The Tor Browser: dom/fmradio/FMRadio.cpp@6474c204b198 (annotated)

dom/fmradio/FMRadio.cpp@6474c204b198 (annotated)

dom/fmradio/FMRadio.cpp

Wed, 31 Dec 2014 06:09:35 +0100

author: Michael Schloh von Bennewitz <michael@schloh.com>
date: Wed, 31 Dec 2014 06:09:35 +0100
changeset 0: 6474c204b198
permissions: -rw-r--r--

Cloned upstream origin tor-browser at tor-browser-31.3.0esr-4.5-1-build1
revision ID fc1c9ff7c1b2defdbc039f12214767608f46423f for hacking purpose.

 /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
 /* vim:set ts=2 sw=2 sts=2 et cindent: */
 /* 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 "mozilla/dom/FMRadio.h"
 #include "nsContentUtils.h"
 #include "mozilla/Hal.h"
 #include "mozilla/HalTypes.h"
 #include "mozilla/Preferences.h"
 #include "mozilla/dom/FMRadioBinding.h"
 #include "mozilla/dom/ContentChild.h"
 #include "mozilla/dom/PFMRadioChild.h"
 #include "mozilla/dom/FMRadioService.h"
 #include "DOMRequest.h"
 #include "nsDOMClassInfo.h"
 #include "nsIDocShell.h"
 #include "nsIInterfaceRequestorUtils.h"
 #include "nsIAudioManager.h"
 #undef LOG
 #define LOG(args...) FM_LOG("FMRadio", args)
 // The pref indicates if the device has an internal antenna.
 // If the pref is true, the antanna will be always available.
 #define DOM_FM_ANTENNA_INTERNAL_PREF "dom.fmradio.antenna.internal"
 using namespace mozilla::hal;
 using mozilla::Preferences;
 BEGIN_FMRADIO_NAMESPACE
 class FMRadioRequest MOZ_FINAL : public FMRadioReplyRunnable
                                , public DOMRequest
 {
 public:
   NS_DECL_ISUPPORTS_INHERITED
   FMRadioRequest(nsPIDOMWindow* aWindow, FMRadio* aFMRadio)
     : DOMRequest(aWindow)
     , mType(FMRadioRequestArgs::T__None)
   {
     // |FMRadio| inherits from |nsIDOMEventTarget| and |nsISupportsWeakReference|
     // which both inherits from nsISupports, so |nsISupports| is an ambiguous
     // base of |FMRadio|, we have to cast |aFMRadio| to one of the base classes.
     mFMRadio = do_GetWeakReference(static_cast<nsIDOMEventTarget*>(aFMRadio));
   }
   FMRadioRequest(nsPIDOMWindow* aWindow, FMRadio* aFMRadio,
     FMRadioRequestArgs::Type aType)
     : DOMRequest(aWindow)
   {
     MOZ_ASSERT(aType >= FMRadioRequestArgs::T__None &&
                aType <= FMRadioRequestArgs::T__Last,
                "Wrong FMRadioRequestArgs in FMRadioRequest");
     mFMRadio = do_GetWeakReference(static_cast<nsIDOMEventTarget*>(aFMRadio));
     mType = aType;
   }
   ~FMRadioRequest() { }
   NS_IMETHODIMP
   Run()
   {
     MOZ_ASSERT(NS_IsMainThread(), "Wrong thread!");
     nsCOMPtr<nsIDOMEventTarget> target = do_QueryReferent(mFMRadio);
     if (!target) {
       return NS_OK;
     }
     FMRadio* fmRadio = static_cast<FMRadio*>(
       static_cast<nsIDOMEventTarget*>(target));
     if (fmRadio->mIsShutdown) {
       return NS_OK;
     }
     switch (mResponseType.type()) {
       case FMRadioResponseType::TErrorResponse:
         FireError(mResponseType.get_ErrorResponse().error());
         break;
       case FMRadioResponseType::TSuccessResponse:
         if (mType == FMRadioRequestArgs::TEnableRequestArgs) {
           fmRadio->EnableAudioChannelAgent();
         }
         FireSuccess(JS::UndefinedHandleValue);
         break;
       default:
         MOZ_CRASH();
     }
     return NS_OK;
   }
 private:
   FMRadioRequestArgs::Type mType;
   nsWeakPtr mFMRadio;
 };
 NS_IMPL_ISUPPORTS_INHERITED0(FMRadioRequest, DOMRequest)
 FMRadio::FMRadio()
   : mHeadphoneState(SWITCH_STATE_OFF)
   , mAudioChannelAgentEnabled(false)
   , mHasInternalAntenna(false)
   , mIsShutdown(false)
 {
   LOG("FMRadio is initialized.");
