gecko/widget/windows/AudioSession.cpp
2012-05-21 12:12:37 +01:00

447 lines
12 KiB
C++

/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
*
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#include <windows.h>
#include <audiopolicy.h>
#include <mmdeviceapi.h>
#include "nsIStringBundle.h"
#include "nsIUUIDGenerator.h"
#include "nsIXULAppInfo.h"
//#include "AudioSession.h"
#include "nsCOMPtr.h"
#include "nsAutoPtr.h"
#include "nsServiceManagerUtils.h"
#include "nsString.h"
#include "nsThreadUtils.h"
#include "nsXULAppAPI.h"
#include <objbase.h>
namespace mozilla {
namespace widget {
/*
* To take advantage of what Vista+ have to offer with respect to audio,
* we need to maintain an audio session. This class wraps IAudioSessionControl
* and implements IAudioSessionEvents (for callbacks from Windows)
*/
class AudioSession: public IAudioSessionEvents {
private:
AudioSession();
~AudioSession();
public:
static AudioSession* GetSingleton();
// COM IUnknown
STDMETHODIMP_(ULONG) AddRef();
STDMETHODIMP QueryInterface(REFIID, void**);
STDMETHODIMP_(ULONG) Release();
// IAudioSessionEvents
STDMETHODIMP OnChannelVolumeChanged(DWORD aChannelCount,
float aChannelVolumeArray[],
DWORD aChangedChannel,
LPCGUID aContext);
STDMETHODIMP OnDisplayNameChanged(LPCWSTR aDisplayName, LPCGUID aContext);
STDMETHODIMP OnGroupingParamChanged(LPCGUID aGroupingParam, LPCGUID aContext);
STDMETHODIMP OnIconPathChanged(LPCWSTR aIconPath, LPCGUID aContext);
STDMETHODIMP OnSessionDisconnected(AudioSessionDisconnectReason aReason);
private:
nsresult OnSessionDisconnectedInternal();
public:
STDMETHODIMP OnSimpleVolumeChanged(float aVolume,
BOOL aMute,
LPCGUID aContext);
STDMETHODIMP OnStateChanged(AudioSessionState aState);
nsresult Start();
nsresult Stop();
void StopInternal();
nsresult GetSessionData(nsID& aID,
nsString& aSessionName,
nsString& aIconPath);
nsresult SetSessionData(const nsID& aID,
const nsString& aSessionName,
const nsString& aIconPath);
enum SessionState {
UNINITIALIZED, // Has not been initialized yet
STARTED, // Started
CLONED, // SetSessionInfoCalled, Start not called
FAILED, // The autdio session failed to start
STOPPED, // Stop called
AUDIO_SESSION_DISCONNECTED // Audio session disconnected
};
protected:
nsRefPtr<IAudioSessionControl> mAudioSessionControl;
nsString mDisplayName;
nsString mIconPath;
nsID mSessionGroupingParameter;
SessionState mState;
nsAutoRefCnt mRefCnt;
NS_DECL_OWNINGTHREAD
static AudioSession* sService;
};
nsresult
StartAudioSession()
{
return AudioSession::GetSingleton()->Start();
}
nsresult
StopAudioSession()
{
return AudioSession::GetSingleton()->Stop();
}
nsresult
GetAudioSessionData(nsID& aID,
nsString& aSessionName,
nsString& aIconPath)
{
return AudioSession::GetSingleton()->GetSessionData(aID,
aSessionName,
aIconPath);
}
nsresult
RecvAudioSessionData(const nsID& aID,
const nsString& aSessionName,
const nsString& aIconPath)
{
return AudioSession::GetSingleton()->SetSessionData(aID,
aSessionName,
aIconPath);
}
AudioSession* AudioSession::sService = NULL;
AudioSession::AudioSession()
{
mState = UNINITIALIZED;
}
AudioSession::~AudioSession()
{
}
AudioSession*
AudioSession::GetSingleton()
{
if (!(AudioSession::sService)) {
nsRefPtr<AudioSession> service = new AudioSession();
service.forget(&AudioSession::sService);
}
// We don't refcount AudioSession on the Gecko side, we hold one single ref
// as long as the appshell is running.
return AudioSession::sService;
}
// It appears Windows will use us on a background thread ...
