VIDEO: Add a PlayStation stream decoder

To be used for sword1/sword2 PSX video playback

1 files changed, 120 insertions, 0 deletions

diff --git a/video/psx_decoder.h b/video/psx_decoder.h
new file mode 100644
index 0000000000..e8de507589
--- /dev/null
+++ b/video/psx_decoder.h
@@ -0,0 +1,120 @@
+/* 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.
+ *
+ * Video decoder used in engines:
+ *  - sword1 (psx)
+ *  - sword2 (psx)
+ */
+class PSXStreamDecoder : public FixedRateVideoDecoder {
+public:
+	// CD speed in sectors/second
+	// Calling code should use these enum values instead of the constants
+	enum CDSpeed {
+		kCDUnk = 0,
+		kCD1x = 75,
+		kCD2x = 150
+	};
+
+	PSXStreamDecoder(Common::Rational frameRate);
+	PSXStreamDecoder(CDSpeed speed, uint32 frameCount);
+	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 getElapsedTime() const;
+	const Graphics::Surface *decodeNextFrame();
+	Graphics::PixelFormat getPixelFormat() const { return _surface->format; }
+	bool endOfVideo() const { return _stream->pos() >= _stream->size(); }
+
+protected:
+	// Hardcoded frame rate
+	Common::Rational getFrameRate() const { return _frameRate; }
+
+private:
+	void initCommon();
+	Common::SeekableReadStream *_stream;
+	Graphics::Surface *_surface;
+
+	CDSpeed _speed;
+	uint32 _frameCount;
+	Common::Rational _frameRate;
+
+	Audio::SoundHandle _audHandle;
+	Audio::QueuingAudioStream *_audStream;
+	void queueAudioFromSector(Common::SeekableReadStream *sector);
+
+	Common::Huffman *_huffman;
+	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);
+
+	void dequantizeBlock(int *coefficients, float *block, uint16 scale);
+	void readAC(Common::BitStream *bits, int *block);
+	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
+
+#endif