VLCMovieViewController.m 21.4 KB
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//
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//  VLCMovieViewController.m
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//  AspenProject
//
//  Created by Felix Paul Kühne on 27.02.13.
//  Copyright (c) 2013 VideoLAN. All rights reserved.
//

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#import "VLCMovieViewController.h"
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#import "VLCExternalDisplayController.h"
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#import <sys/sysctl.h> // for sysctlbyname
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#define INPUT_RATE_DEFAULT  1000.

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@interface VLCMovieViewController () <UIGestureRecognizerDelegate>
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{
    BOOL _shouldResumePlaying;
}

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@property (nonatomic, strong) UIPopoverController *masterPopoverController;
@property (nonatomic, strong) UIWindow *externalWindow;
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@end

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@implementation VLCMovieViewController
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- (void)dealloc
{
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    [[NSNotificationCenter defaultCenter] removeObserver:self];
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}

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#pragma mark - Managing the media item
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- (void)setMediaItem:(id)newMediaItem
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{
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    if (_mediaItem != newMediaItem)
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        _mediaItem = newMediaItem;
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    if (self.masterPopoverController != nil)
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        [self.masterPopoverController dismissPopoverAnimated:YES];
}

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- (void)viewDidLoad
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{
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    [super viewDidLoad];
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    self.wantsFullScreenLayout = YES;

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    self.videoFilterView.hidden = YES;
    _videoFiltersHidden = YES;
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    _hueLabel.text = NSLocalizedString(@"VFILTER_HUE", @"");
    _contrastLabel.text = NSLocalizedString(@"VFILTER_CONTRAST", @"");
    _brightnessLabel.text = NSLocalizedString(@"VFILTER_BRIGHTNESS", @"");
    _saturationLabel.text = NSLocalizedString(@"VFILTER_SATURATION", @"");
    _gammaLabel.text = NSLocalizedString(@"VFILTER_GAMMA", @"");
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    self.playbackSpeedView.hidden = YES;
    _playbackSpeedViewHidden = YES;
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    NSNotificationCenter *center = [NSNotificationCenter defaultCenter];
    [center addObserver:self selector:@selector(handleExternalScreenDidConnect:)
                   name:UIScreenDidConnectNotification object:nil];
    [center addObserver:self selector:@selector(handleExternalScreenDidDisconnect:)
                   name:UIScreenDidDisconnectNotification object:nil];
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    [center addObserver:self selector:@selector(applicationWillResignActive:)
                   name:UIApplicationWillResignActiveNotification object:nil];
    [center addObserver:self selector:@selector(applicationDidBecomeActive:)
                   name:UIApplicationDidBecomeActiveNotification object:nil];
    [center addObserver:self selector:@selector(applicationDidEnterBackground:)
                   name:UIApplicationDidEnterBackgroundNotification object:nil];
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    _playingExternallyTitle.text = NSLocalizedString(@"PLAYING_EXTERNALLY_TITLE", @"");
    _playingExternallyDescription.text = NSLocalizedString(@"PLAYING_EXTERNALLY_DESC", @"");
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    if ([self hasExternalDisplay])
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        [self showOnExternalDisplay];
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    _movieView.userInteractionEnabled = NO;
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    UITapGestureRecognizer *recognizer = [[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(toggleControlsVisible)];
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    recognizer.delegate = self;
    [self.view addGestureRecognizer:recognizer];
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    _aspectRatios = @[@"Default", @"4:3", @"16:9", @"16:10", @"2.21:1"];
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}
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- (void)viewWillAppear:(BOOL)animated
{
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    NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];
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    NSArray *options = @[[[defaults objectForKey:kVLCSettingVerboseOutput] intValue] ? kVLCSettingVerboseOutputOnValue : kVLCSettingVerboseOutputOffValue,
                         [[defaults objectForKey:kVLCSettingStretchAudio] intValue] ? kVLCSettingStretchAudioOnValue : kVLCSettingStretchAudioOffValue,
                         [NSString stringWithFormat:@"--subsdec-encoding=%@",[defaults objectForKey:kVLCSettingTextEncoding]]];
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    _mediaPlayer = [[VLCMediaPlayer alloc] initWithOptions:options];
    [_mediaPlayer setDelegate:self];
    [_mediaPlayer setDrawable:self.movieView];

