[英]OSX Screencapturing using AVScreenCaptureInput
在我的Mac應用程序中,我需要抓取屏幕並將其發送到另一端,
AVCaptureSession有可能嗎?
如果是,我只需要RGB或YUV數據而不是音頻,是否可以對其進行配置?
如果不是AVFoundation類/框架,那么推薦哪個?
如果想要連續的yuv圖像流,可以執行以下操作:
#import <AVFoundation/AVFoundation.h>
@interface ScreenCapture() <AVCaptureVideoDataOutputSampleBufferDelegate>
@property (nonatomic) AVCaptureSession *captureSession;
@end
@implementation ScreenCapture
- (instancetype)init
{
self = [super init];
if (self) {
self.captureSession = [[AVCaptureSession alloc] init];
AVCaptureScreenInput *input = [[AVCaptureScreenInput alloc] initWithDisplayID:CGMainDisplayID()];
[self.captureSession addInput:input];
AVCaptureVideoDataOutput *output = [[AVCaptureVideoDataOutput alloc] init];
[self.captureSession addOutput:output];
// TODO: create a dedicated queue.
[output setSampleBufferDelegate:self queue:dispatch_get_main_queue()];
[self.captureSession startRunning];
}
return self;
}
- (void)captureOutput:(AVCaptureOutput *)captureOutput didOutputSampleBuffer:(CMSampleBufferRef)sampleBuffer fromConnection:(AVCaptureConnection *)connection {
// sampleBuffer contains screen cap, for me it's yuv
}
@end
這給我約15fps。 您可以通過降低最低幀頻來獲得更高的幀頻:
input.minFrameDuration = CMTimeMake(1, 60);
有關更成熟的實現和更多錯誤檢查的實現,請參閱Apple的AVScreenShack示例代碼 。
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