NS_IMPL_THREADSAFE_ADDREF(AudioSession)
NS_IMPL_THREADSAFE_RELEASE(AudioSession)
STDMETHODIMP
AudioSession::QueryInterface(REFIID iid, void **ppv)
{
const IID IID_IAudioSessionEvents = __uuidof(IAudioSessionEvents);
if ((IID_IUnknown == iid) ||
(IID_IAudioSessionEvents == iid)) {
*ppv = static_cast<IAudioSessionEvents*>(this);
AddRef();
return S_OK;
}
return E_NOINTERFACE;
}
// Once we are started Windows will hold a reference to us through our
// IAudioSessionEvents interface that will keep us alive until the appshell
// calls Stop.
nsresult
AudioSession::Start()
{
NS_ABORT_IF_FALSE(mState == UNINITIALIZED ||
mState == CLONED ||
mState == AUDIO_SESSION_DISCONNECTED,
"State invariants violated");
const CLSID CLSID_MMDeviceEnumerator = __uuidof(MMDeviceEnumerator);
const IID IID_IMMDeviceEnumerator = __uuidof(IMMDeviceEnumerator);
const IID IID_IAudioSessionManager = __uuidof(IAudioSessionManager);
HRESULT hr;
if (FAILED(::CoInitialize(NULL)))
return NS_ERROR_FAILURE;
if (mState == UNINITIALIZED) {
mState = FAILED;
// XXXkhuey implement this for content processes
if (XRE_GetProcessType() == GeckoProcessType_Content)
return NS_ERROR_FAILURE;
NS_ABORT_IF_FALSE(XRE_GetProcessType() == GeckoProcessType_Default,
"Should only get here in a chrome process!");
nsCOMPtr<nsIStringBundleService> bundleService =
do_GetService(NS_STRINGBUNDLE_CONTRACTID);
NS_ENSURE_TRUE(bundleService, NS_ERROR_FAILURE);
nsCOMPtr<nsIStringBundle> bundle;
bundleService->CreateBundle("chrome://branding/locale/brand.properties",
getter_AddRefs(bundle));
NS_ENSURE_TRUE(bundle, NS_ERROR_FAILURE);
bundle->GetStringFromName(NS_LITERAL_STRING("brandFullName").get(),
getter_Copies(mDisplayName));
PRUnichar *buffer;
mIconPath.GetMutableData(&buffer, MAX_PATH);
// XXXkhuey we should provide a way for a xulrunner app to specify an icon
// that's not in the product binary.
::GetModuleFileNameW(NULL, buffer, MAX_PATH);
nsCOMPtr<nsIUUIDGenerator> uuidgen =
do_GetService("@mozilla.org/uuid-generator;1");
NS_ASSERTION(uuidgen, "No UUID-Generator?!?");
uuidgen->GenerateUUIDInPlace(&mSessionGroupingParameter);
}
mState = FAILED;
NS_ABORT_IF_FALSE(!mDisplayName.IsEmpty() || !mIconPath.IsEmpty(),
"Should never happen ...");
nsRefPtr<IMMDeviceEnumerator> enumerator;
hr = ::CoCreateInstance(CLSID_MMDeviceEnumerator,
NULL,
CLSCTX_ALL,
IID_IMMDeviceEnumerator,
getter_AddRefs(enumerator));
if (FAILED(hr))
return NS_ERROR_NOT_AVAILABLE;
nsRefPtr<IMMDevice> device;
hr = enumerator->GetDefaultAudioEndpoint(EDataFlow::eRender,
ERole::eMultimedia,
getter_AddRefs(device));
if (FAILED(hr)) {
if (hr == E_NOTFOUND)
return NS_ERROR_NOT_AVAILABLE;
return NS_ERROR_FAILURE;
}
nsRefPtr<IAudioSessionManager> manager;
hr = device->Activate(IID_IAudioSessionManager,
CLSCTX_ALL,
NULL,
getter_AddRefs(manager));
if (FAILED(hr))
return NS_ERROR_FAILURE;
hr = manager->GetAudioSessionControl(NULL,
FALSE,
getter_AddRefs(mAudioSessionControl));
if (FAILED(hr))
return NS_ERROR_FAILURE;
hr = mAudioSessionControl->SetGroupingParam((LPCGUID)&mSessionGroupingParameter,
NULL);
if (FAILED(hr)) {
StopInternal();
return NS_ERROR_FAILURE;
}
hr = mAudioSessionControl->SetDisplayName(mDisplayName.get(), NULL);
if (FAILED(hr)) {
StopInternal();
return NS_ERROR_FAILURE;
}
hr = mAudioSessionControl->SetIconPath(mIconPath.get(), NULL);
