gecko-dev/dom/media/webaudio/AudioBuffer.cpp

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/* -*- 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 "AudioBuffer.h"
#include "mozilla/dom/AudioBufferBinding.h"
#include "jsfriendapi.h"
#include "mozilla/ErrorResult.h"
#include "AudioSegment.h"
#include "AudioChannelFormat.h"
#include "mozilla/PodOperations.h"
#include "mozilla/CheckedInt.h"
#include "mozilla/MemoryReporting.h"
#include "AudioNodeEngine.h"
namespace mozilla {
namespace dom {
NS_IMPL_CYCLE_COLLECTION_CLASS(AudioBuffer)
NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN(AudioBuffer)
NS_IMPL_CYCLE_COLLECTION_UNLINK(mJSChannels)
NS_IMPL_CYCLE_COLLECTION_UNLINK_PRESERVED_WRAPPER
tmp->ClearJSChannels();
NS_IMPL_CYCLE_COLLECTION_UNLINK_END
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN(AudioBuffer)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
NS_IMPL_CYCLE_COLLECTION_TRACE_BEGIN(AudioBuffer)
NS_IMPL_CYCLE_COLLECTION_TRACE_PRESERVED_WRAPPER
for (uint32_t i = 0; i < tmp->mJSChannels.Length(); ++i) {
NS_IMPL_CYCLE_COLLECTION_TRACE_JS_MEMBER_CALLBACK(mJSChannels[i])
}
NS_IMPL_CYCLE_COLLECTION_TRACE_END
NS_IMPL_CYCLE_COLLECTION_ROOT_NATIVE(AudioBuffer, AddRef)
NS_IMPL_CYCLE_COLLECTION_UNROOT_NATIVE(AudioBuffer, Release)
/**
* AudioBuffers can be shared between AudioContexts, so we need a separate
* mechanism to track their memory usage. This thread-safe class keeps track of
* all the AudioBuffers, and gets called back by the memory reporting system
* when a memory report is needed, reporting how much memory is used by the
* buffers backing AudioBuffer objects. */
class AudioBufferMemoryTracker : public nsIMemoryReporter
{
NS_DECL_THREADSAFE_ISUPPORTS
NS_DECL_NSIMEMORYREPORTER
private:
AudioBufferMemoryTracker();
virtual ~AudioBufferMemoryTracker();
public:
/* Those methods can be called on any thread. */
static void RegisterAudioBuffer(const AudioBuffer* aAudioBuffer);
static void UnregisterAudioBuffer(const AudioBuffer* aAudioBuffer);
private:
static AudioBufferMemoryTracker* GetInstance();
/* Those methods must be called with the lock held. */
void RegisterAudioBufferInternal(const AudioBuffer* aAudioBuffer);
/* Returns the number of buffers still present in the hash table. */
uint32_t UnregisterAudioBufferInternal(const AudioBuffer* aAudioBuffer);
void Init();
/* This protects all members of this class. */
static StaticMutex sMutex;
static StaticRefPtr<AudioBufferMemoryTracker> sSingleton;
nsTHashtable<nsPtrHashKey<const AudioBuffer>> mBuffers;
};
StaticRefPtr<AudioBufferMemoryTracker> AudioBufferMemoryTracker::sSingleton;
StaticMutex AudioBufferMemoryTracker::sMutex;
NS_IMPL_ISUPPORTS(AudioBufferMemoryTracker, nsIMemoryReporter);
AudioBufferMemoryTracker* AudioBufferMemoryTracker::GetInstance()
{
sMutex.AssertCurrentThreadOwns();
if (!sSingleton) {
sSingleton = new AudioBufferMemoryTracker();
sSingleton->Init();
}
return sSingleton;
}
AudioBufferMemoryTracker::AudioBufferMemoryTracker()
{
}
void
AudioBufferMemoryTracker::Init()
{
RegisterWeakMemoryReporter(this);
}
AudioBufferMemoryTracker::~AudioBufferMemoryTracker()