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    [self.navigationController setNavigationBarHidden:YES animated:YES];
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    if (UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPhone)
        [UIApplication sharedApplication].statusBarStyle = UIStatusBarStyleBlackTranslucent;
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    if (!self.mediaItem && !self.url)
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        return;
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    if (self.mediaItem) {
        self.title = [self.mediaItem title];
        [_mediaPlayer setMedia:[VLCMedia mediaWithURL:[NSURL URLWithString:self.mediaItem.url]]];
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        self.mediaItem.unread = @0;
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    } else {
        [_mediaPlayer setMedia:[VLCMedia mediaWithURL:self.url]];
        self.title = @"Network Stream";
    }
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    self.positionSlider.value = 0.;

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    [super viewWillAppear:animated];

    if (![self _isMediaSuitableForDevice]) {
        UIAlertView * alert = [[UIAlertView alloc] initWithTitle:NSLocalizedString(@"DEVICE_TOOSLOW_TITLE", @"") message:[NSString stringWithFormat:NSLocalizedString(@"DEVICE_TOOSLOW", @""), [[UIDevice currentDevice] model], self.mediaItem.title] delegate:self cancelButtonTitle:NSLocalizedString(@"BUTTON_CANCEL", @"") otherButtonTitles:NSLocalizedString(@"BUTTON_OPEN", @""), nil];
        [alert show];
    } else
        [self _playNewMedia];
}

- (BOOL)_isMediaSuitableForDevice
{
    if (!self.mediaItem)
        return YES;

    NSUInteger totalNumberOfPixels = [[[self.mediaItem videoTrack] valueForKey:@"width"] doubleValue] * [[[self.mediaItem videoTrack] valueForKey:@"height"] doubleValue];

    size_t size;
    sysctlbyname("hw.machine", NULL, &size, NULL, 0);

    char *answer = malloc(size);
    sysctlbyname("hw.machine", answer, &size, NULL, 0);

    NSString *currentMachine = @(answer);
    free(answer);

    if ([currentMachine hasPrefix:@"iPhone2"] || [currentMachine hasPrefix:@"iPhone3"] || [currentMachine hasPrefix:@"iPad1"] || [currentMachine hasPrefix:@"iPod3"] || [currentMachine hasPrefix:@"iPod4"]) {
        // iPhone 3GS, iPhone 4, first gen. iPad, 3rd and 4th generation iPod touch
        APLog(@"this is a cat one device");
        return (totalNumberOfPixels < 600000); // between 480p and 720p
    } else if ([currentMachine hasPrefix:@"iPhone4"] || [currentMachine hasPrefix:@"iPad3,1"] || [currentMachine hasPrefix:@"iPad3,2"] || [currentMachine hasPrefix:@"iPad3,3"] || [currentMachine hasPrefix:@"iPod4"] || [currentMachine hasPrefix:@"iPad2"] || [currentMachine hasPrefix:@"iPod5"]) {
        // iPhone 4S, iPad 2 and 3, iPod 4 and 5
        APLog(@"this is a cat two device");
        return (totalNumberOfPixels < 922000); // 720p
    } else {
        // iPhone 5, iPad 4
        APLog(@"this is a cat three device");
        return (totalNumberOfPixels < 2074000); // 1080p
    }

    return YES;
}

- (void)alertView:(UIAlertView *)alertView clickedButtonAtIndex:(NSInteger)buttonIndex
{
    if (buttonIndex == 1)
        [self _playNewMedia];
    else
        [self closePlayback:nil];
}

- (void)_playNewMedia
{
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    [_mediaPlayer play];
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    if (self.mediaItem.lastPosition && [self.mediaItem.lastPosition floatValue] < 0.99)
        [_mediaPlayer setPosition:[self.mediaItem.lastPosition floatValue]];
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    self.playbackSpeedSlider.value = [self _playbackSpeed];
    [self _updatePlaybackSpeedIndicator];
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    _currentAspectRatioMask = 0;
    _mediaPlayer.videoAspectRatio =  NULL;
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    [self resetIdleTimer];
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}

