Re: [FFmpeg-devel] [PATCH 1/2] libavutil/dovi_meta: Add nlq_pivots to AVDOVIDataMapping

[quietvoid <tcchlisop0@gmail.com>]

On Sat, Jun 11, 2022 at 12:48 PM Andreas Rheinhardt
<andreas.rheinhardt@outlook.com> wrote:
>
> quietvoid:
> > The NLQ pivots are not documented but should be present
> > in the header for profile 7 RPU format.
> > It has been verified using Dolby's verification toolkit.
> >
> > Also implemented the parsing in libavcodec/dovi_rpu.c.
> > And added the info to ffprobe and showinfo.
> > ---
> >  fftools/ffprobe.c         | 4 ++++
> >  libavcodec/dovi_rpu.c     | 7 +++++++
> >  libavfilter/vf_showinfo.c | 8 ++++++++
> >  libavutil/dovi_meta.h     | 1 +
> >  4 files changed, 20 insertions(+)
> >
> > diff --git a/fftools/ffprobe.c b/fftools/ffprobe.c
> > index c44297c1fa..63eb9b32ae 100644
> > --- a/fftools/ffprobe.c
> > +++ b/fftools/ffprobe.c
> > @@ -1934,6 +1934,10 @@ static void print_dovi_metadata(WriterContext *w, const AVDOVIMetadata *dovi)
> >              break;
> >          }
> >
> > +        if (mapping->nlq_method_idc != AV_DOVI_NLQ_NONE) {
> > +            print_list_fmt("nlq_pivots", "%"PRIu16, 2, mapping->nlq_pivots[idx]);
> > +        }
> > +
> >          print_int("num_x_partitions",          mapping->num_x_partitions);
> >          print_int("num_y_partitions",          mapping->num_y_partitions);
> >
> > diff --git a/libavcodec/dovi_rpu.c b/libavcodec/dovi_rpu.c
> > index a87562c8a3..17837eb845 100644
> > --- a/libavcodec/dovi_rpu.c
> > +++ b/libavcodec/dovi_rpu.c
> > @@ -315,7 +315,14 @@ int ff_dovi_rpu_parse(DOVIContext *s, const uint8_t *rpu, size_t rpu_size)
> >          }
> >
> >          if (use_nlq) {
> > +            int nlq_pivot = 0;
> >              vdr->mapping.nlq_method_idc = get_bits(gb, 3);
> > +
> > +            for (int i = 0; i < 2; i++) {
> > +                nlq_pivot += get_bits(gb, hdr->bl_bit_depth);
> > +                vdr->mapping.nlq_pivots[i] = av_clip_uint16(nlq_pivot);
> > +            }
> > +
> >              /**
> >               * The patent mentions another legal value, NLQ_MU_LAW, but it's
> >               * not documented anywhere how to parse or apply that type of NLQ.
> > diff --git a/libavfilter/vf_showinfo.c b/libavfilter/vf_showinfo.c
> > index 12d39310ef..2148d202b1 100644
> > --- a/libavfilter/vf_showinfo.c
> > +++ b/libavfilter/vf_showinfo.c
> > @@ -543,6 +543,14 @@ static void dump_dovi_metadata(AVFilterContext *ctx, const AVFrameSideData *sd)
> >      av_log(ctx, AV_LOG_INFO, "mapping_color_space=%"PRIu8"; ", mapping->mapping_color_space);
> >      av_log(ctx, AV_LOG_INFO, "mapping_chroma_format_idc=%"PRIu8"; ", mapping->mapping_chroma_format_idc);
> >      av_log(ctx, AV_LOG_INFO, "nlq_method_idc=%d; ", (int) mapping->nlq_method_idc);
> > +
> > +    if (mapping->nlq_method_idc != AV_DOVI_NLQ_NONE) {
> > +        av_log(ctx, AV_LOG_INFO, "nlq_pivots={ ");
> > +        for (int i = 0; i < 2; i++)
> > +            av_log(ctx, AV_LOG_INFO, "%"PRIu16" ", mapping->nlq_pivots[i]);
> > +        av_log(ctx, AV_LOG_INFO, "}; ");
> > +    }
> > +
> >      av_log(ctx, AV_LOG_INFO, "num_x_partitions=%"PRIu32"; ", mapping->num_x_partitions);
> >      av_log(ctx, AV_LOG_INFO, "num_y_partitions=%"PRIu32"\n", mapping->num_y_partitions);
> >
> > diff --git a/libavutil/dovi_meta.h b/libavutil/dovi_meta.h
> > index 3d11e02bff..c7c5ba721f 100644
> > --- a/libavutil/dovi_meta.h
> > +++ b/libavutil/dovi_meta.h
> > @@ -144,6 +144,7 @@ typedef struct AVDOVIDataMapping {
> >
> >      /* Non-linear inverse quantization */
> >      enum AVDOVINLQMethod nlq_method_idc;
> > +    uint16_t nlq_pivots[2]; /* nlq_pred_pivot_value */
> >      uint32_t num_x_partitions;
> >      uint32_t num_y_partitions;
> >      AVDOVINLQParams nlq[3]; /* per component */
>
> This breaks ABI. New fields must be added at the end.

Thanks. Fixed in v2:
https://ffmpeg.org/pipermail/ffmpeg-devel/2022-June/297723.html

>
> - Andreas
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