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b4db8f11c5
...giving tracks a kind attribute, and renaming name to label. Demuxers will need to determine the kind attribute, since the spec for sourcing tracks requires us to select based on info we don't expose.
58 lines
2.7 KiB
C++
58 lines
2.7 KiB
C++
/*
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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_kind(track.kind())
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, m_label(track.label())
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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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