.createImage(image,
  Matrix2D.identityMatrix());
Rect bbox = element.getBBox();
writer.writeElement(element);
Obj appearance = writer.end();
appearance.putRect("BBox", bbox.getX1(),
  bbox.getY1(), bbox.getX2(), bbox.getY2());
appearance.putName("Subtype", "Form");
annot.setAppearance(appearance);
 
// Add the annotation to the document
page.annotPushBack(annot);
doc.pagePushBack(page);
doc.save("document.pdf", SDFDoc.e_linearized, null);
doc.close();