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
334
335
336
337
338
339
340
341
342
|
/* 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/textconsole.h"
#include "common/stream.h"
#include "common/util.h"
#include "audio/decoders/3do.h"
#include "audio/decoders/adpcm_intern.h"
namespace Audio {
// Reuses ADPCM table
#define audio_3DO_ADP4_stepSizeTable Ima_ADPCMStream::_imaTable
#define audio_3DO_ADP4_stepSizeIndex ADPCMStream::_stepAdjustTable
RewindableAudioStream *make3DO_ADP4AudioStream(Common::SeekableReadStream *stream, uint16 sampleRate, bool stereo, uint32 *audioLengthMSecsPtr, DisposeAfterUse::Flag disposeAfterUse, audio_3DO_ADP4_PersistentSpace *persistentSpace) {
if (stereo) {
warning("make3DO_ADP4Stream(): stereo currently not supported");
return 0;
}
if (audioLengthMSecsPtr) {
// Caller requires the milliseconds of audio
uint32 audioLengthMSecs = stream->size() * 2 * 1000 / sampleRate; // 1 byte == 2 16-bit sample
if (stereo) {
audioLengthMSecs /= 2;
}
*audioLengthMSecsPtr = audioLengthMSecs;
}
return new Audio3DO_ADP4_Stream(stream, sampleRate, stereo, disposeAfterUse, persistentSpace);
}
Audio3DO_ADP4_Stream::Audio3DO_ADP4_Stream(Common::SeekableReadStream *stream, uint16 sampleRate, bool stereo, DisposeAfterUse::Flag disposeAfterUse, audio_3DO_ADP4_PersistentSpace *persistentSpace)
: _sampleRate(sampleRate), _stereo(stereo),
_stream(stream, disposeAfterUse) {
_callerDecoderData = persistentSpace;
memset(&_initialDecoderData, 0, sizeof(_initialDecoderData));
_initialRead = true;
reset();
}
void Audio3DO_ADP4_Stream::reset() {
memcpy(&_curDecoderData, &_initialDecoderData, sizeof(_curDecoderData));
_streamBytesLeft = _stream->size();
_stream->seek(0);
}
bool Audio3DO_ADP4_Stream::rewind() {
reset();
return true;
}
int16 Audio3DO_ADP4_Stream::decodeSample(byte compressedNibble) {
int16 currentStep = audio_3DO_ADP4_stepSizeTable[_curDecoderData.stepIndex];
int32 decodedSample = _curDecoderData.lastSample;
int16 delta = currentStep >> 3;
if (compressedNibble & 1)
delta += currentStep >> 2;
if (compressedNibble & 2)
delta += currentStep >> 1;
if (compressedNibble & 4)
delta += currentStep;
if (compressedNibble & 8) {
decodedSample -= delta;
} else {
decodedSample += delta;
}
_curDecoderData.lastSample = CLIP<int32>(decodedSample, -32768, 32767);
_curDecoderData.stepIndex += audio_3DO_ADP4_stepSizeIndex[compressedNibble & 0x07];
_curDecoderData.stepIndex = CLIP<int16>(_curDecoderData.stepIndex, 0, ARRAYSIZE(audio_3DO_ADP4_stepSizeTable) - 1);
return _curDecoderData.lastSample;
}
// Writes the requested amount (or less) of samples into buffer and returns the amount of samples, that got written
int Audio3DO_ADP4_Stream::readBuffer(int16 *buffer, const int numSamples) {
int8 byteCache[AUDIO_3DO_CACHE_SIZE];
int8 *byteCachePtr = NULL;
int byteCacheSize = 0;
int requestedBytesLeft = 0;
int decodedSamplesCount = 0;
int8 compressedByte = 0;
if (endOfData())
return 0; // no more bytes left
if (_callerDecoderData) {
// copy caller decoder data over
memcpy(&_curDecoderData, _callerDecoderData, sizeof(_curDecoderData));
if (_initialRead) {
_initialRead = false;
memcpy(&_initialDecoderData, &_curDecoderData, sizeof(_initialDecoderData));
}
}
requestedBytesLeft = numSamples >> 1; // 1 byte for 2 16-bit sample
if (requestedBytesLeft > _streamBytesLeft)
requestedBytesLeft = _streamBytesLeft; // not enough bytes left
