Re: [PATCH] uvc: Fix bytesperline calculation for planar YUV

[Nicolas Dufresne <nicolas.dufresne@xxxxxxxxxxxxx>]

Le mercredi 13 avril 2016 à 17:36 +0300, Laurent Pinchart a écrit :
> Hi Nicolas,
> 
> Thank you for the patch.
> 
> On Thursday 07 Jan 2016 15:43:48 Nicolas Dufresne wrote:
> > 
> > The formula used to calculate bytesperline only works for packed
> > format.
> > So far, all planar format we support have their bytesperline equal
> > to
> > the image width (stride of the Y plane or a line of Y for M420).
> > 
> > Signed-off-by: Nicolas Dufresne <nicolas.dufresne@xxxxxxxxxxxxx>
> > ---
> >  drivers/media/usb/uvc/uvc_v4l2.c | 18 ++++++++++++++++--
> >  1 file changed, 16 insertions(+), 2 deletions(-)
> > 
> > diff --git a/drivers/media/usb/uvc/uvc_v4l2.c
> > b/drivers/media/usb/uvc/uvc_v4l2.c index d7723ce..ceb1d1b 100644
> > --- a/drivers/media/usb/uvc/uvc_v4l2.c
> > +++ b/drivers/media/usb/uvc/uvc_v4l2.c
> > @@ -142,6 +142,20 @@ static __u32 uvc_try_frame_interval(struct
> > uvc_frame
> > *frame, __u32 interval) return interval;
> >  }
> > 
> > +static __u32 uvc_v4l2_get_bytesperline(struct uvc_format *format,
> > +	struct uvc_frame *frame)
> I'd make the two parameters const.

I agree.

> 
> > 
> > +{
> > +	switch (format->fcc) {
> > +	case V4L2_PIX_FMT_NV12:
> > +	case V4L2_PIX_FMT_YVU420:
> > +	case V4L2_PIX_FMT_YUV420:
> > +	case V4L2_PIX_FMT_M420:
> > +		return frame->wWidth;
> > +	default:
> > +		return format->bpp * frame->wWidth / 8;
> > +	}
> > +}
> > +
> >  static int uvc_v4l2_try_format(struct uvc_streaming *stream,
> >  	struct v4l2_format *fmt, struct uvc_streaming_control
> > *probe,
> >  	struct uvc_format **uvc_format, struct uvc_frame
> > **uvc_frame)
> > @@ -245,7 +259,7 @@ static int uvc_v4l2_try_format(struct
> > uvc_streaming
> > *stream, fmt->fmt.pix.width = frame->wWidth;
> >  	fmt->fmt.pix.height = frame->wHeight;
> >  	fmt->fmt.pix.field = V4L2_FIELD_NONE;
> > -	fmt->fmt.pix.bytesperline = format->bpp * frame->wWidth /
> > 8;
> > +	fmt->fmt.pix.bytesperline =
> > uvc_v4l2_get_bytesperline(format, frame);
> >  	fmt->fmt.pix.sizeimage = probe->dwMaxVideoFrameSize;
> >  	fmt->fmt.pix.colorspace = format->colorspace;
> >  	fmt->fmt.pix.priv = 0;
> > @@ -282,7 +296,7 @@ static int uvc_v4l2_get_format(struct
> > uvc_streaming
> > *stream, fmt->fmt.pix.width = frame->wWidth;
> >  	fmt->fmt.pix.height = frame->wHeight;
> >  	fmt->fmt.pix.field = V4L2_FIELD_NONE;
> > -	fmt->fmt.pix.bytesperline = format->bpp * frame->wWidth /
> > 8;
> > +	fmt->fmt.pix.bytesperline =
> > uvc_v4l2_get_bytesperline(format, frame);
> >  	fmt->fmt.pix.sizeimage = stream->ctrl.dwMaxVideoFrameSize;
> >  	fmt->fmt.pix.colorspace = format->colorspace;
> >  	fmt->fmt.pix.priv = 0;
> This looks good to me otherwise.
> 
> If it's fine with you I can fix the above issue while applying.

That would be really nice.

thanks,
Nicolas

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