   SetIsDOMBinding();
 }
 FMRadio::~FMRadio()
 {
 }
 void
 FMRadio::Init(nsPIDOMWindow *aWindow)
 {
   BindToOwner(aWindow);
   IFMRadioService::Singleton()->AddObserver(this);
   mHasInternalAntenna = Preferences::GetBool(DOM_FM_ANTENNA_INTERNAL_PREF,
                                              /* default = */ false);
   if (mHasInternalAntenna) {
     LOG("We have an internal antenna.");
   } else {
     mHeadphoneState = GetCurrentSwitchState(SWITCH_HEADPHONES);
     RegisterSwitchObserver(SWITCH_HEADPHONES, this);
   }
   nsCOMPtr<nsIDOMEventTarget> target = do_QueryInterface(GetOwner());
   NS_ENSURE_TRUE_VOID(target);
   target->AddSystemEventListener(NS_LITERAL_STRING("visibilitychange"), this,
                                  /* useCapture = */ true,
                                  /* wantsUntrusted = */ false);
   // All of the codes below are for AudioChannel. We can directly return here
   // if preferences doesn't enable AudioChannelService.
   NS_ENSURE_TRUE_VOID(Preferences::GetBool("media.useAudioChannelService"));
   nsCOMPtr<nsIAudioChannelAgent> audioChannelAgent =
     do_CreateInstance("@mozilla.org/audiochannelagent;1");
   NS_ENSURE_TRUE_VOID(audioChannelAgent);
   audioChannelAgent->InitWithWeakCallback(
     GetOwner(),
     nsIAudioChannelAgent::AUDIO_AGENT_CHANNEL_CONTENT,
     this);
   nsCOMPtr<nsIDocShell> docshell = do_GetInterface(GetOwner());
   NS_ENSURE_TRUE_VOID(docshell);
   bool isActive = false;
   docshell->GetIsActive(&isActive);
   audioChannelAgent->SetVisibilityState(isActive);
   // Once all necessary resources are got successfully, we just enabled
   // mAudioChannelAgent.
   mAudioChannelAgent = audioChannelAgent;
 }
 void
 FMRadio::Shutdown()
 {
   IFMRadioService::Singleton()->RemoveObserver(this);
   if (!mHasInternalAntenna) {
     UnregisterSwitchObserver(SWITCH_HEADPHONES, this);
   }
   nsCOMPtr<nsIDOMEventTarget> target = do_QueryInterface(GetOwner());
   NS_ENSURE_TRUE_VOID(target);
   target->RemoveSystemEventListener(NS_LITERAL_STRING("visibilitychange"), this,
                                     /* useCapture = */ true);
   mIsShutdown = true;
 }
 JSObject*
 FMRadio::WrapObject(JSContext* aCx)
 {
   return FMRadioBinding::Wrap(aCx, this);
 }
 void
 FMRadio::Notify(const SwitchEvent& aEvent)
 {
   MOZ_ASSERT(!mHasInternalAntenna);
   if (mHeadphoneState != aEvent.status()) {
     mHeadphoneState = aEvent.status();
     DispatchTrustedEvent(NS_LITERAL_STRING("antennaavailablechange"));
   }
 }
 void
 FMRadio::Notify(const FMRadioEventType& aType)
 {
   switch (aType) {
     case FrequencyChanged:
       DispatchTrustedEvent(NS_LITERAL_STRING("frequencychange"));
       break;
     case EnabledChanged:
       if (Enabled()) {
         DispatchTrustedEvent(NS_LITERAL_STRING("enabled"));
       } else {
         if (mAudioChannelAgentEnabled) {
           mAudioChannelAgent->StopPlaying();
           mAudioChannelAgentEnabled = false;
         }
         DispatchTrustedEvent(NS_LITERAL_STRING("disabled"));
       }
       break;
     default:
       MOZ_CRASH();
   }
 }
 /* static */
 bool
 FMRadio::Enabled()
 {
   return IFMRadioService::Singleton()->IsEnabled();
 }
 bool
 FMRadio::AntennaAvailable() const
 {
   return mHasInternalAntenna ? true : (mHeadphoneState != SWITCH_STATE_OFF) &&
     (mHeadphoneState != SWITCH_STATE_UNKNOWN);
 }
 Nullable<double>
 FMRadio::GetFrequency() const
 {
   return Enabled() ?
     Nullable<double>(IFMRadioService::Singleton()->GetFrequency()) :
     Nullable<double>();
 }
 double
 FMRadio::FrequencyUpperBound() const
 {
   return IFMRadioService::Singleton()->GetFrequencyUpperBound();
