斯威夫特2

的iOS CVPixelBufferCreate内存泄漏我试图将图像转换成视频，并以正确的方式似乎使用AVAssetWriter与AVAssetWriterInputPixelBufferAdaptor，和它的作品很好，但它泄漏内存。斯威夫特2

当我将CGImage转换为CVPixelBuffer时，我调用CVPixelBufferCreate，它永远不会释放它的内存。

func CGImageToPixelBuffer(image: CGImageRef, frameSize: CGSize) -> CVPixelBuffer { 

    // stupid CFDictionary stuff 
    let keys: [CFStringRef] = [kCVPixelBufferCGImageCompatibilityKey, kCVPixelBufferCGBitmapContextCompatibilityKey] 
    let values: [CFTypeRef] = [kCFBooleanTrue, kCFBooleanTrue] 
    let keysPointer = UnsafeMutablePointer<UnsafePointer<Void>>.alloc(1) 
    let valuesPointer = UnsafeMutablePointer<UnsafePointer<Void>>.alloc(1) 
    keysPointer.initialize(keys) 
    valuesPointer.initialize(values) 
    let options = CFDictionaryCreate(kCFAllocatorDefault, keysPointer, valuesPointer, keys.count, 
     UnsafePointer<CFDictionaryKeyCallBacks>(), UnsafePointer<CFDictionaryValueCallBacks>()) 

    let buffer = UnsafeMutablePointer<CVPixelBuffer?>.alloc(1) 

    // here's the leak >:[ 
    let status = CVPixelBufferCreate(kCFAllocatorDefault, Int(frameSize.width), Int(frameSize.height), 
     kCVPixelFormatType_32ARGB, options, buffer) 

    CVPixelBufferLockBaseAddress(pixelBuffer.memory!, 0); 
    let bufferData = CVPixelBufferGetBaseAddress(buffer.memory!); 

    let rgbColorSpace = CGColorSpaceCreateDeviceRGB(); 
    let context = CGBitmapContextCreate(bufferData, Int(frameSize.width), 
     Int(frameSize.height), 8, 4*Int(frameSize.width), rgbColorSpace, 
     CGImageAlphaInfo.NoneSkipFirst.rawValue); 

    CGContextDrawImage(context, CGRectMake(0, 0, 
     CGFloat(CGImageGetWidth(image)), 
     CGFloat(CGImageGetHeight(image))), image); 

    CVPixelBufferUnlockBaseAddress(pixelBuffer.memory!, 0); 
    return buffer.memory! 
}

下面是它调用CGImageToPixelBuffer代码

func saveImageAsVideoFile(path: NSURL, image: UIImage, duration: Double) { 
    let writer = try! AVAssetWriter(URL: path, fileType: AVFileTypeQuickTimeMovie) 

    let videoSettings: NSDictionary = [ 
     AVVideoCodecKey : AVVideoCodecH264, 
     AVVideoWidthKey : NSNumber(integer: Int(image.size.width)), 
     AVVideoHeightKey : NSNumber(integer: Int(image.size.height)) 
    ] 
    let input = AVAssetWriterInput(mediaType: AVMediaTypeVideo, outputSettings: videoSettings as? [String : AnyObject]) 
    let inputAdaptor = AVAssetWriterInputPixelBufferAdaptor(assetWriterInput: input, sourcePixelBufferAttributes: nil) 
    input.expectsMediaDataInRealTime = false 
    writer.addInput(input) 
    writer.startWriting() 
    writer.startSessionAtSourceTime(kCMTimeZero) 

    // leak starts here 
    let buffer = CGImageToPixelBuffer(image.CGImage!, frameSize: image.size) 

    // append 30 frames to AVAssetWriter thing 
    for i in 0..<30 
     if input.readyForMoreMediaData { 
      inputAdaptor.appendPixelBuffer(buffer, withPresentationTime: CMTimeMake(i, 30)) 
     } 
    } 

    //CVPixelBufferRelease(buffer) ?? 

    input.markAsFinished() 
    writer.finishWritingWithCompletionHandler({() -> Void in 
     print("yay") 
    }) 
}

CVPixelBufferRelease不迅速2

CVPixelBufferCreate斯威夫特2不返回非托管指针可用，所以我不能使用这guys code

我试过手动调用销毁和dealloc上unsafepointer，无济于事。

每次它被称为它增加了内存使用情况，并会崩溃的设备，如果所谓的足够

任何帮助或建议，将不胜感激时间

。

来源

2015-11-16 Reuben Crimp

您的let buffer = UnsafeMutablePointer<CVPixelBuffer?>.alloc(1)未被dealloc所平衡，但补充说明似乎并未解决泄漏问题。只需用一个CVPixelBuffer?做虽然，似乎简单了：

var buffer: CVPixelBuffer? 

// TODO: handle status != noErr 
let status = CVPixelBufferCreate(kCFAllocatorDefault, Int(frameSize.width), Int(frameSize.height), 
    kCVPixelFormatType_32ARGB, options, &buffer) 

CVPixelBufferLockBaseAddress(buffer!, 0); 
let bufferData = CVPixelBufferGetBaseAddress(buffer!); 

let rgbColorSpace = CGColorSpaceCreateDeviceRGB(); 
let context = CGBitmapContextCreate(bufferData, Int(frameSize.width), 
    Int(frameSize.height), 8, 4*Int(frameSize.width), rgbColorSpace, 
    CGImageAlphaInfo.NoneSkipFirst.rawValue); 

CGContextDrawImage(context, CGRectMake(0, 0, 
    CGFloat(CGImageGetWidth(image)), 
    CGFloat(CGImageGetHeight(image))), image); 

CVPixelBufferUnlockBaseAddress(buffer!, 0);

你也应该处理status != noErr和解开任选缓冲越快，以避免所有这些buffer!秒。

来源

2015-11-17 01:41:32

我也有类似的泄漏。我不确定，但我认为可以使用以下内容：

let bufferPointer = UnsafeMutablePointer<CVPixelBuffer?>.alloc(1) 
... 
let pixelBuffer = bufferPointer.memory! 
bufferPointer.destroy() 
return pixelBuffer

来源

2015-11-23 11:46:58

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