paoloandrea / PBJVision

iOS camera engine, features touch-to-record video, slow motion video, and photo capture

PBJVision

PBJVision is an iOS camera engine library that supports touch-to-record video, slow motion video (120 fps on supported hardware), and photo capture.

The library also supports features such as onion skinning (ghosting), flash/torch usage, white balance adjustment, focus adjustment, exposure adjustment, and mirroring. Pause and resume video capture is also possible without having to use the touch-to-record gesture interaction as the sample project provides.

I created this library at DIY as a fun means for young people to author video and share their skills. The touch-to-record interaction was originally pioneered by Vine and also adopted by Instagram. Thanks to everyone who has contributed and helped make this a fun project and community.

If you need a video player, check out PBJVideoPlayer (obj-c) and Player (Swift).

Please review the release history for a summary of the latest changes and more information.

Contributions are welcome!

Installation

CocoaPods is the recommended method of installing PBJVision, just add the following line to your Podfile:

pod 'PBJVision'

Usage

Import the header.

#import "PBJVision.h"

Setup the camera preview using [[PBJVision sharedInstance] previewLayer].

    // preview and AV layer
    _previewView = [[UIView alloc] initWithFrame:CGRectZero];
    _previewView.backgroundColor = [UIColor blackColor];
    CGRect previewFrame = CGRectMake(0, 60.0f, CGRectGetWidth(self.view.frame), CGRectGetWidth(self.view.frame));
    _previewView.frame = previewFrame;
    _previewLayer = [[PBJVision sharedInstance] previewLayer];
    _previewLayer.frame = _previewView.bounds;
    _previewLayer.videoGravity = AVLayerVideoGravityResizeAspectFill;
    [_previewView.layer addSublayer:_previewLayer];

Setup and configure the PBJVision controller, then start the camera preview.

- (void)_setup
{
    _longPressGestureRecognizer.enabled = YES;

    PBJVision *vision = [PBJVision sharedInstance];
    vision.delegate = self;
    vision.cameraMode = PBJCameraModeVideo;
    vision.cameraOrientation = PBJCameraOrientationPortrait;
    vision.focusMode = PBJFocusModeContinuousAutoFocus;
    vision.outputFormat = PBJOutputFormatSquare;

    [vision startPreview];
}

Start/pause/resume recording.

- (void)_handleLongPressGestureRecognizer:(UIGestureRecognizer *)gestureRecognizer
{
    switch (gestureRecognizer.state) {
      case UIGestureRecognizerStateBegan:
        {
            if (!_recording)
                [[PBJVision sharedInstance] startVideoCapture];
            else
                [[PBJVision sharedInstance] resumeVideoCapture];
            break;
        }
      case UIGestureRecognizerStateEnded:
      case UIGestureRecognizerStateCancelled:
      case UIGestureRecognizerStateFailed:
        {
            [[PBJVision sharedInstance] pauseVideoCapture];
            break;
        }
      default:
        break;
    }
}

End recording.

    [[PBJVision sharedInstance] endVideoCapture];

Handle the final video output or error accordingly.

- (void)vision:(PBJVision *)vision capturedVideo:(NSDictionary *)videoDict error:(NSError *)error
{   
    if (error && [error.domain isEqual:PBJVisionErrorDomain] && error.code == PBJVisionErrorCancelled) {
        NSLog(@"recording session cancelled");
        return;
    } else if (error) {
        NSLog(@"encounted an error in video capture (%@)", error);
        return;
    }

    _currentVideo = videoDict;
    
    NSString *videoPath = [_currentVideo  objectForKey:PBJVisionVideoPathKey];
    [_assetLibrary writeVideoAtPathToSavedPhotosAlbum:[NSURL URLWithString:videoPath] completionBlock:^(NSURL *assetURL, NSError *error1) {
        UIAlertView *alert = [[UIAlertView alloc] initWithTitle: @"Video Saved!" message: @"Saved to the camera roll."
                                                       delegate:self
                                              cancelButtonTitle:nil
                                              otherButtonTitles:@"OK", nil];
        [alert show];
    }];
}

To specify an automatic end capture maximum duration, set the following property on the 'PBJVision' controller.

    [[PBJVision sharedInstance] setMaximumCaptureDuration:CMTimeMakeWithSeconds(5, 600)]; // ~ 5 seconds

To adjust the video quality and compression bit rate, modify the following properties on the PBJVision controller.

    @property (nonatomic, copy) NSString *captureSessionPreset;

    @property (nonatomic) CGFloat videoBitRate;
    @property (nonatomic) NSInteger audioBitRate;
    @property (nonatomic) NSDictionary *additionalCompressionProperties;

Community

• Need help? Use Stack Overflow with the tag 'pbjvision'.
• Questions? Use Stack Overflow with the tag 'pbjvision'.
• Found a bug? Open an issue.
• Feature idea? Open an issue.
• Want to contribute? Submit a pull request.

Resources

• AV Foundation Programming Guide
• PBJVideoPlayer, a simple iOS video player in Objective-C
• Player, a simple iOS video player in Swift

License

PBJVision is available under the MIT license, see the LICENSE file for more information.