On Mon, 16 Mar 2009, Trent Piepho wrote:
> On Mon, 16 Mar 2009, Robert Jarzmik wrote:
> > >> + if (xlate->host_fmt->fourcc == V4L2_PIX_FMT_YUV422P) {
> > >> + if (!IS_ALIGNED(pix->width * pix->height,
> > >> PIX_YUV422P_ALIGN))
> > >> + pix->height = ALIGN(pix->height,
> > >> PIX_YUV422P_ALIGN / 2);
> > >> + if (!IS_ALIGNED(pix->width * pix->height,
> > >> PIX_YUV422P_ALIGN))
> > >> + pix->width = ALIGN(pix->width,
> > >> PIX_YUV422P_ALIGN / 2);
> > >
> > > Shouldn't this have been sqrt(PIX_YUV422P_ALIGN) (of course, not
> > > literally) instead of PIX_YUV422P_ALIGN / 2? At least above you say,
> > > height and width shall be 4 bytes aligned, not 8.
> > That's a very good catch.
> > Maybe 2 defines will fit better, as I'm not very please with log2 logic
> > here ... :
> >
> > /*
> > * YUV422P picture size should be a multiple of 16, so the heuristic aligns
> > * height, width on 4 byte boundaries to reach the 16 multiple for the size.
> > */
> > #define YUV422P_X_Y_ALIGN 4
> > #define YUV422P_SIZE_ALIGN YUV422P_X_Y_ALIGN * YUV422P_X_Y_ALIGN
>
> Before you spend too much time on this, maybe I could offer a patch to use
> the generic alignment function I posted before? I beleive the method in
> that code will produce better results I think there are multiple drivers
> that could make use of it.
As Robert already replied to you: submit your patches, get them into
mainline, then we'll gladly switch to them if they suit our purpose.
Thanks
Guennadi
---
Guennadi Liakhovetski, Ph.D.
Freelance Open-Source Software Developer
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