[PATCH] mf/session: Do not drop pending commands when clearing current presentation.

[Nikolay Sivov]

Calling Start() short after SetTopology() has a good chance of getting lost,
because clearing logic will drop all pending commands. This is easy to reproduce
with IMFPMediaPlayer, which works reliably on Windows.

Signed-off-by: Nikolay Sivov <nsivov(a)codeweavers.com>
---
 dlls/mf/session.c | 21 +++++++++++++--------
 1 file changed, 13 insertions(+), 8 deletions(-)

diff --git a/dlls/mf/session.c b/dlls/mf/session.c
index 925a8c93d20..41caf02d059 100644
--- a/dlls/mf/session.c
+++ b/dlls/mf/session.c
@@ -855,12 +855,22 @@ static void session_shutdown_current_topology(struct media_session *session)
     }
 }
 
+static void session_clear_command_list(struct media_session *session)
+{
+    struct session_op *op, *op2;
+
+    LIST_FOR_EACH_ENTRY_SAFE(op, op2, &session->commands, struct session_op, entry)
+    {
+        list_remove(&op->entry);
+        IUnknown_Release(&op->IUnknown_iface);
+    }
+}
+
 static void session_clear_presentation(struct media_session *session)
 {
     struct media_source *source, *source2;
     struct media_sink *sink, *sink2;
     struct topo_node *node, *node2;
-    struct session_op *op, *op2;
 
     session_shutdown_current_topology(session);
 
@@ -895,12 +905,6 @@ static void session_clear_presentation(struct media_session *session)
             IMFMediaEventGenerator_Release(sink->event_generator);
         heap_free(sink);
     }
-
-    LIST_FOR_EACH_ENTRY_SAFE(op, op2, &session->commands, struct session_op, entry)
-    {
-        list_remove(&op->entry);
-        IUnknown_Release(&op->IUnknown_iface);
-    }
 }
 
 static struct topo_node *session_get_node_by_id(const struct media_session *session, TOPOID id)
@@ -1730,6 +1734,7 @@ static ULONG WINAPI mfsession_Release(IMFMediaSession *iface)
     {
         session_clear_topologies(session);
         session_clear_presentation(session);
+        session_clear_command_list(session);
         if (session->presentation.current_topology)
             IMFTopology_Release(session->presentation.current_topology);
         if (session->event_queue)
@@ -1847,7 +1852,6 @@ static HRESULT WINAPI mfsession_Start(IMFMediaSession *iface, const GUID *format
         hr = session_submit_command(session, op);
 
     IUnknown_Release(&op->IUnknown_iface);
-
     return hr;
 }
 
@@ -1896,6 +1900,7 @@ static HRESULT WINAPI mfsession_Shutdown(IMFMediaSession *iface)
         IMFPresentationClock_Release(session->clock);
         session->clock = NULL;
         session_clear_presentation(session);
+        session_clear_command_list(session);
     }
     LeaveCriticalSection(&session->cs);
 
-- 
2.30.2