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CHAPTER 2: Media Capture
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We initialize the media objects when first constructing the screen. As a result, the media operations are executed on the main thread and not a separate thread. Some Player methods, such as starting and stopping, are asynchronous, so you can safely call them from any thread without delay. Other operations, like the realize() and prefetch() that implicitly occur when you first call start(), block until they complete. This may seem dangerous to astute readers, as blocking operations should be called from a separate thread. Fortunately, BlackBerry devices do not delay long when starting capture, so you can safely fudge the rules here. This is handy, because you need to start your VideoControl before you can obtain the Field, and you must add your Field to the screen from the main UI thread. In other words, doing these tasks synchronously greatly simplifies the code. You ll see examples of handling media on separate threads in 3.
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public void initMedia() { try { switch (type) { case RECORD_AUDIO: player = Manager.createPlayer("capture://audio"); player.start(); break; case RECORD_PICTURE: case RECORD_VIDEO: player = Manager.createPlayer("capture://video"); player.start(); video = (VideoControl)player.getControl("VideoControl"); cameraView = (Field)video.initDisplayMode( VideoControl.USE_GUI_PRIMITIVE, "net.rim.device.api.ui.Field"); add(cameraView); break; } player.addPlayerListener(this); state = STATE_READY; status.setText("Ready"); } catch (MediaException me) { status.setText(me.getMessage()); } catch (IOException ioe) { status.setText(ioe.getMessage()); } }
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We add the appropriate MenuItem objects to the menu based on the current state of the application. For example, Go will only display if we are in the READY state.
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public void makeMenu(Menu menu, int instance) { if (instance == Menu.INSTANCE_DEFAULT)
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CHAPTER 2: Media Capture
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{ if (state == STATE_READY) { menu.add(goItem); } else if (state == STATE_RECORDING) { menu.add(stopItem); } menu.add(doneItem); } super.makeMenu(menu, instance); }
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Our actual media operations are quite simple, requiring just a couple method calls. Because image capture is so different from audio/video capture, it uses a separate helper method.
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private void go() { if (type == RECORD_PICTURE) { takeSnapShot(); } else { recorder = (RecordControl)player.getControl("RecordControl"); if (recorder != null) { recorder.setRecordStream(dataOut); recorder.startRecord(); state = STATE_RECORDING; status.setText("Recording"); } } } private void takeSnapShot() { try { byte[] imageData = video.getSnapshot ("encoding=jpeg&width=640&height=480&quality=normal"); if (imageData != null) { writeToFile(imageData, location + "/image.jpg"); status.setText("Image taken"); } else { status.setText("Please try again later."); } } catch (IOException ioe)
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CHAPTER 2: Media Capture
{ status.setText(ioe.getMessage()); } catch (MediaException me) { status.setText(me.getMessage()); } }
This helper method moves data from an in-memory buffer to a persistent store. You ll notice that the FileConnection is opened with READ_WRITE access, even though only WRITE is required. This is because of a bug in older versions of BlackBerry device software that caused writes to fail unless READ_WRITE was requested. Newer software versions do not have this problem, but it doesn t hurt to ask for the extra access. Also, note that the file OutputStream is closed before the FileConnection. Certain versions of BlackBerry device software do not respond well if the FileConnection is closed first, which can leave you unable to reopen the file later.
private void writeToFile(byte[] data, String fileName) throws IOException { FileConnection file = null; OutputStream output = null; try { file = (FileConnection)Connector.open(fileName, Connector.READ_WRITE); if (file.exists()) { file.delete(); } file.create(); output = file.openOutputStream(); output.write(data); } finally { if (output != null) { output.close(); } if (file != null) { file.close(); } } } private void stop() { try { if (type == RECORD_AUDIO || type == RECORD_VIDEO) { recorder.commit(); if (type == RECORD_AUDIO) { writeToFile(dataOut.toByteArray(), location + "/audio.amr"); } else
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CHAPTER 2: Media Capture
{ writeToFile(dataOut.toByteArray(), location + "/video.3gp"); } status.setText("Data saved"); state = STATE_READY; } } catch (IOException ioe) { status.setText(ioe.getMessage()); } } public void playerUpdate(Player arg0, String arg1, Object arg2) { System.out.println("playerUpdate: " + arg1); }
Listing 2-4 presents the RecordingChoiceScreen. This is the first visual element that will display, and offers minimal text as well as menu options for supported forms of media capture.
Listing 2-4. Examining Device Capabilities and Presenting Options package com.apress.king.mediagrabber; import net.rim.device.api.ui.*; import net.rim.device.api.ui.component.*; import net.rim.device.api.ui.container.MainScreen; public class RecordingChoicesScreen extends MainScreen { private BasicEditField location = new BasicEditField ("Save location:", "file:///SDCard/BlackBerry", 100, Field.FIELD_VCENTER | BasicEditField.FILTER_FILENAME); private MenuItem audioItem = new MenuItem("Record Sound", 0, 0) { public void run() { launchRecorder(RecordingScreen.RECORD_AUDIO); } }; private MenuItem pictureItem = new MenuItem("Take a Picture", 0, 0) { public void run() { launchRecorder(RecordingScreen.RECORD_PICTURE); } }; private MenuItem videoItem = new MenuItem("Record Video", 0, 0) { public void run()
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