diff --git a/media/Android.bp b/media/Android.bp
index b77c701..20a9656 100644
--- a/media/Android.bp
+++ b/media/Android.bp
@@ -133,3 +133,41 @@
     },
 }
 
+aidl_interface {
+    name: "soundtrigger_middleware-aidl",
+    local_include_dir: "java",
+    srcs: [
+        "java/android/media/soundtrigger_middleware/ConfidenceLevel.aidl",
+        "java/android/media/soundtrigger_middleware/ISoundTriggerCallback.aidl",
+        "java/android/media/soundtrigger_middleware/ISoundTriggerMiddlewareService.aidl",
+        "java/android/media/soundtrigger_middleware/ISoundTriggerModule.aidl",
+        "java/android/media/soundtrigger_middleware/Phrase.aidl",
+        "java/android/media/soundtrigger_middleware/PhraseRecognitionEvent.aidl",
+        "java/android/media/soundtrigger_middleware/PhraseRecognitionExtra.aidl",
+        "java/android/media/soundtrigger_middleware/PhraseSoundModel.aidl",
+        "java/android/media/soundtrigger_middleware/RecognitionConfig.aidl",
+        "java/android/media/soundtrigger_middleware/RecognitionEvent.aidl",
+        "java/android/media/soundtrigger_middleware/RecognitionMode.aidl",
+        "java/android/media/soundtrigger_middleware/RecognitionStatus.aidl",
+        "java/android/media/soundtrigger_middleware/SoundModel.aidl",
+        "java/android/media/soundtrigger_middleware/SoundModelType.aidl",
+        "java/android/media/soundtrigger_middleware/SoundTriggerModuleDescriptor.aidl",
+        "java/android/media/soundtrigger_middleware/SoundTriggerModuleProperties.aidl",
+        "java/android/media/soundtrigger_middleware/Status.aidl",
+    ],
+    backend:
+    {
+        cpp: {
+            enabled: true,
+        },
+        java: {
+            // Already generated as part of the entire media java library.
+            enabled: false,
+        },
+        ndk: {
+            // Not currently needed, and disabled because of b/146172425
+            enabled: false,
+        },
+    },
+    imports: [ "audio_common-aidl" ],
+}
diff --git a/media/java/android/media/soundtrigger_middleware/ConfidenceLevel.aidl b/media/java/android/media/soundtrigger_middleware/ConfidenceLevel.aidl
new file mode 100644
index 0000000..3dbc705
--- /dev/null
+++ b/media/java/android/media/soundtrigger_middleware/ConfidenceLevel.aidl
@@ -0,0 +1,35 @@
+/*
+ * Copyright (C) 2019 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.media.soundtrigger_middleware;
+
+/**
+ * A recognition confidence level.
+ * This type is used to represent either a threshold or an actual detection confidence level.
+ *
+ * {@hide}
+ */
+parcelable ConfidenceLevel {
+    /** user ID. */
+    int userId;
+    /**
+     * Confidence level in percent (0 - 100).
+     * <ul>
+     * <li>Min level for recognition configuration
+     * <li>Detected level for recognition event.
+     * </ul>
+     */
+    int levelPercent;
+}
diff --git a/media/java/android/media/soundtrigger_middleware/ISoundTriggerCallback.aidl b/media/java/android/media/soundtrigger_middleware/ISoundTriggerCallback.aidl
new file mode 100644
index 0000000..149c1cd
--- /dev/null
+++ b/media/java/android/media/soundtrigger_middleware/ISoundTriggerCallback.aidl
@@ -0,0 +1,47 @@
+/*
+ * Copyright (C) 2019 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.media.soundtrigger_middleware;
+
+import android.media.soundtrigger_middleware.RecognitionEvent;
+import android.media.soundtrigger_middleware.PhraseRecognitionEvent;
+
+/**
+ * Main interface for a client to get notifications of events coming from this module.
+ *
+ * {@hide}
+ */
+oneway interface ISoundTriggerCallback {
+    /**
+     * Invoked whenever a recognition event is triggered (typically, on recognition, but also in
+     * case of external aborting of a recognition or a forced recognition event - see the status
+     * code in the event for determining).
