gecko-dev/dom/html/HTMLTrackElement.cpp

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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=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 "mozilla/dom/Element.h"
#include "mozilla/dom/HTMLMediaElement.h"
#include "mozilla/dom/HTMLTrackElement.h"
#include "mozilla/dom/HTMLTrackElementBinding.h"
#include "mozilla/dom/HTMLUnknownElement.h"
#include "nsIContentPolicy.h"
#include "mozilla/LoadInfo.h"
#include "WebVTTListener.h"
#include "nsAttrValueInlines.h"
#include "nsCOMPtr.h"
#include "nsContentPolicyUtils.h"
#include "nsContentUtils.h"
#include "nsCycleCollectionParticipant.h"
#include "nsGenericHTMLElement.h"
#include "nsGkAtoms.h"
#include "nsIAsyncVerifyRedirectCallback.h"
#include "nsICachingChannel.h"
#include "nsIChannelEventSink.h"
#include "nsIContentPolicy.h"
#include "nsIContentSecurityPolicy.h"
#include "nsIDocument.h"
#include "nsIDOMEventTarget.h"
#include "nsIDOMHTMLMediaElement.h"
#include "nsIHttpChannel.h"
#include "nsIInterfaceRequestor.h"
#include "nsILoadGroup.h"
#include "nsIObserver.h"
#include "nsIStreamListener.h"
#include "nsISupportsImpl.h"
#include "nsMappedAttributes.h"
#include "nsNetUtil.h"
#include "nsRuleData.h"
#include "nsStyleConsts.h"
#include "nsThreadUtils.h"
#include "nsVideoFrame.h"
static mozilla::LazyLogModule gTrackElementLog("nsTrackElement");
#define LOG(type, msg) MOZ_LOG(gTrackElementLog, type, msg)
// Replace the usual NS_IMPL_NS_NEW_HTML_ELEMENT(Track) so
// we can return an UnknownElement instead when pref'd off.
nsGenericHTMLElement*
NS_NewHTMLTrackElement(already_AddRefed<mozilla::dom::NodeInfo>&& aNodeInfo,
mozilla::dom::FromParser aFromParser)
{
if (!mozilla::dom::HTMLTrackElement::IsWebVTTEnabled()) {
return new mozilla::dom::HTMLUnknownElement(aNodeInfo);
}
return new mozilla::dom::HTMLTrackElement(aNodeInfo);
}
namespace mozilla {
namespace dom {
// Map html attribute string values to TextTrackKind enums.
static MOZ_CONSTEXPR nsAttrValue::EnumTable kKindTable[] = {
{ "subtitles", static_cast<int16_t>(TextTrackKind::Subtitles) },
{ "captions", static_cast<int16_t>(TextTrackKind::Captions) },
{ "descriptions", static_cast<int16_t>(TextTrackKind::Descriptions) },
{ "chapters", static_cast<int16_t>(TextTrackKind::Chapters) },
{ "metadata", static_cast<int16_t>(TextTrackKind::Metadata) },
{ 0 }
};
// The default value for kKindTable is "subtitles"
static MOZ_CONSTEXPR const char* kKindTableDefaultString = kKindTable[0].tag;
/** HTMLTrackElement */
HTMLTrackElement::HTMLTrackElement(already_AddRefed<mozilla::dom::NodeInfo>& aNodeInfo)
: nsGenericHTMLElement(aNodeInfo)
{
}
HTMLTrackElement::~HTMLTrackElement()
{
}
NS_IMPL_ELEMENT_CLONE(HTMLTrackElement)
NS_IMPL_ADDREF_INHERITED(HTMLTrackElement, Element)
NS_IMPL_RELEASE_INHERITED(HTMLTrackElement, Element)
NS_IMPL_CYCLE_COLLECTION_INHERITED(HTMLTrackElement, nsGenericHTMLElement,
mTrack, mMediaParent, mListener)
NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION_INHERITED(HTMLTrackElement)
NS_INTERFACE_MAP_END_INHERITING(nsGenericHTMLElement)
void
HTMLTrackElement::GetKind(DOMString& aKind) const
{
GetEnumAttr(nsGkAtoms::kind, kKindTableDefaultString, aKind);
}
void
HTMLTrackElement::OnChannelRedirect(nsIChannel* aChannel,
nsIChannel* aNewChannel,
uint32_t aFlags)
{
NS_ASSERTION(aChannel == mChannel, "Channels should match!");
mChannel = aNewChannel;
}
JSObject*
HTMLTrackElement::WrapNode(JSContext* aCx, JS::Handle<JSObject*> aGivenProto)
{
return HTMLTrackElementBinding::Wrap(aCx, this, aGivenProto);
}
bool
HTMLTrackElement::IsWebVTTEnabled()
{
// Our callee does not use its arguments.
return HTMLTrackElementBinding::ConstructorEnabled(nullptr, nullptr);
}
TextTrack*
HTMLTrackElement::GetTrack()
{
if (!mTrack) {
CreateTextTrack();
}
return mTrack;
}
void
HTMLTrackElement::CreateTextTrack()
{
nsString label, srcLang;
GetSrclang(srcLang);
GetLabel(label);
TextTrackKind kind;
if (const nsAttrValue* value = GetParsedAttr(nsGkAtoms::kind)) {
kind = static_cast<TextTrackKind>(value->GetEnumValue());
} else {
kind = TextTrackKind::Subtitles;
}
nsISupports* parentObject =
OwnerDoc()->GetParentObject();
NS_ENSURE_TRUE_VOID(parentObject);
nsCOMPtr<nsPIDOMWindowInner> window = do_QueryInterface(parentObject);
mTrack = new TextTrack(window, kind, label, srcLang,
TextTrackMode::Disabled,
TextTrackReadyState::NotLoaded,
TextTrackSource::Track);
mTrack->SetTrackElement(this);
if (mMediaParent) {
mMediaParent->AddTextTrack(mTrack);
}
}
bool
HTMLTrackElement::ParseAttribute(int32_t aNamespaceID,
nsIAtom* aAttribute,
const nsAString& aValue,
nsAttrValue& aResult)
{
if (aNamespaceID == kNameSpaceID_None && aAttribute == nsGkAtoms::kind) {
// Case-insensitive lookup, with the first element as the default.
