Function unsharp_init

libhb/unsharp.c:181–272

    }                                                 \

static int unsharp_init(hb_filter_object_t *filter,
                        hb_filter_init_t   *init)
{
    filter->private_data = calloc(sizeof(struct hb_filter_private_s), 1);
    if (filter->private_data == NULL)
    {
        hb_error("Unsharp calloc failed");
        return -1;
    }
    hb_filter_private_t * pv = filter->private_data;

    pv->input = *init;

    const AVPixFmtDescriptor *desc = av_pix_fmt_desc_get(init->pix_fmt);
    pv->depth = desc->comp[0].depth;

    // Mark parameters unset
    for (int c = 0; c < 3; c++)
    {
        pv->plane_ctx[c].strength = -1;
        pv->plane_ctx[c].size     = -1;
    }

    // Read user parameters
    if (filter->settings != NULL)
    {
        hb_dict_t * dict = filter->settings;
        hb_dict_extract_double(&pv->plane_ctx[0].strength, dict, "y-strength");
        hb_dict_extract_int(&pv->plane_ctx[0].size,        dict, "y-size");

        hb_dict_extract_double(&pv->plane_ctx[1].strength, dict, "cb-strength");
        hb_dict_extract_int(&pv->plane_ctx[1].size,        dict, "cb-size");

        hb_dict_extract_double(&pv->plane_ctx[2].strength, dict, "cr-strength");
        hb_dict_extract_int(&pv->plane_ctx[2].size,        dict, "cr-size");
    }

    // Cascade values
    // Cr not set; inherit Cb. Cb not set; inherit Y. Y not set; defaults.
    for (int c = 1; c < 3; c++)
    {
        unsharp_plane_context_t * prev_ctx = &pv->plane_ctx[c - 1];
        unsharp_plane_context_t * ctx      = &pv->plane_ctx[c];

        if (ctx->strength == -1) ctx->strength = prev_ctx->strength;
        if (ctx->size     == -1) ctx->size     = prev_ctx->size;
    }

    for (int c = 0; c < 3; c++)
    {
        unsharp_plane_context_t * ctx = &pv->plane_ctx[c];

        ctx->width = init->geometry.width;
        ctx->pix_fmt = init->pix_fmt;
        ctx->bps = pv->depth > 8 ? 2 : 1;
        ctx->max_value = (1 << pv->depth) - 1;

        // Replace unset values with defaults