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79 lines
3.2 KiB
79 lines
3.2 KiB
4 months ago
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/*
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* Copyright (C) 2020 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package android.hardware.automotive.audiocontrol@2.0;
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import ICloseHandle;
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import IFocusListener;
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import android.hardware.audio.common@6.0::AudioUsage;
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/**
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* Interacts with the car's audio subsystem to manage audio sources and volumes
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*/
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interface IAudioControl {
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/**
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* Registers focus listener to be used by HAL for requesting and abandoning audio focus.
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*
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* It is expected that there will only ever be a single focus listener registered. If the
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* observer dies, the HAL implementation must unregister observer automatically. If called when
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* a listener is already registered, the existing one should be unregistered and replaced with
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* the new listener.
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*
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* @param listener the listener interface
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* @return closeHandle A handle to unregister observer.
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*/
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registerFocusListener(IFocusListener listener) generates (ICloseHandle closeHandle);
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/**
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* Notifies HAL of changes in audio focus status for focuses requested or abandoned by the HAL.
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*
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* This will be called in response to IFocusListener's requestAudioFocus and
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* abandonAudioFocus, as well as part of any change in focus being held by the HAL due focus
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* request from other activities or services.
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*
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* The HAL is not required to wait for an callback of AUDIOFOCUS_GAIN before playing audio, nor
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* is it required to stop playing audio in the event of a AUDIOFOCUS_LOSS callback is received.
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*
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* @param usage The audio usage associated with the focus change {@code AttributeUsage}
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* @param zoneId The identifier for the audio zone that the HAL is playing the stream in
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* @param focusChange the AudioFocusChange that has occurred
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*/
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oneway onAudioFocusChange(bitfield<AudioUsage> usage, int32_t zoneId,
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bitfield<AudioFocusChange> focusChange);
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/**
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* Control the right/left balance setting of the car speakers.
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*
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* This is intended to shift the speaker volume toward the right (+) or left (-) side of
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* the car. 0.0 means "centered". +1.0 means fully right. -1.0 means fully left.
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*
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* A value outside the range -1 to 1 must be clamped by the implementation to the -1 to 1
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* range.
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*/
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oneway setBalanceTowardRight(float value);
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/**
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* Control the fore/aft fade setting of the car speakers.
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*
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* This is intended to shift the speaker volume toward the front (+) or back (-) of the car.
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* 0.0 means "centered". +1.0 means fully forward. -1.0 means fully rearward.
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*
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* A value outside the range -1 to 1 must be clamped by the implementation to the -1 to 1
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* range.
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*/
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oneway setFadeTowardFront(float value);
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};
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