aboutsummaryrefslogtreecommitdiff
path: root/engines/zvision/video/rlf_decoder.cpp
blob: b798093869aca15d7cbf3d453c6be5869d8a55d8 (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
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
/* 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.
*
*/

#include "common/scummsys.h"

#include "zvision/video/rlf_decoder.h"

#include "common/str.h"
#include "common/file.h"
#include "common/textconsole.h"
#include "common/debug.h"
#include "common/endian.h"

namespace ZVision {

RLFDecoder::~RLFDecoder() {
	close();
}

bool RLFDecoder::loadStream(Common::SeekableReadStream *stream) {
	close();

	addTrack(new RLFVideoTrack(stream));

	return true;
}

RLFDecoder::RLFVideoTrack::RLFVideoTrack(Common::SeekableReadStream *stream)
	: _readStream(stream),
	  _lastFrameRead(0),
	  _frameCount(0),
	  _width(0),
	  _height(0),
	  _frameTime(0),
	  _frames(0),
	  _curFrame(0),
	  _frameBufferByteSize(0) {

	if (!readHeader()) {
		warning("Not a RLF animation file. Wrong magic number");
		return;
	}

	_currentFrameBuffer.create(_width, _height, Graphics::PixelFormat(2, 5, 6, 5, 0, 11, 5, 0, 0));
	_frameBufferByteSize = _width * _height * sizeof(uint16);

	_frames = new Frame[_frameCount];

	// Read in each frame
	for (uint i = 0; i < _frameCount; ++i) {
		_frames[i] = readNextFrame();
	}
}

RLFDecoder::RLFVideoTrack::~RLFVideoTrack() {
	for (uint i = 0; i < _frameCount; ++i) {
		delete[] _frames[i].encodedData;
	}
	delete[] _frames;
	delete _readStream;
	_currentFrameBuffer.free();
}

bool RLFDecoder::RLFVideoTrack::readHeader() {
	if (_readStream->readUint32BE() != MKTAG('F', 'E', 'L', 'R')) {
		return false;
	}

	// Read the header
	_readStream->readUint32LE();                // Size1
	_readStream->readUint32LE();                // Unknown1
	_readStream->readUint32LE();                // Unknown2
	_frameCount = _readStream->readUint32LE();  // Frame count

	// Since we don't need any of the data, we can just seek right to the
	// entries we need rather than read in all the individual entries.
	_readStream->seek(136, SEEK_CUR);

	//// Read CIN header
	//_readStream->readUint32BE();          // Magic number FNIC
	//_readStream->readUint32LE();          // Size2
	//_readStream->readUint32LE();          // Unknown3
	//_readStream->readUint32LE();          // Unknown4
	//_readStream->readUint32LE();          // Unknown5
	//_readStream->seek(0x18, SEEK_CUR);    // VRLE
	//_readStream->readUint32LE();          // LRVD
	//_readStream->readUint32LE();          // Unknown6
	//_readStream->seek(0x18, SEEK_CUR);    // HRLE
	//_readStream->readUint32LE();          // ELHD
	//_readStream->readUint32LE();          // Unknown7
	//_readStream->seek(0x18, SEEK_CUR);    // HKEY
	//_readStream->readUint32LE();          // ELRH

	//// Read MIN info header
	//_readStream->readUint32BE();          // Magic number FNIM
	//_readStream->readUint32LE();          // Size3
	//_readStream->readUint32LE();          // OEDV
	//_readStream->readUint32LE();          // Unknown8
	//_readStream->readUint32LE();          // Unknown9
	//_readStream->readUint32LE();          // Unknown10
	_width = _readStream->readUint32LE();   // Width
	_height = _readStream->readUint32LE();  // Height

	// Read time header
	_readStream->readUint32BE();                    // Magic number EMIT
	_readStream->readUint32LE();                    // Size4
	_readStream->readUint32LE();                    // Unknown11
	_frameTime = _readStream->readUint32LE() / 10;  // Frame time in microseconds

	return true;
}

RLFDecoder::RLFVideoTrack::Frame RLFDecoder::RLFVideoTrack::readNextFrame() {
	RLFDecoder::RLFVideoTrack::Frame frame;

