gecko-dev/dom/media/TextTrack.cpp

268 строки
6.9 KiB
C++

/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim:set ts=2 sw=2 et tw=78: */
/* 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/AsyncEventDispatcher.h"
#include "mozilla/dom/TextTrack.h"
#include "mozilla/dom/TextTrackBinding.h"
#include "mozilla/dom/TextTrackList.h"
#include "mozilla/dom/TextTrackCue.h"
#include "mozilla/dom/TextTrackCueList.h"
#include "mozilla/dom/TextTrackRegion.h"
#include "mozilla/dom/HTMLMediaElement.h"
#include "mozilla/dom/HTMLTrackElement.h"
namespace mozilla {
namespace dom {
NS_IMPL_CYCLE_COLLECTION_INHERITED(TextTrack,
DOMEventTargetHelper,
mCueList,
mActiveCueList,
mTextTrackList,
mTrackElement)
NS_IMPL_ADDREF_INHERITED(TextTrack, DOMEventTargetHelper)
NS_IMPL_RELEASE_INHERITED(TextTrack, DOMEventTargetHelper)
NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION_INHERITED(TextTrack)
NS_INTERFACE_MAP_END_INHERITING(DOMEventTargetHelper)
TextTrack::TextTrack(nsPIDOMWindowInner* aOwnerWindow,
TextTrackKind aKind,
const nsAString& aLabel,
const nsAString& aLanguage,
TextTrackMode aMode,
TextTrackReadyState aReadyState,
TextTrackSource aTextTrackSource)
: DOMEventTargetHelper(aOwnerWindow)
, mKind(aKind)
, mLabel(aLabel)
, mLanguage(aLanguage)
, mMode(aMode)
, mReadyState(aReadyState)
, mTextTrackSource(aTextTrackSource)
{
SetDefaultSettings();
}
TextTrack::TextTrack(nsPIDOMWindowInner* aOwnerWindow,
TextTrackList* aTextTrackList,
TextTrackKind aKind,
const nsAString& aLabel,
const nsAString& aLanguage,
TextTrackMode aMode,
TextTrackReadyState aReadyState,
TextTrackSource aTextTrackSource)
: DOMEventTargetHelper(aOwnerWindow)
, mTextTrackList(aTextTrackList)
, mKind(aKind)
, mLabel(aLabel)
, mLanguage(aLanguage)
, mMode(aMode)
, mReadyState(aReadyState)
, mTextTrackSource(aTextTrackSource)
{
SetDefaultSettings();
}
TextTrack::~TextTrack()
{
}
void
TextTrack::SetDefaultSettings()
{
nsPIDOMWindowInner* ownerWindow = GetOwner();
mCueList = new TextTrackCueList(ownerWindow);
mActiveCueList = new TextTrackCueList(ownerWindow);
mCuePos = 0;
mDirty = false;
}
JSObject*
TextTrack::WrapObject(JSContext* aCx, JS::Handle<JSObject*> aGivenProto)
{
return TextTrackBinding::Wrap(aCx, this, aGivenProto);
}
void
TextTrack::SetMode(TextTrackMode aValue)
{
if (mMode != aValue) {
mMode = aValue;
if (mTextTrackList) {
mTextTrackList->CreateAndDispatchChangeEvent();
}
}
}
void
TextTrack::GetId(nsAString& aId) const
{
// If the track has a track element then its id should be the same as the
// track element's id.
