/[svn]/libgig/trunk/src/gig.cpp
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Contents of /libgig/trunk/src/gig.cpp

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Revision 347 - (show annotations) (download)
Sun Jan 23 20:47:18 2005 UTC (14 years, 4 months ago) by schoenebeck
File size: 72211 byte(s)
* src/gig.h, src/gig.cpp: support for up to 8 dimensions as introduced by
  Gig V3 (patch by Andreas Persson)

1 /***************************************************************************
2 * *
3 * libgig - C++ cross-platform Gigasampler format file loader library *
4 * *
5 * Copyright (C) 2003, 2004 by Christian Schoenebeck *
6 * <cuse@users.sourceforge.net> *
7 * *
8 * This library is free software; you can redistribute it and/or modify *
9 * it under the terms of the GNU General Public License as published by *
10 * the Free Software Foundation; either version 2 of the License, or *
11 * (at your option) any later version. *
12 * *
13 * This library is distributed in the hope that it will be useful, *
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of *
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
16 * GNU General Public License for more details. *
17 * *
18 * You should have received a copy of the GNU General Public License *
19 * along with this library; if not, write to the Free Software *
20 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, *
21 * MA 02111-1307 USA *
22 ***************************************************************************/
23
24 #include "gig.h"
25
26 namespace gig {
27
28 // *************** Sample ***************
29 // *
30
31 unsigned int Sample::Instances = 0;
32 void* Sample::pDecompressionBuffer = NULL;
33 unsigned long Sample::DecompressionBufferSize = 0;
34
35 Sample::Sample(File* pFile, RIFF::List* waveList, unsigned long WavePoolOffset) : DLS::Sample((DLS::File*) pFile, waveList, WavePoolOffset) {
36 Instances++;
37
38 RIFF::Chunk* _3gix = waveList->GetSubChunk(CHUNK_ID_3GIX);
39 if (!_3gix) throw gig::Exception("Mandatory chunks in <wave> list chunk not found.");
40 SampleGroup = _3gix->ReadInt16();
41
42 RIFF::Chunk* smpl = waveList->GetSubChunk(CHUNK_ID_SMPL);
43 if (!smpl) throw gig::Exception("Mandatory chunks in <wave> list chunk not found.");
44 Manufacturer = smpl->ReadInt32();
45 Product = smpl->ReadInt32();
46 SamplePeriod = smpl->ReadInt32();
47 MIDIUnityNote = smpl->ReadInt32();
48 FineTune = smpl->ReadInt32();
49 smpl->Read(&SMPTEFormat, 1, 4);
50 SMPTEOffset = smpl->ReadInt32();
51 Loops = smpl->ReadInt32();
52 uint32_t manufByt = smpl->ReadInt32();
53 LoopID = smpl->ReadInt32();
54 smpl->Read(&LoopType, 1, 4);
55 LoopStart = smpl->ReadInt32();
56 LoopEnd = smpl->ReadInt32();
57 LoopFraction = smpl->ReadInt32();
58 LoopPlayCount = smpl->ReadInt32();
59
60 FrameTable = NULL;
61 SamplePos = 0;
62 RAMCache.Size = 0;
63 RAMCache.pStart = NULL;
64 RAMCache.NullExtensionSize = 0;
65
66 Compressed = (waveList->GetSubChunk(CHUNK_ID_EWAV));
67 if (Compressed) {
68 ScanCompressedSample();
69 }
70
71 if (BitDepth > 24) throw gig::Exception("Only samples up to 24 bit supported");
72 if (Compressed && Channels == 1) throw gig::Exception("Mono compressed samples not yet supported");
73 if (Compressed && BitDepth == 24) throw gig::Exception("24 bit compressed samples not yet supported");
74
75 // we use a buffer for decompression and for truncating 24 bit samples to 16 bit
76 if ((Compressed || BitDepth == 24) && !pDecompressionBuffer) {
77 pDecompressionBuffer = new int8_t[INITIAL_SAMPLE_BUFFER_SIZE];
78 DecompressionBufferSize = INITIAL_SAMPLE_BUFFER_SIZE;
79 }
80 FrameOffset = 0; // just for streaming compressed samples
81
82 LoopSize = LoopEnd - LoopStart;
83 }
84
85 /// Scans compressed samples for mandatory informations (e.g. actual number of total sample points).
86 void Sample::ScanCompressedSample() {
87 //TODO: we have to add some more scans here (e.g. determine compression rate)
88 this->SamplesTotal = 0;
89 std::list<unsigned long> frameOffsets;
90
91 // Scanning
92 pCkData->SetPos(0);
93 while (pCkData->GetState() == RIFF::stream_ready) {
94 frameOffsets.push_back(pCkData->GetPos());
95 int16_t compressionmode = pCkData->ReadInt16();
96 this->SamplesTotal += 2048;
97 switch (compressionmode) {
98 case 1: // left channel compressed
99 case 256: // right channel compressed
100 pCkData->SetPos(6148, RIFF::stream_curpos);
101 break;
102 case 257: // both channels compressed
103 pCkData->SetPos(4104, RIFF::stream_curpos);
104 break;
105 default: // both channels uncompressed
106 pCkData->SetPos(8192, RIFF::stream_curpos);
107 }
108 }
109 pCkData->SetPos(0);
110
111 //FIXME: only seen compressed samples with 16 bit stereo so far
112 this->FrameSize = 4;
113 this->BitDepth = 16;
114
115 // Build the frames table (which is used for fast resolving of a frame's chunk offset)
116 if (FrameTable) delete[] FrameTable;
117 FrameTable = new unsigned long[frameOffsets.size()];
118 std::list<unsigned long>::iterator end = frameOffsets.end();
119 std::list<unsigned long>::iterator iter = frameOffsets.begin();
120 for (int i = 0; iter != end; i++, iter++) {
121 FrameTable[i] = *iter;
122 }
123 }
124
125 /**
126 * Loads (and uncompresses if needed) the whole sample wave into RAM. Use
127 * ReleaseSampleData() to free the memory if you don't need the cached
128 * sample data anymore.
129 *
130 * @returns buffer_t structure with start address and size of the buffer
131 * in bytes
132 * @see ReleaseSampleData(), Read(), SetPos()
133 */
134 buffer_t Sample::LoadSampleData() {
135 return LoadSampleDataWithNullSamplesExtension(this->SamplesTotal, 0); // 0 amount of NullSamples
136 }
137
138 /**
139 * Reads (uncompresses if needed) and caches the first \a SampleCount
140 * numbers of SamplePoints in RAM. Use ReleaseSampleData() to free the
141 * memory space if you don't need the cached samples anymore. There is no
142 * guarantee that exactly \a SampleCount samples will be cached; this is
143 * not an error. The size will be eventually truncated e.g. to the
144 * beginning of a frame of a compressed sample. This is done for
145 * efficiency reasons while streaming the wave by your sampler engine
146 * later. Read the <i>Size</i> member of the <i>buffer_t</i> structure
147 * that will be returned to determine the actual cached samples, but note
148 * that the size is given in bytes! You get the number of actually cached
149 * samples by dividing it by the frame size of the sample:
150 *
151 * buffer_t buf = pSample->LoadSampleData(acquired_samples);
152 * long cachedsamples = buf.Size / pSample->FrameSize;
153 *
154 * @param SampleCount - number of sample points to load into RAM
155 * @returns buffer_t structure with start address and size of
156 * the cached sample data in bytes
157 * @see ReleaseSampleData(), Read(), SetPos()
158 */
159 buffer_t Sample::LoadSampleData(unsigned long SampleCount) {
160 return LoadSampleDataWithNullSamplesExtension(SampleCount, 0); // 0 amount of NullSamples
161 }
162
163 /**
164 * Loads (and uncompresses if needed) the whole sample wave into RAM. Use
165 * ReleaseSampleData() to free the memory if you don't need the cached
166 * sample data anymore.
167 * The method will add \a NullSamplesCount silence samples past the
168 * official buffer end (this won't affect the 'Size' member of the
169 * buffer_t structure, that means 'Size' always reflects the size of the
170 * actual sample data, the buffer might be bigger though). Silence
171 * samples past the official buffer are needed for differential
172 * algorithms that always have to take subsequent samples into account
173 * (resampling/interpolation would be an important example) and avoids
174 * memory access faults in such cases.
