/[svn]/linuxsampler/trunk/src/engines/gig/Engine.cpp
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revision 1700 by persson, Sun Feb 17 12:40:59 2008 UTC revision 2072 by persson, Sat Mar 20 11:37:52 2010 UTC
# Line 4  Line 4 
4   *                                                                         *   *                                                                         *
5   *   Copyright (C) 2003,2004 by Benno Senoner and Christian Schoenebeck    *   *   Copyright (C) 2003,2004 by Benno Senoner and Christian Schoenebeck    *
6   *   Copyright (C) 2005-2008 Christian Schoenebeck                         *   *   Copyright (C) 2005-2008 Christian Schoenebeck                         *
7     *   Copyright (C) 2009-2010 Christian Schoenebeck and Grigor Iliev        *
8   *                                                                         *   *                                                                         *
9   *   This program is free software; you can redistribute it and/or modify  *   *   This program is free software; you can redistribute it and/or modify  *
10   *   it under the terms of the GNU General Public License as published by  *   *   it under the terms of the GNU General Public License as published by  *
# Line 21  Line 22 
22   *   MA  02111-1307  USA                                                   *   *   MA  02111-1307  USA                                                   *
23   ***************************************************************************/   ***************************************************************************/
24    
 #include <sstream>  
 #include "DiskThread.h"  
 #include "Voice.h"  
 #include "EGADSR.h"  
 #include "../EngineFactory.h"  
   
25  #include "Engine.h"  #include "Engine.h"
26    #include "EngineChannel.h"
 #include "../../common/global_private.h"  
27    
28  namespace LinuxSampler { namespace gig {  namespace LinuxSampler { namespace gig {
29        Engine::Format Engine::GetEngineFormat() { return GIG; }
     InstrumentResourceManager Engine::instruments;  
   
     std::map<AudioOutputDevice*,Engine*> Engine::engines;  
   
     /**  
      * Get a gig::Engine object for the given gig::EngineChannel and the  
      * given AudioOutputDevice. All engine channels which are connected to  
      * the same audio output device will use the same engine instance. This  
      * method will be called by a gig::EngineChannel whenever it's  
      * connecting to a audio output device.  
      *  
      * @param pChannel - engine channel which acquires an engine object  
      * @param pDevice  - the audio output device \a pChannel is connected to  
      */  
     Engine* Engine::AcquireEngine(LinuxSampler::gig::EngineChannel* pChannel, AudioOutputDevice* pDevice) {  
         Engine* pEngine = NULL;  
         // check if there's already an engine for the given audio output device  
         if (engines.count(pDevice)) {  
             dmsg(4,("Using existing gig::Engine.\n"));  
             pEngine = engines[pDevice];  
   
             // Disable the engine while the new engine channel is  
             // added and initialized. The engine will be enabled again  
             // in EngineChannel::Connect.  
             pEngine->DisableAndLock();  
         } else { // create a new engine (and disk thread) instance for the given audio output device  
             dmsg(4,("Creating new gig::Engine.\n"));  
             pEngine = (Engine*) EngineFactory::Create("gig");  
             pEngine->Connect(pDevice);  
             engines[pDevice] = pEngine;  
         }  
         // register engine channel to the engine instance  
         pEngine->engineChannels.add(pChannel);  
         // remember index in the ArrayList  
         pChannel->iEngineIndexSelf = pEngine->engineChannels.size() - 1;  
         dmsg(4,("This gig::Engine has now %d EngineChannels.\n",pEngine->engineChannels.size()));  
         return pEngine;  
     }  
   
     /**  
      * Once an engine channel is disconnected from an audio output device,  
      * it will immediately call this method to unregister itself from the  
      * engine instance and if that engine instance is not used by any other  
      * engine channel anymore, then that engine instance will be destroyed.  
      *  
      * @param pChannel - engine channel which wants to disconnect from it's  
      *                   engine instance  
      * @param pDevice  - audio output device \a pChannel was connected to  
      */  
     void Engine::FreeEngine(LinuxSampler::gig::EngineChannel* pChannel, AudioOutputDevice* pDevice) {  
         dmsg(4,("Disconnecting EngineChannel from gig::Engine.\n"));  
         Engine* pEngine = engines[pDevice];  
         // unregister EngineChannel from the Engine instance  
         pEngine->engineChannels.remove(pChannel);  
         // if the used Engine instance is not used anymore, then destroy it  
         if (pEngine->engineChannels.empty()) {  
             pDevice->Disconnect(pEngine);  
             engines.erase(pDevice);  
             delete pEngine;  
             dmsg(4,("Destroying gig::Engine.\n"));  
         }  
         else dmsg(4,("This gig::Engine has now %d EngineChannels.\n",pEngine->engineChannels.size()));  
     }  
   
     /**  
      * Constructor  
      */  
     Engine::Engine() : SuspendedRegions(128) {  
         pAudioOutputDevice = NULL;  
         pDiskThread        = NULL;  
         pEventGenerator    = NULL;  
         pSysexBuffer       = new RingBuffer<uint8_t,false>(CONFIG_SYSEX_BUFFER_SIZE, 0);  
         pEventQueue        = new RingBuffer<Event,false>(CONFIG_MAX_EVENTS_PER_FRAGMENT, 0);  
         pEventPool         = new Pool<Event>(CONFIG_MAX_EVENTS_PER_FRAGMENT);  
         pVoicePool         = new Pool<Voice>(CONFIG_MAX_VOICES);  
         pDimRegionPool[0]  = new Pool< ::gig::DimensionRegion*>(CONFIG_MAX_VOICES);  
         pDimRegionPool[1]  = new Pool< ::gig::DimensionRegion*>(CONFIG_MAX_VOICES);  
         pVoiceStealingQueue = new RTList<Event>(pEventPool);  
         pGlobalEvents      = new RTList<Event>(pEventPool);  
   
         for (RTList<Voice>::Iterator iterVoice = pVoicePool->allocAppend(); iterVoice == pVoicePool->last(); iterVoice = pVoicePool->allocAppend()) {  
             iterVoice->SetEngine(this);  
         }  
         pVoicePool->clear();  
   
         ResetInternal();  
         ResetScaleTuning();  
         ResetSuspendedRegions();  
     }  
   
     /**  
      * Destructor  
      */  
     Engine::~Engine() {  
         MidiInputPort::RemoveSysexListener(this);  
         if (pDiskThread) {  
             dmsg(1,("Stopping disk thread..."));  
             pDiskThread->StopThread();  
             delete pDiskThread;  
             dmsg(1,("OK\n"));  
         }  
         if (pEventQueue) delete pEventQueue;  
         if (pEventPool)  delete pEventPool;  
         if (pVoicePool) {  
             pVoicePool->clear();  
             delete pVoicePool;  
         }  
         if (pEventGenerator) delete pEventGenerator;  
         if (pVoiceStealingQueue) delete pVoiceStealingQueue;  
         if (pSysexBuffer) delete pSysexBuffer;  
         if (pGlobalEvents) delete pGlobalEvents;  
         if (pDimRegionPool[0]) delete pDimRegionPool[0];  
         if (pDimRegionPool[1]) delete pDimRegionPool[1];  
         ResetSuspendedRegions();  
         Unregister();  
     }  
   
     void Engine::Enable() {  
         dmsg(3,("gig::Engine: enabling\n"));  
         EngineDisabled.PushAndUnlock(false, 2); // set condition object 'EngineDisabled' to false (wait max. 2s)  
         dmsg(3,("gig::Engine: enabled (val=%d)\n", EngineDisabled.GetUnsafe()));  
     }  
   
     /**  
      * Temporarily stop the engine to not do anything. The engine will just be  
      * frozen during that time, that means after enabling it again it will  
      * continue where it was, with all its voices and playback state it had at  
      * the point of disabling. Notice that the engine's (audio) thread will  
      * continue to run, it just remains in an inactive loop during that time.  
      *  
      * If you need to be sure that all voices and disk streams are killed as  
      * well, use @c SuspendAll() instead.  
      *  
      * @see Enable(), SuspendAll()  
      */  
     void Engine::Disable() {  
         dmsg(3,("gig::Engine: disabling\n"));  
         bool* pWasDisabled = EngineDisabled.PushAndUnlock(true, 2); // wait max. 2s  
         if (!pWasDisabled) dmsg(3,("gig::Engine warning: Timeout waiting to disable engine.\n"));  
     }  
   
     void Engine::DisableAndLock() {  
         dmsg(3,("gig::Engine: disabling\n"));  
         bool* pWasDisabled = EngineDisabled.Push(true, 2); // wait max. 2s  
         if (!pWasDisabled) dmsg(3,("gig::Engine warning: Timeout waiting to disable engine.\n"));  
     }  
   
     /**  
      * Similar to @c Disable() but this method additionally kills all voices  
      * and disk streams and blocks until all voices and disk streams are actually  
      * killed / deleted.  
      *  
      * @e Note: only the original calling thread is able to re-enable the  
      * engine afterwards by calling @c ResumeAll() later on!  
      */  
     void Engine::SuspendAll() {  
         dmsg(2,("gig::Engine: Suspending all ...\n"));  
         // stop the engine, so we can safely modify the engine's  
         // data structures from this foreign thread  
         DisableAndLock();  
         // we could also use the respective class member variable here,  
         // but this is probably safer and cleaner  
         int iPendingStreamDeletions = 0;  
         // kill all voices on all engine channels the *die hard* way  
         for (int iChannel = 0; iChannel < engineChannels.size(); iChannel++) {  
             EngineChannel* pEngineChannel = engineChannels[iChannel];  
             RTList<uint>::Iterator iuiKey = pEngineChannel->pActiveKeys->first();  
             RTList<uint>::Iterator end    = pEngineChannel->pActiveKeys->end();  
             for (; iuiKey != end; ++iuiKey) { // iterate through all active keys  
                 midi_key_info_t* pKey = &pEngineChannel->pMIDIKeyInfo[*iuiKey];  
                 RTList<Voice>::Iterator itVoice = pKey->pActiveVoices->first();  
                 RTList<Voice>::Iterator itVoicesEnd = pKey->pActiveVoices->end();  
                 for (; itVoice != itVoicesEnd; ++itVoice) { // iterate through all voices on this key  
                     // request a notification from disk thread side for stream deletion  
                     const Stream::Handle hStream = itVoice->KillImmediately(true);  
                     if (hStream != Stream::INVALID_HANDLE) { // voice actually used a stream  
                         iPendingStreamDeletions++;  
                     }  
                 }  
             }  
         }  
         // wait until all streams were actually deleted by the disk thread  
         while (iPendingStreamDeletions) {  
             while (  
                 iPendingStreamDeletions &&  
                 pDiskThread->AskForDeletedStream() != Stream::INVALID_HANDLE  
             ) iPendingStreamDeletions--;  
             if (!iPendingStreamDeletions) break;  
             usleep(10000); // sleep for 10ms  
         }  
         dmsg(2,("gig::Engine: Everything suspended.\n"));  
     }  
   
     /**  
      * At the moment same as calling @c Enable() directly, but this might  
      * change in future, so better call this method as counterpart to  
      * @c SuspendAll() instead of @c Enable() !  
      */  
     void Engine::ResumeAll() {  
         Enable();  
     }  
30    
31      /**      /**
32       * Order the engine to stop rendering audio for the given region.       *  Reacts on supported control change commands (e.g. pitch bend wheel,
33       * Additionally this method will block until all voices and their disk       *  modulation wheel, aftertouch).
      * streams associated with that region are actually killed / deleted, so  
      * one can i.e. safely modify the region with an instrument editor after  
      * returning from this method.  
      *  
      * @param pRegion - region the engine shall stop using  
      */  
     void Engine::Suspend(::gig::Region* pRegion) {  
         dmsg(2,("gig::Engine: Suspending Region %x ...\n",pRegion));  
         SuspendedRegionsMutex.Lock();  
         SuspensionChangeOngoing.Set(true);  
         pPendingRegionSuspension = pRegion;  
         SuspensionChangeOngoing.WaitAndUnlockIf(true);  
         SuspendedRegionsMutex.Unlock();  
         dmsg(2,("gig::Engine: Region %x suspended.",pRegion));  
     }  
   
     /**  
      * Orders the engine to resume playing back the given region, previously  
      * suspended with @c Suspend() .  
34       *       *
35       * @param pRegion - region the engine shall be allowed to use again       *  @param pEngineChannel - engine channel on which this event occured on
36       */       *  @param itControlChangeEvent - controller, value and time stamp of the event
     void Engine::Resume(::gig::Region* pRegion) {  
         dmsg(2,("gig::Engine: Resuming Region %x ...\n",pRegion));  
         SuspendedRegionsMutex.Lock();  
         SuspensionChangeOngoing.Set(true);  
         pPendingRegionResumption = pRegion;  
         SuspensionChangeOngoing.WaitAndUnlockIf(true);  
         SuspendedRegionsMutex.Unlock();  
         dmsg(2,("gig::Engine: Region %x resumed.\n",pRegion));  
     }  
   
     /**  
      *  Reset all voices and disk thread and clear input event queue and all  
      *  control and status variables.  
      */  
     void Engine::Reset() {  
         DisableAndLock();  
         ResetInternal();  
         ResetScaleTuning();  
         Enable();  
     }  
   
     /**  
      *  Reset all voices and disk thread and clear input event queue and all  
      *  control and status variables. This method is protected by a mutex.  
      */  
     void Engine::ResetInternal() {  
         ResetInternalMutex.Lock();  
   
         // make sure that the engine does not get any sysex messages  
         // while it's reseting  
         bool sysexDisabled = MidiInputPort::RemoveSysexListener(this);  
         ActiveVoiceCount    = 0;  
         ActiveVoiceCountMax = 0;  
   
