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/* ScummVM - Graphic Adventure Engine
*
* ScummVM is the legal property of its developers, whose names
* are too numerous to list here. Please refer to the COPYRIGHT
* file distributed with this source distribution.
*
* This program 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 2
* of the License, or (at your option) any later version.
*
* This program 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.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
*/
#ifndef ZVISION_RLF_DECODER_H
#define ZVISION_RLF_DECODER_H
#include "common/file.h"
#include "video/video_decoder.h"
#include "graphics/surface.h"
namespace ZVision {
class RLFDecoder : public Video::VideoDecoder {
public:
RLFDecoder() {}
~RLFDecoder();
bool loadStream(Common::SeekableReadStream *stream);
private:
class RLFVideoTrack : public FixedRateVideoTrack {
public:
RLFVideoTrack(Common::SeekableReadStream *stream);
~RLFVideoTrack();
uint16 getWidth() const { return _width; }
uint16 getHeight() const { return _height; }
Graphics::PixelFormat getPixelFormat() const { return Graphics::PixelFormat(2, 5, 5, 5, 0, 10, 5, 0, 0); /* RGB 555 */ }
int getCurFrame() const { return _displayedFrame; }
int getFrameCount() const { return _frameCount; }
const Graphics::Surface *decodeNextFrame();
bool isSeekable() const { return true; }
bool seek(const Audio::Timestamp &time);
protected:
Common::Rational getFrameRate() const { return Common::Rational(1000, _frameTime); }
private:
enum EncodingType {
Masked,
Simple
};
struct Frame {
EncodingType type;
int8 *encodedData;
uint32 encodedSize;
};
/**
* Reads in the header of the RLF file
*
* @return Will return false if the header magic number is wrong
*/
bool readHeader();
/**
* Reads the next frame from the RLF file, stores the data in
* a Frame object, then returns the object
*
* @return A Frame object representing the frame data
*/
Frame readNextFrame();
/**
* Applies the frame corresponding to frameNumber on top of _currentFrameBuffer.
* This function requires _stream = false so it can look up the Frame object
* referenced by frameNumber.
*
* @param frameNumber The frame number to apply to _currentFrameBuffer
*/
void applyFrameToCurrent(uint frameNumber);
/**
* Decode frame data that uses masked run length encoding. This is the encoding
* used by P-frames.
*
* @param source The source pixel data
* @param dest The destination buffer
* @param sourceSize The size of the source pixel data
* @param destSize The size of the destination buffer
*/
void decodeMaskedRunLengthEncoding(int8 *source, int8 *dest, uint32 sourceSize, uint32 destSize) const;
/**
* Decode frame data that uses simple run length encoding. This is the encoding
* used by I-frames.
*
* @param source The source pixel data
* @param dest The destination buffer
* @param sourceSize The size of the source pixel data
* @param destSize The size of the destination buffer
*/
void decodeSimpleRunLengthEncoding(int8 *source, int8 *dest, uint32 sourceSize, uint32 destSize) const;
uint _lastFrameRead;
uint _frameCount;
uint _width;
uint _height;
uint32 _frameTime; // In milliseconds
Frame *_frames;
Common::Array<uint> _completeFrames;
int _displayedFrame;
Graphics::Surface _currentFrameBuffer;
uint32 _frameBufferByteSize;
Common::SeekableReadStream *_readStream;
}; // RLFVideoTrack
};
} // End of namespace ZVision
#endif
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