WPD_VIDEO_SCAN_TYPES enumeration

The WPD_VIDEO_SCAN_TYPES enumeration type describes how the fields in a video file are encoded.

Syntax

typedef enum WPD_VIDEO_SCAN_TYPES { 
  WPD_VIDEO_SCAN_TYPE_UNUSED                           = 0,
  WPD_VIDEO_SCAN_TYPE_PROGRESSIVE                      = 1,
  WPD_VIDEO_SCAN_TYPE_FIELD_INTERLEAVED_UPPER_FIRST    = 2,
  WPD_VIDEO_SCAN_TYPE_FIELD_INTERLEAVED_LOWER_FIRST    = 3,
  WPD_VIDEO_SCAN_TYPE_FIELD_SINGLE_UPPER_FIRST         = 4,
  WPD_VIDEO_SCAN_TYPE_FIELD_SINGLE_LOWER_FIRST         = 5,
  WPD_VIDEO_SCAN_TYPE_MIXED_INTERLACE                  = 6,
  WPD_VIDEO_SCAN_TYPE_MIXED_INTERLACE_AND_PROGRESSIVE  = 7
} ;

Constants

WPD_VIDEO_SCAN_TYPE_UNUSED

The scan type has not been defined for this video file, or is not applicable.

WPD_VIDEO_SCAN_TYPE_PROGRESSIVE

A progressive scan video file.

WPD_VIDEO_SCAN_TYPE_FIELD_INTERLEAVED_UPPER_FIRST

An interleaved video file where the fields alternate and the upper field (with line 1) is drawn first. For more information, see the Remarks section.

WPD_VIDEO_SCAN_TYPE_FIELD_INTERLEAVED_LOWER_FIRST

An interleaved video file where the fields alternate and the lower field (with line 2) is drawn first. For more information, see Remarks, following this section.

WPD_VIDEO_SCAN_TYPE_FIELD_SINGLE_UPPER_FIRST

An interleaved video file where the fields are sent as contiguous samples and the upper field (with line 1) is drawn first. For more information, see Remarks, following this section.

WPD_VIDEO_SCAN_TYPE_FIELD_SINGLE_LOWER_FIRST

An interleaved video file where the fields are sent as contiguous samples and the lower field (with line 2) is sent first.

WPD_VIDEO_SCAN_TYPE_MIXED_INTERLACE

A video file with a mix of interlacing modes.

WPD_VIDEO_SCAN_TYPE_MIXED_INTERLACE_AND_PROGRESSIVE

A video file with a mix of interlaced and progressive modes.

Remarks

This enumeration is used by the WPD_VIDEO_SCAN_TYPE property.

There are two types of interleaved file formats that are specified by this enumeration. WPD_VIDEO_SCAN_TYPE_FIELD_INTERLEAVED refers to a file format where frames are delivered as they were scanned fields alternate and data goes line by line, as shown here:

Frame 1

Field 1: Line 1

Field 2: Line 1

Field 1: Line 2

Field 2: Line 2

Field 1: Line 3

Field 2: Line 3

...

WPD_VIDEO_SCAN_TYPE_FIELD_SINGLE refers to a file format where each field is stored in a single block of scan lines, and fields are stored sequentially, as shown here:

Frame 1

Field 1: Line 1

Field 1: Line 2

Field 1: Line 3

...

Followed by

Field 2: Line 1

Field 2: Line 2

Field 2: Line 3

...

Requirements

See also

Structures and Enumeration Types