vaapi libva va_getDriverName() returns -1 求助

x5762210

libva info: VA-API version 0.39.0
libva info: va_getDriverName() returns -1
libva info: User requested driver 'rockchip'
libva info: Trying to open /usr/lib/arm-linux-gnueabihf/dri/rockchip_drv_video.so
libva info: Found init function __vaDriverInit_0_39
libva info: va_openDriver() returns 0


      VADisplay va_dpy;
      va_status = vaInitialize(va_dpy, &major_version, &minor_version);


     VADriverContextP ctx;
     ctx = CTX(dpy);
     vaStatus = va_getDriverName(dpy, &driver_name);
    if (!ctx->override_driver_name) {
        va_infoMessage("va_getDriverName() returns %d\n", vaStatus);

        driver_name_env = getenv("LIBVA_DRIVER_NAME");
    } else if (vaStatus == VA_STATUS_SUCCESS) {
        if (driver_name)
            free(driver_name);

        driver_name = strdup(ctx->override_driver_name);
        if (!driver_name) {
            vaStatus = VA_STATUS_ERROR_ALLOCATION_FAILED;
            va_errorMessage("vaInitialize() failed with %s, out of memory\n",
                        vaErrorStr(vaStatus));
            return vaStatus;
        }
        va_infoMessage("User requested driver '%s'\n", driver_name);
    }