+     */
+    void onRecognition(int modelHandle, in RecognitionEvent event);
+     /**
+      * Invoked whenever a phrase recognition event is triggered (typically, on recognition, but
+      * also in case of external aborting of a recognition or a forced recognition event - see the
+      * status code in the event for determining).
+      */
+    void onPhraseRecognition(int modelHandle, in PhraseRecognitionEvent event);
+    /**
+     * Notifies the client the recognition has become available after previously having been
+     * unavailable, or vice versa. This method will always be invoked once immediately after
+     * attachment, and then every time there is a change in availability.
+     * When availability changes from available to unavailable, all active recognitions are aborted,
+     * and this event will be sent in addition to the abort event.
+     */
+    void onRecognitionAvailabilityChange(boolean available);
+}
diff --git a/media/java/android/media/soundtrigger_middleware/ISoundTriggerMiddlewareService.aidl b/media/java/android/media/soundtrigger_middleware/ISoundTriggerMiddlewareService.aidl
new file mode 100644
index 0000000..8033307
--- /dev/null
+++ b/media/java/android/media/soundtrigger_middleware/ISoundTriggerMiddlewareService.aidl
@@ -0,0 +1,48 @@
+/*
+ * Copyright (C) 2019 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.media.soundtrigger_middleware;
+
+import android.media.soundtrigger_middleware.ISoundTriggerModule;
+import android.media.soundtrigger_middleware.ISoundTriggerCallback;
+import android.media.soundtrigger_middleware.SoundTriggerModuleDescriptor;
+
+/**
+ * Main entry point into this module.
+ *
+ * Allows the client to enumerate the available soundtrigger devices and their capabilities, then
+ * attach to either one of them in order to use it.
+ *
+ * {@hide}
+ */
+interface ISoundTriggerMiddlewareService {
+    /**
+     * Query the available modules and their capabilities.
+     */
+    SoundTriggerModuleDescriptor[] listModules();
+
+    /**
+     * Attach to one of the available modules.
+     * listModules() must be called prior to calling this method and the provided handle must be
+     * one of the handles from the returned list.
+     */
+    ISoundTriggerModule attach(int handle, ISoundTriggerCallback callback);
+
+    /**
+     * Notify the service that external input capture is taking place. This may cause some of the
+     * active recognitions to be aborted.
+     */
+    void setExternalCaptureState(boolean active);
+}
\ No newline at end of file
diff --git a/media/java/android/media/soundtrigger_middleware/ISoundTriggerModule.aidl b/media/java/android/media/soundtrigger_middleware/ISoundTriggerModule.aidl
new file mode 100644
index 0000000..202595a
--- /dev/null
+++ b/media/java/android/media/soundtrigger_middleware/ISoundTriggerModule.aidl
@@ -0,0 +1,105 @@
+/*
+ * Copyright (C) 2019 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.media.soundtrigger_middleware;
+
+import android.media.soundtrigger_middleware.SoundModel;
+import android.media.soundtrigger_middleware.PhraseSoundModel;
+import android.media.soundtrigger_middleware.RecognitionConfig;
+
+/**
+ * A sound-trigger module.
+ *
+ * This interface allows a client to operate a sound-trigger device, intended for low-power
+ * detection of various sound patterns, represented by a "sound model".
+ *
+ * Basic operation is to load a sound model (either a generic one or a "phrase" model), then
+ * initiate recognition on this model. A trigger will be delivered asynchronously via a callback
+ * provided by the caller earlier, when attaching to this interface.
+ *
+ * In additon to recognition events, this module will also produce abort events in cases where
+ * recognition has been externally preempted.
+ *
+ * {@hide}
+ */
+interface ISoundTriggerModule {
+    /**
+     * Load a sound model. Will return a handle to the model on success or will throw a
+     * ServiceSpecificException with one of the {@link Status} error codes upon a recoverable error
+     * (for example, lack of resources of loading a model at the time of call.
+     * Model must eventually be unloaded using {@link #unloadModel(int)} prior to detaching.
+     *
+     * May throw a ServiceSpecificException with an RESOURCE_CONTENTION status to indicate that
+     * resources required for loading the model are currently consumed by other clients.
