psx_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_PSX_DECODER_H
#define VIDEO_PSX_DECODER_H

#include "common/bitstream.h"
#include "common/endian.h"
#include "common/rational.h"
#include "common/rect.h"
#include "common/str.h"
#include "graphics/surface.h"
#include "video/video_decoder.h"

namespace Audio {
class QueuingAudioStream;
}

namespace Common {
template <class BITSTREAM>
class Huffman;
}

namespace Graphics {
struct PixelFormat;
}

namespace Video {

class PSXStreamDecoder : public VideoDecoder {
public:
    // CD speed in sectors/second
    // Calling code should use these enum values instead of the constants
    enum CDSpeed {
        kCD1x = 75,
        kCD2x = 150
    };

    PSXStreamDecoder(CDSpeed speed, uint32 frameCount = 0);
    virtual ~PSXStreamDecoder();

    bool loadStream(Common::SeekableReadStream *stream);
    void close();

protected:
    void readNextPacket();
    bool useAudioSync() const;

private:
    class PSXVideoTrack : public VideoTrack {
    public:
        PSXVideoTrack(Common::SeekableReadStream *firstSector, CDSpeed speed, int frameCount);
        ~PSXVideoTrack();

        uint16 getWidth() const { return _width; }
        uint16 getHeight() const { return _height; }
        Graphics::PixelFormat getPixelFormat() const { return _pixelFormat; }
        bool setOutputPixelFormat(const Graphics::PixelFormat &format) { _pixelFormat = format; return true; }
        bool endOfTrack() const { return _endOfTrack; }
        int getCurFrame() const { return _curFrame; }
        int getFrameCount() const { return _frameCount; }
        uint32 getNextFrameStartTime() const;
        const Graphics::Surface *decodeNextFrame();

        void setEndOfTrack() { _endOfTrack = true; }
        void decodeFrame(Common::BitStreamMemoryStream *frame, uint sectorCount);

    private:
        Graphics::Surface *_surface;
        Graphics::PixelFormat _pixelFormat;
        uint16 _width;
        uint16 _height;
        uint32 _frameCount;
        Audio::Timestamp _nextFrameStartTime;
        bool _endOfTrack;
        int _curFrame;

        enum PlaneType {
            kPlaneY = 0,
            kPlaneU = 1,
            kPlaneV = 2
        };

        typedef Common::Huffman<Common::BitStreamMemory16LEMSB> HuffmanDecoder;

        uint16 _macroBlocksW, _macroBlocksH;
        byte *_yBuffer, *_cbBuffer, *_crBuffer;
        void decodeMacroBlock(Common::BitStreamMemory16LEMSB *bits, int mbX, int mbY, uint16 scale, uint16 version);
        void decodeBlock(Common::BitStreamMemory16LEMSB *bits, byte *block, int pitch, uint16 scale, uint16 version, PlaneType plane);

        void readAC(Common::BitStreamMemory16LEMSB *bits, int *block);
        HuffmanDecoder *_acHuffman;

        int readDC(Common::BitStreamMemory16LEMSB *bits, uint16 version, PlaneType plane);
        HuffmanDecoder *_dcHuffmanLuma, *_dcHuffmanChroma;
        int _lastDC[3];

        void dequantizeBlock(int *coefficients, float *block, uint16 scale);
        void idct(float *dequantData, float *result);
        int readSignedCoefficient(Common::BitStreamMemory16LEMSB *bits);
    };

    class PSXAudioTrack : public AudioTrack {
    public:
        PSXAudioTrack(Common::SeekableReadStream *sector, Audio::Mixer::SoundType soundType);
        ~PSXAudioTrack();

        bool endOfTrack() const;

        void setEndOfTrack() { _endOfTrack = true; }
        void queueAudioFromSector(Common::SeekableReadStream *sector);

    private:
        Audio::AudioStream *getAudioStream() const;

        Audio::QueuingAudioStream *_audStream;

        bool _endOfTrack;
        bool _stereo;
        uint _rate;
    };

    CDSpeed _speed;
    uint32 _frameCount;
    Common::SeekableReadStream *_stream;
    PSXVideoTrack *_videoTrack;
    PSXAudioTrack *_audioTrack;

    Common::SeekableReadStream *readSector();
};

} // End of namespace Video

#endif