[FFmpeg-devel] [PATCH 1/2] avformat/mov: Rework the AVIF parser to handle multiple items

[Vignesh Venkatasubramanian]

On Wed, Jul 13, 2022 at 9:12 AM Vignesh Venkatasubramanian
<vigneshv at google.com> wrote:
>
> On Mon, Jul 11, 2022 at 3:25 PM James Zern
> <jzern-at-google.com at ffmpeg.org> wrote:
> >
> > On Thu, Jun 30, 2022 at 2:04 PM Vignesh Venkatasubramanian
> > <vigneshv-at-google.com at ffmpeg.org> wrote:
> > >
> > > Stores the item ids of all the items found in the file and
> > > processes the primary item at the end of the meta box. This patch
> > > does not change any behavior. It sets up the code for parsing
> > > alpha channel (and possibly images with 'grid') in follow up
> > > patches.
> > >
> > > Signed-off-by: Vignesh Venkatasubramanian <vigneshv at google.com>
> > > ---
> > >  libavformat/isom.h |   4 ++
> > >  libavformat/mov.c  | 148 ++++++++++++++++++++++++++++-----------------
> > >  2 files changed, 97 insertions(+), 55 deletions(-)
> > >
> > > [...]
> >
> > @@ -4692,9 +4755,25 @@ static int mov_read_meta(MOVContext *c,
> > AVIOContext *pb, MOVAtom atom)
> >          tag = avio_rl32(pb);
> >          atom.size -= 4;
> >          if (tag == MKTAG('h','d','l','r')) {
> > +            int ret;
> >              avio_seek(pb, -8, SEEK_CUR);
> >              atom.size += 8;
> > -            return mov_read_default(c, pb, atom);
> > +            ret = mov_read_default(c, pb, atom);
> > +            if (ret < 0)
> >
> > In some other cases these two lines are combined, if ((ret = ...
> >
>
> Done.
>
> > +                return ret;
> > +            if (c->is_still_picture_avif) {
> > +                int ret;
> > +                // Add a stream for the YUV planes (primary item).
> > +                ret = avif_add_stream(c, c->primary_item_id);
> > +                if (ret)
> >
> > This could be updated too and use '< 0' to match other code.
> >
>
> Done.
>
> > +                    return ret;
> > +                // For still AVIF images, the meta box contains all the
> > +                // necessary information that would generally be
> > provided by the
> > +                // moov box. So simply mark that we have found the moov box so
> > +                // that parsing can continue.
> > +                c->found_moov = 1;
> > +            }
> > +            return ret;
> >          }
> > _______________________________________________
> > ffmpeg-devel mailing list
> > ffmpeg-devel at ffmpeg.org
> > https://ffmpeg.org/mailman/listinfo/ffmpeg-devel
> >
> > To unsubscribe, visit link above, or email
> > ffmpeg-devel-request at ffmpeg.org with subject "unsubscribe".
>
>
>
> --
> Vignesh

Any further comments on this one?

Please note that i have abandoned the second patch in this list. But
this one is still up for merging.

-- 
Vignesh