diff --git a/automotive/audiocontrol/1.0/IAudioControl.hal b/automotive/audiocontrol/1.0/IAudioControl.hal
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+++ b/automotive/audiocontrol/1.0/IAudioControl.hal
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+/*
+ * Copyright (C) 2017 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.automotive.audiocontrol@1.0;
+
+import IAudioControlCallback;
+
+
+/**
+ * Interacts with the car's audio subsystem to manage audio sources and volumes
+ */
+interface IAudioControl {
+
+    /**
+     * Registers the required callback object so that we can be notified when the state
+     * of the car's audio system changes. This call must be made when the interface is
+     * initialized.
+     */
+    setCallback(IAudioControlCallback notificationObject)
+        generates (AudioResult result);
+
+
+    /**
+     * Called at startup once per context to get the mapping from ContextNumber to
+     * busAddress. This lets the car tell the framework to which physical output stream
+     * each context should be routed.
+     *
+     * For every context, a valid bus number (0 - num busses-1) must be returned. If an
+     * unrecognized contextNumber is encountered, then -1 shall be returned.
+     *
+     * Any context for which an invalid busNumber is returned must be routed to bus 0.
+     */
+    getBusForContext(uint32_t contextNumber)
+        generates (int32_t busNumber);
+
+
+    /**
+     * Control the right/left balance setting of the car speakers.
+     *
+     * This is intended to shift the speaker volume toward the right (+) or left (-) side of
+     * the car. 0.0 means "centered". +1.0 means fully right. -1.0 means fully left.
+     *
+     * A value outside the range -1 to 1 must be clamped by the implementation to the -1 to 1
+     * range.
+     */
+    oneway setBalanceTowardRight(float value);
+
+
+    /**
+     * Control the fore/aft fade setting of the car speakers.
+     *
+     * This is intended to shift the speaker volume toward the front (+) or back (-) of the car.
+     * 0.0 means "centered". +1.0 means fully forward. -1.0 means fully rearward.
+     *
+     * A value outside the range -1 to 1 must be clamped by the implementation to the -1 to 1
+     * range.
+     */
+    oneway setFadeTowardFront(float value);
+};
+