diff options
Diffstat (limited to 'iphone/ZBarReaderViewImpl_Capture.m')
| -rw-r--r-- | iphone/ZBarReaderViewImpl_Capture.m | 402 |
1 files changed, 402 insertions, 0 deletions
diff --git a/iphone/ZBarReaderViewImpl_Capture.m b/iphone/ZBarReaderViewImpl_Capture.m new file mode 100644 index 0000000..dd5a696 --- /dev/null +++ b/iphone/ZBarReaderViewImpl_Capture.m @@ -0,0 +1,402 @@ +//------------------------------------------------------------------------ +// Copyright 2010 (c) Jeff Brown <spadix@users.sourceforge.net> +// +// This file is part of the ZBar Bar Code Reader. +// +// The ZBar Bar Code Reader is free software; you can redistribute it +// and/or modify it under the terms of the GNU Lesser Public License as +// published by the Free Software Foundation; either version 2.1 of +// the License, or (at your option) any later version. +// +// The ZBar Bar Code Reader is distributed in the hope that it will be +// useful, but WITHOUT ANY WARRANTY; without even the implied warranty +// of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the +// GNU Lesser Public License for more details. +// +// You should have received a copy of the GNU Lesser Public License +// along with the ZBar Bar Code Reader; if not, write to the Free +// Software Foundation, Inc., 51 Franklin St, Fifth Floor, +// Boston, MA 02110-1301 USA +// +// http://sourceforge.net/projects/zbar +//------------------------------------------------------------------------ + +#import <AVFoundation/AVFoundation.h> +#import <CoreMedia/CoreMedia.h> +#import <CoreVideo/CoreVideo.h> +#import <ZBarSDK/ZBarReaderView.h> +#import <ZBarSDK/ZBarCaptureReader.h> + +#define MODULE ZBarReaderView +#import "debug.h" + +// protected APIs +@interface ZBarReaderView() +- (void) _initWithImageScanner: (ZBarImageScanner*) _scanner; +- (void) initSubviews; +- (void) updateCrop; +- (void) setImageSize: (CGSize) size; +- (void) didTrackSymbols: (ZBarSymbolSet*) syms; +@end + +@interface ZBarReaderViewImpl + : ZBarReaderView +{ + AVCaptureSession *session; + AVCaptureDevice *device; + AVCaptureInput *input; +} + +@end + +@implementation ZBarReaderViewImpl + +@synthesize device, session; + +- (void) _initWithImageScanner: (ZBarImageScanner*) scanner +{ + [super _initWithImageScanner: scanner]; + + session = [AVCaptureSession new]; + NSNotificationCenter *notify = + [NSNotificationCenter defaultCenter]; + [notify addObserver: self + selector: @selector(onVideoError:) + name: AVCaptureSessionRuntimeErrorNotification + object: session]; + [notify addObserver: self + selector: @selector(onVideoStart:) + name: AVCaptureSessionDidStartRunningNotification + object: session]; + [notify addObserver: self + selector: @selector(onVideoStop:) + name: AVCaptureSessionDidStopRunningNotification + object: session]; + [notify addObserver: self + selector: @selector(onVideoStop:) + name: AVCaptureSessionWasInterruptedNotification + object: session]; + [notify addObserver: self + selector: @selector(onVideoStart:) + name: AVCaptureSessionInterruptionEndedNotification + object: session]; + + self.device = [AVCaptureDevice + defaultDeviceWithMediaType: AVMediaTypeVideo]; + + captureReader = [[ZBarCaptureReader alloc] + initWithImageScanner: scanner]; + captureReader.captureDelegate = (id<ZBarCaptureDelegate>)self; + [session addOutput: captureReader.captureOutput]; + + if([session canSetSessionPreset: AVCaptureSessionPreset640x480]) + session.sessionPreset = AVCaptureSessionPreset640x480; + + [captureReader addObserver: self + forKeyPath: @"size" + options: 0 + context: NULL]; + + [self initSubviews]; +} + +- (void) initSubviews +{ + AVCaptureVideoPreviewLayer *videoPreview = + [[AVCaptureVideoPreviewLayer + layerWithSession: session] + retain]; + preview = videoPreview; + CGRect bounds = self.bounds; + bounds.origin = CGPointZero; + preview.bounds = bounds; + preview.position = CGPointMake(bounds.size.width / 2, + bounds.size.height / 2); + videoPreview.videoGravity = AVLayerVideoGravityResizeAspectFill; + [self.layer addSublayer: preview]; + + [super initSubviews]; +} + +- (void) dealloc +{ + [[NSNotificationCenter defaultCenter] + removeObserver: self]; + if(showsFPS) { + @try { + [captureReader removeObserver: self + forKeyPath: @"framesPerSecond"]; + } + @catch(...) { } + } + @try { + [captureReader removeObserver: self + forKeyPath: @"size"]; + } + @catch(...) { } + captureReader.captureDelegate = nil; + [captureReader release]; + captureReader = nil; + [device release]; + device = nil; + [input release]; + input = nil; + [session release]; + session = nil; + [super dealloc]; +} + +- (void) updateCrop +{ + [super updateCrop]; + captureReader.scanCrop = effectiveCrop; +} + +- (ZBarImageScanner*) scanner +{ + return(captureReader.scanner); +} + +- (void) setDevice: (AVCaptureDevice*) newdev +{ + id olddev = device; + AVCaptureInput *oldinput = input; + assert(!olddev == !oldinput); + + NSError *error = nil; + device = [newdev retain]; + if(device) { + assert([device hasMediaType: AVMediaTypeVideo]); + input = [[AVCaptureDeviceInput alloc] + initWithDevice: newdev + error: &error]; + assert(input); + } + else + input = nil; + + [session beginConfiguration]; + if(oldinput) + [session removeInput: oldinput]; + if(input) + [session addInput: input]; + [session commitConfiguration]; + + [olddev release]; + [oldinput release]; +} + +- (BOOL) enableCache +{ + return(captureReader.enableCache); +} + +- (void) setEnableCache: (BOOL) enable +{ + captureReader.enableCache = enable; +} + +- (void) setTorchMode: (NSInteger) mode +{ + [super setTorchMode: mode]; + if(running && [device isTorchModeSupported: mode]) + @try { + device.torchMode = mode; + } + @catch(...) { } +} + +- (void) setShowsFPS: (BOOL) show +{ + [super setShowsFPS: show]; + @try { + if(show) + [captureReader addObserver: self + forKeyPath: @"framesPerSecond" + options: 0 + context: NULL]; + else + [captureReader removeObserver: self + forKeyPath: @"framesPerSecond"]; + } + @catch(...) { } +} + +- (void) start +{ + if(started) + return; + [super start]; + + [session startRunning]; + captureReader.enableReader = YES; +} + +- (void) stop +{ + if(!started) + return; + [super stop]; + + captureReader.enableReader = NO; + [session stopRunning]; +} + +- (void) flushCache +{ + [captureReader flushCache]; +} + +- (void) configureDevice +{ + if([device isFocusModeSupported: AVCaptureFocusModeContinuousAutoFocus]) + device.focusMode = AVCaptureFocusModeContinuousAutoFocus; + if([device isTorchModeSupported: torchMode]) + device.torchMode = torchMode; +} + +- (void) lockDevice +{ + if(!running || locked) { + assert(0); + return; + } + + // lock device and set focus mode + NSError *error = nil; + if([device lockForConfiguration: &error]) { + locked = YES; + [self configureDevice]; + } + else { + zlog(@"failed to lock device: %@", error); + // just keep trying + [self performSelector: @selector(lockDevice) + withObject: nil + afterDelay: .5]; + } +} + + +// AVCaptureSession notifications + +- (void) onVideoStart: (NSNotification*) note +{ + zlog(@"onVideoStart: running=%d %@", running, note); + if(running) + return; + running = YES; + locked = NO; + + [self lockDevice]; + + if([readerDelegate respondsToSelector: @selector(readerViewDidStart:)]) + [readerDelegate readerViewDidStart: self]; +} + +- (void) onVideoStop: (NSNotification*) note +{ + zlog(@"onVideoStop: %@", note); + if(!running) + return; + running = NO; + + if(locked) + [device unlockForConfiguration]; + else + [NSObject cancelPreviousPerformRequestsWithTarget: self + selector: @selector(lockDevice) + object: nil]; + locked = NO; + + if([readerDelegate respondsToSelector: + @selector(readerView:didStopWithError:)]) + [readerDelegate readerView: self + didStopWithError: nil]; +} + +- (void) onVideoError: (NSNotification*) note +{ + zlog(@"onVideoError: %@", note); + if(running) { + // FIXME does session always stop on error? + running = started = NO; + [device unlockForConfiguration]; + } + NSError *err = + [note.userInfo objectForKey: AVCaptureSessionErrorKey]; + + if([readerDelegate respondsToSelector: + @selector(readerView:didStopWithError:)]) + [readerDelegate readerView: self + didStopWithError: err]; + else + NSLog(@"ZBarReaderView: ERROR during capture: %@: %@", + [err localizedDescription], + [err localizedFailureReason]); +} + +// NSKeyValueObserving + +- (void) observeValueForKeyPath: (NSString*) path + ofObject: (id) obj + change: (NSDictionary*) info + context: (void*) ctx +{ + if(obj == captureReader && + [path isEqualToString: @"size"]) + // adjust preview to match image size + [self setImageSize: captureReader.size]; + else if(obj == captureReader && + [path isEqualToString: @"framesPerSecond"]) + fpsLabel.text = [NSString stringWithFormat: @"%.2ffps ", + captureReader.framesPerSecond]; +} + +// ZBarCaptureDelegate + +- (void) captureReader: (ZBarCaptureReader*) reader + didTrackSymbols: (ZBarSymbolSet*) syms +{ + [self didTrackSymbols: syms]; +} + +- (void) captureReader: (ZBarCaptureReader*) reader + didReadNewSymbolsFromImage: (ZBarImage*) zimg +{ + zlog(@"scanned %d symbols: %@", zimg.symbols.count, zimg); + if(!readerDelegate) + return; + + UIImageOrientation orient = [UIDevice currentDevice].orientation; + if(!UIDeviceOrientationIsValidInterfaceOrientation(orient)) { + orient = interfaceOrientation; + if(orient == UIInterfaceOrientationLandscapeLeft) + orient = UIDeviceOrientationLandscapeLeft; + else if(orient == UIInterfaceOrientationLandscapeRight) + orient = UIDeviceOrientationLandscapeRight; + } + switch(orient) + { + case UIDeviceOrientationPortraitUpsideDown: + orient = UIImageOrientationLeft; + break; + case UIDeviceOrientationLandscapeLeft: + orient = UIImageOrientationUp; + break; + case UIDeviceOrientationLandscapeRight: + orient = UIImageOrientationDown; + break; + default: + orient = UIImageOrientationRight; + break; + } + + UIImage *uiimg = [zimg UIImageWithOrientation: orient]; + [readerDelegate + readerView: self + didReadSymbols: zimg.symbols + fromImage: uiimg]; +} + +@end |