{
UnregisterWeakMemoryReporter(this);
}
void
AudioBufferMemoryTracker::RegisterAudioBuffer(const AudioBuffer* aAudioBuffer)
{
StaticMutexAutoLock lock(sMutex);
AudioBufferMemoryTracker* tracker = AudioBufferMemoryTracker::GetInstance();
tracker->RegisterAudioBufferInternal(aAudioBuffer);
}
void
AudioBufferMemoryTracker::UnregisterAudioBuffer(const AudioBuffer* aAudioBuffer)
{
StaticMutexAutoLock lock(sMutex);
AudioBufferMemoryTracker* tracker = AudioBufferMemoryTracker::GetInstance();
uint32_t count;
count = tracker->UnregisterAudioBufferInternal(aAudioBuffer);
if (count == 0) {
sSingleton = nullptr;
}
}
void
AudioBufferMemoryTracker::RegisterAudioBufferInternal(const AudioBuffer* aAudioBuffer)
{
sMutex.AssertCurrentThreadOwns();
mBuffers.PutEntry(aAudioBuffer);
}
uint32_t
AudioBufferMemoryTracker::UnregisterAudioBufferInternal(const AudioBuffer* aAudioBuffer)
{
sMutex.AssertCurrentThreadOwns();
mBuffers.RemoveEntry(aAudioBuffer);
return mBuffers.Count();
}
MOZ_DEFINE_MALLOC_SIZE_OF(AudioBufferMemoryTrackerMallocSizeOf)
NS_IMETHODIMP
AudioBufferMemoryTracker::CollectReports(nsIHandleReportCallback* aHandleReport,
nsISupports* aData, bool)
{
size_t amount = 0;
for (auto iter = mBuffers.Iter(); !iter.Done(); iter.Next()) {
amount += iter.Get()->GetKey()->SizeOfIncludingThis(AudioBufferMemoryTrackerMallocSizeOf);
}
MOZ_COLLECT_REPORT(
"explicit/webaudio/audiobuffer", KIND_HEAP, UNITS_BYTES, amount,
"Memory used by AudioBuffer objects (Web Audio).");
return NS_OK;
}
AudioBuffer::AudioBuffer(nsPIDOMWindowInner* aWindow,
uint32_t aNumberOfChannels,
uint32_t aLength,
float aSampleRate,
already_AddRefed<ThreadSharedFloatArrayBufferList>
aInitialContents)
: mOwnerWindow(do_GetWeakReference(aWindow)),
mSharedChannels(aInitialContents),
mLength(aLength),
mSampleRate(aSampleRate)
{
MOZ_ASSERT(!mSharedChannels ||
mSharedChannels->GetChannels() == aNumberOfChannels);
mJSChannels.SetLength(aNumberOfChannels);
mozilla::HoldJSObjects(this);
AudioBufferMemoryTracker::RegisterAudioBuffer(this);
}
AudioBuffer::~AudioBuffer()
{
AudioBufferMemoryTracker::UnregisterAudioBuffer(this);
ClearJSChannels();
mozilla::DropJSObjects(this);
}
/* static */ already_AddRefed<AudioBuffer>
AudioBuffer::Constructor(const GlobalObject& aGlobal,
const AudioBufferOptions& aOptions,
ErrorResult& aRv)
{
if (!aOptions.mNumberOfChannels) {
aRv.Throw(NS_ERROR_DOM_INDEX_SIZE_ERR);
return nullptr;
}
nsCOMPtr<nsPIDOMWindowInner> window =
do_QueryInterface(aGlobal.GetAsSupports());
return Create(window, aOptions.mNumberOfChannels, aOptions.mLength,
aOptions.mSampleRate, aRv);
}
void
AudioBuffer::ClearJSChannels()
{
mJSChannels.Clear();
}
/* static */ already_AddRefed<AudioBuffer>
AudioBuffer::Create(nsPIDOMWindowInner* aWindow, uint32_t aNumberOfChannels,
uint32_t aLength, float aSampleRate,
already_AddRefed<ThreadSharedFloatArrayBufferList>
aInitialContents,
ErrorResult& aRv)
{
// Note that a buffer with zero channels is permitted here for the sake of
// AudioProcessingEvent, where channel counts must match parameters passed
// to createScriptProcessor(), one of which may be zero.
