Re: [PATCH 0/5] MR7715: Implement dynamic formats in directdraw media stream.

[Anton Baskanov (＠baskanov)]

Anton Baskanov (@baskanov) commented about dlls/amstream/ddrawstream.c:
> DWORD flags)
>  {
>      struct ddraw_stream *stream = impl_from_IMemAllocator(iface);
> +    HRESULT hr;
>
> -    return IMemAllocator_GetBuffer(stream->private_allocator, buf, start_time, end_time, flags);
> +    EnterCriticalSection(&stream->cs);
> +
> +    *buf = stream->next_sample;
> +    IMediaSample_SetTime(*buf, start_time, end_time);
> +    hr = IMemAllocator_GetBuffer(stream->private_allocator, &stream->next_sample, NULL, NULL, flags);

We can get stuck here if there only one sample available. I think it's better to just store the media type and set it when `GetBuffer()` is called.

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https://gitlab.winehq.org/wine/wine/-/merge_requests/7715#note_99685