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/* 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 2
* 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
* 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, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
#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 {
class BitStream;
class Huffman;
class SeekableReadStream;
namespace Graphics {
struct PixelFormat;
namespace Video {
* Decoder for PSX stream videos.
* This currently implements the most basic PSX stream format that is
* used by most games on the system. Special variants are not supported
* at this time.
* Video decoder used in engines:
* - sword1 (psx)
* - sword2 (psx)
class PSXStreamDecoder : public VideoDecoder {
// 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();
bool isVideoLoaded() const { return _stream != 0; }
uint16 getWidth() const { return _surface->w; }
uint16 getHeight() const { return _surface->h; }
uint32 getFrameCount() const { return _frameCount; }
uint32 getTime() const;
uint32 getTimeToNextFrame() const;
const Graphics::Surface *decodeNextFrame();
Graphics::PixelFormat getPixelFormat() const { return _surface->format; }
bool endOfVideo() const { return _stream->pos() >= _stream->size(); }
// VideoDecoder API
void updateVolume();
void updateBalance();
void initCommon();
Common::SeekableReadStream *_stream;
Graphics::Surface *_surface;
uint32 _frameCount;
Audio::Timestamp _nextFrameStartTime;
Audio::SoundHandle _audHandle;
Audio::QueuingAudioStream *_audStream;
void queueAudioFromSector(Common::SeekableReadStream *sector);
enum PlaneType {
kPlaneY = 0,
kPlaneU = 1,
kPlaneV = 2
uint16 _macroBlocksW, _macroBlocksH;
byte *_yBuffer, *_cbBuffer, *_crBuffer;
void decodeFrame(Common::SeekableReadStream *frame);
void decodeMacroBlock(Common::BitStream *bits, int mbX, int mbY, uint16 scale, uint16 version);
void decodeBlock(Common::BitStream *bits, byte *block, int pitch, uint16 scale, uint16 version, PlaneType plane);
void readAC(Common::BitStream *bits, int *block);
Common::Huffman *_acHuffman;
int readDC(Common::BitStream *bits, uint16 version, PlaneType plane);
Common::Huffman *_dcHuffmanLuma, *_dcHuffmanChroma;
int _lastDC[3];
void dequantizeBlock(int *coefficients, float *block, uint16 scale);
void idct(float *dequantData, float *result);
int readSignedCoefficient(Common::BitStream *bits);
struct ADPCMStatus {
int16 sample[2];
} _adpcmStatus[2];
Common::SeekableReadStream *readSector();
} // End of namespace Video
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