ros
d5e827112a
- Created PROTOCOL.md to outline the MusicBridge protocol v1, detailing setup, TLS, pairing, state management, and command structure. - Implemented SystemVolume class for managing system audio levels, including methods for setting, reading, changing, and muting volume. - Added unit tests for the MusicBridge agent, covering pairing, identity storage, command validation, and media state management. - Included tests for real-time media reading from Windows and ensured proper handling of artwork caching and retrieval.
97 lines
3.9 KiB
C#
97 lines
3.9 KiB
C#
using System.Runtime.InteropServices;
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namespace MusicBridge.Agent;
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// Obtain the current default output for each operation, including after device changes.
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internal static class SystemVolume
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{
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public static void Set(float level) => WithEndpoint(endpoint =>
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{
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if (!float.IsFinite(level) || level < 0 || level > 1)
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throw new ArgumentOutOfRangeException(nameof(level));
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var context = Guid.Empty;
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endpoint.SetMasterVolumeLevelScalar(level, ref context);
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return true;
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});
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public static (float Level, bool Muted) Read() => WithEndpoint(endpoint =>
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{
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endpoint.GetMasterVolumeLevelScalar(out var level);
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endpoint.GetMute(out var muted);
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return (level, muted);
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});
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public static void Change(float delta) => WithEndpoint(endpoint =>
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{
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endpoint.GetMasterVolumeLevelScalar(out var level);
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var context = Guid.Empty;
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endpoint.SetMasterVolumeLevelScalar(Math.Clamp(level + delta, 0f, 1f), ref context);
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return true;
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});
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public static void ToggleMute() => WithEndpoint(endpoint =>
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{
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endpoint.GetMute(out var muted);
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var context = Guid.Empty;
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endpoint.SetMute(!muted, ref context);
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return true;
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});
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private static T WithEndpoint<T>(Func<IAudioEndpointVolume, T> action)
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{
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var enumerator = (IMMDeviceEnumerator)new MMDeviceEnumerator();
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IMMDevice? device = null;
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object? volume = null;
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try
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{
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enumerator.GetDefaultAudioEndpoint(0, 1, out device); // Render, Multimedia
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var iid = typeof(IAudioEndpointVolume).GUID;
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device.Activate(ref iid, 23, IntPtr.Zero, out volume);
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return action((IAudioEndpointVolume)volume);
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}
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finally
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{
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if (volume is not null) Marshal.ReleaseComObject(volume);
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if (device is not null) Marshal.ReleaseComObject(device);
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Marshal.ReleaseComObject(enumerator);
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}
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}
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[ComImport, Guid("BCDE0395-E52F-467C-8E3D-C4579291692E")]
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private class MMDeviceEnumerator { }
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// COM declarations must preserve the native vtable order, including unused methods.
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// HRESULT failures are translated to exceptions by the COM interop runtime.
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[ComImport, Guid("A95664D2-9614-4F35-A746-DE8DB63617E6"), InterfaceType(ComInterfaceType.InterfaceIsIUnknown)]
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private interface IMMDeviceEnumerator
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{
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void EnumAudioEndpoints(int flow, uint mask, out IntPtr devices);
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void GetDefaultAudioEndpoint(int flow, int role, out IMMDevice device);
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}
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[ComImport, Guid("D666063F-1587-4E43-81F1-B948E807363F"), InterfaceType(ComInterfaceType.InterfaceIsIUnknown)]
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private interface IMMDevice
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{
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void Activate(ref Guid iid, uint context, IntPtr activation,
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[MarshalAs(UnmanagedType.IUnknown)] out object instance);
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}
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[ComImport, Guid("5CDF2C82-841E-4546-9722-0CF74078229A"), InterfaceType(ComInterfaceType.InterfaceIsIUnknown)]
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private interface IAudioEndpointVolume
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{
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void RegisterControlChangeNotify(IntPtr callback);
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void UnregisterControlChangeNotify(IntPtr callback);
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void GetChannelCount(out uint count);
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void SetMasterVolumeLevel(float level, ref Guid context);
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void SetMasterVolumeLevelScalar(float level, ref Guid context);
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void GetMasterVolumeLevel(out float level);
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void GetMasterVolumeLevelScalar(out float level);
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void SetChannelVolumeLevel(uint channel, float level, ref Guid context);
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void SetChannelVolumeLevelScalar(uint channel, float level, ref Guid context);
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void GetChannelVolumeLevel(uint channel, out float level);
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void GetChannelVolumeLevelScalar(uint channel, out float level);
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void SetMute([MarshalAs(UnmanagedType.Bool)] bool muted, ref Guid context);
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void GetMute([MarshalAs(UnmanagedType.Bool)] out bool muted);
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}
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}
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