diff --git a/services/audioflinger/PlaybackTracks.h b/services/audioflinger/PlaybackTracks.h
index 84758a4..70bab6a 100644
--- a/services/audioflinger/PlaybackTracks.h
+++ b/services/audioflinger/PlaybackTracks.h
@@ -97,7 +97,8 @@
                                 float speed = 1.0f,
                                 bool isSpatialized = false,
                                 bool isBitPerfect = false,
-                                float volume = 0.0f);
+                                float volume = 0.0f,
+                                bool muted = false);
     ~Track() override;
     status_t initCheck() const final;
     void appendDumpHeader(String8& result) const final;
@@ -226,7 +227,9 @@
 
     // VolumePortInterface implementation
     void setPortVolume(float volume) override;
+    void setPortMute(bool muted) override;
     float getPortVolume() const override { return mVolume; }
+    bool getPortMute() const override { return mMuteState.load().muteFromPortVolume; }
 
 protected:
 
@@ -410,9 +413,9 @@
     // TODO: replace PersistableBundle with own struct
     // access these two variables only when holding player thread lock.
     std::unique_ptr<os::PersistableBundle> mMuteEventExtras;
-    mute_state_t        mMuteState;
-    bool                mInternalMute = false;
-    std::atomic<float> mVolume = 0.0f;
+    std::atomic<mute_state_t> mMuteState;
+    bool                      mInternalMute = false;
+    std::atomic<float>        mVolume = 0.0f;
 };  // end of Track
 
 
@@ -510,7 +513,8 @@
                                                                     *  the lowest possible latency
                                                                     *  even if it might glitch. */
                                    float speed = 1.0f,
-                                   float volume = 1.0f);
+                                   float volume = 1.0f,
+                                   bool muted = false);
     ~PatchTrack() override;
 
     size_t framesReady() const final;