175 *
176 * @param NullSamplesCount - number of silence samples the buffer should
177 * be extended past it's data end
178 * @returns buffer_t structure with start address and
179 * size of the buffer in bytes
180 * @see ReleaseSampleData(), Read(), SetPos()
181 */
182 buffer_t Sample::LoadSampleDataWithNullSamplesExtension(uint NullSamplesCount) {
183 return LoadSampleDataWithNullSamplesExtension(this->SamplesTotal, NullSamplesCount);
184 }
185
186 /**
187 * Reads (uncompresses if needed) and caches the first \a SampleCount
188 * numbers of SamplePoints in RAM. Use ReleaseSampleData() to free the
189 * memory space if you don't need the cached samples anymore. There is no
190 * guarantee that exactly \a SampleCount samples will be cached; this is
191 * not an error. The size will be eventually truncated e.g. to the
192 * beginning of a frame of a compressed sample. This is done for
193 * efficiency reasons while streaming the wave by your sampler engine
194 * later. Read the <i>Size</i> member of the <i>buffer_t</i> structure
195 * that will be returned to determine the actual cached samples, but note
196 * that the size is given in bytes! You get the number of actually cached
197 * samples by dividing it by the frame size of the sample:
198 *
199 * buffer_t buf = pSample->LoadSampleDataWithNullSamplesExtension(acquired_samples, null_samples);
200 * long cachedsamples = buf.Size / pSample->FrameSize;
201 *
202 * The method will add \a NullSamplesCount silence samples past the
203 * official buffer end (this won't affect the 'Size' member of the
204 * buffer_t structure, that means 'Size' always reflects the size of the
205 * actual sample data, the buffer might be bigger though). Silence
206 * samples past the official buffer are needed for differential
207 * algorithms that always have to take subsequent samples into account
208 * (resampling/interpolation would be an important example) and avoids
209 * memory access faults in such cases.
210 *
211 * @param SampleCount - number of sample points to load into RAM
212 * @param NullSamplesCount - number of silence samples the buffer should
213 * be extended past it's data end
214 * @returns buffer_t structure with start address and
215 * size of the cached sample data in bytes
216 * @see ReleaseSampleData(), Read(), SetPos()
217 */
218 buffer_t Sample::LoadSampleDataWithNullSamplesExtension(unsigned long SampleCount, uint NullSamplesCount) {
219 if (SampleCount > this->SamplesTotal) SampleCount = this->SamplesTotal;
220 if (RAMCache.pStart) delete[] (int8_t*) RAMCache.pStart;
221 unsigned long allocationsize = (SampleCount + NullSamplesCount) * this->FrameSize;
222 RAMCache.pStart = new int8_t[allocationsize];
223 RAMCache.Size = Read(RAMCache.pStart, SampleCount) * this->FrameSize;
224 RAMCache.NullExtensionSize = allocationsize - RAMCache.Size;
225 // fill the remaining buffer space with silence samples
226 memset((int8_t*)RAMCache.pStart + RAMCache.Size, 0, RAMCache.NullExtensionSize);
227 return GetCache();
228 }
229
230 /**
231 * Returns current cached sample points. A buffer_t structure will be
232 * returned which contains address pointer to the begin of the cache and
233 * the size of the cached sample data in bytes. Use
234 * <i>LoadSampleData()</i> to cache a specific amount of sample points in
235 * RAM.
236 *
237 * @returns buffer_t structure with current cached sample points
238 * @see LoadSampleData();
239 */
240 buffer_t Sample::GetCache() {
241 // return a copy of the buffer_t structure
242 buffer_t result;
243 result.Size = this->RAMCache.Size;
244 result.pStart = this->RAMCache.pStart;
245 result.NullExtensionSize = this->RAMCache.NullExtensionSize;
246 return result;
247 }
248
249 /**
250 * Frees the cached sample from RAM if loaded with
251 * <i>LoadSampleData()</i> previously.
252 *
253 * @see LoadSampleData();
254 */
255 void Sample::ReleaseSampleData() {
256 if (RAMCache.pStart) delete[] (int8_t*) RAMCache.pStart;
257 RAMCache.pStart = NULL;
258 RAMCache.Size = 0;
259 }
260
261 /**
262 * Sets the position within the sample (in sample points, not in
263 * bytes). Use this method and <i>Read()</i> if you don't want to load
264 * the sample into RAM, thus for disk streaming.
265 *
266 * Although the original Gigasampler engine doesn't allow positioning
267 * within compressed samples, I decided to implement it. Even though
268 * the Gigasampler format doesn't allow to define loops for compressed
269 * samples at the moment, positioning within compressed samples might be
270 * interesting for some sampler engines though. The only drawback about
271 * my decision is that it takes longer to load compressed gig Files on
272 * startup, because it's neccessary to scan the samples for some
273 * mandatory informations. But I think as it doesn't affect the runtime
274 * efficiency, nobody will have a problem with that.
275 *
276 * @param SampleCount number of sample points to jump
277 * @param Whence optional: to which relation \a SampleCount refers
278 * to, if omited <i>RIFF::stream_start</i> is assumed
279 * @returns the new sample position
280 * @see Read()
281 */
282 unsigned long Sample::SetPos(unsigned long SampleCount, RIFF::stream_whence_t Whence) {
283 if (Compressed) {
284 switch (Whence) {
285 case RIFF::stream_curpos:
286 this->SamplePos += SampleCount;
287 break;
288 case RIFF::stream_end:
289 this->SamplePos = this->SamplesTotal - 1 - SampleCount;
290 break;
291 case RIFF::stream_backward:
292 this->SamplePos -= SampleCount;
293 break;
294 case RIFF::stream_start: default:
295 this->SamplePos = SampleCount;
296 break;
297 }
298 if (this->SamplePos > this->SamplesTotal) this->SamplePos = this->SamplesTotal;
299
300 unsigned long frame = this->SamplePos / 2048; // to which frame to jump
301 this->FrameOffset = this->SamplePos % 2048; // offset (in sample points) within that frame
302 pCkData->SetPos(FrameTable[frame]); // set chunk pointer to the start of sought frame
303 return this->SamplePos;
304 }
305 else { // not compressed
306 unsigned long orderedBytes = SampleCount * this->FrameSize;
307 unsigned long result = pCkData->SetPos(orderedBytes, Whence);
308 return (result == orderedBytes) ? SampleCount
309 : result / this->FrameSize;
310 }
311 }
312
313 /**
314 * Returns the current position in the sample (in sample points).
315 */
316 unsigned long Sample::GetPos() {
317 if (Compressed) return SamplePos;
318 else return pCkData->GetPos() / FrameSize;
319 }
320
321 /**
322 * Reads \a SampleCount number of sample points from the position stored
323 * in \a pPlaybackState into the buffer pointed by \a pBuffer and moves
324 * the position within the sample respectively, this method honors the
325 * looping informations of the sample (if any). The sample wave stream
326 * will be decompressed on the fly if using a compressed sample. Use this
327 * method if you don't want to load the sample into RAM, thus for disk
328 * streaming. All this methods needs to know to proceed with streaming
329 * for the next time you call this method is stored in \a pPlaybackState.
330 * You have to allocate and initialize the playback_state_t structure by
331 * yourself before you use it to stream a sample:
332 *
333 * <i>
334 * gig::playback_state_t playbackstate; <br>
335 * playbackstate.position = 0; <br>
336 * playbackstate.reverse = false; <br>
337 * playbackstate.loop_cycles_left = pSample->LoopPlayCount; <br>
338 * </i>
339 *
340 * You don't have to take care of things like if there is actually a loop
341 * defined or if the current read position is located within a loop area.
342 * The method already handles such cases by itself.
343 *
344 * @param pBuffer destination buffer
345 * @param SampleCount number of sample points to read
346 * @param pPlaybackState will be used to store and reload the playback
347 * state for the next ReadAndLoop() call
348 * @returns number of successfully read sample points
349 */
350 unsigned long Sample::ReadAndLoop(void* pBuffer, unsigned long SampleCount, playback_state_t* pPlaybackState) {
351 unsigned long samplestoread = SampleCount, totalreadsamples = 0, readsamples, samplestoloopend;
352 uint8_t* pDst = (uint8_t*) pBuffer;
353
354 SetPos(pPlaybackState->position); // recover position from the last time
355
356 if (this->Loops && GetPos() <= this->LoopEnd) { // honor looping if there are loop points defined
357
358 switch (this->LoopType) {
359
360 case loop_type_bidirectional: { //TODO: not tested yet!
