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gecko-dev/dom/fmradio/FMRadioService.cpp

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/* -*- Mode: c++; c-basic-offset: 2; indent-tabs-mode: nil; tab-width: 40 -*- */
/* vim: set ts=2 et sw=2 tw=80: */
/* 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 "FMRadioService.h"
#include "mozilla/Hal.h"
#include "mozilla/ClearOnShutdown.h"
#include "nsIAudioManager.h"
#include "AudioManager.h"
#include "nsDOMClassInfo.h"
#include "mozilla/Preferences.h"
#include "mozilla/dom/FMRadioChild.h"
#include "nsIObserverService.h"
#include "nsISettingsService.h"
#include "nsJSUtils.h"
#include "nsCxPusher.h"
#define BAND_87500_108000_kHz 1
#define BAND_76000_108000_kHz 2
#define BAND_76000_90000_kHz 3
#define MOZSETTINGS_CHANGED_ID "mozsettings-changed"
#define SETTING_KEY_AIRPLANEMODE_ENABLED "airplaneMode.enabled"
using namespace mozilla::hal;
using mozilla::Preferences;
BEGIN_FMRADIO_NAMESPACE
// static
IFMRadioService*
IFMRadioService::Singleton()
{
if (XRE_GetProcessType() != GeckoProcessType_Default) {
return FMRadioChild::Singleton();
} else {
return FMRadioService::Singleton();
}
}
StaticRefPtr<FMRadioService> FMRadioService::sFMRadioService;
FMRadioService::FMRadioService()
: mPendingFrequencyInKHz(0)
, mState(Disabled)
, mHasReadAirplaneModeSetting(false)
, mAirplaneModeEnabled(false)
, mPendingRequest(nullptr)
, mObserverList(FMRadioEventObserverList())
{
// Read power state and frequency from Hal.
mEnabled = IsFMRadioOn();
if (mEnabled) {
mPendingFrequencyInKHz = GetFMRadioFrequency();
SetState(Enabled);
}
switch (Preferences::GetInt("dom.fmradio.band", BAND_87500_108000_kHz)) {
case BAND_76000_90000_kHz:
mUpperBoundInKHz = 90000;
mLowerBoundInKHz = 76000;
break;
case BAND_76000_108000_kHz:
mUpperBoundInKHz = 108000;
mLowerBoundInKHz = 76000;
break;
case BAND_87500_108000_kHz:
default:
mUpperBoundInKHz = 108000;
mLowerBoundInKHz = 87500;
break;
}
mChannelWidthInKHz = Preferences::GetInt("dom.fmradio.channelWidth", 100);
switch (mChannelWidthInKHz) {
case 50:
case 100:
case 200:
break;
default:
NS_WARNING("Invalid channel width specified in dom.fmradio.channelwidth");
mChannelWidthInKHz = 100;
break;
}
mPreemphasis = Preferences::GetInt("dom.fmradio.preemphasis", 50);
switch (mPreemphasis) {
// values in microseconds
case 0:
case 50:
case 75:
break;
default:
NS_WARNING("Invalid preemphasis specified in dom.fmradio.preemphasis");
mPreemphasis = 50;
break;
}
nsCOMPtr<nsIObserverService> obs = services::GetObserverService();
if (obs && NS_FAILED(obs->AddObserver(this,
MOZSETTINGS_CHANGED_ID,
/* useWeak */ false))) {
NS_WARNING("Failed to add settings change observer!");
}
RegisterFMRadioObserver(this);
}
FMRadioService::~FMRadioService()
{
UnregisterFMRadioObserver(this);
}
class EnableRunnable MOZ_FINAL : public nsRunnable
{
public:
EnableRunnable(uint32_t aUpperLimit, uint32_t aLowerLimit, uint32_t aSpaceType, uint32_t aPreemphasis)
: mUpperLimit(aUpperLimit)
, mLowerLimit(aLowerLimit)
, mSpaceType(aSpaceType)
, mPreemphasis(aPreemphasis)
{
}
NS_IMETHOD Run()
{
FMRadioSettings info;
info.upperLimit() = mUpperLimit;
info.lowerLimit() = mLowerLimit;
info.spaceType() = mSpaceType;
info.preEmphasis() = mPreemphasis;
EnableFMRadio(info);
FMRadioService* fmRadioService = FMRadioService::Singleton();
if (!fmRadioService->mTuneThread) {
// SeekRunnable and SetFrequencyRunnable run on this thread.
