64 lines
1.3 KiB
C++
64 lines
1.3 KiB
C++
/*
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This file is part of Telegram Desktop,
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the official desktop application for the Telegram messaging service.
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For license and copyright information please follow this link:
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https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
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*/
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#pragma once
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namespace Media {
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namespace Streaming {
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struct LoadedPart {
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int offset = 0;
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QByteArray bytes;
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static constexpr auto kFailedOffset = -1;
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};
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class Loader {
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public:
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static constexpr auto kPartSize = 128 * 1024;
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[[nodiscard]] virtual auto baseCacheKey() const
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-> std::optional<Storage::Cache::Key> = 0;
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[[nodiscard]] virtual int size() const = 0;
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virtual void load(int offset) = 0;
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virtual void cancel(int offset) = 0;
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virtual void increasePriority() = 0;
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virtual void stop() = 0;
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// Parts will be sent from the main thread.
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[[nodiscard]] virtual rpl::producer<LoadedPart> parts() const = 0;
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virtual ~Loader() = default;
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};
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class PriorityQueue {
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public:
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bool add(int value);
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bool remove(int value);
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void increasePriority();
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std::optional<int> front() const;
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std::optional<int> take();
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base::flat_set<int> takeInRange(int from, int till);
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void clear();
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private:
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struct Entry {
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int value = 0;
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int priority = 0;
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};
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friend bool operator<(const Entry &a, const Entry &b);
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base::flat_set<Entry> _data;
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int _priority = 0;
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};
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} // namespace Streaming
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} // namespace Media
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