[PATCH 1/3] qasf: Unblock DSoundRender filter by sending a preroll sample on init.

[Rémi Bernon]

From: Rémi Bernon

Wine-Bug: https://bugs.winehq.org/show_bug.cgi?id=53640
Wine-Bug: https://bugs.winehq.org/show_bug.cgi?id=53748
---
 dlls/qasf/asfreader.c | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/dlls/qasf/asfreader.c b/dlls/qasf/asfreader.c
index 4cf077e9dd3..538b4b5b377 100644
--- a/dlls/qasf/asfreader.c
+++ b/dlls/qasf/asfreader.c
@@ -451,6 +451,7 @@ static HRESULT asf_reader_init_stream(struct strmbase_filter *iface)
     {
         struct asf_stream *stream = filter->streams + i;
         IWMOutputMediaProps *props;
+        IMediaSample *sample;

stream_numbers[i] = i + 1;
         selections[i] = WMT_OFF;
@@ -493,6 +494,17 @@ static HRESULT asf_reader_init_stream(struct strmbase_filter *iface)
         }

selections[i] = WMT_ON;
+
+        /* Push a preroll sample to unblock DSoundRender filter and avoid a deadlock with renderers waiting on each other.
+         * FIXME: This should instead be done with WM Reader delivery threads.
+         */
+        if (wcsstr(stream->source.pin.name, L"Raw Audio")
+                && SUCCEEDED(hr = IMemAllocator_GetBuffer(stream->source.pAllocator, &sample, NULL, NULL, 0)))
+        {
+            IMediaSample_SetPreroll(sample, TRUE);
+            IMemInputPin_Receive(stream->source.pMemInputPin, sample);
+            IMediaSample_Release(sample);
+        }
     }

if (SUCCEEDED(hr) && FAILED(hr = IWMReaderAdvanced_SetStreamsSelected(reader_advanced,