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我正在为 iOS 上的 AVSampleBufferDisplayLayer 苦苦挣扎。我想使用这一层显示一个 CVPixelBuffer，但我无法让它在实际的 iOS 设备上工作。在我的示例应用程序中，我尝试使用以下代码来显示一个颜色像素缓冲区：

@implementation ViewController {
    AVSampleBufferDisplayLayer *videoLayer;
}

- (void)viewDidLoad {
    [super viewDidLoad];

    videoLayer = [[AVSampleBufferDisplayLayer alloc] init];
    videoLayer.frame = CGRectMake(50, 50, 300, 300);
    videoLayer.videoGravity = AVLayerVideoGravityResizeAspectFill;

    [self.view.layer addSublayer:videoLayer];
}

@implementation ViewController {
    AVSampleBufferDisplayLayer *videoLayer;
}

- (void)viewDidLoad {
    [super viewDidLoad];

    videoLayer = [[AVSampleBufferDisplayLayer alloc] init];
    videoLayer.frame = CGRectMake(50, 50, 300, 300);
    videoLayer.videoGravity = AVLayerVideoGravityResizeAspectFill;

    [self.view.layer addSublayer:videoLayer];
}

- (void)viewDidAppear:(BOOL)animated {
    [super viewDidAppear:animated];
    [self startVideo];
}

- (void)startVideo {
    [self drawPixelBuffer];
    [NSTimer scheduledTimerWithTimeInterval:0.1 target:self …