tdesktop/Telegram/SourceFiles/media/media_clip_implementation.h

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/*
This file is part of Telegram Desktop,
the official desktop version of Telegram messaging app, see https://telegram.org
Telegram Desktop is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
It is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
In addition, as a special exception, the copyright holders give permission
to link the code of portions of this program with the OpenSSL library.
Full license: https://github.com/telegramdesktop/tdesktop/blob/master/LICENSE
Copyright (c) 2014-2017 John Preston, https://desktop.telegram.org
*/
#pragma once
class FileLocation;
namespace Media {
namespace Clip {
namespace internal {
class ReaderImplementation {
public:
ReaderImplementation(FileLocation *location, QByteArray *data)
: _location(location)
, _data(data) {
}
enum class Mode {
Silent,
Normal,
Inspecting, // Not playing video, but reading data.
};
enum class ReadResult {
Success,
Error,
EndOfFile,
};
// Read frames till current frame will have presentation time > frameMs, systemMs = getms().
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virtual ReadResult readFramesTill(TimeMs frameMs, TimeMs systemMs) = 0;
// Get current frame real and presentation time.
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virtual TimeMs frameRealTime() const = 0;
virtual TimeMs framePresentationTime() const = 0;
// Render current frame to an image with specific size.
virtual bool renderFrame(QImage &to, bool &hasAlpha, const QSize &size) = 0;
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virtual TimeMs durationMs() const = 0;
virtual bool hasAudio() const = 0;
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virtual bool start(Mode mode, TimeMs &positionMs) = 0;
virtual ~ReaderImplementation() {
}
int64 dataSize() const {
return _dataSize;
}
protected:
FileLocation *_location;
QByteArray *_data;
QFile _file;
QBuffer _buffer;
QIODevice *_device = nullptr;
int64 _dataSize = 0;
void initDevice();
};
} // namespace internal
} // namespace Clip
} // namespace Media