DirectShow: Fix video and audio probes in media player

Added using ICaptureGraphBuilder2 to connect source filter and sample
grabber to probe video and audio buffers.
The capture graph builder can automatically add some intermediate filters as needed.

Video buffers are always requested in ARGB32 format.

Task-number: QTBUG-71819
Change-Id: I7382635758ba3bd76c8806cabd0895c67072be6c
Reviewed-by: Andy Shaw <andy.shaw@qt.io>
Reviewed-by: Maurice Kalinowski <maurice.kalinowski@qt.io>
Reviewed-by: Oliver Wolff <oliver.wolff@qt.io>

1 files changed, 4 insertions, 2 deletions

diff --git a/src/plugins/directshow/common/directshowutils.cpp b/src/plugins/directshow/common/directshowutils.cpp
index 8f3f321e7..d1c1d42ab 100644
--- a/src/plugins/directshow/common/directshowutils.cpp
+++ b/src/plugins/directshow/common/directshowutils.cpp
@@ -56,8 +56,10 @@ bool DirectShowUtils::isPinConnected(IPin *pin, HRESULT *hrOut)
         hrOut = &hr;
 
     *hrOut = pin->ConnectedTo(&connectedPin);
-    if (*hrOut == VFW_E_NOT_CONNECTED) // Not an error in this case
+    if (*hrOut == VFW_E_NOT_CONNECTED) { // Not an error in this case
         *hrOut = S_OK;
+        return false;
+    }
 
     if (FAILED(*hrOut)) {
         qCDebug(qtDirectShowPlugin, "Querying pin connection failed!");
@@ -282,7 +284,7 @@ bool DirectShowUtils::connectFilters(IGraphBuilder *graph,
 
     // Try to connect to the upstream filter first.
     if (findAndConnect(upstreamFilter))
-        return false;
+        return true;
 
     const auto getFilters = [graph, hrOut]() -> IEnumFilters * {
         IEnumFilters *f = nullptr;