361 do {
362 // if not endless loop check if max. number of loop cycles have been passed
363 if (this->LoopPlayCount && !pPlaybackState->loop_cycles_left) break;
364
365 if (!pPlaybackState->reverse) { // forward playback
366 do {
367 samplestoloopend = this->LoopEnd - GetPos();
368 readsamples = Read(&pDst[totalreadsamples * this->FrameSize], Min(samplestoread, samplestoloopend));
369 samplestoread -= readsamples;
370 totalreadsamples += readsamples;
371 if (readsamples == samplestoloopend) {
372 pPlaybackState->reverse = true;
373 break;
374 }
375 } while (samplestoread && readsamples);
376 }
377 else { // backward playback
378
379 // as we can only read forward from disk, we have to
380 // determine the end position within the loop first,
381 // read forward from that 'end' and finally after
382 // reading, swap all sample frames so it reflects
383 // backward playback
384
385 unsigned long swapareastart = totalreadsamples;
386 unsigned long loopoffset = GetPos() - this->LoopStart;
387 unsigned long samplestoreadinloop = Min(samplestoread, loopoffset);
388 unsigned long reverseplaybackend = GetPos() - samplestoreadinloop;
389
390 SetPos(reverseplaybackend);
391
392 // read samples for backward playback
393 do {
394 readsamples = Read(&pDst[totalreadsamples * this->FrameSize], samplestoreadinloop);
395 samplestoreadinloop -= readsamples;
396 samplestoread -= readsamples;
397 totalreadsamples += readsamples;
398 } while (samplestoreadinloop && readsamples);
399
400 SetPos(reverseplaybackend); // pretend we really read backwards
401
402 if (reverseplaybackend == this->LoopStart) {
403 pPlaybackState->loop_cycles_left--;
404 pPlaybackState->reverse = false;
405 }
406
407 // reverse the sample frames for backward playback
408 SwapMemoryArea(&pDst[swapareastart * this->FrameSize], (totalreadsamples - swapareastart) * this->FrameSize, this->FrameSize);
409 }
410 } while (samplestoread && readsamples);
411 break;
412 }
413
414 case loop_type_backward: { // TODO: not tested yet!
415 // forward playback (not entered the loop yet)
416 if (!pPlaybackState->reverse) do {
417 samplestoloopend = this->LoopEnd - GetPos();
418 readsamples = Read(&pDst[totalreadsamples * this->FrameSize], Min(samplestoread, samplestoloopend));
419 samplestoread -= readsamples;
420 totalreadsamples += readsamples;
421 if (readsamples == samplestoloopend) {
422 pPlaybackState->reverse = true;
423 break;
424 }
425 } while (samplestoread && readsamples);
426
427 if (!samplestoread) break;
428
429 // as we can only read forward from disk, we have to
430 // determine the end position within the loop first,
431 // read forward from that 'end' and finally after
432 // reading, swap all sample frames so it reflects
433 // backward playback
434
435 unsigned long swapareastart = totalreadsamples;
436 unsigned long loopoffset = GetPos() - this->LoopStart;
437 unsigned long samplestoreadinloop = (this->LoopPlayCount) ? Min(samplestoread, pPlaybackState->loop_cycles_left * LoopSize - loopoffset)
438 : samplestoread;
439 unsigned long reverseplaybackend = this->LoopStart + Abs((loopoffset - samplestoreadinloop) % this->LoopSize);
440
441 SetPos(reverseplaybackend);
442
443 // read samples for backward playback
444 do {
445 // if not endless loop check if max. number of loop cycles have been passed
446 if (this->LoopPlayCount && !pPlaybackState->loop_cycles_left) break;
447 samplestoloopend = this->LoopEnd - GetPos();
448 readsamples = Read(&pDst[totalreadsamples * this->FrameSize], Min(samplestoreadinloop, samplestoloopend));
449 samplestoreadinloop -= readsamples;
450 samplestoread -= readsamples;
451 totalreadsamples += readsamples;
452 if (readsamples == samplestoloopend) {
453 pPlaybackState->loop_cycles_left--;
454 SetPos(this->LoopStart);
455 }
456 } while (samplestoreadinloop && readsamples);
457
458 SetPos(reverseplaybackend); // pretend we really read backwards
459
460 // reverse the sample frames for backward playback
461 SwapMemoryArea(&pDst[swapareastart * this->FrameSize], (totalreadsamples - swapareastart) * this->FrameSize, this->FrameSize);
462 break;
463 }
464
465 default: case loop_type_normal: {
466 do {
467 // if not endless loop check if max. number of loop cycles have been passed
468 if (this->LoopPlayCount && !pPlaybackState->loop_cycles_left) break;
469 samplestoloopend = this->LoopEnd - GetPos();
470 readsamples = Read(&pDst[totalreadsamples * this->FrameSize], Min(samplestoread, samplestoloopend));
471 samplestoread -= readsamples;
472 totalreadsamples += readsamples;
473 if (readsamples == samplestoloopend) {
474 pPlaybackState->loop_cycles_left--;
475 SetPos(this->LoopStart);
476 }
477 } while (samplestoread && readsamples);
478 break;
479 }
480 }
481 }
482
483 // read on without looping
484 if (samplestoread) do {
485 readsamples = Read(&pDst[totalreadsamples * this->FrameSize], samplestoread);
486 samplestoread -= readsamples;
487 totalreadsamples += readsamples;
488 } while (readsamples && samplestoread);
489
490 // store current position
491 pPlaybackState->position = GetPos();
492
493 return totalreadsamples;
494 }
495
496 /**
497 * Reads \a SampleCount number of sample points from the current
498 * position into the buffer pointed by \a pBuffer and increments the
499 * position within the sample. The sample wave stream will be
500 * decompressed on the fly if using a compressed sample. Use this method
501 * and <i>SetPos()</i> if you don't want to load the sample into RAM,
502 * thus for disk streaming.
503 *
504 * @param pBuffer destination buffer
505 * @param SampleCount number of sample points to read
506 * @returns number of successfully read sample points
507 * @see SetPos()
508 */
509 unsigned long Sample::Read(void* pBuffer, unsigned long SampleCount) {
510 if (SampleCount == 0) return 0;
511 if (!Compressed) {
512 if (BitDepth == 24) {
513 // 24 bit sample. For now just truncate to 16 bit.
514 int8_t* pSrc = (int8_t*)this->pDecompressionBuffer;
515 int8_t* pDst = (int8_t*)pBuffer;
516 unsigned long n = pCkData->Read(pSrc, SampleCount, FrameSize);
517 for (int i = SampleCount * (FrameSize / 3) ; i > 0 ; i--) {
518 pSrc++;
519 *pDst++ = *pSrc++;
520 *pDst++ = *pSrc++;
521 }
522 return SampleCount;
523 } else {
524 return pCkData->Read(pBuffer, SampleCount, FrameSize); //FIXME: channel inversion due to endian correction?
525 }
526 }
527 else { //FIXME: no support for mono compressed samples yet, are there any?
528 if (this->SamplePos >= this->SamplesTotal) return 0;
529 //TODO: efficiency: we simply assume here that all frames are compressed, maybe we should test for an average compression rate
530 // best case needed buffer size (all frames compressed)
531 unsigned long assumedsize = (SampleCount << 1) + // *2 (16 Bit, stereo, but assume all frames compressed)
532 (SampleCount >> 10) + // 10 bytes header per 2048 sample points
533 8194, // at least one worst case sample frame
534 remainingbytes = 0, // remaining bytes in the local buffer
535 remainingsamples = SampleCount,
536 copysamples;
537 int currentframeoffset = this->FrameOffset; // offset in current sample frame since last Read()
