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https://github.com/LadybirdBrowser/ladybird
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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.
88 lines
2.8 KiB
C++
88 lines
2.8 KiB
C++
/*
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* Copyright (c) 2024, Jelle Raaijmakers <jelle@ladybird.org>
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* Copyright (c) 2026, 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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#pragma once
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#include <AK/NonnullRefPtr.h>
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#include <LibWeb/Bindings/SourceBufferPrototype.h>
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#include <LibWeb/DOM/EventTarget.h>
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namespace Web::MediaSourceExtensions {
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class SourceBufferProcessor;
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struct InitializationSegmentData;
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// https://w3c.github.io/media-source/#dom-sourcebuffer
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class SourceBuffer : public DOM::EventTarget {
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WEB_PLATFORM_OBJECT(SourceBuffer, DOM::EventTarget);
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GC_DECLARE_ALLOCATOR(SourceBuffer);
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public:
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void set_onupdatestart(GC::Ptr<WebIDL::CallbackType>);
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GC::Ptr<WebIDL::CallbackType> onupdatestart();
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void set_onupdate(GC::Ptr<WebIDL::CallbackType>);
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GC::Ptr<WebIDL::CallbackType> onupdate();
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void set_onupdateend(GC::Ptr<WebIDL::CallbackType>);
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GC::Ptr<WebIDL::CallbackType> onupdateend();
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void set_onerror(GC::Ptr<WebIDL::CallbackType>);
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GC::Ptr<WebIDL::CallbackType> onerror();
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void set_onabort(GC::Ptr<WebIDL::CallbackType>);
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GC::Ptr<WebIDL::CallbackType> onabort();
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// https://w3c.github.io/media-source/#dom-sourcebuffer-mode
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Bindings::AppendMode mode() const;
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WebIDL::ExceptionOr<void> set_mode(Bindings::AppendMode);
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// https://w3c.github.io/media-source/#dom-sourcebuffer-updating
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bool updating() const;
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void set_content_type(String const& type);
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// https://w3c.github.io/media-source/#addsourcebuffer-method
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WebIDL::ExceptionOr<void> append_buffer(GC::Root<WebIDL::BufferSource> const&);
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// https://w3c.github.io/media-source/#dom-sourcebuffer-changetype
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WebIDL::ExceptionOr<void> change_type(String const& type);
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void set_reached_end_of_stream(Badge<MediaSource>);
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void clear_reached_end_of_stream(Badge<MediaSource>);
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protected:
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SourceBuffer(JS::Realm&, MediaSource&);
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virtual ~SourceBuffer() 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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WebIDL::ExceptionOr<void> prepare_append();
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void run_buffer_append_algorithm();
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void run_append_error_algorithm();
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void on_first_initialization_segment_processed(InitializationSegmentData const&);
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void update_ready_state_and_duration_after_coded_frame_processing();
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void finish_buffer_append();
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GC::Ref<MediaSource> m_media_source;
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NonnullRefPtr<SourceBufferProcessor> m_processor;
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// https://w3c.github.io/media-source/#dom-sourcebuffer-audiotracks
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GC::Ref<HTML::AudioTrackList> m_audio_tracks;
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// https://w3c.github.io/media-source/#dom-sourcebuffer-videotracks
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GC::Ref<HTML::VideoTrackList> m_video_tracks;
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// https://w3c.github.io/media-source/#dom-sourcebuffer-texttracks
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GC::Ref<HTML::TextTrackList> m_text_tracks;
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};
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}
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