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LibWeb: Indicate that we may be able to play video MIME types

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Timothy Flynn 2023-04-04 14:20:42 -04:00 • committed by Linus Groh
parent e2f32e6ab3
commit 5f9fc5aedc
2 changed files with 14 additions and 6 deletions
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18
Userland/Libraries/LibWeb/HTML/HTMLMediaElement.cpp
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@ -22,6 +22,7 @@
#include <LibWeb/HTML/TrackEvent.h>
#include <LibWeb/HTML/VideoTrack.h>
#include <LibWeb/HTML/VideoTrackList.h>
#include <LibWeb/MimeSniff/MimeType.h>
namespace Web::HTML {
@ -66,8 +67,10 @@ void HTMLMediaElement::parse_attribute(DeprecatedFlyString const& name, Deprecat
}
// https://html.spec.whatwg.org/multipage/media.html#dom-navigator-canplaytype
Bindings::CanPlayTypeResult HTMLMediaElement::can_play_type(DeprecatedString const& type) const
WebIDL::ExceptionOr<Bindings::CanPlayTypeResult> HTMLMediaElement::can_play_type(DeprecatedString const& type) const
{
auto& vm = this->vm();
// The canPlayType(type) method must:
// - return the empty string if type is a type that the user agent knows it cannot render or is the type "application/octet-stream"
// - return "probably" if the user agent is confident that the type represents a media resource that it can render if used in with this audio or video element
@ -75,10 +78,15 @@ Bindings::CanPlayTypeResult HTMLMediaElement::can_play_type(DeprecatedString con
// Generally, a user agent should never return "probably" for a type that allows the codecs parameter if that parameter is not present.
if (type == "application/octet-stream"sv)
return Bindings::CanPlayTypeResult::Empty;
// FIXME: Eventually we should return `Maybe` here, but for now `Empty` is our best bet :^)
// Being honest here leads to some apps and frameworks skipping things like audio loading,
// which for the time being would create more issues than it solves - e.g. endless waiting
// for audio that will never load.
auto mime_type = TRY_OR_THROW_OOM(vm, MimeSniff::MimeType::parse(type));
if (mime_type.has_value() && mime_type->type() == "video"sv) {
if (mime_type->subtype() == "webm"sv)
return Bindings::CanPlayTypeResult::Probably;
return Bindings::CanPlayTypeResult::Maybe;
}
return Bindings::CanPlayTypeResult::Empty;
}