我正在利用 AVFoundation 将自定义相机集成到我的应用程序中...问题是,由于内存压力,我遇到了罕见但仍在发生的崩溃,我不确定为什么,因为我使用 ARC,崩溃时 Xcode 中的内存只有 20mb 左右?这是怎么回事?
这是我的代码
- (void)setupCamera
{
self.session = [[AVCaptureSession alloc] init];
[self.session setSessionPreset:AVCaptureSessionPresetPhoto];
AVCaptureDevice *device = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo];
AVCaptureDeviceInput *input = [AVCaptureDeviceInput deviceInputWithDevice:device error:nil];
if ([self.session canAddInput:input]) {
[self.session addInput:input];
}
AVCaptureVideoDataOutput *output = [[AVCaptureVideoDataOutput alloc] init];
if ([self.session canAddOutput:output]) {
output.videoSettings = [NSDictionary dictionaryWithObject:[NSNumber numberWithInt:kCVPixelFormatType_32BGRA] forKey:(id)kCVPixelBufferPixelFormatTypeKey];
[self.session addOutput:output];
[output setSampleBufferDelegate:self queue:dispatch_get_main_queue()];
}
self.preview = [[AVCaptureVideoPreviewLayer alloc] initWithSession:self.session];
[self.preview setVideoGravity:AVLayerVideoGravityResizeAspectFill];
[self.preview setFrame:self.cameraView.frame];
CALayer *cameraLayer = self.cameraView.layer;
[cameraLayer setMasksToBounds:YES];
[cameraLayer addSublayer:self.preview];
for (AVCaptureConnection *connection in output.connections) {
if (connection.supportsVideoOrientation) {
[connection setVideoOrientation:AVCaptureVideoOrientationPortrait];
}
}
NSURL *shutterUrl = [[NSURL alloc] initWithString:[[NSBundle mainBundle] pathForResource: @"shutter" ofType: @"wav"]];
self.shutterPlayer = [[AVAudioPlayer alloc] initWithContentsOfURL:shutterUrl error:nil];
[self.shutterPlayer prepareToPlay];
}
- (void)captureOutput:(AVCaptureOutput *)captureOutput didOutputSampleBuffer:(CMSampleBufferRef)sampleBuffer fromConnection:(AVCaptureConnection *)connection
{
if (self.doCapture) {
self.doCapture = NO;
[self.shutterPlayer setCurrentTime:0];
[self.shutterPlayer play];
CVImageBufferRef imageBuffer = CMSampleBufferGetImageBuffer(sampleBuffer);
CVPixelBufferLockBaseAddress(imageBuffer, 0);
void *baseAddress = CVPixelBufferGetBaseAddress(imageBuffer);
size_t bytesPerRow = CVPixelBufferGetBytesPerRow(imageBuffer);
size_t width = CVPixelBufferGetWidth(imageBuffer);
size_t height = CVPixelBufferGetHeight(imageBuffer);
CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB();
CGContextRef rawContext = CGBitmapContextCreate(baseAddress, width, height, 8, bytesPerRow, colorSpace, kCGBitmapByteOrder32Little | kCGImageAlphaPremultipliedFirst);
CGImageRef quartzImage = CGBitmapContextCreateImage(rawContext);
CVPixelBufferUnlockBaseAddress(imageBuffer, 0);
CGContextRelease(rawContext);
CGColorSpaceRelease(colorSpace);
UIImage *rawImage = [UIImage imageWithCGImage:quartzImage];
CGImageRelease(quartzImage);
float rawWidth = rawImage.size.width;
float rawHeight = rawImage.size.height;
CGRect cropRect = (rawHeight > rawWidth) ? CGRectMake(0, (rawHeight - rawWidth) / 2, rawWidth, rawWidth) : CGRectMake((rawWidth - rawHeight) / 2, 0, rawHeight, rawHeight);
CGImageRef croppedImageRef = CGImageCreateWithImageInRect([rawImage CGImage], cropRect);
UIImage *croppedImage = [UIImage imageWithCGImage:croppedImageRef];
CGImageRelease(croppedImageRef);
[self saveImage:croppedImage];
}
}
- (void)saveImage:(UIImage *)image
{
[self.capturedImages addObject:image];
NSArray *scrollItemXIB = [[NSBundle mainBundle] loadNibNamed:@"SellPreviewImagesScrollItemView" owner:self options:nil];
UIView *scrollItemView = [scrollItemXIB lastObject];
UIImageView *previewImage = (UIImageView *)[scrollItemView viewWithTag:PREVIEW_IMAGES_SCROLL_ITEM_TAG_IMAGE];
previewImage.image = image;
UIButton *deleteButton = (UIButton *)[scrollItemView viewWithTag:PREVIEW_IMAGES_SCROLL_ITEM_TAG_BADGE_BUTTON];
[deleteButton addTarget:self action:@selector(deleteImage:) forControlEvents:UIControlEventTouchUpInside];
UIButton *previewButton = (UIButton *)[scrollItemView viewWithTag:PREVIEW_IMAGES_SCROLL_ITEM_TAG_BUTTON];
[previewButton addTarget:self action:@selector(previewImage:) forControlEvents:UIControlEventTouchUpInside];
[self addItemToScroll:scrollItemView];
[self checkCapturedImagesLimit];
if ([self.capturedImages count] == 1) {
[self makeCoverPhoto:[self.capturedImages objectAtIndex:0]];
[self cells:self.previewImagesToggle setHidden:NO];
[self reloadDataAnimated:YES];
}
}
最佳答案
你在哪里设置 self.doCapture = true ?看起来您为临时对象分配了大量内存。尝试使用@autoreleasepool指令:
@autoreleasepool {
self.doCapture = NO;
[self.shutterPlayer setCurrentTime:0];
[self.shutterPlayer play];
...
if ([self.capturedImages count] == 1) {
[self makeCoverPhoto:[self.capturedImages objectAtIndex:0]];
[self cells:self.previewImagesToggle setHidden:NO];
[self reloadDataAnimated:YES];
}
}
关于ios - AVFoundation 自定义相机导致崩溃/内存压力?,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/24419446/