opencv/modules/highgui/src/cap_ios_video_camera.mm

/*
 *  cap_ios_video_camera.mm
 *  For iOS video I/O
 *  by Eduard Feicho on 29/07/12
 *  Copyright 2012. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * 1. Redistributions of source code must retain the above copyright notice,
 *    this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright notice,
 *    this list of conditions and the following disclaimer in the documentation
 *    and/or other materials provided with the distribution.
 * 3. The name of the author may not be used to endorse or promote products
 *    derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR "AS IS" AND ANY EXPRESS OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
 * EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 */

#import "opencv2/highgui/cap_ios.h"
#include "precomp.hpp"

#import <AssetsLibrary/AssetsLibrary.h>


static CGFloat DegreesToRadians(CGFloat degrees) {return degrees * M_PI / 180;};

#pragma mark - Private Interface




@interface CvVideoCamera ()

- (void)createVideoDataOutput;
- (void)createVideoFileOutput;


@property (nonatomic, retain) CALayer *customPreviewLayer;
@property (nonatomic, retain) AVCaptureVideoDataOutput *videoDataOutput;

@end



#pragma mark - Implementation



@implementation CvVideoCamera




@synthesize delegate;
@synthesize grayscaleMode;

@synthesize customPreviewLayer;
@synthesize videoDataOutput;

@synthesize recordVideo;
//@synthesize videoFileOutput;
@synthesize recordAssetWriterInput;
@synthesize recordPixelBufferAdaptor;
@synthesize recordAssetWriter;



#pragma mark - Constructors

- (id)initWithParentView:(UIView*)parent;
{
	self = [super initWithParentView:parent];
	if (self) {
		self.useAVCaptureVideoPreviewLayer = NO;
		self.recordVideo = NO;
	}
	return self;
}



#pragma mark - Public interface


- (void)start;
{
    [super start];
    
	if (self.recordVideo == YES) {		
        NSError* error;
        if ([[NSFileManager defaultManager] fileExistsAtPath:[self videoFileString]]) {
			[[NSFileManager defaultManager] removeItemAtPath:[self videoFileString] error:&error];
		}
        if (error == nil) {
            NSLog(@"[Camera] Delete file %@", [self videoFileString]);
        }
	}
}



- (void)stop;
{
	[super stop];
    
	self.videoDataOutput = nil;
	if (videoDataOutputQueue) {
		dispatch_release(videoDataOutputQueue);
	}
	
	if (self.recordVideo == YES) {
        
        if (self.recordAssetWriter.status == AVAssetWriterStatusWriting) {
            [self.recordAssetWriter finishWriting];
            NSLog(@"[Camera] recording stopped");
        } else {
            NSLog(@"[Camera] Recording Error: asset writer status is not writing");
        }
        
        self.recordAssetWriter = nil;
        self.recordAssetWriterInput = nil;
        self.recordPixelBufferAdaptor = nil;
	}
	
	[self.customPreviewLayer removeFromSuperlayer];
	self.customPreviewLayer = nil;
}

// TODO fix
- (void)adjustLayoutToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation;
{	
	
	NSLog(@"layout preview layer");
	if (self.parentView != nil) {
		
		CALayer* layer = self.customPreviewLayer;
		CGRect bounds = self.customPreviewLayer.bounds;
		int rotation_angle = 0;
		bool flip_bounds = false;
		
		switch (interfaceOrientation) {
            case UIInterfaceOrientationPortrait:
				NSLog(@"to Portrait");
                rotation_angle = 270;
                break;
            case UIInterfaceOrientationPortraitUpsideDown:
                rotation_angle = 90;
				NSLog(@"to UpsideDown");
				break;
            case UIInterfaceOrientationLandscapeLeft:
                rotation_angle = 0;
				NSLog(@"to LandscapeLeft");
				break;
            case UIInterfaceOrientationLandscapeRight:
                rotation_angle = 180;
				NSLog(@"to LandscapeRight");
				break;
            default:
                break; // leave the layer in its last known orientation
        }
		