+     */
+    int loadModel(in SoundModel model);
+
+    /**
+     * Load a phrase sound model. Will return a handle to the model on success or will throw a
+     * ServiceSpecificException with one of the {@link Status} error codes upon a recoverable error
+     * (for example, lack of resources of loading a model at the time of call.
+     * Model must eventually be unloaded using unloadModel prior to detaching.
+     *
+     * May throw a ServiceSpecificException with an RESOURCE_CONTENTION status to indicate that
+     * resources required for loading the model are currently consumed by other clients.
+     */
+    int loadPhraseModel(in PhraseSoundModel model);
+
+    /**
+     * Unload a model, previously loaded with loadModel or loadPhraseModel. After unloading, model
+     * can no longer be used for recognition and the resources occupied by it are released.
+     * Model must not be active at the time of unloading. Cient may call stopRecognition to ensure
+     * that.
+     */
+    void unloadModel(int modelHandle);
+
+    /**
+     * Initiate recognition on a previously loaded model.
+     * Recognition event would eventually be delivered via the client-provided callback, typically
+     * supplied during attachment to this interface.
+     *
+     * Once a recognition event is passed to the client, the recognition automatically become
+     * inactive, unless the event is of the RecognitionStatus.FORCED kind. Client can also shut down
+     * the recognition explicitly, via stopRecognition.
+     */
+    void startRecognition(int modelHandle, in RecognitionConfig config);
+
+    /**
+     * Stop a recognition of a previously active recognition. Will NOT generate a recognition event.
+     * This call is idempotent - calling it on an inactive model has no effect. However, it must
+     * only be used with a loaded model handle.
+     */
+    void stopRecognition(int modelHandle);
+
+    /**
+     * Force generation of a recognition event. Handle must be that of a loaded model. If
+     * recognition is inactive, will do nothing. If recognition is active, will asynchronously
+     * deliever an event with RecognitionStatus.FORCED status and leave recognition in active state.
+     * To avoid any race conditions, once an event signalling the automatic stopping of recognition
+     * is sent, no more forced events will get sent (even if previously requested) until recognition
+     * is explicitly started again.
+     *
+     * Since not all module implementations support this feature, may throw a
+     * ServiceSpecificException with an OPERATION_NOT_SUPPORTED status.
+     */
+    void forceRecognitionEvent(int modelHandle);
+
+    /**
+     * Detach from the module, releasing any active resources.
+     * This will ensure the client callback is no longer called after this call returns.
+     * All models must have been unloaded prior to calling this method.
+     */
+    void detach();
+}
\ No newline at end of file
diff --git a/media/java/android/media/soundtrigger_middleware/Phrase.aidl b/media/java/android/media/soundtrigger_middleware/Phrase.aidl
new file mode 100644
index 0000000..98a489f8
--- /dev/null
+++ b/media/java/android/media/soundtrigger_middleware/Phrase.aidl
@@ -0,0 +1,34 @@
+/*
+ * Copyright (C) 2019 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.media.soundtrigger_middleware;
+
+/**
+ * Key phrase descriptor.
+ *
+ * {@hide}
+ */
+parcelable Phrase {
+    /** Unique keyphrase ID assigned at enrollment time. */
+    int id;
+    /** Recognition modes supported by this key phrase (bitfield of RecognitionMode enum). */
+    int recognitionModes;
+    /** List of users IDs associated with this key phrase. */
+    int[] users;
+    /** Locale - Java Locale style (e.g. en_US). */
+    String locale;
+    /** Phrase text. */
+    String text;
+}
diff --git a/media/java/android/media/soundtrigger_middleware/PhraseRecognitionEvent.aidl b/media/java/android/media/soundtrigger_middleware/PhraseRecognitionEvent.aidl
new file mode 100644
index 0000000..6a3ec61
--- /dev/null
+++ b/media/java/android/media/soundtrigger_middleware/PhraseRecognitionEvent.aidl
@@ -0,0 +1,31 @@
+/*
+ * Copyright (C) 2019 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.media.soundtrigger_middleware;
+
+import android.media.soundtrigger_middleware.PhraseRecognitionExtra;
+import android.media.soundtrigger_middleware.RecognitionEvent;
+
+/**
+ * An event that gets sent to indicate a phrase recognition (or aborting of the recognition
+   process).
