private unsafe void _processBitmap(SoftwareBitmap bitmap, TimeSpan duration)
{
using (var buffer = bitmap.LockBuffer(BitmapBufferAccessMode.Read))
{
var reference = (IMemoryBufferByteAccess)buffer.CreateReference();
reference.GetBuffer(out byte *nativeBuffer, out uint capacity);
byte[] frameBuffer = new byte[capacity];
for (int i = 0; i < bitmap.PixelHeight; i++)
{
for (int j = 0; j < bitmap.PixelWidth; j++)
{
var indexManaged = (i * bitmap.PixelWidth + j) * 4;
var indexNative = ((bitmap.PixelHeight - 1 - i) * bitmap.PixelWidth + j) * 4;
frameBuffer[indexManaged + 0] = nativeBuffer[indexNative + 0];
frameBuffer[indexManaged + 1] = nativeBuffer[indexNative + 1];
frameBuffer[indexManaged + 2] = nativeBuffer[indexNative + 2];
frameBuffer[indexManaged + 3] = nativeBuffer[indexNative + 3];
}
}
_mediaEncoder.WriteVideoFrame(frameBuffer, duration.Ticks);
}
}