static int textTrackLanguageSelectionScore(const TextTrack& track)
{
if (track.language().isEmpty())
return 0;
Vector<AtomicString> languages = userPreferredLanguages();
size_t languageMatchIndex = indexOfBestMatchingLanguageInList(track.language(), languages);
if (languageMatchIndex >= languages.size())
return 0;
return languages.size() - languageMatchIndex;
}
void AutomaticTrackSelection::perform(TextTrackList& textTracks)
{
TrackGroup captionAndSubtitleTracks(TrackGroup::CaptionsAndSubtitles);
TrackGroup descriptionTracks(TrackGroup::Description);
TrackGroup chapterTracks(TrackGroup::Chapter);
TrackGroup metadataTracks(TrackGroup::Metadata);
for (size_t i = 0; i < textTracks.length(); ++i) {
TextTrack* textTrack = textTracks.item(i);
if (!textTrack)
continue;
String kind = textTrack->kind();
TrackGroup* currentGroup;
if (kind == TextTrack::subtitlesKeyword() || kind == TextTrack::captionsKeyword()) {
currentGroup = &captionAndSubtitleTracks;
} else if (kind == TextTrack::descriptionsKeyword()) {
currentGroup = &descriptionTracks;
} else if (kind == TextTrack::chaptersKeyword()) {
currentGroup = &chapterTracks;
} else {
ASSERT(kind == TextTrack::metadataKeyword());
currentGroup = &metadataTracks;
}
if (!currentGroup->visibleTrack && textTrack->mode() == TextTrack::showingKeyword())
currentGroup->visibleTrack = textTrack;
if (!currentGroup->defaultTrack && textTrack->isDefault())
currentGroup->defaultTrack = textTrack;
// Do not add this track to the group if it has already been automatically configured
// as we only want to perform selection once per track so that adding another track
// after the initial configuration doesn't reconfigure every track - only those that
// should be changed by the new addition. For example all metadata tracks are
// disabled by default, and we don't want a track that has been enabled by script
// to be disabled automatically when a new metadata track is added later.
if (textTrack->hasBeenConfigured())
continue;
if (textTrack->language().length())
currentGroup->hasSrcLang = true;
currentGroup->tracks.append(textTrack);
}
if (captionAndSubtitleTracks.tracks.size())
performAutomaticTextTrackSelection(captionAndSubtitleTracks);
if (descriptionTracks.tracks.size())
performAutomaticTextTrackSelection(descriptionTracks);
if (chapterTracks.tracks.size())
performAutomaticTextTrackSelection(chapterTracks);
if (metadataTracks.tracks.size())
enableDefaultMetadataTextTracks(metadataTracks);
}
static v8::Handle<v8::Value> languageAttrGetter(v8::Local<v8::String> name, const v8::AccessorInfo& info)
{
TextTrack* imp = V8TextTrack::toNative(info.Holder());
return v8String(imp->language(), info.GetIsolate());
}
void MediaControlClosedCaptionsTrackListElement::rebuildTrackListMenu()
{
#if ENABLE(VIDEO_TRACK)
// Remove any existing content.
removeChildren();
m_menuItems.clear();
m_trackListHasChanged = false;
if (!mediaController()->hasClosedCaptions())
return;
HTMLMediaElement* mediaElement = toParentMediaElement(this);
if (!mediaElement)
return;
TextTrackList* trackList = mediaElement->textTracks();
if (!trackList || !trackList->length())
return;
Document* doc = document();
RefPtr<Element> captionsSection = doc->createElement(sectionTag, ASSERT_NO_EXCEPTION);
RefPtr<Element> captionsHeader = doc->createElement(h3Tag, ASSERT_NO_EXCEPTION);
captionsHeader->appendChild(doc->createTextNode(textTrackClosedCaptionsText()));
captionsSection->appendChild(captionsHeader);
RefPtr<Element> captionsMenuList = doc->createElement(ulTag, ASSERT_NO_EXCEPTION);
RefPtr<Element> subtitlesSection = doc->createElement(sectionTag, ASSERT_NO_EXCEPTION);
RefPtr<Element> subtitlesHeader = doc->createElement(h3Tag, ASSERT_NO_EXCEPTION);
subtitlesHeader->appendChild(doc->createTextNode(textTrackSubtitlesText()));
subtitlesSection->appendChild(subtitlesHeader);
RefPtr<Element> subtitlesMenuList = doc->createElement(ulTag, ASSERT_NO_EXCEPTION);
RefPtr<Element> trackItem;
trackItem = doc->createElement(liTag, ASSERT_NO_EXCEPTION);
trackItem->appendChild(doc->createTextNode(textTrackOffText()));
trackItem->setAttribute(trackIndexAttributeName(), textTracksOffAttrValue, ASSERT_NO_EXCEPTION);
captionsMenuList->appendChild(trackItem);
m_menuItems.append(trackItem);
trackItem = doc->createElement(liTag, ASSERT_NO_EXCEPTION);
trackItem->appendChild(doc->createTextNode(textTrackOffText()));
trackItem->setAttribute(trackIndexAttributeName(), textTracksOffAttrValue, ASSERT_NO_EXCEPTION);
subtitlesMenuList->appendChild(trackItem);
m_menuItems.append(trackItem);
bool hasCaptions = false;
bool hasSubtitles = false;
for (unsigned i = 0, length = trackList->length(); i < length; ++i) {
TextTrack* track = trackList->item(i);
trackItem = doc->createElement(liTag, ASSERT_NO_EXCEPTION);
// Add a custom attribute to the <li> element which will allow
// us to easily associate the user tapping here with the
// track. Since this list is rebuilt if the tracks change, we
// should always be in sync.
trackItem->setAttribute(trackIndexAttributeName(), String::number(i), ASSERT_NO_EXCEPTION);
AtomicString labelText = track->label();
if (labelText.isNull() || labelText.isEmpty())
labelText = displayNameForLanguageLocale(track->language());
if (labelText.isNull() || labelText.isEmpty())
labelText = textTrackNoLabelText();
trackItem->appendChild(doc->createTextNode(labelText));
if (track->kind() == track->captionsKeyword()) {
hasCaptions = true;
insertTextTrackMenuItemIntoSortedContainer(trackItem, captionsMenuList);
}
if (track->kind() == track->subtitlesKeyword()) {
hasSubtitles = true;
insertTextTrackMenuItemIntoSortedContainer(trackItem, subtitlesMenuList);
}
m_menuItems.append(trackItem);
}
captionsSection->appendChild(captionsMenuList);
subtitlesSection->appendChild(subtitlesMenuList);
if (hasCaptions)
appendChild(captionsSection);
if (hasSubtitles)
appendChild(subtitlesSection);
updateDisplay();
#endif
}
