tdesktop/Telegram/SourceFiles/media/clip/media_clip_implementation.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
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#include <QtCore/QBuffer>
#include <QtCore/QFile>
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namespace Core {
class FileLocation;
} // namespace Core
namespace Media {
namespace Clip {
namespace internal {
class ReaderImplementation {
public:
ReaderImplementation(Core::FileLocation *location, QByteArray *data)
: _location(location)
, _data(data) {
}
enum class Mode {
Silent,
Inspecting, // Not playing video, but reading data.
};
enum class ReadResult {
Success,
Error,
EndOfFile,
};
// Read frames till current frame will have presentation time > frameMs, systemMs = crl::now().
virtual ReadResult readFramesTill(crl::time frameMs, crl::time systemMs) = 0;
// Get current frame real and presentation time.
virtual crl::time frameRealTime() const = 0;
virtual crl::time framePresentationTime() const = 0;
// Render current frame to an image with specific size.
virtual bool renderFrame(QImage &to, bool &hasAlpha, const QSize &size) = 0;
virtual crl::time durationMs() const = 0;
virtual bool start(Mode mode, crl::time &positionMs) = 0;
virtual ~ReaderImplementation() {
}
int64 dataSize() const {
return _dataSize;
}
protected:
Core::FileLocation *_location = nullptr;
QByteArray *_data = nullptr;
QFile _file;
QBuffer _buffer;
QIODevice *_device = nullptr;
int64 _dataSize = 0;
void initDevice();
};
} // namespace internal
} // namespace Clip
} // namespace Media