         // reset voice stealing parameters  
         pVoiceStealingQueue->clear();  
         itLastStolenVoice          = RTList<Voice>::Iterator();  
         itLastStolenVoiceGlobally  = RTList<Voice>::Iterator();  
         iuiLastStolenKey           = RTList<uint>::Iterator();  
         iuiLastStolenKeyGlobally   = RTList<uint>::Iterator();  
         pLastStolenChannel         = NULL;  
   
         // reset all voices  
         for (RTList<Voice>::Iterator iterVoice = pVoicePool->allocAppend(); iterVoice == pVoicePool->last(); iterVoice = pVoicePool->allocAppend()) {  
             iterVoice->Reset();  
         }  
         pVoicePool->clear();  
   
         // reset disk thread  
         if (pDiskThread) pDiskThread->Reset();  
   
         // delete all input events  
         pEventQueue->init();  
         pSysexBuffer->init();  
         if (sysexDisabled) MidiInputPort::AddSysexListener(this);  
         ResetInternalMutex.Unlock();  
     }  
   
     /**  
      * Reset to normal, chromatic scale (means equal tempered).  
37       */       */
38      void Engine::ResetScaleTuning() {      void Engine::ProcessControlChange (
39          memset(&ScaleTuning[0], 0x00, 12);          LinuxSampler::EngineChannel*  pEngineChannel,
40      }          Pool<Event>::Iterator&        itControlChangeEvent
41        ) {
42            dmsg(4,("Engine::ContinuousController cc=%d v=%d\n", itControlChangeEvent->Param.CC.Controller, itControlChangeEvent->Param.CC.Value));
43    
44      void Engine::ResetSuspendedRegions() {          EngineChannel* pChannel = dynamic_cast<EngineChannel*>(pEngineChannel);
45          SuspendedRegions.clear();          // handle the "control triggered" MIDI rule: a control change
46          iPendingStreamDeletions = 0;          // event can trigger a new note on or note off event
47          pPendingRegionSuspension = pPendingRegionResumption = NULL;          if (pChannel->pInstrument) {
         SuspensionChangeOngoing.Set(false);  
     }  
48    
49      /**              ::gig::MidiRule* rule;
50       * Connect this engine instance with the given audio output device.              for (int i = 0 ; (rule = pChannel->pInstrument->GetMidiRule(i)) ; i++) {
      * This method will be called when an Engine instance is created.  
      * All of the engine's data structures which are dependant to the used  
      * audio output device / driver will be (re)allocated and / or  
      * adjusted appropriately.  
      *  
      * @param pAudioOut - audio output device to connect to  
      */  
     void Engine::Connect(AudioOutputDevice* pAudioOut) {  
         pAudioOutputDevice = pAudioOut;  
51    
52          ResetInternal();                  if (::gig::MidiRuleCtrlTrigger* ctrlTrigger =
53                        dynamic_cast< ::gig::MidiRuleCtrlTrigger*>(rule)) {
54                        if (itControlChangeEvent->Param.CC.Controller ==
55                            ctrlTrigger->ControllerNumber) {
56    
57          // inform audio driver for the need of two channels                          uint8_t oldCCValue = pChannel->ControllerTable[
58          try {                              itControlChangeEvent->Param.CC.Controller];
59              pAudioOutputDevice->AcquireChannels(2); // gig engine only stereo                          uint8_t newCCValue = itControlChangeEvent->Param.CC.Value;
         }  
         catch (AudioOutputException e) {  
             String msg = "Audio output device unable to provide 2 audio channels, cause: " + e.Message();  
             throw Exception(msg);  
         }  
60    
61          this->MaxSamplesPerCycle = pAudioOutputDevice->MaxSamplesPerCycle();                          for (int i = 0 ; i < ctrlTrigger->Triggers ; i++) {
62          this->SampleRate         = pAudioOutputDevice->SampleRate();                              ::gig::MidiRuleCtrlTrigger::trigger_t* pTrigger =
63                                      &ctrlTrigger->pTriggers[i];
64    
65          // FIXME: audio drivers with varying fragment sizes might be a problem here                              // check if the controller has passed the
66          MaxFadeOutPos = MaxSamplesPerCycle - int(double(SampleRate) * CONFIG_EG_MIN_RELEASE_TIME) - 1;                              // trigger point in the right direction
67          if (MaxFadeOutPos < 0) {                              if ((pTrigger->Descending &&
68              std::cerr << "gig::Engine: WARNING, CONFIG_EG_MIN_RELEASE_TIME "                                   oldCCValue > pTrigger->TriggerPoint &&
69                        << "too big for current audio fragment size & sampling rate! "                                   newCCValue <= pTrigger->TriggerPoint) ||
70                        << "May lead to click sounds if voice stealing chimes in!\n" << std::flush;                                  (!pTrigger->Descending &&
71              // force volume ramp downs at the beginning of each fragment                                   oldCCValue < pTrigger->TriggerPoint &&
72              MaxFadeOutPos = 0;                                   newCCValue >= pTrigger->TriggerPoint)) {
             // lower minimum release time  
             const float minReleaseTime = (float) MaxSamplesPerCycle / (float) SampleRate;  
             for (RTList<Voice>::Iterator iterVoice = pVoicePool->allocAppend(); iterVoice == pVoicePool->last(); iterVoice = pVoicePool->allocAppend()) {  
                 iterVoice->EG1.CalculateFadeOutCoeff(minReleaseTime, SampleRate);  
             }  
             pVoicePool->clear();  
         }  
73    
74          // (re)create disk thread                                  RTList<Event>::Iterator itNewEvent = pGlobalEvents->allocAppend();
75          if (this->pDiskThread) {                                  if (itNewEvent) {
76              dmsg(1,("Stopping disk thread..."));                                      *itNewEvent = *itControlChangeEvent;
77              this->pDiskThread->StopThread();                                      itNewEvent->Param.Note.Key = pTrigger->Key;
             delete this->pDiskThread;  
             dmsg(1,("OK\n"));  
         }  
         this->pDiskThread = new DiskThread(((pAudioOut->MaxSamplesPerCycle() << CONFIG_MAX_PITCH) << 1) + 6, //FIXME: assuming stereo  
                                            &instruments);  
         if (!pDiskThread) {  
             dmsg(0,("gig::Engine  new diskthread = NULL\n"));  
             exit(EXIT_FAILURE);  
         }  
78    
79          for (RTList<Voice>::Iterator iterVoice = pVoicePool->allocAppend(); iterVoice == pVoicePool->last(); iterVoice = pVoicePool->allocAppend()) {                                      if (pTrigger->NoteOff || pTrigger->Velocity == 0) {
80              iterVoice->pDiskThread = this->pDiskThread;                                          itNewEvent->Type = Event::type_note_off;
81              dmsg(3,("d"));                                          itNewEvent->Param.Note.Velocity = 100;
         }  
         pVoicePool->clear();  
82    
83          // (re)create event generator                                          ProcessNoteOff(pEngineChannel, itNewEvent);
84          if (pEventGenerator) delete pEventGenerator;                                      } else {
85          pEventGenerator = new EventGenerator(pAudioOut->SampleRate());                                          itNewEvent->Type = Event::type_note_on;
86                                            //TODO: if Velocity is 255, the triggered velocity should
87          dmsg(1,("Starting disk thread..."));                                          // depend on how fast the controller is moving
88          pDiskThread->StartThread();                                          itNewEvent->Param.Note.Velocity =
89          dmsg(1,("OK\n"));                                              pTrigger->Velocity == 255 ? 100 :
90                                                pTrigger->Velocity;
         for (RTList<Voice>::Iterator iterVoice = pVoicePool->allocAppend(); iterVoice == pVoicePool->last(); iterVoice = pVoicePool->allocAppend()) {  
             if (!iterVoice->pDiskThread) {  
                 dmsg(0,("Engine -> voice::trigger: !pDiskThread\n"));  
                 exit(EXIT_FAILURE);  
             }  
         }  
     }  
91    
92      /**                                          ProcessNoteOn(pEngineChannel, itNewEvent);
93       * Called by the engine's (audio) thread once per cycle to process requests                                      }
94       * from the outer world to suspend or resume a given @c gig::Region .                                  }
95       */                                  else dmsg(1,("Event pool emtpy!\n"));
96      void Engine::ProcessSuspensionsChanges() {                              }
         // process request for suspending one region  
         if (pPendingRegionSuspension) {  
             // kill all voices on all engine channels that use this region  
             for (int iChannel = 0; iChannel < engineChannels.size(); iChannel++) {  
                 EngineChannel* pEngineChannel = engineChannels[iChannel];  
                 RTList<uint>::Iterator iuiKey = pEngineChannel->pActiveKeys->first();  
                 RTList<uint>::Iterator end    = pEngineChannel->pActiveKeys->end();  
                 for (; iuiKey != end; ++iuiKey) { // iterate through all active keys  
                     midi_key_info_t* pKey = &pEngineChannel->pMIDIKeyInfo[*iuiKey];  
                     RTList<Voice>::Iterator itVoice = pKey->pActiveVoices->first();  
                     // if current key is not associated with this region, skip this key  
                     if (itVoice->pDimRgn->GetParent() != pPendingRegionSuspension) continue;  
                     RTList<Voice>::Iterator itVoicesEnd = pKey->pActiveVoices->end();  
                     for (; itVoice != itVoicesEnd; ++itVoice) { // iterate through all voices on this key  
                         // request a notification from disk thread side for stream deletion  
                         const Stream::Handle hStream = itVoice->KillImmediately(true);  
                         if (hStream != Stream::INVALID_HANDLE) { // voice actually used a stream  
                             iPendingStreamDeletions++;  
97                          }                          }
98                      }                      }
99                  }                  }
100              }              }
             // make sure the region is not yet on the list  
             bool bAlreadySuspended = false;  
             RTList< ::gig::Region*>::Iterator iter = SuspendedRegions.first();  
             RTList< ::gig::Region*>::Iterator end  = SuspendedRegions.end();  
             for (; iter != end; ++iter) { // iterate through all suspended regions  
                 if (*iter == pPendingRegionSuspension) { // found  
                     bAlreadySuspended = true;  
                     dmsg(1,("gig::Engine: attempt to suspend an already suspended region !!!\n"));  
                     break;  
                 }  
             }  
             if (!bAlreadySuspended) {  
                 // put the region on the list of suspended regions  
                 RTList< ::gig::Region*>::Iterator iter = SuspendedRegions.allocAppend();  
                 if (iter) {  
                     *iter = pPendingRegionSuspension;  
                 } else std::cerr << "gig::Engine: Could not suspend Region, list is full. This is a bug!!!\n" << std::flush;  
             }  
             // free request slot for next caller (and to make sure that  
             // we're not going to process the same request in the next cycle)  
             pPendingRegionSuspension = NULL;  
             // if no disk stream deletions are pending, awaken other side, as  
             // we're done in this case  
             if (!iPendingStreamDeletions) SuspensionChangeOngoing.Set(false);  
         }  
   
         // process request for resuming one region  
         if (pPendingRegionResumption) {  
             // remove region from the list of suspended regions  
             RTList< ::gig::Region*>::Iterator iter = SuspendedRegions.first();  
             RTList< ::gig::Region*>::Iterator end  = SuspendedRegions.end();  
             for (; iter != end; ++iter) { // iterate through all suspended regions  
                 if (*iter == pPendingRegionResumption) { // found  
                     SuspendedRegions.free(iter);  
                     break; // done  
                 }  
             }  
             // free request slot for next caller  
             pPendingRegionResumption = NULL;  
             // awake other side as we're done  
             SuspensionChangeOngoing.Set(false);  
         }  
     }  
   
     /**  
      * Called by the engine's (audio) thread once per cycle to check if  
      * streams of voices that were killed due to suspension request have  
      * finally really been deleted by the disk thread.  
      */  
     void Engine::ProcessPendingStreamDeletions() {  
         if (!iPendingStreamDeletions) return;  
         //TODO: or shall we better store a list with stream handles instead of a scalar amount of streams to be deleted? might be safer  
         while (  
             iPendingStreamDeletions &&  
             pDiskThread->AskForDeletedStream() != Stream::INVALID_HANDLE  
         ) iPendingStreamDeletions--;  
         // just for safety ...  
         while (pDiskThread->AskForDeletedStream() != Stream::INVALID_HANDLE);  
         // now that all disk streams are deleted, awake other side as  
         // we're finally done with suspending the requested region  
         if (!iPendingStreamDeletions) SuspensionChangeOngoing.Set(false);  
     }  
   
     /**  
      * Returns @c true if the given region is currently set to be suspended  
      * from being used, @c false otherwise.  
      */  
     bool Engine::RegionSuspended(::gig::Region* pRegion) {  
         if (SuspendedRegions.isEmpty()) return false;  
         //TODO: or shall we use a sorted container instead of the RTList? might be faster ... or trivial ;-)  
         RTList< ::gig::Region*>::Iterator iter = SuspendedRegions.first();  
         RTList< ::gig::Region*>::Iterator end  = SuspendedRegions.end();  
         for (; iter != end; ++iter)  // iterate through all suspended regions  
             if (*iter == pRegion) return true;  
         return false;  
     }  
   
     /**  
      * Clear all engine global event lists.  
      */  
     void Engine::ClearEventLists() {  
         pGlobalEvents->clear();  
     }  
   
     /**  
      * Copy all events from the engine's global input queue buffer to the  
      * engine's internal event list. This will be done at the beginning of  
      * each audio cycle (that is each RenderAudio() call) to distinguish  
      * all global events which have to be processed in the current audio  
      * cycle. These events are usually just SysEx messages. Every  
      * EngineChannel has it's own input event queue buffer and event list  
      * to handle common events like NoteOn, NoteOff and ControlChange  
      * events.  
      *  
      * @param Samples - number of sample points to be processed in the  
      *                  current audio cycle  
      */  
     void Engine::ImportEvents(uint Samples) {  
         RingBuffer<Event,false>::NonVolatileReader eventQueueReader = pEventQueue->get_non_volatile_reader();  
         Event* pEvent;  
         while (true) {  
             // get next event from input event queue  
             if (!(pEvent = eventQueueReader.pop())) break;  
             // if younger event reached, ignore that and all subsequent ones for now  
             if (pEvent->FragmentPos() >= Samples) {  
                 eventQueueReader--;  
                 dmsg(2,("Younger Event, pos=%d ,Samples=%d!\n",pEvent->FragmentPos(),Samples));  
                 pEvent->ResetFragmentPos();  
                 break;  
             }  
             // copy event to internal event list  
             if (pGlobalEvents->poolIsEmpty()) {  
                 dmsg(1,("Event pool emtpy!\n"));  
                 break;  
             }  
             *pGlobalEvents->allocAppend() = *pEvent;  
         }  
         eventQueueReader.free(); // free all copied events from input queue  
     }  
   