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- (void)viewWillDisappear:(BOOL)animated
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{
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    if (_idleTimer) {
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        [_idleTimer invalidate];
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        _idleTimer = nil;
    }
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    [self.navigationController setNavigationBarHidden:NO animated:YES];
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    [UIApplication sharedApplication].statusBarStyle = UIStatusBarStyleBlackOpaque;
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    [_mediaPlayer pause];
    [super viewWillDisappear:animated];
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    if (self.mediaItem)
        self.mediaItem.lastPosition = @([_mediaPlayer position]);
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    [_mediaPlayer stop];
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    _mediaPlayer = nil; // save memory and some CPU time
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}

- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
    self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
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    if (self)
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        self.title = @"Video Playback";
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    return self;
}
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#pragma mark - remote events

- (void)viewDidAppear:(BOOL)animated
{
    [super viewDidAppear:animated];
    [[UIApplication sharedApplication] beginReceivingRemoteControlEvents];
    [self becomeFirstResponder];
}

- (void)viewDidDisappear:(BOOL)animated
{
    [super viewDidDisappear:animated];
    [[UIApplication sharedApplication] endReceivingRemoteControlEvents];
    [self resignFirstResponder];
}

- (BOOL)canBecomeFirstResponder
{
    return YES;
}

- (void)remoteControlReceivedWithEvent:(UIEvent *)event
{
    switch (event.subtype) {
        case UIEventSubtypeRemoteControlPlay:
            [_mediaPlayer play];
            break;
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        case UIEventSubtypeRemoteControlPause:
            [_mediaPlayer pause];
            break;

        case UIEventSubtypeRemoteControlTogglePlayPause:
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            [self playPause];
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            break;

        default:
            break;
    }
}

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#pragma mark - controls visibility

- (BOOL)gestureRecognizer:(UIGestureRecognizer *)gestureRecognizer shouldReceiveTouch:(UITouch *)touch
{
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    if (touch.view != self.view)
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        return NO;

    return YES;
}

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- (void)toggleControlsVisible
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{
    _controlsHidden = !_controlsHidden;
    CGFloat alpha = _controlsHidden? 0.0f: 1.0f;

    if (!_controlsHidden) {
        _controllerPanel.alpha = 0.0f;
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        _controllerPanel.hidden = !_videoFiltersHidden;
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        _toolbar.alpha = 0.0f;
        _toolbar.hidden = NO;
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        _videoFilterView.alpha = 0.0f;
        _videoFilterView.hidden = _videoFiltersHidden;
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        _playbackSpeedView.alpha = 0.0f;
        _playbackSpeedView.hidden = _playbackSpeedViewHidden;
        _playbackSpeedButton.alpha = 0.0f;
        _playbackSpeedButton.hidden = NO;
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        _videoFilterButton.alpha = 0.0f;
        _videoFilterButton.hidden = NO;
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        _aspectRatioButton.alpha = 0.0f;
        _aspectRatioButton.hidden = NO;
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    }

    void (^animationBlock)() = ^() {
        _controllerPanel.alpha = alpha;
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        _toolbar.alpha = alpha;
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        _videoFilterView.alpha = alpha;
        _videoFilterButton.alpha = alpha;
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        _playbackSpeedView.alpha = alpha;
        _playbackSpeedButton.alpha = alpha;
        _videoFilterButton.alpha = alpha;
        _aspectRatioButton.alpha = alpha;
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    };

    void (^completionBlock)(BOOL finished) = ^(BOOL finished) {
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        if (_videoFiltersHidden) {
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            _controllerPanel.hidden = _controlsHidden;
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            _playbackSpeedButton.hidden = _controlsHidden;
            _videoFilterButton.hidden = _controlsHidden;
            _aspectRatioButton.hidden = _controlsHidden;
        } else {
            _controllerPanel.hidden = NO;
            _playbackSpeedButton.hidden = NO;
            _videoFilterButton.hidden = NO;
            _aspectRatioButton.hidden = NO;
        }
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        _toolbar.hidden = _controlsHidden;
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        _videoFilterView.hidden = _videoFiltersHidden;
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        if (_controlsHidden)
            _playbackSpeedView.hidden = YES;
        else
            _playbackSpeedView.hidden = _playbackSpeedViewHidden;
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    };

    [UIView animateWithDuration:0.3f animations:animationBlock completion:completionBlock];
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    [[UIApplication sharedApplication] setStatusBarHidden:_controlsHidden withAnimation:UIStatusBarAnimationFade];
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}

