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4fc4790 | 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 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 | import CoreAudio
import Foundation
import OSLog
final class AudioInputDeviceObserver {
private let logger = Logger(subsystem: "ai.openclaw", category: "audio.devices")
private var isActive = false
private var devicesListener: AudioObjectPropertyListenerBlock?
private var defaultInputListener: AudioObjectPropertyListenerBlock?
static func defaultInputDeviceUID() -> String? {
let systemObject = AudioObjectID(kAudioObjectSystemObject)
var address = AudioObjectPropertyAddress(
mSelector: kAudioHardwarePropertyDefaultInputDevice,
mScope: kAudioObjectPropertyScopeGlobal,
mElement: kAudioObjectPropertyElementMain)
var deviceID = AudioObjectID(0)
var size = UInt32(MemoryLayout<AudioObjectID>.size)
let status = AudioObjectGetPropertyData(
systemObject,
&address,
0,
nil,
&size,
&deviceID)
guard status == noErr, deviceID != 0 else { return nil }
return self.deviceUID(for: deviceID)
}
static func aliveInputDeviceUIDs() -> Set<String> {
let systemObject = AudioObjectID(kAudioObjectSystemObject)
var address = AudioObjectPropertyAddress(
mSelector: kAudioHardwarePropertyDevices,
mScope: kAudioObjectPropertyScopeGlobal,
mElement: kAudioObjectPropertyElementMain)
var size: UInt32 = 0
var status = AudioObjectGetPropertyDataSize(systemObject, &address, 0, nil, &size)
guard status == noErr, size > 0 else { return [] }
let count = Int(size) / MemoryLayout<AudioObjectID>.size
var deviceIDs = [AudioObjectID](repeating: 0, count: count)
status = AudioObjectGetPropertyData(systemObject, &address, 0, nil, &size, &deviceIDs)
guard status == noErr else { return [] }
var output = Set<String>()
for deviceID in deviceIDs {
guard self.deviceIsAlive(deviceID) else { continue }
guard self.deviceHasInput(deviceID) else { continue }
if let uid = self.deviceUID(for: deviceID) {
output.insert(uid)
}
}
return output
}
static func defaultInputDeviceSummary() -> String {
let systemObject = AudioObjectID(kAudioObjectSystemObject)
var address = AudioObjectPropertyAddress(
mSelector: kAudioHardwarePropertyDefaultInputDevice,
mScope: kAudioObjectPropertyScopeGlobal,
mElement: kAudioObjectPropertyElementMain)
var deviceID = AudioObjectID(0)
var size = UInt32(MemoryLayout<AudioObjectID>.size)
let status = AudioObjectGetPropertyData(
systemObject,
&address,
0,
nil,
&size,
&deviceID)
guard status == noErr, deviceID != 0 else {
return "defaultInput=unknown"
}
let uid = self.deviceUID(for: deviceID) ?? "unknown"
let name = self.deviceName(for: deviceID) ?? "unknown"
return "defaultInput=\(name) (\(uid))"
}
func start(onChange: @escaping @Sendable () -> Void) {
guard !self.isActive else { return }
self.isActive = true
let systemObject = AudioObjectID(kAudioObjectSystemObject)
let queue = DispatchQueue.main
var devicesAddress = AudioObjectPropertyAddress(
mSelector: kAudioHardwarePropertyDevices,
mScope: kAudioObjectPropertyScopeGlobal,
mElement: kAudioObjectPropertyElementMain)
let devicesListener: AudioObjectPropertyListenerBlock = { _, _ in
self.logDefaultInputChange(reason: "devices")
onChange()
}
let devicesStatus = AudioObjectAddPropertyListenerBlock(
systemObject,
&devicesAddress,
queue,
devicesListener)
var defaultInputAddress = AudioObjectPropertyAddress(
mSelector: kAudioHardwarePropertyDefaultInputDevice,
mScope: kAudioObjectPropertyScopeGlobal,
mElement: kAudioObjectPropertyElementMain)
let defaultInputListener: AudioObjectPropertyListenerBlock = { _, _ in
self.logDefaultInputChange(reason: "default")
onChange()
}
let defaultStatus = AudioObjectAddPropertyListenerBlock(
systemObject,
&defaultInputAddress,
queue,
defaultInputListener)
