A format-agnostic way of converting CVPixelBuffer to Data and back

CVPixelBuffer+Data.swift

extension CVPixelBuffer {
    public static func from(_ data: Data, width: Int, height: Int, pixelFormat: OSType) -> CVPixelBuffer {
        data.withUnsafeBytes { buffer in
            var pixelBuffer: CVPixelBuffer!

            let result = CVPixelBufferCreate(kCFAllocatorDefault, width, height, pixelFormat, nil, &pixelBuffer)
            guard result == kCVReturnSuccess else { fatalError() }

            CVPixelBufferLockBaseAddress(pixelBuffer, [])
            defer { CVPixelBufferUnlockBaseAddress(pixelBuffer, []) }

            var source = buffer.baseAddress!

            for plane in 0 ..< CVPixelBufferGetPlaneCount(pixelBuffer) {
                let dest      = CVPixelBufferGetBaseAddressOfPlane(pixelBuffer, plane)
                let height      = CVPixelBufferGetHeightOfPlane(pixelBuffer, plane)
                let bytesPerRow = CVPixelBufferGetBytesPerRowOfPlane(pixelBuffer, plane)
                let planeSize = height * bytesPerRow

                memcpy(dest, source, planeSize)
                source += planeSize
            }

            return pixelBuffer
        }
    }
}

extension Data {
    public static func from(pixelBuffer: CVPixelBuffer) -> Self {
        CVPixelBufferLockBaseAddress(pixelBuffer, [.readOnly])
        defer { CVPixelBufferUnlockBaseAddress(pixelBuffer, [.readOnly]) }

        // Calculate sum of planes' size
        var totalSize = 0
        for plane in 0 ..< CVPixelBufferGetPlaneCount(pixelBuffer) {
            let height      = CVPixelBufferGetHeightOfPlane(pixelBuffer, plane)
            let bytesPerRow = CVPixelBufferGetBytesPerRowOfPlane(pixelBuffer, plane)
            let planeSize   = height * bytesPerRow
            totalSize += planeSize
        }

        guard let rawFrame = malloc(totalSize) else { fatalError() }
        var dest = rawFrame

        for plane in 0 ..< CVPixelBufferGetPlaneCount(pixelBuffer) {
            let source      = CVPixelBufferGetBaseAddressOfPlane(pixelBuffer, plane)
            let height      = CVPixelBufferGetHeightOfPlane(pixelBuffer, plane)
            let bytesPerRow = CVPixelBufferGetBytesPerRowOfPlane(pixelBuffer, plane)
            let planeSize   = height * bytesPerRow

            memcpy(dest, source, planeSize)
            dest += planeSize
        }

        return Data(bytesNoCopy: rawFrame, count: totalSize, deallocator: .free)
    }
}

great but at #14

 for plane in 0 ..< CVPixelBufferGetPlaneCount(pixelBuffer) {
}

seems won't enter

@ufogxl Sorry for confusing title, this is snippet is intended for planar pixel data, such as this.