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/* $Id: VBoxMMNotificationClient.cpp $ */
/** @file
* VBoxMMNotificationClient.cpp - Implementation of the IMMNotificationClient interface
* to detect audio endpoint changes.
*/
/*
* Copyright (C) 2017-2019 Oracle Corporation
*
* This file is part of VirtualBox Open Source Edition (OSE), as
* available from http://www.virtualbox.org. This file is free software;
* you can redistribute it and/or modify it under the terms of the GNU
* General Public License (GPL) as published by the Free Software
* Foundation, in version 2 as it comes in the "COPYING" file of the
* VirtualBox OSE distribution. VirtualBox OSE is distributed in the
* hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
*/
#include "VBoxMMNotificationClient.h"
#include <iprt/win/windows.h>
#pragma warning(push)
#pragma warning(disable: 4201)
#include <mmdeviceapi.h>
#include <endpointvolume.h>
#pragma warning(pop)
#ifdef LOG_GROUP
# undef LOG_GROUP
#endif
#define LOG_GROUP LOG_GROUP_DRV_HOST_AUDIO
#include <VBox/log.h>
VBoxMMNotificationClient::VBoxMMNotificationClient(void)
: m_fRegisteredClient(false)
, m_cRef(1)
{
}
VBoxMMNotificationClient::~VBoxMMNotificationClient(void)
{
}
/**
* Uninitializes the mulitmedia notification client implementation.
*/
void VBoxMMNotificationClient::Dispose(void)
{
DetachFromEndpoint();
if (m_fRegisteredClient)
{
m_pEnum->UnregisterEndpointNotificationCallback(this);
m_fRegisteredClient = false;
}
}
/**
* Initializes the mulitmedia notification client implementation.
*
* @return HRESULT
*/
HRESULT VBoxMMNotificationClient::Initialize(void)
{
HRESULT hr = CoCreateInstance(__uuidof(MMDeviceEnumerator), 0, CLSCTX_ALL, __uuidof(IMMDeviceEnumerator),
(void **)&m_pEnum);
if (SUCCEEDED(hr))
{
hr = m_pEnum->RegisterEndpointNotificationCallback(this);
if (SUCCEEDED(hr))
{
m_fRegisteredClient = true;
hr = AttachToDefaultEndpoint();
}
}
LogFunc(("Returning %Rhrc\n", hr));
return hr;
}
/**
* Registration callback implementation for storing our (required) contexts.
*
* @return IPRT status code.
* @param pDrvIns Driver instance to register the notification client to.
* @param pfnCallback Audio callback to call by the notification client in case of new events.
*/
int VBoxMMNotificationClient::RegisterCallback(PPDMDRVINS pDrvIns, PFNPDMHOSTAUDIOCALLBACK pfnCallback)
{
this->m_pDrvIns = pDrvIns;
this->m_pfnCallback = pfnCallback;
return VINF_SUCCESS;
}
/**
* Unregistration callback implementation for cleaning up our mess when we're done handling
* with notifications.
*/
void VBoxMMNotificationClient::UnregisterCallback(void)
{
this->m_pDrvIns = NULL;
this->m_pfnCallback = NULL;
}
/**
* Stub being called when attaching to the default audio endpoint.
* Does nothing at the moment.
*/
HRESULT VBoxMMNotificationClient::AttachToDefaultEndpoint(void)
{
return S_OK;
}
/**
* Stub being called when detaching from the default audio endpoint.
* Does nothing at the moment.
*/
void VBoxMMNotificationClient::DetachFromEndpoint(void)
{
}
/**
* Handler implementation which is called when an audio device state
* has been changed.
*
* @return HRESULT
* @param pwstrDeviceId Device ID the state is announced for.
* @param dwNewState New state the device is now in.
*/
STDMETHODIMP VBoxMMNotificationClient::OnDeviceStateChanged(LPCWSTR pwstrDeviceId, DWORD dwNewState)
{
char *pszState = "unknown";
switch (dwNewState)
{
case DEVICE_STATE_ACTIVE:
pszState = "active";
break;
case DEVICE_STATE_DISABLED:
pszState = "disabled";
break;
case DEVICE_STATE_NOTPRESENT:
pszState = "not present";
break;
case DEVICE_STATE_UNPLUGGED:
pszState = "unplugged";
break;
default:
break;
}
LogRel2(("Audio: Device '%ls' has changed state to '%s'\n", pwstrDeviceId, pszState));
#ifdef VBOX_WITH_AUDIO_CALLBACKS
AssertPtr(this->m_pDrvIns);
AssertPtr(this->m_pfnCallback);
if (this->m_pfnCallback)
/* Ignore rc */ this->m_pfnCallback(this->m_pDrvIns, PDMAUDIOBACKENDCBTYPE_DEVICES_CHANGED, NULL, 0);
#endif
return S_OK;
}
/**
* Handler implementation which is called when a new audio device has been added.
*
* @return HRESULT
* @param pwstrDeviceId Device ID which has been added.
*/
STDMETHODIMP VBoxMMNotificationClient::OnDeviceAdded(LPCWSTR pwstrDeviceId)
{
RT_NOREF(pwstrDeviceId);
LogFunc(("%ls\n", pwstrDeviceId));
return S_OK;
}
/**
* Handler implementation which is called when an audio device has been removed.
*
* @return HRESULT
* @param pwstrDeviceId Device ID which has been removed.
*/
STDMETHODIMP VBoxMMNotificationClient::OnDeviceRemoved(LPCWSTR pwstrDeviceId)
{
RT_NOREF(pwstrDeviceId);
LogFunc(("%ls\n", pwstrDeviceId));
return S_OK;
}
/**
* Handler implementation which is called when the device audio device has been
* changed.
*
* @return HRESULT
* @param eFlow Flow direction of the new default device.
* @param eRole Role of the new default device.
* @param pwstrDefaultDeviceId ID of the new default device.
*/
STDMETHODIMP VBoxMMNotificationClient::OnDefaultDeviceChanged(EDataFlow eFlow, ERole eRole, LPCWSTR pwstrDefaultDeviceId)
{
RT_NOREF(eFlow, eRole, pwstrDefaultDeviceId);
if (eFlow == eRender)
{
}
return S_OK;
}
STDMETHODIMP VBoxMMNotificationClient::QueryInterface(REFIID interfaceID, void **ppvInterface)
{
const IID IID_IMMNotificationClient = __uuidof(IMMNotificationClient);
if ( IsEqualIID(interfaceID, IID_IUnknown)
|| IsEqualIID(interfaceID, IID_IMMNotificationClient))
{
*ppvInterface = static_cast<IMMNotificationClient*>(this);
AddRef();
return S_OK;
}
*ppvInterface = NULL;
return E_NOINTERFACE;
}
STDMETHODIMP_(ULONG) VBoxMMNotificationClient::AddRef(void)
{
return InterlockedIncrement(&m_cRef);
}
STDMETHODIMP_(ULONG) VBoxMMNotificationClient::Release(void)
{
long lRef = InterlockedDecrement(&m_cRef);
if (lRef == 0)
delete this;
return lRef;
}
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