feat(mac,ios,playback,store): initial macos implementation

Packages/AmphlifyKit/Sources/Playback/SampleRateMatcher.swift

@@ -0,0 +1,34 @@
+import Domain
+import Foundation
+
+public struct OutputDeviceInfo: Hashable, Sendable {
+    public var id: UInt32
+    public var name: String
+    public var nominalRate: Double
+    public var availableRates: [Double]
+
+    public init(id: UInt32, name: String, nominalRate: Double, availableRates: [Double]) {
+        self.id = id
+        self.name = name
+        self.nominalRate = nominalRate
+        self.availableRates = availableRates
+    }
+}
+
+public struct SampleRateMatcher: Sendable {
+    public var isEnabled: Bool
+
+    public init(isEnabled: Bool) {
+        self.isEnabled = isEnabled
+    }
+
+    public func targetRate(for format: AudioFormat?, on device: OutputDeviceInfo?) -> Double? {
+        guard isEnabled, let device, let rate = format?.sampleRate.map(Double.init) else { return nil }
+        guard rate != device.nominalRate, device.availableRates.contains(rate) else { return nil }
+        return rate
+    }
+}
+
+public protocol PlaybackTuning: Sendable {
+    func setMatchesSampleRate(_ isOn: Bool) async
+}