wineqtdecoder: Always pass non-NULL preferred allocator to IAsyncReader::RequestAllocator.

[Andrew Eikum]

Signed-off-by: Andrew Eikum <aeikum at codeweavers.com>

On Sun, Nov 20, 2016 at 03:33:19PM +0900, Akihiro Sagawa wrote:
> Here is a patch for wineqtdecoder.
> Andrew, could you try to compile-test it before signed-off?
> Thanks in advance.
> 
> Signed-off-by: Akihiro Sagawa <sagawa.aki at gmail.com>
> ---
>  dlls/wineqtdecoder/qtsplitter.c | 13 ++++++++++++-
>  1 file changed, 12 insertions(+), 1 deletion(-)
> 

> diff --git a/dlls/wineqtdecoder/qtsplitter.c b/dlls/wineqtdecoder/qtsplitter.c
> index 4e12242..1d5b808 100644
> --- a/dlls/wineqtdecoder/qtsplitter.c
> +++ b/dlls/wineqtdecoder/qtsplitter.c
> @@ -1101,6 +1101,7 @@ static HRESULT WINAPI QTInPin_ReceiveConnection(IPin *iface, IPin *pReceivePin,
>      HRESULT hr = S_OK;
>      ALLOCATOR_PROPERTIES props;
>      QTInPin *This = impl_from_IPin(iface);
> +    IMemAllocator *pAlloc;
>  
>      TRACE("(%p/%p)->(%p, %p)\n", This, iface, pReceivePin, pmt);
>  
> @@ -1150,8 +1151,18 @@ static HRESULT WINAPI QTInPin_ReceiveConnection(IPin *iface, IPin *pReceivePin,
>      props.cbAlign = 1;
>      props.cbBuffer = impl_from_IBaseFilter(This->pin.pinInfo.pFilter)->outputSize + props.cbAlign;
>      props.cbPrefix = 0;
> +    hr = CoCreateInstance(&CLSID_MemoryAllocator, NULL, CLSCTX_INPROC,
> +                          &IID_IMemAllocator, (LPVOID *)&pAlloc);
> +    if (SUCCEEDED(hr))
> +    {
> +        /* A certain IAsyncReader::RequestAllocator expects to be passed
> +           non-NULL preferred allocator */
> +        hr = IAsyncReader_RequestAllocator(This->pReader, pAlloc, &props, &This->pAlloc);
> +        if (FAILED(hr))
> +            WARN("Can't get an allocator, got %08x\n", hr);
> +        IMemAllocator_Release(pAlloc);
> +    }
>  
> -    hr = IAsyncReader_RequestAllocator(This->pReader, NULL, &props, &This->pAlloc);
>      if (SUCCEEDED(hr))
>      {
>          CopyMediaType(&This->pin.mtCurrent, pmt);