if (aSampleRate < WebAudioUtils::MinSampleRate ||
aSampleRate > WebAudioUtils::MaxSampleRate ||
aNumberOfChannels > WebAudioUtils::MaxChannelCount ||
!aLength || aLength > INT32_MAX) {
aRv.Throw(NS_ERROR_DOM_INDEX_SIZE_ERR);
return nullptr;
}
Bug 1207245 - part 6 - rename nsRefPtr<T> to RefPtr<T>; r=ehsan; a=Tomcat The bulk of this commit was generated with a script, executed at the top level of a typical source code checkout. The only non-machine-generated part was modifying MFBT's moz.build to reflect the new naming. CLOSED TREE makes big refactorings like this a piece of cake. # The main substitution. find . -name '*.cpp' -o -name '*.cc' -o -name '*.h' -o -name '*.mm' -o -name '*.idl'| \ xargs perl -p -i -e ' s/nsRefPtr\.h/RefPtr\.h/g; # handle includes s/nsRefPtr ?</RefPtr</g; # handle declarations and variables ' # Handle a special friend declaration in gfx/layers/AtomicRefCountedWithFinalize.h. perl -p -i -e 's/::nsRefPtr;/::RefPtr;/' gfx/layers/AtomicRefCountedWithFinalize.h # Handle nsRefPtr.h itself, a couple places that define constructors # from nsRefPtr, and code generators specially. We do this here, rather # than indiscriminantly s/nsRefPtr/RefPtr/, because that would rename # things like nsRefPtrHashtable. perl -p -i -e 's/nsRefPtr/RefPtr/g' \ mfbt/nsRefPtr.h \ xpcom/glue/nsCOMPtr.h \ xpcom/base/OwningNonNull.h \ ipc/ipdl/ipdl/lower.py \ ipc/ipdl/ipdl/builtin.py \ dom/bindings/Codegen.py \ python/lldbutils/lldbutils/utils.py # In our indiscriminate substitution above, we renamed # nsRefPtrGetterAddRefs, the class behind getter_AddRefs. Fix that up. find . -name '*.cpp' -o -name '*.h' -o -name '*.idl' | \ xargs perl -p -i -e 's/nsRefPtrGetterAddRefs/RefPtrGetterAddRefs/g' if [ -d .git ]; then git mv mfbt/nsRefPtr.h mfbt/RefPtr.h else hg mv mfbt/nsRefPtr.h mfbt/RefPtr.h fi --HG-- rename : mfbt/nsRefPtr.h => mfbt/RefPtr.h
2015-10-18 08:24:48 +03:00
RefPtr<AudioBuffer> buffer =
new AudioBuffer(aWindow, aNumberOfChannels, aLength, aSampleRate,
Move(aInitialContents));
return buffer.forget();
}
JSObject*
Bug 1117172 part 3. Change the wrappercached WrapObject methods to allow passing in aGivenProto. r=peterv The only manual changes here are to BindingUtils.h, BindingUtils.cpp, Codegen.py, Element.cpp, IDBFileRequest.cpp, IDBObjectStore.cpp, dom/workers/Navigator.cpp, WorkerPrivate.cpp, DeviceStorageRequestChild.cpp, Notification.cpp, nsGlobalWindow.cpp, MessagePort.cpp, nsJSEnvironment.cpp, Sandbox.cpp, XPCConvert.cpp, ExportHelpers.cpp, and DataStoreService.cpp. The rest of this diff was generated by running the following commands: find . -name "*.h" -o -name "*.cpp" | xargs perl -pi -e 'BEGIN { $/ = undef } s/(WrapObjectInternal\(JSContext *\* *(?:aCx|cx|aContext|aCtx|js))\)/\1, JS::Handle<JSObject*> aGivenProto)/g' find . -name "*.h" -o -name "*.cpp" | xargs perl -pi -e 'BEGIN { $/ = undef } s/(WrapObjectInternal\((?:aCx|cx|aContext|aCtx|js))\)/\1, aGivenProto)/g' find . -name "*.h" -o -name "*.cpp" | xargs perl -pi -e 'BEGIN { $/ = undef } s/(WrapNode\(JSContext *\* *(?:aCx|cx|aContext|aCtx|js))\)/\1, JS::Handle<JSObject*> aGivenProto)/g' find . -name "*.h" -o -name "*.cpp" | xargs perl -pi -e 'BEGIN { $/ = undef } s/(WrapNode\((?:aCx|cx|aContext|aCtx|js))\)/\1, aGivenProto)/g' find . -name "*.h" -o -name "*.cpp" | xargs perl -pi -e 'BEGIN { $/ = undef } s/(WrapObject\(JSContext *\* *(?:aCx|cx|aContext|aCtx|js))\)/\1, JS::Handle<JSObject*> aGivenProto)/g' find . -name "*.h" -o -name "*.cpp" | xargs perl -pi -e 'BEGIN { $/ = undef } s/(Binding(?:_workers)?::Wrap\((?:aCx|cx|aContext|aCtx|js), [^,)]+)\)/\1, aGivenProto)/g'
2015-03-19 17:13:33 +03:00
AudioBuffer::WrapObject(JSContext* aCx, JS::Handle<JSObject*> aGivenProto)
{
Bug 1117172 part 3. Change the wrappercached WrapObject methods to allow passing in aGivenProto. r=peterv The only manual changes here are to BindingUtils.h, BindingUtils.cpp, Codegen.py, Element.cpp, IDBFileRequest.cpp, IDBObjectStore.cpp, dom/workers/Navigator.cpp, WorkerPrivate.cpp, DeviceStorageRequestChild.cpp, Notification.cpp, nsGlobalWindow.cpp, MessagePort.cpp, nsJSEnvironment.cpp, Sandbox.cpp, XPCConvert.cpp, ExportHelpers.cpp, and DataStoreService.cpp. The rest of this diff was generated by running the following commands: find . -name "*.h" -o -name "*.cpp" | xargs perl -pi -e 'BEGIN { $/ = undef } s/(WrapObjectInternal\(JSContext *\* *(?:aCx|cx|aContext|aCtx|js))\)/\1, JS::Handle<JSObject*> aGivenProto)/g' find . -name "*.h" -o -name "*.cpp" | xargs perl -pi -e 'BEGIN { $/ = undef } s/(WrapObjectInternal\((?:aCx|cx|aContext|aCtx|js))\)/\1, aGivenProto)/g' find . -name "*.h" -o -name "*.cpp" | xargs perl -pi -e 'BEGIN { $/ = undef } s/(WrapNode\(JSContext *\* *(?:aCx|cx|aContext|aCtx|js))\)/\1, JS::Handle<JSObject*> aGivenProto)/g' find . -name "*.h" -o -name "*.cpp" | xargs perl -pi -e 'BEGIN { $/ = undef } s/(WrapNode\((?:aCx|cx|aContext|aCtx|js))\)/\1, aGivenProto)/g' find . -name "*.h" -o -name "*.cpp" | xargs perl -pi -e 'BEGIN { $/ = undef } s/(WrapObject\(JSContext *\* *(?:aCx|cx|aContext|aCtx|js))\)/\1, JS::Handle<JSObject*> aGivenProto)/g' find . -name "*.h" -o -name "*.cpp" | xargs perl -pi -e 'BEGIN { $/ = undef } s/(Binding(?:_workers)?::Wrap\((?:aCx|cx|aContext|aCtx|js), [^,)]+)\)/\1, aGivenProto)/g'
2015-03-19 17:13:33 +03:00
return AudioBufferBinding::Wrap(aCx, this, aGivenProto);
}
bool
AudioBuffer::RestoreJSChannelData(JSContext* aJSContext)
{
for (uint32_t i = 0; i < mJSChannels.Length(); ++i) {
if (mJSChannels[i]) {
// Already have data in JS array.
continue;
}
// The following code first zeroes the array and then copies our data
// into it. We could avoid this with additional JS APIs to construct
// an array (or ArrayBuffer) containing initial data.