		switch (defaultAVCaptureVideoOrientation) {
			case AVCaptureVideoOrientationLandscapeRight:
				rotation_angle += 180;
				break;
			case AVCaptureVideoOrientationPortraitUpsideDown:
				rotation_angle += 270;
				break;
			case AVCaptureVideoOrientationPortrait:
				rotation_angle += 90;
			case AVCaptureVideoOrientationLandscapeLeft:
				break;
			default:
				break;
		}
		rotation_angle = rotation_angle % 360;
		
		if (rotation_angle == 90 || rotation_angle == 270) {
			flip_bounds = true;
		}
		
		if (flip_bounds) {
			NSLog(@"flip bounds");
			bounds = CGRectMake(0, 0, bounds.size.height, bounds.size.width);
		}
		
		layer.position = CGPointMake(self.parentView.frame.size.width/2., self.parentView.frame.size.height/2.);
		self.customPreviewLayer.bounds = CGRectMake(0, 0, self.parentView.frame.size.width, self.parentView.frame.size.height);
		
		layer.affineTransform = CGAffineTransformMakeRotation( DegreesToRadians(rotation_angle) );
		layer.bounds = bounds;
	}

}

// TODO fix
- (void)layoutPreviewLayer;
{
	NSLog(@"layout preview layer");
	if (self.parentView != nil) {
		
		CALayer* layer = self.customPreviewLayer;
		CGRect bounds = self.customPreviewLayer.bounds;
		int rotation_angle = 0;
		bool flip_bounds = false;
		
		switch (currentDeviceOrientation) {
            case UIDeviceOrientationPortrait:
                rotation_angle = 270;
                break;
            case UIDeviceOrientationPortraitUpsideDown:
                rotation_angle = 90;
				break;
            case UIDeviceOrientationLandscapeLeft:
				NSLog(@"left");
                rotation_angle = 180;
				break;
            case UIDeviceOrientationLandscapeRight:
				NSLog(@"right");
                rotation_angle = 0;
				break;
            case UIDeviceOrientationFaceUp:
            case UIDeviceOrientationFaceDown:
            default:
                break; // leave the layer in its last known orientation
        }
		
		switch (defaultAVCaptureVideoOrientation) {
			case AVCaptureVideoOrientationLandscapeRight:
				rotation_angle += 180;
				break;
			case AVCaptureVideoOrientationPortraitUpsideDown:
				rotation_angle += 270;
				break;
			case AVCaptureVideoOrientationPortrait:
				rotation_angle += 90;
			case AVCaptureVideoOrientationLandscapeLeft:
				break;
			default:
				break;
		}
		rotation_angle = rotation_angle % 360;
		
		if (rotation_angle == 90 || rotation_angle == 270) {
			flip_bounds = true;
		}
		
		if (flip_bounds) {
			NSLog(@"flip bounds");
			bounds = CGRectMake(0, 0, bounds.size.height, bounds.size.width);
		}
		
		layer.position = CGPointMake(self.parentView.frame.size.width/2., self.parentView.frame.size.height/2.);
		layer.affineTransform = CGAffineTransformMakeRotation( DegreesToRadians(rotation_angle) );
		layer.bounds = bounds;
	}
	
}




#pragma mark - Private Interface



- (void)createVideoDataOutput;
{
	// Make a video data output
	self.videoDataOutput = [AVCaptureVideoDataOutput new];
	
	// In grayscale mode we want YUV (YpCbCr 4:2:0) so we can directly access the graylevel intensity values (Y component)
	// In color mode we, BGRA format is used
	OSType format = self.grayscaleMode ? kCVPixelFormatType_420YpCbCr8BiPlanarFullRange : kCVPixelFormatType_32BGRA;
	
	self.videoDataOutput.videoSettings  = [NSDictionary dictionaryWithObject:[NSNumber numberWithUnsignedInt:format]
                                                                      forKey:(id)kCVPixelBufferPixelFormatTypeKey];
	
