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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.
79 lines
2.8 KiB
C++
79 lines
2.8 KiB
C++
/*
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* Copyright (c) 2026-present, the Ladybird developers.
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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/OwnPtr.h>
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#include <AK/Vector.h>
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#include <LibMedia/Containers/Matroska/Document.h>
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#include <LibMedia/Containers/Matroska/Utilities.h>
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#include <LibMedia/Track.h>
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#include <LibWeb/MediaSourceExtensions/ByteStreamParser.h>
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namespace Web::MediaSourceExtensions {
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// https://w3c.github.io/mse-byte-stream-format-webm/
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class WebMByteStreamParser final : public ByteStreamParser {
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public:
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WebMByteStreamParser();
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virtual ~WebMByteStreamParser() override;
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virtual Media::DecoderErrorOr<void> skip_ignored_bytes(Media::MediaStreamCursor&) override;
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virtual Media::DecoderErrorOr<SegmentType> sniff_segment_type(Media::MediaStreamCursor&) override;
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virtual Media::DecoderErrorOr<void> parse_initialization_segment(Media::MediaStreamCursor&) override;
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virtual Media::DecoderErrorOr<ParseMediaSegmentResult> parse_media_segment(Media::MediaStreamCursor&) override;
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virtual Optional<AK::Duration> duration() const override
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{
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if (!m_segment_information.has_value())
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return {};
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auto duration = m_segment_information->duration();
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if (!duration.has_value())
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return {};
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return duration;
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}
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virtual Media::CodecID codec_id_for_track(u64 track_number) const override
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{
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auto entry = m_track_entries.get(track_number);
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if (!entry.has_value())
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return Media::CodecID::Unknown;
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return Media::Matroska::codec_id_from_matroska_id_string((*entry)->codec_id());
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}
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virtual ReadonlyBytes codec_initialization_data_for_track(u64 track_number) const override
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{
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auto entry = m_track_entries.get(track_number);
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if (!entry.has_value())
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return {};
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return (*entry)->codec_private_data();
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}
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virtual Vector<Media::Track> const& video_tracks() const override { return m_video_tracks; }
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virtual Vector<Media::Track> const& audio_tracks() const override { return m_audio_tracks; }
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virtual Vector<Media::Track> const& text_tracks() const override { return m_text_tracks; }
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private:
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Optional<Media::Matroska::SegmentInformation> m_segment_information;
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OrderedHashMap<u64, NonnullRefPtr<Media::Matroska::TrackEntry>> m_track_entries;
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Media::Matroska::TrackBlockContexts m_track_block_contexts;
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Vector<Media::Track> m_video_tracks;
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Vector<Media::Track> m_audio_tracks;
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Vector<Media::Track> m_text_tracks;
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struct MediaSegmentParsingData {
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AK::Duration timecode;
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Optional<size_t> remaining_bytes;
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HashTable<u64> seen_track_numbers {};
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AK::Duration last_block_timestamp { AK::Duration::min() };
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};
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Optional<MediaSegmentParsingData> m_current_media_segment_data;
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bool m_cluster_has_been_read { false };
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};
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}
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