[FFmpeg-devel] [PATCH] lavfi/minterpolate: fix blending calc issue.

[Steven Liu]

mypopy at gmail.com <mypopy at gmail.com> 于2018年7月4日周三 下午3:05写道：
>
> On Wed, Jun 27, 2018 at 5:52 PM Jun Zhao <mypopydev at gmail.com> wrote:
> >
> > the right blending calc is:
> > (alpha * Frame_2 + (MAX - alpha) * Frame_1 + 512) >> 10
> >
> > Signed-off-by: Jun Zhao <mypopydev at gmail.com>
> > ---
> >  libavfilter/vf_minterpolate.c | 4 ++--
> >  1 file changed, 2 insertions(+), 2 deletions(-)
> >
> > diff --git a/libavfilter/vf_minterpolate.c b/libavfilter/vf_minterpolate.c
> > index d534315..c6a5e63 100644
> > --- a/libavfilter/vf_minterpolate.c
> > +++ b/libavfilter/vf_minterpolate.c
> > @@ -1122,8 +1122,8 @@ static void interpolate(AVFilterLink *inlink,
> AVFrame *avf_out)
> >                  for (y = 0; y < height; y++) {
> >                      for (x = 0; x < width; x++) {
> >                          avf_out->data[plane][x + y * avf_out->linesize[plane]]
> =
> > -                                          alpha  * mi_ctx->frames[2].avf->data[plane][x
> + y * mi_ctx->frames[2].avf->linesize[plane]] +
> > -                            ((ALPHA_MAX - alpha) * mi_ctx->frames[1].avf->data[plane][x
> + y * mi_ctx->frames[1].avf->linesize[plane]] + 512) >> 10;
> > +                            (alpha  * mi_ctx->frames[2].avf->data[plane][x
> + y * mi_ctx->frames[2].avf->linesize[plane]] +
> > +                             (ALPHA_MAX - alpha) * mi_ctx->frames[1].avf->data[plane][x
> + y * mi_ctx->frames[1].avf->linesize[plane]] + 512) >> 10;
> >                      }
> >                  }
> >              }
> > --
> > 2.7.4
> >
> ping, any comments for this fix?

LGTM

Go on improve it to OpenCL :D
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