/[svn]/linuxsampler/trunk/src/engines/gig/Engine.cpp
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Contents of /linuxsampler/trunk/src/engines/gig/Engine.cpp

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Revision 832 - (show annotations) (download)
Sun Feb 5 10:24:05 2006 UTC (14 years, 6 months ago) by persson
File size: 77438 byte(s)
* added smoothing of volume changes caused by control change messages
* fine tuning of the crossfade volume curve

1 /***************************************************************************
2 * *
3 * LinuxSampler - modular, streaming capable sampler *
4 * *
5 * Copyright (C) 2003, 2004 by Benno Senoner and Christian Schoenebeck *
6 * Copyright (C) 2005, 2006 Christian Schoenebeck *
7 * *
8 * This program 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 program 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 program; 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 <sstream>
25 #include "DiskThread.h"
26 #include "Voice.h"
27 #include "EGADSR.h"
28 #include "../EngineFactory.h"
29
30 #include "Engine.h"
31
32 namespace LinuxSampler { namespace gig {
33
34 InstrumentResourceManager Engine::instruments;
35
36 std::map<AudioOutputDevice*,Engine*> Engine::engines;
37
38 /**
39 * Get a gig::Engine object for the given gig::EngineChannel and the
40 * given AudioOutputDevice. All engine channels which are connected to
41 * the same audio output device will use the same engine instance. This
42 * method will be called by a gig::EngineChannel whenever it's
43 * connecting to a audio output device.
44 *
45 * @param pChannel - engine channel which acquires an engine object
46 * @param pDevice - the audio output device \a pChannel is connected to
47 */
48 Engine* Engine::AcquireEngine(LinuxSampler::gig::EngineChannel* pChannel, AudioOutputDevice* pDevice) {
49 Engine* pEngine = NULL;
50 // check if there's already an engine for the given audio output device
51 if (engines.count(pDevice)) {
52 dmsg(4,("Using existing gig::Engine.\n"));
53 pEngine = engines[pDevice];
54 } else { // create a new engine (and disk thread) instance for the given audio output device
55 dmsg(4,("Creating new gig::Engine.\n"));
56 pEngine = (Engine*) EngineFactory::Create("gig");
57 pEngine->Connect(pDevice);
58 engines[pDevice] = pEngine;
59 }
60 // register engine channel to the engine instance
61 pEngine->engineChannels.add(pChannel);
62 // remember index in the ArrayList
63 pChannel->iEngineIndexSelf = pEngine->engineChannels.size() - 1;
64 dmsg(4,("This gig::Engine has now %d EngineChannels.\n",pEngine->engineChannels.size()));
65 return pEngine;
66 }
67
68 /**
69 * Once an engine channel is disconnected from an audio output device,
70 * it wil immediately call this method to unregister itself from the
71 * engine instance and if that engine instance is not used by any other
72 * engine channel anymore, then that engine instance will be destroyed.
73 *
74 * @param pChannel - engine channel which wants to disconnect from it's
75 * engine instance
76 * @param pDevice - audio output device \a pChannel was connected to
77 */
78 void Engine::FreeEngine(LinuxSampler::gig::EngineChannel* pChannel, AudioOutputDevice* pDevice) {
79 dmsg(4,("Disconnecting EngineChannel from gig::Engine.\n"));
80 Engine* pEngine = engines[pDevice];
81 // unregister EngineChannel from the Engine instance
82 pEngine->engineChannels.remove(pChannel);
83 // if the used Engine instance is not used anymore, then destroy it
84 if (pEngine->engineChannels.empty()) {
85 pDevice->Disconnect(pEngine);
86 engines.erase(pDevice);
87 delete pEngine;
88 dmsg(4,("Destroying gig::Engine.\n"));
89 }
90 else dmsg(4,("This gig::Engine has now %d EngineChannels.\n",pEngine->engineChannels.size()));
91 }
92
93 /**
94 * Constructor
95 */
96 Engine::Engine() {
97 pAudioOutputDevice = NULL;
98 pDiskThread = NULL;
99 pEventGenerator = NULL;
100 pSysexBuffer = new RingBuffer<uint8_t>(CONFIG_SYSEX_BUFFER_SIZE, 0);
101 pEventQueue = new RingBuffer<Event>(CONFIG_MAX_EVENTS_PER_FRAGMENT, 0);
102 pEventPool = new Pool<Event>(CONFIG_MAX_EVENTS_PER_FRAGMENT);
103 pVoicePool = new Pool<Voice>(CONFIG_MAX_VOICES);
104 pVoiceStealingQueue = new RTList<Event>(pEventPool);
105 pGlobalEvents = new RTList<Event>(pEventPool);
106 for (RTList<Voice>::Iterator iterVoice = pVoicePool->allocAppend(); iterVoice == pVoicePool->last(); iterVoice = pVoicePool->allocAppend()) {
107 iterVoice->SetEngine(this);
108 }
109 pVoicePool->clear();
110
111 ResetInternal();
112 ResetScaleTuning();
113 }
114
115 /**
116 * Destructor
117 */
118 Engine::~Engine() {
119 if (pDiskThread) {
120 dmsg(1,("Stopping disk thread..."));
121 pDiskThread->StopThread();
122 delete pDiskThread;
123 dmsg(1,("OK\n"));
124 }
125 if (pEventQueue) delete pEventQueue;
126 if (pEventPool) delete pEventPool;
127 if (pVoicePool) {
128 pVoicePool->clear();
129 delete pVoicePool;
130 }
131 if (pEventGenerator) delete pEventGenerator;
132 if (pVoiceStealingQueue) delete pVoiceStealingQueue;
133 if (pSysexBuffer) delete pSysexBuffer;
134 EngineFactory::Destroy(this);
135 }
136
137 void Engine::Enable() {
138 dmsg(3,("gig::Engine: enabling\n"));
139 EngineDisabled.PushAndUnlock(false, 2); // set condition object 'EngineDisabled' to false (wait max. 2s)
140 dmsg(3,("gig::Engine: enabled (val=%d)\n", EngineDisabled.GetUnsafe()));
141 }
142
143 void Engine::Disable() {
144 dmsg(3,("gig::Engine: disabling\n"));
145 bool* pWasDisabled = EngineDisabled.PushAndUnlock(true, 2); // wait max. 2s
146 if (!pWasDisabled) dmsg(3,("gig::Engine warning: Timeout waiting to disable engine.\n"));
147 }
148
149 void Engine::DisableAndLock() {
150 dmsg(3,("gig::Engine: disabling\n"));
151 bool* pWasDisabled = EngineDisabled.Push(true, 2); // wait max. 2s
152 if (!pWasDisabled) dmsg(3,("gig::Engine warning: Timeout waiting to disable engine.\n"));
153 }
154
155 /**
156 * Reset all voices and disk thread and clear input event queue and all
157 * control and status variables.
158 */
159 void Engine::Reset() {
160 DisableAndLock();
161 ResetInternal();
162 ResetScaleTuning();
163 Enable();
164 }
165
166 /**
167 * Reset all voices and disk thread and clear input event queue and all
168 * control and status variables. This method is not thread safe!
169 */
170 void Engine::ResetInternal() {
171 ActiveVoiceCount = 0;
172 ActiveVoiceCountMax = 0;
173
174 // reset voice stealing parameters
175 pVoiceStealingQueue->clear();
176 itLastStolenVoice = RTList<Voice>::Iterator();
177 itLastStolenVoiceGlobally = RTList<Voice>::Iterator();
178 iuiLastStolenKey = RTList<uint>::Iterator();
179 iuiLastStolenKeyGlobally = RTList<uint>::Iterator();
180 pLastStolenChannel = NULL;
181
182 // reset all voices
183 for (RTList<Voice>::Iterator iterVoice = pVoicePool->allocAppend(); iterVoice == pVoicePool->last(); iterVoice = pVoicePool->allocAppend()) {
184 iterVoice->Reset();
185 }
186 pVoicePool->clear();
187
188 // reset disk thread
189 if (pDiskThread) pDiskThread->Reset();
190
191 // delete all input events
192 pEventQueue->init();
193 pSysexBuffer->init();
194 }
195
196 /**
197 * Reset to normal, chromatic scale (means equal tempered).
198 */
199 void Engine::ResetScaleTuning() {
200 memset(&ScaleTuning[0], 0x00, 12);
201 }
202
203 /**
204 * Connect this engine instance with the given audio output device.
205 * This method will be called when an Engine instance is created.
206 * All of the engine's data structures which are dependant to the used
207 * audio output device / driver will be (re)allocated and / or
208 * adjusted appropriately.