return aResult.ParseEnumValue(aValue, kKindTable, false, kKindTable);
}
// Otherwise call the generic implementation.
return nsGenericHTMLElement::ParseAttribute(aNamespaceID,
aAttribute,
aValue,
aResult);
}
void
HTMLTrackElement::LoadResource()
{
// Find our 'src' url
nsAutoString src;
if (!GetAttr(kNameSpaceID_None, nsGkAtoms::src, src)) {
return;
}
nsCOMPtr<nsIURI> uri;
nsresult rv = NewURIFromString(src, getter_AddRefs(uri));
NS_ENSURE_TRUE_VOID(NS_SUCCEEDED(rv));
LOG(LogLevel::Info, ("%p Trying to load from src=%s", this,
NS_ConvertUTF16toUTF8(src).get()));
if (mChannel) {
mChannel->Cancel(NS_BINDING_ABORTED);
mChannel = nullptr;
}
// We may already have a TextTrack at this point if GetTrack() has already
// been called. This happens, for instance, if script tries to get the
// TextTrack before its mTrackElement has been bound to the DOM tree.
if (!mTrack) {
CreateTextTrack();
}
nsCOMPtr<nsIChannel> channel;
nsCOMPtr<nsILoadGroup> loadGroup = OwnerDoc()->GetDocumentLoadGroup();
rv = NS_NewChannel(getter_AddRefs(channel),
uri,
static_cast<Element*>(this),
nsILoadInfo::SEC_ALLOW_CROSS_ORIGIN_DATA_INHERITS,
nsIContentPolicy::TYPE_INTERNAL_TRACK,
loadGroup);
NS_ENSURE_TRUE_VOID(NS_SUCCEEDED(rv));
mListener = new WebVTTListener(this);
rv = mListener->LoadResource();
NS_ENSURE_TRUE_VOID(NS_SUCCEEDED(rv));
channel->SetNotificationCallbacks(mListener);
LOG(LogLevel::Debug, ("opening webvtt channel"));
rv = channel->AsyncOpen2(mListener);
NS_ENSURE_TRUE_VOID(NS_SUCCEEDED(rv));
mChannel = channel;
}
nsresult
HTMLTrackElement::BindToTree(nsIDocument* aDocument,
nsIContent* aParent,
nsIContent* aBindingParent,
bool aCompileEventHandlers)
{
nsresult rv = nsGenericHTMLElement::BindToTree(aDocument,
aParent,
aBindingParent,
aCompileEventHandlers);
NS_ENSURE_SUCCESS(rv, rv);
if (!aDocument) {
return NS_OK;
}
LOG(LogLevel::Debug, ("Track Element bound to tree."));
if (!aParent || !aParent->IsNodeOfType(nsINode::eMEDIA)) {
return NS_OK;
}
// Store our parent so we can look up its frame for display.
if (!mMediaParent) {
mMediaParent = static_cast<HTMLMediaElement*>(aParent);
HTMLMediaElement* media = static_cast<HTMLMediaElement*>(aParent);
// TODO: separate notification for 'alternate' tracks?
media->NotifyAddedSource();
LOG(LogLevel::Debug, ("Track element sent notification to parent."));
mMediaParent->RunInStableState(
NS_NewRunnableMethod(this, &HTMLTrackElement::LoadResource));
}
return NS_OK;
}
void
HTMLTrackElement::UnbindFromTree(bool aDeep, bool aNullParent)
{
if (mMediaParent) {
// mTrack can be null if HTMLTrackElement::LoadResource has never been
// called.
if (mTrack) {
mMediaParent->RemoveTextTrack(mTrack);
}
if (aNullParent) {
mMediaParent = nullptr;
}
}
nsGenericHTMLElement::UnbindFromTree(aDeep, aNullParent);
}
uint16_t
HTMLTrackElement::ReadyState() const
{
if (!mTrack) {
return TextTrackReadyState::NotLoaded;
}
return mTrack->ReadyState();
}
void
HTMLTrackElement::SetReadyState(uint16_t aReadyState)
{
if (mTrack) {
switch (aReadyState) {
case TextTrackReadyState::Loaded:
DispatchTrackRunnable(NS_LITERAL_STRING("load"));
break;
case TextTrackReadyState::FailedToLoad:
DispatchTrackRunnable(NS_LITERAL_STRING("error"));
break;
}
mTrack->SetReadyState(aReadyState);
}
}
void
HTMLTrackElement::DispatchTrackRunnable(const nsString& aEventName)
{
nsCOMPtr<nsIRunnable> runnable =
NS_NewRunnableMethodWithArg
<const nsString>(this,
&HTMLTrackElement::DispatchTrustedEvent,
aEventName);
NS_DispatchToMainThread(runnable);
}
void
HTMLTrackElement::DispatchTrustedEvent(const nsAString& aName)
{
nsIDocument* doc = OwnerDoc();
if (!doc) {
return;
}
nsContentUtils::DispatchTrustedEvent(doc, static_cast<nsIContent*>(this),
aName, false, false);
}
void
HTMLTrackElement::DropChannel()
{
mChannel = nullptr;
}
} // namespace dom
} // namespace mozilla