// in case caller requests an uneven amount of samples, we will return an even amount
// buffering, so that direct decoding of files and such runs way faster
while (requestedBytesLeft) {
if (requestedBytesLeft > AUDIO_3DO_CACHE_SIZE) {
byteCacheSize = AUDIO_3DO_CACHE_SIZE;
} else {
byteCacheSize = requestedBytesLeft;
}
requestedBytesLeft -= byteCacheSize;
_streamBytesLeft -= byteCacheSize;
// Fill our byte cache
_stream->read(byteCache, byteCacheSize);
byteCachePtr = byteCache;
// Mono
while (byteCacheSize) {
compressedByte = *byteCachePtr++;
byteCacheSize--;
buffer[decodedSamplesCount] = decodeSample(compressedByte >> 4);
decodedSamplesCount++;
buffer[decodedSamplesCount] = decodeSample(compressedByte & 0x0f);
decodedSamplesCount++;
}
}
if (_callerDecoderData) {
// copy caller decoder data back
memcpy(_callerDecoderData, &_curDecoderData, sizeof(_curDecoderData));
}
return decodedSamplesCount;
}
// ============================================================================
static int16 audio_3DO_SDX2_SquareTable[256] = {
-32768,-32258,-31752,-31250,-30752,-30258,-29768,-29282,-28800,-28322,
-27848,-27378,-26912,-26450,-25992,-25538,-25088,-24642,-24200,-23762,
-23328,-22898,-22472,-22050,-21632,-21218,-20808,-20402,-20000,-19602,
-19208,-18818,-18432,-18050,-17672,-17298,-16928,-16562,-16200,-15842,
-15488,-15138,-14792,-14450,-14112,-13778,-13448,-13122,-12800,-12482,
-12168,-11858,-11552,-11250,-10952,-10658,-10368,-10082, -9800, -9522,
-9248, -8978, -8712, -8450, -8192, -7938, -7688, -7442, -7200, -6962,
-6728, -6498, -6272, -6050, -5832, -5618, -5408, -5202, -5000, -4802,
-4608, -4418, -4232, -4050, -3872, -3698, -3528, -3362, -3200, -3042,
-2888, -2738, -2592, -2450, -2312, -2178, -2048, -1922, -1800, -1682,
-1568, -1458, -1352, -1250, -1152, -1058, -968, -882, -800, -722,
-648, -578, -512, -450, -392, -338, -288, -242, -200, -162,
-128, -98, -72, -50, -32, -18, -8, -2, 0, 2,
8, 18, 32, 50, 72, 98, 128, 162, 200, 242,
288, 338, 392, 450, 512, 578, 648, 722, 800, 882,
968, 1058, 1152, 1250, 1352, 1458, 1568, 1682, 1800, 1922,
2048, 2178, 2312, 2450, 2592, 2738, 2888, 3042, 3200, 3362,
3528, 3698, 3872, 4050, 4232, 4418, 4608, 4802, 5000, 5202,
5408, 5618, 5832, 6050, 6272, 6498, 6728, 6962, 7200, 7442,
7688, 7938, 8192, 8450, 8712, 8978, 9248, 9522, 9800, 10082,
10368, 10658, 10952, 11250, 11552, 11858, 12168, 12482, 12800, 13122,
13448, 13778, 14112, 14450, 14792, 15138, 15488, 15842, 16200, 16562,
16928, 17298, 17672, 18050, 18432, 18818, 19208, 19602, 20000, 20402,
20808, 21218, 21632, 22050, 22472, 22898, 23328, 23762, 24200, 24642,
25088, 25538, 25992, 26450, 26912, 27378, 27848, 28322, 28800, 29282,
29768, 30258, 30752, 31250, 31752, 32258
};
Audio3DO_SDX2_Stream::Audio3DO_SDX2_Stream(Common::SeekableReadStream *stream, uint16 sampleRate, bool stereo, DisposeAfterUse::Flag disposeAfterUse, audio_3DO_SDX2_PersistentSpace *persistentSpace)
: _sampleRate(sampleRate), _stereo(stereo),
_stream(stream, disposeAfterUse) {
_callerDecoderData = persistentSpace;
memset(&_initialDecoderData, 0, sizeof(_initialDecoderData));
_initialRead = true;
reset();
}
void Audio3DO_SDX2_Stream::reset() {
memcpy(&_curDecoderData, &_initialDecoderData, sizeof(_curDecoderData));
_streamBytesLeft = _stream->size();
_stream->seek(0);
}
bool Audio3DO_SDX2_Stream::rewind() {
reset();
return true;
}
