src/sysaudio: move mach-sysaudio@ce8ab30dd300b822224d14997c58c06520b642c9 package to here

Helps hexops/mach#1165

Signed-off-by: Stephen Gutekanst <stephen@hexops.com>

src/sysaudio/util.zig

@@ -0,0 +1,61 @@
+const std = @import("std");
+const main = @import("main.zig");
+
+pub const DevicesInfo = struct {
+    list: std.ArrayListUnmanaged(main.Device),
+    default_output: ?usize,
+    default_input: ?usize,
+
+    pub fn init() DevicesInfo {
+        return .{
+            .list = .{},
+            .default_output = null,
+            .default_input = null,
+        };
+    }
+
+    pub fn clear(device_info: *DevicesInfo) void {
+        device_info.default_output = null;
+        device_info.default_input = null;
+        device_info.list.clearRetainingCapacity();
+    }
+
+    pub fn get(device_info: DevicesInfo, i: usize) main.Device {
+        return device_info.list.items[i];
+    }
+
+    pub fn default(device_info: DevicesInfo, mode: main.Device.Mode) ?main.Device {
+        const index = switch (mode) {
+            .playback => device_info.default_output,
+            .capture => device_info.default_input,
+        } orelse {
+            for (device_info.list.items) |device| {
+                if (device.mode == mode) {
+                    return device;
+                }
+            }
+            return null;
+        };
+        return device_info.get(index);
+    }
+
+    pub fn setDefault(device_info: *DevicesInfo, mode: main.Device.Mode, i: usize) void {
+        switch (mode) {
+            .playback => device_info.default_output = i,
+            .capture => device_info.default_input = i,
+        }
+    }
+};
+
+pub fn Range(comptime T: type) type {
+    return struct {
+        min: T,
+        max: T,
+
+        pub fn clamp(range: @This(), val: T) T {
+            return std.math.clamp(val, range.min, range.max);
+        }
+    };
+}
+
+pub fn doNothing() callconv(.C) void {}