diff --git a/services/audioflinger/AudioFlinger.h b/services/audioflinger/AudioFlinger.h
index f16a196..1441e15 100644
--- a/services/audioflinger/AudioFlinger.h
+++ b/services/audioflinger/AudioFlinger.h
@@ -24,6 +24,7 @@
 #include <chrono>
 #include <deque>
 #include <map>
+#include <numeric>
 #include <optional>
 #include <set>
 #include <string>
@@ -528,6 +529,9 @@
     class EffectChain;
 
     struct AudioStreamIn;
+    struct TeePatch;
+    using TeePatches = std::vector<TeePatch>;
+
 
     struct  stream_type_t {
         stream_type_t()
@@ -727,6 +731,11 @@
             audioHwDev(dev), stream(in), flags(flags) {}
     };
 
+    struct TeePatch {
+        sp<RecordThread::PatchRecord> patchRecord;
+        sp<PlaybackThread::PatchTrack> patchTrack;
+    };
+
     // for mAudioSessionRefs only
     struct AudioSessionRef {
         AudioSessionRef(audio_session_t sessionid, pid_t pid) :