diff --git a/audio/effect/2.0/IEffect.hal b/audio/effect/2.0/IEffect.hal
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+/*
+ * Copyright (C) 2016 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.effect@2.0;
+
+import android.hardware.audio.common@2.0;
+import IEffectBufferProviderCallback;
+
+interface IEffect {
+    /*
+     * Initialize effect engine--all configurations return to default.
+     *
+     * @return retval operation completion status.
+     */
+    @entry
+    @callflow(next={"*"})
+    init() generates (Result retval);
+
+    /*
+     * Apply new audio parameters configurations for input and output buffers.
+     * The provider callbacks may be empty, but in this case the buffer
+     * must be provided in the EffectConfig structure.
+     *
+     * @param config configuration descriptor.
+     * @param inputBufferProvider optional buffer provider reference.
+     * @param outputBufferProvider optional buffer provider reference.
+     * @return retval operation completion status.
+     */
+    @callflow(next={"*"})
+    setConfig(EffectConfig config,
+            IEffectBufferProviderCallback inputBufferProvider,
+            IEffectBufferProviderCallback outputBufferProvider)
+            generates (Result retval);
+
+    /*
+     * Reset the effect engine. Keep configuration but resets state and buffer
+     * content.
+     */
+    @callflow(next={"*"})
+    reset();
+
+    /*
+     * Enable processing.
+     *
+     * @return retval operation completion status.
+     */
+    @callflow(next={"process"})
+    enable() generates (Result retval);
+
+    /*
+     * Disable processing.
+     *
+     * @return retval operation completion status.
+     */
+    @exit
+    disable() generates (Result retval);
+
+    /*
+     * Set the rendering device the audio output path is connected to.  The
+     * effect implementation must set EFFECT_FLAG_DEVICE_IND flag in its
+     * descriptor to receive this command when the device changes.
+     *
+     * @param device output device specification.
+     */
+    @callflow(next={"*"})
+    setDevice(AudioDevice device);
+
+    /*
+     * Set and get volume. Used by audio framework to delegate volume control to
+     * effect engine.  The effect implementation must set EFFECT_FLAG_VOLUME_IND
+     * or EFFECT_FLAG_VOLUME_CTRL flag in its descriptor to receive this command
+     * before every call to 'process' function If EFFECT_FLAG_VOLUME_CTRL flag
+     * is set in the effect descriptor, the effect engine must return the volume
+     * that should be applied before the effect is processed. The overall volume
+     * (the volume actually applied by the effect engine multiplied by the
+     * returned value) should match the value indicated in the command.
+     *
+     * @param volumes vector containing volume for each channel defined in
+     *                EffectConfig for output buffer expressed in 8.24 fixed
+     *                point format.
+     * @return result updated volume values. It is OK to receive an empty vector
+     *                as a result in which case the effect framework has
+     *                delegated volume control to another effect.
+     */
+    @callflow(next={"*"})
+    setAndGetVolume(vec<int32_t> volumes) generates (vec<int32_t> result);
+
+    /*
+     * Set the audio mode. The effect implementation must set
+     * EFFECT_FLAG_AUDIO_MODE_IND flag in its descriptor to receive this command
+     * when the audio mode changes.
+     *
+     * @param mode desired audio mode.
+     */
+    @callflow(next={"*"})
+    setAudioMode(AudioMode mode);
+
+    /*
+     * Apply new audio parameters configurations for input and output buffers of
+     * reverse stream.  An example of reverse stream is the echo reference
+     * supplied to an Acoustic Echo Canceler.
+     *
+     * @param config configuration descriptor.
+     * @param inputBufferProvider optional buffer provider reference.
+     * @param outputBufferProvider optional buffer provider reference.
+     * @return retval operation completion status.
+     */
+    @callflow(next={"*"})
+    setConfigReverse(EffectConfig config,
+            IEffectBufferProviderCallback inputBufferProvider,
+            IEffectBufferProviderCallback outputBufferProvider)
+            generates (Result retval);
+
+    /*
+     * Set the capture device the audio input path is connected to. The effect
+     * implementation must set EFFECT_FLAG_DEVICE_IND flag in its descriptor to
+     * receive this command when the device changes.
+     *
+     * @param device input device specification.
+     */
+    @callflow(next={"*"})
+    setInputDevice(AudioDevice device);
+
+    /*
+     * Read audio parameters configurations for input and output buffers.
+     *
+     * @return config configuration descriptor.
+     */
+    @callflow(next={"*"})
+    getConfig() generates (EffectConfig config);
+
+    /*
+     * Read audio parameters configurations for input and output buffers of
+     * reverse stream.
+     *
+     * @return config configuration descriptor.
+     */
+    @callflow(next={"*"})
+    getConfigReverse() generates (EffectConfig config);
+
+    /*
+     * Queries for supported configurations for a particular feature (e.g. get
+     * the supported combinations of main and auxiliary channels for a noise
+     * suppressor).  The command parameter is a list of the feature identifiers.
+     *
+     * @return retval absence of the feature support is indicated using
+     *                NOT_SUPPORTED code.
+     * @return result list of configuration descriptors.
+     */
+    @callflow(next={"*"})
+    getFeatureSupportedConfigs(vec<EffectFeature> features)
+            generates (Result retval, vec<EffectFeatureConfig> result);
+
+    /*
+     * Retrieves current configuration for a given feature.
