Video and Image Processing Suite User Guide

ID 683416
Date 2/12/2021
Public

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7.3. Clocked Video Input IP Format Detection

The IP detects the format of the incoming clocked video and use it to create the Avalon streaming video control packet. The IP also provides this information in a set of registers.
Table 18.  Format DetectionThe IP can detect different aspects of the incoming video stream.
Format Description
Picture width (in samples)
  • The IP counts the total number of samples per line, and the number of samples in the active picture period.
  • One full line of video is required before the IP can determine the width.
Picture height (in lines)
  • The IP counts the total number of lines per frame or field, and the number of lines in the active picture period.
  • One full frame or field of video is required before the IP can determine the height.
Interlaced/Progressive
  • The IP detects whether the incoming video is interlaced or progressive.
  • If it is interlaced, separate height values are stored for both fields.
  • One full frame or field of video and a line from a second frame or field are required before the IP can determine whether the source is interlaced or progressive.
Standard
  • The IP provides the contents of the vid_std bus through the Standard register.
  • When connected to the rx_std signal of an SDI IP instance, for example, these values can be used to report the standard (SD, HD, 3G, 6G, or 12G) of the incoming video.
Note: In 3G, 6G, and 12G modes, the IP only supports YCbCr input color format with either 8 or 10 bits for each component.