	_readStream->readUint32BE();                        // Magic number MARF
	uint32 size = _readStream->readUint32LE();          // Size
	_readStream->readUint32LE();                        // Unknown1
	_readStream->readUint32LE();                        // Unknown2
	uint32 type = _readStream->readUint32BE();          // Either ELHD or ELRH
	uint32 headerSize = _readStream->readUint32LE();    // Offset from the beginning of this frame to the frame data. Should always be 28
	_readStream->readUint32LE();                        // Unknown3

	frame.encodedSize = size - headerSize;
	frame.encodedData = new int8[frame.encodedSize];
	_readStream->read(frame.encodedData, frame.encodedSize);

	if (type == MKTAG('E', 'L', 'H', 'D')) {
		frame.type = Masked;
	} else if (type == MKTAG('E', 'L', 'R', 'H')) {
		frame.type = Simple;
		_completeFrames.push_back(_lastFrameRead);
	} else {
		warning("Frame %u doesn't have type that can be decoded", _lastFrameRead);
	}

	_lastFrameRead++;
	return frame;
}

bool RLFDecoder::RLFVideoTrack::seek(const Audio::Timestamp &time) {
	uint frame = getFrameAtTime(time);
	assert(frame < (int)_frameCount);

	if ((uint)_curFrame == frame)
		return true;

	if (frame < 0) {
		_curFrame = 0;
		return false;
	}

	int closestFrame = _curFrame;
	int distance = (int)frame - _curFrame;

	if (distance < 0) {
		for (uint i = 0; i < _completeFrames.size(); ++i) {
			if ((int)_completeFrames[i] > frame)
				break;
			closestFrame = _completeFrames[i];
		}
	} else {
		for (uint i = 0; i < _completeFrames.size(); ++i) {
			int newDistance = (int)frame - (int)(_completeFrames[i]);
			if (newDistance < 0)
				break;
			if (newDistance < distance) {
				closestFrame = _completeFrames[i];
				distance = newDistance;
			}
		}
	}

	for (uint i = closestFrame; i < frame; ++i) {
		applyFrameToCurrent(i);
	}

	_curFrame = frame;

	return true;
}

const Graphics::Surface *RLFDecoder::RLFVideoTrack::decodeNextFrame() {
	// When an animation ends, rewind
	if (_curFrame == (int)_frameCount)
		seek(Audio::Timestamp(0, getFrameRate().toInt()));
	
	applyFrameToCurrent(_curFrame);

	_curFrame++;
	return &_currentFrameBuffer;
}

void RLFDecoder::RLFVideoTrack::applyFrameToCurrent(uint frameNumber) {
	if (_frames[frameNumber].type == Masked) {
		decodeMaskedRunLengthEncoding(_frames[frameNumber].encodedData, (int8 *)_currentFrameBuffer.getPixels(), _frames[frameNumber].encodedSize, _frameBufferByteSize);
	} else if (_frames[frameNumber].type == Simple) {
		decodeSimpleRunLengthEncoding(_frames[frameNumber].encodedData, (int8 *)_currentFrameBuffer.getPixels(), _frames[frameNumber].encodedSize, _frameBufferByteSize);
	}
}

void RLFDecoder::RLFVideoTrack::decodeMaskedRunLengthEncoding(int8 *source, int8 *dest, uint32 sourceSize, uint32 destSize) const {
	uint32 sourceOffset = 0;
	uint32 destOffset = 0;
	int16 numberOfCopy = 0;

	while (sourceOffset < sourceSize) {
		int8 numberOfSamples = source[sourceOffset];
		sourceOffset++;