if (FAILED(hr)) {
StopInternal();
return NS_ERROR_FAILURE;
}
hr = mAudioSessionControl->RegisterAudioSessionNotification(this);
if (FAILED(hr)) {
StopInternal();
return NS_ERROR_FAILURE;
}
mState = STARTED;
return NS_OK;
}
void
AudioSession::StopInternal()
{
static const nsID blankId = {0, 0, 0, {0, 0, 0, 0, 0, 0, 0, 0} };
if (mAudioSessionControl) {
mAudioSessionControl->SetGroupingParam((LPCGUID)&blankId, NULL);
mAudioSessionControl->UnregisterAudioSessionNotification(this);
mAudioSessionControl = nsnull;
}
}
nsresult
AudioSession::Stop()
{
NS_ABORT_IF_FALSE(mState == STARTED ||
mState == UNINITIALIZED || // XXXremove this
mState == FAILED,
"State invariants violated");
mState = STOPPED;
nsRefPtr<AudioSession> kungFuDeathGrip;
kungFuDeathGrip.swap(sService);
if (XRE_GetProcessType() != GeckoProcessType_Content)
StopInternal();
// At this point kungFuDeathGrip should be the only reference to AudioSession
::CoUninitialize();
return NS_OK;
}
void CopynsID(nsID& lhs, const nsID& rhs)
{
lhs.m0 = rhs.m0;
lhs.m1 = rhs.m1;
lhs.m2 = rhs.m2;
for (int i = 0; i < 8; i++ ) {
lhs.m3[i] = rhs.m3[i];
}
}
nsresult
AudioSession::GetSessionData(nsID& aID,
nsString& aSessionName,
nsString& aIconPath)
{
NS_ABORT_IF_FALSE(mState == FAILED ||
mState == STARTED ||
mState == CLONED,
"State invariants violated");
CopynsID(aID, mSessionGroupingParameter);
aSessionName = mDisplayName;
aIconPath = mIconPath;
if (mState == FAILED)
return NS_ERROR_FAILURE;
return NS_OK;
}
nsresult
AudioSession::SetSessionData(const nsID& aID,
const nsString& aSessionName,
const nsString& aIconPath)
{
NS_ABORT_IF_FALSE(mState == UNINITIALIZED,
"State invariants violated");
NS_ABORT_IF_FALSE(XRE_GetProcessType() != GeckoProcessType_Default,
"Should never get here in a chrome process!");
mState = CLONED;
CopynsID(mSessionGroupingParameter, aID);
mDisplayName = aSessionName;
mIconPath = aIconPath;
return NS_OK;
}
STDMETHODIMP
AudioSession::OnChannelVolumeChanged(DWORD aChannelCount,
float aChannelVolumeArray[],
DWORD aChangedChannel,
LPCGUID aContext)
{
return S_OK; // NOOP
}
STDMETHODIMP
AudioSession::OnDisplayNameChanged(LPCWSTR aDisplayName,
LPCGUID aContext)
{
return S_OK; // NOOP
}
STDMETHODIMP
AudioSession::OnGroupingParamChanged(LPCGUID aGroupingParam,
LPCGUID aContext)
{
return S_OK; // NOOP
}
STDMETHODIMP
AudioSession::OnIconPathChanged(LPCWSTR aIconPath,
LPCGUID aContext)
{
return S_OK; // NOOP
}
STDMETHODIMP
AudioSession::OnSessionDisconnected(AudioSessionDisconnectReason aReason)
{
// Run our code asynchronously. Per MSDN we can't do anything interesting
// in this callback.
nsCOMPtr<nsIRunnable> runnable =
NS_NewRunnableMethod(this, &AudioSession::OnSessionDisconnectedInternal);
NS_DispatchToMainThread(runnable);
return S_OK;
}
nsresult
AudioSession::OnSessionDisconnectedInternal()
{
if (!mAudioSessionControl)
return NS_OK;
mAudioSessionControl->UnregisterAudioSessionNotification(this);
mAudioSessionControl = nsnull;
mState = AUDIO_SESSION_DISCONNECTED;
CoUninitialize();
Start(); // If it fails there's not much we can do.
return NS_OK;
}
STDMETHODIMP
AudioSession::OnSimpleVolumeChanged(float aVolume,
BOOL aMute,
LPCGUID aContext)
{
return S_OK; // NOOP
}
STDMETHODIMP
AudioSession::OnStateChanged(AudioSessionState aState)
{
return S_OK; // NOOP
}
} // namespace widget
} // namespace mozilla