// These call ioctls that can stall the main thread, so we run them here.
NS_NewNamedThread("FM Tuning", getter_AddRefs(fmRadioService->mTuneThread));
}
return NS_OK;
}
private:
uint32_t mUpperLimit;
uint32_t mLowerLimit;
uint32_t mSpaceType;
uint32_t mPreemphasis;
};
/**
* Read the airplane-mode setting, if the airplane-mode is not enabled, we
* enable the FM radio.
*/
class ReadAirplaneModeSettingTask MOZ_FINAL : public nsISettingsServiceCallback
{
public:
NS_DECL_ISUPPORTS
ReadAirplaneModeSettingTask(nsRefPtr<FMRadioReplyRunnable> aPendingRequest)
: mPendingRequest(aPendingRequest) { }
NS_IMETHOD
Handle(const nsAString& aName, JS::Handle<JS::Value> aResult)
{
FMRadioService* fmRadioService = FMRadioService::Singleton();
MOZ_ASSERT(mPendingRequest == fmRadioService->mPendingRequest);
fmRadioService->mHasReadAirplaneModeSetting = true;
if (!aResult.isBoolean()) {
// Failed to read the setting value, set the state back to Disabled.
fmRadioService->TransitionState(
ErrorResponse(NS_LITERAL_STRING("Unexpected error")), Disabled);
return NS_OK;
}
fmRadioService->mAirplaneModeEnabled = aResult.toBoolean();
if (!fmRadioService->mAirplaneModeEnabled) {
EnableRunnable* runnable =
new EnableRunnable(fmRadioService->mUpperBoundInKHz,
fmRadioService->mLowerBoundInKHz,
fmRadioService->mChannelWidthInKHz,
fmRadioService->mPreemphasis);
NS_DispatchToMainThread(runnable);
} else {
// Airplane mode is enabled, set the state back to Disabled.
fmRadioService->TransitionState(ErrorResponse(
NS_LITERAL_STRING("Airplane mode currently enabled")), Disabled);
}
return NS_OK;
}
NS_IMETHOD
HandleError(const nsAString& aName)
{
FMRadioService* fmRadioService = FMRadioService::Singleton();
MOZ_ASSERT(mPendingRequest == fmRadioService->mPendingRequest);
fmRadioService->TransitionState(ErrorResponse(
NS_LITERAL_STRING("Unexpected error")), Disabled);
return NS_OK;
}
private:
nsRefPtr<FMRadioReplyRunnable> mPendingRequest;
};
NS_IMPL_ISUPPORTS(ReadAirplaneModeSettingTask, nsISettingsServiceCallback)
class DisableRunnable MOZ_FINAL : public nsRunnable
{
public:
DisableRunnable() { }
NS_IMETHOD Run()
{
FMRadioService* fmRadioService = FMRadioService::Singleton();
if (fmRadioService->mTuneThread) {
fmRadioService->mTuneThread->Shutdown();
fmRadioService->mTuneThread = nullptr;
}
// Fix Bug 796733. DisableFMRadio should be called before
// SetFmRadioAudioEnabled to prevent the annoying beep sound.
DisableFMRadio();
fmRadioService->EnableAudio(false);
return NS_OK;
}
};
class SetFrequencyRunnable MOZ_FINAL : public nsRunnable
{
public:
SetFrequencyRunnable(int32_t aFrequency)
: mFrequency(aFrequency) { }
NS_IMETHOD Run()
{
SetFMRadioFrequency(mFrequency);
return NS_OK;
}
private:
int32_t mFrequency;
};
class SeekRunnable MOZ_FINAL : public nsRunnable
{
public:
SeekRunnable(FMRadioSeekDirection aDirection) : mDirection(aDirection) { }
NS_IMETHOD Run()
{
switch (mDirection) {
case FM_RADIO_SEEK_DIRECTION_UP:
case FM_RADIO_SEEK_DIRECTION_DOWN:
FMRadioSeek(mDirection);
break;
default:
MOZ_CRASH();
}
return NS_OK;
}
private:
FMRadioSeekDirection mDirection;
};
void
FMRadioService::TransitionState(const FMRadioResponseType& aResponse,
FMRadioState aState)
{
if (mPendingRequest) {
mPendingRequest->SetReply(aResponse);
NS_DispatchToMainThread(mPendingRequest);
}
SetState(aState);
}
void
FMRadioService::SetState(FMRadioState aState)
{
mState = aState;
mPendingRequest = nullptr;
}
void
FMRadioService::AddObserver(FMRadioEventObserver* aObserver)
{
MOZ_ASSERT(NS_IsMainThread(), "Wrong thread!");
mObserverList.AddObserver(aObserver);
}
void
FMRadioService::RemoveObserver(FMRadioEventObserver* aObserver)
{
MOZ_ASSERT(NS_IsMainThread(), "Wrong thread!");
mObserverList.RemoveObserver(aObserver);
if (mObserverList.Length() == 0)
{
// Turning off the FM radio HW because observer list is empty.