+ * {@hide}
+ */
+parcelable PhraseRecognitionEvent {
+    /** Common recognition event. */
+    RecognitionEvent common;
+    /** List of descriptors for each recognized key phrase */
+    PhraseRecognitionExtra[] phraseExtras;
+}
diff --git a/media/java/android/media/soundtrigger_middleware/PhraseRecognitionExtra.aidl b/media/java/android/media/soundtrigger_middleware/PhraseRecognitionExtra.aidl
new file mode 100644
index 0000000..cb96bf3
--- /dev/null
+++ b/media/java/android/media/soundtrigger_middleware/PhraseRecognitionExtra.aidl
@@ -0,0 +1,35 @@
+/*
+ * Copyright (C) 2019 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.media.soundtrigger_middleware;
+
+import android.media.soundtrigger_middleware.ConfidenceLevel;
+
+/**
+ * Specialized recognition event for key phrase detection.
+ * {@hide}
+ */
+parcelable PhraseRecognitionExtra {
+    // TODO(ytai): Constants / enums.
+
+    /** keyphrase ID */
+    int id;
+    /** recognition modes used for this keyphrase */
+    int recognitionModes;
+    /** confidence level for mode RECOGNITION_MODE_VOICE_TRIGGER */
+    int confidenceLevel;
+    /** number of user confidence levels */
+    ConfidenceLevel[] levels;
+}
diff --git a/media/java/android/media/soundtrigger_middleware/PhraseSoundModel.aidl b/media/java/android/media/soundtrigger_middleware/PhraseSoundModel.aidl
new file mode 100644
index 0000000..81028c1
--- /dev/null
+++ b/media/java/android/media/soundtrigger_middleware/PhraseSoundModel.aidl
@@ -0,0 +1,32 @@
+/*
+ * Copyright (C) 2019 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.media.soundtrigger_middleware;
+
+import android.media.soundtrigger_middleware.SoundModel;
+import android.media.soundtrigger_middleware.Phrase;
+
+/**
+ * Specialized sound model for key phrase detection.
+ * Proprietary representation of key phrases in binary data must match
+ * information indicated by phrases field.
+ * {@hide}
+ */
+parcelable PhraseSoundModel {
+    /** Common part of sound model descriptor */
+    SoundModel common;
+    /** List of descriptors for key phrases supported by this sound model */
+    Phrase[] phrases;
+}
diff --git a/media/java/android/media/soundtrigger_middleware/RecognitionConfig.aidl b/media/java/android/media/soundtrigger_middleware/RecognitionConfig.aidl
new file mode 100644
index 0000000..c7642e8
--- /dev/null
+++ b/media/java/android/media/soundtrigger_middleware/RecognitionConfig.aidl
@@ -0,0 +1,33 @@
+/*
+ * Copyright (C) 2019 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.media.soundtrigger_middleware;
+
+import android.media.soundtrigger_middleware.PhraseRecognitionExtra;
+
+/**
+ * Configuration for tuning behavior of an active recognition process.
+ * {@hide}
+ */
+parcelable RecognitionConfig {
+    /* Capture and buffer audio for this recognition instance. */
+    boolean captureRequested;
+
+    /* Configuration for each key phrase. */
+    PhraseRecognitionExtra[] phraseRecognitionExtras;
+
+    /** Opaque capture configuration data. */
+    byte[] data;
+}
diff --git a/media/java/android/media/soundtrigger_middleware/RecognitionEvent.aidl b/media/java/android/media/soundtrigger_middleware/RecognitionEvent.aidl
new file mode 100644
index 0000000..de4d060
--- /dev/null
+++ b/media/java/android/media/soundtrigger_middleware/RecognitionEvent.aidl
@@ -0,0 +1,51 @@
+/*
+ * Copyright (C) 2019 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.media.soundtrigger_middleware;
+
+import android.media.audio.common.AudioConfig;
+import android.media.soundtrigger_middleware.RecognitionStatus;
+import android.media.soundtrigger_middleware.SoundModelType;
+
+/**
+ * An event that gets sent to indicate a recognition (or aborting of the recognition process).
