[FFmpeg-devel] [PATCH 1/3] swscale: don't assign range converters for float

[Chen, Wenbin]

> On Mon, 27 Nov 2023 02:10:11 +0000 "Chen, Wenbin" <wenbin.chen-at-
> intel.com at ffmpeg.org> wrote:
> > > > From: Niklas Haas <git at haasn.dev>
> > > >
> > > > This logic was incongruent with logic used elsewhere, where floating
> > > > point formats are explicitly exempted from range conversion. Fixes an
> > > > issue where floating point formats were not going through special
> > > > unscaled converters even when it was otherwise possible.
> > > > ---
> > > >  libswscale/swscale.c | 3 ++-
> > > >  1 file changed, 2 insertions(+), 1 deletion(-)
> > > >
> > > > diff --git a/libswscale/swscale.c b/libswscale/swscale.c
> > > > index 46ba68fe6a..a66db22767 100644
> > > > --- a/libswscale/swscale.c
> > > > +++ b/libswscale/swscale.c
> > > > @@ -534,7 +534,8 @@ av_cold void
> ff_sws_init_range_convert(SwsContext
> > > > *c)
> > > >  {
> > > >      c->lumConvertRange = NULL;
> > > >      c->chrConvertRange = NULL;
> > > > -    if (c->srcRange != c->dstRange && !isAnyRGB(c->dstFormat)) {
> > > > +    if (c->srcRange != c->dstRange && !isAnyRGB(c->dstFormat) &&
> > > > +        !isFloat(c->srcFormat) && !isFloat(c->dstFormat)) {
> > > >          if (c->dstBpc <= 14) {
> > > >              if (c->srcRange) {
> > > >                  c->lumConvertRange = lumRangeFromJpeg_c;
> > > > --
> > > > 2.42.0
> > > >
> > >
> > > This patchset works for me. Thanks for your quick fixing.
> >
> > Ping. When can this patchset be merged?
> 
> Hi, do you still need this patch, now that YUV negotiation means
> vf_scale no longer changes the filter range dynamically?

The problem is not solved.
Command " ffmpeg -i input.png -vf format=grayf32,format=gray8 output.png " still reports
error: "Assertion c->srcBpc == 16 failed at libswscale/x86/swscale.c:533"
After I add --disable-sse2, the problem is unseen.

> 
> >
> > Thanks
> > Wenbin
> > >
> > > > _______________________________________________
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