     /**  
      * Let this engine proceed to render the given amount of sample points.  
      * The engine will iterate through all engine channels and render audio  
      * for each engine channel independently. The calculated audio data of  
      * all voices of each engine channel will be placed into the audio sum  
      * buffers of the respective audio output device, connected to the  
      * respective engine channel.  
      *  
      *  @param Samples - number of sample points to be rendered  
      *  @returns       0 on success  
      */  
     int Engine::RenderAudio(uint Samples) {  
         dmsg(8,("RenderAudio(Samples=%d)\n", Samples));  
   
         // return if engine disabled  
         if (EngineDisabled.Pop()) {  
             dmsg(5,("gig::Engine: engine disabled (val=%d)\n",EngineDisabled.GetUnsafe()));  
             return 0;  
         }  
   
         // process requests for suspending / resuming regions (i.e. to avoid  
         // crashes while these regions are modified by an instrument editor)  
         ProcessSuspensionsChanges();  
   
         // update time of start and end of this audio fragment (as events' time stamps relate to this)  
         pEventGenerator->UpdateFragmentTime(Samples);  
   
         // We only allow a maximum of CONFIG_MAX_VOICES voices to be spawned  
         // in each audio fragment. All subsequent request for spawning new  
         // voices in the same audio fragment will be ignored.  
         VoiceSpawnsLeft = CONFIG_MAX_VOICES;  
   
         // get all events from the engine's global input event queue which belong to the current fragment  
         // (these are usually just SysEx messages)  
         ImportEvents(Samples);  
   
         // process engine global events (these are currently only MIDI System Exclusive messages)  
         {  
             RTList<Event>::Iterator itEvent = pGlobalEvents->first();  
             RTList<Event>::Iterator end     = pGlobalEvents->end();  
             for (; itEvent != end; ++itEvent) {  
                 switch (itEvent->Type) {  
                     case Event::type_sysex:  
                         dmsg(5,("Engine: Sysex received\n"));  
                         ProcessSysex(itEvent);  
                         break;  
                 }  
             }  
         }  
   
         // reset internal voice counter (just for statistic of active voices)  
         ActiveVoiceCountTemp = 0;  
   
         // handle instrument change commands  
         bool instrumentChanged = false;  
         for (int i = 0; i < engineChannels.size(); i++) {  
             EngineChannel* pEngineChannel = engineChannels[i];  
   
             // as we're going to (carefully) write some status to the  
             // synchronized struct, we cast away the const  
             EngineChannel::instrument_change_command_t& cmd =  
                 const_cast<EngineChannel::instrument_change_command_t&>(pEngineChannel->InstrumentChangeCommandReader.Lock());  
   
             pEngineChannel->pDimRegionsInUse = cmd.pDimRegionsInUse;  
             pEngineChannel->pDimRegionsInUse->clear();  
   
             if (cmd.bChangeInstrument) {  
                 // change instrument  
                 dmsg(5,("Engine: instrument change command received\n"));  
                 cmd.bChangeInstrument = false;  
                 pEngineChannel->pInstrument = cmd.pInstrument;  
                 instrumentChanged = true;  
   
                 // Iterate through all active voices and mark them as  
                 // "orphans", which means that the dimension regions  
                 // and samples they use should be released to the  
                 // instrument resource manager when the voices die.  
                 int i = 0;  
                 RTList<uint>::Iterator iuiKey = pEngineChannel->pActiveKeys->first();  
                 RTList<uint>::Iterator end    = pEngineChannel->pActiveKeys->end();  
                 while (iuiKey != end) { // iterate through all active keys  
                     midi_key_info_t* pKey = &pEngineChannel->pMIDIKeyInfo[*iuiKey];  
                     ++iuiKey;  
   
                     RTList<Voice>::Iterator itVoice     = pKey->pActiveVoices->first();  
                     RTList<Voice>::Iterator itVoicesEnd = pKey->pActiveVoices->end();  
                     for (; itVoice != itVoicesEnd; ++itVoice) { // iterate through all voices on this key  
                         itVoice->Orphan = true;  
                     }  
                 }  
             }  
         }  
         if (instrumentChanged) {  
             //TODO: this is a lazy solution ATM and not safe in case somebody is currently editing the instrument we're currently switching to (we should store all suspended regions on instrument manager side and when switching to another instrument copy that list to the engine's local list of suspensions  
             ResetSuspendedRegions();  
         }  
   
         // handle events on all engine channels  
         for (int i = 0; i < engineChannels.size(); i++) {  
             ProcessEvents(engineChannels[i], Samples);  
         }  
   
         // render all 'normal', active voices on all engine channels  
         for (int i = 0; i < engineChannels.size(); i++) {  
             RenderActiveVoices(engineChannels[i], Samples);  
         }  
   
         // now that all ordinary voices on ALL engine channels are rendered, render new stolen voices  
         RenderStolenVoices(Samples);  
   
         // handle audio routing for engine channels with FX sends  
         for (int i = 0; i < engineChannels.size(); i++) {  
             if (engineChannels[i]->fxSends.empty()) continue; // ignore if no FX sends  
             RouteAudio(engineChannels[i], Samples);  
         }  
   
         // handle cleanup on all engine channels for the next audio fragment  
         for (int i = 0; i < engineChannels.size(); i++) {  
             PostProcess(engineChannels[i]);  
         }  
   
   
         // empty the engine's event list for the next audio fragment  
         ClearEventLists();  
   
         // reset voice stealing for the next audio fragment  
         pVoiceStealingQueue->clear();  
   
         // just some statistics about this engine instance  
         ActiveVoiceCount = ActiveVoiceCountTemp;  
         if (ActiveVoiceCount > ActiveVoiceCountMax) ActiveVoiceCountMax = ActiveVoiceCount;  
   
         // in case regions were previously suspended and we killed voices  
         // with disk streams due to that, check if those streams have finally  
         // been deleted by the disk thread  
         if (iPendingStreamDeletions) ProcessPendingStreamDeletions();  
   
         for (int i = 0; i < engineChannels.size(); i++) {  
             engineChannels[i]->InstrumentChangeCommandReader.Unlock();  
         }  
         FrameTime += Samples;  
   
         return 0;  
     }  
   
     /**  
      * Dispatch and handle all events in this audio fragment for the given  
      * engine channel.  
      *  
      * @param pEngineChannel - engine channel on which events should be  
      *                         processed  
      * @param Samples        - amount of sample points to be processed in  
      *                         this audio fragment cycle  
      */  
     void Engine::ProcessEvents(EngineChannel* pEngineChannel, uint Samples) {  
         // get all events from the engine channels's input event queue which belong to the current fragment  
         // (these are the common events like NoteOn, NoteOff, ControlChange, etc.)  
         pEngineChannel->ImportEvents(Samples);  
   
         // process events  
         {  
             RTList<Event>::Iterator itEvent = pEngineChannel->pEvents->first();  
             RTList<Event>::Iterator end     = pEngineChannel->pEvents->end();  
             for (; itEvent != end; ++itEvent) {  
                 switch (itEvent->Type) {  
                     case Event::type_note_on:  
                         dmsg(5,("Engine: Note on received\n"));  
                         ProcessNoteOn((EngineChannel*)itEvent->pEngineChannel, itEvent);  
                         break;  
                     case Event::type_note_off:  
                         dmsg(5,("Engine: Note off received\n"));  
                         ProcessNoteOff((EngineChannel*)itEvent->pEngineChannel, itEvent);  
                         break;  
                     case Event::type_control_change:  
                         dmsg(5,("Engine: MIDI CC received\n"));  
                         ProcessControlChange((EngineChannel*)itEvent->pEngineChannel, itEvent);  
                         break;  
                     case Event::type_pitchbend:  
                         dmsg(5,("Engine: Pitchbend received\n"));  
                         ProcessPitchbend((EngineChannel*)itEvent->pEngineChannel, itEvent);  
                         break;  
                 }  
             }  
         }  
   
         // reset voice stealing for the next engine channel (or next audio fragment)  
         itLastStolenVoice         = RTList<Voice>::Iterator();  
         itLastStolenVoiceGlobally = RTList<Voice>::Iterator();  
         iuiLastStolenKey          = RTList<uint>::Iterator();  
         iuiLastStolenKeyGlobally  = RTList<uint>::Iterator();  
         pLastStolenChannel        = NULL;  
     }  
   
     /**  
      * Render all 'normal' voices (that is voices which were not stolen in  
      * this fragment) on the given engine channel.  
      *  
      * @param pEngineChannel - engine channel on which audio should be  
      *                         rendered  
      * @param Samples        - amount of sample points to be rendered in  
      *                         this audio fragment cycle  
      */  
     void Engine::RenderActiveVoices(EngineChannel* pEngineChannel, uint Samples) {  
         #if !CONFIG_PROCESS_MUTED_CHANNELS  
         if (pEngineChannel->GetMute()) return; // skip if sampler channel is muted  
         #endif  
   
         uint voiceCount = 0;  
         uint streamCount = 0;  
         RTList<uint>::Iterator iuiKey = pEngineChannel->pActiveKeys->first();  
         RTList<uint>::Iterator end    = pEngineChannel->pActiveKeys->end();  
         while (iuiKey != end) { // iterate through all active keys  
             midi_key_info_t* pKey = &pEngineChannel->pMIDIKeyInfo[*iuiKey];  
             ++iuiKey;  
   
             RTList<Voice>::Iterator itVoice     = pKey->pActiveVoices->first();  
             RTList<Voice>::Iterator itVoicesEnd = pKey->pActiveVoices->end();  
             for (; itVoice != itVoicesEnd; ++itVoice) { // iterate through all voices on this key  
                 // now render current voice  
                 itVoice->Render(Samples);  
                 if (itVoice->IsActive()) { // still active  
                     if (!itVoice->Orphan) {  
                         *(pEngineChannel->pDimRegionsInUse->allocAppend()) = itVoice->pDimRgn;  
                     }  
                     ActiveVoiceCountTemp++;  
                     voiceCount++;  
   
                     if (itVoice->PlaybackState == Voice::playback_state_disk) {  
                         if ((itVoice->DiskStreamRef).State == Stream::state_active) streamCount++;  
                     }  
                 }  else { // voice reached end, is now inactive  
                     FreeVoice(pEngineChannel, itVoice); // remove voice from the list of active voices  
                 }  
             }  
101          }          }
102    
103          pEngineChannel->SetVoiceCount(voiceCount);          // update controller value in the engine channel's controller table
104          pEngineChannel->SetDiskStreamCount(streamCount);          pChannel->ControllerTable[itControlChangeEvent->Param.CC.Controller] = itControlChangeEvent->Param.CC.Value;
     }  
105    
106      /**          ProcessHardcodedControllers(pEngineChannel, itControlChangeEvent);
      * Render all stolen voices (only voices which were stolen in this  
      * fragment) on the given engine channel. Stolen voices are rendered  
      * after all normal voices have been rendered; this is needed to render  
      * audio of those voices which were selected for voice stealing until  
      * the point were the stealing (that is the take over of the voice)  
      * actually happened.  
      *  
      * @param pEngineChannel - engine channel on which audio should be  
      *                         rendered  
      * @param Samples        - amount of sample points to be rendered in  
      *                         this audio fragment cycle  
      */  
     void Engine::RenderStolenVoices(uint Samples) {  
         RTList<Event>::Iterator itVoiceStealEvent = pVoiceStealingQueue->first();  
         RTList<Event>::Iterator end               = pVoiceStealingQueue->end();  
         for (; itVoiceStealEvent != end; ++itVoiceStealEvent) {  
             EngineChannel* pEngineChannel = (EngineChannel*) itVoiceStealEvent->pEngineChannel;  
             if (!pEngineChannel->pInstrument) continue; // ignore if no instrument loaded  
             Pool<Voice>::Iterator itNewVoice =  
                 LaunchVoice(pEngineChannel, itVoiceStealEvent, itVoiceStealEvent->Param.Note.Layer, itVoiceStealEvent->Param.Note.ReleaseTrigger, false, false);  
             if (itNewVoice) {  
                 itNewVoice->Render(Samples);  
                 if (itNewVoice->IsActive()) { // still active  
                     *(pEngineChannel->pDimRegionsInUse->allocAppend()) = itNewVoice->pDimRgn;  
                     ActiveVoiceCountTemp++;  
                     pEngineChannel->SetVoiceCount(pEngineChannel->GetVoiceCount() + 1);  
   
