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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.
162 lines
4.4 KiB
C++
162 lines
4.4 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 VIDEO_PSX_DECODER_H
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#define VIDEO_PSX_DECODER_H
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#include "common/bitstream.h"
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#include "common/endian.h"
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#include "common/rational.h"
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#include "common/rect.h"
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#include "common/str.h"
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#include "graphics/surface.h"
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#include "video/video_decoder.h"
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namespace Audio {
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class QueuingAudioStream;
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}
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namespace Common {
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template <class BITSTREAM>
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class Huffman;
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}
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namespace Graphics {
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struct PixelFormat;
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}
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namespace Video {
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/**
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* Decoder for PSX stream videos.
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* This currently implements the most basic PSX stream format that is
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* used by most games on the system. Special variants are not supported
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* at this time.
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*
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* Video decoder used in engines:
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* - sword1 (psx)
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* - sword2 (psx)
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*/
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class PSXStreamDecoder : public VideoDecoder {
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public:
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// CD speed in sectors/second
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// Calling code should use these enum values instead of the constants
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enum CDSpeed {
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kCD1x = 75,
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kCD2x = 150
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};
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PSXStreamDecoder(CDSpeed speed, uint32 frameCount = 0);
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virtual ~PSXStreamDecoder();
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bool loadStream(Common::SeekableReadStream *stream);
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void close();
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protected:
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void readNextPacket();
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bool useAudioSync() const;
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private:
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class PSXVideoTrack : public VideoTrack {
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public:
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PSXVideoTrack(Common::SeekableReadStream *firstSector, CDSpeed speed, int frameCount);
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~PSXVideoTrack();
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uint16 getWidth() const { return _surface->w; }
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uint16 getHeight() const { return _surface->h; }
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Graphics::PixelFormat getPixelFormat() const { return _surface->format; }
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bool endOfTrack() const { return _endOfTrack; }
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int getCurFrame() const { return _curFrame; }
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int getFrameCount() const { return _frameCount; }
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uint32 getNextFrameStartTime() const;
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const Graphics::Surface *decodeNextFrame();
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void setEndOfTrack() { _endOfTrack = true; }
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void decodeFrame(Common::BitStreamMemoryStream *frame, uint sectorCount);
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private:
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Graphics::Surface *_surface;
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uint32 _frameCount;
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Audio::Timestamp _nextFrameStartTime;
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bool _endOfTrack;
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int _curFrame;
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enum PlaneType {
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kPlaneY = 0,
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kPlaneU = 1,
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kPlaneV = 2
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};
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typedef Common::Huffman<Common::BitStreamMemory16LEMSB> HuffmanDecoder;
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uint16 _macroBlocksW, _macroBlocksH;
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byte *_yBuffer, *_cbBuffer, *_crBuffer;
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void decodeMacroBlock(Common::BitStreamMemory16LEMSB *bits, int mbX, int mbY, uint16 scale, uint16 version);
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void decodeBlock(Common::BitStreamMemory16LEMSB *bits, byte *block, int pitch, uint16 scale, uint16 version, PlaneType plane);
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void readAC(Common::BitStreamMemory16LEMSB *bits, int *block);
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HuffmanDecoder *_acHuffman;
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int readDC(Common::BitStreamMemory16LEMSB *bits, uint16 version, PlaneType plane);
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HuffmanDecoder *_dcHuffmanLuma, *_dcHuffmanChroma;
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int _lastDC[3];
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void dequantizeBlock(int *coefficients, float *block, uint16 scale);
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void idct(float *dequantData, float *result);
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int readSignedCoefficient(Common::BitStreamMemory16LEMSB *bits);
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};
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class PSXAudioTrack : public AudioTrack {
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public:
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PSXAudioTrack(Common::SeekableReadStream *sector, Audio::Mixer::SoundType soundType);
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~PSXAudioTrack();
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bool endOfTrack() const;
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void setEndOfTrack() { _endOfTrack = true; }
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void queueAudioFromSector(Common::SeekableReadStream *sector);
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private:
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Audio::AudioStream *getAudioStream() const;
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Audio::QueuingAudioStream *_audStream;
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struct ADPCMStatus {
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int16 sample[2];
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} _adpcmStatus[2];
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bool _endOfTrack;
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};
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CDSpeed _speed;
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uint32 _frameCount;
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Common::SeekableReadStream *_stream;
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PSXVideoTrack *_videoTrack;
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PSXAudioTrack *_audioTrack;
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Common::SeekableReadStream *readSector();
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};
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} // End of namespace Video
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#endif
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