209 *
210 * @param pAudioOut - audio output device to connect to
211 */
212 void Engine::Connect(AudioOutputDevice* pAudioOut) {
213 pAudioOutputDevice = pAudioOut;
214
215 ResetInternal();
216
217 // inform audio driver for the need of two channels
218 try {
219 pAudioOutputDevice->AcquireChannels(2); // gig engine only stereo
220 }
221 catch (AudioOutputException e) {
222 String msg = "Audio output device unable to provide 2 audio channels, cause: " + e.Message();
223 throw LinuxSamplerException(msg);
224 }
225
226 this->MaxSamplesPerCycle = pAudioOutputDevice->MaxSamplesPerCycle();
227 this->SampleRate = pAudioOutputDevice->SampleRate();
228
229 // FIXME: audio drivers with varying fragment sizes might be a problem here
230 MaxFadeOutPos = MaxSamplesPerCycle - int(double(SampleRate) * CONFIG_EG_MIN_RELEASE_TIME) - 1;
231 if (MaxFadeOutPos < 0) {
232 std::cerr << "gig::Engine: WARNING, CONFIG_EG_MIN_RELEASE_TIME "
233 << "too big for current audio fragment size & sampling rate! "
234 << "May lead to click sounds if voice stealing chimes in!\n" << std::flush;
235 // force volume ramp downs at the beginning of each fragment
236 MaxFadeOutPos = 0;
237 // lower minimum release time
238 const float minReleaseTime = (float) MaxSamplesPerCycle / (float) SampleRate;
239 for (RTList<Voice>::Iterator iterVoice = pVoicePool->allocAppend(); iterVoice == pVoicePool->last(); iterVoice = pVoicePool->allocAppend()) {
240 iterVoice->EG1.CalculateFadeOutCoeff(minReleaseTime, SampleRate);
241 }
242 pVoicePool->clear();
243 }
244
245 // (re)create disk thread
246 if (this->pDiskThread) {
247 dmsg(1,("Stopping disk thread..."));
248 this->pDiskThread->StopThread();
249 delete this->pDiskThread;
250 dmsg(1,("OK\n"));
251 }
252 this->pDiskThread = new DiskThread(((pAudioOut->MaxSamplesPerCycle() << CONFIG_MAX_PITCH) << 1) + 6); //FIXME: assuming stereo
253 if (!pDiskThread) {
254 dmsg(0,("gig::Engine new diskthread = NULL\n"));
255 exit(EXIT_FAILURE);
256 }
257
258 for (RTList<Voice>::Iterator iterVoice = pVoicePool->allocAppend(); iterVoice == pVoicePool->last(); iterVoice = pVoicePool->allocAppend()) {
259 iterVoice->pDiskThread = this->pDiskThread;
260 dmsg(3,("d"));
261 }
262 pVoicePool->clear();
263
264 // (re)create event generator
265 if (pEventGenerator) delete pEventGenerator;
266 pEventGenerator = new EventGenerator(pAudioOut->SampleRate());
267
268 dmsg(1,("Starting disk thread..."));
269 pDiskThread->StartThread();
270 dmsg(1,("OK\n"));
271
272 for (RTList<Voice>::Iterator iterVoice = pVoicePool->allocAppend(); iterVoice == pVoicePool->last(); iterVoice = pVoicePool->allocAppend()) {
273 if (!iterVoice->pDiskThread) {
274 dmsg(0,("Engine -> voice::trigger: !pDiskThread\n"));
275 exit(EXIT_FAILURE);
276 }
277 }
278 }
279
280 /**
281 * Clear all engine global event lists.
282 */
283 void Engine::ClearEventLists() {
284 pGlobalEvents->clear();
285 }
286
287 /**
288 * Copy all events from the engine's global input queue buffer to the
289 * engine's internal event list. This will be done at the beginning of
290 * each audio cycle (that is each RenderAudio() call) to distinguish
291 * all global events which have to be processed in the current audio
292 * cycle. These events are usually just SysEx messages. Every
293 * EngineChannel has it's own input event queue buffer and event list
294 * to handle common events like NoteOn, NoteOff and ControlChange
295 * events.
296 *
297 * @param Samples - number of sample points to be processed in the
298 * current audio cycle
299 */
300 void Engine::ImportEvents(uint Samples) {
301 RingBuffer<Event>::NonVolatileReader eventQueueReader = pEventQueue->get_non_volatile_reader();
302 Event* pEvent;
303 while (true) {
304 // get next event from input event queue
305 if (!(pEvent = eventQueueReader.pop())) break;
306 // if younger event reached, ignore that and all subsequent ones for now
307 if (pEvent->FragmentPos() >= Samples) {
308 eventQueueReader--;
309 dmsg(2,("Younger Event, pos=%d ,Samples=%d!\n",pEvent->FragmentPos(),Samples));
310 pEvent->ResetFragmentPos();
311 break;
312 }
313 // copy event to internal event list
314 if (pGlobalEvents->poolIsEmpty()) {
315 dmsg(1,("Event pool emtpy!\n"));
316 break;
317 }
318 *pGlobalEvents->allocAppend() = *pEvent;
319 }
320 eventQueueReader.free(); // free all copied events from input queue
321 }
322
323 /**
324 * Let this engine proceed to render the given amount of sample points. The
325 * calculated audio data of all voices of this engine will be placed into
326 * the engine's audio sum buffer which has to be copied and eventually be
327 * converted to the appropriate value range by the audio output class (e.g.
328 * AlsaIO or JackIO) right after.
329 *
330 * @param Samples - number of sample points to be rendered
331 * @returns 0 on success
332 */
333 int Engine::RenderAudio(uint Samples) {
334 dmsg(5,("RenderAudio(Samples=%d)\n", Samples));
335
336 // return if engine disabled
337 if (EngineDisabled.Pop()) {
338 dmsg(5,("gig::Engine: engine disabled (val=%d)\n",EngineDisabled.GetUnsafe()));
339 return 0;
340 }
341
342 // update time of start and end of this audio fragment (as events' time stamps relate to this)
343 pEventGenerator->UpdateFragmentTime(Samples);
344
345 // We only allow a maximum of CONFIG_MAX_VOICES voices to be spawned
346 // in each audio fragment. All subsequent request for spawning new
347 // voices in the same audio fragment will be ignored.
348 VoiceSpawnsLeft = CONFIG_MAX_VOICES;
349
350 // get all events from the engine's global input event queue which belong to the current fragment
351 // (these are usually just SysEx messages)
352 ImportEvents(Samples);
353
354 // process engine global events (these are currently only MIDI System Exclusive messages)
355 {
356 RTList<Event>::Iterator itEvent = pGlobalEvents->first();
357 RTList<Event>::Iterator end = pGlobalEvents->end();
358 for (; itEvent != end; ++itEvent) {
359 switch (itEvent->Type) {
360 case Event::type_sysex:
361 dmsg(5,("Engine: Sysex received\n"));
362 ProcessSysex(itEvent);
363 break;
364 }
365 }
366 }
367
368 // reset internal voice counter (just for statistic of active voices)
369 ActiveVoiceCountTemp = 0;
370
371 // handle events on all engine channels
372 for (int i = 0; i < engineChannels.size(); i++) {
373 if (!engineChannels[i]->pInstrument) continue; // ignore if no instrument loaded
374 ProcessEvents(engineChannels[i], Samples);
375 }
376
377 // render all 'normal', active voices on all engine channels
378 for (int i = 0; i < engineChannels.size(); i++) {
379 if (!engineChannels[i]->pInstrument) continue; // ignore if no instrument loaded
380 RenderActiveVoices(engineChannels[i], Samples);
381 }
382
383 // now that all ordinary voices on ALL engine channels are rendered, render new stolen voices
384 RenderStolenVoices(Samples);
385
386 // handle cleanup on all engine channels for the next audio fragment
387 for (int i = 0; i < engineChannels.size(); i++) {
388 if (!engineChannels[i]->pInstrument) continue; // ignore if no instrument loaded
389 PostProcess(engineChannels[i]);
390 }
391
392
393 // empty the engine's event list for the next audio fragment
394 ClearEventLists();
395
396 // reset voice stealing for the next audio fragment
397 pVoiceStealingQueue->clear();
398
399 // just some statistics about this engine instance
400 ActiveVoiceCount = ActiveVoiceCountTemp;
401 if (ActiveVoiceCount > ActiveVoiceCountMax) ActiveVoiceCountMax = ActiveVoiceCount;
402
403 FrameTime += Samples;
404
405 return 0;
406 }
407
408 /**
409 * Dispatch and handle all events in this audio fragment for the given
410 * engine channel.
411 *
412 * @param pEngineChannel - engine channel on which events should be
413 * processed
414 * @param Samples - amount of sample points to be processed in
415 * this audio fragment cycle
416 */
417 void Engine::ProcessEvents(EngineChannel* pEngineChannel, uint Samples) {
418 // get all events from the engine channels's input event queue which belong to the current fragment
419 // (these are the common events like NoteOn, NoteOff, ControlChange, etc.)
420 pEngineChannel->ImportEvents(Samples);
421
422 // process events
423 {
424 RTList<Event>::Iterator itEvent = pEngineChannel->pEvents->first();
425 RTList<Event>::Iterator end = pEngineChannel->pEvents->end();
426 for (; itEvent != end; ++itEvent) {
427 switch (itEvent->Type) {
428 case Event::type_note_on:
429 dmsg(5,("Engine: Note on received\n"));
430 ProcessNoteOn((EngineChannel*)itEvent->pEngineChannel, itEvent);
431 break;
432 case Event::type_note_off:
433 dmsg(5,("Engine: Note off received\n"));
434 ProcessNoteOff((EngineChannel*)itEvent->pEngineChannel, itEvent);
435 break;
436 case Event::type_control_change:
437 dmsg(5,("Engine: MIDI CC received\n"));
438 ProcessControlChange((EngineChannel*)itEvent->pEngineChannel, itEvent);
439 break;
440 case Event::type_pitchbend:
441 dmsg(5,("Engine: Pitchbend received\n"));
442 ProcessPitchbend((EngineChannel*)itEvent->pEngineChannel, itEvent);
443 break;
444 }
445 }
446 }
447
448 // reset voice stealing for the next engine channel (or next audio fragment)
449 itLastStolenVoice = RTList<Voice>::Iterator();
450 itLastStolenVoiceGlobally = RTList<Voice>::Iterator();
451 iuiLastStolenKey = RTList<uint>::Iterator();
452 iuiLastStolenKeyGlobally = RTList<uint>::Iterator();
453 pLastStolenChannel = NULL;
454 }
455
456 /**
457 * Render all 'normal' voices (that is voices which were not stolen in
458 * this fragment) on the given engine channel.
