[SystemVolumePlugin][Windows] Support for changing default audio output from remote device

plugins/systemvolume/CMakeLists.txt

@@ -26,6 +26,9 @@ if(WIN32)
         Qt5::Core
         ole32
     )
+    target_sources(kdeconnect_systemvolume
+            PRIVATE
+            PolicyConfig.h)
 elseif(APPLE)
     target_link_libraries(kdeconnect_systemvolume
         kdeconnectcore

plugins/systemvolume/PolicyConfig.h

+/* The MIT License (MIT)
+
+Copyright (c) 2015 DefSound
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+THE SOFTWARE.
+*/
+// ----------------------------------------------------------------------------
+// PolicyConfig.h
+// Undocumented COM-interface IPolicyConfig.
+// Use for set default audio render endpoint
+// @author EreTIk
+// ----------------------------------------------------------------------------
+
+
+#pragma once
+#include "mmreg.h"
+
+
+interface DECLSPEC_UUID("f8679f50-850a-41cf-9c72-430f290290c8") IPolicyConfig;
+class DECLSPEC_UUID("870af99c-171d-4f9e-af0d-e63df40c2bc9") CPolicyConfigClient;
+// ----------------------------------------------------------------------------
+// class CPolicyConfigClient
+// {870af99c-171d-4f9e-af0d-e63df40c2bc9}
+//  
+// interface IPolicyConfig
+// {f8679f50-850a-41cf-9c72-430f290290c8}
+//
+// Query interface:
+// CComPtr<IPolicyConfig> PolicyConfig;
+// PolicyConfig.CoCreateInstance(__uuidof(CPolicyConfigClient));
+// 
+// @compatible: Windows 7 and Later
+// ----------------------------------------------------------------------------
+interface IPolicyConfig : public IUnknown
+{
+public:
+
+    virtual HRESULT GetMixFormat(
+        PCWSTR,
+        WAVEFORMATEX **
+    );
+
+    virtual HRESULT STDMETHODCALLTYPE GetDeviceFormat(
+        PCWSTR,
+        INT,
+        WAVEFORMATEX **
+    );
+
+    virtual HRESULT STDMETHODCALLTYPE ResetDeviceFormat(
+        PCWSTR
+    );
+
+    virtual HRESULT STDMETHODCALLTYPE SetDeviceFormat(
+        PCWSTR,
+        WAVEFORMATEX *,
+        WAVEFORMATEX *
+    );
+
+    virtual HRESULT STDMETHODCALLTYPE GetProcessingPeriod(
+        PCWSTR,
+        INT,
+        PINT64,
+        PINT64
+    );
+
+    virtual HRESULT STDMETHODCALLTYPE SetProcessingPeriod(
+        PCWSTR,
+        PINT64
+    );
+
+    virtual HRESULT STDMETHODCALLTYPE GetShareMode(
+        PCWSTR,
+        struct DeviceShareMode *
+    );
+
+    virtual HRESULT STDMETHODCALLTYPE SetShareMode(
+        PCWSTR,
+        struct DeviceShareMode *
+    );
+
+    virtual HRESULT STDMETHODCALLTYPE GetPropertyValue(
+        PCWSTR,
+        const PROPERTYKEY &,
+        PROPVARIANT *
+    );
+
+    virtual HRESULT STDMETHODCALLTYPE SetPropertyValue(
+        PCWSTR,
+        const PROPERTYKEY &,
+        PROPVARIANT *
+    );
+
+    virtual HRESULT STDMETHODCALLTYPE SetDefaultEndpoint(
+        __in PCWSTR wszDeviceId,
+        __in ERole eRole 
+    );
+
+    virtual HRESULT STDMETHODCALLTYPE SetEndpointVisibility(
+        PCWSTR,
+        INT
+    );
+};
+
+interface DECLSPEC_UUID("568b9108-44bf-40b4-9006-86afe5b5a620") IPolicyConfigVista;
+class DECLSPEC_UUID("294935CE-F637-4E7C-A41B-AB255460B862") CPolicyConfigVistaClient;
+// ----------------------------------------------------------------------------
+// class CPolicyConfigVistaClient
+// {294935CE-F637-4E7C-A41B-AB255460B862}
+//  
+// interface IPolicyConfigVista
+// {568b9108-44bf-40b4-9006-86afe5b5a620}
+//
+// Query interface:
+// CComPtr<IPolicyConfigVista> PolicyConfig;
+// PolicyConfig.CoCreateInstance(__uuidof(CPolicyConfigVistaClient));
+// 
+// @compatible: Windows Vista and Later
+// ----------------------------------------------------------------------------
+interface IPolicyConfigVista : public IUnknown
+{
+public:
+
+    virtual HRESULT GetMixFormat(
+        PCWSTR,
+        WAVEFORMATEX **
+    );  // not available on Windows 7, use method from IPolicyConfig
+
+    virtual HRESULT STDMETHODCALLTYPE GetDeviceFormat(
+        PCWSTR,
+        INT,
+        WAVEFORMATEX **
+    );
+
+    virtual HRESULT STDMETHODCALLTYPE SetDeviceFormat(
+        PCWSTR,
+        WAVEFORMATEX *,
+        WAVEFORMATEX *
+    );
+
+    virtual HRESULT STDMETHODCALLTYPE GetProcessingPeriod(
+        PCWSTR,
+        INT,
+        PINT64,
+        PINT64
+    );  // not available on Windows 7, use method from IPolicyConfig
+
+    virtual HRESULT STDMETHODCALLTYPE SetProcessingPeriod(
+        PCWSTR,
+        PINT64
+    );  // not available on Windows 7, use method from IPolicyConfig
+
+    virtual HRESULT STDMETHODCALLTYPE GetShareMode(
+        PCWSTR,
+        struct DeviceShareMode *
+    );  // not available on Windows 7, use method from IPolicyConfig
+
+    virtual HRESULT STDMETHODCALLTYPE SetShareMode(
+        PCWSTR,
+        struct DeviceShareMode *
+    );  // not available on Windows 7, use method from IPolicyConfig
+
+    virtual HRESULT STDMETHODCALLTYPE GetPropertyValue(
+        PCWSTR,
+        const PROPERTYKEY &,
+        PROPVARIANT *
+    );
+
+    virtual HRESULT STDMETHODCALLTYPE SetPropertyValue(
+        PCWSTR,
+        const PROPERTYKEY &,
+        PROPVARIANT *
+    );
+
+    virtual HRESULT STDMETHODCALLTYPE SetDefaultEndpoint(
+        __in PCWSTR wszDeviceId,
+        __in ERole eRole 
+    );
+
+    virtual HRESULT STDMETHODCALLTYPE SetEndpointVisibility(
+        PCWSTR,
+        INT
+    );  // not available on Windows 7, use method from IPolicyConfig
+};
+
+// ----------------------------------------------------------------------------