if (IsFMRadioOn()) {
DoDisable();
}
}
}
void
FMRadioService::EnableAudio(bool aAudioEnabled)
{
MOZ_ASSERT(NS_IsMainThread(), "Wrong thread!");
nsCOMPtr<nsIAudioManager> audioManager =
do_GetService("@mozilla.org/telephony/audiomanager;1");
if (!audioManager) {
return;
}
bool audioEnabled;
audioManager->GetFmRadioAudioEnabled(&audioEnabled);
if (audioEnabled != aAudioEnabled) {
audioManager->SetFmRadioAudioEnabled(aAudioEnabled);
}
}
/**
* Round the frequency to match the range of frequency and the channel width. If
* the given frequency is out of range, return 0. For example:
* - lower: 87500KHz, upper: 108000KHz, channel width: 200KHz
* 87.6MHz is rounded to 87700KHz
* 87.58MHz is rounded to 87500KHz
* 87.49MHz is rounded to 87500KHz
* 109MHz is not rounded, 0 will be returned
*
* We take frequency in MHz to prevent precision losing, and return rounded
* value in KHz for Gonk using.
*/
int32_t
FMRadioService::RoundFrequency(double aFrequencyInMHz)
{
double halfChannelWidthInMHz = mChannelWidthInKHz / 1000.0 / 2;
// Make sure 87.49999MHz would be rounded to the lower bound when
// the lower bound is 87500KHz.
if (aFrequencyInMHz < mLowerBoundInKHz / 1000.0 - halfChannelWidthInMHz ||
aFrequencyInMHz > mUpperBoundInKHz / 1000.0 + halfChannelWidthInMHz) {
return 0;
}
int32_t partToBeRounded = round(aFrequencyInMHz * 1000) - mLowerBoundInKHz;
int32_t roundedPart = round(partToBeRounded / (double)mChannelWidthInKHz) *
mChannelWidthInKHz;
return mLowerBoundInKHz + roundedPart;
}
bool
FMRadioService::IsEnabled() const
{
MOZ_ASSERT(NS_IsMainThread(), "Wrong thread!");
return IsFMRadioOn();
}
double
FMRadioService::GetFrequency() const
{
MOZ_ASSERT(NS_IsMainThread(), "Wrong thread!");
if (IsEnabled()) {
int32_t frequencyInKHz = GetFMRadioFrequency();
return frequencyInKHz / 1000.0;
}
return 0;
}
double
FMRadioService::GetFrequencyUpperBound() const
{
MOZ_ASSERT(NS_IsMainThread(), "Wrong thread!");
return mUpperBoundInKHz / 1000.0;
}
double
FMRadioService::GetFrequencyLowerBound() const
{
MOZ_ASSERT(NS_IsMainThread(), "Wrong thread!");
return mLowerBoundInKHz / 1000.0;
}
double
FMRadioService::GetChannelWidth() const
{
MOZ_ASSERT(NS_IsMainThread(), "Wrong thread!");
return mChannelWidthInKHz / 1000.0;
}
void
FMRadioService::Enable(double aFrequencyInMHz,
FMRadioReplyRunnable* aReplyRunnable)
{
MOZ_ASSERT(NS_IsMainThread(), "Wrong thread!");
MOZ_ASSERT(aReplyRunnable);
switch (mState) {
case Seeking:
case Enabled:
aReplyRunnable->SetReply(
ErrorResponse(NS_LITERAL_STRING("FM radio currently enabled")));
NS_DispatchToMainThread(aReplyRunnable);
return;
case Disabling:
aReplyRunnable->SetReply(
ErrorResponse(NS_LITERAL_STRING("FM radio currently disabling")));
NS_DispatchToMainThread(aReplyRunnable);
return;
case Enabling:
aReplyRunnable->SetReply(
ErrorResponse(NS_LITERAL_STRING("FM radio currently enabling")));
NS_DispatchToMainThread(aReplyRunnable);
return;
case Disabled:
break;
}
int32_t roundedFrequency = RoundFrequency(aFrequencyInMHz);
if (!roundedFrequency) {
aReplyRunnable->SetReply(ErrorResponse(
NS_LITERAL_STRING("Frequency is out of range")));
NS_DispatchToMainThread(aReplyRunnable);
return;
}
if (mHasReadAirplaneModeSetting && mAirplaneModeEnabled) {
aReplyRunnable->SetReply(ErrorResponse(
NS_LITERAL_STRING("Airplane mode currently enabled")));
NS_DispatchToMainThread(aReplyRunnable);
return;
}
SetState(Enabling);
// Cache the enable request just in case disable() is called
// while the FM radio HW is being enabled.
