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POScreen Recording in ipad
 

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    <p>I Am facing a problem from last two weeks. Actually I am working on an iPad app. In which I want to do annotation and also make screen recording of that annotations. Annotation part is working fine but it gives problem when I start recording. The problem is that it losts it's smoothness and gives lags during screen recording. For Screen Recording I am using AVAsset Writer. Codes are fine for both Annotation and Screen recording.... But I don't know where is the problem??</p> <p><strong>My ScreenShot Size is (1050,650)</strong> </p> <p>Should I use Grand Central Dispatch to solve this problem??? Can anybody help me to solve out my problem.....</p> <p>Plz plz help me....</p> <p><strong>MY CODE</strong></p> <pre><code>// For Annotation - (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event { mouseSwiped = NO; UITouch *touch = [touches anyObject]; if ([touch tapCount] == 2) { drawImage.image = nil; //Double click to undo drawing. return; } lastPoint = [touch locationInView:self.view]; lastPoint.y -= 20; } - (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event { mouseSwiped = YES; UITouch *touch = [touches anyObject]; CGPoint currentPoint = [touch locationInView:self.view]; currentPoint.y -= 20; // UIGraphicsBeginImageContext(canvasView.frame.size); UIGraphicsBeginImageContext(drawImage.frame.size); [drawImage.image drawInRect:CGRectMake(0, 0, drawImage.frame.size.width,drawImage.frame.size.height)]; CGContextSetLineCap(UIGraphicsGetCurrentContext(), kCGLineCapRound); CGContextSetLineWidth(UIGraphicsGetCurrentContext(), 10.0); CGContextSetRGBStrokeColor(UIGraphicsGetCurrentContext(), 1.0, 0.0, 0.0, 1.0); CGContextBeginPath(UIGraphicsGetCurrentContext()); CGContextMoveToPoint(UIGraphicsGetCurrentContext(), lastPoint.x, lastPoint.y); CGContextAddLineToPoint(UIGraphicsGetCurrentContext(), currentPoint.x, currentPoint.y); CGContextStrokePath(UIGraphicsGetCurrentContext()); drawImage.image = UIGraphicsGetImageFromCurrentImageContext(); UIGraphicsEndImageContext(); lastPoint = currentPoint; } - (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event { UITouch *touch = [touches anyObject]; if ([touch tapCount] == 2) { drawImage.image = nil; return; } if(!mouseSwiped) { UIGraphicsBeginImageContext(drawImage.frame.size); [drawImage.image drawInRect:CGRectMake(0, 0, drawImage.frame.size.width,drawImage.frame.size.height)]; CGContextSetLineCap(UIGraphicsGetCurrentContext(), kCGLineCapRound); CGContextSetLineWidth(UIGraphicsGetCurrentContext(), 5.0); CGContextSetRGBStrokeColor(UIGraphicsGetCurrentContext(), 1.0, 0.0, 0.0, 1.0); CGContextMoveToPoint(UIGraphicsGetCurrentContext(), lastPoint.x, lastPoint.y); CGContextAddLineToPoint(UIGraphicsGetCurrentContext(), lastPoint.x, lastPoint.y); CGContextStrokePath(UIGraphicsGetCurrentContext()); CGContextFlush(UIGraphicsGetCurrentContext()); drawImage.image = UIGraphicsGetImageFromCurrentImageContext(); UIGraphicsEndImageContext(); } } //For Screen Recording #define FRAME_WIDTH 1024 #define FRAME_HEIGHT 650 #define TIME_SCALE 600 - (UIImage*)screenshot { UIGraphicsBeginImageContext(drawImage.frame.size); [self.view.layer renderInContext:UIGraphicsGetCurrentContext()]; UIImage *viewImage = UIGraphicsGetImageFromCurrentImageContext(); UIGraphicsEndImageContext(); return viewImage; } -(NSURL*) pathToDocumentsDirectory { NSString* outputPath = [[NSString