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/*
* Copyright (c) 2021, Hunter Salyer <thefalsehonesty@gmail.com>
* Copyright (c) 2022, Gregory Bertilson <Zaggy1024@gmail.com>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#pragma once
#include <AK/Concepts.h>
#include <AK/Debug.h>
#include <AK/IntegralMath.h>
#include <AK/NonnullOwnPtrVector.h>
#include <AK/Optional.h>
#include <AK/OwnPtr.h>
#include <LibCore/MappedFile.h>
#include <LibVideo/DecoderError.h>
#include "Document.h"
namespace Video::Matroska {
class SampleIterator;
class Streamer;
class Reader {
public:
typedef Function<DecoderErrorOr<IterationDecision>(TrackEntry const&)> TrackEntryCallback;
static DecoderErrorOr<Reader> from_file(StringView path);
static DecoderErrorOr<Reader> from_data(ReadonlyBytes data);
EBMLHeader const& header() const { return m_header.value(); }
DecoderErrorOr<SegmentInformation> segment_information();
DecoderErrorOr<void> for_each_track(TrackEntryCallback);
DecoderErrorOr<void> for_each_track_of_type(TrackEntry::TrackType, TrackEntryCallback);
DecoderErrorOr<TrackEntry> track_for_track_number(u64);
DecoderErrorOr<size_t> track_count();
DecoderErrorOr<SampleIterator> create_sample_iterator(u64 track_number);
DecoderErrorOr<void> seek_to_random_access_point(SampleIterator&, Time);
DecoderErrorOr<Optional<Vector<CuePoint> const&>> cue_points_for_track(u64 track_number);
DecoderErrorOr<bool> has_cues_for_track(u64 track_number);
private:
Reader(ReadonlyBytes data)
: m_data(data)
{
}
DecoderErrorOr<void> parse_initial_data();
DecoderErrorOr<Optional<size_t>> find_first_top_level_element_with_id([[maybe_unused]] StringView element_name, u32 element_id);
DecoderErrorOr<void> ensure_tracks_are_parsed();
DecoderErrorOr<void> parse_tracks(Streamer&);
DecoderErrorOr<void> parse_cues(Streamer&);
DecoderErrorOr<void> ensure_cues_are_parsed();
DecoderErrorOr<void> seek_to_cue_for_timestamp(SampleIterator&, Time const&);
RefPtr<Core::MappedFile> m_mapped_file;
ReadonlyBytes m_data;
Optional<EBMLHeader> m_header;
size_t m_segment_contents_position { 0 };
size_t m_segment_contents_size { 0 };
HashMap<u32, size_t> m_seek_entries;
size_t m_last_top_level_element_position { 0 };
Optional<SegmentInformation> m_segment_information;
OrderedHashMap<u64, TrackEntry> m_tracks;
// The vectors must be sorted by timestamp at all times.
HashMap<u64, Vector<CuePoint>> m_cues;
bool m_cues_have_been_parsed { false };
};
class SampleIterator {
public:
DecoderErrorOr<Block> next_block();
Cluster const& current_cluster() { return *m_current_cluster; }
Time const& last_timestamp() { return m_last_timestamp; }
private:
friend class Reader;
SampleIterator(RefPtr<Core::MappedFile> file, ReadonlyBytes data, TrackEntry track, u64 timestamp_scale, size_t position)
: m_file(move(file))
, m_data(data)
, m_track(move(track))
, m_segment_timestamp_scale(timestamp_scale)
, m_position(position)
{
}
DecoderErrorOr<void> set_position(size_t position);
DecoderErrorOr<void> seek_to_cue_point(CuePoint const& cue_point);
RefPtr<Core::MappedFile> m_file;
ReadonlyBytes m_data;
TrackEntry m_track;
u64 m_segment_timestamp_scale { 0 };
// Must always point to an element ID or the end of the stream.
size_t m_position { 0 };
Time m_last_timestamp { Time::min() };
Optional<Cluster> m_current_cluster;
};
class Streamer {
public:
Streamer(ReadonlyBytes data)
: m_data(data)
{
}
u8 const* data() { return m_data.data() + m_position; }
char const* data_as_chars() { return reinterpret_cast<char const*>(data()); }
size_t octets_read() { return m_octets_read.last(); }
void push_octets_read() { m_octets_read.append(0); }
void pop_octets_read()
{
auto popped = m_octets_read.take_last();
if (!m_octets_read.is_empty())
m_octets_read.last() += popped;
}
ErrorOr<u8> read_octet();
ErrorOr<i16> read_i16();
ErrorOr<u64> read_variable_size_integer(bool mask_length = true);
ErrorOr<i64> read_variable_size_signed_integer();
ErrorOr<u64> read_u64();
ErrorOr<double> read_float();
ErrorOr<DeprecatedString> read_string();
ErrorOr<void> read_unknown_element();
ErrorOr<ReadonlyBytes> read_raw_octets(size_t num_octets);
size_t position() const { return m_position; }
size_t remaining() const { return m_data.size() - position(); }
bool at_end() const { return remaining() == 0; }
bool has_octet() const { return remaining() >= 1; }
ErrorOr<void> seek_to_position(size_t position);
private:
ReadonlyBytes m_data;
size_t m_position { 0 };
Vector<size_t> m_octets_read { 0 };
};
}
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