audio/6.0/IStreamOutEventCallback.hal

/*
 * Copyright (C) 2020 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@6.0;

/**
 * Asynchronous stream out event callback interface. The interface provides
 * a way for the HAL to notify platform when there are changes, e.g. codec
 * format change, from the lower layer.
 */
interface IStreamOutEventCallback {
    /**
     * Codec format changed.
     *
     * @param audioMetadata is a buffer containing decoded format changes
     *     reported by codec. The buffer contains data that can be transformed
     *     to audio metadata, which is a C++ object based map. See
     *     `system/media/audio_utils/include/audio_utils/Metadata.h` for
     *     more details.
     */
    oneway onCodecFormatChanged(vec<uint8_t> audioMetadata);
};