Problems capturing pictures about OS6 - East System.getProperty ("video.snapshot.encodings"); valid?
Hello
I hope someone can help with this query.
I use the code that is very similar to the sample application camerademo to take a photo using the camera. It works properly on devices running OS5. However, on devices running OS6 photo is just an image of white/black.
I think I followed the problem until the encoding string passed to getSnapshot(). When I switch which must be a valid encoding string (based on the output of System.getProperty ("video.snapshot.encodings")) the captured image is a black screen. However, when I pass null to getSnapshot() it works correctly. I want to avoid using null as the captured image is much more that I need and for reasons of effectiveness, I would like to avoid having to reduce its size after the capture of the photo.
I tested this on the 9780 Simulator. The corresponding code is included below for reference.
Thanks in advance!
/*
* CameraDemo.java
*
* Copyright © 1998-2008 Research In Motion Ltd.
*
* Note: For the sake of simplicity, this sample application may not leverage
* resource bundles and resource strings. However, it is STRONGLY recommended
* that application developers make use of the localization features available
* within the BlackBerry development platform to ensure a seamless application
* experience across a variety of languages and geographies. For more information
* on localizing your application, please refer to the BlackBerry Java Development
* Environment Development Guide associated with this release.
*/
package com.rim.samples.device.camerademo;
import java.util.Vector;
import javax.microedition.amms.control.camera.CameraControl;
import javax.microedition.media.Manager;
import javax.microedition.media.Player;
import javax.microedition.media.control.VideoControl;
import net.rim.device.api.system.Characters;
import net.rim.device.api.ui.Field;
import net.rim.device.api.ui.Keypad;
import net.rim.device.api.ui.UiApplication;
import net.rim.device.api.ui.component.Dialog;
import net.rim.device.api.ui.component.RichTextField;
import net.rim.device.api.ui.container.MainScreen;
import net.rim.device.api.util.StringUtilities;
/**
* A sample application used to demonstrate the VideoControl.getSnapshot()
* method. Creates a custom camera which can take snapshots from the
* Blackberry's camera.
*/
final class CameraDemo extends UiApplication
{
/** Entry point for this application. */
public static void main(String[] args)
{
CameraDemo demo = new CameraDemo();
demo.enterEventDispatcher();
}
/** Constructor. */
private CameraDemo()
{
CameraScreen screen = new CameraScreen();
pushScreen( screen );
}
}
/**
* A UI screen to display the camera display and buttons.
*/
final class CameraScreen extends MainScreen
{
/** The camera's video controller. */
private VideoControl _videoControl;
/** The field containing the feed from the camera. */
private Field _videoField;
private Player player;
/** An array of valid snapshot encodings. */
private EncodingProperties[] _encodings;
/**
* Constructor. Initializes the camera and creates the UI.
*/
public CameraScreen()
{
//Set the title of the screen.
//setTitle( new LabelField( "Camera Demo" , LabelField.ELLIPSIS | LabelField.USE_ALL_WIDTH ) );
//Initialize the camera object and video field.
initializeCamera();
//Initialize the list of possible encodings.
initializeEncodingList();
//If the field was constructed successfully, create the UI.
if(_videoField != null)
{
createUI();
}
//If not, display an error message to the user.
else
{
add( new RichTextField( "Error connecting to camera." ) );
}
}
/**
* Adds the VideoField and the "Take Photo" button to the screen.
*/
private void createUI()
{
//Add the video field to the screen.
add(_videoField);
}
/**
* Initializes the Player, VideoControl and VideoField.
*/
private void initializeCamera()
{
try
{
//Create a player for the Blackberry's camera.
player = Manager.createPlayer( "capture://video" );
//Set the player to the REALIZED state (see Player docs.)
player.realize();
//Grab the video control and set it to the current display.
_videoControl = (VideoControl)player.getControl( "VideoControl" );
if (_videoControl != null)
{
//Create the video field as a GUI primitive (as opposed to a
//direct video, which can only be used on platforms with
//LCDUI support.)
_videoField = (Field) _videoControl.initDisplayMode (VideoControl.USE_GUI_PRIMITIVE, "net.rim.device.api.ui.Field");
//Display the video control
_videoControl.setDisplayFullScreen(true);
_videoControl.setVisible(true);
}
//Set the player to the STARTED state (see Player docs.)
player.start();
}
catch(Exception e)
{
Dialog.alert( "ERROR " + e.getClass() + ": " + e.getMessage() );
}
}
/**
* Create a screen used to display a snapshot.
