I'm creating a simple menu-drive movie player and have run into a problem with
AVPlayerLayer. The first time I attach a player with a movie the playback is
fine. When a second movie is selected from the menu, I never receive a status
of -[AVPlayerLayer readyForDisplay] set to true. If I ignore this status the
player will play but I only get audio playback (no video). Investigating the
status of the view and associated layers involved shows that the layer for the
layer-backed (not hosted) view becomes nil after playing the first movie.
I have no idea how this is happening. I've included the relevant snippets
below because I'm probably looking right at the problem and not seeing it.
Hopefully someone out that has a little more experience with AVFoundation and
can give me a clue.
I'm using ARC.
@interface JTVMovieViewController : NSViewController
{
AVPlayerLayer* __strong playerLayer;
}
@property (assign) IBOutlet id<JTVMoviewViewDelegate> delegate;
@property (strong) IBOutlet NSButton* homeButton;
@property (strong) IBOutlet NSView* playerView;
- (void)awakeFromNib
{
playerLayer = [AVPlayerLayer layer];
playerLayer.frame = self.playerView.bounds;
playerLayer.videoGravity = AVLayerVideoGravityResizeAspect;
[playerLayer addObserver:self
forKeyPath:kReadyForDisplayKey
options:NSKeyValueObservingOptionNew
context:KVOPlayerLayerContext];
[self.playerView.layer addSublayer:playerLayer];
}
- (void)observeValueForKeyPath:(NSString*)keyPath
ofObject:(id)object
change:(NSDictionary*)change
context:(void*)context
{
if ( context == KVOMoviePlaylistContext )
{
[self startPlayingNewPlayer:[self.moviePlaylist selection]];
}
else if ( context == KVOPlayerLayerContext )
{
NSLog(@"Player layer %@ ready for display.",
playerLayer.readyForDisplay ? @"is" : @"is not");
if ( YES == playerLayer.readyForDisplay )
{
[playerLayer.player play];
}
}
}
- (void)startPlayingNewPlayer:(AVPlayer*)player
{
[playerLayer setPlayer:player];
if ( YES == playerLayer.readyForDisplay )
{
[player play];
}
[self.delegate controllerDidBeginVideoPlayback:self];
}
- (void)stopPlayback
{
[[playerLayer player] pause];
[[playerLayer player] seekToTime:kCMTimeZero]; // reset player
[playerLayer setPlayer:nil];
}
(lldb) po [self playerView]
(NSView *) $2 = 0x000000010bf83310 <NSView: 0x10bf83310>
(lldb) po [[self playerView] layer]
(id) $3 = 0x000000010bf833d0 <_NSViewBackingLayer:0x10bf833d0; position =
CGPoint (0 0); bounds = CGRect (0 0; 1920 1080); delegate = <NSView:
0x10bf83310>; backgroundFilters = (
); filters = (
); shadowColor = (null); anchorPoint = CGPoint (0 0)>
(lldb) po [[[self playerView] layer] sublayers]
(id) $4 = 0x000000010bf88880 <CALayerArray 0x10bf88880>(
<AVPlayerLayer:0x10bf84b50; position = CGPoint (960 540); bounds = CGRect (0 0;
1920 1080); >
)
(lldb) c
Process 96211 resuming
2011-12-29 08:35:33.421 JTVideoPlayer[96211:503] Player layer is ready for
display.
<< here is where I stop playback from the UI>
2011-12-29 08:36:35.289 JTVideoPlayer[96211:503] Player layer is not ready for
display.
(lldb) po [self playerView]
(NSView *) $13 = 0x000000010bf83310 <NSView: 0x10bf83310>
(lldb) po [[self playerView] layer]
(id) $14 = 0x0000000000000000 <nil>
(lldb) po [playerLayer superlayer]
(id) $15 = 0x0000000000000000 <nil>
(lldb)
-Michael
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