BITMASKS macro (amvideo.h)

Article
4/26/2023

[The feature associated with this page, DirectShow, is a legacy feature. It has been superseded by MediaPlayer, IMFMediaEngine, and Audio/Video Capture in Media Foundation. Those features have been optimized for Windows 10 and Windows 11. Microsoft strongly recommends that new code use MediaPlayer, IMFMediaEngine and Audio/Video Capture in Media Foundation instead of DirectShow, when possible. Microsoft suggests that existing code that uses the legacy APIs be rewritten to use the new APIs if possible.]

The BITMASKS macro retrieves the color masks from a VIDEOINFO structure.

Syntax

void BITMASKS(
   pbmi
);

Parameters

pbmi

Pointer to a VIDEOINFO structure.

Return value

None

Remarks

This macro calculates the address as an offset from the start of the BITMAPINFOHEADER structure, using the value of bmiHeader.biSize. Make sure to initialize the VIDEOINFO structure before calling this macro.

You can access the color masks in the array using the following constants, defined in Amvideo.h:

#define iRED   0
#define iGREEN 1
#define iBLUE  2

Examples

VIDEOINFO *pVi;

/* Initialize pVi (not shown). */

DWORD dwRed   = BITMASKS(pVi)[iRED];
DWORD dwGreen = BITMASKS(pVi)[iGREEN]; 
DWORD dwBlue  = BITMASKS(pVi)[iBLUE];

Requirements

Requirement	Value
Target Platform	Windows
Header	amvideo.h (include Streams.h)

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