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- (void)resetIdleTimer
{
    if (!_idleTimer)
        _idleTimer = [NSTimer scheduledTimerWithTimeInterval:2.
                                                      target:self
                                                    selector:@selector(idleTimerExceeded)
                                                    userInfo:nil
                                                     repeats:NO];
    else {
        if (fabs([_idleTimer.fireDate timeIntervalSinceNow]) < 2.)
            [_idleTimer setFireDate:[NSDate dateWithTimeIntervalSinceNow:2.]];
    }
}

- (void)idleTimerExceeded
{
    _idleTimer = nil;
    if (!_controlsHidden)
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        [self toggleControlsVisible];
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}

- (UIResponder *)nextResponder
{
    [self resetIdleTimer];
    return [super nextResponder];
}

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#pragma mark - controls

- (IBAction)closePlayback:(id)sender
{
    [self.navigationController popViewControllerAnimated:YES];
}

- (IBAction)positionSliderAction:(UISlider *)sender
{
    _mediaPlayer.position = sender.value;
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    [self resetIdleTimer];
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}

- (void)mediaPlayerTimeChanged:(NSNotification *)aNotification {
    self.positionSlider.value = [_mediaPlayer position];
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    self.timeDisplay.text = [[_mediaPlayer remainingTime] stringValue];
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}

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- (void)mediaPlayerStateChanged:(NSNotification *)aNotification
{
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    VLCMediaPlayerState currentState = _mediaPlayer.state;

    if (currentState == VLCMediaPlayerStateError) {
        [self.statusLabel showStatusMessage:NSLocalizedString(@"PLAYBACK_FAILED", @"")];
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        [self performSelector:@selector(closePlayback:) withObject:nil afterDelay:2.];
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    }

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    if (currentState == VLCMediaPlayerStateEnded || currentState == VLCMediaPlayerStateStopped)
        [self performSelector:@selector(closePlayback:) withObject:nil afterDelay:2.];

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    UIImage *playPauseImage = [_mediaPlayer isPlaying]? [UIImage imageNamed:@"pause"] : [UIImage imageNamed:@"play"];
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    [_playPauseButton setImage:playPauseImage forState:UIControlStateNormal];
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    if ([[_mediaPlayer audioTrackIndexes] count] > 2)
        self.audioSwitcherButton.hidden = NO;
    else
        self.audioSwitcherButton.hidden = YES;

    if ([[_mediaPlayer videoSubTitlesIndexes] count] > 1)
        self.subtitleSwitcherButton.hidden = NO;
    else
        self.subtitleSwitcherButton.hidden = YES;
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}

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- (IBAction)playPause
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{
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    if ([_mediaPlayer isPlaying])
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        [_mediaPlayer pause];
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    else
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        [_mediaPlayer play];
}

- (IBAction)forward:(id)sender
{
    [_mediaPlayer mediumJumpForward];
}

- (IBAction)backward:(id)sender
{
    [_mediaPlayer mediumJumpBackward];
}

- (IBAction)switchAudioTrack:(id)sender
{
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    _audiotrackActionSheet = [[UIActionSheet alloc] initWithTitle:NSLocalizedString(@"CHOOSE_AUDIO_TRACK", @"audio track selector") delegate:self cancelButtonTitle:nil destructiveButtonTitle:nil otherButtonTitles: nil];
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    NSArray *audioTracks = [_mediaPlayer audioTrackNames];
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    NSUInteger count = [audioTracks count];
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    for (NSUInteger i = 0; i < count; i++)
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        [_audiotrackActionSheet addButtonWithTitle:audioTracks[i]];
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    [_audiotrackActionSheet addButtonWithTitle:NSLocalizedString(@"BUTTON_CANCEL", @"cancel button")];
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    [_audiotrackActionSheet setCancelButtonIndex:[_audiotrackActionSheet numberOfButtons] - 1];
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    [_audiotrackActionSheet showInView:self.audioSwitcherButton];
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}