	// discard if the data output queue is blocked (as we process the still image)
	[self.videoDataOutput setAlwaysDiscardsLateVideoFrames:YES];
	
	if ( [self.captureSession canAddOutput:self.videoDataOutput] ) {
		[self.captureSession addOutput:self.videoDataOutput];
	}
	[[self.videoDataOutput connectionWithMediaType:AVMediaTypeVideo] setEnabled:YES];
		
	
	// set default FPS
	if ([self.videoDataOutput connectionWithMediaType:AVMediaTypeVideo].supportsVideoMinFrameDuration) {
		[self.videoDataOutput connectionWithMediaType:AVMediaTypeVideo].videoMinFrameDuration = CMTimeMake(1, self.defaultFPS);
	}
	if ([self.videoDataOutput connectionWithMediaType:AVMediaTypeVideo].supportsVideoMaxFrameDuration) {
		[self.videoDataOutput connectionWithMediaType:AVMediaTypeVideo].videoMaxFrameDuration = CMTimeMake(1, self.defaultFPS);
	}
	
	// set video mirroring for front camera (more intuitive)
	if ([self.videoDataOutput connectionWithMediaType:AVMediaTypeVideo].supportsVideoMirroring) {
		if (self.defaultAVCaptureDevicePosition == AVCaptureDevicePositionFront) {
			[self.videoDataOutput connectionWithMediaType:AVMediaTypeVideo].videoMirrored = YES;
		} else {
			[self.videoDataOutput connectionWithMediaType:AVMediaTypeVideo].videoMirrored = NO;
		}
	}
	
	// set default video orientation
	if ([self.videoDataOutput connectionWithMediaType:AVMediaTypeVideo].supportsVideoOrientation) {
		[self.videoDataOutput connectionWithMediaType:AVMediaTypeVideo].videoOrientation = self.defaultAVCaptureVideoOrientation;
	}
	
	
	// create a custom preview layer
	self.customPreviewLayer = [CALayer layer];
	self.customPreviewLayer.bounds = CGRectMake(0, 0, self.parentView.frame.size.width, self.parentView.frame.size.height);
	[self layoutPreviewLayer];
	
	// create a serial dispatch queue used for the sample buffer delegate as well as when a still image is captured
	// a serial dispatch queue must be used to guarantee that video frames will be delivered in order
	// see the header doc for setSampleBufferDelegate:queue: for more information
	videoDataOutputQueue = dispatch_queue_create("VideoDataOutputQueue", DISPATCH_QUEUE_SERIAL);
	[self.videoDataOutput setSampleBufferDelegate:self queue:videoDataOutputQueue];
	
	
	NSLog(@"[Camera] created AVCaptureVideoDataOutput at %d FPS", self.defaultFPS);
}



- (void)createVideoFileOutput;
{
	/* Video File Output in H.264, via AVAsserWriter */
    NSLog(@"Create Video with dimensions %dx%d", self.imageWidth, self.imageHeight);
    
	NSDictionary *outputSettings
	 = [NSDictionary dictionaryWithObjectsAndKeys:[NSNumber numberWithInt:self.imageWidth], AVVideoWidthKey,
	 											  [NSNumber numberWithInt:self.imageHeight], AVVideoHeightKey,
	 											  AVVideoCodecH264, AVVideoCodecKey,
			 									  nil
	 ];
    
	
	self.recordAssetWriterInput = [AVAssetWriterInput assetWriterInputWithMediaType:AVMediaTypeVideo outputSettings:outputSettings];
	
	
	int pixelBufferFormat = (self.grayscaleMode == YES) ? kCVPixelFormatType_420YpCbCr8BiPlanarFullRange : kCVPixelFormatType_32BGRA;
	
	self.recordPixelBufferAdaptor =
	           [[AVAssetWriterInputPixelBufferAdaptor alloc] 
	                initWithAssetWriterInput:self.recordAssetWriterInput 
	                sourcePixelBufferAttributes:[NSDictionary dictionaryWithObjectsAndKeys:[NSNumber numberWithInt:pixelBufferFormat], kCVPixelBufferPixelFormatTypeKey, nil]];
	