538 this->FrameOffset = 0;
539
540 if (assumedsize > this->DecompressionBufferSize) {
541 // local buffer reallocation - hope this won't happen
542 if (this->pDecompressionBuffer) delete[] (int8_t*) this->pDecompressionBuffer;
543 this->pDecompressionBuffer = new int8_t[assumedsize << 1]; // double of current needed size
544 this->DecompressionBufferSize = assumedsize;
545 }
546
547 int16_t compressionmode, left, dleft, right, dright;
548 int8_t* pSrc = (int8_t*) this->pDecompressionBuffer;
549 int16_t* pDst = (int16_t*) pBuffer;
550 remainingbytes = pCkData->Read(pSrc, assumedsize, 1);
551
552 while (remainingsamples) {
553
554 // reload from disk to local buffer if needed
555 if (remainingbytes < 8194) {
556 if (pCkData->GetState() != RIFF::stream_ready) {
557 this->SamplePos = this->SamplesTotal;
558 return (SampleCount - remainingsamples);
559 }
560 assumedsize = remainingsamples;
561 assumedsize = (assumedsize << 1) + // *2 (16 Bit, stereo, but assume all frames compressed)
562 (assumedsize >> 10) + // 10 bytes header per 2048 sample points
563 8194; // at least one worst case sample frame
564 pCkData->SetPos(remainingbytes, RIFF::stream_backward);
565 if (pCkData->RemainingBytes() < assumedsize) assumedsize = pCkData->RemainingBytes();
566 remainingbytes = pCkData->Read(this->pDecompressionBuffer, assumedsize, 1);
567 pSrc = (int8_t*) this->pDecompressionBuffer;
568 }
569
570 // determine how many samples in this frame to skip and read
571 if (remainingsamples >= 2048) {
572 copysamples = 2048 - currentframeoffset;
573 remainingsamples -= copysamples;
574 }
575 else {
576 copysamples = remainingsamples;
577 if (currentframeoffset + copysamples > 2048) {
578 copysamples = 2048 - currentframeoffset;
579 remainingsamples -= copysamples;
580 }
581 else {
582 pCkData->SetPos(remainingbytes, RIFF::stream_backward);
583 remainingsamples = 0;
584 this->FrameOffset = currentframeoffset + copysamples;
585 }
586 }
587
588 // decompress and copy current frame from local buffer to destination buffer
589 compressionmode = *(int16_t*)pSrc; pSrc+=2;
590 switch (compressionmode) {
591 case 1: // left channel compressed
592 remainingbytes -= 6150; // (left 8 bit, right 16 bit, +6 byte header)
593 if (!remainingsamples && copysamples == 2048)
594 pCkData->SetPos(remainingbytes, RIFF::stream_backward);
595
596 left = *(int16_t*)pSrc; pSrc+=2;
597 dleft = *(int16_t*)pSrc; pSrc+=2;
598 while (currentframeoffset) {
599 dleft -= *pSrc;
600 left -= dleft;
601 pSrc+=3; // 8 bit left channel, skip uncompressed right channel (16 bit)
602 currentframeoffset--;
603 }
604 while (copysamples) {
605 dleft -= *pSrc; pSrc++;
606 left -= dleft;
607 *pDst = left; pDst++;
608 *pDst = *(int16_t*)pSrc; pDst++; pSrc+=2;
609 copysamples--;
610 }
611 break;
612 case 256: // right channel compressed
613 remainingbytes -= 6150; // (left 16 bit, right 8 bit, +6 byte header)
614 if (!remainingsamples && copysamples == 2048)
615 pCkData->SetPos(remainingbytes, RIFF::stream_backward);
616
617 right = *(int16_t*)pSrc; pSrc+=2;
618 dright = *(int16_t*)pSrc; pSrc+=2;
619 if (currentframeoffset) {
620 pSrc+=2; // skip uncompressed left channel, now we can increment by 3
621 while (currentframeoffset) {
622 dright -= *pSrc;
623 right -= dright;
624 pSrc+=3; // 8 bit right channel, skip uncompressed left channel (16 bit)
625 currentframeoffset--;
626 }
627 pSrc-=2; // back aligned to left channel
628 }
629 while (copysamples) {
630 *pDst = *(int16_t*)pSrc; pDst++; pSrc+=2;
631 dright -= *pSrc; pSrc++;
632 right -= dright;
633 *pDst = right; pDst++;
634 copysamples--;
635 }
636 break;
637 case 257: // both channels compressed
638 remainingbytes -= 4106; // (left 8 bit, right 8 bit, +10 byte header)
639 if (!remainingsamples && copysamples == 2048)
640 pCkData->SetPos(remainingbytes, RIFF::stream_backward);
641
642 left = *(int16_t*)pSrc; pSrc+=2;
643 dleft = *(int16_t*)pSrc; pSrc+=2;
644 right = *(int16_t*)pSrc; pSrc+=2;
645 dright = *(int16_t*)pSrc; pSrc+=2;
646 while (currentframeoffset) {
647 dleft -= *pSrc; pSrc++;
648 left -= dleft;
649 dright -= *pSrc; pSrc++;
650 right -= dright;
651 currentframeoffset--;
652 }
653 while (copysamples) {
654 dleft -= *pSrc; pSrc++;
655 left -= dleft;
656 dright -= *pSrc; pSrc++;
657 right -= dright;
658 *pDst = left; pDst++;
659 *pDst = right; pDst++;
660 copysamples--;
661 }
662 break;
663 default: // both channels uncompressed
664 remainingbytes -= 8194; // (left 16 bit, right 16 bit, +2 byte header)
665 if (!remainingsamples && copysamples == 2048)
666 pCkData->SetPos(remainingbytes, RIFF::stream_backward);
667
668 pSrc += currentframeoffset << 2;
669 currentframeoffset = 0;
670 memcpy(pDst, pSrc, copysamples << 2);
671 pDst += copysamples << 1;
672 pSrc += copysamples << 2;
673 break;
674 }
675 }
676 this->SamplePos += (SampleCount - remainingsamples);
677 if (this->SamplePos > this->SamplesTotal) this->SamplePos = this->SamplesTotal;
678 return (SampleCount - remainingsamples);
679 }
680 }
681
682 Sample::~Sample() {
683 Instances--;
684 if (!Instances && pDecompressionBuffer) delete[] (int8_t*) pDecompressionBuffer;
685 if (FrameTable) delete[] FrameTable;
686 if (RAMCache.pStart) delete[] (int8_t*) RAMCache.pStart;
687 }
688
689
690
691 // *************** DimensionRegion ***************
692 // *
693
694 uint DimensionRegion::Instances = 0;
695 DimensionRegion::VelocityTableMap* DimensionRegion::pVelocityTables = NULL;
696
697 DimensionRegion::DimensionRegion(RIFF::List* _3ewl) : DLS::Sampler(_3ewl) {
698 Instances++;
699
700 memcpy(&Crossfade, &SamplerOptions, 4);
701 if (!pVelocityTables) pVelocityTables = new VelocityTableMap;
702
703 RIFF::Chunk* _3ewa = _3ewl->GetSubChunk(CHUNK_ID_3EWA);
704 _3ewa->ReadInt32(); // unknown, always 0x0000008C ?
705 LFO3Frequency = (double) GIG_EXP_DECODE(_3ewa->ReadInt32());
706 EG3Attack = (double) GIG_EXP_DECODE(_3ewa->ReadInt32());
707 _3ewa->ReadInt16(); // unknown
708 LFO1InternalDepth = _3ewa->ReadUint16();
709 _3ewa->ReadInt16(); // unknown
710 LFO3InternalDepth = _3ewa->ReadInt16();
711 _3ewa->ReadInt16(); // unknown
712 LFO1ControlDepth = _3ewa->ReadUint16();
713 _3ewa->ReadInt16(); // unknown
714 LFO3ControlDepth = _3ewa->ReadInt16();
715 EG1Attack = (double) GIG_EXP_DECODE(_3ewa->ReadInt32());
716 EG1Decay1 = (double) GIG_EXP_DECODE(_3ewa->ReadInt32());
717 _3ewa->ReadInt16(); // unknown
718 EG1Sustain = _3ewa->ReadUint16();
719 EG1Release = (double) GIG_EXP_DECODE(_3ewa->ReadInt32());
720 EG1Controller = DecodeLeverageController(static_cast<_lev_ctrl_t>(_3ewa->ReadUint8()));
721 uint8_t eg1ctrloptions = _3ewa->ReadUint8();
722 EG1ControllerInvert = eg1ctrloptions & 0x01;
723 EG1ControllerAttackInfluence = GIG_EG_CTR_ATTACK_INFLUENCE_EXTRACT(eg1ctrloptions);
724 EG1ControllerDecayInfluence = GIG_EG_CTR_DECAY_INFLUENCE_EXTRACT(eg1ctrloptions);
725 EG1ControllerReleaseInfluence = GIG_EG_CTR_RELEASE_INFLUENCE_EXTRACT(eg1ctrloptions);
726 EG2Controller = DecodeLeverageController(static_cast<_lev_ctrl_t>(_3ewa->ReadUint8()));
727 uint8_t eg2ctrloptions = _3ewa->ReadUint8();
