oboe 0.6.1

Safe interface for oboe an android library for low latency audio IO
Documentation 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167

use num_derive::FromPrimitive;

use crate::AudioFormat;

pub(crate) struct Context;

impl Context {
    pub const AUDIO_SERVICE: &'static str = "audio";
}

pub(crate) struct PackageManager;

impl PackageManager {
    pub const FEATURE_AUDIO_LOW_LATENCY: &'static str = "android.hardware.audio.low_latency";
    pub const FEATURE_AUDIO_OUTPUT: &'static str = "android.hardware.audio.output";
    pub const FEATURE_AUDIO_PRO: &'static str = "android.hardware.audio.pro";
    pub const FEATURE_MICROPHONE: &'static str = "android.hardware.microphone";
    pub const FEATURE_MIDI: &'static str = "android.software.midi";
}

pub(crate) struct AudioManager;

impl AudioManager {
    pub const PROPERTY_OUTPUT_SAMPLE_RATE: &'static str =
        "android.media.property.OUTPUT_SAMPLE_RATE";
    pub const PROPERTY_OUTPUT_FRAMES_PER_BUFFER: &'static str =
        "android.media.property.OUTPUT_FRAMES_PER_BUFFER";

    pub const GET_DEVICES_INPUTS: i32 = 1 << 0;
    pub const GET_DEVICES_OUTPUTS: i32 = 1 << 1;
    pub const GET_DEVICES_ALL: i32 = Self::GET_DEVICES_INPUTS | Self::GET_DEVICES_OUTPUTS;
}

/**
 * The Android audio device info
 */
#[cfg_attr(feature = "doc-cfg", doc(cfg(feature = "java-interface")))]
#[derive(Debug, Clone)]
pub struct AudioDeviceInfo {
    /**
     * Device identifier
     */
    pub id: i32,

    /**
     * The type of device
     */
    pub device_type: AudioDeviceType,

    /**
     * The device can be used for playback and/or capture
     */
    pub direction: AudioDeviceDirection,

    /**
     * Device address
     */
    pub address: String,

    /**
     * Device product name
     */
    pub product_name: String,

    /**
     * Available channel configurations
     */
    pub channel_counts: Vec<i32>,

    /**
     * Supported sample rates
     */
    pub sample_rates: Vec<i32>,

    /**
     * Supported audio formats
     */
    pub formats: Vec<AudioFormat>,
}

/**
 * The type of audio device
 */
#[cfg_attr(feature = "doc-cfg", doc(cfg(feature = "java-interface")))]
#[derive(Debug, Clone, Copy, FromPrimitive)]
#[non_exhaustive]
#[repr(i32)]
pub enum AudioDeviceType {
    Unknown = 0,
    AuxLine = 19,
    BleBroadcast = 30,
    BleHeadset = 26,
    BleSpeaker = 27,
    BluetoothA2DP = 8,
    BluetoothSCO = 7,
    BuiltinEarpiece = 1,
    BuiltinMic = 15,
    BuiltinSpeaker = 2,
    BuiltinSpeakerSafe = 24,
    Bus = 21,
    Dock = 13,
    Fm = 14,
    FmTuner = 16,
    Hdmi = 9,
    HdmiArc = 10,
    HdmiEarc = 29,
    HearingAid = 23,
    Ip = 20,
    LineAnalog = 5,
    LineDigital = 6,
    RemoteSubmix = 25,
    Telephony = 18,
    TvTuner = 17,
    UsbAccessory = 12,
    UsbDevice = 11,
    UsbHeadset = 22,
    WiredHeadphones = 4,
    WiredHeadset = 3,
    Unsupported = -1,
}

/**
 * The direction of audio device
 */
#[cfg_attr(feature = "doc-cfg", doc(cfg(feature = "java-interface")))]
#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
#[repr(i32)]
pub enum AudioDeviceDirection {
    Dumb = 0,
    Input = AudioManager::GET_DEVICES_INPUTS,
    Output = AudioManager::GET_DEVICES_OUTPUTS,
    InputOutput = AudioManager::GET_DEVICES_ALL,
}

impl AudioDeviceDirection {
    pub fn new(is_input: bool, is_output: bool) -> Self {
        use self::AudioDeviceDirection::*;
        match (is_input, is_output) {
            (true, true) => InputOutput,
            (false, true) => Output,
            (true, false) => Input,
            _ => Dumb,
        }
    }

    pub fn is_input(&self) -> bool {
        0 < *self as i32 & AudioDeviceDirection::Input as i32
    }

    pub fn is_output(&self) -> bool {
        0 < *self as i32 & AudioDeviceDirection::Output as i32
    }
}

impl AudioFormat {
    pub(crate) const ENCODING_PCM_16BIT: i32 = 2;
    //pub(crate) const ENCODING_PCM_8BIT: i32 = 3;
    pub(crate) const ENCODING_PCM_FLOAT: i32 = 4;

    pub(crate) fn from_encoding(encoding: i32) -> Option<AudioFormat> {
        match encoding {
            AudioFormat::ENCODING_PCM_16BIT => Some(AudioFormat::I16),
            AudioFormat::ENCODING_PCM_FLOAT => Some(AudioFormat::F32),
            _ => None,
        }
    }
}