gecko-dev/dom/html/TextTrackManager.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/TextTrackManager.h"
#include "mozilla/dom/HTMLMediaElement.h"
#include "mozilla/dom/HTMLTrackElement.h"
#include "mozilla/dom/HTMLVideoElement.h"
#include "mozilla/dom/TextTrack.h"
#include "mozilla/dom/TextTrackCue.h"
#include "mozilla/dom/Event.h"
#include "mozilla/ClearOnShutdown.h"
#include "nsComponentManagerUtils.h"
#include "nsVariant.h"
#include "nsVideoFrame.h"
#include "nsIFrame.h"
#include "nsTArrayHelpers.h"
#include "nsIWebVTTParserWrapper.h"
namespace mozilla {
namespace dom {
CompareTextTracks::CompareTextTracks(HTMLMediaElement* aMediaElement)
{
mMediaElement = aMediaElement;
}
int32_t
CompareTextTracks::TrackChildPosition(TextTrack* aTextTrack) const {
HTMLTrackElement* trackElement = aTextTrack->GetTrackElement();
if (!trackElement) {
return -1;
}
return mMediaElement->IndexOf(trackElement);
}
bool
CompareTextTracks::Equals(TextTrack* aOne, TextTrack* aTwo) const {
// Two tracks can never be equal. If they have corresponding TrackElements
// they would need to occupy the same tree position (impossible) and in the
// case of tracks coming from AddTextTrack source we put the newest at the
// last position, so they won't be equal as well.
return false;
}
bool
CompareTextTracks::LessThan(TextTrack* aOne, TextTrack* aTwo) const
{
TextTrackSource sourceOne = aOne->GetTextTrackSource();
TextTrackSource sourceTwo = aTwo->GetTextTrackSource();
if (sourceOne != sourceTwo) {
return sourceOne == Track ||
(sourceOne == AddTextTrack && sourceTwo == MediaResourceSpecific);
}
switch (sourceOne) {
case Track: {
int32_t positionOne = TrackChildPosition(aOne);
int32_t positionTwo = TrackChildPosition(aTwo);
// If either position one or positiontwo are -1 then something has gone
// wrong. In this case we should just put them at the back of the list.
return positionOne != -1 && positionTwo != -1 &&
positionOne < positionTwo;
}
case AddTextTrack:
// For AddTextTrack sources the tracks will already be in the correct relative
// order in the source array. Assume we're called in iteration order and can
// therefore always report aOne < aTwo to maintain the original temporal ordering.
return true;
case MediaResourceSpecific:
// No rules for Media Resource Specific tracks yet.
break;
}
return true;
}
NS_IMPL_CYCLE_COLLECTION(TextTrackManager, mMediaElement, mTextTracks,
mPendingTextTracks, mNewCues)
NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(TextTrackManager)
NS_INTERFACE_MAP_ENTRY(nsIDOMEventListener)
NS_INTERFACE_MAP_END
NS_IMPL_CYCLE_COLLECTING_ADDREF(TextTrackManager)
NS_IMPL_CYCLE_COLLECTING_RELEASE(TextTrackManager)
StaticRefPtr<nsIWebVTTParserWrapper> TextTrackManager::sParserWrapper;
TextTrackManager::TextTrackManager(HTMLMediaElement *aMediaElement)
: mMediaElement(aMediaElement)
, performedTrackSelection(false)
{
nsISupports* parentObject =
mMediaElement->OwnerDoc()->GetParentObject();
NS_ENSURE_TRUE_VOID(parentObject);
nsCOMPtr<nsPIDOMWindow> window = do_QueryInterface(parentObject);
mNewCues = new TextTrackCueList(window);
mTextTracks = new TextTrackList(window, this);
mPendingTextTracks = new TextTrackList(window, this);
if (!sParserWrapper) {
nsCOMPtr<nsIWebVTTParserWrapper> parserWrapper =
do_CreateInstance(NS_WEBVTTPARSERWRAPPER_CONTRACTID);
sParserWrapper = parserWrapper;
ClearOnShutdown(&sParserWrapper);
}
}
TextTrackManager::~TextTrackManager()
{
}
