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//------------------------------------------------------------------------
// 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 <CoreGraphics/CoreGraphics.h>
#import "ZBarImageScanner.h"
@class AVCaptureVideoDataOutput, AVCaptureOutput;
@class ZBarCaptureReader, ZBarCVImage;
@protocol ZBarCaptureDelegate <NSObject>
// called when a new barcode is detected. the image refers to the
// video buffer and must not be retained for long
- (void)captureReader:(ZBarCaptureReader *)captureReader
didReadNewSymbolsFromImage:(ZBarImage *)image;
@optional
// called when a potential/uncertain barcode is detected. will also
// be called *after* captureReader:didReadNewSymbolsFromImage:
// when good barcodes are detected
- (void)captureReader:(ZBarCaptureReader *)captureReader
didTrackSymbols:(ZBarSymbolSet *)symbols;
@end
@interface ZBarCaptureReader : NSObject {
#if !TARGET_IPHONE_SIMULATOR
AVCaptureVideoDataOutput *captureOutput;
id<ZBarCaptureDelegate> captureDelegate;
ZBarImageScanner *scanner;
CGRect scanCrop;
CGSize size;
CGFloat framesPerSecond;
BOOL enableCache;
dispatch_queue_t queue;
ZBarImage *image;
ZBarCVImage *result;
volatile uint32_t state;
int framecnt;
unsigned width, height;
uint64_t t_frame, t_fps, t_scan;
CGFloat dt_frame;
#endif
}
// supply a pre-configured image scanner
- (id)initWithImageScanner:(ZBarImageScanner *)imageScanner;
// this must be called before the session is started
- (void)willStartRunning;
// this must be called *before* the session is stopped
- (void)willStopRunning;
// clear the internal result cache
- (void)flushCache;
// capture the next frame after processing. the captured image will
// follow the same delegate path as an image with decoded symbols.
- (void)captureFrame;
// the capture output. add this to an instance of AVCaptureSession
@property (nonatomic, readonly) AVCaptureOutput *captureOutput;
// delegate is notified of decode results and symbol tracking.
@property (nonatomic, assign) id<ZBarCaptureDelegate> captureDelegate;
// access to image scanner for configuration.
@property (nonatomic, readonly) ZBarImageScanner *scanner;
// region of image to scan in normalized coordinates.
// NB horizontal crop currently ignored...
@property (nonatomic, assign) CGRect scanCrop;
// size of video frames.
@property (nonatomic, readonly) CGSize size;
// (quickly) gate the reader function without interrupting the video
// stream. also flushes the cache when enabled. defaults to *NO*
@property (nonatomic) BOOL enableReader;
// current frame rate (for debug/optimization).
// only valid when running
@property (nonatomic, readonly) CGFloat framesPerSecond;
@property (nonatomic) BOOL enableCache;
@end
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