video capture driver

NTDEV
1

hi,

i am developing a wdm video capture driver. this would appear as a filter
in the directshow in user mode.

now my usb card does not give me full frames but gives me just two lines of
video data.

should i accumulate lines (to make a frame) and then copy the frame data in
SRB_READ_DATA or should i transfer the read lines immediately. does user
mode directshow support such transfers or are they based on frame based
transfers( based on the frame size where the captured data will be
displayed).

any pointers on this will be appreciated.

regards,
anubhav.

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2

At least 1394 DV driver accumulates the complete frames.
Looks like this is format-dependent thing.

Max

----- Original Message -----
From: “anubhav”
To: “NT Developers Interest List”
Sent: Thursday, January 03, 2002 1:11 AM
Subject: [ntdev] video capture driver

> hi,
>
> i am developing a wdm video capture driver. this would appear as a filter
> in the directshow in user mode.
>
> now my usb card does not give me full frames but gives me just two lines of
> video data.
>
> should i accumulate lines (to make a frame) and then copy the frame data in
> SRB_READ_DATA or should i transfer the read lines immediately. does user
> mode directshow support such transfers or are they based on frame based
> transfers( based on the frame size where the captured data will be
> displayed).
>
> any pointers on this will be appreciated.
>
> regards,
> anubhav.
>
> —
> You are currently subscribed to ntdev as: xxxxx@storagecraft.com
> To unsubscribe send a blank email to leave-ntdev-$subst(‘Recip.MemberIDChar’)@lists.osr.com
>

—
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