Function opt_set_array

libavutil/opt.c:756–833

}

static int opt_set_array(void *obj, void *target_obj, const AVOption *o,
                         const char *val, void *dst)
{
    const AVOptionArrayDef *arr = o->default_val.arr;
    const size_t      elem_size = opt_type_desc[TYPE_BASE(o->type)].size;
    const uint8_t           sep = opt_array_sep(o);
    uint8_t                *str = NULL;

    void       *elems = NULL;
    unsigned nb_elems = 0;
    int ret;

    if (val && *val) {
        str = av_malloc(strlen(val) + 1);
        if (!str)
            return AVERROR(ENOMEM);
    }

    // split and unescape the string
    while (val && *val) {
        uint8_t *p = str;
        void *tmp;

        if (arr && arr->size_max && nb_elems >= arr->size_max) {
            av_log(obj, AV_LOG_ERROR,
                   "Cannot assign more than %u elements to array option %s\n",
                   arr->size_max, o->name);
            ret = AVERROR(EINVAL);
            goto fail;
        }

        for (; *val; val++, p++) {
            if (*val == '\\' && val[1])
                val++;
            else if (*val == sep) {
                val++;
                break;
            }
            *p = *val;
        }
        *p = 0;

        tmp = av_realloc_array(elems, nb_elems + 1, elem_size);
        if (!tmp) {
            ret = AVERROR(ENOMEM);
            goto fail;
        }
        elems = tmp;

        tmp = opt_array_pelem(o, elems, nb_elems);
        memset(tmp, 0, elem_size);

        ret = opt_set_elem(obj, target_obj, o, str, tmp);
        if (ret < 0)
            goto fail;
        nb_elems++;
    }
    av_freep(&str);