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The attribute stream is always required and must be specified for each measurement

A stream is measured as long as the application is in the foreground. When the application goes into the background, the current status is transmitted to the measurement system and the measurement stops. If the stream should be measured again, when the application will come back to the foreground, the method track must be called again.

// start streaming measurement
Stream *stream = [spring track:adapter atts:atts];
...
// stop measurement programmatically
[stream stop];

If the stream should be measured again, when the application comes to the foreground or after the method stop has been called, the method track must be called again.

Once the application is in the background all measurements in the library are stopped, i.e. when the application goes to the foreground, the measurement on a stream must be restarted.

...
[[KMA_SpringStreams getInstance] unload];

//
//  KMA_MediaPlayerAdapter.m
//  KMA_SpringStreams
//
//  Created by Frank Kammann on 26.08.11.
//  Copyright 2011 spring GmbH & Co. KG. All rights reserved.
//

#import "KMA_SpringStreams.h"

/**
 * Implementation of a KMA_StreamAdapter.
 * 
 * @see KMA_StreamAdapter
 */
@implementation KMA_MediaPlayerAdapter

AVPlayerViewController *controller;
KMA_Player_Meta *meta;

/**
 * Initialize the adapter with the MPMoviePlayerController
 *
 * @see http://developer.apple.com/library/ios/#documentation/mediaplayer/reference/MPMoviePlayerController_Class/Reference/Reference.html
 * 
 */
- (KMA_MediaPlayerAdapter*)adapter:(AVPlayerViewController *)player {
    //if (self) {
        meta = [[KMA_Player_Meta alloc] init];
        meta.playername = @"AVPlayerViewController";
        controller = player;
    //}
    return [super init];
}

/**
 * Returns the meta object.
 *
 * @see MediaPlayerMeta
 */
- (KMA_Player_Meta*) getMeta {
    return meta;
}

/**
 * Returns the current position on the KMA_Stream in seconds by calling
 * the method MPMediaPlayback.currentPlaybackTime
 *
 * @see http://developer.apple.com/library/ios/#documentation/mediaplayer/reference/MPMediaPlayback_protocol/Reference/Reference.html#//apple_ref/occ/intf/MPMediaPlayback#
 */
- (int) getPosition {
    int position = CMTimeGetSeconds(controller.player.currentItem.currentTime);
    // in initialize phase in controller this value is set to -2^31
    if(position < 0) position = 0;
    return position;
}

/**
 * Returns the duration of the KMA_Stream in seconds by calling
 * the method MPMediaPlayback.duration.
 *
 */
- (int) getDuration {
    return CMTimeGetSeconds(controller.player.currentItem.duration);
}

/**
 * Returns the width by the controller view.
 *
 * @return contoller.view.bound.size.width
 */
- (int) getWidth {
    return controller.view.bounds.size.width;
}

/**
 * Returns the height by the controller view.
 *
 * @return contoller.view.bound.size.height
 */
- (int) getHeight {
    return controller.view.bounds.size.height;
}

@end



@implementation KMA_Player_Meta

/**
 * Returns the player name
 *
 * @return the string "MediaPlayer"
 */
@synthesize playername;

/**
 * Returns the player version.
 * The itselfs has no version so the system version is delivered.
 *
 * @see http://developer.apple.com/library/ios/#documentation/uikit/reference/UIDevice_Class/Reference/UIDevice.html
 *
 * @return The version my calling [UIDevice currentDevice].systemVersion
 */
@synthesize playerversion;

/**
 * Returns the screen width my calling the method
 * [[UIScreen mainScreen] bounds].screenRect.size.width
 *
 * @see http://developer.apple.com/library/ios/#documentation/uikit/reference/UIScreen_Class/Reference/UIScreen.html
 *
 * @return the width
 */
@synthesize screenwidth;

/**
 * Returns the screen width my calling the method
 * [[UIScreen mainScreen] bounds].screenRect.size.height
 *
 * @see http://developer.apple.com/library/ios/#documentation/uikit/reference/UIScreen_Class/Reference/UIScreen.html
 *
 * @return the height
 */
@synthesize screenheight;

- (id) init {
    self = [super init];
    if (self) {
        self.playername = @"iOS Player";
        self.playerversion = [UIDevice currentDevice].systemVersion;
        
        CGRect screenRect = [[UIScreen mainScreen] bounds];
        self.screenwidth = screenRect.size.width;
        self.screenheight = screenRect.size.height;
    }
    return self;
}

- (id) copyWithZone:(NSZone *)zone {
    id copy = [[[self class] alloc] init];
    
    if (copy) {
        // Copy NSObject subclasses
        [copy setPlayername:[self.playername copyWithZone:zone]];
        [copy setPlayerversion:[self.playerversion copyWithZone:zone]];
        
        // Set primitives
        [copy setScreenwidth:self.screenwidth];
        [copy setScreenheight:self.screenheight];
    }
    return copy;
}
reason:@"player
may- not be null"(NSString *)description {
    return [NSString stringWithFormat:@"Meta pl=%@ plv=%@    sx=%ld sy=%ld",
            self.playername,
            self.playerversion,
   userInfo:nil];         controller = player;(long)self.screenwidth,
      }     return (long)self.screenheight];
}

- (NSString*) getPlayerName {(void)encodeWithCoder:(NSCoder *)encoder {
    [encoder encodeObject:self.playername forKey:@"playername"];
     return [encoder encodeObject:self.playerversion forKey:@"MediaPlayerplayerversion"];
}   - (NSString*) getPlayerVersion { [encoder encodeInt:self.screenwidth forKey:@"screenwidth"];
    return [UIDevice currentDevice].systemVersion[encoder encodeInt:self.screenheight forKey:@"screenheight"];
}

- (intid) getScreenWidthinitWithCoder:(NSCoder *)decoder {
    CGRectself.playername screenRect = [[UIScreen mainScreen] bounds];decoder decodeObjectForKey:@"playername"];
    self.playerversion = return screenRect.size.width;
}

- (int) getScreenHeight {
[decoder decodeObjectForKey:@"playerversion"];
    self.screenwidth = [decoder decodeIntForKey:@"screenwidth"];
   CGRect screenRectself.screenheight = [[UIScreen mainScreen] boundsdecoder decodeIntForKey:@"screenheight"];
    return screenRect.size.heightself;
}

@end