policy.h revision 05ddca504ce8e0e61b41e5c1aebea72086eea57b 
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 SAMPLE_RATE_HZ_MAX 192000
26
27// Used when a client opens a capture stream, without specifying a desired sample rate.
28#define SAMPLE_RATE_HZ_DEFAULT 48000
29
30// For mixed output and inputs, the policy will use max mixer channel count.
31// Do not limit channel count otherwise
32#define MAX_MIXER_CHANNEL_COUNT FCC_8
33
34/**
35 * A device mask for all audio input devices that are considered "virtual" when evaluating
36 * active inputs in getActiveInput()
37 */
38#define APM_AUDIO_IN_DEVICE_VIRTUAL_ALL  (AUDIO_DEVICE_IN_REMOTE_SUBMIX|AUDIO_DEVICE_IN_FM_TUNER)
39
40
41/**
42 * A device mask for all audio input and output devices where matching inputs/outputs on device
43 * type alone is not enough: the address must match too
44 */
45#define APM_AUDIO_DEVICE_OUT_MATCH_ADDRESS_ALL (AUDIO_DEVICE_OUT_REMOTE_SUBMIX)
46
47#define APM_AUDIO_DEVICE_IN_MATCH_ADDRESS_ALL (AUDIO_DEVICE_IN_REMOTE_SUBMIX)
48
49/**
50 * Check if the state given correspond to an in call state.
51 * @TODO find a better name for widely call state
52 *
53 * @param[in] state to consider
54 *
55 * @return true if given state represents a device in a telephony or VoIP call
56 */
57static inline bool is_state_in_call(int state)
58{
59    return (state == AUDIO_MODE_IN_CALL) || (state == AUDIO_MODE_IN_COMMUNICATION);
60}
61
62/**
63 * Check if the input device given is considered as a virtual device.
64 *
65 * @param[in] device to consider
66 *
67 * @return true if the device is a virtual one, false otherwise.
68 */
69static inline bool is_virtual_input_device(audio_devices_t device)
70{
71    if ((device & AUDIO_DEVICE_BIT_IN) != 0) {
72        device &= ~AUDIO_DEVICE_BIT_IN;
73        if ((popcount(device) == 1) && ((device & ~APM_AUDIO_IN_DEVICE_VIRTUAL_ALL) == 0))
74            return true;
75    }
76    return false;
77}
78
79/**
80 * Check whether the device type is one
81 * where addresses are used to distinguish between one connected device and another
82 *
83 * @param[in] device to consider
84 *
85 * @return true if the device needs distinguish on address, false otherwise..
86 */
87static inline bool device_distinguishes_on_address(audio_devices_t device)
88{
89    return (((device & AUDIO_DEVICE_BIT_IN) != 0) &&
90            ((~AUDIO_DEVICE_BIT_IN & device & APM_AUDIO_DEVICE_IN_MATCH_ADDRESS_ALL) != 0)) ||
91           (((device & AUDIO_DEVICE_BIT_IN) == 0) &&
92            ((device & APM_AUDIO_DEVICE_OUT_MATCH_ADDRESS_ALL) != 0));
93}
94
95/* Indicates if audio formats are equivalent when considering a match between
96 * audio HAL supported formats and client requested formats
97 */
98static inline bool audio_formats_match(audio_format_t format1,
99                                       audio_format_t format2)
100{
101    if (audio_is_linear_pcm(format1) &&
102            (audio_bytes_per_sample(format1) > 2) &&
103            audio_is_linear_pcm(format2) &&
104            (audio_bytes_per_sample(format2) > 2)) {
105        return true;
106    }
107    return format1 == format2;
108}
109