private static IEnumerable<string> GetPixelLayoutStrings(YCbCrPixelLayout pixelLayout)
{
var strings = new List<string>
{
"Cb Offset: " + pixelLayout.CbOffset,
"Cb Pitch: " + pixelLayout.CbPitch,
"Cb X Pitch: " + pixelLayout.CbXPitch,
"Cr Offset: " + pixelLayout.CrOffset,
"Cr Pitch: " + pixelLayout.CrPitch,
"Cr X Pitch: " + pixelLayout.CrXPitch
};
return strings;
}
private void GetYCbCrFromPixel(YCbCrPixelLayout layout, byte[] currentPreviewBuffer, int xFramePos, int yFramePos, out byte y, out int cr, out int cb)
{
// Find the bytes corresponding to the pixel location in the frame.
int yBufferIndex = layout.YOffset + yFramePos * layout.YPitch + xFramePos * layout.YXPitch;
int crBufferIndex = layout.CrOffset + (yFramePos / 2) * layout.CrPitch + (xFramePos / 2) * layout.CrXPitch;
int cbBufferIndex = layout.CbOffset + (yFramePos / 2) * layout.CbPitch + (xFramePos / 2) * layout.CbXPitch;
// The luminance value is always positive.
y = currentPreviewBuffer[yBufferIndex];
// The preview buffer contains an unsigned value between 255 and 0.
// The buffer value is cast from a byte to an integer.
cr = currentPreviewBuffer[crBufferIndex];
// Convert to a signed value between 127 and -128.
cr -= 128;
// The preview buffer contains an unsigned value between 255 and 0.
// The buffer value is cast from a byte to an integer.
cb = currentPreviewBuffer[cbBufferIndex];
// Convert to a signed value between 127 and -128.
cb -= 128;
}
/// <summary>
/// Gets the Y, Cb and Cr values from pixel.
/// </summary>
/// <param name="layout">The layout.</param>
/// <param name="currentPreviewBuffer">The current preview buffer.</param>
/// <param name="xFramePos">The x frame pos.</param>
/// <param name="yFramePos">The y frame pos.</param>
/// <param name="y">The y.</param>
/// <param name="cr">The cr.</param>
/// <param name="cb">The cb.</param>
private void GetYCbCrFromPixel(YCbCrPixelLayout layout, byte[] currentPreviewBuffer, int xFramePos, int yFramePos, out byte y, out int cr, out int cb)
{
// Find the bytes corresponding to the pixel location in the frame.
int yBufferIndex = layout.YOffset + (yFramePos * layout.YPitch) + (xFramePos * layout.YXPitch);
int crBufferIndex = layout.CrOffset + ((yFramePos / 2) * layout.CrPitch) + ((xFramePos / 2) * layout.CrXPitch);
int cbBufferIndex = layout.CbOffset + ((yFramePos / 2) * layout.CbPitch) + ((xFramePos / 2) * layout.CbXPitch);
// The luminance value is always positive.
y = currentPreviewBuffer[yBufferIndex];
// The preview buffer contains an unsigned value between 255 and 0.
// The buffer value is cast from a byte to an integer.
cr = currentPreviewBuffer[crBufferIndex];
// Convert to a signed value between 127 and -128.
cr -= 128;
// The preview buffer contains an unsigned value between 255 and 0.
// The buffer value is cast from a byte to an integer.
cb = currentPreviewBuffer[cbBufferIndex];
// Convert to a signed value between 127 and -128.
cb -= 128;
}
