examples/iOS/SimpleVideoFileFilter/SimpleVideoFileFilter/SimpleVideoFileFilterViewController.m
#import "SimpleVideoFileFilterViewController.h"

@implementation SimpleVideoFileFilterViewController

- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
    self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
    if (self) {
    }
    return self;
}

- (void)didReceiveMemoryWarning
{
    [super didReceiveMemoryWarning];
}

#pragma mark - View lifecycle

- (void)viewDidLoad
{
    [super viewDidLoad];
  
    NSURL *sampleURL = [[NSBundle mainBundle] URLForResource:@"sample_iPod" withExtension:@"m4v"];
    
    movieFile = [[GPUImageMovie alloc] initWithURL:sampleURL];
    movieFile.runBenchmark = YES;
    movieFile.playAtActualSpeed = NO;
    filter = [[GPUImagePixellateFilter alloc] init];
//    filter = [[GPUImageUnsharpMaskFilter alloc] init];
    
    [movieFile addTarget:filter];

    // Only rotate the video for display, leave orientation the same for recording
    GPUImageView *filterView = (GPUImageView *)self.view;
    [filter addTarget:filterView];

    // In addition to displaying to the screen, write out a processed version of the movie to disk
    NSString *pathToMovie = [NSHomeDirectory() stringByAppendingPathComponent:@"Documents/Movie.m4v"];
    unlink([pathToMovie UTF8String]); // If a file already exists, AVAssetWriter won't let you record new frames, so delete the old movie
    NSURL *movieURL = [NSURL fileURLWithPath:pathToMovie];

    movieWriter = [[GPUImageMovieWriter alloc] initWithMovieURL:movieURL size:CGSizeMake(640.0, 480.0)];
    [filter addTarget:movieWriter];

    // Configure this for video from the movie file, where we want to preserve all video frames and audio samples
    movieWriter.shouldPassthroughAudio = YES;
    movieFile.audioEncodingTarget = movieWriter;
    [movieFile enableSynchronizedEncodingUsingMovieWriter:movieWriter];
    
    [movieWriter startRecording];
    [movieFile startProcessing];
    
    timer = [NSTimer scheduledTimerWithTimeInterval:0.3f
                                             target:self
                                           selector:@selector(retrievingProgress)
                                           userInfo:nil
                                            repeats:YES];
    
    [movieWriter setCompletionBlock:^{
        [filter removeTarget:movieWriter];
        [movieWriter finishRecording];
        
        dispatch_async(dispatch_get_main_queue(), ^{
            [timer invalidate];
            self.progressLabel.text = @"100%";
        });
    }];
}

- (void)retrievingProgress
{
    self.progressLabel.text = [NSString stringWithFormat:@"%d%%", (int)(movieFile.progress * 100)];
}

- (void)viewDidUnload
{
    [self setProgressLabel:nil];
    [super viewDidUnload];
}

- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
{
    return (interfaceOrientation == UIInterfaceOrientationPortrait);
}

- (IBAction)updatePixelWidth:(id)sender
{
//    [(GPUImageUnsharpMaskFilter *)filter setIntensity:[(UISlider *)sender value]];
    [(GPUImagePixellateFilter *)filter setFractionalWidthOfAPixel:[(UISlider *)sender value]];
}

- (void)dealloc {
    [_progressLabel release];
    [super dealloc];
}
@end
