ios使用AVCaptureVideoDataOutput实现连续拍照消除快门声音

最近碰到需求，要拍照时候没有声音，用AVCaptureStillImageOutput拍照会有快门声，查了网上的使用了反向声音的方式，但是因为要连拍会导致有些时候声音不同步，还是会有漏网的快门声，最后研究了一下使用了AVCaptureVideoDataOutput来对图像进行输出，没有了快门声音，代码如下：

//初始化
- (void)initAVCaptureSession{AVCaptureSession *session = [[AVCaptureSession alloc] init];NSError *error;AVCaptureDevice *device = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo];//更改这个设置的时候必须先锁定设备，修改完后再解锁，否则崩溃[device lockForConfiguration:nil];//设置闪光灯为自动if ([device isFlashModeSupported:AVCaptureFlashModeOff]) {[device setFlashMode:AVCaptureFlashModeOff];};[device unlockForConfiguration];self.videoInput = [[AVCaptureDeviceInput alloc] initWithDevice:device error:&error];if (error) {NSLog(@"%@",error);}// Create a VideoDataOutput and add it to the sessionself.imageOutput = [[AVCaptureVideoDataOutput alloc] init];[self.session addOutput:self.imageOutput];// Configure your output.dispatch_queue_t queue = dispatch_queue_create("myQueue", NULL);[self.imageOutput setSampleBufferDelegate:self queue:queue];// Specify the pixel formatself.imageOutput.videoSettings = [NSDictionary dictionaryWithObject:[NSNumber numberWithInt:kCVPixelFormatType_32BGRA]forKey:(id)kCVPixelBufferPixelFormatTypeKey];// Start the session running to start the flow of data[session startRunning];// Assign session to an ivar.[self setSession:session];if ([self.session canAddInput:self.videoInput]) {[self.session addInput:self.videoInput];}if ([self.session canAddOutput:self.imageOutput]) {[self.session addOutput:self.imageOutput];}AVCaptureDevicePosition desiredPosition = AVCaptureDevicePositionFront;for (AVCaptureDevice *d in [AVCaptureDevice devicesWithMediaType:AVMediaTypeVideo]) {if ([d position] == desiredPosition) {[self.previewLayer.session beginConfiguration];AVCaptureDeviceInput *input = [AVCaptureDeviceInput deviceInputWithDevice:d error:nil];for (AVCaptureInput *oldInput in self.previewLayer.session.inputs) {[[self.previewLayer session] removeInput:oldInput];}[self.previewLayer.session addInput:input];[self.previewLayer.session commitConfiguration];break;}}}

//避免前置摄像头反转
- (AVCaptureVideoOrientation)avOrientationForDeviceOrientation:(UIDeviceOrientation)deviceOrientation
{AVCaptureVideoOrientation result = (AVCaptureVideoOrientation)deviceOrientation;if ( deviceOrientation == UIDeviceOrientationLandscapeLeft )result = AVCaptureVideoOrientationLandscapeRight;else if ( deviceOrientation == UIDeviceOrientationLandscapeRight )result = AVCaptureVideoOrientationLandscapeLeft;return result;
}

//使用前置摄像头
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
{return (interfaceOrientation == UIInterfaceOrientationPortrait);
}

//照片获取，以及其他处理
- (void)captureOutput:(AVCaptureOutput *)captureOutput
didOutputSampleBuffer:(CMSampleBufferRef)sampleBufferfromConnection:(AVCaptureConnection *)connection
{if(sampleBuffer == NULL){return ;}// Create a UIImage from the sample buffer dataUIImage *oldImage = [self imageFromSampleBuffer:sampleBuffer];NSData *newData = UIImageJPEGRepresentation(oldImage, 0.3);[dataArray addObject:newData];NSString *imageName = [NSString stringWithFormat:@"%@.jpg",[self getCurrentTimeInterval]];        //保存图片本地NSString *savedImagePath = [LOCATION_IMAGES_PATH stringByAppendingPathComponent:imageName];//        NSLog(@"%@",savedImagePath);[newData writeToFile:savedImagePath atomically:NO];
}

// Create a UIImage from sample buffer data
- (UIImage *) imageFromSampleBuffer:(CMSampleBufferRef) sampleBuffer
{// Get a CMSampleBuffer's Core Video image buffer for the media dataCVImageBufferRef imageBuffer = CMSampleBufferGetImageBuffer(sampleBuffer);// Lock the base address of the pixel bufferCVPixelBufferLockBaseAddress(imageBuffer, 0);// Get the number of bytes per row for the pixel buffervoid *baseAddress = CVPixelBufferGetBaseAddress(imageBuffer);// Get the number of bytes per row for the pixel buffersize_t bytesPerRow = CVPixelBufferGetBytesPerRow(imageBuffer);// Get the pixel buffer width and heightsize_t width = CVPixelBufferGetWidth(imageBuffer);size_t height = CVPixelBufferGetHeight(imageBuffer);// Create a device-dependent RGB color spaceCGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB();// Create a bitmap graphics context with the sample buffer dataCGContextRef context = CGBitmapContextCreate(baseAddress, width, height, 8,bytesPerRow, colorSpace, kCGBitmapByteOrder32Little | kCGImageAlphaPremultipliedFirst);// Create a Quartz image from the pixel data in the bitmap graphics contextCGImageRef quartzImage = CGBitmapContextCreateImage(context);// Unlock the pixel bufferCVPixelBufferUnlockBaseAddress(imageBuffer,0);// Free up the context and color spaceCGContextRelease(context);CGColorSpaceRelease(colorSpace);// Create an image object from the Quartz imageUIImage *image = [UIImage imageWithCGImage:quartzImage];// Release the Quartz imageCGImageRelease(quartzImage);return (image);
}

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ios使用AVCaptureVideoDataOutput实现连续拍照消除快门声音

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