TextTrackList*
TextTrackManager::GetTextTracks() const
{
return mTextTracks;
}
already_AddRefed<TextTrack>
TextTrackManager::AddTextTrack(TextTrackKind aKind, const nsAString& aLabel,
const nsAString& aLanguage,
TextTrackMode aMode,
TextTrackReadyState aReadyState,
TextTrackSource aTextTrackSource)
{
if (!mMediaElement || !mTextTracks) {
return nullptr;
}
RefPtr<TextTrack> ttrack =
mTextTracks->AddTextTrack(aKind, aLabel, aLanguage, aMode, aReadyState,
aTextTrackSource, CompareTextTracks(mMediaElement));
AddCues(ttrack);
if (aTextTrackSource == Track) {
HonorUserPreferencesForTrackSelection();
}
return ttrack.forget();
}
void
TextTrackManager::AddTextTrack(TextTrack* aTextTrack)
{
if (!mMediaElement || !mTextTracks) {
return;
}
mTextTracks->AddTextTrack(aTextTrack, CompareTextTracks(mMediaElement));
AddCues(aTextTrack);
if (aTextTrack->GetTextTrackSource() == Track) {
HonorUserPreferencesForTrackSelection();
}
}
void
TextTrackManager::AddCues(TextTrack* aTextTrack)
{
if (!mNewCues) {
return;
}
TextTrackCueList* cueList = aTextTrack->GetCues();
if (cueList) {
bool dummy;
for (uint32_t i = 0; i < cueList->Length(); ++i) {
mNewCues->AddCue(*cueList->IndexedGetter(i, dummy));
}
}
}
void
TextTrackManager::RemoveTextTrack(TextTrack* aTextTrack, bool aPendingListOnly)
{
if (!mPendingTextTracks || !mTextTracks) {
return;
}
mPendingTextTracks->RemoveTextTrack(aTextTrack);
if (aPendingListOnly) {
return;
}
mTextTracks->RemoveTextTrack(aTextTrack);
}
void
TextTrackManager::DidSeek()
{
if (mTextTracks) {
mTextTracks->DidSeek();
}
}
void
TextTrackManager::UpdateCueDisplay()
{
if (!mMediaElement || !mTextTracks) {
return;
}
nsIFrame* frame = mMediaElement->GetPrimaryFrame();
nsVideoFrame* videoFrame = do_QueryFrame(frame);
if (!videoFrame) {
return;
}
nsCOMPtr<nsIContent> overlay = videoFrame->GetCaptionOverlay();
if (!overlay) {
return;
}
nsTArray<RefPtr<TextTrackCue> > activeCues;
mTextTracks->UpdateAndGetShowingCues(activeCues);
if (activeCues.Length() > 0) {
RefPtr<nsVariantCC> jsCues = new nsVariantCC();
jsCues->SetAsArray(nsIDataType::VTYPE_INTERFACE,
&NS_GET_IID(nsIDOMEventTarget),
activeCues.Length(),
static_cast<void*>(activeCues.Elements()));
nsPIDOMWindow* window = mMediaElement->OwnerDoc()->GetWindow();
if (window) {
sParserWrapper->ProcessCues(window, jsCues, overlay);
}
} else if (overlay->Length() > 0) {
nsContentUtils::SetNodeTextContent(overlay, EmptyString(), true);
}
}
void
TextTrackManager::AddCue(TextTrackCue& aCue)
{
if (mNewCues) {
mNewCues->AddCue(aCue);
}
}
void
TextTrackManager::PopulatePendingList()
{
if (!mTextTracks || !mPendingTextTracks || !mMediaElement) {
return;
}
uint32_t len = mTextTracks->Length();
bool dummy;
for (uint32_t index = 0; index < len; ++index) {
TextTrack* ttrack = mTextTracks->IndexedGetter(index, dummy);
if (ttrack && ttrack->Mode() != TextTrackMode::Disabled &&
ttrack->ReadyState() == TextTrackReadyState::Loading) {
mPendingTextTracks->AddTextTrack(ttrack,
CompareTextTracks(mMediaElement));
}
}
}
void
TextTrackManager::AddListeners()
{
if (mMediaElement) {
mMediaElement->AddEventListener(NS_LITERAL_STRING("resizevideocontrols"),
this, false, false);
}
}
void
TextTrackManager::HonorUserPreferencesForTrackSelection()
{
if (performedTrackSelection || !mTextTracks) {
return;
}
TextTrackKind ttKinds[] = { TextTrackKind::Captions,
TextTrackKind::Subtitles };
// Steps 1 - 3: Perform automatic track selection for different TextTrack
// Kinds.