	NSError* error = nil;
    NSLog(@"Create AVAssetWriter with url: %@", [self videoFileURL]);
	self.recordAssetWriter = [AVAssetWriter assetWriterWithURL:[self videoFileURL]
                                                      fileType:AVFileTypeMPEG4
                                                         error:&error];
	if (error != nil) {
		NSLog(@"[Camera] Unable to create AVAssetWriter: %@", error);
	}
	
	[self.recordAssetWriter addInput:self.recordAssetWriterInput];
	self.recordAssetWriterInput.expectsMediaDataInRealTime = YES;
    
    NSLog(@"[Camera] created AVAssetWriter");
}


- (void)createCaptureOutput;
{
	[self createVideoDataOutput];
	if (self.recordVideo == YES) {
		[self createVideoFileOutput];
	}
}

- (void)createCustomVideoPreview;
{
	[self.parentView.layer addSublayer:self.customPreviewLayer];
}


#pragma mark - Protocol AVCaptureVideoDataOutputSampleBufferDelegate


- (void)captureOutput:(AVCaptureOutput *)captureOutput didOutputSampleBuffer:(CMSampleBufferRef)sampleBuffer fromConnection:(AVCaptureConnection *)connection
{
	if (self.delegate) {
		
		// convert from Core Media to Core Video
		CVImageBufferRef imageBuffer = CMSampleBufferGetImageBuffer(sampleBuffer);
		CVPixelBufferLockBaseAddress(imageBuffer, 0);
		
		void* bufferAddress;
		size_t width;
		size_t height;
		size_t bytesPerRow;
		
		CGColorSpaceRef colorSpace;
		CGContextRef context;
		
		int format_opencv;
		
		OSType format = CVPixelBufferGetPixelFormatType(imageBuffer);
		if (format == kCVPixelFormatType_420YpCbCr8BiPlanarFullRange) {
			
			format_opencv = CV_8UC1;
			
			bufferAddress = CVPixelBufferGetBaseAddressOfPlane(imageBuffer, 0);
			width = CVPixelBufferGetWidthOfPlane(imageBuffer, 0);
			height = CVPixelBufferGetHeightOfPlane(imageBuffer, 0);
			bytesPerRow = CVPixelBufferGetBytesPerRowOfPlane(imageBuffer, 0);
			
		} else { // expect kCVPixelFormatType_32BGRA
			
			format_opencv = CV_8UC4;
			
			bufferAddress = CVPixelBufferGetBaseAddress(imageBuffer);
			width = CVPixelBufferGetWidth(imageBuffer);
			height = CVPixelBufferGetHeight(imageBuffer);
			bytesPerRow = CVPixelBufferGetBytesPerRow(imageBuffer);
			
		}
		
		// delegate image processing to the delegate
		cv::Mat image(height, width, format_opencv, bufferAddress, bytesPerRow);
		
		cv::Mat* result = NULL;
		CGImage* dstImage;
		
		if ([self.delegate respondsToSelector:@selector(processImage:)]) {
			[self.delegate processImage:image];
		}
		
		// check if matrix data pointer or dimensions were changed by the delegate
		bool iOSimage = false;
		if (height == image.rows && width == image.cols && format_opencv == image.type() && bufferAddress == image.data && bytesPerRow == image.step) {
			iOSimage = true;
		}
		
		
		// (create color space, create graphics context, render buffer)
		CGBitmapInfo bitmapInfo;
		
		// basically we decide if it's a grayscale, rgb or rgba image
		if (image.channels() == 1) {
			colorSpace = CGColorSpaceCreateDeviceGray();
			bitmapInfo = kCGImageAlphaNone;
		} else if (image.channels() == 3) {
			colorSpace = CGColorSpaceCreateDeviceRGB();
			bitmapInfo = kCGImageAlphaNone;
			if (iOSimage) {
				bitmapInfo |= kCGBitmapByteOrder32Little;
			} else {
				bitmapInfo |= kCGBitmapByteOrder32Big;
			}
		} else {
			colorSpace = CGColorSpaceCreateDeviceRGB();
			bitmapInfo = kCGImageAlphaPremultipliedFirst;
			if (iOSimage) {
				bitmapInfo |= kCGBitmapByteOrder32Little;
			} else {
				bitmapInfo |= kCGBitmapByteOrder32Big;
			}
		}
		
		if (iOSimage) {
			context = CGBitmapContextCreate(bufferAddress, width, height, 8, bytesPerRow, colorSpace, bitmapInfo);
			dstImage = CGBitmapContextCreateImage(context);
			CGContextRelease(context);
		} else {
			