459 *
460 * @param pEngineChannel - engine channel on which audio should be
461 * rendered
462 * @param Samples - amount of sample points to be rendered in
463 * this audio fragment cycle
464 */
465 void Engine::RenderActiveVoices(EngineChannel* pEngineChannel, uint Samples) {
466 #if !CONFIG_PROCESS_MUTED_CHANNELS
467 if (pEngineChannel->GetMute()) return; // skip if sampler channel is muted
468 #endif
469
470 RTList<uint>::Iterator iuiKey = pEngineChannel->pActiveKeys->first();
471 RTList<uint>::Iterator end = pEngineChannel->pActiveKeys->end();
472 while (iuiKey != end) { // iterate through all active keys
473 midi_key_info_t* pKey = &pEngineChannel->pMIDIKeyInfo[*iuiKey];
474 ++iuiKey;
475
476 RTList<Voice>::Iterator itVoice = pKey->pActiveVoices->first();
477 RTList<Voice>::Iterator itVoicesEnd = pKey->pActiveVoices->end();
478 for (; itVoice != itVoicesEnd; ++itVoice) { // iterate through all voices on this key
479 // now render current voice
480 itVoice->Render(Samples);
481 if (itVoice->IsActive()) ActiveVoiceCountTemp++; // still active
482 else { // voice reached end, is now inactive
483 FreeVoice(pEngineChannel, itVoice); // remove voice from the list of active voices
484 }
485 }
486 }
487 }
488
489 /**
490 * Render all stolen voices (only voices which were stolen in this
491 * fragment) on the given engine channel. Stolen voices are rendered
492 * after all normal voices have been rendered; this is needed to render
493 * audio of those voices which were selected for voice stealing until
494 * the point were the stealing (that is the take over of the voice)
495 * actually happened.
496 *
497 * @param pEngineChannel - engine channel on which audio should be
498 * rendered
499 * @param Samples - amount of sample points to be rendered in
500 * this audio fragment cycle
501 */
502 void Engine::RenderStolenVoices(uint Samples) {
503 RTList<Event>::Iterator itVoiceStealEvent = pVoiceStealingQueue->first();
504 RTList<Event>::Iterator end = pVoiceStealingQueue->end();
505 for (; itVoiceStealEvent != end; ++itVoiceStealEvent) {
506 EngineChannel* pEngineChannel = (EngineChannel*) itVoiceStealEvent->pEngineChannel;
507 Pool<Voice>::Iterator itNewVoice =
508 LaunchVoice(pEngineChannel, itVoiceStealEvent, itVoiceStealEvent->Param.Note.Layer, itVoiceStealEvent->Param.Note.ReleaseTrigger, false, false);
509 if (itNewVoice) {
510 itNewVoice->Render(Samples);
511 if (itNewVoice->IsActive()) ActiveVoiceCountTemp++; // still active
512 else { // voice reached end, is now inactive
513 FreeVoice(pEngineChannel, itNewVoice); // remove voice from the list of active voices
514 }
515 }
516 else dmsg(1,("gig::Engine: ERROR, voice stealing didn't work out!\n"));
517
518 // we need to clear the key's event list explicitly here in case key was never active
519 midi_key_info_t* pKey = &pEngineChannel->pMIDIKeyInfo[itVoiceStealEvent->Param.Note.Key];
520 pKey->VoiceTheftsQueued--;
521 if (!pKey->Active && !pKey->VoiceTheftsQueued) pKey->pEvents->clear();
522 }
523 }
524
525 /**
526 * Free all keys which have turned inactive in this audio fragment, from
527 * the list of active keys and clear all event lists on that engine
528 * channel.
529 *
530 * @param pEngineChannel - engine channel to cleanup
531 */
532 void Engine::PostProcess(EngineChannel* pEngineChannel) {
533 // free all keys which have no active voices left
534 {
535 RTList<uint>::Iterator iuiKey = pEngineChannel->pActiveKeys->first();
536 RTList<uint>::Iterator end = pEngineChannel->pActiveKeys->end();
537 while (iuiKey != end) { // iterate through all active keys
538 midi_key_info_t* pKey = &pEngineChannel->pMIDIKeyInfo[*iuiKey];
539 ++iuiKey;
540 if (pKey->pActiveVoices->isEmpty()) FreeKey(pEngineChannel, pKey);
541 #if CONFIG_DEVMODE
542 else { // just a sanity check for debugging
543 RTList<Voice>::Iterator itVoice = pKey->pActiveVoices->first();
544 RTList<Voice>::Iterator itVoicesEnd = pKey->pActiveVoices->end();
545 for (; itVoice != itVoicesEnd; ++itVoice) { // iterate through all voices on this key
546 if (itVoice->itKillEvent) {
547 dmsg(1,("gig::Engine: ERROR, killed voice survived !!!\n"));
548 }
549 }
550 }
551 #endif // CONFIG_DEVMODE
552 }
553 }
554
555 // empty the engine channel's own event lists
556 pEngineChannel->ClearEventLists();
557 }
558
559 /**
560 * Will be called by the MIDI input device whenever a MIDI system
561 * exclusive message has arrived.
562 *
563 * @param pData - pointer to sysex data
564 * @param Size - lenght of sysex data (in bytes)
565 */
566 void Engine::SendSysex(void* pData, uint Size) {
567 Event event = pEventGenerator->CreateEvent();
568 event.Type = Event::type_sysex;
569 event.Param.Sysex.Size = Size;
570 event.pEngineChannel = NULL; // as Engine global event
571 if (pEventQueue->write_space() > 0) {
572 if (pSysexBuffer->write_space() >= Size) {
573 // copy sysex data to input buffer
574 uint toWrite = Size;
575 uint8_t* pPos = (uint8_t*) pData;
576 while (toWrite) {
577 const uint writeNow = RTMath::Min(toWrite, pSysexBuffer->write_space_to_end());
578 pSysexBuffer->write(pPos, writeNow);
579 toWrite -= writeNow;
580 pPos += writeNow;
581
582 }
583 // finally place sysex event into input event queue
584 pEventQueue->push(&event);
585 }
586 else dmsg(1,("Engine: Sysex message too large (%d byte) for input buffer (%d byte)!",Size,CONFIG_SYSEX_BUFFER_SIZE));
587 }
588 else dmsg(1,("Engine: Input event queue full!"));
589 }
590
591 /**
592 * Assigns and triggers a new voice for the respective MIDI key.
593 *
594 * @param pEngineChannel - engine channel on which this event occured on
595 * @param itNoteOnEvent - key, velocity and time stamp of the event
596 */
597 void Engine::ProcessNoteOn(EngineChannel* pEngineChannel, Pool<Event>::Iterator& itNoteOnEvent) {
598 #if !CONFIG_PROCESS_MUTED_CHANNELS
599 if (pEngineChannel->GetMute()) return; // skip if sampler channel is muted
600 #endif
601
602 const int key = itNoteOnEvent->Param.Note.Key;
603 midi_key_info_t* pKey = &pEngineChannel->pMIDIKeyInfo[key];
604
605 // move note on event to the key's own event list
606 RTList<Event>::Iterator itNoteOnEventOnKeyList = itNoteOnEvent.moveToEndOf(pKey->pEvents);
607
608 // if Solo Mode then kill all already active voices
609 if (pEngineChannel->SoloMode) {
610 Pool<uint>::Iterator itYoungestKey = pEngineChannel->pActiveKeys->last();
611 if (itYoungestKey) {
612 const int iYoungestKey = *itYoungestKey;
613 const midi_key_info_t* pOtherKey = &pEngineChannel->pMIDIKeyInfo[iYoungestKey];
614 if (pOtherKey->Active) {
615 // get final portamento position of currently active voice
616 if (pEngineChannel->PortamentoMode) {
617 RTList<Voice>::Iterator itVoice = pOtherKey->pActiveVoices->last();
618 if (itVoice) itVoice->UpdatePortamentoPos(itNoteOnEventOnKeyList);
619 }
620 // kill all voices on the (other) key
621 RTList<Voice>::Iterator itVoiceToBeKilled = pOtherKey->pActiveVoices->first();
622 RTList<Voice>::Iterator end = pOtherKey->pActiveVoices->end();
623 for (; itVoiceToBeKilled != end; ++itVoiceToBeKilled) {
624 if (itVoiceToBeKilled->Type != Voice::type_release_trigger)
625 itVoiceToBeKilled->Kill(itNoteOnEventOnKeyList);
626 }
627 }
628 }
629 // set this key as 'currently active solo key'
630 pEngineChannel->SoloKey = key;
631 }
632
633 // Change key dimension value if key is in keyswitching area
634 {
635 const ::gig::Instrument* pInstrument = pEngineChannel->pInstrument;
636 if (key >= pInstrument->DimensionKeyRange.low && key <= pInstrument->DimensionKeyRange.high)
637 pEngineChannel->CurrentKeyDimension = ((key - pInstrument->DimensionKeyRange.low) * 128) /
638 (pInstrument->DimensionKeyRange.high - pInstrument->DimensionKeyRange.low + 1);
639 }
640
641 pKey->KeyPressed = true; // the MIDI key was now pressed down
642 pKey->Velocity = itNoteOnEventOnKeyList->Param.Note.Velocity;
643 pKey->NoteOnTime = FrameTime + itNoteOnEventOnKeyList->FragmentPos(); // will be used to calculate note length
644
645 // cancel release process of voices on this key if needed
646 if (pKey->Active && !pEngineChannel->SustainPedal) {
647 RTList<Event>::Iterator itCancelReleaseEvent = pKey->pEvents->allocAppend();
648 if (itCancelReleaseEvent) {
649 *itCancelReleaseEvent = *itNoteOnEventOnKeyList; // copy event
650 itCancelReleaseEvent->Type = Event::type_cancel_release; // transform event type
651 }
652 else dmsg(1,("Event pool emtpy!\n"));
653 }
654
655 // allocate and trigger new voice(s) for the key
656 {
657 // first, get total amount of required voices (dependant on amount of layers)
658 ::gig::Region* pRegion = pEngineChannel->pInstrument->GetRegion(itNoteOnEventOnKeyList->Param.Note.Key);
659 if (pRegion) {
660 int voicesRequired = pRegion->Layers;
661 // now launch the required amount of voices
662 for (int i = 0; i < voicesRequired; i++)
663 LaunchVoice(pEngineChannel, itNoteOnEventOnKeyList, i, false, true, true);
664 }
665 }
666
667 // if neither a voice was spawned or postponed then remove note on event from key again
668 if (!pKey->Active && !pKey->VoiceTheftsQueued)
669 pKey->pEvents->free(itNoteOnEventOnKeyList);
670
671 if (!pEngineChannel->SoloMode || pEngineChannel->PortamentoPos < 0.0f) pEngineChannel->PortamentoPos = (float) key;
672 pKey->RoundRobinIndex++;
673 }
674
675 /**
676 * Releases the voices on the given key if sustain pedal is not pressed.