alloc] initWithFormat:@"%@/%@", [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) objectAtIndex:0], @"output.mov"]; outputURL = [[NSURL alloc] initFileURLWithPath:outputPath]; NSFileManager* fileManager = [NSFileManager defaultManager]; if ([fileManager fileExistsAtPath:outputPath]) { NSError* error; if ([fileManager removeItemAtPath:outputPath error:&amp;error] == NO) { NSLog(@"Could not delete old recording file at path: %@", outputPath); } } [outputPath release]; return [outputURL autorelease]; } -(void) writeSample: (NSTimer*) _timer { if (assetWriterInput.readyForMoreMediaData) { // CMSampleBufferRef sample = nil; CVReturn cvErr = kCVReturnSuccess; // get screenshot image! CGImageRef image = (CGImageRef) [[self screenshot] CGImage]; NSLog (@"made screenshot"); // prepare the pixel buffer CVPixelBufferRef pixelBuffer = NULL; CFDataRef imageData= CGDataProviderCopyData(CGImageGetDataProvider(image)); NSLog (@"copied image data"); cvErr = CVPixelBufferCreateWithBytes(kCFAllocatorDefault, FRAME_WIDTH, FRAME_HEIGHT, kCVPixelFormatType_32BGRA, (void*)CFDataGetBytePtr(imageData), CGImageGetBytesPerRow(image), NULL, NULL, NULL, &amp;pixelBuffer); NSLog (@"CVPixelBufferCreateWithBytes returned %d", cvErr); // calculate the time CFAbsoluteTime thisFrameWallClockTime = CFAbsoluteTimeGetCurrent(); CFTimeInterval elapsedTime = thisFrameWallClockTime - firstFrameWallClockTime; NSLog (@"elapsedTime: %f", elapsedTime); CMTime presentationTime = CMTimeMake (elapsedTime * TIME_SCALE, TIME_SCALE); // write the sample BOOL appended = [assetWriterPixelBufferAdaptor appendPixelBuffer:pixelBuffer withPresentationTime:presentationTime]; if (appended) { NSLog (@"appended sample at time %lf", CMTimeGetSeconds(presentationTime)); } else { NSLog (@"failed to append"); [self stopRecording]; } } } -(void) startRecording { movieURL = [self pathToDocumentsDirectory]; NSLog(@"path=%@",movieURL); movieError = nil; [assetWriter release]; assetWriter = [[AVAssetWriter alloc] initWithURL:movieURL fileType: AVFileTypeQuickTimeMovie error: &amp;movieError]; [self writer]; // start writing samples to it NSDate* start = [NSDate date]; frameRate=40.0f; float processingSeconds = [[NSDate date] timeIntervalSinceDate:start]; delayRemaining = (1.0 / self.frameRate) - processingSeconds; [assetWriterTimer release]; assetWriterTimer = [NSTimer scheduledTimerWithTimeInterval:delayRemaining &gt; 0.0 ? delayRemaining : 0.01 target:self selector:@selector (writeSample:) userInfo:nil repeats:YES] ; } -(void)writer { NSDictionary *assetWriterInputSettings = [NSDictionary dictionaryWithObjectsAndKeys: AVVideoCodecH264, AVVideoCodecKey, [NSNumber numberWithInt:FRAME_WIDTH], AVVideoWidthKey, [NSNumber numberWithInt:FRAME_HEIGHT], AVVideoHeightKey, nil]; assetWriterInput = [AVAssetWriterInput assetWriterInputWithMediaType: AVMediaTypeVideo outputSettings:assetWriterInputSettings]; assetWriterInput.expectsMediaDataInRealTime = YES; [assetWriter addInput:assetWriterInput]; [assetWriterPixelBufferAdaptor release]; assetWriterPixelBufferAdaptor = [[AVAssetWriterInputPixelBufferAdaptor alloc] initWithAssetWriterInput:assetWriterInput sourcePixelBufferAttributes:nil]; [assetWriter startWriting]; firstFrameWallClockTime = CFAbsoluteTimeGetCurrent(); [assetWriter startSessionAtSourceTime: CMTimeMake(0, TIME_SCALE)]; } -(void) stopRecording { [assetWriterTimer invalidate]; assetWriterTimer = nil; [assetWriter finishWriting]; NSLog (@"finished writing"); } </code></pre>
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