- (IBAction)switchSubtitleTrack:(id)sender
{
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    NSArray *spuTracks = [_mediaPlayer videoSubTitlesNames];
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    NSUInteger count = [spuTracks count];
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    if (count <= 1)
        return;
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    _subtitleActionSheet = [[UIActionSheet alloc] initWithTitle:NSLocalizedString(@"CHOOSE_SUBTITLE_TRACK", @"subtitle track selector") delegate:self cancelButtonTitle:nil destructiveButtonTitle:nil otherButtonTitles: nil];
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    for (NSUInteger i = 0; i < count; i++)
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        [_subtitleActionSheet addButtonWithTitle:spuTracks[i]];
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    [_subtitleActionSheet addButtonWithTitle:NSLocalizedString(@"BUTTON_CANCEL", @"cancel button")];
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    [_subtitleActionSheet setCancelButtonIndex:[_subtitleActionSheet numberOfButtons] - 1];
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    [_subtitleActionSheet showInView: self.subtitleSwitcherButton];
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}

- (void)actionSheet:(UIActionSheet *)actionSheet clickedButtonAtIndex:(NSInteger)buttonIndex {
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    NSUInteger arrayIndex = 0;
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    NSArray *indexArray;
    NSArray *namesArray;
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    if (actionSheet == _subtitleActionSheet) {
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        namesArray = _mediaPlayer.videoSubTitlesNames;
        arrayIndex = [namesArray indexOfObject:[actionSheet buttonTitleAtIndex:buttonIndex]];
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        if (arrayIndex != NSNotFound) {
            indexArray = _mediaPlayer.videoSubTitlesIndexes;
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            _mediaPlayer.currentVideoSubTitleIndex = [indexArray[arrayIndex] intValue];
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        }
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    } else if (actionSheet == _audiotrackActionSheet) {
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        namesArray = _mediaPlayer.audioTrackNames;
        arrayIndex = [namesArray indexOfObject:[actionSheet buttonTitleAtIndex:buttonIndex]];
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        if (arrayIndex != NSNotFound) {
            indexArray = _mediaPlayer.audioTrackIndexes;
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            _mediaPlayer.currentAudioTrackIndex = [indexArray[arrayIndex] intValue];
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        }
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    }
}

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#pragma mark - Video Filter UI

- (IBAction)videoFilterToggle:(id)sender
{
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    if (!_playbackSpeedViewHidden)
        self.playbackSpeedView.hidden = _playbackSpeedViewHidden = YES;
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    self.videoFilterView.hidden = !_videoFiltersHidden;
    _videoFiltersHidden = self.videoFilterView.hidden;
    self.controllerPanel.hidden = !_videoFiltersHidden;
}

- (IBAction)videoFilterSliderAction:(id)sender
{
    if (sender == self.hueSlider)
        _mediaPlayer.hue = (int)self.hueSlider.value;
    else if (sender == self.contrastSlider)
        _mediaPlayer.contrast = self.contrastSlider.value;
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    else if (sender == self.brightnessSlider) {
        if ([self hasExternalDisplay])
            _mediaPlayer.brightness = self.brightnessSlider.value;
        else
            [[UIScreen mainScreen] setBrightness:(self.brightnessSlider.value / 2.)];
    } else if (sender == self.saturationSlider)
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        _mediaPlayer.saturation = self.saturationSlider.value;
    else if (sender == self.gammaSlider)
        _mediaPlayer.gamma = self.gammaSlider.value;
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    else if (sender == self.resetVideoFilterButton) {
        _mediaPlayer.hue = self.hueSlider.value = 0.;
        _mediaPlayer.contrast = self.contrastSlider.value = 1.;
        _mediaPlayer.brightness = self.brightnessSlider.value = 1.;
        _mediaPlayer.saturation = self.saturationSlider.value = 1.;
        _mediaPlayer.gamma = self.gammaSlider.value = 1.;
    } else
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        APLog(@"unknown sender for videoFilterSliderAction");
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    [self resetIdleTimer];
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}

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#pragma mark - playback view
- (IBAction)playbackSpeedSliderAction:(UISlider *)sender
{
    double speed = pow(2, sender.value / 17.);
    float rate = INPUT_RATE_DEFAULT / speed;
    if (_currentPlaybackRate != rate)
        [_mediaPlayer setRate:INPUT_RATE_DEFAULT / rate];
    _currentPlaybackRate = rate;
    [self _updatePlaybackSpeedIndicator];
    [self resetIdleTimer];
}

- (void)_updatePlaybackSpeedIndicator
{
    float f_value = self.playbackSpeedSlider.value;
    double speed =  pow(2, f_value / 17.);
    self.playbackSpeedIndicator.text = [NSString stringWithFormat:@"%.2fx", speed];
}

