控制音量混音器

我想控制其他应用程序量（firefox）。

我可以用Volume Mixer来做

什么是Volume Mixer的库？

Answer 1

这是一个示例C＃控制台应用程序。 它基于Windows核心audio库 。 它仅适用于Windows 7及更高版本。

 using System; using System.Runtime.InteropServices; using System.Collections.Generic; namespace SetAppVolumne { class Program { static void Main(string[] args) { const string app = "Mozilla Firefox"; foreach (string name in EnumerateApplications()) { Console.WriteLine("name:" + name); if (name == app) { // display mute state & volume level (% of master) Console.WriteLine("Mute:" + GetApplicationMute(app)); Console.WriteLine("Volume:" + GetApplicationVolume(app)); // mute the application SetApplicationMute(app, true); // set the volume to half of master volume (50%) SetApplicationVolume(app, 50); } } } public static float? GetApplicationVolume(string name) { ISimpleAudioVolume volume = GetVolumeObject(name); if (volume == null) return null; float level; volume.GetMasterVolume(out level); return level * 100; } public static bool? GetApplicationMute(string name) { ISimpleAudioVolume volume = GetVolumeObject(name); if (volume == null) return null; bool mute; volume.GetMute(out mute); return mute; } public static void SetApplicationVolume(string name, float level) { ISimpleAudioVolume volume = GetVolumeObject(name); if (volume == null) return; Guid guid = Guid.Empty; volume.SetMasterVolume(level / 100, ref guid); } public static void SetApplicationMute(string name, bool mute) { ISimpleAudioVolume volume = GetVolumeObject(name); if (volume == null) return; Guid guid = Guid.Empty; volume.SetMute(mute, ref guid); } public static IEnumerable<string> EnumerateApplications() { // get the speakers (1st render + multimedia) device IMMDeviceEnumerator deviceEnumerator = (IMMDeviceEnumerator)(new MMDeviceEnumerator()); IMMDevice speakers; deviceEnumerator.GetDefaultAudioEndpoint(EDataFlow.eRender, ERole.eMultimedia, out speakers); // activate the session manager. we need the enumerator Guid IID_IAudioSessionManager2 = typeof(IAudioSessionManager2).GUID; object o; speakers.Activate(ref IID_IAudioSessionManager2, 0, IntPtr.Zero, out o); IAudioSessionManager2 mgr = (IAudioSessionManager2)o; // enumerate sessions for on this device IAudioSessionEnumerator sessionEnumerator; mgr.GetSessionEnumerator(out sessionEnumerator); int count; sessionEnumerator.GetCount(out count); for (int i = 0; i < count; i++) { IAudioSessionControl ctl; sessionEnumerator.GetSession(i, out ctl); string dn; ctl.GetDisplayName(out dn); yield return dn; Marshal.ReleaseComObject(ctl); } Marshal.ReleaseComObject(sessionEnumerator); Marshal.ReleaseComObject(mgr); Marshal.ReleaseComObject(speakers); Marshal.ReleaseComObject(deviceEnumerator); } private static ISimpleAudioVolume GetVolumeObject(string name) { // get the speakers (1st render + multimedia) device IMMDeviceEnumerator deviceEnumerator = (IMMDeviceEnumerator)(new MMDeviceEnumerator()); IMMDevice speakers; deviceEnumerator.GetDefaultAudioEndpoint(EDataFlow.eRender, ERole.eMultimedia, out speakers); // activate the session manager. we need the enumerator Guid IID_IAudioSessionManager2 = typeof(IAudioSessionManager2).GUID; object o; speakers.Activate(ref IID_IAudioSessionManager2, 0, IntPtr.Zero, out o); IAudioSessionManager2 mgr = (IAudioSessionManager2)o; // enumerate sessions for on this device IAudioSessionEnumerator sessionEnumerator; mgr.GetSessionEnumerator(out sessionEnumerator); int count; sessionEnumerator.GetCount(out count); // search for an audio session with the required name // NOTE: we could also use the process id instead of the app name (with IAudioSessionControl2) ISimpleAudioVolume volumeControl = null; for (int i = 0; i < count; i++) { IAudioSessionControl ctl; sessionEnumerator.GetSession(i, out ctl); string dn; ctl.GetDisplayName(out dn); if (string.Compare(name, dn, StringComparison.OrdinalIgnoreCase) == 0) { volumeControl = ctl as ISimpleAudioVolume; break; } Marshal.ReleaseComObject(ctl); } Marshal.ReleaseComObject(sessionEnumerator); Marshal.ReleaseComObject(mgr); Marshal.ReleaseComObject(speakers); Marshal.ReleaseComObject(deviceEnumerator); return volumeControl; } } [ComImport] [Guid("BCDE0395-E52F-467C-8E3D-C4579291692E")] internal class MMDeviceEnumerator { } internal enum EDataFlow { eRender, eCapture, eAll, EDataFlow_enum_count } internal enum ERole { eConsole, eMultimedia, eCommunications, ERole_enum_count } [Guid("A95664D2-9614-4F35-A746-DE8DB63617E6"), InterfaceType(ComInterfaceType.InterfaceIsIUnknown)] internal interface IMMDeviceEnumerator { int NotImpl1(); [PreserveSig] int GetDefaultAudioEndpoint(EDataFlow dataFlow, ERole role, out IMMDevice ppDevice); // the rest is not implemented } [Guid("D666063F-1587-4E43-81F1-B948E807363F"), InterfaceType(ComInterfaceType.InterfaceIsIUnknown)] internal interface IMMDevice { [PreserveSig] int Activate(ref Guid iid, int dwClsCtx, IntPtr pActivationParams, [MarshalAs(UnmanagedType.IUnknown)] out object ppInterface); // the rest is not implemented } [Guid("77AA99A0-1BD6-484F-8BC7-2C654C9A9B6F"), InterfaceType(ComInterfaceType.InterfaceIsIUnknown)] internal interface IAudioSessionManager2 { int NotImpl1(); int NotImpl2(); [PreserveSig] int GetSessionEnumerator(out IAudioSessionEnumerator SessionEnum); // the rest is not implemented } [Guid("E2F5BB11-0570-40CA-ACDD-3AA01277DEE8"), InterfaceType(ComInterfaceType.InterfaceIsIUnknown)] internal interface IAudioSessionEnumerator { [PreserveSig] int GetCount(out int SessionCount); [PreserveSig] int GetSession(int SessionCount, out IAudioSessionControl Session); } [Guid("F4B1A599-7266-4319-A8CA-E70ACB11E8CD"), InterfaceType(ComInterfaceType.InterfaceIsIUnknown)] internal interface IAudioSessionControl { int NotImpl1(); [PreserveSig] int GetDisplayName([MarshalAs(UnmanagedType.LPWStr)] out string pRetVal); // the rest is not implemented } [Guid("87CE5498-68D6-44E5-9215-6DA47EF883D8"), InterfaceType(ComInterfaceType.InterfaceIsIUnknown)] internal interface ISimpleAudioVolume { [PreserveSig] int SetMasterVolume(float fLevel, ref Guid EventContext); [PreserveSig] int GetMasterVolume(out float pfLevel); [PreserveSig] int SetMute(bool bMute, ref Guid EventContext); [PreserveSig] int GetMute(out bool pbMute); } } 

注意：我没有完全定义接口，只有代码工作需要什么。