* @param raw A byte array representing an image.
*/
private void createImageScreen( byte[] raw )
{
//Initialize the screen.
ImageScreen imageScreen = new ImageScreen( raw );
//Push this screen to display it to the user.
UiApplication.getUiApplication().pushScreen( imageScreen );
}
/**
* Handle trackball click events.
* @see net.rim.device.api.ui.Screen#invokeAction(int)
*/
protected boolean invokeAction(int action)
{
boolean handled = super.invokeAction(action);
if(!handled)
{
switch(action)
{
case ACTION_INVOKE: // Trackball click.
{
try
{
//A null encoding indicates that the camera should
//use the default snapshot encoding.
String encoding = null;
// All the below result in a black screen being captured on OS6 devices
// encoding = "encoding=jpeg&width=1024&height=768";
// encoding = "encoding=jpeg&width=1024&height=768&quality=superfine";
// encoding = _encodings[1].getFullEncoding();
// Null works but the image captured is large (~1MB)
encoding = null;
//Retrieve the raw image from the VideoControl and
//create a screen to display the image to the user.
createImageScreen(_videoControl.getSnapshot( encoding ) );//null works
}
catch(final Throwable e)
{
UiApplication.getUiApplication().invokeLater(new Runnable()
{
public void run()
{
Dialog.alert( "ERROR " + e.getClass() + ": " + e.getMessage() );
}
});
}
return true;
}
}
}
return handled;
}
/**
* Prevent the save dialog from being displayed.
* @see net.rim.device.api.ui.container.MainScreen#onSavePrompt()
*/
public boolean onSavePrompt()
{
return true;
}
/**
* Initialize the list of encodings.
*/
private void initializeEncodingList()
{
try
{
//Retrieve the list of valid encodings.
String encodingString = System.getProperty("video.snapshot.encodings");
//Extract the properties as an array of words.
String[] properties = StringUtilities.stringToKeywords(encodingString);
//The list of encodings;
Vector encodingList = new Vector();
//Strings representing the four properties of an encoding as
//returned by System.getProperty().
String encoding = "encoding";
String width = "width";
String height = "height";
EncodingProperties temp = null;
for(int i = 0; i < properties.length ; ++i)
{
if( properties[i].equals(encoding))
{
if(temp != null && temp.isComplete())
{
//Add a new encoding to the list if it has been
//properly set.
encodingList.addElement( temp );
}
temp = new EncodingProperties();
//Set the new encoding's format.
++i;
temp.setFormat(properties[i]);
}
else if( properties[i].equals(width))
{
//Set the new encoding's width.
++i;
temp.setWidth(properties[i]);
}
else if( properties[i].equals(height))
{
//Set the new encoding's height.
++i;
temp.setHeight(properties[i]);
}
}
//If there is a leftover complete encoding, add it.
if(temp != null && temp.isComplete())
{
encodingList.addElement( temp );
}
//Convert the Vector to an array for later use.
_encodings = new EncodingProperties[ encodingList.size() ];
encodingList.copyInto((Object[])_encodings);
}
catch (Exception e)
{
//Something is wrong, indicate that there are no encoding options.
_encodings = null;
}
}
protected boolean keyDown(int keycode,
int time) {
System.out.println("Input" + keycode + "/" + Keypad.key(keycode) + " C1 = " + Keypad.KEY_CONVENIENCE_1 + " C2 = " + Keypad.KEY_CONVENIENCE_2);
if ( Keypad.key(keycode) == Keypad.KEY_CONVENIENCE_1 ) {
return true;
}
return super.keyDown(keycode, time);
}
protected boolean keyChar(char c, int status, int time) {
System.out.println("Input" + c + ":" + Keypad.getKeyCode(c, status));
switch (c) {
case Characters.ESCAPE:
this.close();
return true;
default:
return super.keyChar(c, status, time);
}
}
}
Thanks for getting back to me.
It turns out that it was only a problem on the Simulator. I managed to get my hands on a real device 9780 and the code works fine on it.
Tags: BlackBerry Developers
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