[FFmpeg-devel] [PATCH 1/2] Support HDR dynamic metdata (HDR10+) in HEVC decoder.

[Mohammad Izadi]

You mean a pointer in HEVCSEIDynamicHDRPlus, not in HEVCSEIContentLight?
--
Best,
Mohammad


On Thu, Jan 3, 2019 at 5:08 PM Rostislav Pehlivanov <atomnuker at gmail.com>
wrote:

> On Thu, 3 Jan 2019 at 20:13, Mohammad Izadi <moh.izadi at gmail.com> wrote:
>
> >
> >  /**
> > @@ -94,6 +95,50 @@ typedef struct HEVCSEIMasteringDisplay {
> >      uint32_t min_luminance;
> >  } HEVCSEIMasteringDisplay;
> >
> > +typedef struct HEVCSEIDynamicHDRPlus{
> > +    int present;
> > +    uint8_t itu_t_t35_country_code;
> > +    uint8_t application_version;
> > +    uint8_t num_windows;
> > +    struct {
> > +        AVRational window_upper_left_corner_x;
> > +        AVRational window_upper_left_corner_y;
> > +        AVRational window_lower_right_corner_x;
> > +        AVRational window_lower_right_corner_y;
> > +        uint16_t center_of_ellipse_x;
> > +        uint16_t center_of_ellipse_y;
> > +        uint8_t rotation_angle;
> > +        uint16_t semimajor_axis_internal_ellipse;
> > +        uint16_t semimajor_axis_external_ellipse;
> > +        uint16_t semiminor_axis_external_ellipse;
> > +        uint8_t overlap_process_option;
> > +        AVRational maxscl[3];
> > +        AVRational average_maxrgb;
> > +        uint8_t num_distribution_maxrgb_percentiles;
> > +        struct {
> > +            uint8_t percentage;
> > +            AVRational percentile;
> > +        } distribution_maxrgb[15];
> > +        AVRational fraction_bright_pixels;
> > +        uint8_t tone_mapping_flag;
> > +        AVRational knee_point_x;
> > +        AVRational knee_point_y;
> > +        uint8_t num_bezier_curve_anchors;
> > +        AVRational bezier_curve_anchors[15];
> > +        uint8_t color_saturation_mapping_flag;
> > +        AVRational color_saturation_weight;
> > +    } params[3];
> > +    AVRational targeted_system_display_maximum_luminance;
> > +    uint8_t targeted_system_display_actual_peak_luminance_flag;
> > +    uint8_t num_rows_targeted_system_display_actual_peak_luminance;
> > +    uint8_t num_cols_targeted_system_display_actual_peak_luminance;
> > +    AVRational targeted_system_display_actual_peak_luminance[25][25];
> > +    uint8_t mastering_display_actual_peak_luminance_flag;
> > +    uint8_t num_rows_mastering_display_actual_peak_luminance;
> > +    uint8_t num_cols_mastering_display_actual_peak_luminance;
> > +    AVRational mastering_display_actual_peak_luminance[25][25];
> > +} HEVCSEIDynamicHDRPlus;
> > +
> >
>
> There's no reason to create a new struct for this if all you're going to do
> is to copy it over and over to new frames.
> What you can do is this: on every SEI containing this thing just allocate a
> AVDynamicHDRPlus struct via av_dynamic_hdr_plus_alloc, wrap it as an
> AVBufferRef via av_buffer_create, populate it, put it as a pointer in
> HEVCSEIContentLight and then on every frame just add it to the frame via
> av_frame_new_side_data_from_buf. If a new SEI is received unref your
> pointer in HEVCSEIDynamicHDRPlus and repeat by allocating a new struct,
> wrapping it as a buffer, populating it, etc.
> I figure the only reason this wasn't done with other metadata was because
> they were much smaller and because av_frame_new_side_data_from_buf didn't
> exist until recently.
>
>
> +            av_log(s->avctx, AV_LOG_DEBUG, ")");
> > +            if (metadata->params[w].color_saturation_mapping_flag) {
> > +                av_log(s->avctx, AV_LOG_DEBUG,
> > +                       " color_saturation_weight=%5.4f",
> > +
> >  av_q2d(metadata->params[w].color_saturation_weight));
> > +            }
> > +            av_log(s->avctx, AV_LOG_DEBUG, "}\n");
> > +        }
> > +        av_log(s->avctx, AV_LOG_DEBUG,
> > +               "} End of HDR10+ (SMPTE 2094-40)\n");
> > +    }
> >
>
> Don't spam stuff like than in the debug log, especially not on every single
> frame. Tools exist to print side data so just don't.
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