[PATCH v9 4/5] mf: Support seeking while a session is running.

[Zhiyi Zhang]

From: Zhiyi Zhang

---
 dlls/mf/session.c | 49 +++++++++++++++++++++++++++++++++++++++++++++--
 1 file changed, 47 insertions(+), 2 deletions(-)

diff --git a/dlls/mf/session.c b/dlls/mf/session.c
index ca5e367ec44..42459d1cc5c 100644
--- a/dlls/mf/session.c
+++ b/dlls/mf/session.c
@@ -91,6 +91,7 @@ enum session_state
 {
     SESSION_STATE_STOPPED = 0,
     SESSION_STATE_STARTING_SOURCES,
+    SESSION_STATE_SEEKING_SOURCES,
     SESSION_STATE_PREROLLING_SINKS,
     SESSION_STATE_STARTING_SINKS,
     SESSION_STATE_STARTED,
@@ -110,6 +111,7 @@ enum object_state
     OBJ_STATE_STARTED,
     OBJ_STATE_PAUSED,
     OBJ_STATE_PREROLLED,
+    OBJ_STATE_SEEKING,
     OBJ_STATE_INVALID,
 };

@@ -929,6 +931,7 @@ static void session_start(struct media_session *session, const GUID *time_format
 {
     struct media_source *source;
     struct topo_node *topo_node;
+    MFTIME duration;
     HRESULT hr;
     UINT i;

@@ -981,8 +984,42 @@ static void session_start(struct media_session *session, const GUID *time_format
             session->state = SESSION_STATE_STARTING_SOURCES;
             break;
         case SESSION_STATE_STARTED:
-            FIXME("Seeking is not implemented.\n");
-            session_command_complete(session);
+            session->presentation.time_format = *time_format;
+            session->presentation.start_position.vt = VT_EMPTY;
+            PropVariantCopy(&session->presentation.start_position, start_position);
+
+            LIST_FOR_EACH_ENTRY(source, &session->presentation.sources, struct media_source, entry)
+            {
+                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_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;
+                }
+
+                if (FAILED(hr = IMFMediaSource_Start(source->source, source->pd, &GUID_NULL, start_position)))
+                {
+                    WARN("Failed to start 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)
+            {
+                source->state = OBJ_STATE_SEEKING;
+            }
+            session->state = SESSION_STATE_SEEKING_SOURCES;
             break;
         default:
             session_command_complete_with_event(session, MESessionStarted, MF_E_INVALIDREQUEST, NULL);
@@ -2976,6 +3013,14 @@ static void session_set_source_object_state(struct media_session *session, IUnkn
             else if (SUCCEEDED(session_start_clock(session)))
                 session->state = SESSION_STATE_STARTING_SINKS;

+            break;
+        case SESSION_STATE_SEEKING_SOURCES:
+            if (!session_is_source_nodes_state(session, OBJ_STATE_STARTED))
+                break;
+
+            if (SUCCEEDED(session_start_clock(session)))
+                session_set_started(session);
+
             break;
         case SESSION_STATE_PAUSING_SOURCES:
             if (!session_is_source_nodes_state(session, OBJ_STATE_PAUSED))