if (mTrackElement) {
mTrackElement->GetAttribute(NS_LITERAL_STRING("id"), aId);
}
}
void
TextTrack::AddCue(TextTrackCue& aCue)
{
mCueList->AddCue(aCue);
aCue.SetTrack(this);
if (mTextTrackList) {
HTMLMediaElement* mediaElement = mTextTrackList->GetMediaElement();
if (mediaElement) {
mediaElement->AddCue(aCue);
}
}
SetDirty();
}
void
TextTrack::RemoveCue(TextTrackCue& aCue, ErrorResult& aRv)
{
mCueList->RemoveCue(aCue, aRv);
SetDirty();
}
void
TextTrack::SetCuesDirty()
{
for (uint32_t i = 0; i < mCueList->Length(); i++) {
((*mCueList)[i])->Reset();
}
}
void
TextTrack::UpdateActiveCueList()
{
if (!mTextTrackList) {
return;
}
HTMLMediaElement* mediaElement = mTextTrackList->GetMediaElement();
if (!mediaElement) {
return;
}
// Flag that indicates whether or not this call of UpdateActiveCueList has
// changed the activeCueList.
bool hasChanged = false;
// If we are dirty, i.e. an event happened that may cause the sorted mCueList
// to have changed like a seek or an insert for a cue, than we need to rebuild
// the active cue list from scratch.
if (mDirty) {
mCuePos = 0;
mDirty = false;
mActiveCueList->RemoveAll();
}
double playbackTime = mediaElement->CurrentTime();
// Remove all the cues from the active cue list whose end times now occur
// earlier then the current playback time.
for (uint32_t i = mActiveCueList->Length(); i > 0; i--) {
if ((*mActiveCueList)[i - 1]->EndTime() < playbackTime) {
mActiveCueList->RemoveCueAt(i - 1);
hasChanged = true;
}
}
// Add all the cues, starting from the position of the last cue that was
// added, that have valid start and end times for the current playback time.
// We can stop iterating safely once we encounter a cue that does not have
// a valid start time as the cue list is sorted.
for (; mCuePos < mCueList->Length() &&
(*mCueList)[mCuePos]->StartTime() <= playbackTime; mCuePos++) {
if ((*mCueList)[mCuePos]->EndTime() >= playbackTime) {
mActiveCueList->AddCue(*(*mCueList)[mCuePos]);
hasChanged = true;
}
}
if (hasChanged) {
RefPtr<AsyncEventDispatcher> asyncDispatcher =
new AsyncEventDispatcher(this, NS_LITERAL_STRING("cuechange"), false);
asyncDispatcher->PostDOMEvent();
if (mTrackElement) {
mTrackElement->DispatchTrackRunnable(NS_LITERAL_STRING("cuechange"));
}
}
}
TextTrackCueList*
TextTrack::GetActiveCues() {
if (mMode != TextTrackMode::Disabled) {
UpdateActiveCueList();
return mActiveCueList;
}
return nullptr;
}
void
TextTrack::GetActiveCueArray(nsTArray<RefPtr<TextTrackCue> >& aCues)
{
if (mMode != TextTrackMode::Disabled) {
UpdateActiveCueList();
mActiveCueList->GetArray(aCues);
}
}
TextTrackReadyState
TextTrack::ReadyState() const
{
return mReadyState;
}
void
TextTrack::SetReadyState(uint32_t aReadyState)
{
if (aReadyState <= TextTrackReadyState::FailedToLoad) {
SetReadyState(static_cast<TextTrackReadyState>(aReadyState));
}
}
void
TextTrack::SetReadyState(TextTrackReadyState aState)
{
mReadyState = aState;
if (!mTextTrackList) {
return;
}
HTMLMediaElement* mediaElement = mTextTrackList->GetMediaElement();
if (mediaElement && (mReadyState == TextTrackReadyState::Loaded||
mReadyState == TextTrackReadyState::FailedToLoad)) {
mediaElement->RemoveTextTrack(this, true);
}
}
TextTrackList*
TextTrack::GetTextTrackList()
{
return mTextTrackList;
}
void
TextTrack::SetTextTrackList(TextTrackList* aTextTrackList)
{
mTextTrackList = aTextTrackList;
}
HTMLTrackElement*
TextTrack::GetTrackElement() {
return mTrackElement;
}
void
TextTrack::SetTrackElement(HTMLTrackElement* aTrackElement) {
mTrackElement = aTrackElement;
}
} // namespace dom
} // namespace mozilla