                     if (itNewVoice->PlaybackState == Voice::playback_state_disk) {  
                         if (itNewVoice->DiskStreamRef.State == Stream::state_active) {  
                             pEngineChannel->SetDiskStreamCount(pEngineChannel->GetDiskStreamCount() + 1);  
                         }  
                     }  
                 } else { // voice reached end, is now inactive  
                     FreeVoice(pEngineChannel, itNewVoice); // remove voice from the list of active voices  
                 }  
             }  
             else dmsg(1,("gig::Engine: ERROR, voice stealing didn't work out!\n"));  
107    
108              // we need to clear the key's event list explicitly here in case key was never active          // handle FX send controllers
109              midi_key_info_t* pKey = &pEngineChannel->pMIDIKeyInfo[itVoiceStealEvent->Param.Note.Key];          ProcessFxSendControllers(pChannel, itControlChangeEvent);
             pKey->VoiceTheftsQueued--;  
             if (!pKey->Active && !pKey->VoiceTheftsQueued) pKey->pEvents->clear();  
         }  
110      }      }
111    
112      /**      DiskThread* Engine::CreateDiskThread() {
113       * Will be called in case the respective engine channel sports FX send          return new DiskThread (
114       * channels. In this particular case, engine channel local buffers are              iMaxDiskStreams,
115       * used to render and mix all voices to. This method is responsible for              ((pAudioOutputDevice->MaxSamplesPerCycle() << CONFIG_MAX_PITCH) << 1) + 6, //FIXME: assuming stereo
116       * copying the audio data from those local buffers to the master audio              &instruments
117       * output channels as well as to the FX send audio output channels with          );
118       * their respective FX send levels.      }
119       *  
120       * @param pEngineChannel - engine channel from which audio should be      void Engine::TriggerNewVoices (
121       *                         routed          LinuxSampler::EngineChannel* pEngineChannel,
122       * @param Samples        - amount of sample points to be routed in          RTList<Event>::Iterator&     itNoteOnEvent,
123       *                         this audio fragment cycle          bool                         HandleKeyGroupConflicts
124       */      ) {
125      void Engine::RouteAudio(EngineChannel* pEngineChannel, uint Samples) {          EngineChannel* pChannel = static_cast<EngineChannel*>(pEngineChannel);
126          // route master signal          // first, get total amount of required voices (dependant on amount of layers)
127          {          ::gig::Region* pRegion = pChannel->pInstrument->GetRegion(itNoteOnEvent->Param.Note.Key);
128              AudioChannel* pDstL = pAudioOutputDevice->Channel(pEngineChannel->AudioDeviceChannelLeft);          if (pRegion && !RegionSuspended(pRegion)) {
129              AudioChannel* pDstR = pAudioOutputDevice->Channel(pEngineChannel->AudioDeviceChannelRight);              int voicesRequired = pRegion->Layers;
130              pEngineChannel->pChannelLeft->MixTo(pDstL, Samples);              // now launch the required amount of voices
131              pEngineChannel->pChannelRight->MixTo(pDstR, Samples);              for (int i = 0; i < voicesRequired; i++)
132                    LaunchVoice(pChannel, itNoteOnEvent, i, false, true, HandleKeyGroupConflicts);
133          }          }
         // route FX send signal  
         {  
             for (int iFxSend = 0; iFxSend < pEngineChannel->GetFxSendCount(); iFxSend++) {  
                 FxSend* pFxSend = pEngineChannel->GetFxSend(iFxSend);  
                 // left channel  
                 const int iDstL = pFxSend->DestinationChannel(0);  
                 if (iDstL < 0) {  
                     dmsg(1,("Engine::RouteAudio() Error: invalid FX send (L) destination channel"));  
                 } else {  
                     AudioChannel* pDstL = pAudioOutputDevice->Channel(iDstL);  
                     if (!pDstL) {  
                         dmsg(1,("Engine::RouteAudio() Error: invalid FX send (L) destination channel"));  
                     } else pEngineChannel->pChannelLeft->MixTo(pDstL, Samples, pFxSend->Level());  
                 }  
                 // right channel  
                 const int iDstR = pFxSend->DestinationChannel(1);  
                 if (iDstR < 0) {  
                     dmsg(1,("Engine::RouteAudio() Error: invalid FX send (R) destination channel"));  
                 } else {  
                     AudioChannel* pDstR = pAudioOutputDevice->Channel(iDstR);  
                     if (!pDstR) {  
                         dmsg(1,("Engine::RouteAudio() Error: invalid FX send (R) destination channel"));  
                     } else pEngineChannel->pChannelRight->MixTo(pDstR, Samples, pFxSend->Level());  
                 }  
             }  
         }  
         // reset buffers with silence (zero out) for the next audio cycle  
         pEngineChannel->pChannelLeft->Clear();  
         pEngineChannel->pChannelRight->Clear();  
134      }      }
135    
136      /**      void Engine::TriggerReleaseVoices (
137       * Free all keys which have turned inactive in this audio fragment, from          LinuxSampler::EngineChannel*  pEngineChannel,
138       * the list of active keys and clear all event lists on that engine          RTList<Event>::Iterator&      itNoteOffEvent
139       * channel.      ) {
140       *          EngineChannel* pChannel = static_cast<EngineChannel*>(pEngineChannel);
141       * @param pEngineChannel - engine channel to cleanup          MidiKey* pKey = &pChannel->pMIDIKeyInfo[itNoteOffEvent->Param.Note.Key];
142       */          // first, get total amount of required voices (dependant on amount of layers)
143      void Engine::PostProcess(EngineChannel* pEngineChannel) {          ::gig::Region* pRegion = pChannel->pInstrument->GetRegion(itNoteOffEvent->Param.Note.Key);
144          // free all keys which have no active voices left          if (pRegion) {
145          {              int voicesRequired = pRegion->Layers;
146              RTList<uint>::Iterator iuiKey = pEngineChannel->pActiveKeys->first();  
147              RTList<uint>::Iterator end    = pEngineChannel->pActiveKeys->end();              // MIDI note-on velocity is used instead of note-off velocity
148              while (iuiKey != end) { // iterate through all active keys              itNoteOffEvent->Param.Note.Velocity = pKey->Velocity;
149                  midi_key_info_t* pKey = &pEngineChannel->pMIDIKeyInfo[*iuiKey];  
150                  ++iuiKey;              // now launch the required amount of voices
151                  if (pKey->pActiveVoices->isEmpty()) FreeKey(pEngineChannel, pKey);              for (int i = 0; i < voicesRequired; i++)
152                  #if CONFIG_DEVMODE                  LaunchVoice(pChannel, itNoteOffEvent, i, true, false, false); //FIXME: for the moment we don't perform voice stealing for release triggered samples
                 else { // just a sanity check for debugging  
                     RTList<Voice>::Iterator itVoice     = pKey->pActiveVoices->first();  
                     RTList<Voice>::Iterator itVoicesEnd = pKey->pActiveVoices->end();  
                     for (; itVoice != itVoicesEnd; ++itVoice) { // iterate through all voices on this key  
                         if (itVoice->itKillEvent) {  
                             dmsg(1,("gig::Engine: ERROR, killed voice survived !!!\n"));  
                         }  
                     }  
                 }  
                 #endif // CONFIG_DEVMODE  
             }  
153          }          }
   
         // empty the engine channel's own event lists  
         pEngineChannel->ClearEventLists();  
154      }      }
155    
156      /**      Pool<Voice>::Iterator Engine::LaunchVoice (
157       *  Will be called by the MIDI input device whenever a MIDI system          LinuxSampler::EngineChannel*  pEngineChannel,
158       *  exclusive message has arrived.          Pool<Event>::Iterator&        itNoteOnEvent,
159       *          int                           iLayer,
160       *  @param pData - pointer to sysex data          bool                          ReleaseTriggerVoice,
161       *  @param Size  - lenght of sysex data (in bytes)          bool                          VoiceStealing,
162       */          bool                          HandleKeyGroupConflicts
163      void Engine::SendSysex(void* pData, uint Size) {      ) {
164          Event event             = pEventGenerator->CreateEvent();          EngineChannel* pChannel = static_cast<EngineChannel*>(pEngineChannel);
165          event.Type              = Event::type_sysex;          int MIDIKey = itNoteOnEvent->Param.Note.Key;
166          event.Param.Sysex.Size  = Size;          EngineChannel::MidiKey* pKey  = &pChannel->pMIDIKeyInfo[MIDIKey];
167          event.pEngineChannel    = NULL; // as Engine global event          ::gig::Region* pRegion = pChannel->pInstrument->GetRegion(MIDIKey);
         if (pEventQueue->write_space() > 0) {  
             if (pSysexBuffer->write_space() >= Size) {  
                 // copy sysex data to input buffer  
                 uint toWrite = Size;  
                 uint8_t* pPos = (uint8_t*) pData;  
                 while (toWrite) {  
                     const uint writeNow = RTMath::Min(toWrite, pSysexBuffer->write_space_to_end());  
                     pSysexBuffer->write(pPos, writeNow);  
                     toWrite -= writeNow;  
                     pPos    += writeNow;  
   
                 }  
                 // finally place sysex event into input event queue  
                 pEventQueue->push(&event);  
             }  
             else dmsg(1,("Engine: Sysex message too large (%d byte) for input buffer (%d byte)!",Size,CONFIG_SYSEX_BUFFER_SIZE));  
         }  
         else dmsg(1,("Engine: Input event queue full!"));  
     }  
   
     /**  
      *  Assigns and triggers a new voice for the respective MIDI key.  
      *  
      *  @param pEngineChannel - engine channel on which this event occured on  
      *  @param itNoteOnEvent - key, velocity and time stamp of the event  
      */  
     void Engine::ProcessNoteOn(EngineChannel* pEngineChannel, Pool<Event>::Iterator& itNoteOnEvent) {  
         #if !CONFIG_PROCESS_MUTED_CHANNELS  
         if (pEngineChannel->GetMute()) return; // skip if sampler channel is muted  
         #endif  
   
         if (!pEngineChannel->pInstrument) return; // ignore if no instrument loaded  
   
         //HACK: we should better add the transpose value only to the most mandatory places (like for retrieving the region and calculating the tuning), because otherwise voices will unintendedly survive when changing transpose while playing  
         itNoteOnEvent->Param.Note.Key += pEngineChannel->GlobalTranspose;  
   
         const int key = itNoteOnEvent->Param.Note.Key;  
         midi_key_info_t* pKey = &pEngineChannel->pMIDIKeyInfo[key];  
   
         // move note on event to the key's own event list  
         RTList<Event>::Iterator itNoteOnEventOnKeyList = itNoteOnEvent.moveToEndOf(pKey->pEvents);  
   
         // if Solo Mode then kill all already active voices  
         if (pEngineChannel->SoloMode) {  
             Pool<uint>::Iterator itYoungestKey = pEngineChannel->pActiveKeys->last();  
             if (itYoungestKey) {  
                 const int iYoungestKey = *itYoungestKey;  
                 const midi_key_info_t* pOtherKey = &pEngineChannel->pMIDIKeyInfo[iYoungestKey];  
                 if (pOtherKey->Active) {  
                     // get final portamento position of currently active voice  
                     if (pEngineChannel->PortamentoMode) {  
                         RTList<Voice>::Iterator itVoice = pOtherKey->pActiveVoices->last();  
                         if (itVoice) itVoice->UpdatePortamentoPos(itNoteOnEventOnKeyList);  
                     }  
                     // kill all voices on the (other) key  
                     RTList<Voice>::Iterator itVoiceToBeKilled = pOtherKey->pActiveVoices->first();  
                     RTList<Voice>::Iterator end               = pOtherKey->pActiveVoices->end();  
                     for (; itVoiceToBeKilled != end; ++itVoiceToBeKilled) {  
                         if (itVoiceToBeKilled->Type != Voice::type_release_trigger)  
                             itVoiceToBeKilled->Kill(itNoteOnEventOnKeyList);  
                     }  
                 }  
             }  
             // set this key as 'currently active solo key'  
             pEngineChannel->SoloKey = key;  
         }  
   
         // Change key dimension value if key is in keyswitching area  
         {  
             const ::gig::Instrument* pInstrument = pEngineChannel->pInstrument;  
             if (key >= pInstrument->DimensionKeyRange.low && key <= pInstrument->DimensionKeyRange.high)  
                 pEngineChannel->CurrentKeyDimension = float(key - pInstrument->DimensionKeyRange.low) /  
                     (pInstrument->DimensionKeyRange.high - pInstrument->DimensionKeyRange.low + 1);  
         }  
   
         pKey->KeyPressed = true; // the MIDI key was now pressed down  
         pKey->Velocity   = itNoteOnEventOnKeyList->Param.Note.Velocity;  
         pKey->NoteOnTime = FrameTime + itNoteOnEventOnKeyList->FragmentPos(); // will be used to calculate note length  
   
         // cancel release process of voices on this key if needed  
         if (pKey->Active && !pEngineChannel->SustainPedal) {  
             RTList<Event>::Iterator itCancelReleaseEvent = pKey->pEvents->allocAppend();  
             if (itCancelReleaseEvent) {  
                 *itCancelReleaseEvent = *itNoteOnEventOnKeyList;         // copy event  
                 itCancelReleaseEvent->Type = Event::type_cancel_release; // transform event type  
             }  
             else dmsg(1,("Event pool emtpy!\n"));  
         }  
   
         // allocate and trigger new voice(s) for the key  
         {  
             // first, get total amount of required voices (dependant on amount of layers)  
             ::gig::Region* pRegion = pEngineChannel->pInstrument->GetRegion(itNoteOnEventOnKeyList->Param.Note.Key);  
             if (pRegion && !RegionSuspended(pRegion)) {  
                 int voicesRequired = pRegion->Layers;  
                 // now launch the required amount of voices  
                 for (int i = 0; i < voicesRequired; i++)  
                     LaunchVoice(pEngineChannel, itNoteOnEventOnKeyList, i, false, true, true);  
             }  
         }  
   
         // if neither a voice was spawned or postponed then remove note on event from key again  
         if (!pKey->Active && !pKey->VoiceTheftsQueued)  
             pKey->pEvents->free(itNoteOnEventOnKeyList);  
   
         if (!pEngineChannel->SoloMode || pEngineChannel->PortamentoPos < 0.0f) pEngineChannel->PortamentoPos = (float) key;  
         pKey->RoundRobinIndex++;  
     }  
   