JS::Rooted<JSObject*> array(aJSContext,
JS_NewFloat32Array(aJSContext, mLength));
if (!array) {
return false;
}
if (mSharedChannels) {
// "4. Attach ArrayBuffers containing copies of the data to the
// AudioBuffer, to be returned by the next call to getChannelData."
const float* data = mSharedChannels->GetData(i);
JS::AutoCheckCannotGC nogc;
bool isShared;
mozilla::PodCopy(JS_GetFloat32ArrayData(array, &isShared, nogc), data, mLength);
MOZ_ASSERT(!isShared); // Was created as unshared above
}
mJSChannels[i] = array;
}
mSharedChannels = nullptr;
return true;
}
void
AudioBuffer::CopyFromChannel(const Float32Array& aDestination, uint32_t aChannelNumber,
uint32_t aStartInChannel, ErrorResult& aRv)
{
aDestination.ComputeLengthAndData();
uint32_t length = aDestination.Length();
CheckedInt<uint32_t> end = aStartInChannel;
end += length;
if (aChannelNumber >= NumberOfChannels() ||
!end.isValid() || end.value() > mLength) {
aRv.Throw(NS_ERROR_DOM_INDEX_SIZE_ERR);
return;
}
JS::AutoCheckCannotGC nogc;
JSObject* channelArray = mJSChannels[aChannelNumber];
const float* sourceData = nullptr;
if (channelArray) {
if (JS_GetTypedArrayLength(channelArray) != mLength) {
// The array's buffer was detached.
aRv.Throw(NS_ERROR_DOM_INDEX_SIZE_ERR);
return;
}
bool isShared = false;
sourceData = JS_GetFloat32ArrayData(channelArray, &isShared, nogc);
// The sourceData arrays should all have originated in
// RestoreJSChannelData, where they are created unshared.
MOZ_ASSERT(!isShared);
} else if (mSharedChannels) {
sourceData = mSharedChannels->GetData(aChannelNumber);
}
if (sourceData) {
PodMove(aDestination.Data(), sourceData + aStartInChannel, length);
} else {
PodZero(aDestination.Data(), length);
}
}
void
AudioBuffer::CopyToChannel(JSContext* aJSContext, const Float32Array& aSource,
uint32_t aChannelNumber, uint32_t aStartInChannel,
ErrorResult& aRv)
{
aSource.ComputeLengthAndData();
uint32_t length = aSource.Length();
CheckedInt<uint32_t> end = aStartInChannel;
end += length;
if (aChannelNumber >= NumberOfChannels() ||
!end.isValid() || end.value() > mLength) {
aRv.Throw(NS_ERROR_DOM_INDEX_SIZE_ERR);
return;
}
if (!RestoreJSChannelData(aJSContext)) {
aRv.Throw(NS_ERROR_OUT_OF_MEMORY);
return;
}
JS::AutoCheckCannotGC nogc;
JSObject* channelArray = mJSChannels[aChannelNumber];
if (JS_GetTypedArrayLength(channelArray) != mLength) {
// The array's buffer was detached.
aRv.Throw(NS_ERROR_DOM_INDEX_SIZE_ERR);
return;
}
bool isShared = false;
float* channelData = JS_GetFloat32ArrayData(channelArray, &isShared, nogc);
// The channelData arrays should all have originated in
// RestoreJSChannelData, where they are created unshared.
MOZ_ASSERT(!isShared);
PodMove(channelData + aStartInChannel, aSource.Data(), length);
}
void
AudioBuffer::GetChannelData(JSContext* aJSContext, uint32_t aChannel,
JS::MutableHandle<JSObject*> aRetval,
ErrorResult& aRv)
{
if (aChannel >= NumberOfChannels()) {
aRv.Throw(NS_ERROR_DOM_SYNTAX_ERR);
return;
}
if (!RestoreJSChannelData(aJSContext)) {
aRv.Throw(NS_ERROR_OUT_OF_MEMORY);
return;
}
aRetval.set(mJSChannels[aChannel]);
}
already_AddRefed<ThreadSharedFloatArrayBufferList>
AudioBuffer::StealJSArrayDataIntoSharedChannels(JSContext* aJSContext)
{
// "1. If any of the AudioBuffer's ArrayBuffer have been detached, abort
// these steps, and return a zero-length channel data buffers to the
// invoker."
for (uint32_t i = 0; i < mJSChannels.Length(); ++i) {
JSObject* channelArray = mJSChannels[i];
if (!channelArray || mLength != JS_GetTypedArrayLength(channelArray)) {
// Either empty buffer or one of the arrays' buffers was detached.
return nullptr;
}
}
// "2. Detach all ArrayBuffers for arrays previously returned by
// getChannelData on this AudioBuffer."
