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58 lines
2.6 KiB
C++
58 lines
2.6 KiB
C++
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/*
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* Copyright (c) 2025, Gregory Bertilson <gregory@ladybird.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <LibUnicode/Locale.h>
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#include <LibWeb/HTML/HTMLMediaElement.h>
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#include <LibWeb/HTML/MediaTrackBase.h>
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namespace Web::HTML {
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MediaTrackBase::MediaTrackBase(JS::Realm& realm, GC::Ref<HTMLMediaElement> media_element, Media::Track const& track)
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: PlatformObject(realm)
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, m_media_element(media_element)
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, m_track_in_playback_manager(track)
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, m_id(Utf16String::number(track.identifier()))
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, m_label(track.name())
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{
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// https://html.spec.whatwg.org/multipage/media.html#dom-audiotrack-language
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// https://html.spec.whatwg.org/multipage/media.html#dom-videotrack-language
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// The AudioTrack language and VideoTrack language attributes must return the BCP 47 language tag of the language
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// of the track, if it has one, or the empty string otherwise. If the user agent is not able to express that language
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// as a BCP 47 language tag (for example because the language information in the media resource's format is a free-form
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// string without a defined interpretation), then the method must return the empty string, as if the track had no
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// language.
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m_language = [&] {
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auto locale = Unicode::parse_unicode_locale_id(track.language().to_utf8());
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if (!locale.has_value())
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return Utf16String();
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auto language = locale->to_string();
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// NOTE: We specifically want to exclude "und" here, as RFC 5646 says:
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//
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// The 'und' (Undetermined) primary language subtag identifies linguistic content whose language is not
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// determined. This subtag SHOULD NOT be used unless a language tag is required and language information is
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// not available or cannot be determined. Omitting the language tag (where permitted) is preferred. The 'und'
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// subtag might be useful for protocols that require a language tag to be provided or where a primary language
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// subtag is required (such as in "und-Latn"). The 'und' subtag MAY also be useful when matching language tags
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// in certain situations.
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//
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// Matroska's TrackEntry->Language element is required, and will use "und" as a placeholder as mentioned above. We
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// don't want to return anything when that placeholder is found:
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if (language == "und")
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return Utf16String();
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return Utf16String::from_utf8_without_validation(language);
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}();
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}
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MediaTrackBase::~MediaTrackBase() = default;
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void MediaTrackBase::visit_edges(Cell::Visitor& visitor)
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{
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Base::visit_edges(visitor);
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visitor.visit(m_media_element);
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}
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}
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