     /**  
      *  Releases the voices on the given key if sustain pedal is not pressed.  
      *  If sustain is pressed, the release of the note will be postponed until  
      *  sustain pedal will be released or voice turned inactive by itself (e.g.  
      *  due to completion of sample playback).  
      *  
      *  @param pEngineChannel - engine channel on which this event occured on  
      *  @param itNoteOffEvent - key, velocity and time stamp of the event  
      */  
     void Engine::ProcessNoteOff(EngineChannel* pEngineChannel, Pool<Event>::Iterator& itNoteOffEvent) {  
         #if !CONFIG_PROCESS_MUTED_CHANNELS  
         if (pEngineChannel->GetMute()) return; // skip if sampler channel is muted  
         #endif  
   
         //HACK: we should better add the transpose value only to the most mandatory places (like for retrieving the region and calculating the tuning), because otherwise voices will unintendedly survive when changing transpose while playing  
         itNoteOffEvent->Param.Note.Key += pEngineChannel->GlobalTranspose;  
   
         const int iKey = itNoteOffEvent->Param.Note.Key;  
         midi_key_info_t* pKey = &pEngineChannel->pMIDIKeyInfo[iKey];  
         pKey->KeyPressed = false; // the MIDI key was now released  
   
         // move event to the key's own event list  
         RTList<Event>::Iterator itNoteOffEventOnKeyList = itNoteOffEvent.moveToEndOf(pKey->pEvents);  
   
         bool bShouldRelease = pKey->Active && ShouldReleaseVoice(pEngineChannel, itNoteOffEventOnKeyList->Param.Note.Key);  
   
         // in case Solo Mode is enabled, kill all voices on this key and respawn a voice on the highest pressed key (if any)  
         if (pEngineChannel->SoloMode && pEngineChannel->pInstrument) { //TODO: this feels like too much code just for handling solo mode :P  
             bool bOtherKeysPressed = false;  
             if (iKey == pEngineChannel->SoloKey) {  
                 pEngineChannel->SoloKey = -1;  
                 // if there's still a key pressed down, respawn a voice (group) on the highest key  
                 for (int i = 127; i > 0; i--) {  
                     midi_key_info_t* pOtherKey = &pEngineChannel->pMIDIKeyInfo[i];  
                     if (pOtherKey->KeyPressed) {  
                         bOtherKeysPressed = true;  
                         // make the other key the new 'currently active solo key'  
                         pEngineChannel->SoloKey = i;  
                         // get final portamento position of currently active voice  
                         if (pEngineChannel->PortamentoMode) {  
                             RTList<Voice>::Iterator itVoice = pKey->pActiveVoices->first();  
                             if (itVoice) itVoice->UpdatePortamentoPos(itNoteOffEventOnKeyList);  
                         }  
                         // create a pseudo note on event  
                         RTList<Event>::Iterator itPseudoNoteOnEvent = pOtherKey->pEvents->allocAppend();  
                         if (itPseudoNoteOnEvent) {  
                             // copy event  
                             *itPseudoNoteOnEvent = *itNoteOffEventOnKeyList;  
                             // transform event to a note on event  
                             itPseudoNoteOnEvent->Type                = Event::type_note_on;  
                             itPseudoNoteOnEvent->Param.Note.Key      = i;  
                             itPseudoNoteOnEvent->Param.Note.Velocity = pOtherKey->Velocity;  
                             // allocate and trigger new voice(s) for the other key  
                             {  
                                 // first, get total amount of required voices (dependant on amount of layers)  
                                 ::gig::Region* pRegion = pEngineChannel->pInstrument->GetRegion(i);  
                                 if (pRegion) {  
                                     int voicesRequired = pRegion->Layers;  
                                     // now launch the required amount of voices  
                                     for (int iLayer = 0; iLayer < voicesRequired; iLayer++)  
                                         LaunchVoice(pEngineChannel, itPseudoNoteOnEvent, iLayer, false, true, false);  
                                 }  
                             }  
                             // if neither a voice was spawned or postponed then remove note on event from key again  
                             if (!pOtherKey->Active && !pOtherKey->VoiceTheftsQueued)  
                                 pOtherKey->pEvents->free(itPseudoNoteOnEvent);  
   
                         } else dmsg(1,("Could not respawn voice, no free event left\n"));  
                         break; // done  
                     }  
                 }  
             }  
             if (bOtherKeysPressed) {  
                 if (pKey->Active) { // kill all voices on this key  
                     bShouldRelease = false; // no need to release, as we kill it here  
                     RTList<Voice>::Iterator itVoiceToBeKilled = pKey->pActiveVoices->first();  
                     RTList<Voice>::Iterator end               = pKey->pActiveVoices->end();  
                     for (; itVoiceToBeKilled != end; ++itVoiceToBeKilled) {  
                         if (itVoiceToBeKilled->Type != Voice::type_release_trigger)  
                             itVoiceToBeKilled->Kill(itNoteOffEventOnKeyList);  
                     }  
                 }  
             } else pEngineChannel->PortamentoPos = -1.0f;  
         }  
   
         // if no solo mode (the usual case) or if solo mode and no other key pressed, then release voices on this key if needed  
         if (bShouldRelease) {  
             itNoteOffEventOnKeyList->Type = Event::type_release; // transform event type  
   
             // spawn release triggered voice(s) if needed  
             if (pKey->ReleaseTrigger && pEngineChannel->pInstrument) {  
                 // first, get total amount of required voices (dependant on amount of layers)  
                 ::gig::Region* pRegion = pEngineChannel->pInstrument->GetRegion(itNoteOffEventOnKeyList->Param.Note.Key);  
                 if (pRegion) {  
                     int voicesRequired = pRegion->Layers;  
   
                     // MIDI note-on velocity is used instead of note-off velocity  
                     itNoteOffEventOnKeyList->Param.Note.Velocity = pKey->Velocity;  
   
                     // now launch the required amount of voices  
                     for (int i = 0; i < voicesRequired; i++)  
                         LaunchVoice(pEngineChannel, itNoteOffEventOnKeyList, i, true, false, false); //FIXME: for the moment we don't perform voice stealing for release triggered samples  
                 }  
                 pKey->ReleaseTrigger = false;  
             }  
         }  
   
         // if neither a voice was spawned or postponed on this key then remove note off event from key again  
         if (!pKey->Active && !pKey->VoiceTheftsQueued)  
             pKey->pEvents->free(itNoteOffEventOnKeyList);  
     }  
   
     /**  
      *  Moves pitchbend event from the general (input) event list to the engine  
      *  channel's event list. It will actually processed later by the  
      *  respective voice.  
      *  
      *  @param pEngineChannel - engine channel on which this event occured on  
      *  @param itPitchbendEvent - absolute pitch value and time stamp of the event  
      */  
     void Engine::ProcessPitchbend(EngineChannel* pEngineChannel, Pool<Event>::Iterator& itPitchbendEvent) {  
         pEngineChannel->Pitch = itPitchbendEvent->Param.Pitch.Pitch; // store current pitch value  
     }  
   
     /**  
      *  Allocates and triggers a new voice. This method will usually be  
      *  called by the ProcessNoteOn() method and by the voices itself  
      *  (e.g. to spawn further voices on the same key for layered sounds).  
      *  
      *  @param pEngineChannel      - engine channel on which this event occured on  
      *  @param itNoteOnEvent       - key, velocity and time stamp of the event  
      *  @param iLayer              - layer index for the new voice (optional - only  
      *                               in case of layered sounds of course)  
      *  @param ReleaseTriggerVoice - if new voice is a release triggered voice  
      *                               (optional, default = false)  
      *  @param VoiceStealing       - if voice stealing should be performed  
      *                               when there is no free voice  
      *                               (optional, default = true)  
      *  @param HandleKeyGroupConflicts - if voices should be killed due to a  
      *                                   key group conflict  
      *  @returns pointer to new voice or NULL if there was no free voice or  
      *           if the voice wasn't triggered (for example when no region is  
      *           defined for the given key).  
      */  
     Pool<Voice>::Iterator Engine::LaunchVoice(EngineChannel* pEngineChannel, Pool<Event>::Iterator& itNoteOnEvent, int iLayer, bool ReleaseTriggerVoice, bool VoiceStealing, bool HandleKeyGroupConflicts) {  
         int MIDIKey            = itNoteOnEvent->Param.Note.Key;  
         midi_key_info_t* pKey  = &pEngineChannel->pMIDIKeyInfo[MIDIKey];  
         ::gig::Region* pRegion = pEngineChannel->pInstrument->GetRegion(MIDIKey);  
168    
169          // if nothing defined for this key          // if nothing defined for this key
170          if (!pRegion) return Pool<Voice>::Iterator(); // nothing to do          if (!pRegion) return Pool<Voice>::Iterator(); // nothing to do
# Line 1206  namespace LinuxSampler { namespace gig { Line 173  namespace LinuxSampler { namespace gig {
173          // key group, so the layered voices won't kill each other          // key group, so the layered voices won't kill each other
174          int iKeyGroup = (iLayer == 0 && !ReleaseTriggerVoice) ? pRegion->KeyGroup : 0;          int iKeyGroup = (iLayer == 0 && !ReleaseTriggerVoice) ? pRegion->KeyGroup : 0;
175    
176          // handle key group (a.k.a. exclusive group) conflicts          if (HandleKeyGroupConflicts) pChannel->HandleKeyGroupConflicts(iKeyGroup, itNoteOnEvent);
         if (HandleKeyGroupConflicts) {  
             if (iKeyGroup) { // if this voice / key belongs to a key group  
                 uint** ppKeyGroup = &pEngineChannel->ActiveKeyGroups[iKeyGroup];  
                 if (*ppKeyGroup) { // if there's already an active key in that key group  
                     midi_key_info_t* pOtherKey = &pEngineChannel->pMIDIKeyInfo[**ppKeyGroup];  
                     // kill all voices on the (other) key  
                     RTList<Voice>::Iterator itVoiceToBeKilled = pOtherKey->pActiveVoices->first();  
                     RTList<Voice>::Iterator end               = pOtherKey->pActiveVoices->end();  
                     for (; itVoiceToBeKilled != end; ++itVoiceToBeKilled) {  
                         if (itVoiceToBeKilled->Type != Voice::type_release_trigger) {  
                             itVoiceToBeKilled->Kill(itNoteOnEvent);  
                             --VoiceSpawnsLeft; //FIXME: just a hack, we should better check in StealVoice() if the voice was killed due to key conflict  
                         }  
                     }  
                 }  
             }  
         }  
177    
178          Voice::type_t VoiceType = Voice::type_normal;          Voice::type_t VoiceType = Voice::type_normal;
179    
# Line 1243  namespace LinuxSampler { namespace gig { Line 193  namespace LinuxSampler { namespace gig {
193                      DimValues[i] = itNoteOnEvent->Param.Note.Velocity;                      DimValues[i] = itNoteOnEvent->Param.Note.Velocity;
194                      break;                      break;
195                  case ::gig::dimension_channelaftertouch:                  case ::gig::dimension_channelaftertouch:
196                      DimValues[i] = pEngineChannel->ControllerTable[128];                      DimValues[i] = pChannel->ControllerTable[128];
197                      break;                      break;
198                  case ::gig::dimension_releasetrigger:                  case ::gig::dimension_releasetrigger:
199                      VoiceType = (ReleaseTriggerVoice) ? Voice::type_release_trigger : (!iLayer) ? Voice::type_release_trigger_required : Voice::type_normal;                      VoiceType = (ReleaseTriggerVoice) ? Voice::type_release_trigger : (!iLayer) ? Voice::type_release_trigger_required : Voice::type_normal;
200                      DimValues[i] = (uint) ReleaseTriggerVoice;                      DimValues[i] = (uint) ReleaseTriggerVoice;
201                      break;                      break;
202                  case ::gig::dimension_keyboard:                  case ::gig::dimension_keyboard:
203                      DimValues[i] = (uint) (pEngineChannel->CurrentKeyDimension * pRegion->pDimensionDefinitions[i].zones);                      DimValues[i] = (uint) (pChannel->CurrentKeyDimension * pRegion->pDimensionDefinitions[i].zones);
204                      break;                      break;
205                  case ::gig::dimension_roundrobin:                  case ::gig::dimension_roundrobin:
206                      DimValues[i] = (uint) pEngineChannel->pMIDIKeyInfo[MIDIKey].RoundRobinIndex; // incremented for each note on                      DimValues[i] = uint(*pChannel->pMIDIKeyInfo[MIDIKey].pRoundRobinIndex % pRegion->pDimensionDefinitions[i].zones); // RoundRobinIndex is incremented for each note on in this Region
207                        break;
208                    case ::gig::dimension_roundrobinkeyboard:
209                        DimValues[i] = uint(pChannel->RoundRobinIndex % pRegion->pDimensionDefinitions[i].zones); // RoundRobinIndex is incremented for each note on
210                      break;                      break;
211                  case ::gig::dimension_random:                  case ::gig::dimension_random:
212                      RandomSeed   = RandomSeed * 1103515245 + 12345; // classic pseudo random number generator                      DimValues[i] = uint(Random() * pRegion->pDimensionDefinitions[i].zones);
                     DimValues[i] = (uint) RandomSeed >> (32 - pRegion->pDimensionDefinitions[i].bits); // highest bits are most random  
213                      break;                      break;
214                  case ::gig::dimension_modwheel:                  case ::gig::dimension_modwheel:
215                      DimValues[i] = pEngineChannel->ControllerTable[1];                      DimValues[i] = pChannel->ControllerTable[1];
216                      break;                      break;
217                  case ::gig::dimension_breath:                  case ::gig::dimension_breath:
218                      DimValues[i] = pEngineChannel->ControllerTable[2];                      DimValues[i] = pChannel->ControllerTable[2];
219                      break;                      break;
220                  case ::gig::dimension_foot:                  case ::gig::dimension_foot:
221                      DimValues[i] = pEngineChannel->ControllerTable[4];                      DimValues[i] = pChannel->ControllerTable[4];
222                      break;                      break;
223                  case ::gig::dimension_portamentotime:                  case ::gig::dimension_portamentotime:
224                      DimValues[i] = pEngineChannel->ControllerTable[5];                      DimValues[i] = pChannel->ControllerTable[5];
225                      break;                      break;
226                  case ::gig::dimension_effect1:                  case ::gig::dimension_effect1:
227                      DimValues[i] = pEngineChannel->ControllerTable[12];                      DimValues[i] = pChannel->ControllerTable[12];
228                      break;                      break;
229                  case ::gig::dimension_effect2:                  case ::gig::dimension_effect2:
230                      DimValues[i] = pEngineChannel->ControllerTable[13];                      DimValues[i] = pChannel->ControllerTable[13];
231                      break;                      break;
232                  case ::gig::dimension_genpurpose1:                  case ::gig::dimension_genpurpose1:
233                      DimValues[i] = pEngineChannel->ControllerTable[16];                      DimValues[i] = pChannel->ControllerTable[16];
234                      break;                      break;
235                  case ::gig::dimension_genpurpose2:                  case ::gig::dimension_genpurpose2:
236                      DimValues[i] = pEngineChannel->ControllerTable[17];                      DimValues[i] = pChannel->ControllerTable[17];
237                      break;                      break;
238                  case ::gig::dimension_genpurpose3:                  case ::gig::dimension_genpurpose3:
239                      DimValues[i] = pEngineChannel->ControllerTable[18];                      DimValues[i] = pChannel->ControllerTable[18];
240                      break;                      break;
241                  case ::gig::dimension_genpurpose4:                  case ::gig::dimension_genpurpose4:
242                      DimValues[i] = pEngineChannel->ControllerTable[19];                      DimValues[i] = pChannel->ControllerTable[19];
243                      break;                      break;
244                  case ::gig::dimension_sustainpedal:                  case ::gig::dimension_sustainpedal:
245                      DimValues[i] = pEngineChannel->ControllerTable[64];                      DimValues[i] = pChannel->ControllerTable[64];
246                      break;                      break;
247                  case ::gig::dimension_portamento:                  case ::gig::dimension_portamento:
248                      DimValues[i] = pEngineChannel->ControllerTable[65];                      DimValues[i] = pChannel->ControllerTable[65];
249                      break;                      break;
250                  case ::gig::dimension_sostenutopedal:                  case ::gig::dimension_sostenutopedal:
251                      DimValues[i] = pEngineChannel->ControllerTable[66];                      DimValues[i] = pChannel->ControllerTable[66];
252                      break;                      break;
253                  case ::gig::dimension_softpedal:                  case ::gig::dimension_softpedal:
254                      DimValues[i] = pEngineChannel->ControllerTable[67];                      DimValues[i] = pChannel->ControllerTable[67];
255                      break;                      break;
256                  case ::gig::dimension_genpurpose5:                  case ::gig::dimension_genpurpose5:
257                      DimValues[i] = pEngineChannel->ControllerTable[80];                      DimValues[i] = pChannel->ControllerTable[80];
258                      break;                      break;
259                  case ::gig::dimension_genpurpose6:                  case ::gig::dimension_genpurpose6:
260                      DimValues[i] = pEngineChannel->ControllerTable[81];                      DimValues[i] = pChannel->ControllerTable[81];
261                      break;                      break;
262                  case ::gig::dimension_genpurpose7:                  case ::gig::dimension_genpurpose7:
263                      DimValues[i] = pEngineChannel->ControllerTable[82];                      DimValues[i] = pChannel->ControllerTable[82];
264                      break;                      break;
265                  case ::gig::dimension_genpurpose8:                  case ::gig::dimension_genpurpose8:
266                      DimValues[i] = pEngineChannel->ControllerTable[83];                      DimValues[i] = pChannel->ControllerTable[83];
267                      break;                      break;
268                  case ::gig::dimension_effect1depth:                  case ::gig::dimension_effect1depth:
269                      DimValues[i] = pEngineChannel->ControllerTable[91];                      DimValues[i] = pChannel->ControllerTable[91];
270                      break;                      break;
271                  case ::gig::dimension_effect2depth:                  case ::gig::dimension_effect2depth:
272                      DimValues[i] = pEngineChannel->ControllerTable[92];                      DimValues[i] = pChannel->ControllerTable[92];
273                      break;                      break;
274                  case ::gig::dimension_effect3depth:                  case ::gig::dimension_effect3depth:
275                      DimValues[i] = pEngineChannel->ControllerTable[93];                      DimValues[i] = pChannel->ControllerTable[93];
276                      break;                      break;
277                  case ::gig::dimension_effect4depth:                  case ::gig::dimension_effect4depth:
278                      DimValues[i] = pEngineChannel->ControllerTable[94];                      DimValues[i] = pChannel->ControllerTable[94];
279                      break;                      break;
280                  case ::gig::dimension_effect5depth:                  case ::gig::dimension_effect5depth:
281                      DimValues[i] = pEngineChannel->ControllerTable[95];                      DimValues[i] = pChannel->ControllerTable[95];
282                      break;                      break;
283                  case ::gig::dimension_none:                  case ::gig::dimension_none:
284                      std::cerr << "gig::Engine::LaunchVoice() Error: dimension=none\n" << std::flush;                      std::cerr << "gig::Engine::LaunchVoice() Error: dimension=none\n" << std::flush;
# Line 1348  namespace LinuxSampler { namespace gig { Line 300  namespace LinuxSampler { namespace gig {
300    
301          // allocate a new voice for the key          // allocate a new voice for the key
302          Pool<Voice>::Iterator itNewVoice = pKey->pActiveVoices->allocAppend();          Pool<Voice>::Iterator itNewVoice = pKey->pActiveVoices->allocAppend();
         if (itNewVoice) {  
             // launch the new voice  
             if (itNewVoice->Trigger(pEngineChannel, itNoteOnEvent, pEngineChannel->Pitch, pDimRgn, VoiceType, iKeyGroup) < 0) {  
                 dmsg(4,("Voice not triggered\n"));  
                 pKey->pActiveVoices->free(itNewVoice);  
             }  
             else { // on success  
                 --VoiceSpawnsLeft;  
                 if (!pKey->Active) { // mark as active key  
                     pKey->Active = true;  
                     pKey->itSelf = pEngineChannel->pActiveKeys->allocAppend();  
                     *pKey->itSelf = itNoteOnEvent->Param.Note.Key;  
                 }  
                 if (itNewVoice->KeyGroup) {  
                     uint** ppKeyGroup = &pEngineChannel->ActiveKeyGroups[itNewVoice->KeyGroup];  
                     *ppKeyGroup = &*pKey->itSelf; // put key as the (new) active key to its key group  
                 }  
                 if (itNewVoice->Type == Voice::type_release_trigger_required) pKey->ReleaseTrigger = true; // mark key for the need of release triggered voice(s)  
                 return itNewVoice; // success  
             }  
         }  
         else if (VoiceStealing) {  
             // try to steal one voice  
             int result = StealVoice(pEngineChannel, itNoteOnEvent);  
             if (!result) { // voice stolen successfully  
                 // put note-on event into voice-stealing queue, so it will be reprocessed after killed voice died  
                 RTList<Event>::Iterator itStealEvent = pVoiceStealingQueue->allocAppend();  
                 if (itStealEvent) {  
                     *itStealEvent = *itNoteOnEvent; // copy event  
                     itStealEvent->Param.Note.Layer = iLayer;  
                     itStealEvent->Param.Note.ReleaseTrigger = ReleaseTriggerVoice;  
                     pKey->VoiceTheftsQueued++;  
                 }  
                 else dmsg(1,("Voice stealing queue full!\n"));  
             }  
         }  
   
         return Pool<Voice>::Iterator(); // no free voice or error  
     }  
   
     /**  
      *  Will be called by LaunchVoice() method in case there are no free  
      *  voices left. This method will select and kill one old voice for  
      *  voice stealing and postpone the note-on event until the selected  
      *  voice actually died.  
      *  
      *  @param pEngineChannel - engine channel on which this event occured on  
      *  @param itNoteOnEvent - key, velocity and time stamp of the event  
      *  @returns 0 on success, a value < 0 if no active voice could be picked for voice stealing  
      */  
     int Engine::StealVoice(EngineChannel* pEngineChannel, Pool<Event>::Iterator& itNoteOnEvent) {  
         if (VoiceSpawnsLeft <= 0) {  
             dmsg(1,("Max. voice thefts per audio fragment reached (you may raise CONFIG_MAX_VOICES).\n"));  
             return -1;  
         }  
         if (!pEventPool->poolIsEmpty()) {  
   
             RTList<Voice>::Iterator itSelectedVoice;  
   
             // Select one voice for voice stealing  
             switch (CONFIG_VOICE_STEAL_ALGO) {  
   
                 // try to pick the oldest voice on the key where the new  
                 // voice should be spawned, if there is no voice on that  
                 // key, or no voice left to kill, then procceed with  
                 // 'oldestkey' algorithm  
                 case voice_steal_algo_oldestvoiceonkey: {  
                     midi_key_info_t* pSelectedKey = &pEngineChannel->pMIDIKeyInfo[itNoteOnEvent->Param.Note.Key];  
                     itSelectedVoice = pSelectedKey->pActiveVoices->first();  
                     // proceed iterating if voice was created in this fragment cycle  
                     while (itSelectedVoice && !itSelectedVoice->IsStealable()) ++itSelectedVoice;  
                     // if we haven't found a voice then proceed with algorithm 'oldestkey'  
                     if (itSelectedVoice && itSelectedVoice->IsStealable()) break;  
                 } // no break - intentional !  
   
                 // try to pick the oldest voice on the oldest active key  
                 // from the same engine channel  
                 // (caution: must stay after 'oldestvoiceonkey' algorithm !)  
                 case voice_steal_algo_oldestkey: {  
                     // if we already stole in this fragment, try to proceed on same key  
                     if (this->itLastStolenVoice) {  
                         itSelectedVoice = this->itLastStolenVoice;  
                         do {  
                             ++itSelectedVoice;  
                         } while (itSelectedVoice && !itSelectedVoice->IsStealable()); // proceed iterating if voice was created in this fragment cycle  
                         // found a "stealable" voice ?  
                         if (itSelectedVoice && itSelectedVoice->IsStealable()) {  
                             // remember which voice we stole, so we can simply proceed on next voice stealing  
                             this->itLastStolenVoice = itSelectedVoice;  
                             break; // selection succeeded  
                         }  
                     }  
                     // get (next) oldest key  
                     RTList<uint>::Iterator iuiSelectedKey = (this->iuiLastStolenKey) ? ++this->iuiLastStolenKey : pEngineChannel->pActiveKeys->first();  
                     while (iuiSelectedKey) {  
                         midi_key_info_t* pSelectedKey = &pEngineChannel->pMIDIKeyInfo[*iuiSelectedKey];  
                         itSelectedVoice = pSelectedKey->pActiveVoices->first();  
                         // proceed iterating if voice was created in this fragment cycle  
                         while (itSelectedVoice && !itSelectedVoice->IsStealable()) ++itSelectedVoice;  
                         // found a "stealable" voice ?  
                         if (itSelectedVoice && itSelectedVoice->IsStealable()) {  
                             // remember which voice on which key we stole, so we can simply proceed on next voice stealing  
                             this->iuiLastStolenKey  = iuiSelectedKey;  
                             this->itLastStolenVoice = itSelectedVoice;  
                             break; // selection succeeded  
                         }  
                         ++iuiSelectedKey; // get next oldest key  
                     }  
                     break;  
                 }  
   
                 // don't steal anything  
                 case voice_steal_algo_none:  
                 default: {  
                     dmsg(1,("No free voice (voice stealing disabled)!\n"));  
                     return -1;  
                 }  
             }  
   
             // if we couldn't steal a voice from the same engine channel then  
             // steal oldest voice on the oldest key from any other engine channel  
             // (the smaller engine channel number, the higher priority)  
             if (!itSelectedVoice || !itSelectedVoice->IsStealable()) {  
                 EngineChannel* pSelectedChannel;  
                 int            iChannelIndex;  
                 // select engine channel  
                 if (pLastStolenChannel) {  
                     pSelectedChannel = pLastStolenChannel;  
                     iChannelIndex    = pSelectedChannel->iEngineIndexSelf;  
                 } else { // pick the engine channel followed by this engine channel  
                     iChannelIndex    = (pEngineChannel->iEngineIndexSelf + 1) % engineChannels.size();  
                     pSelectedChannel = engineChannels[iChannelIndex];  
                 }  
   
                 // if we already stole in this fragment, try to proceed on same key  
                 if (this->itLastStolenVoiceGlobally) {  
                     itSelectedVoice = this->itLastStolenVoiceGlobally;  
                     do {  
                         ++itSelectedVoice;  
                     } while (itSelectedVoice && !itSelectedVoice->IsStealable()); // proceed iterating if voice was created in this fragment cycle  
                 }  
   
                 #if CONFIG_DEVMODE  
                 EngineChannel* pBegin = pSelectedChannel; // to detect endless loop  
                 #endif // CONFIG_DEVMODE  
   
                 // did we find a 'stealable' voice?  
                 if (itSelectedVoice && itSelectedVoice->IsStealable()) {  
                     // remember which voice we stole, so we can simply proceed on next voice stealing  
                     this->itLastStolenVoiceGlobally = itSelectedVoice;  
                 } else while (true) { // iterate through engine channels  
                     // get (next) oldest key  
                     RTList<uint>::Iterator iuiSelectedKey = (this->iuiLastStolenKeyGlobally) ? ++this->iuiLastStolenKeyGlobally : pSelectedChannel->pActiveKeys->first();  
                     this->iuiLastStolenKeyGlobally = RTList<uint>::Iterator(); // to prevent endless loop (see line above)  
                     while (iuiSelectedKey) {  
                         midi_key_info_t* pSelectedKey = &pSelectedChannel->pMIDIKeyInfo[*iuiSelectedKey];  
                         itSelectedVoice = pSelectedKey->pActiveVoices->first();  
                         // proceed iterating if voice was created in this fragment cycle  
                         while (itSelectedVoice && !itSelectedVoice->IsStealable()) ++itSelectedVoice;  
                         // found a "stealable" voice ?  
                         if (itSelectedVoice && itSelectedVoice->IsStealable()) {  
                             // remember which voice on which key on which engine channel we stole, so we can simply proceed on next voice stealing  
                             this->iuiLastStolenKeyGlobally  = iuiSelectedKey;  
                             this->itLastStolenVoiceGlobally = itSelectedVoice;  
                             this->pLastStolenChannel        = pSelectedChannel;  
                             goto stealable_voice_found; // selection succeeded  
                         }  
                         ++iuiSelectedKey; // get next key on current engine channel  
                     }  
                     // get next engine channel  
                     iChannelIndex    = (iChannelIndex + 1) % engineChannels.size();  
                     pSelectedChannel = engineChannels[iChannelIndex];  
   
