[Libav-user] Using swcale to crop picture

[Eric Beuque]

Hi,

I'm using avcodec and swcale to to display a MPJEG stream in a Qt
application.

avcodec decode image as YUV image and swscale rescale it in a RGB32 image
to fit in the windows.

I would like to provide a zoom feature, i so i am wondering if any way
exists with swscale to rescale only the selected region. For example, I got
an original YUV image as 1280x800 pixels, the destination widget is 640x480
pixels, but i want only to display the region [0,0] to [320,240].

Is swscale able to to that? I have some difficulties to understand all
variables in the documentation.

Thank for your help
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