mPendingRequest = aReplyRunnable;
// Cache the frequency value, and set it after the FM radio HW is enabled
mPendingFrequencyInKHz = roundedFrequency;
if (!mHasReadAirplaneModeSetting) {
nsCOMPtr<nsISettingsService> settings =
do_GetService("@mozilla.org/settingsService;1");
nsCOMPtr<nsISettingsServiceLock> settingsLock;
nsresult rv = settings->CreateLock(nullptr, getter_AddRefs(settingsLock));
if (NS_FAILED(rv)) {
TransitionState(ErrorResponse(
NS_LITERAL_STRING("Can't create settings lock")), Disabled);
return;
}
nsRefPtr<ReadAirplaneModeSettingTask> callback =
new ReadAirplaneModeSettingTask(mPendingRequest);
rv = settingsLock->Get(SETTING_KEY_AIRPLANEMODE_ENABLED, callback);
if (NS_FAILED(rv)) {
TransitionState(ErrorResponse(
NS_LITERAL_STRING("Can't get settings lock")), Disabled);
}
return;
}
NS_DispatchToMainThread(new EnableRunnable(mUpperBoundInKHz,
mLowerBoundInKHz,
mChannelWidthInKHz,
mPreemphasis));
}
void
FMRadioService::Disable(FMRadioReplyRunnable* aReplyRunnable)
{
// When airplane-mode is enabled, we will call this function from
// FMRadioService::Observe without passing a FMRadioReplyRunnable,
// so we have to check if |aReplyRunnable| is null before we dispatch it.
MOZ_ASSERT(NS_IsMainThread(), "Wrong thread!");
switch (mState) {
case Disabling:
if (aReplyRunnable) {
aReplyRunnable->SetReply(
ErrorResponse(NS_LITERAL_STRING("FM radio currently disabling")));
NS_DispatchToMainThread(aReplyRunnable);
}
return;
case Disabled:
if (aReplyRunnable) {
aReplyRunnable->SetReply(
ErrorResponse(NS_LITERAL_STRING("FM radio currently disabled")));
NS_DispatchToMainThread(aReplyRunnable);
}
return;
case Enabled:
case Enabling:
case Seeking:
break;
}
nsRefPtr<FMRadioReplyRunnable> enablingRequest = mPendingRequest;
// If the FM Radio is currently seeking, no fail-to-seek or similar
// event will be fired, execute the seek callback manually.
if (mState == Seeking) {
TransitionState(ErrorResponse(
NS_LITERAL_STRING("Seek action is cancelled")), Disabling);
}
FMRadioState preState = mState;
SetState(Disabling);
mPendingRequest = aReplyRunnable;
if (preState == Enabling) {
// If the radio is currently enabling, we fire the error callback on the
// enable request immediately. When the radio finishes enabling, we'll call
// DoDisable and fire the success callback on the disable request.
enablingRequest->SetReply(
ErrorResponse(NS_LITERAL_STRING("Enable action is cancelled")));
NS_DispatchToMainThread(enablingRequest);
// If we haven't read the airplane mode settings yet we won't enable the
// FM radio HW, so fail the disable request immediately.
if (!mHasReadAirplaneModeSetting) {
SetState(Disabled);
if (aReplyRunnable) {
aReplyRunnable->SetReply(SuccessResponse());
NS_DispatchToMainThread(aReplyRunnable);
}
}
return;
}
DoDisable();
}
void
FMRadioService::DoDisable()
{
// To make such codes work:
// navigator.mozFMRadio.disable();
// navigator.mozFMRadio.ondisabled = function() {
// console.log("We will catch disabled event ");
// };
// we need to call hal::DisableFMRadio() asynchronously. Same reason for
// EnableRunnable and SetFrequencyRunnable.