677 * If sustain is pressed, the release of the note will be postponed until
678 * sustain pedal will be released or voice turned inactive by itself (e.g.
679 * due to completion of sample playback).
680 *
681 * @param pEngineChannel - engine channel on which this event occured on
682 * @param itNoteOffEvent - key, velocity and time stamp of the event
683 */
684 void Engine::ProcessNoteOff(EngineChannel* pEngineChannel, Pool<Event>::Iterator& itNoteOffEvent) {
685 #if !CONFIG_PROCESS_MUTED_CHANNELS
686 if (pEngineChannel->GetMute()) return; // skip if sampler channel is muted
687 #endif
688
689 const int iKey = itNoteOffEvent->Param.Note.Key;
690 midi_key_info_t* pKey = &pEngineChannel->pMIDIKeyInfo[iKey];
691 pKey->KeyPressed = false; // the MIDI key was now released
692
693 // move event to the key's own event list
694 RTList<Event>::Iterator itNoteOffEventOnKeyList = itNoteOffEvent.moveToEndOf(pKey->pEvents);
695
696 bool bShouldRelease = pKey->Active && ShouldReleaseVoice(pEngineChannel, itNoteOffEventOnKeyList->Param.Note.Key);
697
698 // in case Solo Mode is enabled, kill all voices on this key and respawn a voice on the highest pressed key (if any)
699 if (pEngineChannel->SoloMode) { //TODO: this feels like too much code just for handling solo mode :P
700 bool bOtherKeysPressed = false;
701 if (iKey == pEngineChannel->SoloKey) {
702 pEngineChannel->SoloKey = -1;
703 // if there's still a key pressed down, respawn a voice (group) on the highest key
704 for (int i = 127; i > 0; i--) {
705 midi_key_info_t* pOtherKey = &pEngineChannel->pMIDIKeyInfo[i];
706 if (pOtherKey->KeyPressed) {
707 bOtherKeysPressed = true;
708 // make the other key the new 'currently active solo key'
709 pEngineChannel->SoloKey = i;
710 // get final portamento position of currently active voice
711 if (pEngineChannel->PortamentoMode) {
712 RTList<Voice>::Iterator itVoice = pKey->pActiveVoices->first();
713 if (itVoice) itVoice->UpdatePortamentoPos(itNoteOffEventOnKeyList);
714 }
715 // create a pseudo note on event
716 RTList<Event>::Iterator itPseudoNoteOnEvent = pOtherKey->pEvents->allocAppend();
717 if (itPseudoNoteOnEvent) {
718 // copy event
719 *itPseudoNoteOnEvent = *itNoteOffEventOnKeyList;
720 // transform event to a note on event
721 itPseudoNoteOnEvent->Type = Event::type_note_on;
722 itPseudoNoteOnEvent->Param.Note.Key = i;
723 itPseudoNoteOnEvent->Param.Note.Velocity = pOtherKey->Velocity;
724 // allocate and trigger new voice(s) for the other key
725 {
726 // first, get total amount of required voices (dependant on amount of layers)
727 ::gig::Region* pRegion = pEngineChannel->pInstrument->GetRegion(i);
728 if (pRegion) {
729 int voicesRequired = pRegion->Layers;
730 // now launch the required amount of voices
731 for (int iLayer = 0; iLayer < voicesRequired; iLayer++)
732 LaunchVoice(pEngineChannel, itPseudoNoteOnEvent, iLayer, false, true, false);
733 }
734 }
735 // if neither a voice was spawned or postponed then remove note on event from key again
736 if (!pOtherKey->Active && !pOtherKey->VoiceTheftsQueued)
737 pOtherKey->pEvents->free(itPseudoNoteOnEvent);
738
739 } else dmsg(1,("Could not respawn voice, no free event left\n"));
740 break; // done
741 }
742 }
743 }
744 if (bOtherKeysPressed) {
745 if (pKey->Active) { // kill all voices on this key
746 bShouldRelease = false; // no need to release, as we kill it here
747 RTList<Voice>::Iterator itVoiceToBeKilled = pKey->pActiveVoices->first();
748 RTList<Voice>::Iterator end = pKey->pActiveVoices->end();
749 for (; itVoiceToBeKilled != end; ++itVoiceToBeKilled) {
750 if (itVoiceToBeKilled->Type != Voice::type_release_trigger)
751 itVoiceToBeKilled->Kill(itNoteOffEventOnKeyList);
752 }
753 }
754 } else pEngineChannel->PortamentoPos = -1.0f;
755 }
756
757 // if no solo mode (the usual case) or if solo mode and no other key pressed, then release voices on this key if needed
758 if (bShouldRelease) {
759 itNoteOffEventOnKeyList->Type = Event::type_release; // transform event type
760
761 // spawn release triggered voice(s) if needed
762 if (pKey->ReleaseTrigger) {
763 // first, get total amount of required voices (dependant on amount of layers)
764 ::gig::Region* pRegion = pEngineChannel->pInstrument->GetRegion(itNoteOffEventOnKeyList->Param.Note.Key);
765 if (pRegion) {
766 int voicesRequired = pRegion->Layers;
767
768 // MIDI note-on velocity is used instead of note-off velocity
769 itNoteOffEventOnKeyList->Param.Note.Velocity = pKey->Velocity;
770
771 // now launch the required amount of voices
772 for (int i = 0; i < voicesRequired; i++)
773 LaunchVoice(pEngineChannel, itNoteOffEventOnKeyList, i, true, false, false); //FIXME: for the moment we don't perform voice stealing for release triggered samples
774 }
775 pKey->ReleaseTrigger = false;
776 }
777 }
778
779 // if neither a voice was spawned or postponed on this key then remove note off event from key again
780 if (!pKey->Active && !pKey->VoiceTheftsQueued)
781 pKey->pEvents->free(itNoteOffEventOnKeyList);
782 }
783
784 /**
785 * Moves pitchbend event from the general (input) event list to the engine
786 * channel's event list. It will actually processed later by the
787 * respective voice.
788 *
789 * @param pEngineChannel - engine channel on which this event occured on
790 * @param itPitchbendEvent - absolute pitch value and time stamp of the event
791 */
792 void Engine::ProcessPitchbend(EngineChannel* pEngineChannel, Pool<Event>::Iterator& itPitchbendEvent) {
793 pEngineChannel->Pitch = itPitchbendEvent->Param.Pitch.Pitch; // store current pitch value
794 }
795
796 /**
797 * Allocates and triggers a new voice. This method will usually be
798 * called by the ProcessNoteOn() method and by the voices itself
799 * (e.g. to spawn further voices on the same key for layered sounds).
800 *
801 * @param pEngineChannel - engine channel on which this event occured on
802 * @param itNoteOnEvent - key, velocity and time stamp of the event
803 * @param iLayer - layer index for the new voice (optional - only
804 * in case of layered sounds of course)
805 * @param ReleaseTriggerVoice - if new voice is a release triggered voice
806 * (optional, default = false)
807 * @param VoiceStealing - if voice stealing should be performed
808 * when there is no free voice
809 * (optional, default = true)
810 * @param HandleKeyGroupConflicts - if voices should be killed due to a
811 * key group conflict
812 * @returns pointer to new voice or NULL if there was no free voice or
813 * if the voice wasn't triggered (for example when no region is
814 * defined for the given key).