- (float)_playbackSpeed
{
    float f_rate = _mediaPlayer.rate;

    double value = 17 * log(f_rate) / log(2.);
    float returnValue = (int) ((value > 0) ? value + .5 : value - .5);

    if (returnValue < -34.)
        returnValue = -34.;
    else if (returnValue > 34.)
        returnValue = 34.;

    _currentPlaybackRate = returnValue;
    return returnValue;
}

- (IBAction)videoDimensionAction:(id)sender
{
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    if (sender == self.playbackSpeedButton) {
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        if (!_videoFiltersHidden)
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            self.videoFilterView.hidden = _videoFiltersHidden = YES;
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        self.playbackSpeedView.hidden = !_playbackSpeedViewHidden;
        _playbackSpeedViewHidden = self.playbackSpeedView.hidden;
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    } else if (sender == self.aspectRatioButton) {
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        NSUInteger count = [_aspectRatios count];

        if (_currentAspectRatioMask + 1 > count - 1) {
            _mediaPlayer.videoAspectRatio = NULL;
            _currentAspectRatioMask = 0;
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            [self.statusLabel showStatusMessage:[NSString stringWithFormat:NSLocalizedString(@"AR_CHANGED", @""), NSLocalizedString(@"DEFAULT", @"")]];
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        } else {
            _currentAspectRatioMask++;
            _mediaPlayer.videoAspectRatio = (char *)[_aspectRatios[_currentAspectRatioMask] UTF8String];
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            [self.statusLabel showStatusMessage:[NSString stringWithFormat:NSLocalizedString(@"AR_CHANGED", @""), _aspectRatios[_currentAspectRatioMask]]];
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        }
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    }
}

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#pragma mark - background interaction
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- (void)applicationWillResignActive:(NSNotification *)aNotification
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{
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    if (self.mediaItem)
        self.mediaItem.lastPosition = @([_mediaPlayer position]);
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    if (![[[NSUserDefaults standardUserDefaults] objectForKey:kVLCSettingContinueAudioInBackgroundKey] boolValue]) {
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        [_mediaPlayer pause];
        _shouldResumePlaying = YES;
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    } else
        _mediaPlayer.currentVideoTrackIndex = 0;
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}

- (void)applicationDidEnterBackground:(NSNotification *)notification
{
    _shouldResumePlaying = NO;
}

- (void)applicationDidBecomeActive:(NSNotification *)notification
{
    if (_shouldResumePlaying) {
        _shouldResumePlaying = NO;
        [_mediaPlayer play];
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    } else
        _mediaPlayer.currentVideoTrackIndex = 1;
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}

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#pragma mark - autorotation

- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)toInterfaceOrientation {
    return UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPad
           || toInterfaceOrientation != UIInterfaceOrientationMaskPortraitUpsideDown;
}

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#pragma mark - External Display

- (BOOL)hasExternalDisplay
{
    return ([[UIScreen screens] count] > 1);
}

- (void)showOnExternalDisplay
{
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    UIScreen *screen = [UIScreen screens][1];
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    screen.overscanCompensation = UIScreenOverscanCompensationInsetApplicationFrame;

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    self.externalWindow = [[UIWindow alloc] initWithFrame:screen.bounds];
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    UIViewController *controller = [[VLCExternalDisplayController alloc] init];
    self.externalWindow.rootViewController = controller;
    [controller.view addSubview:_movieView];
    controller.view.frame = screen.bounds;
    _movieView.frame = screen.bounds;

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    self.playingExternallyView.hidden = NO;
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    self.externalWindow.screen = screen;
    self.externalWindow.hidden = NO;
}

- (void)hideFromExternalDisplay
{
    [self.view addSubview:_movieView];
    [self.view sendSubviewToBack:_movieView];
    _movieView.frame = self.view.frame;

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    self.playingExternallyView.hidden = YES;
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    self.externalWindow.hidden = YES;
    self.externalWindow = nil;
}

- (void)handleExternalScreenDidConnect:(NSNotification *)notification
{
    [self showOnExternalDisplay];
}

- (void)handleExternalScreenDidDisconnect:(NSNotification *)notification
{
    [self hideFromExternalDisplay];
}

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@end