tdesktop/Telegram/SourceFiles/media/streaming/media_streaming_file.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
#include "media/streaming/media_streaming_common.h"
#include "media/streaming/media_streaming_utility.h"
#include "media/streaming/media_streaming_reader.h"
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#include "ffmpeg/ffmpeg_utility.h"
#include "base/bytes.h"
#include "base/weak_ptr.h"
#include <thread>
namespace Media {
namespace Streaming {
class FileDelegate;
class File final {
public:
explicit File(std::shared_ptr<Reader> reader);
File(const File &other) = delete;
File &operator=(const File &other) = delete;
void start(not_null<FileDelegate*> delegate, crl::time position);
void wake();
void stop(bool stillActive = false);
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[[nodiscard]] bool isRemoteLoader() const;
void setLoaderPriority(int priority);
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~File();
private:
class Context final : public base::has_weak_ptr {
public:
Context(not_null<FileDelegate*> delegate, not_null<Reader*> reader);
~Context();
void start(crl::time position);
void readNextPacket();
void interrupt();
void wake();
[[nodiscard]] bool interrupted() const;
[[nodiscard]] bool failed() const;
[[nodiscard]] bool finished() const;
void stopStreamingAsync();
private:
enum class SleepPolicy {
Allowed,
Disallowed,
};
static int Read(void *opaque, uint8_t *buffer, int bufferSize);
static int64_t Seek(void *opaque, int64_t offset, int whence);
[[nodiscard]] int read(bytes::span buffer);
[[nodiscard]] int64_t seek(int64_t offset, int whence);
[[nodiscard]] bool unroll() const;
void logError(QLatin1String method);
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void logError(QLatin1String method, FFmpeg::AvErrorWrap error);
void logFatal(QLatin1String method);
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void logFatal(QLatin1String method, FFmpeg::AvErrorWrap error);
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void fail(Error error);
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Stream initStream(
not_null<AVFormatContext *> format,
AVMediaType type);
void seekToPosition(
not_null<AVFormatContext *> format,
const Stream &stream,
crl::time position);
// TODO base::expected.
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[[nodiscard]] auto readPacket()
-> std::variant<FFmpeg::Packet, FFmpeg::AvErrorWrap>;
void processQueuedPackets(SleepPolicy policy);
void handleEndOfFile();
void sendFullInCache(bool force = false);
const not_null<FileDelegate*> _delegate;
const not_null<Reader*> _reader;
base::flat_map<int, std::vector<FFmpeg::Packet>> _queuedPackets;
int _offset = 0;
int _size = 0;
bool _failed = false;
bool _readTillEnd = false;
std::optional<bool> _fullInCache;
crl::semaphore _semaphore;
std::atomic<bool> _interrupted = false;
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FFmpeg::FormatPointer _format;
};
std::optional<Context> _context;
std::shared_ptr<Reader> _reader;
std::thread _thread;
};
} // namespace Streaming
} // namespace Media