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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
+
+#include <QtCore/QBuffer>
+#include <QtCore/QFile>
+
+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,
+		int &index,
+		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