aboutsummaryrefslogtreecommitdiff
path: root/video/psx_decoder.h
blob: 2a9dedf77f797e40d3788ec6a26e6fef14d68322 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
/* 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
 * 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, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 *
 */

#ifndef VIDEO_PSX_DECODER_H
#define VIDEO_PSX_DECODER_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 {
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 AdvancedVideoDecoder {
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 _surface->w; }
		uint16 getHeight() const { return _surface->h; }
		Graphics::PixelFormat getPixelFormat() const { return _surface->format; }
		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::SeekableReadStream *frame, uint sectorCount);

	private:
		Graphics::Surface *_surface;
		uint32 _frameCount;
		Audio::Timestamp _nextFrameStartTime;
		bool _endOfTrack;
		int _curFrame;

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

		uint16 _macroBlocksW, _macroBlocksH;
		byte *_yBuffer, *_cbBuffer, *_crBuffer;
		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);
	};

	class PSXAudioTrack : public AudioTrack {
	public:
		PSXAudioTrack(Common::SeekableReadStream *sector);
		~PSXAudioTrack();

		bool endOfTrack() const;

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

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

		Audio::QueuingAudioStream *_audStream;

		struct ADPCMStatus {
			int16 sample[2];
		} _adpcmStatus[2];

		bool _endOfTrack;
	};

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

	Common::SeekableReadStream *readSector();
};

} // End of namespace Video

#endif