soundtrigger/2.2/ISoundTriggerHw.hal

/*
 * Copyright 2018 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.soundtrigger@2.2;

import @2.0::SoundModelHandle;
import @2.1::ISoundTriggerHw;

/**
 * SoundTrigger HAL interface. Used for hardware recognition of hotwords
 * and other sounds.
 */
interface ISoundTriggerHw extends @2.1::ISoundTriggerHw {

    /**
     * Get the state of a given model.
     * The model state is returned asynchronously as a RecognitionEvent via
     * the callback that was registered in StartRecognition().
     * @param modelHandle The handle of the sound model whose state is being
     *                    queried.
     * @return retval Operation completion status: 0 in case of success,
     *                -ENOSYS in case of invalid model handle,
     *                -ENOMEM in case of memory allocation failure,
     *                -ENODEV in case of initialization error,
     *                -EINVAL in case where a recognition event is already
     *                        being processed.
     */
    getModelState(SoundModelHandle modelHandle) generates (int32_t retval);
};