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Symbols for codes shorter than the prefix table index width are stored in the table. All the entries in the table with an index starting with the code are set to the symbol value. That way, when decoding it is possible to get the number of bits corresponding to the table width from the bitstream and directly find the symbol value. Longer code still need to be searched for in the codes list.
91 lines
3.3 KiB
C++
91 lines
3.3 KiB
C++
/* ScummVM - Graphic Adventure Engine
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*
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* ScummVM is the legal property of its developers, whose names
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* are too numerous to list here. Please refer to the COPYRIGHT
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* file distributed with this source distribution.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*
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*/
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#ifndef IMAGE_CODECS_SVQ1_H
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#define IMAGE_CODECS_SVQ1_H
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#include "common/bitstream.h"
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#include "image/codecs/codec.h"
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namespace Common {
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template <class BITSTREAM>
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class Huffman;
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struct Point;
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}
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namespace Image {
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/**
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* Sorenson Vector Quantizer 1 decoder.
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*
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* Used by PICT/QuickTime.
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*/
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class SVQ1Decoder : public Codec {
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public:
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SVQ1Decoder(uint16 width, uint16 height);
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~SVQ1Decoder();
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const Graphics::Surface *decodeFrame(Common::SeekableReadStream &stream);
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Graphics::PixelFormat getPixelFormat() const { return _surface->format; }
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private:
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Graphics::Surface *_surface;
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uint16 _width, _height;
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uint16 _frameWidth, _frameHeight;
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byte *_last[3];
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typedef Common::Huffman<Common::BitStream32BEMSB> HuffmanDecoder;
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HuffmanDecoder *_blockType;
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HuffmanDecoder *_intraMultistage[6];
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HuffmanDecoder *_interMultistage[6];
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HuffmanDecoder *_intraMean;
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HuffmanDecoder *_interMean;
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HuffmanDecoder *_motionComponent;
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bool svq1DecodeBlockIntra(Common::BitStream32BEMSB *s, byte *pixels, int pitch);
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bool svq1DecodeBlockNonIntra(Common::BitStream32BEMSB *s, byte *pixels, int pitch);
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bool svq1DecodeMotionVector(Common::BitStream32BEMSB *s, Common::Point *mv, Common::Point **pmv);
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void svq1SkipBlock(byte *current, byte *previous, int pitch, int x, int y);
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bool svq1MotionInterBlock(Common::BitStream32BEMSB *ss, byte *current, byte *previous, int pitch,
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Common::Point *motion, int x, int y);
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bool svq1MotionInter4vBlock(Common::BitStream32BEMSB *ss, byte *current, byte *previous, int pitch,
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Common::Point *motion, int x, int y);
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bool svq1DecodeDeltaBlock(Common::BitStream32BEMSB *ss, byte *current, byte *previous, int pitch,
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Common::Point *motion, int x, int y);
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void putPixels8C(byte *block, const byte *pixels, int lineSize, int h);
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void putPixels8L2(byte *dst, const byte *src1, const byte *src2, int dstStride, int srcStride1, int srcStride2, int h);
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void putPixels8X2C(byte *block, const byte *pixels, int lineSize, int h);
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void putPixels8Y2C(byte *block, const byte *pixels, int lineSize, int h);
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void putPixels8XY2C(byte *block, const byte *pixels, int lineSize, int h);
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void putPixels16C(byte *block, const byte *pixels, int lineSize, int h);
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void putPixels16X2C(byte *block, const byte *pixels, int lineSize, int h);
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void putPixels16Y2C(byte *block, const byte *pixels, int lineSize, int h);
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void putPixels16XY2C(byte *block, const byte *pixels, int lineSize, int h);
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};
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} // End of namespace Image
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#endif
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