if devicesStatus != noErr || defaultStatus != noErr {
self.logger.error("audio device observer install failed devices=\(devicesStatus) default=\(defaultStatus)")
}
self.logger.info("audio device observer started (\(Self.defaultInputDeviceSummary(), privacy: .public))")
self.devicesListener = devicesListener
self.defaultInputListener = defaultInputListener
}
func stop() {
guard self.isActive else { return }
self.isActive = false
let systemObject = AudioObjectID(kAudioObjectSystemObject)
if let devicesListener {
var devicesAddress = AudioObjectPropertyAddress(
mSelector: kAudioHardwarePropertyDevices,
mScope: kAudioObjectPropertyScopeGlobal,
mElement: kAudioObjectPropertyElementMain)
_ = AudioObjectRemovePropertyListenerBlock(
systemObject,
&devicesAddress,
DispatchQueue.main,
devicesListener)
}
if let defaultInputListener {
var defaultInputAddress = AudioObjectPropertyAddress(
mSelector: kAudioHardwarePropertyDefaultInputDevice,
mScope: kAudioObjectPropertyScopeGlobal,
mElement: kAudioObjectPropertyElementMain)
_ = AudioObjectRemovePropertyListenerBlock(
systemObject,
&defaultInputAddress,
DispatchQueue.main,
defaultInputListener)
}
self.devicesListener = nil
self.defaultInputListener = nil
}
private static func deviceUID(for deviceID: AudioObjectID) -> String? {
var address = AudioObjectPropertyAddress(
mSelector: kAudioDevicePropertyDeviceUID,
mScope: kAudioObjectPropertyScopeGlobal,
mElement: kAudioObjectPropertyElementMain)
var uid: Unmanaged<CFString>?
var size = UInt32(MemoryLayout<Unmanaged<CFString>?>.size)
let status = AudioObjectGetPropertyData(deviceID, &address, 0, nil, &size, &uid)
guard status == noErr, let uid else { return nil }
return uid.takeUnretainedValue() as String
}
private static func deviceName(for deviceID: AudioObjectID) -> String? {
var address = AudioObjectPropertyAddress(
mSelector: kAudioObjectPropertyName,
mScope: kAudioObjectPropertyScopeGlobal,
mElement: kAudioObjectPropertyElementMain)
var name: Unmanaged<CFString>?
var size = UInt32(MemoryLayout<Unmanaged<CFString>?>.size)
let status = AudioObjectGetPropertyData(deviceID, &address, 0, nil, &size, &name)
guard status == noErr, let name else { return nil }
return name.takeUnretainedValue() as String
}
private static func deviceIsAlive(_ deviceID: AudioObjectID) -> Bool {
var address = AudioObjectPropertyAddress(
mSelector: kAudioDevicePropertyDeviceIsAlive,
mScope: kAudioObjectPropertyScopeGlobal,
mElement: kAudioObjectPropertyElementMain)
var alive: UInt32 = 0
var size = UInt32(MemoryLayout<UInt32>.size)
let status = AudioObjectGetPropertyData(deviceID, &address, 0, nil, &size, &alive)
return status == noErr && alive != 0
}
private static func deviceHasInput(_ deviceID: AudioObjectID) -> Bool {
var address = AudioObjectPropertyAddress(
mSelector: kAudioDevicePropertyStreamConfiguration,
mScope: kAudioDevicePropertyScopeInput,
mElement: kAudioObjectPropertyElementMain)
var size: UInt32 = 0
var status = AudioObjectGetPropertyDataSize(deviceID, &address, 0, nil, &size)
guard status == noErr, size > 0 else { return false }
let raw = UnsafeMutableRawPointer.allocate(
byteCount: Int(size),
alignment: MemoryLayout<AudioBufferList>.alignment)
defer { raw.deallocate() }
let bufferList = raw.bindMemory(to: AudioBufferList.self, capacity: 1)
status = AudioObjectGetPropertyData(deviceID, &address, 0, nil, &size, bufferList)
guard status == noErr else { return false }
let buffers = UnsafeMutableAudioBufferListPointer(bufferList)
return buffers.contains(where: { $0.mNumberChannels > 0 })
}
private func logDefaultInputChange(reason: StaticString) {
self.logger.info("audio input changed (\(reason)) (\(Self.defaultInputDeviceSummary(), privacy: .public))")
}
}
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