			NSData *data = [NSData dataWithBytes:image.data length:image.elemSize()*image.total()];
			CGDataProviderRef provider = CGDataProviderCreateWithCFData((__bridge CFDataRef)data);
			
			// Creating CGImage from cv::Mat
			dstImage = CGImageCreate(image.cols,                                 // width
									 image.rows,                                 // height
									 8,                                          // bits per component
									 8 * image.elemSize(),                       // bits per pixel
									 image.step,                                 // bytesPerRow
									 colorSpace,                                 // colorspace
									 bitmapInfo,                                 // bitmap info
									 provider,                                   // CGDataProviderRef
									 NULL,                                       // decode
									 false,                                      // should interpolate
									 kCGRenderingIntentDefault                   // intent
									 );
			
			CGDataProviderRelease(provider);
		}
		
		
		// render buffer
		dispatch_sync(dispatch_get_main_queue(), ^{
			self.customPreviewLayer.contents = (__bridge id)dstImage;
		});
		
		
		if (self.recordVideo == YES) {
			lastSampleTime = CMSampleBufferGetPresentationTimeStamp(sampleBuffer);
//			CMTimeShow(lastSampleTime);
			if (self.recordAssetWriter.status != AVAssetWriterStatusWriting) {
				[self.recordAssetWriter startWriting];
				[self.recordAssetWriter startSessionAtSourceTime:lastSampleTime];
				if (self.recordAssetWriter.status != AVAssetWriterStatusWriting) {
					NSLog(@"[Camera] Recording Error: asset writer status is not writing: %@", self.recordAssetWriter.error);
					return;
				} else {
					NSLog(@"[Camera] Video recording started");
				}
			}
			
			if (self.recordAssetWriterInput.readyForMoreMediaData) {
				if (! [self.recordPixelBufferAdaptor appendPixelBuffer:imageBuffer
											  	  withPresentationTime:lastSampleTime] ) {
					NSLog(@"Video Writing Error");
				}
			}
		
		}
		
		
		// cleanup
		CGImageRelease(dstImage);
		
		CGColorSpaceRelease(colorSpace);
		
		CVPixelBufferUnlockBaseAddress(imageBuffer, 0);
	}
}


- (void)updateOrientation;
{
	NSLog(@"rotate..");
	self.customPreviewLayer.bounds = CGRectMake(0, 0, self.parentView.frame.size.width, self.parentView.frame.size.height);
	[self layoutPreviewLayer];
}


- (void)saveVideo;
{
    if (self.recordVideo == NO) {
        return;
    }
    
	ALAssetsLibrary *library = [[ALAssetsLibrary alloc] init];
    if ([library videoAtPathIsCompatibleWithSavedPhotosAlbum:[self videoFileURL]]) {
        [library writeVideoAtPathToSavedPhotosAlbum:[self videoFileURL]
                                    completionBlock:^(NSURL *assetURL, NSError *error){}];
    }
}


- (NSURL *)videoFileURL;
{
    NSString *outputPath = [[NSString alloc] initWithFormat:@"%@%@", NSTemporaryDirectory(), @"output.mov"];
    NSURL *outputURL = [NSURL fileURLWithPath:outputPath];
    NSFileManager *fileManager = [NSFileManager defaultManager];
    if ([fileManager fileExistsAtPath:outputPath]) {
        NSLog(@"file exists");
    }
    return outputURL;
}



- (NSString *)videoFileString;
{
    NSString *outputPath = [[NSString alloc] initWithFormat:@"%@%@", NSTemporaryDirectory(), @"output.mov"];
    return outputPath;
}

@end