815 */
816 Pool<Voice>::Iterator Engine::LaunchVoice(EngineChannel* pEngineChannel, Pool<Event>::Iterator& itNoteOnEvent, int iLayer, bool ReleaseTriggerVoice, bool VoiceStealing, bool HandleKeyGroupConflicts) {
817 int MIDIKey = itNoteOnEvent->Param.Note.Key;
818 midi_key_info_t* pKey = &pEngineChannel->pMIDIKeyInfo[MIDIKey];
819 ::gig::Region* pRegion = pEngineChannel->pInstrument->GetRegion(MIDIKey);
820
821 // if nothing defined for this key
822 if (!pRegion) return Pool<Voice>::Iterator(); // nothing to do
823
824 // only mark the first voice of a layered voice (group) to be in a
825 // key group, so the layered voices won't kill each other
826 int iKeyGroup = (iLayer == 0 && !ReleaseTriggerVoice) ? pRegion->KeyGroup : 0;
827
828 // handle key group (a.k.a. exclusive group) conflicts
829 if (HandleKeyGroupConflicts) {
830 if (iKeyGroup) { // if this voice / key belongs to a key group
831 uint** ppKeyGroup = &pEngineChannel->ActiveKeyGroups[iKeyGroup];
832 if (*ppKeyGroup) { // if there's already an active key in that key group
833 midi_key_info_t* pOtherKey = &pEngineChannel->pMIDIKeyInfo[**ppKeyGroup];
834 // kill all voices on the (other) key
835 RTList<Voice>::Iterator itVoiceToBeKilled = pOtherKey->pActiveVoices->first();
836 RTList<Voice>::Iterator end = pOtherKey->pActiveVoices->end();
837 for (; itVoiceToBeKilled != end; ++itVoiceToBeKilled) {
838 if (itVoiceToBeKilled->Type != Voice::type_release_trigger) {
839 itVoiceToBeKilled->Kill(itNoteOnEvent);
840 --VoiceSpawnsLeft; //FIXME: just a hack, we should better check in StealVoice() if the voice was killed due to key conflict
841 }
842 }
843 }
844 }
845 }
846
847 Voice::type_t VoiceType = Voice::type_normal;
848
849 // get current dimension values to select the right dimension region
850 //TODO: for stolen voices this dimension region selection block is processed twice, this should be changed
851 //FIXME: controller values for selecting the dimension region here are currently not sample accurate
852 uint DimValues[8] = { 0 };
853 for (int i = pRegion->Dimensions - 1; i >= 0; i--) {
854 switch (pRegion->pDimensionDefinitions[i].dimension) {
855 case ::gig::dimension_samplechannel:
856 DimValues[i] = 0; //TODO: we currently ignore this dimension
857 break;
858 case ::gig::dimension_layer:
859 DimValues[i] = iLayer;
860 break;
861 case ::gig::dimension_velocity:
862 DimValues[i] = itNoteOnEvent->Param.Note.Velocity;
863 break;
864 case ::gig::dimension_channelaftertouch:
865 DimValues[i] = 0; //TODO: we currently ignore this dimension
866 break;
867 case ::gig::dimension_releasetrigger:
868 VoiceType = (ReleaseTriggerVoice) ? Voice::type_release_trigger : (!iLayer) ? Voice::type_release_trigger_required : Voice::type_normal;
869 DimValues[i] = (uint) ReleaseTriggerVoice;
870 break;
871 case ::gig::dimension_keyboard:
872 DimValues[i] = (uint) pEngineChannel->CurrentKeyDimension;
873 break;
874 case ::gig::dimension_roundrobin:
875 DimValues[i] = (uint) pEngineChannel->pMIDIKeyInfo[MIDIKey].RoundRobinIndex; // incremented for each note on
876 break;
877 case ::gig::dimension_random:
878 RandomSeed = RandomSeed * 1103515245 + 12345; // classic pseudo random number generator
879 DimValues[i] = (uint) RandomSeed >> (32 - pRegion->pDimensionDefinitions[i].bits); // highest bits are most random
880 break;
881 case ::gig::dimension_modwheel:
882 DimValues[i] = pEngineChannel->ControllerTable[1];
883 break;
884 case ::gig::dimension_breath:
885 DimValues[i] = pEngineChannel->ControllerTable[2];
886 break;
887 case ::gig::dimension_foot:
888 DimValues[i] = pEngineChannel->ControllerTable[4];
889 break;
890 case ::gig::dimension_portamentotime:
891 DimValues[i] = pEngineChannel->ControllerTable[5];
892 break;
893 case ::gig::dimension_effect1:
894 DimValues[i] = pEngineChannel->ControllerTable[12];
895 break;
896 case ::gig::dimension_effect2:
897 DimValues[i] = pEngineChannel->ControllerTable[13];
898 break;
899 case ::gig::dimension_genpurpose1:
900 DimValues[i] = pEngineChannel->ControllerTable[16];
901 break;
902 case ::gig::dimension_genpurpose2:
903 DimValues[i] = pEngineChannel->ControllerTable[17];
904 break;
905 case ::gig::dimension_genpurpose3:
906 DimValues[i] = pEngineChannel->ControllerTable[18];
907 break;
908 case ::gig::dimension_genpurpose4:
909 DimValues[i] = pEngineChannel->ControllerTable[19];
910 break;
911 case ::gig::dimension_sustainpedal:
912 DimValues[i] = pEngineChannel->ControllerTable[64];
913 break;
914 case ::gig::dimension_portamento:
915 DimValues[i] = pEngineChannel->ControllerTable[65];
916 break;
917 case ::gig::dimension_sostenutopedal:
918 DimValues[i] = pEngineChannel->ControllerTable[66];
919 break;
920 case ::gig::dimension_softpedal:
921 DimValues[i] = pEngineChannel->ControllerTable[67];
922 break;
923 case ::gig::dimension_genpurpose5:
924 DimValues[i] = pEngineChannel->ControllerTable[80];
925 break;
926 case ::gig::dimension_genpurpose6:
927 DimValues[i] = pEngineChannel->ControllerTable[81];
928 break;
929 case ::gig::dimension_genpurpose7:
930 DimValues[i] = pEngineChannel->ControllerTable[82];
931 break;
932 case ::gig::dimension_genpurpose8:
933 DimValues[i] = pEngineChannel->ControllerTable[83];
934 break;
935 case ::gig::dimension_effect1depth:
936 DimValues[i] = pEngineChannel->ControllerTable[91];
937 break;
938 case ::gig::dimension_effect2depth:
939 DimValues[i] = pEngineChannel->ControllerTable[92];
940 break;
941 case ::gig::dimension_effect3depth:
942 DimValues[i] = pEngineChannel->ControllerTable[93];
943 break;
944 case ::gig::dimension_effect4depth:
945 DimValues[i] = pEngineChannel->ControllerTable[94];
946 break;
947 case ::gig::dimension_effect5depth:
948 DimValues[i] = pEngineChannel->ControllerTable[95];
949 break;
950 case ::gig::dimension_none:
951 std::cerr << "gig::Engine::LaunchVoice() Error: dimension=none\n" << std::flush;
952 break;
953 default:
954 std::cerr << "gig::Engine::LaunchVoice() Error: Unknown dimension\n" << std::flush;
955 }
956 }
957 ::gig::DimensionRegion* pDimRgn = pRegion->GetDimensionRegionByValue(DimValues);
958
959 // no need to continue if sample is silent
960 if (!pDimRgn->pSample || !pDimRgn->pSample->SamplesTotal) return Pool<Voice>::Iterator();
961
962 // allocate a new voice for the key
963 Pool<Voice>::Iterator itNewVoice = pKey->pActiveVoices->allocAppend();
964 if (itNewVoice) {
965 // launch the new voice
966 if (itNewVoice->Trigger(pEngineChannel, itNoteOnEvent, pEngineChannel->Pitch, pDimRgn, VoiceType, iKeyGroup) < 0) {
967 dmsg(4,("Voice not triggered\n"));
968 pKey->pActiveVoices->free(itNewVoice);
969 }
970 else { // on success
971 --VoiceSpawnsLeft;
972 if (!pKey->Active) { // mark as active key
973 pKey->Active = true;
974 pKey->itSelf = pEngineChannel->pActiveKeys->allocAppend();
975 *pKey->itSelf = itNoteOnEvent->Param.Note.Key;
976 }
977 if (itNewVoice->KeyGroup) {
978 uint** ppKeyGroup = &pEngineChannel->ActiveKeyGroups[itNewVoice->KeyGroup];
979 *ppKeyGroup = &*pKey->itSelf; // put key as the (new) active key to its key group
980 }
981 if (itNewVoice->Type == Voice::type_release_trigger_required) pKey->ReleaseTrigger = true; // mark key for the need of release triggered voice(s)
982 return itNewVoice; // success
983 }
984 }
985 else if (VoiceStealing) {
986 // try to steal one voice
987 int result = StealVoice(pEngineChannel, itNoteOnEvent);
988 if (!result) { // voice stolen successfully
989 // put note-on event into voice-stealing queue, so it will be reprocessed after killed voice died
990 RTList<Event>::Iterator itStealEvent = pVoiceStealingQueue->allocAppend();
991 if (itStealEvent) {
992 *itStealEvent = *itNoteOnEvent; // copy event
993 itStealEvent->Param.Note.Layer = iLayer;
994 itStealEvent->Param.Note.ReleaseTrigger = ReleaseTriggerVoice;
995 pKey->VoiceTheftsQueued++;
996 }
997 else dmsg(1,("Voice stealing queue full!\n"));
998 }
999 }
1000
1001 return Pool<Voice>::Iterator(); // no free voice or error
1002 }
1003
1004 /**
1005 * Will be called by LaunchVoice() method in case there are no free
1006 * voices left. This method will select and kill one old voice for
1007 * voice stealing and postpone the note-on event until the selected
1008 * voice actually died.
