1/*
2 * Copyright (C) 2017 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17package android.hardware.automotive.audiocontrol@1.0;
18
19
20/**
21 * Interacts with the car's audio subsystem to manage audio sources and volumes
22 */
23interface IAudioControl {
24
25    /**
26     * Called at startup once per context to get the mapping from ContextNumber to
27     * busAddress. This lets the car tell the framework to which physical output stream
28     * each context should be routed.
29     *
30     * For every context, a valid bus number (0 - num busses-1) must be returned. If an
31     * unrecognized contextNumber is encountered, then -1 shall be returned.
32     */
33    getBusForContext(ContextNumber contextNumber)
34        generates (int32_t busNumber);
35
36
37    /**
38     * Control the right/left balance setting of the car speakers.
39     *
40     * This is intended to shift the speaker volume toward the right (+) or left (-) side of
41     * the car. 0.0 means "centered". +1.0 means fully right. -1.0 means fully left.
42     *
43     * A value outside the range -1 to 1 must be clamped by the implementation to the -1 to 1
44     * range.
45     */
46    oneway setBalanceTowardRight(float value);
47
48
49    /**
50     * Control the fore/aft fade setting of the car speakers.
51     *
52     * This is intended to shift the speaker volume toward the front (+) or back (-) of the car.
53     * 0.0 means "centered". +1.0 means fully forward. -1.0 means fully rearward.
54     *
55     * A value outside the range -1 to 1 must be clamped by the implementation to the -1 to 1
56     * range.
57     */
58    oneway setFadeTowardFront(float value);
59};
60
61