dxa_decoder.h

/* 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 3 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, see <http://www.gnu.org/licenses/>.
 *
 */

#ifndef VIDEO_DXA_DECODER_H
#define VIDEO_DXA_DECODER_H

#include "common/rational.h"
#include "graphics/pixelformat.h"
#include "video/video_decoder.h"

namespace Common {
class SeekableReadStream;
}

namespace Video {

class DXADecoder : public VideoDecoder {
public:
    DXADecoder();
    virtual ~DXADecoder();

    bool loadStream(Common::SeekableReadStream *stream);

protected:
    virtual void readSoundData(Common::SeekableReadStream *stream);

private:
    class DXAVideoTrack : public FixedRateVideoTrack {
    public:
        DXAVideoTrack(Common::SeekableReadStream *stream);
        ~DXAVideoTrack();

        bool isRewindable() const { return true; }
        bool rewind();

        uint16 getWidth() const { return _width; }
        uint16 getHeight() const { return _height; }
        Graphics::PixelFormat getPixelFormat() const;
        int getCurFrame() const { return _curFrame; }
        int getFrameCount() const { return _frameCount; }
        const Graphics::Surface *decodeNextFrame();
        const byte *getPalette() const { _dirtyPalette = false; return _palette; }
        bool hasDirtyPalette() const { return _dirtyPalette; }

        void setFrameStartPos();

    protected:
        Common::Rational getFrameRate() const { return _frameRate; }

    private:
        void decodeZlib(byte *data, int size, int totalSize);
        void decode12(int size);
        void decode13(int size);

        enum ScaleMode {
            S_NONE,
            S_INTERLACED,
            S_DOUBLE
        };

        Common::SeekableReadStream *_fileStream;
        Graphics::Surface *_surface;

        byte *_frameBuffer1;
        byte *_frameBuffer2;
        byte *_scaledBuffer;
        byte *_inBuffer;
        uint32 _inBufferSize;
        byte *_decompBuffer;
        uint32 _decompBufferSize;
        uint16 _curHeight;
        uint32 _frameSize;
        ScaleMode _scaleMode;
        uint16 _width, _height;
        uint32 _frameRate;
        uint32 _frameCount;
        byte _palette[256 * 3];
        mutable bool _dirtyPalette;
        int _curFrame;
        uint32 _frameStartOffset;
    };
};

} // End of namespace Video

#endif