+ * {@hide}
+ */
+parcelable RecognitionEvent {
+    /** Recognition status. */
+    RecognitionStatus status;
+    /** Event type, same as sound model type. */
+    SoundModelType type;
+    /** Is it possible to capture audio from this utterance buffered by the implementation. */
+    boolean captureAvailable;
+    /* Audio session ID. framework use. */
+    int captureSession;
+    /**
+     * Delay in ms between end of model detection and start of audio available for capture.
+     * A negative value is possible (e.g. if key phrase is also available for Capture.
+     */
+    int captureDelayMs;
+    /** Duration in ms of audio captured before the start of the trigger. 0 if none. */
+    int capturePreambleMs;
+    /** If true, the 'data' field below contains the capture of the trigger sound. */
+    boolean triggerInData;
+    /**
+     * Audio format of either the trigger in event data or to use for capture of the rest of the
+     * utterance.
+     */
+    AudioConfig audioConfig;
+    /** Additional data. */
+    byte[] data;
+}
diff --git a/media/java/android/media/soundtrigger_middleware/RecognitionMode.aidl b/media/java/android/media/soundtrigger_middleware/RecognitionMode.aidl
new file mode 100644
index 0000000..d8bfff4
--- /dev/null
+++ b/media/java/android/media/soundtrigger_middleware/RecognitionMode.aidl
@@ -0,0 +1,32 @@
+/*
+ * Copyright (C) 2019 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.media.soundtrigger_middleware;
+
+/**
+ * Recognition mode.
+ * {@hide}
+ */
+@Backing(type="int")
+enum RecognitionMode {
+    /** Simple voice trigger. */
+    VOICE_TRIGGER       = 0x1,
+    /** Trigger only if one user in model identified. */
+    USER_IDENTIFICATION = 0x2,
+    /** Trigger only if one user in model authenticated. */
+    USER_AUTHENTICATION = 0x4,
+    /** Generic sound trigger. */
+    GENERIC_TRIGGER     = 0x8,
+}
diff --git a/media/java/android/media/soundtrigger_middleware/RecognitionStatus.aidl b/media/java/android/media/soundtrigger_middleware/RecognitionStatus.aidl
new file mode 100644
index 0000000..d563edc
--- /dev/null
+++ b/media/java/android/media/soundtrigger_middleware/RecognitionStatus.aidl
@@ -0,0 +1,35 @@
+/*
+ * Copyright (C) 2019 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.media.soundtrigger_middleware;
+
+/**
+ * A status for indicating the type of a recognition event.
+ * {@hide}
+ */
+@Backing(type="int")
+enum RecognitionStatus {
+    /** Recognition success. */
+    SUCCESS = 0,
+    /** Recognition aborted (e.g. capture preempted by another use-case. */
+    ABORTED = 1,
+    /** Recognition failure. */
+    FAILURE = 2,
+    /**
+    * Recognition event was triggered by a forceRecognitionEvent request, not by the DSP.
+    * Note that forced detections *do not* stop the active recognition, unlike the other types.
+    */
+    FORCED = 3
+}
diff --git a/media/java/android/media/soundtrigger_middleware/SoundModel.aidl b/media/java/android/media/soundtrigger_middleware/SoundModel.aidl
new file mode 100644
index 0000000..fba1ee50
--- /dev/null
+++ b/media/java/android/media/soundtrigger_middleware/SoundModel.aidl
@@ -0,0 +1,36 @@
+/*
+ * Copyright (C) 2019 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.media.soundtrigger_middleware;
+
+import android.media.soundtrigger_middleware.SoundModelType;
+
+/**
+ * Base sound model descriptor. This struct can be extended for various specific types by way of
+ * aggregation.
+ * {@hide}
+ */
+parcelable SoundModel {
+    /** Model type. */
+    SoundModelType type;
+    /** Unique sound model ID. */
+    String uuid;
+    /**
+     * Unique vendor ID. Identifies the engine the sound model
+     * was build for */
+    String vendorUuid;
+    /** Opaque data transparent to Android framework */
+    byte[] data;
+}
diff --git a/media/java/android/media/soundtrigger_middleware/SoundModelType.aidl b/media/java/android/media/soundtrigger_middleware/SoundModelType.aidl
new file mode 100644
index 0000000..f2abc9a
--- /dev/null
+++ b/media/java/android/media/soundtrigger_middleware/SoundModelType.aidl
@@ -0,0 +1,30 @@
+/*
+ * Copyright (C) 2019 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.media.soundtrigger_middleware;
+
+/**
+ * Sound model type.
