policy.h revision 84332aaa807037baca05340875f2d94fcc519ac4 
1/*
2 * Copyright (C) 2015 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
17#pragma once
18
19#include <system/audio.h>
20
21static const audio_format_t gDynamicFormat = AUDIO_FORMAT_DEFAULT;
22
23// For mixed output and inputs, the policy will use max mixer sampling rates.
24// Do not limit sampling rate otherwise
25#define MAX_MIXER_SAMPLING_RATE 192000
26
27// For mixed output and inputs, the policy will use max mixer channel count.
28// Do not limit channel count otherwise
29#define MAX_MIXER_CHANNEL_COUNT 8
30
31/**
32 * A device mask for all audio input devices that are considered "virtual" when evaluating
33 * active inputs in getActiveInput()
34 */
35#define APM_AUDIO_IN_DEVICE_VIRTUAL_ALL  (AUDIO_DEVICE_IN_REMOTE_SUBMIX|AUDIO_DEVICE_IN_FM_TUNER)
36
37
38/**
39 * A device mask for all audio input and output devices where matching inputs/outputs on device
40 * type alone is not enough: the address must match too
41 */
42#define APM_AUDIO_DEVICE_OUT_MATCH_ADDRESS_ALL (AUDIO_DEVICE_OUT_REMOTE_SUBMIX)
43
44#define APM_AUDIO_DEVICE_IN_MATCH_ADDRESS_ALL (AUDIO_DEVICE_IN_REMOTE_SUBMIX)
45
46/**
47 * Check if the state given correspond to an in call state.
48 * @TODO find a better name for widely call state
49 *
50 * @param[in] state to consider
51 *
52 * @return true if given state represents a device in a telephony or VoIP call
53 */
54static inline bool is_state_in_call(int state)
55{
56    return (state == AUDIO_MODE_IN_CALL) || (state == AUDIO_MODE_IN_COMMUNICATION);
57}
58
59/**
60 * Check if the input device given is considered as a virtual device.
61 *
62 * @param[in] device to consider
63 *
64 * @return true if the device is a virtual one, false otherwise.
65 */
66static inline bool is_virtual_input_device(audio_devices_t device)
67{
68    if ((device & AUDIO_DEVICE_BIT_IN) != 0) {
69        device &= ~AUDIO_DEVICE_BIT_IN;
70        if ((popcount(device) == 1) && ((device & ~APM_AUDIO_IN_DEVICE_VIRTUAL_ALL) == 0))
71            return true;
72    }
73    return false;
74}
75
76/**
77 * Check whether the device type is one
78 * where addresses are used to distinguish between one connected device and another
79 *
80 * @param[in] device to consider
81 *
82 * @return true if the device needs distinguish on address, false otherwise..
83 */
84static inline bool device_distinguishes_on_address(audio_devices_t device)
85{
86    return (((device & AUDIO_DEVICE_BIT_IN) != 0) &&
87            ((~AUDIO_DEVICE_BIT_IN & device & APM_AUDIO_DEVICE_IN_MATCH_ADDRESS_ALL) != 0)) ||
88           (((device & AUDIO_DEVICE_BIT_IN) == 0) &&
89            ((device & APM_AUDIO_DEVICE_OUT_MATCH_ADDRESS_ALL) != 0));
90}
91