gecko/content/media/TextTrack.cpp

200 lines
5.1 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/dom/TextTrack.h"
#include "mozilla/dom/TextTrackBinding.h"
#include "mozilla/dom/TextTrackCue.h"
#include "mozilla/dom/TextTrackCueList.h"
#include "mozilla/dom/TextTrackRegion.h"
#include "mozilla/dom/TextTrackRegionList.h"
#include "mozilla/dom/HTMLMediaElement.h"
#include "mozilla/dom/HTMLTrackElement.h"
namespace mozilla {
namespace dom {
NS_IMPL_CYCLE_COLLECTION_INHERITED_5(TextTrack,
nsDOMEventTargetHelper,
mParent,
mMediaElement,
mCueList,
mActiveCueList,
mRegionList)
NS_IMPL_ADDREF_INHERITED(TextTrack, nsDOMEventTargetHelper)
NS_IMPL_RELEASE_INHERITED(TextTrack, nsDOMEventTargetHelper)
NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION_INHERITED(TextTrack)
NS_INTERFACE_MAP_END_INHERITING(nsDOMEventTargetHelper)
TextTrack::TextTrack(nsISupports* aParent)
: mParent(aParent)
{
SetDefaultSettings();
SetIsDOMBinding();
}
TextTrack::TextTrack(nsISupports* aParent, HTMLMediaElement* aMediaElement)
: mParent(aParent)
, mMediaElement(aMediaElement)
{
SetDefaultSettings();
SetIsDOMBinding();
}
TextTrack::TextTrack(nsISupports* aParent,
HTMLMediaElement* aMediaElement,
TextTrackKind aKind,
const nsAString& aLabel,
const nsAString& aLanguage)
: mParent(aParent)
, mMediaElement(aMediaElement)
{
SetDefaultSettings();
mKind = aKind;
mLabel = aLabel;
mLanguage = aLanguage;
SetIsDOMBinding();
}
void
TextTrack::SetDefaultSettings()
{
mKind = TextTrackKind::Subtitles;
mMode = TextTrackMode::Hidden;
mCueList = new TextTrackCueList(mParent);
mActiveCueList = new TextTrackCueList(mParent);
mRegionList = new TextTrackRegionList(mParent);
mCuePos = 0;
mDirty = false;
mReadyState = HTMLTrackElement::NONE;
}
void
TextTrack::Update(double aTime)
{
if (mCueList) {
mCueList->Update(aTime);
}
}
JSObject*
TextTrack::WrapObject(JSContext* aCx, JS::Handle<JSObject*> aScope)
{
return TextTrackBinding::Wrap(aCx, aScope, this);
}
void
TextTrack::SetMode(TextTrackMode aValue)
{
if (mMode != aValue) {
mMode = aValue;
if (mMediaElement) {
mMediaElement->TextTracks()->CreateAndDispatchChangeEvent();
}
}
}
void
TextTrack::AddCue(TextTrackCue& aCue)
{
mCueList->AddCue(aCue);
mMediaElement->AddCue(aCue);
SetDirty();
}
void
TextTrack::RemoveCue(TextTrackCue& aCue, ErrorResult& aRv)
{
mCueList->RemoveCue(aCue, aRv);
SetDirty();
}
void
TextTrack::CueChanged(TextTrackCue& aCue)
{
//XXX: Implement Cue changed. Bug 867823.
}
void
TextTrack::AddRegion(TextTrackRegion& aRegion)
{
TextTrackRegion* region = mRegionList->GetRegionById(aRegion.Id());
if (!region) {
aRegion.SetTextTrack(this);
mRegionList->AddTextTrackRegion(&aRegion);
return;
}
region->CopyValues(aRegion);
}
void
TextTrack::RemoveRegion(const TextTrackRegion& aRegion, ErrorResult& aRv)
{
if (!mRegionList->GetRegionById(aRegion.Id())) {
aRv.Throw(NS_ERROR_DOM_NOT_FOUND_ERR);
return;
}
mRegionList->RemoveTextTrackRegion(aRegion);
}
TextTrackCueList*
TextTrack::GetActiveCues()
{
if (mMode == TextTrackMode::Disabled || !mMediaElement) {
return nullptr;
}
// 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 = mMediaElement->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);
}
}
// 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]);
}
}
return mActiveCueList;
}
uint16_t
TextTrack::ReadyState() const
{
return mReadyState;
}
void
TextTrack::SetReadyState(uint16_t aState)
{
mReadyState = aState;
if (mMediaElement && (mReadyState == HTMLTrackElement::LOADED ||
mReadyState == HTMLTrackElement::ERROR)) {
mMediaElement->RemoveTextTrack(this, true);
}
}
} // namespace dom
} // namespace mozilla