mirror of
https://github.com/libretro/scummvm.git
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134 lines
3.7 KiB
C++
134 lines
3.7 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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* 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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* 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/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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class BitStream;
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class Huffman;
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class SeekableReadStream;
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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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bool isVideoLoaded() const { return _stream != 0; }
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uint16 getWidth() const { return _surface->w; }
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uint16 getHeight() const { return _surface->h; }
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uint32 getFrameCount() const { return _frameCount; }
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uint32 getTime() const;
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uint32 getTimeToNextFrame() const;
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const Graphics::Surface *decodeNextFrame();
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Graphics::PixelFormat getPixelFormat() const { return _surface->format; }
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bool endOfVideo() const { return _stream->pos() >= _stream->size(); }
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protected:
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// VideoDecoder API
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void updateVolume();
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void updateBalance();
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private:
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void initCommon();
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Common::SeekableReadStream *_stream;
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Graphics::Surface *_surface;
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uint32 _frameCount;
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Audio::Timestamp _nextFrameStartTime;
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Audio::SoundHandle _audHandle;
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Audio::QueuingAudioStream *_audStream;
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void queueAudioFromSector(Common::SeekableReadStream *sector);
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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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uint16 _macroBlocksW, _macroBlocksH;
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byte *_yBuffer, *_cbBuffer, *_crBuffer;
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void decodeFrame(Common::SeekableReadStream *frame);
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void decodeMacroBlock(Common::BitStream *bits, int mbX, int mbY, uint16 scale, uint16 version);
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void decodeBlock(Common::BitStream *bits, byte *block, int pitch, uint16 scale, uint16 version, PlaneType plane);
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void readAC(Common::BitStream *bits, int *block);
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Common::Huffman *_acHuffman;
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int readDC(Common::BitStream *bits, uint16 version, PlaneType plane);
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Common::Huffman *_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::BitStream *bits);
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struct ADPCMStatus {
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int16 sample[2];
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} _adpcmStatus[2];
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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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