On Sun, 13 Jul 2025 03:51:10 +0900 Lynne <d...@lynne.ee> wrote:
> This makes it possible to apply Adobe .cube files to inputs.
> ---
> doc/filters.texi | 30 ++++++++++++++++++++++++++++++
> libavfilter/vf_libplacebo.c | 36 ++++++++++++++++++++++++++++++++++++
> 2 files changed, 66 insertions(+)
>
> diff --git a/doc/filters.texi b/doc/filters.texi
> index ed2956fe75..13add0ff01 100644
> --- a/doc/filters.texi
> +++ b/doc/filters.texi
> @@ -16321,6 +16321,36 @@ Render frames with rounded corners. The value, given
> as a float ranging from
> square to fully circular. In other words, it gives the radius divided by half
> the smaller side length. Defaults to @code{0.0}.
>
> +@item lut
> +Specifies a custom LUT (in Adobe .cube format) to apply to the colors
> +as part of color conversion. The exact interpretation depends on the value
> +of @option{lut_type}.
> +
> +@item lut_type
> +Controls the interpretation of color values fed to and from the LUT
> +specified as @option{lut}. Valid values are:
> +
> +@table @samp
> +@item auto
> +Chooses the interpretation of the LUT automatically from tagged
> +metadata, and otherwise falls back to @samp{native}. (Default)
> +
> +@item native
> +Applied to raw image contents in its native RGB colorspace (non-linear
> +light), before conversion to the output color space.
> +
> +@item normalized
> +Applied to the normalized RGB image contents, in linear light, before
> +conversion to the output color space.
> +
> +@item conversion
> +Fully replaces the conversion from the image color space to the output
> +color space. If such a LUT is present, it has the highest priority, and
> +overrides any ICC profiles, as well as options related to tone mapping
> +and output colorimetry (@option{color_primaries}, @option{color_trc}).
> +
> +@end table
> +
> @item extra_opts
> Pass extra libplacebo internal configuration options. These can be specified
> as a list of @var{key}=@var{value} pairs separated by ':'. The following
> example
> diff --git a/libavfilter/vf_libplacebo.c b/libavfilter/vf_libplacebo.c
> index 475030c80d..cbdbe3e665 100644
> --- a/libavfilter/vf_libplacebo.c
> +++ b/libavfilter/vf_libplacebo.c
> @@ -159,6 +159,7 @@ typedef struct LibplaceboContext {
> pl_vulkan vulkan;
> pl_gpu gpu;
> pl_tex tex[4];
> + struct pl_custom_lut *lut;
>
> /* input state */
> LibplaceboInput *inputs;
> @@ -184,6 +185,8 @@ typedef struct LibplaceboContext {
> AVExpr *pos_x_pexpr, *pos_y_pexpr, *pos_w_pexpr, *pos_h_pexpr;
> float pad_crop_ratio;
> float corner_rounding;
> + char *lut_filename;
> + enum pl_lut_type lut_type;
> int force_original_aspect_ratio;
> int force_divisible_by;
> int reset_sar;
> @@ -371,6 +374,26 @@ static int find_scaler(AVFilterContext *avctx,
> return AVERROR(EINVAL);
> }
>
> +static int parse_custom_lut(LibplaceboContext *s)
> +{
> + int ret;
> + uint8_t *lutbuf;
> + size_t lutbuf_size;
> +
> + if ((ret = av_file_map(s->lut_filename, &lutbuf, &lutbuf_size, 0, s)) <
> 0) {
> + av_log(s, AV_LOG_ERROR,
> + "The LUT file '%s' could not be read: %s\n",
> + s->lut_filename, av_err2str(ret));
> + return ret;
> + }
> +
> + s->lut = pl_lut_parse_cube(s->log, lutbuf, lutbuf_size);
> + av_file_unmap(lutbuf, lutbuf_size);
> + if (!s->lut)
> + return AVERROR(EINVAL);
> + return 0;
> +}
> +
> static int update_settings(AVFilterContext *ctx)
> {
> int err = 0;
> @@ -729,6 +752,9 @@ static int init_vulkan(AVFilterContext *avctx, const
> AVVulkanDeviceContext *hwct
> RET(parse_shader(avctx, buf, buf_len));
> }
>
> + if (s->lut_filename)
> + RET(parse_custom_lut(s));
> +
> /* Initialize inputs */
> s->inputs = av_calloc(s->nb_inputs, sizeof(*s->inputs));
> if (!s->inputs)
> @@ -757,6 +783,7 @@ static void libplacebo_uninit(AVFilterContext *avctx)
> av_freep(&s->inputs);
> }
>
> + pl_lut_free(&s->lut);
> #if PL_API_VER >= 351
> pl_cache_destroy(&s->cache);
> #endif
> @@ -1005,6 +1032,8 @@ static bool map_frame(pl_gpu gpu, pl_tex *tex,
> .tex = tex,
> .map_dovi = s->apply_dovi,
> ));
> + out->lut = s->lut;
> + out->lut_type = s->lut_type;
>
> if (!s->apply_filmgrain)
> out->film_grain.type = PL_FILM_GRAIN_NONE;
> @@ -1406,6 +1435,13 @@ static const AVOption libplacebo_options[] = {
> { "pad_crop_ratio", "ratio between padding and cropping when normalizing
> SAR (0=pad, 1=crop)", OFFSET(pad_crop_ratio), AV_OPT_TYPE_FLOAT, {.dbl=0.0},
> 0.0, 1.0, DYNAMIC },
> { "fillcolor", "Background fill color", OFFSET(fillcolor),
> AV_OPT_TYPE_COLOR, {.str = "black@0"}, .flags = DYNAMIC },
> { "corner_rounding", "Corner rounding radius", OFFSET(corner_rounding),
> AV_OPT_TYPE_FLOAT, {.dbl = 0.0}, 0.0, 1.0, .flags = DYNAMIC },
> + { "lut", "Path to custom LUT file to apply", OFFSET(lut_filename),
> AV_OPT_TYPE_STRING, { .str = NULL }, .flags = STATIC },
> + { "lut_type", "Application mode of the custom LUT", OFFSET(lut_type),
> AV_OPT_TYPE_INT, { .i64 = PL_LUT_UNKNOWN }, 0, PL_LUT_CONVERSION, STATIC,
> .unit = "lut_type" },
> + { "auto", NULL, 0, AV_OPT_TYPE_CONST, {.i64 = PL_LUT_UNKNOWN }, 0,
> 0, STATIC, .unit = "lut_type" },
> + { "native", NULL, 0, AV_OPT_TYPE_CONST, {.i64 = PL_LUT_NATIVE }, 0,
> 0, STATIC, .unit = "lut_type" },
> + { "normalized", NULL, 0, AV_OPT_TYPE_CONST, {.i64 =
> PL_LUT_NORMALIZED }, 0, 0, STATIC, .unit = "lut_type" },
> + { "conversion", NULL, 0, AV_OPT_TYPE_CONST, {.i64 =
> PL_LUT_CONVERSION }, 0, 0, STATIC, .unit = "lut_type" },
> +
> { "extra_opts", "Pass extra libplacebo-specific options using a
> :-separated list of key=value pairs", OFFSET(extra_opts), AV_OPT_TYPE_DICT,
> .flags = DYNAMIC },
> #if PL_API_VER >= 351
> { "shader_cache", "Set shader cache path", OFFSET(shader_cache),
> AV_OPT_TYPE_STRING, {.str = NULL}, .flags = STATIC },
> --
> 2.50.0
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Commit LGTM.
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