728 EG2ControllerInvert = eg2ctrloptions & 0x01;
729 EG2ControllerAttackInfluence = GIG_EG_CTR_ATTACK_INFLUENCE_EXTRACT(eg2ctrloptions);
730 EG2ControllerDecayInfluence = GIG_EG_CTR_DECAY_INFLUENCE_EXTRACT(eg2ctrloptions);
731 EG2ControllerReleaseInfluence = GIG_EG_CTR_RELEASE_INFLUENCE_EXTRACT(eg2ctrloptions);
732 LFO1Frequency = (double) GIG_EXP_DECODE(_3ewa->ReadInt32());
733 EG2Attack = (double) GIG_EXP_DECODE(_3ewa->ReadInt32());
734 EG2Decay1 = (double) GIG_EXP_DECODE(_3ewa->ReadInt32());
735 _3ewa->ReadInt16(); // unknown
736 EG2Sustain = _3ewa->ReadUint16();
737 EG2Release = (double) GIG_EXP_DECODE(_3ewa->ReadInt32());
738 _3ewa->ReadInt16(); // unknown
739 LFO2ControlDepth = _3ewa->ReadUint16();
740 LFO2Frequency = (double) GIG_EXP_DECODE(_3ewa->ReadInt32());
741 _3ewa->ReadInt16(); // unknown
742 LFO2InternalDepth = _3ewa->ReadUint16();
743 int32_t eg1decay2 = _3ewa->ReadInt32();
744 EG1Decay2 = (double) GIG_EXP_DECODE(eg1decay2);
745 EG1InfiniteSustain = (eg1decay2 == 0x7fffffff);
746 _3ewa->ReadInt16(); // unknown
747 EG1PreAttack = _3ewa->ReadUint16();
748 int32_t eg2decay2 = _3ewa->ReadInt32();
749 EG2Decay2 = (double) GIG_EXP_DECODE(eg2decay2);
750 EG2InfiniteSustain = (eg2decay2 == 0x7fffffff);
751 _3ewa->ReadInt16(); // unknown
752 EG2PreAttack = _3ewa->ReadUint16();
753 uint8_t velocityresponse = _3ewa->ReadUint8();
754 if (velocityresponse < 5) {
755 VelocityResponseCurve = curve_type_nonlinear;
756 VelocityResponseDepth = velocityresponse;
757 }
758 else if (velocityresponse < 10) {
759 VelocityResponseCurve = curve_type_linear;
760 VelocityResponseDepth = velocityresponse - 5;
761 }
762 else if (velocityresponse < 15) {
763 VelocityResponseCurve = curve_type_special;
764 VelocityResponseDepth = velocityresponse - 10;
765 }
766 else {
767 VelocityResponseCurve = curve_type_unknown;
768 VelocityResponseDepth = 0;
769 }
770 uint8_t releasevelocityresponse = _3ewa->ReadUint8();
771 if (releasevelocityresponse < 5) {
772 ReleaseVelocityResponseCurve = curve_type_nonlinear;
773 ReleaseVelocityResponseDepth = releasevelocityresponse;
774 }
775 else if (releasevelocityresponse < 10) {
776 ReleaseVelocityResponseCurve = curve_type_linear;
777 ReleaseVelocityResponseDepth = releasevelocityresponse - 5;
778 }
779 else if (releasevelocityresponse < 15) {
780 ReleaseVelocityResponseCurve = curve_type_special;
781 ReleaseVelocityResponseDepth = releasevelocityresponse - 10;
782 }
783 else {
784 ReleaseVelocityResponseCurve = curve_type_unknown;
785 ReleaseVelocityResponseDepth = 0;
786 }
787 VelocityResponseCurveScaling = _3ewa->ReadUint8();
788 AttenuationControllerThreshold = _3ewa->ReadInt8();
789 _3ewa->ReadInt32(); // unknown
790 SampleStartOffset = (uint16_t) _3ewa->ReadInt16();
791 _3ewa->ReadInt16(); // unknown
792 uint8_t pitchTrackDimensionBypass = _3ewa->ReadInt8();
793 PitchTrack = GIG_PITCH_TRACK_EXTRACT(pitchTrackDimensionBypass);
794 if (pitchTrackDimensionBypass & 0x10) DimensionBypass = dim_bypass_ctrl_94;
795 else if (pitchTrackDimensionBypass & 0x20) DimensionBypass = dim_bypass_ctrl_95;
796 else DimensionBypass = dim_bypass_ctrl_none;
797 uint8_t pan = _3ewa->ReadUint8();
798 Pan = (pan < 64) ? pan : -((int)pan - 63); // signed 7 bit -> signed 8 bit
799 SelfMask = _3ewa->ReadInt8() & 0x01;
800 _3ewa->ReadInt8(); // unknown
801 uint8_t lfo3ctrl = _3ewa->ReadUint8();
802 LFO3Controller = static_cast<lfo3_ctrl_t>(lfo3ctrl & 0x07); // lower 3 bits
803 LFO3Sync = lfo3ctrl & 0x20; // bit 5
804 InvertAttenuationController = lfo3ctrl & 0x80; // bit 7
805 AttenuationController = DecodeLeverageController(static_cast<_lev_ctrl_t>(_3ewa->ReadUint8()));
806 uint8_t lfo2ctrl = _3ewa->ReadUint8();
807 LFO2Controller = static_cast<lfo2_ctrl_t>(lfo2ctrl & 0x07); // lower 3 bits
808 LFO2FlipPhase = lfo2ctrl & 0x80; // bit 7
809 LFO2Sync = lfo2ctrl & 0x20; // bit 5
810 bool extResonanceCtrl = lfo2ctrl & 0x40; // bit 6
811 uint8_t lfo1ctrl = _3ewa->ReadUint8();
812 LFO1Controller = static_cast<lfo1_ctrl_t>(lfo1ctrl & 0x07); // lower 3 bits
813 LFO1FlipPhase = lfo1ctrl & 0x80; // bit 7
814 LFO1Sync = lfo1ctrl & 0x40; // bit 6
815 VCFResonanceController = (extResonanceCtrl) ? static_cast<vcf_res_ctrl_t>(GIG_VCF_RESONANCE_CTRL_EXTRACT(lfo1ctrl))
816 : vcf_res_ctrl_none;
817 uint16_t eg3depth = _3ewa->ReadUint16();
818 EG3Depth = (eg3depth <= 1200) ? eg3depth /* positives */
819 : (-1) * (int16_t) ((eg3depth ^ 0xffff) + 1); /* binary complementary for negatives */
820 _3ewa->ReadInt16(); // unknown
821 ChannelOffset = _3ewa->ReadUint8() / 4;
822 uint8_t regoptions = _3ewa->ReadUint8();
823 MSDecode = regoptions & 0x01; // bit 0
824 SustainDefeat = regoptions & 0x02; // bit 1
825 _3ewa->ReadInt16(); // unknown
826 VelocityUpperLimit = _3ewa->ReadInt8();
827 _3ewa->ReadInt8(); // unknown
828 _3ewa->ReadInt16(); // unknown
829 ReleaseTriggerDecay = _3ewa->ReadUint8(); // release trigger decay
830 _3ewa->ReadInt8(); // unknown
831 _3ewa->ReadInt8(); // unknown
832 EG1Hold = _3ewa->ReadUint8() & 0x80; // bit 7
833 uint8_t vcfcutoff = _3ewa->ReadUint8();
834 VCFEnabled = vcfcutoff & 0x80; // bit 7
835 VCFCutoff = vcfcutoff & 0x7f; // lower 7 bits
836 VCFCutoffController = static_cast<vcf_cutoff_ctrl_t>(_3ewa->ReadUint8());
837 VCFVelocityScale = _3ewa->ReadUint8();
838 _3ewa->ReadInt8(); // unknown
839 uint8_t vcfresonance = _3ewa->ReadUint8();
840 VCFResonance = vcfresonance & 0x7f; // lower 7 bits
841 VCFResonanceDynamic = !(vcfresonance & 0x80); // bit 7
842 uint8_t vcfbreakpoint = _3ewa->ReadUint8();
843 VCFKeyboardTracking = vcfbreakpoint & 0x80; // bit 7
844 VCFKeyboardTrackingBreakpoint = vcfbreakpoint & 0x7f; // lower 7 bits
845 uint8_t vcfvelocity = _3ewa->ReadUint8();
846 VCFVelocityDynamicRange = vcfvelocity % 5;
847 VCFVelocityCurve = static_cast<curve_type_t>(vcfvelocity / 5);
848 VCFType = static_cast<vcf_type_t>(_3ewa->ReadUint8());
849 if (VCFType == vcf_type_lowpass) {
850 if (lfo3ctrl & 0x40) // bit 6
851 VCFType = vcf_type_lowpassturbo;
852 }
853
854 // get the corresponding velocity->volume table from the table map or create & calculate that table if it doesn't exist yet
855 uint32_t tableKey = (VelocityResponseCurve<<16) | (VelocityResponseDepth<<8) | VelocityResponseCurveScaling;
856 if (pVelocityTables->count(tableKey)) { // if key exists
857 pVelocityAttenuationTable = (*pVelocityTables)[tableKey];
858 }
859 else {
860 pVelocityAttenuationTable =
861 CreateVelocityTable(VelocityResponseCurve,
862 VelocityResponseDepth,
863 VelocityResponseCurveScaling);
864 (*pVelocityTables)[tableKey] = pVelocityAttenuationTable; // put the new table into the tables map
865 }
866 }
867
868 leverage_ctrl_t DimensionRegion::DecodeLeverageController(_lev_ctrl_t EncodedController) {
869 leverage_ctrl_t decodedcontroller;
870 switch (EncodedController) {
871 // special controller
872 case _lev_ctrl_none:
873 decodedcontroller.type = leverage_ctrl_t::type_none;
874 decodedcontroller.controller_number = 0;
875 break;
876 case _lev_ctrl_velocity:
877 decodedcontroller.type = leverage_ctrl_t::type_velocity;
878 decodedcontroller.controller_number = 0;
