ios - CVPixelBufferCreateWithPlanarBytes 返回 -6661 (kCVReturnInvalidArgument)

Question

我正在尝试对 CVPixelBuffer 进行深度复制。我收到错误 kCVReturnInvalidArgument 或值 -661。我已经验证了每个参数的类型和数组的长度，但我找不到我编码错误的地方。我希望有人会发现它。

代码如下:

func clonePixelBuffer(pixelBuffer: CVPixelBuffer) -> CVPixelBuffer? {
    CVPixelBufferLockBaseAddress(pixelBuffer, 0)
    let height = CVPixelBufferGetHeight(pixelBuffer)
    let width = CVPixelBufferGetWidth(pixelBuffer)
    let numberOfPlanes = CVPixelBufferGetPlaneCount(pixelBuffer)
    var planeBaseAddresses = [UnsafeMutablePointer<Void>]()
    var planeWidths = [Int]()
    var planeHeights = [Int]()
    var planeBytesPerRows = [Int]()
    for i in 0..<numberOfPlanes {
        planeBaseAddresses.append(CVPixelBufferGetBaseAddressOfPlane(pixelBuffer, 0))
        planeWidths.append(CVPixelBufferGetWidthOfPlane(pixelBuffer, i))
        planeHeights.append(CVPixelBufferGetHeightOfPlane(pixelBuffer, i))
        planeBytesPerRows.append(CVPixelBufferGetHeightOfPlane(pixelBuffer, i))
    }
    let newPixelBuffer = UnsafeMutablePointer<CVPixelBuffer?>()
    let status = CVPixelBufferCreateWithPlanarBytes(nil, width, height, kCVPixelFormatType_420YpCbCr8BiPlanarVideoRange, nil, 0, numberOfPlanes, &planeBaseAddresses, &planeWidths, &planeHeights, &planeBytesPerRows, nil, nil, nil, newPixelBuffer)
    CVPixelBufferUnlockBaseAddress(pixelBuffer, 0)
    if status == noErr { <------ status = -6661
        return newPixelBuffer.memory
    }
    return nil
}

Answer 1

不确定是不是这样，但是 bytesPerRows 行上有一个复制粘贴错误——它说

planeBytesPerRows.append(CVPixelBufferGetHeightOfPlane(pixelBuffer, i))

但应该是

planeBytesPerRows.append(CVPixelBufferGetBytesPerRowOfPlane(pixelBuffer, i))

您也可以转发 FormatType 而不是对其进行硬编码。

据我了解 CVPixelBufferRef，这实际上不会复制像素缓冲区的数据，只是将一个 PixelBuffer 中的数据引用到另一个 PixelBuffer 中的数据。您需要为平面分配您自己的内存区域，引用该范围内的数据，然后在 CVPixelBufferRef 被销毁后向该内存提供一个 Free 回调函数 free()。