1009 *
1010 * @param pEngineChannel - engine channel on which this event occured on
1011 * @param itNoteOnEvent - key, velocity and time stamp of the event
1012 * @returns 0 on success, a value < 0 if no active voice could be picked for voice stealing
1013 */
1014 int Engine::StealVoice(EngineChannel* pEngineChannel, Pool<Event>::Iterator& itNoteOnEvent) {
1015 if (VoiceSpawnsLeft <= 0) {
1016 dmsg(1,("Max. voice thefts per audio fragment reached (you may raise CONFIG_MAX_VOICES).\n"));
1017 return -1;
1018 }
1019 if (!pEventPool->poolIsEmpty()) {
1020
1021 RTList<Voice>::Iterator itSelectedVoice;
1022
1023 // Select one voice for voice stealing
1024 switch (CONFIG_VOICE_STEAL_ALGO) {
1025
1026 // try to pick the oldest voice on the key where the new
1027 // voice should be spawned, if there is no voice on that
1028 // key, or no voice left to kill, then procceed with
1029 // 'oldestkey' algorithm
1030 case voice_steal_algo_oldestvoiceonkey: {
1031 midi_key_info_t* pSelectedKey = &pEngineChannel->pMIDIKeyInfo[itNoteOnEvent->Param.Note.Key];
1032 itSelectedVoice = pSelectedKey->pActiveVoices->first();
1033 // proceed iterating if voice was created in this fragment cycle
1034 while (itSelectedVoice && !itSelectedVoice->IsStealable()) ++itSelectedVoice;
1035 // if we haven't found a voice then proceed with algorithm 'oldestkey'
1036 if (itSelectedVoice && itSelectedVoice->IsStealable()) break;
1037 } // no break - intentional !
1038
1039 // try to pick the oldest voice on the oldest active key
1040 // from the same engine channel
1041 // (caution: must stay after 'oldestvoiceonkey' algorithm !)
1042 case voice_steal_algo_oldestkey: {
1043 // if we already stole in this fragment, try to proceed on same key
1044 if (this->itLastStolenVoice) {
1045 itSelectedVoice = this->itLastStolenVoice;
1046 do {
1047 ++itSelectedVoice;
1048 } while (itSelectedVoice && !itSelectedVoice->IsStealable()); // proceed iterating if voice was created in this fragment cycle
1049 // found a "stealable" voice ?
1050 if (itSelectedVoice && itSelectedVoice->IsStealable()) {
1051 // remember which voice we stole, so we can simply proceed on next voice stealing
1052 this->itLastStolenVoice = itSelectedVoice;
1053 break; // selection succeeded
1054 }
1055 }
1056 // get (next) oldest key
1057 RTList<uint>::Iterator iuiSelectedKey = (this->iuiLastStolenKey) ? ++this->iuiLastStolenKey : pEngineChannel->pActiveKeys->first();
1058 while (iuiSelectedKey) {
1059 midi_key_info_t* pSelectedKey = &pEngineChannel->pMIDIKeyInfo[*iuiSelectedKey];
1060 itSelectedVoice = pSelectedKey->pActiveVoices->first();
1061 // proceed iterating if voice was created in this fragment cycle
1062 while (itSelectedVoice && !itSelectedVoice->IsStealable()) ++itSelectedVoice;
1063 // found a "stealable" voice ?
1064 if (itSelectedVoice && itSelectedVoice->IsStealable()) {
1065 // remember which voice on which key we stole, so we can simply proceed on next voice stealing
1066 this->iuiLastStolenKey = iuiSelectedKey;
1067 this->itLastStolenVoice = itSelectedVoice;
1068 break; // selection succeeded
1069 }
1070 ++iuiSelectedKey; // get next oldest key
1071 }
1072 break;
1073 }
1074
1075 // don't steal anything
1076 case voice_steal_algo_none:
1077 default: {
1078 dmsg(1,("No free voice (voice stealing disabled)!\n"));
1079 return -1;
1080 }
1081 }
1082
1083 // if we couldn't steal a voice from the same engine channel then
1084 // steal oldest voice on the oldest key from any other engine channel
1085 // (the smaller engine channel number, the higher priority)
1086 if (!itSelectedVoice || !itSelectedVoice->IsStealable()) {
1087 EngineChannel* pSelectedChannel;
1088 int iChannelIndex;
1089 // select engine channel
1090 if (pLastStolenChannel) {
1091 pSelectedChannel = pLastStolenChannel;
1092 iChannelIndex = pSelectedChannel->iEngineIndexSelf;
1093 } else { // pick the engine channel followed by this engine channel
1094 iChannelIndex = (pEngineChannel->iEngineIndexSelf + 1) % engineChannels.size();
1095 pSelectedChannel = engineChannels[iChannelIndex];
1096 }
1097
1098 // if we already stole in this fragment, try to proceed on same key
1099 if (this->itLastStolenVoiceGlobally) {
1100 itSelectedVoice = this->itLastStolenVoiceGlobally;
1101 do {
1102 ++itSelectedVoice;
1103 } while (itSelectedVoice && !itSelectedVoice->IsStealable()); // proceed iterating if voice was created in this fragment cycle
1104 }
1105
1106 #if CONFIG_DEVMODE
1107 EngineChannel* pBegin = pSelectedChannel; // to detect endless loop
1108 #endif // CONFIG_DEVMODE
1109
1110 // did we find a 'stealable' voice?
1111 if (itSelectedVoice && itSelectedVoice->IsStealable()) {
1112 // remember which voice we stole, so we can simply proceed on next voice stealing
1113 this->itLastStolenVoiceGlobally = itSelectedVoice;
1114 } else while (true) { // iterate through engine channels
1115 // get (next) oldest key
1116 RTList<uint>::Iterator iuiSelectedKey = (this->iuiLastStolenKeyGlobally) ? ++this->iuiLastStolenKeyGlobally : pSelectedChannel->pActiveKeys->first();
1117 this->iuiLastStolenKeyGlobally = RTList<uint>::Iterator(); // to prevent endless loop (see line above)
1118 while (iuiSelectedKey) {
1119 midi_key_info_t* pSelectedKey = &pSelectedChannel->pMIDIKeyInfo[*iuiSelectedKey];
1120 itSelectedVoice = pSelectedKey->pActiveVoices->first();
1121 // proceed iterating if voice was created in this fragment cycle
1122 while (itSelectedVoice && !itSelectedVoice->IsStealable()) ++itSelectedVoice;
1123 // found a "stealable" voice ?
1124 if (itSelectedVoice && itSelectedVoice->IsStealable()) {
1125 // remember which voice on which key on which engine channel we stole, so we can simply proceed on next voice stealing
1126 this->iuiLastStolenKeyGlobally = iuiSelectedKey;
1127 this->itLastStolenVoiceGlobally = itSelectedVoice;
1128 this->pLastStolenChannel = pSelectedChannel;
1129 goto stealable_voice_found; // selection succeeded
1130 }
1131 ++iuiSelectedKey; // get next key on current engine channel
1132 }
1133 // get next engine channel
1134 iChannelIndex = (iChannelIndex + 1) % engineChannels.size();
1135 pSelectedChannel = engineChannels[iChannelIndex];
1136
1137 #if CONFIG_DEVMODE
1138 if (pSelectedChannel == pBegin) {
1139 dmsg(1,("FATAL ERROR: voice stealing endless loop!\n"));
1140 dmsg(1,("VoiceSpawnsLeft=%d.\n", VoiceSpawnsLeft));
1141 dmsg(1,("Exiting.\n"));
1142 exit(-1);
1143 }
1144 #endif // CONFIG_DEVMODE
1145 }
1146 }
1147
1148 // jump point if a 'stealable' voice was found
1149 stealable_voice_found:
1150
1151 #if CONFIG_DEVMODE
1152 if (!itSelectedVoice->IsActive()) {
1153 dmsg(1,("gig::Engine: ERROR, tried to steal a voice which was not active !!!\n"));
1154 return -1;
1155 }
1156 #endif // CONFIG_DEVMODE
1157
1158 // now kill the selected voice
1159 itSelectedVoice->Kill(itNoteOnEvent);
1160
1161 --VoiceSpawnsLeft;
1162
1163 return 0; // success
1164 }
1165 else {
1166 dmsg(1,("Event pool emtpy!\n"));
1167 return -1;
1168 }
1169 }
1170
1171 /**
1172 * Removes the given voice from the MIDI key's list of active voices.
1173 * This method will be called when a voice went inactive, e.g. because
1174 * it finished to playback its sample, finished its release stage or
1175 * just was killed.
1176 *
1177 * @param pEngineChannel - engine channel on which this event occured on
1178 * @param itVoice - points to the voice to be freed
1179 */
1180 void Engine::FreeVoice(EngineChannel* pEngineChannel, Pool<Voice>::Iterator& itVoice) {
1181 if (itVoice) {
1182 midi_key_info_t* pKey = &pEngineChannel->pMIDIKeyInfo[itVoice->MIDIKey];
1183
1184 uint keygroup = itVoice->KeyGroup;
1185
1186 // free the voice object
1187 pVoicePool->free(itVoice);
1188
1189 // if no other voices left and member of a key group, remove from key group
1190 if (pKey->pActiveVoices->isEmpty() && keygroup) {
1191 uint** ppKeyGroup = &pEngineChannel->ActiveKeyGroups[keygroup];
1192 if (*ppKeyGroup == &*pKey->itSelf) *ppKeyGroup = NULL; // remove key from key group
1193 }
1194 }
1195 else std::cerr << "Couldn't release voice! (!itVoice)\n" << std::flush;
1196 }
1197
1198 /**
1199 * Called when there's no more voice left on a key, this call will
1200 * update the key info respectively.
1201 *
1202 * @param pEngineChannel - engine channel on which this event occured on
1203 * @param pKey - key which is now inactive
1204 */
1205 void Engine::FreeKey(EngineChannel* pEngineChannel, midi_key_info_t* pKey) {
1206 if (pKey->pActiveVoices->isEmpty()) {
1207 pKey->Active = false;
1208 pEngineChannel->pActiveKeys->free(pKey->itSelf); // remove key from list of active keys
1209 pKey->itSelf = RTList<uint>::Iterator();
1210 pKey->ReleaseTrigger = false;
1211 pKey->pEvents->clear();
1212 dmsg(3,("Key has no more voices now\n"));
1213 }
1214 else dmsg(1,("gig::Engine: Oops, tried to free a key which contains voices.\n"));
1215 }
1216
1217 /**
1218 * Reacts on supported control change commands (e.g. pitch bend wheel,
1219 * modulation wheel, aftertouch).
1220 *
1221 * @param pEngineChannel - engine channel on which this event occured on
1222 * @param itControlChangeEvent - controller, value and time stamp of the event
1223 */
1224 void Engine::ProcessControlChange(EngineChannel* pEngineChannel, Pool<Event>::Iterator& itControlChangeEvent) {
1225 dmsg(4,("Engine::ContinuousController cc=%d v=%d\n", itControlChangeEvent->Param.CC.Controller, itControlChangeEvent->Param.CC.Value));
1226
1227 // update controller value in the engine channel's controller table
1228 pEngineChannel->ControllerTable[itControlChangeEvent->Param.CC.Controller] = itControlChangeEvent->Param.CC.Value;
1229
1230 switch (itControlChangeEvent->Param.CC.Controller) {
1231 case 5: { // portamento time
1232 pEngineChannel->PortamentoTime = (float) itControlChangeEvent->Param.CC.Value / 127.0f * (float) CONFIG_PORTAMENTO_TIME_MAX + (float) CONFIG_PORTAMENTO_TIME_MIN;
1233 break;
1234 }
1235 case 7: { // volume
1236 //TODO: not sample accurate yet
1237 pEngineChannel->GlobalVolume = VolumeCurve[itControlChangeEvent->Param.CC.Value] * CONFIG_GLOBAL_ATTENUATION;
1238 pEngineChannel->bStatusChanged = true; // engine channel status has changed, so set notify flag
1239 break;
1240 }
1241 case 10: { // panpot
1242 //TODO: not sample accurate yet
1243 pEngineChannel->GlobalPanLeft = PanCurve[128 - itControlChangeEvent->Param.CC.Value];
1244 pEngineChannel->GlobalPanRight = PanCurve[itControlChangeEvent->Param.CC.Value];
1245 break;
1246 }
1247 case 64: { // sustain
1248 if (itControlChangeEvent->Param.CC.Value >= 64 && !pEngineChannel->SustainPedal) {
1249 dmsg(4,("DAMPER (RIGHT) PEDAL DOWN\n"));
1250 pEngineChannel->SustainPedal = true;
1251
1252 #if !CONFIG_PROCESS_MUTED_CHANNELS
1253 if (pEngineChannel->GetMute()) return; // skip if sampler channel is muted
1254 #endif
1255
1256 // cancel release process of voices if necessary
1257 RTList<uint>::Iterator iuiKey = pEngineChannel->pActiveKeys->first();
1258 for (; iuiKey; ++iuiKey) {
1259 midi_key_info_t* pKey = &pEngineChannel->pMIDIKeyInfo[*iuiKey];
1260 if (!pKey->KeyPressed) {
1261 RTList<Event>::Iterator itNewEvent = pKey->pEvents->allocAppend();
1262 if (itNewEvent) {
1263 *itNewEvent = *itControlChangeEvent; // copy event to the key's own event list
1264 itNewEvent->Type = Event::type_cancel_release; // transform event type
1265 }
1266 else dmsg(1,("Event pool emtpy!\n"));
1267 }
1268 }
1269 }
1270 if (itControlChangeEvent->Param.CC.Value < 64 && pEngineChannel->SustainPedal) {
1271 dmsg(4,("DAMPER (RIGHT) PEDAL UP\n"));
1272 pEngineChannel->SustainPedal = false;
1273
1274 #if !CONFIG_PROCESS_MUTED_CHANNELS
1275 if (pEngineChannel->GetMute()) return; // skip if sampler channel is muted
1276 #endif
1277
1278 // release voices if their respective key is not pressed
1279 RTList<uint>::Iterator iuiKey = pEngineChannel->pActiveKeys->first();
1280 for (; iuiKey; ++iuiKey) {
1281 midi_key_info_t* pKey = &pEngineChannel->pMIDIKeyInfo[*iuiKey];
1282 if (!pKey->KeyPressed && ShouldReleaseVoice(pEngineChannel, *iuiKey)) {
1283 RTList<Event>::Iterator itNewEvent = pKey->pEvents->allocAppend();
1284 if (itNewEvent) {
1285 *itNewEvent = *itControlChangeEvent; // copy event to the key's own event list
1286 itNewEvent->Type = Event::type_release; // transform event type
1287 }
1288 else dmsg(1,("Event pool emtpy!\n"));
1289 }
1290 }
1291 }
1292 break;
1293 }
1294 case 65: { // portamento on / off
1295 KillAllVoices(pEngineChannel, itControlChangeEvent);
1296 pEngineChannel->PortamentoMode = itControlChangeEvent->Param.CC.Value >= 64;
1297 break;
1298 }
1299 case 66: { // sostenuto
1300 if (itControlChangeEvent->Param.CC.Value >= 64 && !pEngineChannel->SostenutoPedal) {
1301 dmsg(4,("SOSTENUTO (CENTER) PEDAL DOWN\n"));
1302 pEngineChannel->SostenutoPedal = true;
1303
1304 #if !CONFIG_PROCESS_MUTED_CHANNELS
1305 if (pEngineChannel->GetMute()) return; // skip if sampler channel is muted
1306 #endif
1307
1308 SostenutoKeyCount = 0;
1309 // Remeber the pressed keys
1310 RTList<uint>::Iterator iuiKey = pEngineChannel->pActiveKeys->first();
1311 for (; iuiKey; ++iuiKey) {
1312 midi_key_info_t* pKey = &pEngineChannel->pMIDIKeyInfo[*iuiKey];
1313 if (pKey->KeyPressed && SostenutoKeyCount < 128) SostenutoKeys[SostenutoKeyCount++] = *iuiKey;
1314 }
1315 }
1316 if (itControlChangeEvent->Param.CC.Value < 64 && pEngineChannel->SostenutoPedal) {
1317 dmsg(4,("SOSTENUTO (CENTER) PEDAL UP\n"));
1318 pEngineChannel->SostenutoPedal = false;
1319
1320 #if !CONFIG_PROCESS_MUTED_CHANNELS
1321 if (pEngineChannel->GetMute()) return; // skip if sampler channel is muted
1322 #endif
1323
1324 // release voices if the damper pedal is up and their respective key is not pressed
1325 for (int i = 0; i < SostenutoKeyCount; i++) {
1326 midi_key_info_t* pKey = &pEngineChannel->pMIDIKeyInfo[SostenutoKeys[i]];
1327 if (!pKey->KeyPressed && !pEngineChannel->SustainPedal) {
1328 RTList<Event>::Iterator itNewEvent = pKey->pEvents->allocAppend();
1329 if (itNewEvent) {
1330 *itNewEvent = *itControlChangeEvent; // copy event to the key's own event list
1331 itNewEvent->Type = Event::type_release; // transform event type
1332 }
1333 else dmsg(1,("Event pool emtpy!\n"));
1334 }
1335 }
1336 }
1337 break;
1338 }
1339
1340
1341 // Channel Mode Messages
1342
1343 case 120: { // all sound off
1344 KillAllVoices(pEngineChannel, itControlChangeEvent);
1345 break;
1346 }
1347 case 121: { // reset all controllers
1348 pEngineChannel->ResetControllers();
1349 break;
1350 }
1351 case 123: { // all notes off
1352 ReleaseAllVoices(pEngineChannel, itControlChangeEvent);
1353 break;
1354 }
1355 case 126: { // mono mode on
1356 KillAllVoices(pEngineChannel, itControlChangeEvent);
1357 pEngineChannel->SoloMode = true;
1358 break;
1359 }
1360 case 127: { // poly mode on
1361 KillAllVoices(pEngineChannel, itControlChangeEvent);
1362 pEngineChannel->SoloMode = false;
1363 break;
1364 }
1365 }
1366 }
1367
1368 /**
1369 * Reacts on MIDI system exclusive messages.