                     #if CONFIG_DEVMODE  
                     if (pSelectedChannel == pBegin) {  
                         dmsg(1,("FATAL ERROR: voice stealing endless loop!\n"));  
                         dmsg(1,("VoiceSpawnsLeft=%d.\n", VoiceSpawnsLeft));  
                         dmsg(1,("Exiting.\n"));  
                         exit(-1);  
                     }  
                     #endif // CONFIG_DEVMODE  
                 }  
             }  
   
             // jump point if a 'stealable' voice was found  
             stealable_voice_found:  
   
             #if CONFIG_DEVMODE  
             if (!itSelectedVoice->IsActive()) {  
                 dmsg(1,("gig::Engine: ERROR, tried to steal a voice which was not active !!!\n"));  
                 return -1;  
             }  
             #endif // CONFIG_DEVMODE  
   
             // now kill the selected voice  
             itSelectedVoice->Kill(itNoteOnEvent);  
   
             --VoiceSpawnsLeft;  
   
             return 0; // success  
         }  
         else {  
             dmsg(1,("Event pool emtpy!\n"));  
             return -1;  
         }  
     }  
   
     /**  
      *  Removes the given voice from the MIDI key's list of active voices.  
      *  This method will be called when a voice went inactive, e.g. because  
      *  it finished to playback its sample, finished its release stage or  
      *  just was killed.  
      *  
      *  @param pEngineChannel - engine channel on which this event occured on  
      *  @param itVoice - points to the voice to be freed  
      */  
     void Engine::FreeVoice(EngineChannel* pEngineChannel, Pool<Voice>::Iterator& itVoice) {  
         if (itVoice) {  
             midi_key_info_t* pKey = &pEngineChannel->pMIDIKeyInfo[itVoice->MIDIKey];  
   
             uint keygroup = itVoice->KeyGroup;  
   
             // if the sample and dimension region belong to an  
             // instrument that is unloaded, tell the disk thread to  
             // release them  
             if (itVoice->Orphan) {  
                 pDiskThread->OrderDeletionOfDimreg(itVoice->pDimRgn);  
             }  
   
             // free the voice object  
             pVoicePool->free(itVoice);  
   
             // if no other voices left and member of a key group, remove from key group  
             if (pKey->pActiveVoices->isEmpty() && keygroup) {  
                 uint** ppKeyGroup = &pEngineChannel->ActiveKeyGroups[keygroup];  
                 if (*ppKeyGroup == &*pKey->itSelf) *ppKeyGroup = NULL; // remove key from key group  
             }  
         }  
         else std::cerr << "Couldn't release voice! (!itVoice)\n" << std::flush;  
     }  
   
     /**  
      *  Called when there's no more voice left on a key, this call will  
      *  update the key info respectively.  
      *  
      *  @param pEngineChannel - engine channel on which this event occured on  
      *  @param pKey - key which is now inactive  
      */  
     void Engine::FreeKey(EngineChannel* pEngineChannel, midi_key_info_t* pKey) {  
         if (pKey->pActiveVoices->isEmpty()) {  
             pKey->Active = false;  
             pEngineChannel->pActiveKeys->free(pKey->itSelf); // remove key from list of active keys  
             pKey->itSelf = RTList<uint>::Iterator();  
             pKey->ReleaseTrigger = false;  
             pKey->pEvents->clear();  
             dmsg(3,("Key has no more voices now\n"));  
         }  
         else dmsg(1,("gig::Engine: Oops, tried to free a key which contains voices.\n"));  
     }  
   
     /**  
      *  Reacts on supported control change commands (e.g. pitch bend wheel,  
      *  modulation wheel, aftertouch).  
      *  
      *  @param pEngineChannel - engine channel on which this event occured on  
      *  @param itControlChangeEvent - controller, value and time stamp of the event  
      */  
     void Engine::ProcessControlChange(EngineChannel* pEngineChannel, Pool<Event>::Iterator& itControlChangeEvent) {  
         dmsg(4,("Engine::ContinuousController cc=%d v=%d\n", itControlChangeEvent->Param.CC.Controller, itControlChangeEvent->Param.CC.Value));  
   
         // handle the "control triggered" MIDI rule: a control change  
         // event can trigger a new note on or note off event  
         if (pEngineChannel->pInstrument) {  
   
             ::gig::MidiRule* rule;  
             for (int i = 0 ; (rule = pEngineChannel->pInstrument->GetMidiRule(i)) ; i++) {  
   
                 if (::gig::MidiRuleCtrlTrigger* ctrlTrigger =  
                     dynamic_cast< ::gig::MidiRuleCtrlTrigger*>(rule)) {  
                     if (itControlChangeEvent->Param.CC.Controller ==  
                         ctrlTrigger->ControllerNumber) {  
   
                         uint8_t oldCCValue = pEngineChannel->ControllerTable[  
                             itControlChangeEvent->Param.CC.Controller];  
                         uint8_t newCCValue = itControlChangeEvent->Param.CC.Value;  
   
                         for (int i = 0 ; i < ctrlTrigger->Triggers ; i++) {  
                             ::gig::MidiRuleCtrlTrigger::trigger_t* pTrigger =  
                                   &ctrlTrigger->pTriggers[i];  
   
                             // check if the controller has passed the  
                             // trigger point in the right direction  
                             if ((pTrigger->Descending &&  
                                  oldCCValue > pTrigger->TriggerPoint &&  
                                  newCCValue <= pTrigger->TriggerPoint) ||  
                                 (!pTrigger->Descending &&  
                                  oldCCValue < pTrigger->TriggerPoint &&  
                                  newCCValue >= pTrigger->TriggerPoint)) {  
   
                                 RTList<Event>::Iterator itNewEvent = pGlobalEvents->allocAppend();  
                                 if (itNewEvent) {  
                                     *itNewEvent = *itControlChangeEvent;  
                                     itNewEvent->Param.Note.Key = pTrigger->Key;  
   
                                     if (pTrigger->NoteOff || pTrigger->Velocity == 0) {  
                                         itNewEvent->Type = Event::type_note_off;  
                                         itNewEvent->Param.Note.Velocity = 100;  
   
                                         ProcessNoteOff(pEngineChannel, itNewEvent);  
                                     } else {  
                                         itNewEvent->Type = Event::type_note_on;  
                                         //TODO: if Velocity is 255, the triggered velocity should  
                                         // depend on how fast the controller is moving  
                                         itNewEvent->Param.Note.Velocity =  
                                             pTrigger->Velocity == 255 ? 100 :  
                                             pTrigger->Velocity;  
   
                                         ProcessNoteOn(pEngineChannel, itNewEvent);  
                                     }  
                                 }  
                                 else dmsg(1,("Event pool emtpy!\n"));  
                             }  
                         }  
                     }  
                 }  
             }  
         }  
   
         // update controller value in the engine channel's controller table  
         pEngineChannel->ControllerTable[itControlChangeEvent->Param.CC.Controller] = itControlChangeEvent->Param.CC.Value;  
   
         // handle hard coded MIDI controllers  
         switch (itControlChangeEvent->Param.CC.Controller) {  
             case 5: { // portamento time  
                 pEngineChannel->PortamentoTime = (float) itControlChangeEvent->Param.CC.Value / 127.0f * (float) CONFIG_PORTAMENTO_TIME_MAX + (float) CONFIG_PORTAMENTO_TIME_MIN;  
                 break;  
             }  
             case 6: { // data entry (currently only used for RPN controllers)  
                 if (pEngineChannel->GetMidiRpnController() == 2) { // coarse tuning in half tones  
                     int transpose = (int) itControlChangeEvent->Param.CC.Value - 64;  
                     // limit to +- two octaves for now  
                     transpose = RTMath::Min(transpose,  24);  
                     transpose = RTMath::Max(transpose, -24);  
                     pEngineChannel->GlobalTranspose = transpose;  
                     // workaround, so we won't have hanging notes  
                     ReleaseAllVoices(pEngineChannel, itControlChangeEvent);  
                 }  
                 // to avoid other MIDI CC #6 messages to be misenterpreted as RPN controller data  
                 pEngineChannel->ResetMidiRpnController();  
                 break;  
             }  
             case 7: { // volume  
                 //TODO: not sample accurate yet  
                 pEngineChannel->MidiVolume = VolumeCurve[itControlChangeEvent->Param.CC.Value];  
                 pEngineChannel->bStatusChanged = true; // engine channel status has changed, so set notify flag  
                 break;  
             }  
             case 10: { // panpot  
                 //TODO: not sample accurate yet  
                 pEngineChannel->GlobalPanLeft  = PanCurve[128 - itControlChangeEvent->Param.CC.Value];  
                 pEngineChannel->GlobalPanRight = PanCurve[itControlChangeEvent->Param.CC.Value];  
                 break;  
             }  
             case 64: { // sustain  
                 if (itControlChangeEvent->Param.CC.Value >= 64 && !pEngineChannel->SustainPedal) {  
                     dmsg(4,("DAMPER (RIGHT) PEDAL DOWN\n"));  
                     pEngineChannel->SustainPedal = true;  
   
                     #if !CONFIG_PROCESS_MUTED_CHANNELS  
                     if (pEngineChannel->GetMute()) return; // skip if sampler channel is muted  
                     #endif  
   
                     // cancel release process of voices if necessary  
                     RTList<uint>::Iterator iuiKey = pEngineChannel->pActiveKeys->first();  
                     for (; iuiKey; ++iuiKey) {  
                         midi_key_info_t* pKey = &pEngineChannel->pMIDIKeyInfo[*iuiKey];  
                         if (!pKey->KeyPressed) {  
                             RTList<Event>::Iterator itNewEvent = pKey->pEvents->allocAppend();  
                             if (itNewEvent) {  
                                 *itNewEvent = *itControlChangeEvent; // copy event to the key's own event list  
                                 itNewEvent->Type = Event::type_cancel_release; // transform event type  
                             }  
                             else dmsg(1,("Event pool emtpy!\n"));  
                         }  
                     }  
                 }  
                 if (itControlChangeEvent->Param.CC.Value < 64 && pEngineChannel->SustainPedal) {  
                     dmsg(4,("DAMPER (RIGHT) PEDAL UP\n"));  
                     pEngineChannel->SustainPedal = false;  
   
                     #if !CONFIG_PROCESS_MUTED_CHANNELS  
                     if (pEngineChannel->GetMute()) return; // skip if sampler channel is muted  
                     #endif  
   
                     // release voices if their respective key is not pressed  
                     RTList<uint>::Iterator iuiKey = pEngineChannel->pActiveKeys->first();  
                     for (; iuiKey; ++iuiKey) {  
                         midi_key_info_t* pKey = &pEngineChannel->pMIDIKeyInfo[*iuiKey];  
                         if (!pKey->KeyPressed && ShouldReleaseVoice(pEngineChannel, *iuiKey)) {  
                             RTList<Event>::Iterator itNewEvent = pKey->pEvents->allocAppend();  
                             if (itNewEvent) {  
                                 *itNewEvent = *itControlChangeEvent; // copy event to the key's own event list  
                                 itNewEvent->Type = Event::type_release; // transform event type  
                             }  
                             else dmsg(1,("Event pool emtpy!\n"));  
                         }  
                     }  
                 }  
                 break;  
             }  
             case 65: { // portamento on / off  
                 const bool bPortamento = itControlChangeEvent->Param.CC.Value >= 64;  
                 if (bPortamento != pEngineChannel->PortamentoMode)  
                     KillAllVoices(pEngineChannel, itControlChangeEvent);  
                 pEngineChannel->PortamentoMode = bPortamento;  
                 break;  
             }  
             case 66: { // sostenuto  
                 if (itControlChangeEvent->Param.CC.Value >= 64 && !pEngineChannel->SostenutoPedal) {  
                     dmsg(4,("SOSTENUTO (CENTER) PEDAL DOWN\n"));  
                     pEngineChannel->SostenutoPedal = true;  
   
                     #if !CONFIG_PROCESS_MUTED_CHANNELS  
                     if (pEngineChannel->GetMute()) return; // skip if sampler channel is muted  
                     #endif  
   
                     SostenutoKeyCount = 0;  
                     // Remeber the pressed keys  
                     RTList<uint>::Iterator iuiKey = pEngineChannel->pActiveKeys->first();  
                     for (; iuiKey; ++iuiKey) {  
                         midi_key_info_t* pKey = &pEngineChannel->pMIDIKeyInfo[*iuiKey];  
                         if (pKey->KeyPressed && SostenutoKeyCount < 128) SostenutoKeys[SostenutoKeyCount++] = *iuiKey;  
                     }  
                 }  
                 if (itControlChangeEvent->Param.CC.Value < 64 && pEngineChannel->SostenutoPedal) {  
                     dmsg(4,("SOSTENUTO (CENTER) PEDAL UP\n"));  
                     pEngineChannel->SostenutoPedal = false;  
   
                     #if !CONFIG_PROCESS_MUTED_CHANNELS  
                     if (pEngineChannel->GetMute()) return; // skip if sampler channel is muted  
                     #endif  
   
