YUV buffer pstride and rstride clarification needed
ding at panopto.com
Mon Jul 15 21:52:12 UTC 2019
I hope someone can correct me if I am wrong, but I am guessing that
- pstride = pixel stride (i.e. the number of bytes per pixel)
- rstride = row stride (i.e. the number of bytes per row of pixels)
Suppose I want to find the pixel (row=y, column=x), then I should look at
the following location within the byte array:
- y * rstride + x * pstride
Keep in mind that I am a complete novice ... this is just a guess.
On Mon, Jul 15, 2019 at 2:45 PM Neil Young <foreverneilyoung at googlemail.com>
> I'm referring to this documentation
> Up to now I received namely I420 buffers with a size of 1.5*width*height,
> as expected default YUV size.
> video/x-raw, format=(string)I420, width=(int)720, height=(int)540,
> interlace-mode=(string)progressive, multiview-mode=(string)mono,
> pixel-aspect-ratio=(fraction)1/1, chroma-site=(string)jpeg,
> colorimetry=(string)bt601, framerate=(fraction)0/1;
> Frame buffer size is 583200 byte.
> Today for the first time I got this:
> video/x-raw(memory:VASurface), format=(string)NV12, width=(int)720,
> height=(int)540, interlace-mode=(string)progressive,
> pixel-aspect-ratio=(fraction)1/1, framerate=(fraction)0/1
> with a frame buffer size of 622080 byte, which is more than 1.5 * width *
> Now I'm wondering, how to understand the values of rstride and pstride in
> the above document. Could somebody help please?
> gstreamer-devel mailing list
> gstreamer-devel at lists.freedesktop.org
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