Function av_opt_set_array

libavutil/opt.c:2287–2472

}

int av_opt_set_array(void *obj, const char *name, int search_flags,
                     unsigned int start_elem, unsigned int nb_elems,
                     enum AVOptionType val_type, const void *val)
{
    const size_t elem_size_val = opt_type_desc[TYPE_BASE(val_type)].size;

    const AVOption *o;
    const AVOptionArrayDef *arr;
    void *target_obj;

    void *parray;
    void *new_elems;
    unsigned *array_size, new_size;
    size_t elem_size;

    int ret = 0;

    ret = opt_set_init(obj, name, search_flags, 0, &target_obj, &o, &parray);
    if (ret < 0)
        return ret;

    if (!(o->type & AV_OPT_TYPE_FLAG_ARRAY) ||
        (val_type & AV_OPT_TYPE_FLAG_ARRAY))
        return AVERROR(EINVAL);

    arr        = o->default_val.arr;
    array_size = opt_array_pcount(parray);
    elem_size  = opt_type_desc[TYPE_BASE(o->type)].size;

    if (start_elem > *array_size)
        return AVERROR(EINVAL);

    // compute new array size
    if (!val) {
        if (*array_size - start_elem < nb_elems)
            return AVERROR(EINVAL);

        new_size = *array_size - nb_elems;
    } else if (search_flags & AV_OPT_ARRAY_REPLACE) {
        if (start_elem >= UINT_MAX - nb_elems)
            return AVERROR(EINVAL);

        new_size = FFMAX(*array_size, start_elem + nb_elems);
    } else {
        if (nb_elems >= UINT_MAX - *array_size)
            return AVERROR(EINVAL);

        new_size = *array_size + nb_elems;
    }

    if (arr &&
        ((arr->size_max && new_size > arr->size_max) ||
         (arr->size_min && new_size < arr->size_min)))
        return AVERROR(EINVAL);

    // desired operation is shrinking the array
    if (!val) {
        void *array = *(void**)parray;