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51c3f7c41e
The segments are parsed for the SourceBufferProcessor by the WebMByteStreamParser. It parses the initialization segment to update its internal set of tracks, then SourceBufferProcessor/SourceBuffer set them up for playback. When a media segment is received, it also parses as much of it as is available, returning all the coded frames found so far. SourceBufferProcessor then tells TrackBufferDemuxer to remove any overlapping frames and insert the new ones. TrackBufferDemuxer implements the Demuxer interface in terms of the coded frame store maintained by the SourceBufferProcessor. It returns the frames in decode order when requested by a data provider. When a is needed, it finds the keyframe prior to the target timestamp, and checks that there are no gaps in data up to the target timestamp. If there are any gaps, it blocks until the gaps are gone.
89 lines
3.1 KiB
C++
89 lines
3.1 KiB
C++
/*
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* Copyright (c) 2024, Jelle Raaijmakers <jelle@ladybird.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#pragma once
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#include <LibWeb/Bindings/MediaSourcePrototype.h>
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#include <LibWeb/DOM/EventTarget.h>
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namespace Web::MediaSourceExtensions {
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// https://w3c.github.io/media-source/#dom-mediasource
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class MediaSource : public DOM::EventTarget {
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WEB_PLATFORM_OBJECT(MediaSource, DOM::EventTarget);
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GC_DECLARE_ALLOCATOR(MediaSource);
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public:
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[[nodiscard]] static WebIDL::ExceptionOr<GC::Ref<MediaSource>> construct_impl(JS::Realm&);
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void queue_a_media_source_task(GC::Ref<GC::Function<void()>>);
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Bindings::ReadyState ready_state() const;
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bool ready_state_is_closed() const;
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void set_has_ever_been_attached();
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void set_ready_state_to_open_and_fire_sourceopen_event();
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GC::Ref<SourceBufferList> source_buffers();
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GC::Ref<SourceBufferList> active_source_buffers();
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Utf16String next_track_id();
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// https://w3c.github.io/media-source/#dom-mediasource-canconstructindedicatedworker
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static bool can_construct_in_dedicated_worker(JS::VM&) { return false; }
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void set_assigned_to_media_element(Badge<HTML::HTMLMediaElement>, HTML::HTMLMediaElement&);
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void unassign_from_media_element(Badge<HTML::HTMLMediaElement>);
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GC::Ptr<HTML::HTMLMediaElement> media_element_assigned_to() { return m_media_element_assigned_to; }
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void set_onsourceopen(GC::Ptr<WebIDL::CallbackType>);
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GC::Ptr<WebIDL::CallbackType> onsourceopen();
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void set_onsourceended(GC::Ptr<WebIDL::CallbackType>);
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GC::Ptr<WebIDL::CallbackType> onsourceended();
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void set_onsourceclose(GC::Ptr<WebIDL::CallbackType>);
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GC::Ptr<WebIDL::CallbackType> onsourceclose();
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WebIDL::ExceptionOr<GC::Ref<SourceBuffer>> add_source_buffer(String const& type);
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WebIDL::ExceptionOr<void> end_of_stream(Optional<Bindings::EndOfStreamError> const& error = {});
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void run_end_of_stream_algorithm(Badge<SourceBuffer>, Optional<Bindings::EndOfStreamError> const& error) { run_end_of_stream_algorithm(error); }
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// https://w3c.github.io/media-source/#dom-mediasource-duration
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double duration() const;
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WebIDL::ExceptionOr<void> set_duration(double);
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// https://w3c.github.io/media-source/#duration-change-algorithm
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void run_duration_change_algorithm(double new_duration);
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static bool is_type_supported(String const&);
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static bool is_type_supported(JS::VM&, String const& type) { return is_type_supported(type); }
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protected:
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MediaSource(JS::Realm&);
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virtual ~MediaSource() override;
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virtual void initialize(JS::Realm&) override;
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virtual void visit_edges(Cell::Visitor&) override;
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private:
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// https://w3c.github.io/media-source/#end-of-stream-algorithm
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void run_end_of_stream_algorithm(Optional<Bindings::EndOfStreamError> const&);
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Bindings::ReadyState m_ready_state { Bindings::ReadyState::Closed };
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bool m_has_ever_been_attached { false };
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GC::Ptr<HTML::HTMLMediaElement> m_media_element_assigned_to;
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GC::Ref<SourceBufferList> m_source_buffers;
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GC::Ref<SourceBufferList> m_active_source_buffers;
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double m_duration { NAN };
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u64 m_next_track_id = 1;
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};
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}
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