Video for windows API

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2 total messages Started by Tony Forgan Wed, 30 Apr 2003 03:38

#16698

Author: Tony Forgan
Date: Wed, 30 Apr 2003 03:38

24 lines
1716 bytes

Hi,

Sorry if I am in the wrong group for this, but I think it is borderline
Multimedia/API.

Anyhow, I am using Video For Windows API to display a capture window in my
app. I have set a frame call back function to perform processing on a frame
of the video being displayed.

VIDEOHDR VideoHeader;
byte VideoData[152064];

MoveMemory(&VideoHeader, lpVHdr, sizeof(VideoHeader));
MoveMemory(VideoData, VideoHeader.lpData, VideoHeader.dwBytesUsed);

What I am wanting to do is extract the R,G & B values for each pixel. I
can't seem to work out how to do it. I have displayed each pixel using the
byte value of each pixel, which gives a result of only the Red values.

Any hints?

Thanks,

Tony Forgan.

Re: Video for windows API

#16699

Author: Remy Lebeau (TeamB)
Date: Wed, 30 Apr 2003 05:50

21 lines
1811 bytes

"Tony Forgan" <tony@wildlime.com> wrote in message
news:3eaf45c3@newsgroups.borland.com...

> What I am wanting to do is extract the R,G & B values for each
> pixel. I can't seem to work out how to do it. I have displayed
> each pixel using the byte value of each pixel, which gives a result
> of only the Red values.

All I know is that you need to call capGetVideoFormat() to know the actual
format of the image that is returned in the VIDEOHDR structure.  The
BITMAPINFO structure you pass to capGetVideoFormat() will be filled in with
information telling you the formatting of the bitmap contained in the
VIDEOHDR.  The image itself will be in either YUV or RGB format, depending
on the settings of the capture.

Asside from that, there's not much in the way of public documentation when
it comes to working with VIDEOHDR that I can find.


Gambit

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