NS_DispatchToMainThread(new DisableRunnable());
}
void
FMRadioService::SetFrequency(double aFrequencyInMHz,
FMRadioReplyRunnable* aReplyRunnable)
{
MOZ_ASSERT(NS_IsMainThread(), "Wrong thread!");
MOZ_ASSERT(aReplyRunnable);
switch (mState) {
case Disabled:
aReplyRunnable->SetReply(
ErrorResponse(NS_LITERAL_STRING("FM radio currently disabled")));
NS_DispatchToMainThread(aReplyRunnable);
return;
case Enabling:
aReplyRunnable->SetReply(
ErrorResponse(NS_LITERAL_STRING("FM radio currently enabling")));
NS_DispatchToMainThread(aReplyRunnable);
return;
case Disabling:
aReplyRunnable->SetReply(
ErrorResponse(NS_LITERAL_STRING("FM radio currently disabling")));
NS_DispatchToMainThread(aReplyRunnable);
return;
case Seeking:
CancelFMRadioSeek();
TransitionState(ErrorResponse(
NS_LITERAL_STRING("Seek action is cancelled")), Enabled);
break;
case Enabled:
break;
}
int32_t roundedFrequency = RoundFrequency(aFrequencyInMHz);
if (!roundedFrequency) {
aReplyRunnable->SetReply(ErrorResponse(
NS_LITERAL_STRING("Frequency is out of range")));
NS_DispatchToMainThread(aReplyRunnable);
return;
}
mTuneThread->Dispatch(new SetFrequencyRunnable(roundedFrequency),
nsIThread::DISPATCH_NORMAL);
aReplyRunnable->SetReply(SuccessResponse());
NS_DispatchToMainThread(aReplyRunnable);
}
void
FMRadioService::Seek(FMRadioSeekDirection aDirection,
FMRadioReplyRunnable* aReplyRunnable)
{
MOZ_ASSERT(NS_IsMainThread(), "Wrong thread!");
MOZ_ASSERT(aReplyRunnable);
switch (mState) {
case Enabling:
aReplyRunnable->SetReply(
ErrorResponse(NS_LITERAL_STRING("FM radio currently enabling")));
NS_DispatchToMainThread(aReplyRunnable);
return;
case Disabled:
aReplyRunnable->SetReply(
ErrorResponse(NS_LITERAL_STRING("FM radio currently disabled")));
NS_DispatchToMainThread(aReplyRunnable);
return;
case Seeking:
aReplyRunnable->SetReply(
ErrorResponse(NS_LITERAL_STRING("FM radio currently seeking")));
NS_DispatchToMainThread(aReplyRunnable);
return;
case Disabling:
aReplyRunnable->SetReply(
ErrorResponse(NS_LITERAL_STRING("FM radio currently disabling")));
NS_DispatchToMainThread(aReplyRunnable);
return;
case Enabled:
break;
}
SetState(Seeking);
mPendingRequest = aReplyRunnable;
mTuneThread->Dispatch(new SeekRunnable(aDirection), nsIThread::DISPATCH_NORMAL);
}
void
FMRadioService::CancelSeek(FMRadioReplyRunnable* aReplyRunnable)
{
MOZ_ASSERT(NS_IsMainThread(), "Wrong thread!");
MOZ_ASSERT(aReplyRunnable);
// We accept canceling seek request only if it's currently seeking.
if (mState != Seeking) {
aReplyRunnable->SetReply(
ErrorResponse(NS_LITERAL_STRING("FM radio currently not seeking")));
NS_DispatchToMainThread(aReplyRunnable);
return;
}
// Cancel the seek immediately to prevent it from completing.