		// If numberOfSamples is negative, the next abs(numberOfSamples) samples should
		// be copied directly from source to dest
		if (numberOfSamples < 0) {
			numberOfCopy = -numberOfSamples;

			while (numberOfCopy > 0) {
				if (sourceOffset + 1 >= sourceSize) {
					return;
				} else if (destOffset + 1 >= destSize) {
					debug(2, "Frame decoding overflow\n\tsourceOffset=%u\tsourceSize=%u\n\tdestOffset=%u\tdestSize=%u", sourceOffset, sourceSize, destOffset, destSize);
					return;
				}

				byte r, g, b;
				// NOTE: Color masks can't be used here, since accurate colors
				// are required to handle transparency correctly
				Graphics::PixelFormat(2, 5, 5, 5, 0, 10, 5, 0, 0).colorToRGB(READ_LE_UINT16(source + sourceOffset), r, g, b);
				uint16 destColor = Graphics::PixelFormat(2, 5, 6, 5, 0, 11, 5, 0, 0).RGBToColor(r, g, b);
				WRITE_UINT16(dest + destOffset, destColor);

				sourceOffset += 2;
				destOffset += 2;
				numberOfCopy--;
			}

			// If numberOfSamples is >= 0, move destOffset forward ((numberOfSamples * 2) + 2)
			// This function assumes the dest buffer has been memset with 0's.
		} else {
			if (sourceOffset + 1 >= sourceSize) {
				return;
			} else if (destOffset + 1 >= destSize) {
				debug(2, "Frame decoding overflow\n\tsourceOffset=%u\tsourceSize=%u\n\tdestOffset=%u\tdestSize=%u", sourceOffset, sourceSize, destOffset, destSize);
				return;
			}

			destOffset += (numberOfSamples * 2) + 2;
		}
	}
}

void RLFDecoder::RLFVideoTrack::decodeSimpleRunLengthEncoding(int8 *source, int8 *dest, uint32 sourceSize, uint32 destSize) const {
	uint32 sourceOffset = 0;
	uint32 destOffset = 0;
	int16 numberOfCopy = 0;

	while (sourceOffset < sourceSize) {
		int8 numberOfSamples = source[sourceOffset];
		sourceOffset++;

		// If numberOfSamples is negative, the next abs(numberOfSamples) samples should
		// be copied directly from source to dest
		if (numberOfSamples < 0) {
			numberOfCopy = -numberOfSamples;

			while (numberOfCopy > 0) {
				if (sourceOffset + 1 >= sourceSize) {
					return;
				} else if (destOffset + 1 >= destSize) {
					debug(2, "Frame decoding overflow\n\tsourceOffset=%u\tsourceSize=%u\n\tdestOffset=%u\tdestSize=%u", sourceOffset, sourceSize, destOffset, destSize);
					return;
				}

				byte r, g, b;
				// NOTE: Color masks can't be used here, since accurate colors
				// are required to handle transparency correctly
				Graphics::PixelFormat(2, 5, 5, 5, 0, 10, 5, 0, 0).colorToRGB(READ_LE_UINT16(source + sourceOffset), r, g, b);
				uint16 destColor = Graphics::PixelFormat(2, 5, 6, 5, 0, 11, 5, 0, 0).RGBToColor(r, g, b);
				WRITE_UINT16(dest + destOffset, destColor);

				sourceOffset += 2;
				destOffset += 2;
				numberOfCopy--;
			}

			// If numberOfSamples is >= 0, copy one sample from source to the
			// next (numberOfSamples + 2) dest spots
		} else {
			if (sourceOffset + 1 >= sourceSize) {
				return;
			}

			byte r, g, b;
			// NOTE: Color masks can't be used here, since accurate colors
			// are required to handle transparency correctly
			Graphics::PixelFormat(2, 5, 5, 5, 0, 10, 5, 0, 0).colorToRGB(READ_LE_UINT16(source + sourceOffset), r, g, b);
			uint16 sampleColor = Graphics::PixelFormat(2, 5, 6, 5, 0, 11, 5, 0, 0).RGBToColor(r, g, b);
			sourceOffset += 2;

			numberOfCopy = numberOfSamples + 2;
			while (numberOfCopy > 0) {
				if (destOffset + 1 >= destSize) {
					debug(2, "Frame decoding overflow\n\tsourceOffset=%u\tsourceSize=%u\n\tdestOffset=%u\tdestSize=%u", sourceOffset, sourceSize, destOffset, destSize);
					return;
				}

				WRITE_UINT16(dest + destOffset, sampleColor);
				destOffset += 2;
				numberOfCopy--;
			}
		}
	}
}

} // End of namespace ZVision