50 lines
2.7 KiB
C#
50 lines
2.7 KiB
C#
 
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using NAudio.CoreAudioApi;
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using RemSound.Core;
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namespace RemSound.App;
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/// <summary>
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/// The "Use Windows default audio device, follows Windows changes" choice, shared by the main window
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/// and the lock-screen service so both offer — and resolve — it identically. It is NOT a real endpoint:
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/// it's a sentinel that both persist in <c>SelectedWasapiSendOutputs</c>, and that the send-spec
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/// builders resolve to the CURRENT default render endpoint each time capture is (re)built. When Windows'
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/// default output changes, the device-change notifier drives a rebuild and the new default is picked up.
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///
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/// <para>Kept in one place because the service must track the main app: the main window already had this
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/// (its <c>DefaultLoopbackSendFollower</c> + <c>ResolveDefaultDeviceId</c>); the service reuses the very
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/// same sentinel and resolver rather than inventing a parallel one that would diverge.</para>
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/// </summary>
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internal static class AudioDefaultFollower
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{
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/// <summary>Sentinel device id for "follow the Windows default OUTPUT (loopback send)". Namespaced so
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/// it can never collide with a real WASAPI endpoint id (which look like "{0.0.0.00000000}.{guid}").</summary>
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internal const string LoopbackSendId = "__use-default-loopback-send__";
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internal static bool IsLoopbackSend(string? deviceId) =>
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string.Equals(deviceId, LoopbackSendId, StringComparison.OrdinalIgnoreCase);
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/// <summary>The follower list entry for the "WASAPI outputs to send" list. A fresh instance each call
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/// (list controls take ownership of their items).</summary>
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internal static AudioDeviceChoice LoopbackSendChoice() =>
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new("Use Windows default audio device, follows Windows changes", LoopbackSendId, CaptureKind.Loopback)
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{ IsDefaultFollower = true };
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/// <summary>The current Windows default OUTPUT (render) endpoint id, or null if none. Convenience for
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/// callers that only follow the default output and shouldn't have to name a NAudio DataFlow.</summary>
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internal static string? ResolveDefaultRenderId() => ResolveDefaultDeviceId(DataFlow.Render);
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/// <summary>The current Windows default endpoint id for the given direction, or null if there isn't
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/// one (or it can't be read). Render = default speakers/output; Capture = default mic/input.</summary>
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internal static string? ResolveDefaultDeviceId(DataFlow flow)
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{
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try
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{
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using var enumerator = new MMDeviceEnumerator();
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if (!enumerator.HasDefaultAudioEndpoint(flow, Role.Multimedia)) return null;
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using var device = enumerator.GetDefaultAudioEndpoint(flow, Role.Multimedia);
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return device.ID;
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}
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catch { return null; }
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}
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}
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