plugins/systemvolume/systemvolumeplugin-win.cpp

@@ -18,6 +18,7 @@
 #include <core/device.h>
 
 #include "plugin_systemvolume_debug.h"
+#include "PolicyConfig.h"
 
 K_PLUGIN_CLASS_WITH_JSON(SystemvolumePlugin, "kdeconnect_systemvolume.json")
 
@@ -353,6 +354,50 @@ void SystemvolumePlugin::connected()
     sendSinkList();
 }
 
+static HRESULT setDefaultAudioPlaybackDevice(PCWSTR deviceId) {
+    if (deviceId == nullptr) return ERROR_BAD_UNIT;
+
+    IPolicyConfigVista *pPolicyConfig;
+    HRESULT hr = CoCreateInstance(
+            __uuidof(CPolicyConfigVistaClient),
+            NULL,
+            CLSCTX_ALL,
+            __uuidof(IPolicyConfigVista),
+            (LPVOID *)&pPolicyConfig
+    );
+
+    if (SUCCEEDED(hr))
+    {
+        hr = pPolicyConfig->SetDefaultEndpoint(deviceId, eMultimedia);
+        pPolicyConfig->Release();
+    }
+
+    return hr;
+}
+
+HRESULT SystemvolumePlugin::setDefaultAudioPlaybackDevice(QString& name, bool enabled)
+{
+    if (!enabled) return S_OK;
+
+    PWSTR deviceId = nullptr;
+    for (auto& entry : idToNameMap.toStdMap()) {
+        if (entry.second == name) {
+
+            deviceId = new WCHAR[entry.first.length()];
+            wcscpy(deviceId, entry.first.toStdWString().data());
+            break;
+        }
+    }
+
+    if (deviceId == nullptr) return ERROR_BAD_UNIT;
+
+    HRESULT hr = ::setDefaultAudioPlaybackDevice(deviceId);
+
+    delete[] deviceId;
+
+    return hr;
+}
+
 bool SystemvolumePlugin::receivePacket(const NetworkPacket &np)
 {
     if (!valid)
@@ -376,6 +421,10 @@ bool SystemvolumePlugin::receivePacket(const NetworkPacket &np)
             {
                 sinkList[name].first->SetMute(np.get<bool>(QStringLiteral("muted")), NULL);
             }
+            if (np.has(QStringLiteral("enabled")))
+            {
+                setDefaultAudioPlaybackDevice(name, np.get<bool>(QStringLiteral("enabled")));
+            }
         }
     }
     return true;

plugins/systemvolume/systemvolumeplugin-win.h

@@ -44,6 +44,7 @@ class Q_DECL_EXPORT SystemvolumePlugin : public KdeConnectPlugin
     QMap<QString, QString> idToNameMap;
 
     bool sendSinkList();
+    HRESULT setDefaultAudioPlaybackDevice(QString& name, bool enabled);
 };
 
 #endif // SYSTEMVOLUMEPLUGINWIN_H