[PATCH v4 3/5] mf: Add seeking support for IMFMediaSession::Start().

[Zhiyi Zhang]

From: Zhiyi Zhang

---
 dlls/mf/session.c | 53 ++++++++++++++++++++++++++++++++++++++++-------
 1 file changed, 45 insertions(+), 8 deletions(-)

diff --git a/dlls/mf/session.c b/dlls/mf/session.c
index b9b77415f61..c48e11f5910 100644
--- a/dlls/mf/session.c
+++ b/dlls/mf/session.c
@@ -110,6 +110,7 @@ enum object_state
     OBJ_STATE_STARTED,
     OBJ_STATE_PAUSED,
     OBJ_STATE_PREROLLED,
+    OBJ_STATE_SEEKING,
     OBJ_STATE_INVALID,
 };

@@ -902,9 +903,27 @@ static void session_flush_nodes(struct media_session *session)
     }
 }

+static void session_set_source_output_nodes_seeking(struct media_session *session)
+{
+    struct media_source *source;
+    struct topo_node *node;
+
+    LIST_FOR_EACH_ENTRY(source, &session->presentation.sources, struct media_source, entry)
+    {
+        source->state = OBJ_STATE_SEEKING;
+    }
+
+    LIST_FOR_EACH_ENTRY(node, &session->presentation.nodes, struct topo_node, entry)
+    {
+        if (node->type == MF_TOPOLOGY_SOURCESTREAM_NODE || node->type == MF_TOPOLOGY_OUTPUT_NODE)
+            node->state = OBJ_STATE_SEEKING;
+    }
+}
+
 static void session_start(struct media_session *session, const GUID *time_format, const PROPVARIANT *start_position)
 {
     struct media_source *source;
+    MFTIME duration;
     HRESULT hr;

switch (session->state)
@@ -920,7 +939,7 @@ static void session_start(struct media_session *session, const GUID *time_format

/* fallthrough */
         case SESSION_STATE_PAUSED:
-
+        case SESSION_STATE_STARTED:
             session->presentation.time_format = *time_format;
             session->presentation.start_position.vt = VT_EMPTY;
             PropVariantCopy(&session->presentation.start_position, start_position);
@@ -931,9 +950,32 @@ static void session_start(struct media_session *session, const GUID *time_format
                 return;
             }

+            if (session->state != SESSION_STATE_STOPPED)
+            {
+                LIST_FOR_EACH_ENTRY(source, &session->presentation.sources, struct media_source, entry)
+                {
+                    if (FAILED(hr = IMFMediaSource_Stop(source->source)))
+                    {
+                        WARN("Failed to stop media source %p, hr %#lx.\n", source->source, hr);
+                        session_command_complete_with_event(session, MESessionStarted, hr, NULL);
+                        return;
+                    }
+                }
+            }
+            session_flush_nodes(session);
+
             LIST_FOR_EACH_ENTRY(source, &session->presentation.sources, struct media_source, entry)
             {
-                if (FAILED(hr = IMFMediaSource_Start(source->source, source->pd, &GUID_NULL, start_position)))
+                hr = IMFPresentationDescriptor_GetUINT64(source->pd, &MF_PD_DURATION, (UINT64 *)&duration);
+                if (SUCCEEDED(hr) && IsEqualGUID(time_format, &GUID_NULL)
+                        && start_position->vt == VT_I8 && start_position->hVal.QuadPart > duration)
+                {
+                    WARN("Start position %s out of range, hr %#lx.\n", wine_dbgstr_longlong(start_position->hVal.QuadPart), hr);
+                    session_command_complete_with_event(session, MESessionStarted, MF_E_INVALID_POSITION, NULL);
+                    return;
+                }
+
+                if (FAILED(hr = IMFMediaSource_Start(source->source, source->pd, time_format, start_position)))
                 {
                     WARN("Failed to start media source %p, hr %#lx.\n", source->source, hr);
                     session_command_complete_with_event(session, MESessionStarted, hr, NULL);
@@ -941,12 +983,9 @@ static void session_start(struct media_session *session, const GUID *time_format
                 }
             }

+            session_set_source_output_nodes_seeking(session);
             session->state = SESSION_STATE_STARTING_SOURCES;
             break;
-        case SESSION_STATE_STARTED:
-            FIXME("Seeking is not implemented.\n");
-            session_command_complete(session);
-            break;
         default:
             session_command_complete_with_event(session, MESessionStarted, MF_E_INVALIDREQUEST, NULL);
             break;
@@ -3653,8 +3692,6 @@ static HRESULT WINAPI session_events_callback_Invoke(IMFAsyncCallback *iface, IM
     {
         case MESourceSeeked:
         case MEStreamSeeked:
-            FIXME("Source/stream seeking, semi-stub!\n");
-            /* fallthrough */
         case MESourceStarted:
         case MESourcePaused:
         case MESourceStopped: