/[svn]/libgig/trunk/src/gig.cpp
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Revision 16 - (hide annotations) (download)
Sat Nov 29 14:56:16 2003 UTC (15 years, 11 months ago) by schoenebeck
File size: 53935 byte(s)
* src/gig.cpp, src/gig.h: added method GetVelocityAttenuation() to class
  DimensionRegion which takes the MIDI key velocity value as an argument
  and returns the appropriate volume factor (0.0-1.0) for the sample to be
  be played back, the velocity curve transformation functions used for this
  are only an approximation so far

1 schoenebeck 2 /***************************************************************************
2     * *
3     * libgig - C++ cross-platform Gigasampler format file loader library *
4     * *
5     * Copyright (C) 2003 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     MIDIPitchFraction = smpl->ReadInt32();
49     smpl->Read(&SMPTEFormat, 1, 4);
50     SMPTEOffset = smpl->ReadInt32();
51     Loops = smpl->ReadInt32();
52     LoopID = smpl->ReadInt32();
53     smpl->Read(&LoopType, 1, 4);
54     LoopStart = smpl->ReadInt32();
55     LoopEnd = smpl->ReadInt32();
56     LoopFraction = smpl->ReadInt32();
57     LoopPlayCount = smpl->ReadInt32();
58    
59     FrameTable = NULL;
60     SamplePos = 0;
61     RAMCache.Size = 0;
62     RAMCache.pStart = NULL;
63     RAMCache.NullExtensionSize = 0;
64    
65     Compressed = (waveList->GetSubChunk(CHUNK_ID_EWAV));
66     if (Compressed) {
67     ScanCompressedSample();
68     if (!pDecompressionBuffer) {
69     pDecompressionBuffer = new int8_t[INITIAL_SAMPLE_BUFFER_SIZE];
70     DecompressionBufferSize = INITIAL_SAMPLE_BUFFER_SIZE;
71     }
72     }
73     FrameOffset = 0; // just for streaming compressed samples
74     }
75    
76     /// Scans compressed samples for mandatory informations (e.g. actual number of total sample points).
77     void Sample::ScanCompressedSample() {
78     //TODO: we have to add some more scans here (e.g. determine compression rate)
79     this->SamplesTotal = 0;
80     std::list<unsigned long> frameOffsets;
81    
82     // Scanning
83     pCkData->SetPos(0);
84     while (pCkData->GetState() == RIFF::stream_ready) {
85     frameOffsets.push_back(pCkData->GetPos());
86     int16_t compressionmode = pCkData->ReadInt16();
87     this->SamplesTotal += 2048;
88     switch (compressionmode) {
89     case 1: // left channel compressed
90     case 256: // right channel compressed
91     pCkData->SetPos(6148, RIFF::stream_curpos);
92     break;
93     case 257: // both channels compressed
94     pCkData->SetPos(4104, RIFF::stream_curpos);
95     break;
96     default: // both channels uncompressed
97     pCkData->SetPos(8192, RIFF::stream_curpos);
98     }
99     }
100     pCkData->SetPos(0);
101    
102     //FIXME: only seen compressed samples with 16 bit stereo so far
103     this->FrameSize = 4;
104     this->BitDepth = 16;
105    
106     // Build the frames table (which is used for fast resolving of a frame's chunk offset)
107     if (FrameTable) delete[] FrameTable;
108     FrameTable = new unsigned long[frameOffsets.size()];
109     std::list<unsigned long>::iterator end = frameOffsets.end();
110     std::list<unsigned long>::iterator iter = frameOffsets.begin();
111     for (int i = 0; iter != end; i++, iter++) {
112     FrameTable[i] = *iter;
113     }
114     }
115    
116     /**
117     * Loads (and uncompresses if needed) the whole sample wave into RAM. Use
118     * ReleaseSampleData() to free the memory if you don't need the cached
119     * sample data anymore.
120     *
121     * @returns buffer_t structure with start address and size of the buffer
122     * in bytes
123     * @see ReleaseSampleData(), Read(), SetPos()
124     */
125     buffer_t Sample::LoadSampleData() {
126     return LoadSampleDataWithNullSamplesExtension(this->SamplesTotal, 0); // 0 amount of NullSamples
127     }
128    
129     /**
130     * Reads (uncompresses if needed) and caches the first \a SampleCount
131     * numbers of SamplePoints in RAM. Use ReleaseSampleData() to free the
132     * memory space if you don't need the cached samples anymore. There is no
133     * guarantee that exactly \a SampleCount samples will be cached; this is
134     * not an error. The size will be eventually truncated e.g. to the
135     * beginning of a frame of a compressed sample. This is done for
136     * efficiency reasons while streaming the wave by your sampler engine
137     * later. Read the <i>Size</i> member of the <i>buffer_t</i> structure
138     * that will be returned to determine the actual cached samples, but note
139     * that the size is given in bytes! You get the number of actually cached
140     * samples by dividing it by the frame size of the sample:
141     *
142     * buffer_t buf = pSample->LoadSampleData(acquired_samples);
143     * long cachedsamples = buf.Size / pSample->FrameSize;
144     *
145     * @param SampleCount - number of sample points to load into RAM
146     * @returns buffer_t structure with start address and size of
147     * the cached sample data in bytes
148     * @see ReleaseSampleData(), Read(), SetPos()
149     */
150     buffer_t Sample::LoadSampleData(unsigned long SampleCount) {
151     return LoadSampleDataWithNullSamplesExtension(SampleCount, 0); // 0 amount of NullSamples
152     }
153    
154     /**
155     * Loads (and uncompresses if needed) the whole sample wave into RAM. Use
156     * ReleaseSampleData() to free the memory if you don't need the cached
157     * sample data anymore.
158     * The method will add \a NullSamplesCount silence samples past the
159     * official buffer end (this won't affect the 'Size' member of the
160     * buffer_t structure, that means 'Size' always reflects the size of the
161     * actual sample data, the buffer might be bigger though). Silence
162     * samples past the official buffer are needed for differential
163     * algorithms that always have to take subsequent samples into account
164     * (resampling/interpolation would be an important example) and avoids
165     * memory access faults in such cases.
166     *
167     * @param NullSamplesCount - number of silence samples the buffer should
168     * be extended past it's data end
169     * @returns buffer_t structure with start address and
170     * size of the buffer in bytes
171     * @see ReleaseSampleData(), Read(), SetPos()
172     */
173     buffer_t Sample::LoadSampleDataWithNullSamplesExtension(uint NullSamplesCount) {
174     return LoadSampleDataWithNullSamplesExtension(this->SamplesTotal, NullSamplesCount);
175     }
176    
177     /**
178     * Reads (uncompresses if needed) and caches the first \a SampleCount
179     * numbers of SamplePoints in RAM. Use ReleaseSampleData() to free the
180     * memory space if you don't need the cached samples anymore. There is no
181     * guarantee that exactly \a SampleCount samples will be cached; this is
182     * not an error. The size will be eventually truncated e.g. to the
183     * beginning of a frame of a compressed sample. This is done for
184     * efficiency reasons while streaming the wave by your sampler engine
185     * later. Read the <i>Size</i> member of the <i>buffer_t</i> structure
186     * that will be returned to determine the actual cached samples, but note
187     * that the size is given in bytes! You get the number of actually cached
188     * samples by dividing it by the frame size of the sample:
189     *
190     * buffer_t buf = pSample->LoadSampleDataWithNullSamplesExtension(acquired_samples, null_samples);
191     * long cachedsamples = buf.Size / pSample->FrameSize;
192     *
193     * The method will add \a NullSamplesCount silence samples past the
194     * official buffer end (this won't affect the 'Size' member of the
195     * buffer_t structure, that means 'Size' always reflects the size of the
196     * actual sample data, the buffer might be bigger though). Silence
197     * samples past the official buffer are needed for differential
198     * algorithms that always have to take subsequent samples into account
199     * (resampling/interpolation would be an important example) and avoids
200     * memory access faults in such cases.
201     *
202     * @param SampleCount - number of sample points to load into RAM
203     * @param NullSamplesCount - number of silence samples the buffer should
204     * be extended past it's data end
205     * @returns buffer_t structure with start address and
206     * size of the cached sample data in bytes
207     * @see ReleaseSampleData(), Read(), SetPos()
208     */
209     buffer_t Sample::LoadSampleDataWithNullSamplesExtension(unsigned long SampleCount, uint NullSamplesCount) {
210     if (SampleCount > this->SamplesTotal) SampleCount = this->SamplesTotal;
211     if (RAMCache.pStart) delete[] (int8_t*) RAMCache.pStart;
212     unsigned long allocationsize = (SampleCount + NullSamplesCount) * this->FrameSize;
213     RAMCache.pStart = new int8_t[allocationsize];
214     RAMCache.Size = Read(RAMCache.pStart, SampleCount) * this->FrameSize;
215     RAMCache.NullExtensionSize = allocationsize - RAMCache.Size;
216     // fill the remaining buffer space with silence samples
217     memset((int8_t*)RAMCache.pStart + RAMCache.Size, 0, RAMCache.NullExtensionSize);
218     return GetCache();
219     }
220    
221     /**
222     * Returns current cached sample points. A buffer_t structure will be
223     * returned which contains address pointer to the begin of the cache and
224     * the size of the cached sample data in bytes. Use
225     * <i>LoadSampleData()</i> to cache a specific amount of sample points in
226     * RAM.
227     *
228     * @returns buffer_t structure with current cached sample points
229     * @see LoadSampleData();
230     */
231     buffer_t Sample::GetCache() {
232     // return a copy of the buffer_t structure
233     buffer_t result;
234     result.Size = this->RAMCache.Size;
235     result.pStart = this->RAMCache.pStart;
236     result.NullExtensionSize = this->RAMCache.NullExtensionSize;
237     return result;
238     }
239    
240     /**
241     * Frees the cached sample from RAM if loaded with
242     * <i>LoadSampleData()</i> previously.
243     *
244     * @see LoadSampleData();
245     */
246     void Sample::ReleaseSampleData() {
247     if (RAMCache.pStart) delete[] (int8_t*) RAMCache.pStart;
248     RAMCache.pStart = NULL;
249     RAMCache.Size = 0;
250     }
251    
252     /**
253     * Sets the position within the sample (in sample points, not in
254     * bytes). Use this method and <i>Read()</i> if you don't want to load
255     * the sample into RAM, thus for disk streaming.
256     *
257     * Although the original Gigasampler engine doesn't allow positioning
258     * within compressed samples, I decided to implement it. Even though
259     * the Gigasampler format doesn't allow to define loops for compressed
260     * samples at the moment, positioning within compressed samples might be
261     * interesting for some sampler engines though. The only drawback about
262     * my decision is that it takes longer to load compressed gig Files on
263     * startup, because it's neccessary to scan the samples for some
264     * mandatory informations. But I think as it doesn't affect the runtime
265     * efficiency, nobody will have a problem with that.
266     *
267     * @param SampleCount number of sample points to jump
268     * @param Whence optional: to which relation \a SampleCount refers
269     * to, if omited <i>RIFF::stream_start</i> is assumed
270     * @returns the new sample position
271     * @see Read()
272     */
273     unsigned long Sample::SetPos(unsigned long SampleCount, RIFF::stream_whence_t Whence) {
274     if (Compressed) {
275     switch (Whence) {
276     case RIFF::stream_curpos:
277     this->SamplePos += SampleCount;
278     break;
279     case RIFF::stream_end:
280     this->SamplePos = this->SamplesTotal - 1 - SampleCount;
281     break;
282     case RIFF::stream_backward:
283     this->SamplePos -= SampleCount;
284     break;
285     case RIFF::stream_start: default:
286     this->SamplePos = SampleCount;
287     break;
288     }
289     if (this->SamplePos > this->SamplesTotal) this->SamplePos = this->SamplesTotal;
290    
291     unsigned long frame = this->SamplePos / 2048; // to which frame to jump
292     this->FrameOffset = this->SamplePos % 2048; // offset (in sample points) within that frame
293     pCkData->SetPos(FrameTable[frame]); // set chunk pointer to the start of sought frame
294     return this->SamplePos;
295     }
296     else { // not compressed
297     unsigned long orderedBytes = SampleCount * this->FrameSize;
298     unsigned long result = pCkData->SetPos(orderedBytes, Whence);
299     return (result == orderedBytes) ? SampleCount
300     : result / this->FrameSize;
301     }
302     }
303    
304     /**
305     * Returns the current position in the sample (in sample points).
306     */
307     unsigned long Sample::GetPos() {
308     if (Compressed) return SamplePos;
309     else return pCkData->GetPos() / FrameSize;
310     }
311    
312     /**
313     * Reads \a SampleCount number of sample points from the current
314     * position into the buffer pointed by \a pBuffer and increments the
315     * position within the sample. The sample wave stream will be
316     * decompressed on the fly if using a compressed sample. Use this method
317     * and <i>SetPos()</i> if you don't want to load the sample into RAM,
318     * thus for disk streaming.
319     *
320     * @param pBuffer destination buffer
321     * @param SampleCount number of sample points to read
322     * @returns number of successfully read sample points
323     * @see SetPos()
324     */
325     unsigned long Sample::Read(void* pBuffer, unsigned long SampleCount) {
326 schoenebeck 11 if (!Compressed) return pCkData->Read(pBuffer, SampleCount, FrameSize); //FIXME: channel inversion due to endian correction?
327 schoenebeck 2 else { //FIXME: no support for mono compressed samples yet, are there any?
328 schoenebeck 11 if (this->SamplePos >= this->SamplesTotal) return 0;
329 schoenebeck 2 //TODO: efficiency: we simply assume here that all frames are compressed, maybe we should test for an average compression rate
330     // best case needed buffer size (all frames compressed)
331     unsigned long assumedsize = (SampleCount << 1) + // *2 (16 Bit, stereo, but assume all frames compressed)
332     (SampleCount >> 10) + // 10 bytes header per 2048 sample points
333     8194, // at least one worst case sample frame
334     remainingbytes = 0, // remaining bytes in the local buffer
335     remainingsamples = SampleCount,
336     copysamples;
337     int currentframeoffset = this->FrameOffset; // offset in current sample frame since last Read()
338     this->FrameOffset = 0;
339    
340     if (assumedsize > this->DecompressionBufferSize) {
341     // local buffer reallocation - hope this won't happen
342     if (this->pDecompressionBuffer) delete[] (int8_t*) this->pDecompressionBuffer;
343     this->pDecompressionBuffer = new int8_t[assumedsize << 1]; // double of current needed size
344     this->DecompressionBufferSize = assumedsize;
345     }
346    
347     int16_t compressionmode, left, dleft, right, dright;
348     int8_t* pSrc = (int8_t*) this->pDecompressionBuffer;
349     int16_t* pDst = (int16_t*) pBuffer;
350     remainingbytes = pCkData->Read(pSrc, assumedsize, 1);
351    
352     while (remainingsamples) {
353    
354     // reload from disk to local buffer if needed
355     if (remainingbytes < 8194) {
356     if (pCkData->GetState() != RIFF::stream_ready) {
357 schoenebeck 11 this->SamplePos = this->SamplesTotal;
358 schoenebeck 2 return (SampleCount - remainingsamples);
359     }
360     assumedsize = remainingsamples;
361     assumedsize = (assumedsize << 1) + // *2 (16 Bit, stereo, but assume all frames compressed)
362     (assumedsize >> 10) + // 10 bytes header per 2048 sample points
363     8194; // at least one worst case sample frame
364     pCkData->SetPos(remainingbytes, RIFF::stream_backward);
365     if (pCkData->RemainingBytes() < assumedsize) assumedsize = pCkData->RemainingBytes();
366     remainingbytes = pCkData->Read(this->pDecompressionBuffer, assumedsize, 1);
367     pSrc = (int8_t*) this->pDecompressionBuffer;
368     }
369    
370     // determine how many samples in this frame to skip and read
371     if (remainingsamples >= 2048) {
372     copysamples = 2048 - currentframeoffset;
373     remainingsamples -= copysamples;
374     }
375     else {
376     copysamples = remainingsamples;
377     if (currentframeoffset + copysamples > 2048) {
378     copysamples = 2048 - currentframeoffset;
379     remainingsamples -= copysamples;
380     }
381     else {
382     pCkData->SetPos(remainingbytes, RIFF::stream_backward);
383     remainingsamples = 0;
384     this->FrameOffset = currentframeoffset + copysamples;
385     }
386     }
387    
388     // decompress and copy current frame from local buffer to destination buffer
389     compressionmode = *(int16_t*)pSrc; pSrc+=2;
390     switch (compressionmode) {
391     case 1: // left channel compressed
392     remainingbytes -= 6150; // (left 8 bit, right 16 bit, +6 byte header)
393     if (!remainingsamples && copysamples == 2048)
394     pCkData->SetPos(remainingbytes, RIFF::stream_backward);
395    
396     left = *(int16_t*)pSrc; pSrc+=2;
397     dleft = *(int16_t*)pSrc; pSrc+=2;
398     while (currentframeoffset) {
399     dleft -= *pSrc;
400     left -= dleft;
401     pSrc+=3; // 8 bit left channel, skip uncompressed right channel (16 bit)
402     currentframeoffset--;
403     }
404     while (copysamples) {
405     dleft -= *pSrc; pSrc++;
406     left -= dleft;
407     *pDst = left; pDst++;
408     *pDst = *(int16_t*)pSrc; pDst++; pSrc+=2;
409     copysamples--;
410     }
411     break;
412     case 256: // right channel compressed
413     remainingbytes -= 6150; // (left 16 bit, right 8 bit, +6 byte header)
414     if (!remainingsamples && copysamples == 2048)
415     pCkData->SetPos(remainingbytes, RIFF::stream_backward);
416    
417     right = *(int16_t*)pSrc; pSrc+=2;
418     dright = *(int16_t*)pSrc; pSrc+=2;
419     if (currentframeoffset) {
420     pSrc+=2; // skip uncompressed left channel, now we can increment by 3
421     while (currentframeoffset) {
422     dright -= *pSrc;
423     right -= dright;
424     pSrc+=3; // 8 bit right channel, skip uncompressed left channel (16 bit)
425     currentframeoffset--;
426     }
427     pSrc-=2; // back aligned to left channel
428     }
429     while (copysamples) {
430     *pDst = *(int16_t*)pSrc; pDst++; pSrc+=2;
431     dright -= *pSrc; pSrc++;
432     right -= dright;
433     *pDst = right; pDst++;
434     copysamples--;
435     }
436     break;
437     case 257: // both channels compressed
438     remainingbytes -= 4106; // (left 8 bit, right 8 bit, +10 byte header)
439     if (!remainingsamples && copysamples == 2048)
440     pCkData->SetPos(remainingbytes, RIFF::stream_backward);
441    
442     left = *(int16_t*)pSrc; pSrc+=2;
443     dleft = *(int16_t*)pSrc; pSrc+=2;
444     right = *(int16_t*)pSrc; pSrc+=2;
445     dright = *(int16_t*)pSrc; pSrc+=2;
446     while (currentframeoffset) {
447     dleft -= *pSrc; pSrc++;
448     left -= dleft;
449     dright -= *pSrc; pSrc++;
450     right -= dright;
451     currentframeoffset--;
452     }
453     while (copysamples) {
454     dleft -= *pSrc; pSrc++;
455     left -= dleft;
456     dright -= *pSrc; pSrc++;
457     right -= dright;
458     *pDst = left; pDst++;
459     *pDst = right; pDst++;
460     copysamples--;
461     }
462     break;
463     default: // both channels uncompressed
464     remainingbytes -= 8194; // (left 16 bit, right 16 bit, +2 byte header)
465     if (!remainingsamples && copysamples == 2048)
466     pCkData->SetPos(remainingbytes, RIFF::stream_backward);
467    
468     pSrc += currentframeoffset << 2;
469     currentframeoffset = 0;
470     memcpy(pDst, pSrc, copysamples << 2);
471     pDst += copysamples << 1;
472     pSrc += copysamples << 2;
473     break;
474     }
475     }
476     this->SamplePos += (SampleCount - remainingsamples);
477 schoenebeck 11 if (this->SamplePos > this->SamplesTotal) this->SamplePos = this->SamplesTotal;
478 schoenebeck 2 return (SampleCount - remainingsamples);
479     }
480     }
481    
482     Sample::~Sample() {
483     Instances--;
484     if (!Instances && pDecompressionBuffer) delete[] (int8_t*) pDecompressionBuffer;
485     if (FrameTable) delete[] FrameTable;
486     if (RAMCache.pStart) delete[] (int8_t*) RAMCache.pStart;
487     }
488    
489    
490    
491     // *************** DimensionRegion ***************
492     // *
493    
494 schoenebeck 16 uint DimensionRegion::Instances = 0;
495     DimensionRegion::VelocityTableMap* DimensionRegion::pVelocityTables = NULL;
496    
497 schoenebeck 2 DimensionRegion::DimensionRegion(RIFF::List* _3ewl) : DLS::Sampler(_3ewl) {
498 schoenebeck 16 Instances++;
499    
500 schoenebeck 2 memcpy(&Crossfade, &SamplerOptions, 4);
501 schoenebeck 16 if (!pVelocityTables) pVelocityTables = new VelocityTableMap;
502 schoenebeck 2
503     RIFF::Chunk* _3ewa = _3ewl->GetSubChunk(CHUNK_ID_3EWA);
504     _3ewa->ReadInt32(); // unknown, allways 0x0000008C ?
505     LFO3Frequency = (double) GIG_EXP_DECODE(_3ewa->ReadInt32());
506     EG3Attack = (double) GIG_EXP_DECODE(_3ewa->ReadInt32());
507     _3ewa->ReadInt16(); // unknown
508     LFO1InternalDepth = _3ewa->ReadUint16();
509     _3ewa->ReadInt16(); // unknown
510     LFO3InternalDepth = _3ewa->ReadInt16();
511     _3ewa->ReadInt16(); // unknown
512     LFO1ControlDepth = _3ewa->ReadUint16();
513     _3ewa->ReadInt16(); // unknown
514     LFO3ControlDepth = _3ewa->ReadInt16();
515     EG1Attack = (double) GIG_EXP_DECODE(_3ewa->ReadInt32());
516     EG1Decay1 = (double) GIG_EXP_DECODE(_3ewa->ReadInt32());
517     _3ewa->ReadInt16(); // unknown
518     EG1Sustain = _3ewa->ReadUint16();
519     EG1Release = (double) GIG_EXP_DECODE(_3ewa->ReadInt32());
520     EG1Controller = static_cast<eg1_ctrl_t>(_3ewa->ReadUint8());
521     uint8_t eg1ctrloptions = _3ewa->ReadUint8();
522     EG1ControllerInvert = eg1ctrloptions & 0x01;
523     EG1ControllerAttackInfluence = GIG_EG_CTR_ATTACK_INFLUENCE_EXTRACT(eg1ctrloptions);
524     EG1ControllerDecayInfluence = GIG_EG_CTR_DECAY_INFLUENCE_EXTRACT(eg1ctrloptions);
525     EG1ControllerReleaseInfluence = GIG_EG_CTR_RELEASE_INFLUENCE_EXTRACT(eg1ctrloptions);
526     EG2Controller = static_cast<eg2_ctrl_t>(_3ewa->ReadUint8());
527     uint8_t eg2ctrloptions = _3ewa->ReadUint8();
528     EG2ControllerInvert = eg2ctrloptions & 0x01;
529     EG2ControllerAttackInfluence = GIG_EG_CTR_ATTACK_INFLUENCE_EXTRACT(eg2ctrloptions);
530     EG2ControllerDecayInfluence = GIG_EG_CTR_DECAY_INFLUENCE_EXTRACT(eg2ctrloptions);
531     EG2ControllerReleaseInfluence = GIG_EG_CTR_RELEASE_INFLUENCE_EXTRACT(eg2ctrloptions);
532     LFO1Frequency = (double) GIG_EXP_DECODE(_3ewa->ReadInt32());
533     EG2Attack = (double) GIG_EXP_DECODE(_3ewa->ReadInt32());
534     EG2Decay1 = (double) GIG_EXP_DECODE(_3ewa->ReadInt32());
535     _3ewa->ReadInt16(); // unknown
536     EG2Sustain = _3ewa->ReadUint16();
537     EG2Release = (double) GIG_EXP_DECODE(_3ewa->ReadInt32());
538     _3ewa->ReadInt16(); // unknown
539     LFO2ControlDepth = _3ewa->ReadUint16();
540     LFO2Frequency = (double) GIG_EXP_DECODE(_3ewa->ReadInt32());
541     _3ewa->ReadInt16(); // unknown
542     LFO2InternalDepth = _3ewa->ReadUint16();
543     int32_t eg1decay2 = _3ewa->ReadInt32();
544     EG1Decay2 = (double) GIG_EXP_DECODE(eg1decay2);
545     EG1InfiniteSustain = (eg1decay2 == 0x7fffffff);
546     _3ewa->ReadInt16(); // unknown
547     EG1PreAttack = _3ewa->ReadUint16();
548     int32_t eg2decay2 = _3ewa->ReadInt32();
549     EG2Decay2 = (double) GIG_EXP_DECODE(eg2decay2);
550     EG2InfiniteSustain = (eg2decay2 == 0x7fffffff);
551     _3ewa->ReadInt16(); // unknown
552     EG2PreAttack = _3ewa->ReadUint16();
553     uint8_t velocityresponse = _3ewa->ReadUint8();
554     if (velocityresponse < 5) {
555     VelocityResponseCurve = curve_type_nonlinear;
556     VelocityResponseDepth = velocityresponse;
557     }
558     else if (velocityresponse < 10) {
559     VelocityResponseCurve = curve_type_linear;
560     VelocityResponseDepth = velocityresponse - 5;
561     }
562     else if (velocityresponse < 15) {
563     VelocityResponseCurve = curve_type_special;
564     VelocityResponseDepth = velocityresponse - 10;
565     }
566     else {
567     VelocityResponseCurve = curve_type_unknown;
568     VelocityResponseDepth = 0;
569     }
570     uint8_t releasevelocityresponse = _3ewa->ReadUint8();
571     if (releasevelocityresponse < 5) {
572     ReleaseVelocityResponseCurve = curve_type_nonlinear;
573     ReleaseVelocityResponseDepth = releasevelocityresponse;
574     }
575     else if (releasevelocityresponse < 10) {
576     ReleaseVelocityResponseCurve = curve_type_linear;
577     ReleaseVelocityResponseDepth = releasevelocityresponse - 5;
578     }
579     else if (releasevelocityresponse < 15) {
580     ReleaseVelocityResponseCurve = curve_type_special;
581     ReleaseVelocityResponseDepth = releasevelocityresponse - 10;
582     }
583     else {
584     ReleaseVelocityResponseCurve = curve_type_unknown;
585     ReleaseVelocityResponseDepth = 0;
586     }
587     VelocityResponseCurveScaling = _3ewa->ReadUint8();
588     AttenuationControlTreshold = _3ewa->ReadInt8();
589     _3ewa->ReadInt32(); // unknown
590     SampleStartOffset = (uint16_t) _3ewa->ReadInt16();
591     _3ewa->ReadInt16(); // unknown
592     uint8_t pitchTrackDimensionBypass = _3ewa->ReadInt8();
593     PitchTrack = GIG_PITCH_TRACK_EXTRACT(pitchTrackDimensionBypass);
594     if (pitchTrackDimensionBypass & 0x10) DimensionBypass = dim_bypass_ctrl_94;
595     else if (pitchTrackDimensionBypass & 0x20) DimensionBypass = dim_bypass_ctrl_95;
596     else DimensionBypass = dim_bypass_ctrl_none;
597     uint8_t pan = _3ewa->ReadUint8();
598     Pan = (pan < 64) ? pan : (-1) * (int8_t)pan - 63;
599     SelfMask = _3ewa->ReadInt8() & 0x01;
600     _3ewa->ReadInt8(); // unknown
601     uint8_t lfo3ctrl = _3ewa->ReadUint8();
602     LFO3Controller = static_cast<lfo3_ctrl_t>(lfo3ctrl & 0x07); // lower 3 bits
603     LFO3Sync = lfo3ctrl & 0x20; // bit 5
604     InvertAttenuationControl = lfo3ctrl & 0x80; // bit 7
605     if (VCFType == vcf_type_lowpass) {
606     if (lfo3ctrl & 0x40) // bit 6
607     VCFType = vcf_type_lowpassturbo;
608     }
609     AttenuationControl = static_cast<attenuation_ctrl_t>(_3ewa->ReadUint8());
610     uint8_t lfo2ctrl = _3ewa->ReadUint8();
611     LFO2Controller = static_cast<lfo2_ctrl_t>(lfo2ctrl & 0x07); // lower 3 bits
612     LFO2FlipPhase = lfo2ctrl & 0x80; // bit 7
613     LFO2Sync = lfo2ctrl & 0x20; // bit 5
614     bool extResonanceCtrl = lfo2ctrl & 0x40; // bit 6
615     uint8_t lfo1ctrl = _3ewa->ReadUint8();
616     LFO1Controller = static_cast<lfo1_ctrl_t>(lfo1ctrl & 0x07); // lower 3 bits
617     LFO1FlipPhase = lfo1ctrl & 0x80; // bit 7
618     LFO1Sync = lfo1ctrl & 0x40; // bit 6
619     VCFResonanceController = (extResonanceCtrl) ? static_cast<vcf_res_ctrl_t>(GIG_VCF_RESONANCE_CTRL_EXTRACT(lfo1ctrl))
620     : vcf_res_ctrl_none;
621     uint16_t eg3depth = _3ewa->ReadUint16();
622     EG3Depth = (eg3depth <= 1200) ? eg3depth /* positives */
623     : (-1) * (int16_t) ((eg3depth ^ 0xffff) + 1); /* binary complementary for negatives */
624     _3ewa->ReadInt16(); // unknown
625     ChannelOffset = _3ewa->ReadUint8() / 4;
626     uint8_t regoptions = _3ewa->ReadUint8();
627     MSDecode = regoptions & 0x01; // bit 0
628     SustainDefeat = regoptions & 0x02; // bit 1
629     _3ewa->ReadInt16(); // unknown
630     VelocityUpperLimit = _3ewa->ReadInt8();
631     _3ewa->ReadInt8(); // unknown
632     _3ewa->ReadInt16(); // unknown
633     ReleaseTriggerDecay = _3ewa->ReadUint8(); // release trigger decay
634     _3ewa->ReadInt8(); // unknown
635     _3ewa->ReadInt8(); // unknown
636     EG1Hold = _3ewa->ReadUint8() & 0x80; // bit 7
637     uint8_t vcfcutoff = _3ewa->ReadUint8();
638     VCFEnabled = vcfcutoff & 0x80; // bit 7
639     VCFCutoff = vcfcutoff & 0x7f; // lower 7 bits
640     VCFCutoffController = static_cast<vcf_cutoff_ctrl_t>(_3ewa->ReadUint8());
641     VCFVelocityScale = _3ewa->ReadUint8();
642     _3ewa->ReadInt8(); // unknown
643     uint8_t vcfresonance = _3ewa->ReadUint8();
644     VCFResonance = vcfresonance & 0x7f; // lower 7 bits
645     VCFResonanceDynamic = !(vcfresonance & 0x80); // bit 7
646     uint8_t vcfbreakpoint = _3ewa->ReadUint8();
647     VCFKeyboardTracking = vcfbreakpoint & 0x80; // bit 7
648     VCFKeyboardTrackingBreakpoint = vcfbreakpoint & 0x7f; // lower 7 bits
649     uint8_t vcfvelocity = _3ewa->ReadUint8();
650     VCFVelocityDynamicRange = vcfvelocity % 5;
651     VCFVelocityCurve = static_cast<curve_type_t>(vcfvelocity / 5);
652     VCFType = static_cast<vcf_type_t>(_3ewa->ReadUint8());
653 schoenebeck 16
654     // get the corresponding velocity->volume table from the table map or create & calculate that table if it doesn't exist yet
655     uint32_t tableKey = (VelocityResponseCurve<<16) | (VelocityResponseDepth<<8) | VelocityResponseCurveScaling;
656     if (pVelocityTables->count(tableKey)) { // if key exists
657     pVelocityAttenuationTable = (*pVelocityTables)[tableKey];
658     }
659     else {
660     pVelocityAttenuationTable = new double[128];
661     switch (VelocityResponseCurve) { // calculate the new table
662     case curve_type_nonlinear:
663     for (int velocity = 0; velocity < 128; velocity++) {
664     pVelocityAttenuationTable[velocity] =
665     GIG_VELOCITY_TRANSFORM_NONLINEAR((double)(velocity+1),(double)(VelocityResponseDepth+1),(double)VelocityResponseCurveScaling);
666     if (pVelocityAttenuationTable[velocity] > 1.0) pVelocityAttenuationTable[velocity] = 1.0;
667     else if (pVelocityAttenuationTable[velocity] < 0.0) pVelocityAttenuationTable[velocity] = 0.0;
668     }
669     break;
670     case curve_type_linear:
671     for (int velocity = 0; velocity < 128; velocity++) {
672     pVelocityAttenuationTable[velocity] =
673     GIG_VELOCITY_TRANSFORM_LINEAR((double)velocity,(double)(VelocityResponseDepth+1),(double)VelocityResponseCurveScaling);
674     if (pVelocityAttenuationTable[velocity] > 1.0) pVelocityAttenuationTable[velocity] = 1.0;
675     else if (pVelocityAttenuationTable[velocity] < 0.0) pVelocityAttenuationTable[velocity] = 0.0;
676     }
677     break;
678     case curve_type_special:
679     for (int velocity = 0; velocity < 128; velocity++) {
680     pVelocityAttenuationTable[velocity] =
681     GIG_VELOCITY_TRANSFORM_SPECIAL((double)(velocity+1),(double)(VelocityResponseDepth+1),(double)VelocityResponseCurveScaling);
682     if (pVelocityAttenuationTable[velocity] > 1.0) pVelocityAttenuationTable[velocity] = 1.0;
683     else if (pVelocityAttenuationTable[velocity] < 0.0) pVelocityAttenuationTable[velocity] = 0.0;
684     }
685     break;
686     case curve_type_unknown:
687     default:
688     throw gig::Exception("Unknown transform curve type.");
689     }
690     (*pVelocityTables)[tableKey] = pVelocityAttenuationTable; // put the new table into the tables map
691     }
692 schoenebeck 2 }
693    
694 schoenebeck 16 DimensionRegion::~DimensionRegion() {
695     Instances--;
696     if (!Instances) {
697     // delete the velocity->volume tables
698     VelocityTableMap::iterator iter;
699     for (iter = pVelocityTables->begin(); iter != pVelocityTables->end(); iter++) {
700     double* pTable = iter->second;
701     if (pTable) delete[] pTable;
702     }
703     pVelocityTables->clear();
704     delete pVelocityTables;
705     pVelocityTables = NULL;
706     }
707     }
708 schoenebeck 2
709 schoenebeck 16 /**
710     * Returns the correct amplitude factor for the given \a MIDIKeyVelocity.
711     * All involved parameters (VelocityResponseCurve, VelocityResponseDepth
712     * and VelocityResponseCurveScaling) involved are taken into account to
713     * calculate the amplitude factor. Use this method when a key was
714     * triggered to get the volume with which the sample should be played
715     * back.
716     *
717     * @param MIDI velocity value of the triggered key (between 0 and 127)
718     * @returns amplitude factor (between 0.0 and 1.0)
719     */
720     double DimensionRegion::GetVelocityAttenuation(uint8_t MIDIKeyVelocity) {
721     return pVelocityAttenuationTable[MIDIKeyVelocity];
722     }
723 schoenebeck 2
724 schoenebeck 16
725    
726 schoenebeck 2 // *************** Region ***************
727     // *
728    
729     Region::Region(Instrument* pInstrument, RIFF::List* rgnList) : DLS::Region((DLS::Instrument*) pInstrument, rgnList) {
730     // Initialization
731     Dimensions = 0;
732     for (int i = 0; i < 32; i++) {
733     pDimensionRegions[i] = NULL;
734     }
735    
736     // Actual Loading
737    
738     LoadDimensionRegions(rgnList);
739    
740     RIFF::Chunk* _3lnk = rgnList->GetSubChunk(CHUNK_ID_3LNK);
741     if (_3lnk) {
742     DimensionRegions = _3lnk->ReadUint32();
743     for (int i = 0; i < 5; i++) {
744     dimension_t dimension = static_cast<dimension_t>(_3lnk->ReadUint8());
745     uint8_t bits = _3lnk->ReadUint8();
746     if (dimension == dimension_none) { // inactive dimension
747     pDimensionDefinitions[i].dimension = dimension_none;
748     pDimensionDefinitions[i].bits = 0;
749     pDimensionDefinitions[i].zones = 0;
750     pDimensionDefinitions[i].split_type = split_type_bit;
751     pDimensionDefinitions[i].ranges = NULL;
752     pDimensionDefinitions[i].zone_size = 0;
753     }
754     else { // active dimension
755     pDimensionDefinitions[i].dimension = dimension;
756     pDimensionDefinitions[i].bits = bits;
757     pDimensionDefinitions[i].zones = 0x01 << bits; // = pow(2,bits)
758     pDimensionDefinitions[i].split_type = (dimension == dimension_layer ||
759     dimension == dimension_samplechannel) ? split_type_bit
760     : split_type_normal;
761     pDimensionDefinitions[i].ranges = NULL; // it's not possible to check velocity dimensions for custom defined ranges at this point
762     pDimensionDefinitions[i].zone_size =
763     (pDimensionDefinitions[i].split_type == split_type_normal) ? 128 / pDimensionDefinitions[i].zones
764     : 0;
765     Dimensions++;
766     }
767     _3lnk->SetPos(6, RIFF::stream_curpos); // jump forward to next dimension definition
768     }
769    
770     // check velocity dimension (if there is one) for custom defined zone ranges
771     for (uint i = 0; i < Dimensions; i++) {
772     dimension_def_t* pDimDef = pDimensionDefinitions + i;
773     if (pDimDef->dimension == dimension_velocity) {
774     if (pDimensionRegions[0]->VelocityUpperLimit == 0) {
775     // no custom defined ranges
776     pDimDef->split_type = split_type_normal;
777     pDimDef->ranges = NULL;
778     }
779     else { // custom defined ranges
780     pDimDef->split_type = split_type_customvelocity;
781     pDimDef->ranges = new range_t[pDimDef->zones];
782     unsigned int bits[5] = {0,0,0,0,0};
783     int previousUpperLimit = -1;
784     for (int velocityZone = 0; velocityZone < pDimDef->zones; velocityZone++) {
785     bits[i] = velocityZone;
786     DimensionRegion* pDimRegion = GetDimensionRegionByBit(bits[4],bits[3],bits[2],bits[1],bits[0]);
787    
788     pDimDef->ranges[velocityZone].low = previousUpperLimit + 1;
789     pDimDef->ranges[velocityZone].high = pDimRegion->VelocityUpperLimit;
790     previousUpperLimit = pDimDef->ranges[velocityZone].high;
791     // fill velocity table
792     for (int i = pDimDef->ranges[velocityZone].low; i <= pDimDef->ranges[velocityZone].high; i++) {
793     VelocityTable[i] = velocityZone;
794     }
795     }
796     }
797     }
798     }
799    
800     // load sample references
801     _3lnk->SetPos(44); // jump to start of the wave pool indices (if not already there)
802     for (uint i = 0; i < DimensionRegions; i++) {
803     uint32_t wavepoolindex = _3lnk->ReadUint32();
804     pDimensionRegions[i]->pSample = GetSampleFromWavePool(wavepoolindex);
805     }
806     }
807     else throw gig::Exception("Mandatory <3lnk> chunk not found.");
808     }
809    
810     void Region::LoadDimensionRegions(RIFF::List* rgn) {
811     RIFF::List* _3prg = rgn->GetSubList(LIST_TYPE_3PRG);
812     if (_3prg) {
813     int dimensionRegionNr = 0;
814     RIFF::List* _3ewl = _3prg->GetFirstSubList();
815     while (_3ewl) {
816     if (_3ewl->GetListType() == LIST_TYPE_3EWL) {
817     pDimensionRegions[dimensionRegionNr] = new DimensionRegion(_3ewl);
818     dimensionRegionNr++;
819     }
820     _3ewl = _3prg->GetNextSubList();
821     }
822     if (dimensionRegionNr == 0) throw gig::Exception("No dimension region found.");
823     }
824     }
825    
826     Region::~Region() {
827     for (uint i = 0; i < Dimensions; i++) {
828     if (pDimensionDefinitions[i].ranges) delete[] pDimensionDefinitions[i].ranges;
829     }
830     for (int i = 0; i < 32; i++) {
831     if (pDimensionRegions[i]) delete pDimensionRegions[i];
832     }
833     }
834    
835     /**
836     * Use this method in your audio engine to get the appropriate dimension
837     * region with it's articulation data for the current situation. Just
838     * call the method with the current MIDI controller values and you'll get
839     * the DimensionRegion with the appropriate articulation data for the
840     * current situation (for this Region of course only). To do that you'll
841     * first have to look which dimensions with which controllers and in
842     * which order are defined for this Region when you load the .gig file.
843     * Special cases are e.g. layer or channel dimensions where you just put
844     * in the index numbers instead of a MIDI controller value (means 0 for
845     * left channel, 1 for right channel or 0 for layer 0, 1 for layer 1,
846     * etc.).
847     *
848     * @param Dim4Val MIDI controller value (0-127) for dimension 4
849     * @param Dim3Val MIDI controller value (0-127) for dimension 3
850     * @param Dim2Val MIDI controller value (0-127) for dimension 2
851     * @param Dim1Val MIDI controller value (0-127) for dimension 1
852     * @param Dim0Val MIDI controller value (0-127) for dimension 0
853     * @returns adress to the DimensionRegion for the given situation
854     * @see pDimensionDefinitions
855     * @see Dimensions
856     */
857     DimensionRegion* Region::GetDimensionRegionByValue(uint Dim4Val, uint Dim3Val, uint Dim2Val, uint Dim1Val, uint Dim0Val) {
858     unsigned int bits[5] = {Dim0Val,Dim1Val,Dim2Val,Dim3Val,Dim4Val};
859     for (uint i = 0; i < Dimensions; i++) {
860     switch (pDimensionDefinitions[i].split_type) {
861     case split_type_normal:
862     bits[i] /= pDimensionDefinitions[i].zone_size;
863     break;
864     case split_type_customvelocity:
865     bits[i] = VelocityTable[bits[i]];
866     break;
867     // else the value is already the sought dimension bit number
868     }
869     }
870     return GetDimensionRegionByBit(bits[4],bits[3],bits[2],bits[1],bits[0]);
871     }
872    
873     /**
874     * Returns the appropriate DimensionRegion for the given dimension bit
875     * numbers (zone index). You usually use <i>GetDimensionRegionByValue</i>
876     * instead of calling this method directly!
877     *
878     * @param Dim4Bit Bit number for dimension 4
879     * @param Dim3Bit Bit number for dimension 3
880     * @param Dim2Bit Bit number for dimension 2
881     * @param Dim1Bit Bit number for dimension 1
882     * @param Dim0Bit Bit number for dimension 0
883     * @returns adress to the DimensionRegion for the given dimension
884     * bit numbers
885     * @see GetDimensionRegionByValue()
886     */
887     DimensionRegion* Region::GetDimensionRegionByBit(uint8_t Dim4Bit, uint8_t Dim3Bit, uint8_t Dim2Bit, uint8_t Dim1Bit, uint8_t Dim0Bit) {
888     return *(pDimensionRegions + ((((((((Dim4Bit << pDimensionDefinitions[3].bits) | Dim3Bit)
889     << pDimensionDefinitions[2].bits) | Dim2Bit)
890     << pDimensionDefinitions[1].bits) | Dim1Bit)
891     << pDimensionDefinitions[0].bits) | Dim0Bit) );
892     }
893    
894     /**
895     * Returns pointer address to the Sample referenced with this region.
896     * This is the global Sample for the entire Region (not sure if this is
897     * actually used by the Gigasampler engine - I would only use the Sample
898     * referenced by the appropriate DimensionRegion instead of this sample).