 }
 double
 FMRadio::FrequencyLowerBound() const
 {
   return IFMRadioService::Singleton()->GetFrequencyLowerBound();
 }
 double
 FMRadio::ChannelWidth() const
 {
   return IFMRadioService::Singleton()->GetChannelWidth();
 }
 already_AddRefed<DOMRequest>
 FMRadio::Enable(double aFrequency)
 {
   nsCOMPtr<nsPIDOMWindow> win = GetOwner();
   if (!win) {
     return nullptr;
   }
   nsRefPtr<FMRadioRequest> r =
     new FMRadioRequest(win, this, FMRadioRequestArgs::TEnableRequestArgs);
   IFMRadioService::Singleton()->Enable(aFrequency, r);
   return r.forget();
 }
 already_AddRefed<DOMRequest>
 FMRadio::Disable()
 {
   nsCOMPtr<nsPIDOMWindow> win = GetOwner();
   if (!win) {
     return nullptr;
   }
   nsRefPtr<FMRadioRequest> r = new FMRadioRequest(win, this);
   IFMRadioService::Singleton()->Disable(r);
   return r.forget();
 }
 already_AddRefed<DOMRequest>
 FMRadio::SetFrequency(double aFrequency)
 {
   nsCOMPtr<nsPIDOMWindow> win = GetOwner();
   if (!win) {
     return nullptr;
   }
   nsRefPtr<FMRadioRequest> r = new FMRadioRequest(win, this);
   IFMRadioService::Singleton()->SetFrequency(aFrequency, r);
   return r.forget();
 }
 already_AddRefed<DOMRequest>
 FMRadio::SeekUp()
 {
   nsCOMPtr<nsPIDOMWindow> win = GetOwner();
   if (!win) {
     return nullptr;
   }
   nsRefPtr<FMRadioRequest> r = new FMRadioRequest(win, this);
   IFMRadioService::Singleton()->Seek(FM_RADIO_SEEK_DIRECTION_UP, r);
   return r.forget();
 }
 already_AddRefed<DOMRequest>
 FMRadio::SeekDown()
 {
   nsCOMPtr<nsPIDOMWindow> win = GetOwner();
   if (!win) {
     return nullptr;
   }
   nsRefPtr<FMRadioRequest> r = new FMRadioRequest(win, this);
   IFMRadioService::Singleton()->Seek(FM_RADIO_SEEK_DIRECTION_DOWN, r);
   return r.forget();
 }
 already_AddRefed<DOMRequest>
 FMRadio::CancelSeek()
 {
   nsCOMPtr<nsPIDOMWindow> win = GetOwner();
   if (!win) {
     return nullptr;
   }
   nsRefPtr<FMRadioRequest> r = new FMRadioRequest(win, this);
   IFMRadioService::Singleton()->CancelSeek(r);
   return r.forget();
 }
 NS_IMETHODIMP
 FMRadio::HandleEvent(nsIDOMEvent* aEvent)
 {
   nsAutoString type;
   aEvent->GetType(type);
   if (!type.EqualsLiteral("visibilitychange")) {
     return NS_ERROR_FAILURE;
   }
   nsCOMPtr<nsIDocShell> docshell = do_GetInterface(GetOwner());
   NS_ENSURE_TRUE(docshell, NS_ERROR_FAILURE);
   bool isActive = false;
   docshell->GetIsActive(&isActive);
   mAudioChannelAgent->SetVisibilityState(isActive);
   return NS_OK;
 }
 void
 FMRadio::EnableAudioChannelAgent()
 {
   NS_ENSURE_TRUE_VOID(mAudioChannelAgent);
   int32_t playingState = 0;
   mAudioChannelAgent->StartPlaying(&playingState);
   SetCanPlay(playingState == AudioChannelState::AUDIO_CHANNEL_STATE_NORMAL);
   mAudioChannelAgentEnabled = true;
 }
 NS_IMETHODIMP
 FMRadio::CanPlayChanged(int32_t aCanPlay)
 {
   SetCanPlay(aCanPlay == AudioChannelState::AUDIO_CHANNEL_STATE_NORMAL);
   return NS_OK;
 }
 NS_IMETHODIMP
 FMRadio::WindowVolumeChanged()
 {
   return NS_ERROR_NOT_IMPLEMENTED;
 }
 void
 FMRadio::SetCanPlay(bool aCanPlay)
 {
   IFMRadioService::Singleton()->EnableAudio(aCanPlay);
 }
 NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION_INHERITED(FMRadio)
   NS_INTERFACE_MAP_ENTRY(nsISupportsWeakReference)
   NS_INTERFACE_MAP_ENTRY(nsIAudioChannelAgentCallback)
   NS_INTERFACE_MAP_ENTRY(nsIDOMEventListener)
 NS_INTERFACE_MAP_END_INHERITING(DOMEventTargetHelper)
 NS_IMPL_ADDREF_INHERITED(FMRadio, DOMEventTargetHelper)
 NS_IMPL_RELEASE_INHERITED(FMRadio, DOMEventTargetHelper)
 END_FMRADIO_NAMESPACE

The Tor Browser / annotate

dom/fmradio/FMRadio.cpp@6474c204b198 (annotated)

dom/fmradio/FMRadio.cpp