                     // release voices if the damper pedal is up and their respective key is not pressed  
                     for (int i = 0; i < SostenutoKeyCount; i++) {  
                         midi_key_info_t* pKey = &pEngineChannel->pMIDIKeyInfo[SostenutoKeys[i]];  
                         if (!pKey->KeyPressed && !pEngineChannel->SustainPedal) {  
                             RTList<Event>::Iterator itNewEvent = pKey->pEvents->allocAppend();  
                             if (itNewEvent) {  
                                 *itNewEvent = *itControlChangeEvent; // copy event to the key's own event list  
                                 itNewEvent->Type = Event::type_release; // transform event type  
                             }  
                             else dmsg(1,("Event pool emtpy!\n"));  
                         }  
                     }  
                 }  
                 break;  
             }  
             case 100: { // RPN controller LSB  
                 pEngineChannel->SetMidiRpnControllerLsb(itControlChangeEvent->Param.CC.Value);  
                 break;  
             }  
             case 101: { // RPN controller MSB  
                 pEngineChannel->SetMidiRpnControllerMsb(itControlChangeEvent->Param.CC.Value);  
                 break;  
             }  
   
   
             // Channel Mode Messages  
   
             case 120: { // all sound off  
                 KillAllVoices(pEngineChannel, itControlChangeEvent);  
                 break;  
             }  
             case 121: { // reset all controllers  
                 pEngineChannel->ResetControllers();  
                 break;  
             }  
             case 123: { // all notes off  
                 #if CONFIG_PROCESS_ALL_NOTES_OFF  
                 ReleaseAllVoices(pEngineChannel, itControlChangeEvent);  
                 #endif // CONFIG_PROCESS_ALL_NOTES_OFF  
                 break;  
             }  
             case 126: { // mono mode on  
                 if (!pEngineChannel->SoloMode)  
                     KillAllVoices(pEngineChannel, itControlChangeEvent);  
                 pEngineChannel->SoloMode = true;  
                 break;  
             }  
             case 127: { // poly mode on  
                 if (pEngineChannel->SoloMode)  
                     KillAllVoices(pEngineChannel, itControlChangeEvent);  
                 pEngineChannel->SoloMode = false;  
                 break;  
             }  
         }  
   
         // handle FX send controllers  
         if (!pEngineChannel->fxSends.empty()) {  
             for (int iFxSend = 0; iFxSend < pEngineChannel->GetFxSendCount(); iFxSend++) {  
                 FxSend* pFxSend = pEngineChannel->GetFxSend(iFxSend);  
                 if (pFxSend->MidiController() == itControlChangeEvent->Param.CC.Controller)  
                     pFxSend->SetLevel(itControlChangeEvent->Param.CC.Value);  
                     pFxSend->SetInfoChanged(true);  
             }  
         }  
     }  
   
     /**  
      *  Reacts on MIDI system exclusive messages.  
      *  
      *  @param itSysexEvent - sysex data size and time stamp of the sysex event  
      */  
     void Engine::ProcessSysex(Pool<Event>::Iterator& itSysexEvent) {  
         RingBuffer<uint8_t,false>::NonVolatileReader reader = pSysexBuffer->get_non_volatile_reader();  
   
         uint8_t exclusive_status, id;  
         if (!reader.pop(&exclusive_status)) goto free_sysex_data;  
         if (!reader.pop(&id))               goto free_sysex_data;  
         if (exclusive_status != 0xF0)       goto free_sysex_data;  
   
         switch (id) {  
             case 0x41: { // Roland  
                 dmsg(3,("Roland Sysex\n"));  
                 uint8_t device_id, model_id, cmd_id;  
                 if (!reader.pop(&device_id)) goto free_sysex_data;  
                 if (!reader.pop(&model_id))  goto free_sysex_data;  
                 if (!reader.pop(&cmd_id))    goto free_sysex_data;  
                 if (model_id != 0x42 /*GS*/) goto free_sysex_data;  
                 if (cmd_id != 0x12 /*DT1*/)  goto free_sysex_data;  
   
                 // command address  
                 uint8_t addr[3]; // 2 byte addr MSB, followed by 1 byte addr LSB)  
                 const RingBuffer<uint8_t,false>::NonVolatileReader checksum_reader = reader; // so we can calculate the check sum later  
                 if (reader.read(&addr[0], 3) != 3) goto free_sysex_data;  
                 if (addr[0] == 0x40 && addr[1] == 0x00) { // System Parameters  
                     dmsg(3,("\tSystem Parameter\n"));  
                 }  
                 else if (addr[0] == 0x40 && addr[1] == 0x01) { // Common Parameters  
                     dmsg(3,("\tCommon Parameter\n"));  
                 }  
                 else if (addr[0] == 0x40 && (addr[1] & 0xf0) == 0x10) { // Part Parameters (1)  
                     dmsg(3,("\tPart Parameter\n"));  
                     switch (addr[2]) {  
                         case 0x40: { // scale tuning  
                             dmsg(3,("\t\tScale Tuning\n"));  
                             uint8_t scale_tunes[12]; // detuning of all 12 semitones of an octave  
                             if (reader.read(&scale_tunes[0], 12) != 12) goto free_sysex_data;  
                             uint8_t checksum;  
                             if (!reader.pop(&checksum)) goto free_sysex_data;  
                             #if CONFIG_ASSERT_GS_SYSEX_CHECKSUM  
                             if (GSCheckSum(checksum_reader, 12)) goto free_sysex_data;  
                             #endif // CONFIG_ASSERT_GS_SYSEX_CHECKSUM  
                             for (int i = 0; i < 12; i++) scale_tunes[i] -= 64;  
                             AdjustScale((int8_t*) scale_tunes);  
                             dmsg(3,("\t\t\tNew scale applied.\n"));  
                             break;  
                         }  
                     }  
                 }  
                 else if (addr[0] == 0x40 && (addr[1] & 0xf0) == 0x20) { // Part Parameters (2)  
                 }  
                 else if (addr[0] == 0x41) { // Drum Setup Parameters  
                 }  
                 break;  
             }  
         }  
303    
304          free_sysex_data: // finally free sysex data          int res = InitNewVoice (
305          pSysexBuffer->increment_read_ptr(itSysexEvent->Param.Sysex.Size);                  pChannel, pDimRgn, itNoteOnEvent, VoiceType, iLayer,
306      }                  iKeyGroup, ReleaseTriggerVoice, VoiceStealing, itNewVoice
307            );
308            if (!res) return itNewVoice;
309    
310      /**          return Pool<Voice>::Iterator(); // no free voice or error
      * Calculates the Roland GS sysex check sum.  
      *  
      * @param AddrReader - reader which currently points to the first GS  
      *                     command address byte of the GS sysex message in  
      *                     question  
      * @param DataSize   - size of the GS message data (in bytes)  
      */  
     uint8_t Engine::GSCheckSum(const RingBuffer<uint8_t,false>::NonVolatileReader AddrReader, uint DataSize) {  
         RingBuffer<uint8_t,false>::NonVolatileReader reader = AddrReader;  
         uint bytes = 3 /*addr*/ + DataSize;  
         uint8_t addr_and_data[bytes];  
         reader.read(&addr_and_data[0], bytes);  
         uint8_t sum = 0;  
         for (uint i = 0; i < bytes; i++) sum += addr_and_data[i];  
         return 128 - sum % 128;  
     }  
   
     /**  
      * Allows to tune each of the twelve semitones of an octave.  
      *  
      * @param ScaleTunes - detuning of all twelve semitones (in cents)  
      */  
     void Engine::AdjustScale(int8_t ScaleTunes[12]) {  
         memcpy(&this->ScaleTuning[0], &ScaleTunes[0], 12); //TODO: currently not sample accurate  
     }  
   
     /**  
      * Releases all voices on an engine channel. All voices will go into  
      * the release stage and thus it might take some time (e.g. dependant to  
      * their envelope release time) until they actually die.  
      *  
      * @param pEngineChannel - engine channel on which all voices should be released  
      * @param itReleaseEvent - event which caused this releasing of all voices  
      */  
     void Engine::ReleaseAllVoices(EngineChannel* pEngineChannel, Pool<Event>::Iterator& itReleaseEvent) {  
         RTList<uint>::Iterator iuiKey = pEngineChannel->pActiveKeys->first();  
         while (iuiKey) {  
             midi_key_info_t* pKey = &pEngineChannel->pMIDIKeyInfo[*iuiKey];  
             ++iuiKey;  
             // append a 'release' event to the key's own event list  
             RTList<Event>::Iterator itNewEvent = pKey->pEvents->allocAppend();  
             if (itNewEvent) {  
                 *itNewEvent = *itReleaseEvent; // copy original event (to the key's event list)  
                 itNewEvent->Type = Event::type_release; // transform event type  
             }  
             else dmsg(1,("Event pool emtpy!\n"));  
         }  
     }  
   
     /**  
      * Kills all voices on an engine channel as soon as possible. Voices  
      * won't get into release state, their volume level will be ramped down  
      * as fast as possible.  
      *  
      * @param pEngineChannel - engine channel on which all voices should be killed  
      * @param itKillEvent    - event which caused this killing of all voices  
      */  
     void Engine::KillAllVoices(EngineChannel* pEngineChannel, Pool<Event>::Iterator& itKillEvent) {  
         RTList<uint>::Iterator iuiKey = pEngineChannel->pActiveKeys->first();  
         RTList<uint>::Iterator end    = pEngineChannel->pActiveKeys->end();  
         while (iuiKey != end) { // iterate through all active keys  
             midi_key_info_t* pKey = &pEngineChannel->pMIDIKeyInfo[*iuiKey];  
             ++iuiKey;  
             RTList<Voice>::Iterator itVoice     = pKey->pActiveVoices->first();  
             RTList<Voice>::Iterator itVoicesEnd = pKey->pActiveVoices->end();  
             for (; itVoice != itVoicesEnd; ++itVoice) { // iterate through all voices on this key  
                 itVoice->Kill(itKillEvent);  
                 --VoiceSpawnsLeft; //FIXME: just a temporary workaround, we should check the cause in StealVoice() instead  
             }  
         }  
     }  
   
     /**  
      * Determines whether the specified voice should be released.  
      *  
      * @param pEngineChannel - The engine channel on which the voice should be checked  
      * @param Key - The key number  
      * @returns true if the specified should be released, false otherwise.  
      */  
     bool Engine::ShouldReleaseVoice(EngineChannel* pEngineChannel, int Key) {  
         if (pEngineChannel->SustainPedal) return false;  
   
         if (pEngineChannel->SostenutoPedal) {  
             for (int i = 0; i < SostenutoKeyCount; i++)  
                 if (Key == SostenutoKeys[i]) return false;  
         }  
   
         return true;  
     }  
   
     uint Engine::VoiceCount() {  
         return ActiveVoiceCount;  
     }  
   
     uint Engine::VoiceCountMax() {  
         return ActiveVoiceCountMax;  
311      }      }
312    
313      bool Engine::DiskStreamSupported() {      bool Engine::DiskStreamSupported() {
314          return true;          return true;
315      }      }
316    
     uint Engine::DiskStreamCount() {  
         return (pDiskThread) ? pDiskThread->ActiveStreamCount : 0;  
     }  
   
     uint Engine::DiskStreamCountMax() {  
         return (pDiskThread) ? pDiskThread->ActiveStreamCountMax : 0;  
     }  
   
     String Engine::DiskStreamBufferFillBytes() {  
         return pDiskThread->GetBufferFillBytes();  
     }  
   
     String Engine::DiskStreamBufferFillPercentage() {  
         return pDiskThread->GetBufferFillPercentage();  
     }  
   
     String Engine::EngineName() {  
         return LS_GIG_ENGINE_NAME;  
     }  
   
317      String Engine::Description() {      String Engine::Description() {
318          return "Gigasampler Format Engine";          return "GigaSampler Format Engine";
319      }      }
320    
321      String Engine::Version() {      String Engine::Version() {
322          String s = "$Revision: 1.88 $";          String s = "$Revision: 1.108 $";
323          return s.substr(11, s.size() - 13); // cut dollar signs, spaces and CVS macro keyword          return s.substr(11, s.size() - 13); // cut dollar signs, spaces and CVS macro keyword
324      }      }
325    
     InstrumentManager* Engine::GetInstrumentManager() {  
         return &instruments;  
     }  
   
     // static constant initializers  
     const Engine::FloatTable Engine::VolumeCurve(InitVolumeCurve());  
     const Engine::FloatTable Engine::PanCurve(InitPanCurve());  
     const Engine::FloatTable Engine::CrossfadeCurve(InitCrossfadeCurve());  
   
     float* Engine::InitVolumeCurve() {  
         // line-segment approximation  
         const float segments[] = {  
             0, 0, 2, 0.0046, 16, 0.016, 31, 0.051, 45, 0.115, 54.5, 0.2,  
             64.5, 0.39, 74, 0.74, 92, 1.03, 114, 1.94, 119.2, 2.2, 127, 2.2  
         };  
         return InitCurve(segments);  
     }  
   
     float* Engine::InitPanCurve() {  
         // line-segment approximation  
         const float segments[] = {  
             0, 0, 1, 0,  
             2, 0.05, 31.5, 0.7, 51, 0.851, 74.5, 1.12,  
             127, 1.41, 128, 1.41  
         };  
         return InitCurve(segments, 129);  
     }  
   
     float* Engine::InitCrossfadeCurve() {  
         // line-segment approximation  
         const float segments[] = {  
             0, 0, 1, 0.03, 10, 0.1, 51, 0.58, 127, 1  
         };  
         return InitCurve(segments);  
     }  
   
     float* Engine::InitCurve(const float* segments, int size) {  
         float* y = new float[size];  
         for (int x = 0 ; x < size ; x++) {  
             if (x > segments[2]) segments += 2;  
             y[x] = segments[1] + (x - segments[0]) *  
                 (segments[3] - segments[1]) / (segments[2] - segments[0]);  
         }  
         return y;  
     }  
   
326  }} // namespace LinuxSampler::gig  }} // namespace LinuxSampler::gig
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