PerformTrackSelection(ttKinds, ArrayLength(ttKinds));
PerformTrackSelection(TextTrackKind::Descriptions);
PerformTrackSelection(TextTrackKind::Chapters);
// Step 4: Set all TextTracks with a kind of metadata that are disabled
// to hidden.
for (uint32_t i = 0; i < mTextTracks->Length(); i++) {
TextTrack* track = (*mTextTracks)[i];
if (track->Kind() == TextTrackKind::Metadata && TrackIsDefault(track) &&
track->Mode() == TextTrackMode::Disabled) {
track->SetMode(TextTrackMode::Hidden);
}
}
performedTrackSelection = true;
}
bool
TextTrackManager::TrackIsDefault(TextTrack* aTextTrack)
{
HTMLTrackElement* trackElement = aTextTrack->GetTrackElement();
if (!trackElement) {
return false;
}
return trackElement->Default();
}
void
TextTrackManager::PerformTrackSelection(TextTrackKind aTextTrackKind)
{
TextTrackKind ttKinds[] = { aTextTrackKind };
PerformTrackSelection(ttKinds, ArrayLength(ttKinds));
}
void
TextTrackManager::PerformTrackSelection(TextTrackKind aTextTrackKinds[],
uint32_t size)
{
nsTArray<TextTrack*> candidates;
GetTextTracksOfKinds(aTextTrackKinds, size, candidates);
// Step 3: If any TextTracks in candidates are showing then abort these steps.
for (uint32_t i = 0; i < candidates.Length(); i++) {
if (candidates[i]->Mode() == TextTrackMode::Showing) {
return;
}
}
// Step 4: Honor user preferences for track selection, otherwise, set the
// first TextTrack in candidates with a default attribute to showing.
// TODO: Bug 981691 - Honor user preferences for text track selection.
for (uint32_t i = 0; i < candidates.Length(); i++) {
if (TrackIsDefault(candidates[i]) &&
candidates[i]->Mode() == TextTrackMode::Disabled) {
candidates[i]->SetMode(TextTrackMode::Showing);
return;
}
}
}
void
TextTrackManager::GetTextTracksOfKinds(TextTrackKind aTextTrackKinds[],
uint32_t size,
nsTArray<TextTrack*>& aTextTracks)
{
for (uint32_t i = 0; i < size; i++) {
GetTextTracksOfKind(aTextTrackKinds[i], aTextTracks);
}
}
void
TextTrackManager::GetTextTracksOfKind(TextTrackKind aTextTrackKind,
nsTArray<TextTrack*>& aTextTracks)
{
if (!mTextTracks) {
return;
}
for (uint32_t i = 0; i < mTextTracks->Length(); i++) {
TextTrack* textTrack = (*mTextTracks)[i];
if (textTrack->Kind() == aTextTrackKind) {
aTextTracks.AppendElement(textTrack);
}
}
}
NS_IMETHODIMP
TextTrackManager::HandleEvent(nsIDOMEvent* aEvent)
{
if (!mTextTracks) {
return NS_OK;
}
nsAutoString type;
aEvent->GetType(type);
if (type.EqualsLiteral("resizevideocontrols")) {
for (uint32_t i = 0; i< mTextTracks->Length(); i++) {
((*mTextTracks)[i])->SetCuesDirty();
}
}
return NS_OK;
}
} // namespace dom
} // namespace mozilla