tdesktop/Telegram/SourceFiles/media/streaming/media_streaming_loader.h

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/*
This file is part of Telegram Desktop,
the official desktop application for the Telegram messaging service.
For license and copyright information please follow this link:
https://github.com/telegramdesktop/tdesktop/blob/master/LEGAL
*/
#pragma once
namespace Storage {
class StreamedFileDownloader;
} // namespace Storage
namespace Media {
namespace Streaming {
struct LoadedPart {
int offset = 0;
QByteArray bytes;
static constexpr auto kFailedOffset = -1;
[[nodiscard]] bool valid(int size) const;
};
class Loader {
public:
static constexpr auto kPartSize = 128 * 1024;
[[nodiscard]] virtual Storage::Cache::Key baseCacheKey() const = 0;
[[nodiscard]] virtual int size() const = 0;
virtual void load(int offset) = 0;
virtual void cancel(int offset) = 0;
virtual void resetPriorities() = 0;
virtual void setPriority(int priority) = 0;
virtual void stop() = 0;
// Remove from queue if no requests are in progress.
virtual void tryRemoveFromQueue() = 0;
// Parts will be sent from the main thread.
[[nodiscard]] virtual rpl::producer<LoadedPart> parts() const = 0;
virtual void attachDownloader(
not_null<Storage::StreamedFileDownloader*> downloader) = 0;
virtual void clearAttachedDownloader() = 0;
virtual ~Loader() = default;
};
class PriorityQueue {
public:
bool add(int value);
bool remove(int value);
void resetPriorities();
[[nodiscard]] bool empty() const;
[[nodiscard]] std::optional<int> front() const;
[[nodiscard]] std::optional<int> take();
[[nodiscard]] base::flat_set<int> takeInRange(int from, int till);
void clear();
private:
struct Entry {
int value = 0;
int priority = 0;
};
friend bool operator<(const Entry &a, const Entry &b);
base::flat_set<Entry> _data;
int _priority = 0;
};
} // namespace Streaming
} // namespace Media