879 break;
880 case _lev_ctrl_channelaftertouch:
881 decodedcontroller.type = leverage_ctrl_t::type_channelaftertouch;
882 decodedcontroller.controller_number = 0;
883 break;
884
885 // ordinary MIDI control change controller
886 case _lev_ctrl_modwheel:
887 decodedcontroller.type = leverage_ctrl_t::type_controlchange;
888 decodedcontroller.controller_number = 1;
889 break;
890 case _lev_ctrl_breath:
891 decodedcontroller.type = leverage_ctrl_t::type_controlchange;
892 decodedcontroller.controller_number = 2;
893 break;
894 case _lev_ctrl_foot:
895 decodedcontroller.type = leverage_ctrl_t::type_controlchange;
896 decodedcontroller.controller_number = 4;
897 break;
898 case _lev_ctrl_effect1:
899 decodedcontroller.type = leverage_ctrl_t::type_controlchange;
900 decodedcontroller.controller_number = 12;
901 break;
902 case _lev_ctrl_effect2:
903 decodedcontroller.type = leverage_ctrl_t::type_controlchange;
904 decodedcontroller.controller_number = 13;
905 break;
906 case _lev_ctrl_genpurpose1:
907 decodedcontroller.type = leverage_ctrl_t::type_controlchange;
908 decodedcontroller.controller_number = 16;
909 break;
910 case _lev_ctrl_genpurpose2:
911 decodedcontroller.type = leverage_ctrl_t::type_controlchange;
912 decodedcontroller.controller_number = 17;
913 break;
914 case _lev_ctrl_genpurpose3:
915 decodedcontroller.type = leverage_ctrl_t::type_controlchange;
916 decodedcontroller.controller_number = 18;
917 break;
918 case _lev_ctrl_genpurpose4:
919 decodedcontroller.type = leverage_ctrl_t::type_controlchange;
920 decodedcontroller.controller_number = 19;
921 break;
922 case _lev_ctrl_portamentotime:
923 decodedcontroller.type = leverage_ctrl_t::type_controlchange;
924 decodedcontroller.controller_number = 5;
925 break;
926 case _lev_ctrl_sustainpedal:
927 decodedcontroller.type = leverage_ctrl_t::type_controlchange;
928 decodedcontroller.controller_number = 64;
929 break;
930 case _lev_ctrl_portamento:
931 decodedcontroller.type = leverage_ctrl_t::type_controlchange;
932 decodedcontroller.controller_number = 65;
933 break;
934 case _lev_ctrl_sostenutopedal:
935 decodedcontroller.type = leverage_ctrl_t::type_controlchange;
936 decodedcontroller.controller_number = 66;
937 break;
938 case _lev_ctrl_softpedal:
939 decodedcontroller.type = leverage_ctrl_t::type_controlchange;
940 decodedcontroller.controller_number = 67;
941 break;
942 case _lev_ctrl_genpurpose5:
943 decodedcontroller.type = leverage_ctrl_t::type_controlchange;
944 decodedcontroller.controller_number = 80;
945 break;
946 case _lev_ctrl_genpurpose6:
947 decodedcontroller.type = leverage_ctrl_t::type_controlchange;
948 decodedcontroller.controller_number = 81;
949 break;
950 case _lev_ctrl_genpurpose7:
951 decodedcontroller.type = leverage_ctrl_t::type_controlchange;
952 decodedcontroller.controller_number = 82;
953 break;
954 case _lev_ctrl_genpurpose8:
955 decodedcontroller.type = leverage_ctrl_t::type_controlchange;
956 decodedcontroller.controller_number = 83;
957 break;
958 case _lev_ctrl_effect1depth:
959 decodedcontroller.type = leverage_ctrl_t::type_controlchange;
960 decodedcontroller.controller_number = 91;
961 break;
962 case _lev_ctrl_effect2depth:
963 decodedcontroller.type = leverage_ctrl_t::type_controlchange;
964 decodedcontroller.controller_number = 92;
965 break;
966 case _lev_ctrl_effect3depth:
967 decodedcontroller.type = leverage_ctrl_t::type_controlchange;
968 decodedcontroller.controller_number = 93;
969 break;
970 case _lev_ctrl_effect4depth:
971 decodedcontroller.type = leverage_ctrl_t::type_controlchange;
972 decodedcontroller.controller_number = 94;
973 break;
974 case _lev_ctrl_effect5depth:
975 decodedcontroller.type = leverage_ctrl_t::type_controlchange;
976 decodedcontroller.controller_number = 95;
977 break;
978
979 // unknown controller type
980 default:
981 throw gig::Exception("Unknown leverage controller type.");
982 }
983 return decodedcontroller;
984 }
985
986 DimensionRegion::~DimensionRegion() {
987 Instances--;
988 if (!Instances) {
989 // delete the velocity->volume tables
990 VelocityTableMap::iterator iter;
991 for (iter = pVelocityTables->begin(); iter != pVelocityTables->end(); iter++) {
992 double* pTable = iter->second;
993 if (pTable) delete[] pTable;
994 }
995 pVelocityTables->clear();
996 delete pVelocityTables;
997 pVelocityTables = NULL;
998 }
999 }
1000
1001 /**
1002 * Returns the correct amplitude factor for the given \a MIDIKeyVelocity.
1003 * All involved parameters (VelocityResponseCurve, VelocityResponseDepth
1004 * and VelocityResponseCurveScaling) involved are taken into account to
1005 * calculate the amplitude factor. Use this method when a key was
1006 * triggered to get the volume with which the sample should be played
1007 * back.
1008 *
1009 * @param MIDIKeyVelocity MIDI velocity value of the triggered key (between 0 and 127)
1010 * @returns amplitude factor (between 0.0 and 1.0)
1011 */
1012 double DimensionRegion::GetVelocityAttenuation(uint8_t MIDIKeyVelocity) {
1013 return pVelocityAttenuationTable[MIDIKeyVelocity];
1014 }
1015
1016 double* DimensionRegion::CreateVelocityTable(curve_type_t curveType, uint8_t depth, uint8_t scaling) {
1017
1018 // line-segment approximations of the 15 velocity curves
1019
1020 // linear
1021 const int lin0[] = { 1, 1, 127, 127 };
1022 const int lin1[] = { 1, 21, 127, 127 };
1023 const int lin2[] = { 1, 45, 127, 127 };
1024 const int lin3[] = { 1, 74, 127, 127 };
1025 const int lin4[] = { 1, 127, 127, 127 };
1026
1027 // non-linear
1028 const int non0[] = { 1, 4, 24, 5, 57, 17, 92, 57, 122, 127, 127, 127 };
1029 const int non1[] = { 1, 4, 46, 9, 93, 56, 118, 106, 123, 127,
1030 127, 127 };
1031 const int non2[] = { 1, 4, 46, 9, 57, 20, 102, 107, 107, 127,
1032 127, 127 };
1033 const int non3[] = { 1, 15, 10, 19, 67, 73, 80, 80, 90, 98, 98, 127,
1034 127, 127 };
1035 const int non4[] = { 1, 25, 33, 57, 82, 81, 92, 127, 127, 127 };
1036
1037 // special
1038 const int spe0[] = { 1, 2, 76, 10, 90, 15, 95, 20, 99, 28, 103, 44,
1039 113, 127, 127, 127 };
1040 const int spe1[] = { 1, 2, 27, 5, 67, 18, 89, 29, 95, 35, 107, 67,
1041 118, 127, 127, 127 };
1042 const int spe2[] = { 1, 1, 33, 1, 53, 5, 61, 13, 69, 32, 79, 74,
1043 85, 90, 91, 127, 127, 127 };
1044 const int spe3[] = { 1, 32, 28, 35, 66, 48, 89, 59, 95, 65, 99, 73,
1045 117, 127, 127, 127 };
1046 const int spe4[] = { 1, 4, 23, 5, 49, 13, 57, 17, 92, 57, 122, 127,
1047 127, 127 };
1048
1049 const int* const curves[] = { non0, non1, non2, non3, non4,
1050 lin0, lin1, lin2, lin3, lin4,
1051 spe0, spe1, spe2, spe3, spe4 };
1052
1053 double* const table = new double[128];
1054
1055 const int* curve = curves[curveType * 5 + depth];
1056 const int s = scaling == 0 ? 20 : scaling; // 0 or 20 means no scaling
1057
1058 table[0] = 0;
1059 for (int x = 1 ; x < 128 ; x++) {
1060
1061 if (x > curve[2]) curve += 2;
1062 double y = curve[1] + (x - curve[0]) *
1063 (double(curve[3] - curve[1]) / (curve[2] - curve[0]));
1064 y = y / 127;
1065
1066 // Scale up for s > 20, down for s < 20. When
1067 // down-scaling, the curve still ends at 1.0.