CancelFMRadioSeek();
TransitionState(
ErrorResponse(NS_LITERAL_STRING("Seek action is cancelled")), Enabled);
aReplyRunnable->SetReply(SuccessResponse());
NS_DispatchToMainThread(aReplyRunnable);
}
NS_IMETHODIMP
FMRadioService::Observe(nsISupports * aSubject,
const char * aTopic,
const char16_t * aData)
{
MOZ_ASSERT(NS_IsMainThread());
MOZ_ASSERT(sFMRadioService);
if (strcmp(aTopic, MOZSETTINGS_CHANGED_ID) != 0) {
return NS_OK;
}
// The string that we're interested in will be a JSON string looks like:
// {"key":"airplaneMode.enabled","value":true}
AutoSafeJSContext cx;
const nsDependentString dataStr(aData);
JS::Rooted<JS::Value> val(cx);
if (!JS_ParseJSON(cx, dataStr.get(), dataStr.Length(), &val) ||
!val.isObject()) {
NS_WARNING("Bad JSON string format.");
return NS_OK;
}
JS::Rooted<JSObject*> obj(cx, &val.toObject());
JS::Rooted<JS::Value> key(cx);
if (!JS_GetProperty(cx, obj, "key", &key) ||
!key.isString()) {
NS_WARNING("Failed to get string property `key`.");
return NS_OK;
}
JS::Rooted<JSString*> jsKey(cx, key.toString());
nsAutoJSString keyStr;
if (!keyStr.init(cx, jsKey)) {
return NS_OK;
}
if (keyStr.EqualsLiteral(SETTING_KEY_AIRPLANEMODE_ENABLED)) {
JS::Rooted<JS::Value> value(cx);
if (!JS_GetProperty(cx, obj, "value", &value)) {
NS_WARNING("Failed to get property `value`.");
return NS_OK;
}
if (!value.isBoolean()) {
return NS_OK;
}
mAirplaneModeEnabled = value.toBoolean();
mHasReadAirplaneModeSetting = true;
// Disable the FM radio HW if Airplane mode is enabled.
if (mAirplaneModeEnabled) {
Disable(nullptr);
}
}
return NS_OK;
}
void
FMRadioService::NotifyFMRadioEvent(FMRadioEventType aType)
{
mObserverList.Broadcast(aType);
}
void
FMRadioService::Notify(const FMRadioOperationInformation& aInfo)
{
switch (aInfo.operation()) {
case FM_RADIO_OPERATION_ENABLE:
MOZ_ASSERT(IsFMRadioOn());
MOZ_ASSERT(mState == Disabling || mState == Enabling);
// If we're disabling, disable the radio right now.
if (mState == Disabling) {
DoDisable();
return;
}
// Fire success callback on the enable request.
TransitionState(SuccessResponse(), Enabled);
// To make sure the FM app will get the right frequency after the FM
// radio is enabled, we have to set the frequency first.
SetFMRadioFrequency(mPendingFrequencyInKHz);
// Bug 949855: enable audio after the FM radio HW is enabled, to make sure
// 'hw.fm.isAnalog' could be detected as |true| during first time launch.
// This case is for audio output on analog path, i.e. 'ro.moz.fm.noAnalog'
// is not |true|.
EnableAudio(true);
// Update the current frequency without sending the`FrequencyChanged`
// event, to make sure the FM app will get the right frequency when the
// `EnabledChange` event is sent.
mPendingFrequencyInKHz = GetFMRadioFrequency();
UpdatePowerState();
// The frequency was changed from '0' to some meaningful number, so we
// should send the `FrequencyChanged` event manually.
NotifyFMRadioEvent(FrequencyChanged);
break;
case FM_RADIO_OPERATION_DISABLE:
MOZ_ASSERT(mState == Disabling);
TransitionState(SuccessResponse(), Disabled);
UpdatePowerState();
break;
case FM_RADIO_OPERATION_SEEK:
// Seek action might be cancelled by SetFrequency(), we need to check if
// the current state is Seeking.
if (mState == Seeking) {
TransitionState(SuccessResponse(), Enabled);
}
UpdateFrequency();
break;
case FM_RADIO_OPERATION_TUNE:
UpdateFrequency();
break;
default:
MOZ_CRASH();
}
}
void
FMRadioService::UpdatePowerState()
{
bool enabled = IsFMRadioOn();
if (enabled != mEnabled) {
mEnabled = enabled;
NotifyFMRadioEvent(EnabledChanged);
}
}
void
FMRadioService::UpdateFrequency()
{
int32_t frequency = GetFMRadioFrequency();
if (mPendingFrequencyInKHz != frequency) {
mPendingFrequencyInKHz = frequency;
NotifyFMRadioEvent(FrequencyChanged);
}
}
// static
FMRadioService*
FMRadioService::Singleton()
{
MOZ_ASSERT(XRE_GetProcessType() == GeckoProcessType_Default);
MOZ_ASSERT(NS_IsMainThread());
if (!sFMRadioService) {
sFMRadioService = new FMRadioService();
ClearOnShutdown(&sFMRadioService);
}
return sFMRadioService;
}
NS_IMPL_ISUPPORTS(FMRadioService, nsIObserver)
END_FMRADIO_NAMESPACE
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