How to get video frame of the AVPlayer?

问题

I have PlayerView class for displaying AVPlayer's playback. Code from documentation.

#import <UIKit/UIKit.h>
#import <AVFoundation/AVFoundation.h>

@interface PlayerView : UIView
@property (nonatomic) AVPlayer *player;
@end

@implementation PlayerView
+ (Class)layerClass {
    return [AVPlayerLayer class];
}
- (AVPlayer*)player {
    return [(AVPlayerLayer *)[self layer] player];
}
- (void)setPlayer:(AVPlayer *)player {
    [(AVPlayerLayer *)[self layer] setPlayer:player];
}
@end

I set up my AVPlayer (contains video asset with size 320x240) in this PlayerView (with frame.size.width = 100, frame.size.height = 100) and my video is resized. How can i get size of video after adding in PlayerView?

回答1:

In iOS 7.0 added new feature:

AVPlayerLayer has property videoRect.

回答2:

Found a solution:

Add to PlayerView class:

- (CGRect)videoContentFrame {
    AVPlayerLayer *avLayer = (AVPlayerLayer *)[self layer];
    // AVPlayerLayerContentLayer
    CALayer *layer = (CALayer *)[[avLayer sublayers] objectAtIndex:0];
    CGRect transformedBounds = CGRectApplyAffineTransform(layer.bounds, CATransform3DGetAffineTransform(layer.sublayerTransform));
    return transformedBounds;
}

回答3:

Here's the solution that's working for me, takes into account the positioning of the AVPlayer within the view. I just added this to the PlayerView custom class. I had to solve this because doesn't appear that videoRect is working in 10.7.

- (NSRect) videoRect {
    NSRect theVideoRect = NSMakeRect(0,0,0,0);
    NSRect theLayerRect = self.playerLayer.frame;

    NSSize theNaturalSize = NSSizeFromCGSize([[[self.movie asset] tracksWithMediaType:AVMediaTypeVideo][0] naturalSize]);
    float movieAspectRatio = theNaturalSize.width/theNaturalSize.height;
    float viewAspectRatio = theLayerRect.size.width/theLayerRect.size.height;
    if (viewAspectRatio < movieAspectRatio) {
        theVideoRect.size.width = theLayerRect.size.width;
        theVideoRect.size.height = theLayerRect.size.width/movieAspectRatio;
        theVideoRect.origin.x = 0;
        theVideoRect.origin.y = (theLayerRect.size.height/2) - (theVideoRect.size.height/2);
}
    else if (viewAspectRatio > movieAspectRatio) {

        theVideoRect.size.width = movieAspectRatio * theLayerRect.size.height;
        theVideoRect.size.height = theLayerRect.size.height;
        theVideoRect.origin.x = (theLayerRect.size.width/2) - (theVideoRect.size.width/2);
        theVideoRect.origin.y = 0;
    }
    return theVideoRect;
}

回答4:

Here is Eric Badros' answer ported to iOS. I also added preferredTransform handling. This assumes _player is an AVPlayer

- (CGRect) videoRect {
    CGRect theVideoRect = CGRectZero;

    // Replace this with whatever frame your AVPlayer is playing inside of:
    CGRect theLayerRect = self.playerLayer.frame;

    AVAssetTrack *track = [_player.currentItem.asset tracksWithMediaType:AVMediaTypeVideo][0];
    CGSize theNaturalSize = [track naturalSize];
    theNaturalSize = CGSizeApplyAffineTransform(theNaturalSize, track.preferredTransform);
    theNaturalSize.width = fabs(theNaturalSize.width);
    theNaturalSize.height = fabs(theNaturalSize.height);

    CGFloat movieAspectRatio = theNaturalSize.width / theNaturalSize.height;
    CGFloat viewAspectRatio = theLayerRect.size.width / theLayerRect.size.height;

    // Note change this *greater than* to a *less than* if your video will play in aspect fit mode (as opposed to aspect fill mode)
    if (viewAspectRatio > movieAspectRatio) {
        theVideoRect.size.width = theLayerRect.size.width;
        theVideoRect.size.height = theLayerRect.size.width / movieAspectRatio;
        theVideoRect.origin.x = 0;
        theVideoRect.origin.y = (theLayerRect.size.height - theVideoRect.size.height) / 2;
    } else if (viewAspectRatio < movieAspectRatio) {
        theVideoRect.size.width = movieAspectRatio * theLayerRect.size.height;
        theVideoRect.size.height = theLayerRect.size.height;
        theVideoRect.origin.x = (theLayerRect.size.width - theVideoRect.size.width) / 2;
        theVideoRect.origin.y = 0;
    }
    return theVideoRect;
}

回答5:

This worked for me. When you don't have the AVPLayerLayer.

- (CGRect)videoRect {
    // @see http://stackoverflow.com/a/6565988/1545158

    AVAssetTrack *track = [[self.player.currentItem.asset tracksWithMediaType:AVMediaTypeVideo] firstObject];
    if (!track) {
        return CGRectZero;
    }

    CGSize trackSize = [track naturalSize];
    CGSize videoViewSize = self.videoView.bounds.size;

    CGFloat trackRatio = trackSize.width / trackSize.height;
    CGFloat videoViewRatio = videoViewSize.width / videoViewSize.height;

    CGSize newSize;

    if (videoViewRatio > trackRatio) {
        newSize = CGSizeMake(trackSize.width * videoViewSize.height / trackSize.height, videoViewSize.height);
    } else {
        newSize = CGSizeMake(videoViewSize.width, trackSize.height * videoViewSize.width / trackSize.width);
    }

    CGFloat newX = (videoViewSize.width - newSize.width) / 2;
    CGFloat newY = (videoViewSize.height - newSize.height) / 2;

    return CGRectMake(newX, newY, newSize.width, newSize.height);

}

来源：https://stackoverflow.com/questions/12091315/how-to-get-video-frame-of-the-avplayer