1068 if (s < 20 && y >= 0.5)
1069 y = y / ((2 - 40.0 / s) * y + 40.0 / s - 1);
1070 else
1071 y = y * (s / 20.0);
1072 if (y > 1) y = 1;
1073
1074 table[x] = y;
1075 }
1076 return table;
1077 }
1078
1079
1080 // *************** Region ***************
1081 // *
1082
1083 Region::Region(Instrument* pInstrument, RIFF::List* rgnList) : DLS::Region((DLS::Instrument*) pInstrument, rgnList) {
1084 // Initialization
1085 Dimensions = 0;
1086 for (int i = 0; i < 256; i++) {
1087 pDimensionRegions[i] = NULL;
1088 }
1089 Layers = 1;
1090 File* file = (File*) GetParent()->GetParent();
1091 int dimensionBits = (file->pVersion && file->pVersion->major == 3) ? 8 : 5;
1092
1093 // Actual Loading
1094
1095 LoadDimensionRegions(rgnList);
1096
1097 RIFF::Chunk* _3lnk = rgnList->GetSubChunk(CHUNK_ID_3LNK);
1098 if (_3lnk) {
1099 DimensionRegions = _3lnk->ReadUint32();
1100 for (int i = 0; i < dimensionBits; i++) {
1101 dimension_t dimension = static_cast<dimension_t>(_3lnk->ReadUint8());
1102 uint8_t bits = _3lnk->ReadUint8();
1103 if (dimension == dimension_none) { // inactive dimension
1104 pDimensionDefinitions[i].dimension = dimension_none;
1105 pDimensionDefinitions[i].bits = 0;
1106 pDimensionDefinitions[i].zones = 0;
1107 pDimensionDefinitions[i].split_type = split_type_bit;
1108 pDimensionDefinitions[i].ranges = NULL;
1109 pDimensionDefinitions[i].zone_size = 0;
1110 }
1111 else { // active dimension
1112 pDimensionDefinitions[i].dimension = dimension;
1113 pDimensionDefinitions[i].bits = bits;
1114 pDimensionDefinitions[i].zones = 0x01 << bits; // = pow(2,bits)
1115 pDimensionDefinitions[i].split_type = (dimension == dimension_layer ||
1116 dimension == dimension_samplechannel ||
1117 dimension == dimension_releasetrigger) ? split_type_bit
1118 : split_type_normal;
1119 pDimensionDefinitions[i].ranges = NULL; // it's not possible to check velocity dimensions for custom defined ranges at this point
1120 pDimensionDefinitions[i].zone_size =
1121 (pDimensionDefinitions[i].split_type == split_type_normal) ? 128 / pDimensionDefinitions[i].zones
1122 : 0;
1123 Dimensions++;
1124
1125 // if this is a layer dimension, remember the amount of layers
1126 if (dimension == dimension_layer) Layers = pDimensionDefinitions[i].zones;
1127 }
1128 _3lnk->SetPos(6, RIFF::stream_curpos); // jump forward to next dimension definition
1129 }
1130
1131 // check velocity dimension (if there is one) for custom defined zone ranges
1132 for (uint i = 0; i < Dimensions; i++) {
1133 dimension_def_t* pDimDef = pDimensionDefinitions + i;
1134 if (pDimDef->dimension == dimension_velocity) {
1135 if (pDimensionRegions[0]->VelocityUpperLimit == 0) {
1136 // no custom defined ranges
1137 pDimDef->split_type = split_type_normal;
1138 pDimDef->ranges = NULL;
1139 }
1140 else { // custom defined ranges
1141 pDimDef->split_type = split_type_customvelocity;
1142 pDimDef->ranges = new range_t[pDimDef->zones];
1143 uint8_t bits[8] = { 0 };
1144 int previousUpperLimit = -1;
1145 for (int velocityZone = 0; velocityZone < pDimDef->zones; velocityZone++) {
1146 bits[i] = velocityZone;
1147 DimensionRegion* pDimRegion = GetDimensionRegionByBit(bits);
1148
1149 pDimDef->ranges[velocityZone].low = previousUpperLimit + 1;
1150 pDimDef->ranges[velocityZone].high = pDimRegion->VelocityUpperLimit;
1151 previousUpperLimit = pDimDef->ranges[velocityZone].high;
1152 // fill velocity table
1153 for (int i = pDimDef->ranges[velocityZone].low; i <= pDimDef->ranges[velocityZone].high; i++) {
1154 VelocityTable[i] = velocityZone;
1155 }
1156 }
1157 }
1158 }
1159 }
1160
1161 // jump to start of the wave pool indices (if not already there)
1162 File* file = (File*) GetParent()->GetParent();
1163 if (file->pVersion && file->pVersion->major == 3)
1164 _3lnk->SetPos(68); // version 3 has a different 3lnk structure
1165 else
1166 _3lnk->SetPos(44);
1167
1168 // load sample references
1169 for (uint i = 0; i < DimensionRegions; i++) {
1170 uint32_t wavepoolindex = _3lnk->ReadUint32();
1171 pDimensionRegions[i]->pSample = GetSampleFromWavePool(wavepoolindex);
1172 }
1173 }
1174 else throw gig::Exception("Mandatory <3lnk> chunk not found.");
1175 }
1176
1177 void Region::LoadDimensionRegions(RIFF::List* rgn) {
1178 RIFF::List* _3prg = rgn->GetSubList(LIST_TYPE_3PRG);
1179 if (_3prg) {
1180 int dimensionRegionNr = 0;
1181 RIFF::List* _3ewl = _3prg->GetFirstSubList();
1182 while (_3ewl) {
1183 if (_3ewl->GetListType() == LIST_TYPE_3EWL) {
1184 pDimensionRegions[dimensionRegionNr] = new DimensionRegion(_3ewl);
1185 dimensionRegionNr++;
1186 }
1187 _3ewl = _3prg->GetNextSubList();
1188 }
1189 if (dimensionRegionNr == 0) throw gig::Exception("No dimension region found.");
1190 }
1191 }
1192
1193 Region::~Region() {
1194 for (uint i = 0; i < Dimensions; i++) {
1195 if (pDimensionDefinitions[i].ranges) delete[] pDimensionDefinitions[i].ranges;
1196 }
1197 for (int i = 0; i < 32; i++) {
1198 if (pDimensionRegions[i]) delete pDimensionRegions[i];
1199 }
1200 }
1201
1202 /**
1203 * Use this method in your audio engine to get the appropriate dimension
1204 * region with it's articulation data for the current situation. Just
1205 * call the method with the current MIDI controller values and you'll get
1206 * the DimensionRegion with the appropriate articulation data for the
1207 * current situation (for this Region of course only). To do that you'll
1208 * first have to look which dimensions with which controllers and in
1209 * which order are defined for this Region when you load the .gig file.
1210 * Special cases are e.g. layer or channel dimensions where you just put
1211 * in the index numbers instead of a MIDI controller value (means 0 for
1212 * left channel, 1 for right channel or 0 for layer 0, 1 for layer 1,
1213 * etc.).
1214 *
1215 * @param DimValues MIDI controller values (0-127) for dimension 0 to 7
1216 * @returns adress to the DimensionRegion for the given situation
1217 * @see pDimensionDefinitions
1218 * @see Dimensions
1219 */
1220 DimensionRegion* Region::GetDimensionRegionByValue(const uint DimValues[8]) {
1221 uint8_t bits[8] = { 0 };
1222 for (uint i = 0; i < Dimensions; i++) {
1223 bits[i] = DimValues[i];
1224 switch (pDimensionDefinitions[i].split_type) {
1225 case split_type_normal:
1226 bits[i] /= pDimensionDefinitions[i].zone_size;
1227 break;
1228 case split_type_customvelocity:
1229 bits[i] = VelocityTable[bits[i]];
1230 break;
1231 case split_type_bit: // the value is already the sought dimension bit number
1232 const uint8_t limiter_mask = (0xff << pDimensionDefinitions[i].bits) ^ 0xff;
1233 bits[i] = bits[i] & limiter_mask; // just make sure the value don't uses more bits than allowed
1234 break;
1235 }
1236 }
1237 return GetDimensionRegionByBit(bits);
1238 }
1239
1240 /**
1241 * Returns the appropriate DimensionRegion for the given dimension bit
1242 * numbers (zone index). You usually use <i>GetDimensionRegionByValue</i>
1243 * instead of calling this method directly!
1244 *
1245 * @param DimBits Bit numbers for dimension 0 to 7
1246 * @returns adress to the DimensionRegion for the given dimension
1247 * bit numbers
1248 * @see GetDimensionRegionByValue()
1249 */
1250 DimensionRegion* Region::GetDimensionRegionByBit(const uint8_t DimBits[8]) {
1251 return pDimensionRegions[((((((DimBits[7] << pDimensionDefinitions[6].bits | DimBits[6])
1252 << pDimensionDefinitions[5].bits | DimBits[5])
1253 << pDimensionDefinitions[4].bits | DimBits[4])
1254 << pDimensionDefinitions[3].bits | DimBits[3])
1255 << pDimensionDefinitions[2].bits | DimBits[2])
1256 << pDimensionDefinitions[1].bits | DimBits[1])
1257 << pDimensionDefinitions[0].bits | DimBits[0]];
1258 }
1259
1260 /**
1261 * Returns pointer address to the Sample referenced with this region.
1262 * This is the global Sample for the entire Region (not sure if this is
1263 * actually used by the Gigasampler engine - I would only use the Sample
1264 * referenced by the appropriate DimensionRegion instead of this sample).