1370 *
1371 * @param itSysexEvent - sysex data size and time stamp of the sysex event
1372 */
1373 void Engine::ProcessSysex(Pool<Event>::Iterator& itSysexEvent) {
1374 RingBuffer<uint8_t>::NonVolatileReader reader = pSysexBuffer->get_non_volatile_reader();
1375
1376 uint8_t exclusive_status, id;
1377 if (!reader.pop(&exclusive_status)) goto free_sysex_data;
1378 if (!reader.pop(&id)) goto free_sysex_data;
1379 if (exclusive_status != 0xF0) goto free_sysex_data;
1380
1381 switch (id) {
1382 case 0x41: { // Roland
1383 dmsg(3,("Roland Sysex\n"));
1384 uint8_t device_id, model_id, cmd_id;
1385 if (!reader.pop(&device_id)) goto free_sysex_data;
1386 if (!reader.pop(&model_id)) goto free_sysex_data;
1387 if (!reader.pop(&cmd_id)) goto free_sysex_data;
1388 if (model_id != 0x42 /*GS*/) goto free_sysex_data;
1389 if (cmd_id != 0x12 /*DT1*/) goto free_sysex_data;
1390
1391 // command address
1392 uint8_t addr[3]; // 2 byte addr MSB, followed by 1 byte addr LSB)
1393 const RingBuffer<uint8_t>::NonVolatileReader checksum_reader = reader; // so we can calculate the check sum later
1394 if (reader.read(&addr[0], 3) != 3) goto free_sysex_data;
1395 if (addr[0] == 0x40 && addr[1] == 0x00) { // System Parameters
1396 dmsg(3,("\tSystem Parameter\n"));
1397 }
1398 else if (addr[0] == 0x40 && addr[1] == 0x01) { // Common Parameters
1399 dmsg(3,("\tCommon Parameter\n"));
1400 }
1401 else if (addr[0] == 0x40 && (addr[1] & 0xf0) == 0x10) { // Part Parameters (1)
1402 dmsg(3,("\tPart Parameter\n"));
1403 switch (addr[2]) {
1404 case 0x40: { // scale tuning
1405 dmsg(3,("\t\tScale Tuning\n"));
1406 uint8_t scale_tunes[12]; // detuning of all 12 semitones of an octave
1407 if (reader.read(&scale_tunes[0], 12) != 12) goto free_sysex_data;
1408 uint8_t checksum;
1409 if (!reader.pop(&checksum)) goto free_sysex_data;
1410 #if CONFIG_ASSERT_GS_SYSEX_CHECKSUM
1411 if (GSCheckSum(checksum_reader, 12)) goto free_sysex_data;
1412 #endif // CONFIG_ASSERT_GS_SYSEX_CHECKSUM
1413 for (int i = 0; i < 12; i++) scale_tunes[i] -= 64;
1414 AdjustScale((int8_t*) scale_tunes);
1415 dmsg(3,("\t\t\tNew scale applied.\n"));
1416 break;
1417 }
1418 }
1419 }
1420 else if (addr[0] == 0x40 && (addr[1] & 0xf0) == 0x20) { // Part Parameters (2)
1421 }
1422 else if (addr[0] == 0x41) { // Drum Setup Parameters
1423 }
1424 break;
1425 }
1426 }
1427
1428 free_sysex_data: // finally free sysex data
1429 pSysexBuffer->increment_read_ptr(itSysexEvent->Param.Sysex.Size);
1430 }
1431
1432 /**
1433 * Calculates the Roland GS sysex check sum.
1434 *
1435 * @param AddrReader - reader which currently points to the first GS
1436 * command address byte of the GS sysex message in
1437 * question
1438 * @param DataSize - size of the GS message data (in bytes)
1439 */
1440 uint8_t Engine::GSCheckSum(const RingBuffer<uint8_t>::NonVolatileReader AddrReader, uint DataSize) {
1441 RingBuffer<uint8_t>::NonVolatileReader reader = AddrReader;
1442 uint bytes = 3 /*addr*/ + DataSize;
1443 uint8_t addr_and_data[bytes];
1444 reader.read(&addr_and_data[0], bytes);
1445 uint8_t sum = 0;
1446 for (uint i = 0; i < bytes; i++) sum += addr_and_data[i];
1447 return 128 - sum % 128;
1448 }
1449
1450 /**
1451 * Allows to tune each of the twelve semitones of an octave.
1452 *
1453 * @param ScaleTunes - detuning of all twelve semitones (in cents)
1454 */
1455 void Engine::AdjustScale(int8_t ScaleTunes[12]) {
1456 memcpy(&this->ScaleTuning[0], &ScaleTunes[0], 12); //TODO: currently not sample accurate
1457 }
1458
1459 /**
1460 * Releases all voices on an engine channel. All voices will go into
1461 * the release stage and thus it might take some time (e.g. dependant to
1462 * their envelope release time) until they actually die.
1463 *
1464 * @param pEngineChannel - engine channel on which all voices should be released
1465 * @param itReleaseEvent - event which caused this releasing of all voices
1466 */
1467 void Engine::ReleaseAllVoices(EngineChannel* pEngineChannel, Pool<Event>::Iterator& itReleaseEvent) {
1468 RTList<uint>::Iterator iuiKey = pEngineChannel->pActiveKeys->first();
1469 while (iuiKey) {
1470 midi_key_info_t* pKey = &pEngineChannel->pMIDIKeyInfo[*iuiKey];
1471 ++iuiKey;
1472 // append a 'release' event to the key's own event list
1473 RTList<Event>::Iterator itNewEvent = pKey->pEvents->allocAppend();
1474 if (itNewEvent) {
1475 *itNewEvent = *itReleaseEvent; // copy original event (to the key's event list)
1476 itNewEvent->Type = Event::type_release; // transform event type
1477 }
1478 else dmsg(1,("Event pool emtpy!\n"));
1479 }
1480 }
1481
1482 /**
1483 * Kills all voices on an engine channel as soon as possible. Voices
1484 * won't get into release state, their volume level will be ramped down
1485 * as fast as possible.
1486 *
1487 * @param pEngineChannel - engine channel on which all voices should be killed
1488 * @param itKillEvent - event which caused this killing of all voices
1489 */
1490 void Engine::KillAllVoices(EngineChannel* pEngineChannel, Pool<Event>::Iterator& itKillEvent) {
1491 RTList<uint>::Iterator iuiKey = pEngineChannel->pActiveKeys->first();
1492 RTList<uint>::Iterator end = pEngineChannel->pActiveKeys->end();
1493 while (iuiKey != end) { // iterate through all active keys
1494 midi_key_info_t* pKey = &pEngineChannel->pMIDIKeyInfo[*iuiKey];
1495 ++iuiKey;
1496 RTList<Voice>::Iterator itVoice = pKey->pActiveVoices->first();
1497 RTList<Voice>::Iterator itVoicesEnd = pKey->pActiveVoices->end();
1498 for (; itVoice != itVoicesEnd; ++itVoice) { // iterate through all voices on this key
1499 itVoice->Kill(itKillEvent);
1500 --VoiceSpawnsLeft; //FIXME: just a temporary workaround, we should check the cause in StealVoice() instead
1501 }
1502 }
1503 }
1504
1505 /**
1506 * Determines whether the specified voice should be released.
1507 *
1508 * @param pEngineChannel - The engine channel on which the voice should be checked
1509 * @param Key - The key number
1510 * @returns true if the specified should be released, false otherwise.
1511 */
1512 bool Engine::ShouldReleaseVoice(EngineChannel* pEngineChannel, int Key) {
1513 if (pEngineChannel->SustainPedal) return false;
1514
1515 if (pEngineChannel->SostenutoPedal) {
1516 for (int i = 0; i < SostenutoKeyCount; i++)
1517 if (Key == SostenutoKeys[i]) return false;
1518 }
1519
1520 return true;
1521 }
1522
1523 uint Engine::VoiceCount() {
1524 return ActiveVoiceCount;
1525 }
1526
1527 uint Engine::VoiceCountMax() {
1528 return ActiveVoiceCountMax;
1529 }
1530
1531 bool Engine::DiskStreamSupported() {
1532 return true;
1533 }
1534
1535 uint Engine::DiskStreamCount() {
1536 return (pDiskThread) ? pDiskThread->ActiveStreamCount : 0;
1537 }
1538
1539 uint Engine::DiskStreamCountMax() {
1540 return (pDiskThread) ? pDiskThread->ActiveStreamCountMax : 0;
1541 }
1542
1543 String Engine::DiskStreamBufferFillBytes() {
1544 return pDiskThread->GetBufferFillBytes();
1545 }
1546
1547 String Engine::DiskStreamBufferFillPercentage() {
1548 return pDiskThread->GetBufferFillPercentage();
1549 }
1550
1551 String Engine::EngineName() {
1552 return LS_GIG_ENGINE_NAME;
1553 }
1554
1555 String Engine::Description() {
1556 return "Gigasampler Engine";
1557 }
1558
1559 String Engine::Version() {
1560 String s = "$Revision: 1.59 $";
1561 return s.substr(11, s.size() - 13); // cut dollar signs, spaces and CVS macro keyword
1562 }
1563
1564 // static constant initializers
1565 const float* Engine::VolumeCurve(InitVolumeCurve());
1566 const float* Engine::PanCurve(InitPanCurve());
1567 const float* Engine::CrossfadeCurve(InitCrossfadeCurve());
1568
1569 float* Engine::InitVolumeCurve() {
1570 // line-segment approximation
1571 const float segments[] = {
1572 0, 0, 2, 0.0046, 16, 0.016, 31, 0.051, 45, 0.115, 54.5, 0.2,
1573 64.5, 0.39, 74, 0.74, 92, 1.03, 114, 1.94, 119.2, 2.2, 127, 2.2
1574 };
1575 return InitCurve(segments);
1576 }
1577
1578 float* Engine::InitPanCurve() {
1579 // line-segment approximation
1580 const float segments[] = {
1581 0, 0, 1, 0,
1582 2, 0.05, 31.5, 0.7, 51, 0.851, 74.5, 1.12,
1583 127, 1.41, 128, 1.41
1584 };
1585 return InitCurve(segments, 129);
1586 }
1587
1588 float* Engine::InitCrossfadeCurve() {
1589 // line-segment approximation
1590 const float segments[] = {
1591 0, 0, 1, 0.03, 10, 0.1, 51, 0.58, 127, 1
1592 };
1593 return InitCurve(segments);
1594 }
1595
1596 float* Engine::InitCurve(const float* segments, int size) {
1597 float* y = new float[size];
1598 for (int x = 0 ; x < size ; x++) {
1599 if (x > segments[2]) segments += 2;
1600 y[x] = segments[1] + (x - segments[0]) *
1601 (segments[3] - segments[1]) / (segments[2] - segments[0]);
1602 }
1603 return y;
1604 }
1605
1606 }} // namespace LinuxSampler::gig

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