{
    MediaDetImpl *This = (MediaDetImpl *)iface;
    IEnumPins *pins;
    IPin *pin;
    HRESULT hr;

    TRACE("(%p)\n", This);

    if (!This->splitter)
        return E_INVALIDARG;

    if (This->num_streams != -1)
    {
        *pVal = This->num_streams;
        return S_OK;
    }

    *pVal = 0;

    hr = IBaseFilter_EnumPins(This->splitter, &pins);
    if (FAILED(hr))
        return hr;

    while (IEnumPins_Next(pins, 1, &pin, NULL) == S_OK)
    {
        PIN_DIRECTION dir;
        hr = IPin_QueryDirection(pin, &dir);
        IPin_Release(pin);
        if (FAILED(hr))
        {
            IEnumPins_Release(pins);
            return hr;
        }

        if (dir == PINDIR_OUTPUT)
            ++*pVal;
    }
    IEnumPins_Release(pins);

    This->num_streams = *pVal;
    return S_OK;
}

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