winegstreamer: Clamp both timestamp and timestamp + diff to 0.

dlls/winegstreamer/gstdemux.c

@@ -1965,6 +1965,8 @@ static HRESULT WINAPI GST_QualityControl_Notify(IQualityControl *iface, IBaseFil
 {
     struct gstdemux_source *pin = impl_from_IQualityControl(iface);
     GstQOSType type = GST_QOS_TYPE_OVERFLOW;
+    GstClockTime timestamp;
+    GstClockTimeDiff diff;
     GstEvent *evt;
 
     TRACE("(%p)->(%p, { 0x%x %u %s %s })\n", pin, sender,
@@ -1974,16 +1976,23 @@ static HRESULT WINAPI GST_QualityControl_Notify(IQualityControl *iface, IBaseFil
 
     mark_wine_thread();
 
-    if (qm.Type == Flood)
-        qm.Late = 0;
-
     /* GSTQOS_TYPE_OVERFLOW is also used for buffers that arrive on time, but
      * DirectShow filters might use Famine, so check that there actually is an
      * underrun. */
     if (qm.Type == Famine && qm.Proportion > 1000)
         type = GST_QOS_TYPE_UNDERFLOW;
 
-    evt = gst_event_new_qos(type, qm.Proportion / 1000.0, qm.Late * 100, qm.TimeStamp * 100);
+    /* DirectShow filters sometimes pass negative timestamps (Audiosurf uses the
+     * current time instead of the time of the last buffer). GstClockTime is
+     * unsigned, so clamp it to 0. */
+    timestamp = max(qm.TimeStamp * 100, 0);
+
+    /* The documentation specifies that timestamp + diff must be nonnegative. */
+    diff = qm.Late * 100;
+    if (timestamp < -diff)
+        diff = -timestamp;
+
+    evt = gst_event_new_qos(type, qm.Proportion / 1000.0, diff, timestamp);
 
     if (!evt) {
         WARN("Failed to create QOS event\n");