899     *
900     * @returns address to Sample or NULL if there is no reference to a
901     * sample saved in the .gig file
902     */
903     Sample* Region::GetSample() {
904     if (pSample) return static_cast<gig::Sample*>(pSample);
905     else return static_cast<gig::Sample*>(pSample = GetSampleFromWavePool(WavePoolTableIndex));
906     }
907    
908     Sample* Region::GetSampleFromWavePool(unsigned int WavePoolTableIndex) {
909     File* file = (File*) GetParent()->GetParent();
910     unsigned long soughtoffset = file->pWavePoolTable[WavePoolTableIndex];
911     Sample* sample = file->GetFirstSample();
912     while (sample) {
913     if (sample->ulWavePoolOffset == soughtoffset) return static_cast<gig::Sample*>(pSample = sample);
914     sample = file->GetNextSample();
915     }
916     return NULL;
917     }
918    
919    
920    
921     // *************** Instrument ***************
922     // *
923    
924     Instrument::Instrument(File* pFile, RIFF::List* insList) : DLS::Instrument((DLS::File*)pFile, insList) {
925     // Initialization
926     for (int i = 0; i < 128; i++) RegionKeyTable[i] = NULL;
927     RegionIndex = -1;
928    
929     // Loading
930     RIFF::List* lart = insList->GetSubList(LIST_TYPE_LART);
931     if (lart) {
932     RIFF::Chunk* _3ewg = lart->GetSubChunk(CHUNK_ID_3EWG);
933     if (_3ewg) {
934     EffectSend = _3ewg->ReadUint16();
935     Attenuation = _3ewg->ReadInt32();
936     FineTune = _3ewg->ReadInt16();
937     PitchbendRange = _3ewg->ReadInt16();
938     uint8_t dimkeystart = _3ewg->ReadUint8();
939     PianoReleaseMode = dimkeystart & 0x01;
940     DimensionKeyRange.low = dimkeystart >> 1;
941     DimensionKeyRange.high = _3ewg->ReadUint8();
942     }
943     else throw gig::Exception("Mandatory <3ewg> chunk not found.");
944     }
945     else throw gig::Exception("Mandatory <lart> list chunk not found.");
946    
947     RIFF::List* lrgn = insList->GetSubList(LIST_TYPE_LRGN);
948     if (!lrgn) throw gig::Exception("Mandatory chunks in <ins > chunk not found.");
949     pRegions = new Region*[Regions];
950     RIFF::List* rgn = lrgn->GetFirstSubList();
951     unsigned int iRegion = 0;
952     while (rgn) {
953     if (rgn->GetListType() == LIST_TYPE_RGN) {
954     pRegions[iRegion] = new Region(this, rgn);
955     iRegion++;
956     }
957     rgn = lrgn->GetNextSubList();
958     }
959    
960     // Creating Region Key Table for fast lookup
961     for (uint iReg = 0; iReg < Regions; iReg++) {
962     for (int iKey = pRegions[iReg]->KeyRange.low; iKey <= pRegions[iReg]->KeyRange.high; iKey++) {
963     RegionKeyTable[iKey] = pRegions[iReg];
964     }
965     }
966     }
967    
968     Instrument::~Instrument() {
969     for (uint i = 0; i < Regions; i++) {
970     if (pRegions) {
971     if (pRegions[i]) delete (pRegions[i]);
972     }
973     delete[] pRegions;
974     }
975     }
976    
977     /**
978     * Returns the appropriate Region for a triggered note.
979     *
980     * @param Key MIDI Key number of triggered note / key (0 - 127)
981     * @returns pointer adress to the appropriate Region or NULL if there
982     * there is no Region defined for the given \a Key
983     */
984     Region* Instrument::GetRegion(unsigned int Key) {
985     if (!pRegions || Key > 127) return NULL;
986     return RegionKeyTable[Key];
987     /*for (int i = 0; i < Regions; i++) {
988     if (Key <= pRegions[i]->KeyRange.high &&
989     Key >= pRegions[i]->KeyRange.low) return pRegions[i];
990     }
991     return NULL;*/
992     }
993    
994     /**
995     * Returns the first Region of the instrument. You have to call this
996     * method once before you use GetNextRegion().
997     *
998     * @returns pointer address to first region or NULL if there is none
999     * @see GetNextRegion()
1000     */
1001     Region* Instrument::GetFirstRegion() {
1002     if (!Regions) return NULL;
1003     RegionIndex = 1;
1004     return pRegions[0];
1005     }
1006    
1007     /**
1008     * Returns the next Region of the instrument. You have to call
1009     * GetFirstRegion() once before you can use this method. By calling this
1010     * method multiple times it iterates through the available Regions.
1011     *
1012     * @returns pointer address to the next region or NULL if end reached
1013     * @see GetFirstRegion()
1014     */
1015     Region* Instrument::GetNextRegion() {
1016     if (RegionIndex < 0 || RegionIndex >= Regions) return NULL;
1017     return pRegions[RegionIndex++];
1018     }
1019    
1020    
1021    
1022     // *************** File ***************
1023     // *
1024    
1025     File::File(RIFF::File* pRIFF) : DLS::File(pRIFF) {
1026     pSamples = NULL;
1027     pInstruments = NULL;
1028     }
1029    
1030     Sample* File::GetFirstSample() {
1031     if (!pSamples) LoadSamples();
1032     if (!pSamples) return NULL;
1033     SamplesIterator = pSamples->begin();
1034     return static_cast<gig::Sample*>( (SamplesIterator != pSamples->end()) ? *SamplesIterator : NULL );
1035     }
1036    
1037     Sample* File::GetNextSample() {
1038     if (!pSamples) return NULL;
1039     SamplesIterator++;
1040     return static_cast<gig::Sample*>( (SamplesIterator != pSamples->end()) ? *SamplesIterator : NULL );
1041     }
1042    
1043     void File::LoadSamples() {
1044     RIFF::List* wvpl = pRIFF->GetSubList(LIST_TYPE_WVPL);
1045     if (wvpl) {
1046     unsigned long wvplFileOffset = wvpl->GetFilePos();
1047     RIFF::List* wave = wvpl->GetFirstSubList();
1048     while (wave) {
1049     if (wave->GetListType() == LIST_TYPE_WAVE) {
1050     if (!pSamples) pSamples = new SampleList;
1051     unsigned long waveFileOffset = wave->GetFilePos();
1052     pSamples->push_back(new Sample(this, wave, waveFileOffset - wvplFileOffset));
1053     }
1054     wave = wvpl->GetNextSubList();
1055     }
1056     }
1057     else throw gig::Exception("Mandatory <wvpl> chunk not found.");
1058     }
1059    
1060     Instrument* File::GetFirstInstrument() {
1061     if (!pInstruments) LoadInstruments();
1062     if (!pInstruments) return NULL;
1063     InstrumentsIterator = pInstruments->begin();
1064     return (InstrumentsIterator != pInstruments->end()) ? *InstrumentsIterator : NULL;
1065     }
1066    
1067     Instrument* File::GetNextInstrument() {
1068     if (!pInstruments) return NULL;
1069     InstrumentsIterator++;
1070     return (InstrumentsIterator != pInstruments->end()) ? *InstrumentsIterator : NULL;
1071     }
1072    
1073     void File::LoadInstruments() {
1074     RIFF::List* lstInstruments = pRIFF->GetSubList(LIST_TYPE_LINS);
1075     if (lstInstruments) {
1076     RIFF::List* lstInstr = lstInstruments->GetFirstSubList();
1077     while (lstInstr) {
1078     if (lstInstr->GetListType() == LIST_TYPE_INS) {
1079     if (!pInstruments) pInstruments = new InstrumentList;
1080     pInstruments->push_back(new Instrument(this, lstInstr));
1081     }
1082     lstInstr = lstInstruments->GetNextSubList();
1083     }
1084     }
1085     else throw gig::Exception("Mandatory <lins> list chunk not found.");
1086     }
1087    
1088    
1089    
1090     // *************** Exception ***************
1091     // *
1092    
1093     Exception::Exception(String Message) : DLS::Exception(Message) {
1094     }
1095    
1096     void Exception::PrintMessage() {
1097     std::cout << "gig::Exception: " << Message << std::endl;
1098     }
1099    
1100     } // namespace gig

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