diff --git a/audio/7.1/Android.bp b/audio/7.1/Android.bp
index d0d96b6..52980e2 100644
--- a/audio/7.1/Android.bp
+++ b/audio/7.1/Android.bp
@@ -13,11 +13,13 @@
     name: "android.hardware.audio@7.1",
     root: "android.hardware",
     srcs: [
+        "types.hal",
         "IDevice.hal",
         "IDevicesFactory.hal",
         "IPrimaryDevice.hal",
         "IStreamIn.hal",
         "IStreamOut.hal",
+        "IStreamOutLatencyModeCallback.hal",
     ],
     interfaces: [
         "android.hardware.audio@7.0",
diff --git a/audio/7.1/IStreamOut.hal b/audio/7.1/IStreamOut.hal
index 092a9a0..b2013cf 100644
--- a/audio/7.1/IStreamOut.hal
+++ b/audio/7.1/IStreamOut.hal
@@ -16,7 +16,54 @@
 
 package android.hardware.audio@7.1;
 
+import @7.0::Result;
 import @7.0::IStreamOut;
 
+import IStreamOutLatencyModeCallback;
+
 interface IStreamOut extends @7.0::IStreamOut {
+    /**
+     * Indicates the requested latency mode for this output stream.
+     *
+     * The requested mode can be one of the modes returned by
+     * getRecommendedLatencyModes() API.
+     *
+     * Optional method.
+     * Mandated only on specific spatial audio streams indicated by
+     * AUDIO_OUTPUT_FLAG_SPATIALIZER flag if they can be routed to a BT classic sink.
+     *
+     * @return retval operation completion status.
+     */
+    setLatencyMode(LatencyMode mode) generates (Result retval);
+
+    /**
+     * Indicates which latency modes are currently supported on this output stream.
+     * If the transport protocol (e.g Bluetooth A2DP) used by this output stream to reach
+     * the output device supports variable latency modes, the HAL indicates which
+     * modes are currently supported.
+     * The framework can then call setLatencyMode() with one of the supported modes to select
+     * the desired operation mode.
+     *
+     * Optional method.
+     * Mandated only on specific spatial audio streams indicated by
+     * AUDIO_OUTPUT_FLAG_SPATIALIZER flag if they can be routed to a BT classic sink.
+     *
+     * @return retval operation completion status.
+     * @return modes currrently supported latency modes.
+     */
+    getRecommendedLatencyModes() generates (Result retval, vec<LatencyMode> modes);
+
+    /**
+     * Set the callback interface for notifying changes in supported latency modes.
+     *
+     * Calling this method with a null pointer will result in releasing
+     * the callback.
+     *
+     * Optional method.
+     * Mandated only on specific spatial audio streams indicated by
+     * AUDIO_OUTPUT_FLAG_SPATIALIZER flag if they can be routed to a BT classic sink.
+     *
+     * @return retval operation completion status.
+     */
+    setLatencyModeCallback(IStreamOutLatencyModeCallback callback) generates (Result retval);
 };
diff --git a/audio/7.1/IStreamOutLatencyModeCallback.hal b/audio/7.1/IStreamOutLatencyModeCallback.hal
new file mode 100644
index 0000000..45b453f
--- /dev/null
+++ b/audio/7.1/IStreamOutLatencyModeCallback.hal
@@ -0,0 +1,28 @@
+/*
+ * Copyright (C) 2022 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+
+package android.hardware.audio@7.1;
+
+/**
+ * Callback interface for output stream variable latency mode feature.
+ */
+interface IStreamOutLatencyModeCallback {
+    /**
+     * Called with the new list of supported latency modes when a change occurs.
+     */
+    oneway onRecommendedLatencyModeChanged(vec<LatencyMode> modes);
+};
diff --git a/audio/7.1/types.hal b/audio/7.1/types.hal
new file mode 100644
index 0000000..9d8ee4d
--- /dev/null
+++ b/audio/7.1/types.hal
@@ -0,0 +1,30 @@
+/*
+ * Copyright (C) 2022 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package android.hardware.audio@7.1;
+
+/**
+ * Latency modes used for the variable latency feature on output streams.
+ * Used by setLatencyMode() and getRecommendedLatencyModes() methods.
+ */
+
+@export(name="audio_latency_mode_t", value_prefix="AUDIO_LATENCY_MODE_")
+enum LatencyMode : int32_t {
+    /** No specific constraint on the latency */
+    FREE = 0,
+    /** A relatively low latency compatible with head tracking operation (e.g less than 100ms) */
+    LOW = 1,
+};