+     *
+     * @return retval absence of the feature support is indicated using
+     *                NOT_SUPPORTED code.
+     * @return result configuration descriptor.
+     */
+    @callflow(next={"*"})
+    getFeatureConfig(EffectFeature feature)
+            generates (Result retval, EffectFeatureConfig result);
+
+    /*
+     * Sets current configuration for a given feature.
+     *
+     * @return retval operation completion status.
+     */
+    @callflow(next={"*"})
+    setFeatureConfig(EffectFeatureConfig featureConfig)
+            generates (Result retval);
+
+    /*
+     * Set the audio source the capture path is configured for (Camcorder, voice
+     * recognition...).
+     *
+     * @param source source descriptor.
+     */
+    @callflow(next={"*"})
+    setAudioSource(AudioSource source);
+
+    /*
+     * This command indicates if the playback thread the effect is attached to
+     * is offloaded or not, and updates the I/O handle of the playback thread
+     * the effect is attached to.
+     *
+     * @param param effect offload descriptor.
+     * @return retval operation completion status.
+     */
+    @callflow(next={"*"})
+    offload(EffectOffloadParameter param) generates (Result retval);
+
+    /*
+     * Returns the effect descriptor.
+     *
+     * @return descriptor effect descriptor.
+     */
+    @callflow(next={"*"})
+    getDescriptor() generates (EffectDescriptor descriptor);
+
+    /*
+     * Effect process function. Takes input samples as specified (count and
+     * location) in input buffer and returns processed samples as specified in
+     * output buffer. If the buffer descriptor is empty the function must use
+     * either the buffer or the buffer provider callback installed by the
+     * setConfig command.  The effect framework must call the 'process' function
+     * after the 'enable' command is received and until the 'disable' is
+     * received. When the engine receives the 'disable' command it should turn
+     * off the effect gracefully and when done indicate that it is OK to stop
+     * calling the 'process' function by returning the INVALID_STATE status.
+     *
+     * @param inBuffer input audio buffer.
+     * @return retval operation completion status.
+     * @return outBuffer output audio buffer.
+     */
+    // TODO(mnaganov): replace with FMQ version.
+    @callflow(next={"*"})
+    process(AudioBuffer inBuffer)
+            generates (Result retval, AudioBuffer outBuffer);
+
+    /*
+     * Process reverse stream function. This function is used to pass a
+     * reference stream to the effect engine. If the engine does not need a
+     * reference stream, this function MUST return NOT_SUPPORTED. For example,
+     * this function would typically implemented by an Echo Canceler.
+     *
+     * @param inBuffer input audio buffer.
+     * @return retval operation completion status.
+     * @return outBuffer output audio buffer.
+     */
+    // TODO(mnaganov): replace with FMQ version.
+    @callflow(next={"*"})
+    processReverse(AudioBuffer inBuffer)
+            generates (Result retval, AudioBuffer outBuffer);
+
+    /*
+     * Execute a vendor specific command on the effect. The command code
+     * and data, as well as result data are not interpreted by Android
+     * Framework and are passed as-is between the application and the effect.
+     *
+     * The effect must use standard POSIX.1-2001 error codes for the operation
+     * completion status.
+     *
+     * Use this method only if the effect is provided by a third party, and
+     * there is no interface defined for it. This method only works for effects
+     * implemented in software.
+     *
+     * @param commandId the ID of the command.
+     * @param data command data.
+     * @return status command completion status.
+     * @return result result data.
+     */
+    command(uint32_t commandId, vec<uint8_t> data)
+            generates (int32_t status, vec<uint8_t> result);
+
+    /*
+     * Set a vendor-specific parameter and apply it immediately. The parameter
+     * code and data are not interpreted by Android Framework and are passed
+     * as-is between the application and the effect.
+     *
+     * The effect must use INVALID_ARGUMENTS return code if the parameter ID is
+     * unknown or if provided parameter data is invalid. If the effect does not
+     * support setting vendor-specific parameters, it must return NOT_SUPPORTED.
+     *
+     * Use this method only if the effect is provided by a third party, and
+     * there is no interface defined for it. This method only works for effects
+     * implemented in software.
+     *
+     * @param parameter identifying data of the parameter.
+     * @param value the value of the parameter.
+     * @return retval operation completion status.
+     */
+    @callflow(next={"*"})
+    setParameter(vec<uint8_t> parameter, vec<uint8_t> value)
+            generates (Result retval);
+
+    /*
+     * Get a vendor-specific parameter value. The parameter code and returned
+     * data are not interpreted by Android Framework and are passed as-is
+     * between the application and the effect.
+     *
+     * The effect must use INVALID_ARGUMENTS return code if the parameter ID is
+     * unknown. If the effect does not support setting vendor-specific
+     * parameters, it must return NOT_SUPPORTED.
+     *
+     * Use this method only if the effect is provided by a third party, and
+     * there is no interface defined for it.  This method only works for effects
+     * implemented in software.
+     *
+     * @param parameter identifying data of the parameter.
+     * @return retval operation completion status.
+     * @return result the value of the parameter.
+     */
+    @callflow(next={"*"})
+    getParameter(vec<uint8_t> parameter)
+            generates (Result retval, vec<uint8_t> value);
+};