+ * {@hide}
+ */
+@Backing(type="int")
+enum SoundModelType {
+    /** Unspecified sound model type */
+    UNKNOWN = -1,
+    /** Key phrase sound models */
+    KEYPHRASE = 0,
+    /** All models other than keyphrase */
+    GENERIC = 1,
+}
diff --git a/media/java/android/media/soundtrigger_middleware/SoundTriggerModuleDescriptor.aidl b/media/java/android/media/soundtrigger_middleware/SoundTriggerModuleDescriptor.aidl
new file mode 100644
index 0000000..667135f
--- /dev/null
+++ b/media/java/android/media/soundtrigger_middleware/SoundTriggerModuleDescriptor.aidl
@@ -0,0 +1,31 @@
+/*
+ * Copyright (C) 2019 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.media.soundtrigger_middleware;
+
+import android.media.soundtrigger_middleware.SoundTriggerModuleProperties;
+
+/**
+ * A descriptor of an available sound trigger module, containing the handle used to reference the
+ * module, as well its capabilities.
+ * {@hide}
+ */
+parcelable SoundTriggerModuleDescriptor {
+    /** Module handle to be used for attaching to it. */
+    int handle;
+    /** Module capabilities. */
+    SoundTriggerModuleProperties properties;
+}
+
diff --git a/media/java/android/media/soundtrigger_middleware/SoundTriggerModuleProperties.aidl b/media/java/android/media/soundtrigger_middleware/SoundTriggerModuleProperties.aidl
new file mode 100644
index 0000000..1a3b402
--- /dev/null
+++ b/media/java/android/media/soundtrigger_middleware/SoundTriggerModuleProperties.aidl
@@ -0,0 +1,53 @@
+/*
+ * Copyright (C) 2019 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.media.soundtrigger_middleware;
+
+/**
+ * Capabilities of a sound trigger module.
+ * {@hide}
+ */
+parcelable SoundTriggerModuleProperties {
+    /** Implementor name */
+    String   implementor;
+    /** Implementation description */
+    String   description;
+    /** Implementation version */
+    int version;
+    /**
+     * Unique implementation ID. The UUID must change with each version of
+       the engine implementation */
+    String     uuid;
+    /** Maximum number of concurrent sound models loaded */
+    int maxSoundModels;
+    /** Maximum number of key phrases */
+    int maxKeyPhrases;
+    /** Maximum number of concurrent users detected */
+    int maxUsers;
+    /** All supported modes. e.g RecognitionMode.VOICE_TRIGGER */
+    int recognitionModes;
+    /** Supports seamless transition from detection to capture */
+    boolean     captureTransition;
+    /** Maximum buffering capacity in ms if captureTransition is true */
+    int maxBufferMs;
+    /** Supports capture by other use cases while detection is active */
+    boolean     concurrentCapture;
+    /** Returns the trigger capture in event */
+    boolean     triggerInEvent;
+    /**
+     * Rated power consumption when detection is active with TDB
+     * silence/sound/speech ratio */
+    int powerConsumptionMw;
+}
diff --git a/media/java/android/media/soundtrigger_middleware/Status.aidl b/media/java/android/media/soundtrigger_middleware/Status.aidl
new file mode 100644
index 0000000..d8f9d8f
--- /dev/null
+++ b/media/java/android/media/soundtrigger_middleware/Status.aidl
@@ -0,0 +1,29 @@
+/*
+ * Copyright (C) 2019 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.media.soundtrigger_middleware;
+
+/**
+ * {@hide}
+ */
+@Backing(type="int")
+enum Status {
+    /** Success. */
+    SUCCESS = 0,
+    /** Failure due to resource contention. This is typically a temporary condition. */
+    RESOURCE_CONTENTION = 1,
+    /** Operation is not supported in this implementation. This is a permanent condition. */
+    OPERATION_NOT_SUPPORTED = 2,
+}