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# CGDisplayStream

A reference to a display stream object.

```
class CGDisplayStream
```

## Overview

This data type streams the contents of a display to your app. The contents can be scaled or converted to a different color space. You can also choose to capture only a portion of a display. Your update handler can be called either from a traditional`CFRunLoop` or on a dispatch queue.

## Topics

### Type Properties

[`yCbCrMatrix_ITU_R_601_4`](/documentation/CoreGraphics/CGDisplayStream/yCbCrMatrix_ITU_R_601_4)

Specifies the YCbCr to RGB conversion matrix for standard digital television (ITU R 601) images.

[`yCbCrMatrix_ITU_R_709_2`](/documentation/CoreGraphics/CGDisplayStream/yCbCrMatrix_ITU_R_709_2)

Specifies the YCbCr to RGB conversion matrix for HDTV digital television (ITU R 709) images.

[`yCbCrMatrix_SMPTE_240M_1995`](/documentation/CoreGraphics/CGDisplayStream/yCbCrMatrix_SMPTE_240M_1995)

Specifies the YCbCR to RGB conversion matrix for 1920 x 1135 HDTV (SMPTE 240M 1995).


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