// Writes the requested amount (or less) of samples into buffer and returns the amount of samples, that got written
int Audio3DO_SDX2_Stream::readBuffer(int16 *buffer, const int numSamples) {
int8 byteCache[AUDIO_3DO_CACHE_SIZE];
int8 *byteCachePtr = NULL;
int byteCacheSize = 0;
int requestedBytesLeft = numSamples; // 1 byte per 16-bit sample
int decodedSamplesCount = 0;
int8 compressedByte = 0;
uint8 squareTableOffset = 0;
int16 decodedSample = 0;
if (endOfData())
return 0; // no more bytes left
if (_stereo) {
// We expect numSamples to be even in case of Stereo audio
assert((numSamples & 1) == 0);
}
if (_callerDecoderData) {
// copy caller decoder data over
memcpy(&_curDecoderData, _callerDecoderData, sizeof(_curDecoderData));
if (_initialRead) {
_initialRead = false;
memcpy(&_initialDecoderData, &_curDecoderData, sizeof(_initialDecoderData));
}
}
requestedBytesLeft = numSamples;
if (requestedBytesLeft > _streamBytesLeft)
requestedBytesLeft = _streamBytesLeft; // not enough bytes left
// buffering, so that direct decoding of files and such runs way faster
while (requestedBytesLeft) {
if (requestedBytesLeft > AUDIO_3DO_CACHE_SIZE) {
byteCacheSize = AUDIO_3DO_CACHE_SIZE;
} else {
byteCacheSize = requestedBytesLeft;
}
requestedBytesLeft -= byteCacheSize;
_streamBytesLeft -= byteCacheSize;
// Fill our byte cache
_stream->read(byteCache, byteCacheSize);
byteCachePtr = byteCache;
if (!_stereo) {
// Mono
while (byteCacheSize) {
compressedByte = *byteCachePtr++;
byteCacheSize--;
squareTableOffset = compressedByte + 128;
if (!(compressedByte & 1))
_curDecoderData.lastSample1 = 0;
decodedSample = _curDecoderData.lastSample1 + audio_3DO_SDX2_SquareTable[squareTableOffset];
_curDecoderData.lastSample1 = decodedSample;
buffer[decodedSamplesCount] = decodedSample;
decodedSamplesCount++;
}
} else {
// Stereo
while (byteCacheSize) {
compressedByte = *byteCachePtr++;
byteCacheSize--;
squareTableOffset = compressedByte + 128;
if (!(decodedSamplesCount & 1)) {
// First channel
if (!(compressedByte & 1))
_curDecoderData.lastSample1 = 0;
decodedSample = _curDecoderData.lastSample1 + audio_3DO_SDX2_SquareTable[squareTableOffset];
_curDecoderData.lastSample1 = decodedSample;
} else {
// Second channel
if (!(compressedByte & 1))
_curDecoderData.lastSample2 = 0;
decodedSample = _curDecoderData.lastSample2 + audio_3DO_SDX2_SquareTable[squareTableOffset];
_curDecoderData.lastSample2 = decodedSample;
}
buffer[decodedSamplesCount] = decodedSample;
decodedSamplesCount++;
}
}
}
if (_callerDecoderData) {
// copy caller decoder data back
memcpy(_callerDecoderData, &_curDecoderData, sizeof(_curDecoderData));
}
return decodedSamplesCount;
}
RewindableAudioStream *make3DO_SDX2AudioStream(Common::SeekableReadStream *stream, uint16 sampleRate, bool stereo, uint32 *audioLengthMSecsPtr, DisposeAfterUse::Flag disposeAfterUse, audio_3DO_SDX2_PersistentSpace *persistentSpace) {
if (stereo) {
if (stream->size() & 1) {
warning("make3DO_SDX2Stream(): stereo data is uneven size");
return 0;
}
}
if (audioLengthMSecsPtr) {
// Caller requires the milliseconds of audio
uint32 audioLengthMSecs = stream->size() * 1000 / sampleRate; // 1 byte == 1 16-bit sample
if (stereo) {
audioLengthMSecs /= 2;
}
*audioLengthMSecsPtr = audioLengthMSecs;
}
return new Audio3DO_SDX2_Stream(stream, sampleRate, stereo, disposeAfterUse, persistentSpace);
}
} // End of namespace Audio
|