Question

我试图编写一种方法来调整在Swift中捕获的图像的大小，但是在我的函数循环（实时捕获帧）中，捕获了几秒钟后发生了一个错误。我意识到我没有在分配内存，所以我添加了defer语句来执行此操作，但是这些defer语句抛出malloc错误，表明我尚未分配内存，但是我认为我已经正确分配了内存。因此，我无法释放正在分配的内存。

我尝试添加CVPixelBuffer（Un）LockBaseAddress语句，但是没有执行任何操作。

private func resizePixelBuffer(imageBuffer: CVPixelBuffer, scaleWidth: Int, scaleHeight: Int) -> CVPixelBuffer? {
        CVPixelBufferLockBaseAddress(imageBuffer, CVPixelBufferLockFlags(rawValue: 0))
        guard let baseAddress = CVPixelBufferGetBaseAddress(imageBuffer) else {return nil}
        let bytes_per_row = CVPixelBufferGetBytesPerRow(imageBuffer)
        let width = CVPixelBufferGetWidth(imageBuffer)
        let height = CVPixelBufferGetHeight(imageBuffer)

        // Allocate input buffer
        var inBuff = vImage_Buffer(data: baseAddress, height: vImagePixelCount(height), width: vImagePixelCount(width), rowBytes: bytes_per_row)
        defer { free(inBuff.data) } // ADDED

        // Allocate output container
        let outData = UnsafeMutablePointer<UInt8>.allocate(capacity: 4*scaleWidth*scaleHeight)
        defer { outData.deallocate() } // ADDED

        // Assign output buffer
        var outBuff = vImage_Buffer(data: outData, height: vImagePixelCount(scaleHeight), width: vImagePixelCount(scaleWidth), rowBytes: 4*scaleWidth)
        defer { free(outBuff.data) } // ADDED

        let releaseCallback: CVPixelBufferReleaseBytesCallback = {_, ptr in
            if let ptr = ptr {
                free(UnsafeMutableRawPointer(mutating: ptr))
            }
        }
        // Assign output data
        let error = vImageScale_ARGB8888(&inBuff, &outBuff, nil, vImage_Flags(kvImageHighQualityResampling))
        guard error == kvImageNoError else {return nil}
        CVPixelBufferUnlockBaseAddress(imageBuffer, CVPixelBufferLockFlags(rawValue: 0))

        ...
    }

python-ios-integration(2477,0x16cf5f000) malloc: *** error for object 0x10e84c000: pointer being freed was not allocated; python-ios-integration(2477,0x16cf5f000) malloc: *** set a breakpoint in malloc_error_break to debug

Swift：无法取消分配内存

0 个答案: