Check file descriptor before passing it through binder calls

        return INVALID_OPERATION;

    }

    // It appears that if an invalid file descriptor is passed through

    // binder calls, the server-side of the inter-process function call

    // is skipped. As a result, the check at the server-side to catch

    // the invalid file descritpor never gets invoked. This is to workaround

    // this issue by checking the file descriptor first before passing

    // it through binder call.

    if (fd < 0) {

        LOGE("Invalid file descriptor: %d", fd);

        return BAD_VALUE;

    }

    status_t ret = mMediaRecorder->setOutputFile(fd, offset, length);

    if (OK != ret) {

        LOGV("setOutputFile failed: %d", ret);