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LibWeb: Implement assignment of MediaSource to HTMLMediaElement src

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Also, support the srcObject attribute, and fire the sourceopen event
at the MediaSource.
This commit is contained in:
Zaggy1024
2026-03-26 02:06:18 -05:00
committed by Gregory Bertilson
parent 6dcfe20f1e
commit d960c1eaf5
Notes: github-actions[bot] 2026-04-01 07:56:26 +00:00 
Author: https://github.com/Zaggy1024
Commit: https://github.com/LadybirdBrowser/ladybird/commit/d960c1eaf56
Pull-request: https://github.com/LadybirdBrowser/ladybird/pull/8655
Reviewed-by: https://github.com/tcl3
7 changed files with 371 additions and 56 deletions
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56
Libraries/LibWeb/MediaSourceExtensions/MediaSource.cpp
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@@ -6,12 +6,16 @@
#include <LibWeb/Bindings/Intrinsics.h>
#include <LibWeb/Bindings/MediaSourcePrototype.h>
#include <LibWeb/DOM/Event.h>
#include <LibWeb/HTML/HTMLMediaElement.h>
#include <LibWeb/MediaSourceExtensions/EventNames.h>
#include <LibWeb/MediaSourceExtensions/MediaSource.h>
#include <LibWeb/MimeSniff/MimeType.h>
namespace Web::MediaSourceExtensions {
using Bindings::ReadyState;
GC_DEFINE_ALLOCATOR(MediaSource);
WebIDL::ExceptionOr<GC::Ref<MediaSource>> MediaSource::construct_impl(JS::Realm& realm)
@@ -32,6 +36,58 @@ void MediaSource::initialize(JS::Realm& realm)
Base::initialize(realm);
}
void MediaSource::visit_edges(Visitor& visitor)
{
Base::visit_edges(visitor);
visitor.visit(m_media_element_assigned_to);
}
void MediaSource::queue_a_media_source_task(GC::Ref<GC::Function<void()>> task)
{
// FIXME: The MSE spec does not say what task source to use for its tasks. Should this use the media element's
// task source? We may not have access to it if we're in a worker.
GC::Ptr<DOM::Document> document = nullptr;
if (media_element_assigned_to() != nullptr)
document = media_element_assigned_to()->document();
HTML::queue_a_task(HTML::Task::Source::Unspecified, HTML::main_thread_event_loop(), document, task);
}
ReadyState MediaSource::ready_state() const
{
return m_ready_state;
}
bool MediaSource::ready_state_is_closed() const
{
return m_ready_state == ReadyState::Closed;
}
void MediaSource::set_has_ever_been_attached()
{
m_has_ever_been_attached = true;
}
void MediaSource::set_ready_state_to_open_and_fire_sourceopen_event()
{
m_ready_state = ReadyState::Open;
queue_a_media_source_task(GC::create_function(heap(), [this] {
auto event = DOM::Event::create(realm(), EventNames::sourceopen);
dispatch_event(event);
}));
}
void MediaSource::set_assigned_to_media_element(Badge<HTML::HTMLMediaElement>, HTML::HTMLMediaElement& media_element)
{
m_media_element_assigned_to = media_element;
}
void MediaSource::unassign_from_media_element(Badge<HTML::HTMLMediaElement>)
{
m_media_element_assigned_to = nullptr;
}
// https://w3c.github.io/media-source/#dom-mediasource-onsourceopen
void MediaSource::set_onsourceopen(GC::Ptr<WebIDL::CallbackType> event_handler)
{