Function ff_parse_opts_from_query_string

libavformat/utils.c:636–686

}

int ff_parse_opts_from_query_string(void *obj, const char *str, int allow_unknown)
{
    const AVOption *opt;
    char optval[512];
    int ret;

    if (*str == '?')
        str++;
    while (*str) {
        size_t len = strcspn(str, "=&");
        opt = find_opt(obj, str, len);
        if (!opt) {
            if (!allow_unknown) {
                av_log(obj, AV_LOG_ERROR, "Query string option '%.*s' does not exist\n", (int)len, str);
                return AVERROR_OPTION_NOT_FOUND;
            }
            av_log(obj, AV_LOG_VERBOSE, "Ignoring unknown query string option '%.*s'\n", (int)len, str);
        }
        str += len;
        if (!opt) {
            len = strcspn(str, "&");
            str += len;
        } else if (*str == '&' || *str == '\0') {
            /* Check for bool options without value, e.g. "?verify".
             * Unfortunately "listen" is a tri-state INT for some protocols so
             * we also have to allow that for backward compatibility. */
            if (opt->type != AV_OPT_TYPE_BOOL && strcmp(opt->name, "listen")) {
                av_log(obj, AV_LOG_ERROR, "Non-bool query string option '%s' has no value\n", opt->name);
                return AVERROR(EINVAL);
            }
            ret = av_opt_set_int(obj, opt->name, 1, 0);
            if (ret < 0)
                return ret;
        } else {
            av_assert2(*str == '=');
            str++;
            len = strcspn(str, "&");
            if (ff_urldecode_len(optval, sizeof(optval), str, len, 1) < 0) {
                av_log(obj, AV_LOG_ERROR, "Query string option '%s' value is too long\n", opt->name);
                return AVERROR(EINVAL);
            }
            ret = av_opt_set(obj, opt->name, optval, 0);
            if (ret < 0)
                return ret;
            str += len;
        }
        if (*str)
            str++;
    }
    return 0;
}