ladybird/Userland/Libraries/LibVideo/Containers/Demuxer.h

/*
 * Copyright (c) 2022, Gregory Bertilson <zaggy1024@gmail.com>
 *
 * SPDX-License-Identifier: BSD-2-Clause
 */

#pragma once

#include <AK/NonnullOwnPtr.h>
#include <LibCore/EventReceiver.h>
#include <LibVideo/CodecID.h>
#include <LibVideo/DecoderError.h>
#include <LibVideo/Sample.h>
#include <LibVideo/Track.h>

namespace Video {

class Demuxer {
public:
    virtual ~Demuxer() = default;

    virtual DecoderErrorOr<Vector<Track>> get_tracks_for_type(TrackType type) = 0;

    DecoderErrorOr<NonnullOwnPtr<VideoSample>> get_next_video_sample_for_track(Track track)
    {
        VERIFY(track.type() == TrackType::Video);
        auto sample = TRY(get_next_sample_for_track(track));
        VERIFY(sample->is_video_sample());
        return sample.release_nonnull<VideoSample>();
    }

    virtual DecoderErrorOr<CodecID> get_codec_id_for_track(Track track) = 0;

    // Returns the timestamp of the keyframe that was seeked to.
    // The value is `Optional` to allow the demuxer to decide not to seek so that it can keep its position
    // in the case that the timestamp is closer to the current time than the nearest keyframe.
    virtual DecoderErrorOr<Optional<Duration>> seek_to_most_recent_keyframe(Track track, Duration timestamp, Optional<Duration> earliest_available_sample = OptionalNone()) = 0;

    virtual DecoderErrorOr<Duration> duration() = 0;

protected:
    virtual DecoderErrorOr<NonnullOwnPtr<Sample>> get_next_sample_for_track(Track track) = 0;
};

}