// "3. Retain the underlying data buffers from those ArrayBuffers and return
// references to them to the invoker."
Bug 1207245 - part 6 - rename nsRefPtr<T> to RefPtr<T>; r=ehsan; a=Tomcat The bulk of this commit was generated with a script, executed at the top level of a typical source code checkout. The only non-machine-generated part was modifying MFBT's moz.build to reflect the new naming. CLOSED TREE makes big refactorings like this a piece of cake. # The main substitution. find . -name '*.cpp' -o -name '*.cc' -o -name '*.h' -o -name '*.mm' -o -name '*.idl'| \ xargs perl -p -i -e ' s/nsRefPtr\.h/RefPtr\.h/g; # handle includes s/nsRefPtr ?</RefPtr</g; # handle declarations and variables ' # Handle a special friend declaration in gfx/layers/AtomicRefCountedWithFinalize.h. perl -p -i -e 's/::nsRefPtr;/::RefPtr;/' gfx/layers/AtomicRefCountedWithFinalize.h # Handle nsRefPtr.h itself, a couple places that define constructors # from nsRefPtr, and code generators specially. We do this here, rather # than indiscriminantly s/nsRefPtr/RefPtr/, because that would rename # things like nsRefPtrHashtable. perl -p -i -e 's/nsRefPtr/RefPtr/g' \ mfbt/nsRefPtr.h \ xpcom/glue/nsCOMPtr.h \ xpcom/base/OwningNonNull.h \ ipc/ipdl/ipdl/lower.py \ ipc/ipdl/ipdl/builtin.py \ dom/bindings/Codegen.py \ python/lldbutils/lldbutils/utils.py # In our indiscriminate substitution above, we renamed # nsRefPtrGetterAddRefs, the class behind getter_AddRefs. Fix that up. find . -name '*.cpp' -o -name '*.h' -o -name '*.idl' | \ xargs perl -p -i -e 's/nsRefPtrGetterAddRefs/RefPtrGetterAddRefs/g' if [ -d .git ]; then git mv mfbt/nsRefPtr.h mfbt/RefPtr.h else hg mv mfbt/nsRefPtr.h mfbt/RefPtr.h fi --HG-- rename : mfbt/nsRefPtr.h => mfbt/RefPtr.h
2015-10-18 08:24:48 +03:00
RefPtr<ThreadSharedFloatArrayBufferList> result =
new ThreadSharedFloatArrayBufferList(mJSChannels.Length());
for (uint32_t i = 0; i < mJSChannels.Length(); ++i) {
JS::Rooted<JSObject*> arrayBufferView(aJSContext, mJSChannels[i]);
bool isSharedMemory;
JS::Rooted<JSObject*> arrayBuffer(aJSContext,
JS_GetArrayBufferViewBuffer(aJSContext,
arrayBufferView,
&isSharedMemory));
// The channel data arrays should all have originated in
// RestoreJSChannelData, where they are created unshared.
MOZ_ASSERT(!isSharedMemory);
auto stolenData =
arrayBuffer ? static_cast<float*>(
JS_StealArrayBufferContents(aJSContext, arrayBuffer))
: nullptr;
if (stolenData) {
result->SetData(i, stolenData, js_free, stolenData);
} else {
NS_ASSERTION(i == 0, "some channels lost when contents not acquired");
return nullptr;
}
}
for (uint32_t i = 0; i < mJSChannels.Length(); ++i) {
mJSChannels[i] = nullptr;
}
return result.forget();
}
ThreadSharedFloatArrayBufferList*
AudioBuffer::GetThreadSharedChannelsForRate(JSContext* aJSContext)
{
if (!mSharedChannels) {
mSharedChannels = StealJSArrayDataIntoSharedChannels(aJSContext);
}
return mSharedChannels;
}
size_t
AudioBuffer::SizeOfIncludingThis(MallocSizeOf aMallocSizeOf) const
{
size_t amount = aMallocSizeOf(this);
amount += mJSChannels.ShallowSizeOfExcludingThis(aMallocSizeOf);
if (mSharedChannels) {
amount += mSharedChannels->SizeOfIncludingThis(aMallocSizeOf);
}
return amount;
}
} // namespace dom
} // namespace mozilla