1265 *
1266 * @returns address to Sample or NULL if there is no reference to a
1267 * sample saved in the .gig file
1268 */
1269 Sample* Region::GetSample() {
1270 if (pSample) return static_cast<gig::Sample*>(pSample);
1271 else return static_cast<gig::Sample*>(pSample = GetSampleFromWavePool(WavePoolTableIndex));
1272 }
1273
1274 Sample* Region::GetSampleFromWavePool(unsigned int WavePoolTableIndex) {
1275 File* file = (File*) GetParent()->GetParent();
1276 unsigned long soughtoffset = file->pWavePoolTable[WavePoolTableIndex];
1277 Sample* sample = file->GetFirstSample();
1278 while (sample) {
1279 if (sample->ulWavePoolOffset == soughtoffset) return static_cast<gig::Sample*>(pSample = sample);
1280 sample = file->GetNextSample();
1281 }
1282 return NULL;
1283 }
1284
1285
1286
1287 // *************** Instrument ***************
1288 // *
1289
1290 Instrument::Instrument(File* pFile, RIFF::List* insList) : DLS::Instrument((DLS::File*)pFile, insList) {
1291 // Initialization
1292 for (int i = 0; i < 128; i++) RegionKeyTable[i] = NULL;
1293 RegionIndex = -1;
1294
1295 // Loading
1296 RIFF::List* lart = insList->GetSubList(LIST_TYPE_LART);
1297 if (lart) {
1298 RIFF::Chunk* _3ewg = lart->GetSubChunk(CHUNK_ID_3EWG);
1299 if (_3ewg) {
1300 EffectSend = _3ewg->ReadUint16();
1301 Attenuation = _3ewg->ReadInt32();
1302 FineTune = _3ewg->ReadInt16();
1303 PitchbendRange = _3ewg->ReadInt16();
1304 uint8_t dimkeystart = _3ewg->ReadUint8();
1305 PianoReleaseMode = dimkeystart & 0x01;
1306 DimensionKeyRange.low = dimkeystart >> 1;
1307 DimensionKeyRange.high = _3ewg->ReadUint8();
1308 }
1309 else throw gig::Exception("Mandatory <3ewg> chunk not found.");
1310 }
1311 else throw gig::Exception("Mandatory <lart> list chunk not found.");
1312
1313 RIFF::List* lrgn = insList->GetSubList(LIST_TYPE_LRGN);
1314 if (!lrgn) throw gig::Exception("Mandatory chunks in <ins > chunk not found.");
1315 pRegions = new Region*[Regions];
1316 RIFF::List* rgn = lrgn->GetFirstSubList();
1317 unsigned int iRegion = 0;
1318 while (rgn) {
1319 if (rgn->GetListType() == LIST_TYPE_RGN) {
1320 pRegions[iRegion] = new Region(this, rgn);
1321 iRegion++;
1322 }
1323 rgn = lrgn->GetNextSubList();
1324 }
1325
1326 // Creating Region Key Table for fast lookup
1327 for (uint iReg = 0; iReg < Regions; iReg++) {
1328 for (int iKey = pRegions[iReg]->KeyRange.low; iKey <= pRegions[iReg]->KeyRange.high; iKey++) {
1329 RegionKeyTable[iKey] = pRegions[iReg];
1330 }
1331 }
1332 }
1333
1334 Instrument::~Instrument() {
1335 for (uint i = 0; i < Regions; i++) {
1336 if (pRegions) {
1337 if (pRegions[i]) delete (pRegions[i]);
1338 }
1339 delete[] pRegions;
1340 }
1341 }
1342
1343 /**
1344 * Returns the appropriate Region for a triggered note.
1345 *
1346 * @param Key MIDI Key number of triggered note / key (0 - 127)
1347 * @returns pointer adress to the appropriate Region or NULL if there
1348 * there is no Region defined for the given \a Key
1349 */
1350 Region* Instrument::GetRegion(unsigned int Key) {
1351 if (!pRegions || Key > 127) return NULL;
1352 return RegionKeyTable[Key];
1353 /*for (int i = 0; i < Regions; i++) {
1354 if (Key <= pRegions[i]->KeyRange.high &&
1355 Key >= pRegions[i]->KeyRange.low) return pRegions[i];
1356 }
1357 return NULL;*/
1358 }
1359
1360 /**
1361 * Returns the first Region of the instrument. You have to call this
1362 * method once before you use GetNextRegion().
1363 *
1364 * @returns pointer address to first region or NULL if there is none
1365 * @see GetNextRegion()
1366 */
1367 Region* Instrument::GetFirstRegion() {
1368 if (!Regions) return NULL;
1369 RegionIndex = 1;
1370 return pRegions[0];
1371 }
1372
1373 /**
1374 * Returns the next Region of the instrument. You have to call
1375 * GetFirstRegion() once before you can use this method. By calling this
1376 * method multiple times it iterates through the available Regions.
1377 *
1378 * @returns pointer address to the next region or NULL if end reached
1379 * @see GetFirstRegion()
1380 */
1381 Region* Instrument::GetNextRegion() {
1382 if (RegionIndex < 0 || RegionIndex >= Regions) return NULL;
1383 return pRegions[RegionIndex++];
1384 }
1385
1386
1387
1388 // *************** File ***************
1389 // *
1390
1391 File::File(RIFF::File* pRIFF) : DLS::File(pRIFF) {
1392 pSamples = NULL;
1393 pInstruments = NULL;
1394 }
1395
1396 Sample* File::GetFirstSample() {
1397 if (!pSamples) LoadSamples();
1398 if (!pSamples) return NULL;
1399 SamplesIterator = pSamples->begin();
1400 return static_cast<gig::Sample*>( (SamplesIterator != pSamples->end()) ? *SamplesIterator : NULL );
1401 }
1402
1403 Sample* File::GetNextSample() {
1404 if (!pSamples) return NULL;
1405 SamplesIterator++;
1406 return static_cast<gig::Sample*>( (SamplesIterator != pSamples->end()) ? *SamplesIterator : NULL );
1407 }
1408
1409 void File::LoadSamples() {
1410 RIFF::List* wvpl = pRIFF->GetSubList(LIST_TYPE_WVPL);
1411 if (wvpl) {
1412 unsigned long wvplFileOffset = wvpl->GetFilePos();
1413 RIFF::List* wave = wvpl->GetFirstSubList();
1414 while (wave) {
1415 if (wave->GetListType() == LIST_TYPE_WAVE) {
1416 if (!pSamples) pSamples = new SampleList;
1417 unsigned long waveFileOffset = wave->GetFilePos();
1418 pSamples->push_back(new Sample(this, wave, waveFileOffset - wvplFileOffset));
1419 }
1420 wave = wvpl->GetNextSubList();
1421 }
1422 }
1423 else throw gig::Exception("Mandatory <wvpl> chunk not found.");
1424 }
1425
1426 Instrument* File::GetFirstInstrument() {
1427 if (!pInstruments) LoadInstruments();
1428 if (!pInstruments) return NULL;
1429 InstrumentsIterator = pInstruments->begin();
1430 return (InstrumentsIterator != pInstruments->end()) ? *InstrumentsIterator : NULL;
1431 }
1432
1433 Instrument* File::GetNextInstrument() {
1434 if (!pInstruments) return NULL;
1435 InstrumentsIterator++;
1436 return (InstrumentsIterator != pInstruments->end()) ? *InstrumentsIterator : NULL;
1437 }
1438
1439 /**
1440 * Returns the instrument with the given index.
1441 *
1442 * @returns sought instrument or NULL if there's no such instrument
1443 */
1444 Instrument* File::GetInstrument(uint index) {
1445 if (!pInstruments) LoadInstruments();
1446 if (!pInstruments) return NULL;
1447 InstrumentsIterator = pInstruments->begin();
1448 for (uint i = 0; InstrumentsIterator != pInstruments->end(); i++) {
1449 if (i == index) return *InstrumentsIterator;
1450 InstrumentsIterator++;
1451 }
1452 return NULL;
1453 }
1454
1455 void File::LoadInstruments() {
1456 RIFF::List* lstInstruments = pRIFF->GetSubList(LIST_TYPE_LINS);
1457 if (lstInstruments) {
1458 RIFF::List* lstInstr = lstInstruments->GetFirstSubList();
1459 while (lstInstr) {
1460 if (lstInstr->GetListType() == LIST_TYPE_INS) {
1461 if (!pInstruments) pInstruments = new InstrumentList;
1462 pInstruments->push_back(new Instrument(this, lstInstr));
1463 }
1464 lstInstr = lstInstruments->GetNextSubList();
1465 }
1466 }
1467 else throw gig::Exception("Mandatory <lins> list chunk not found.");
1468 }
1469
1470
1471
1472 // *************** Exception ***************
1473 // *
1474
1475 Exception::Exception(String Message) : DLS::Exception(Message) {
1476 }
1477
1478 void Exception::PrintMessage() {
1479 std::cout << "gig::Exception: " << Message << std::endl;
1480 }
1481
1482 } // namespace gig

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