/[svn]/linuxsampler/trunk/src/engines/gig/Engine.cpp
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revision 1043 by schoenebeck, Wed Feb 7 21:02:04 2007 UTC revision 2565 by schoenebeck, Tue May 20 12:21:39 2014 UTC
# Line 2  Line 2 
2   *                                                                         *   *                                                                         *
3   *   LinuxSampler - modular, streaming capable sampler                     *   *   LinuxSampler - modular, streaming capable sampler                     *
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) 2005-2007 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"
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 wil 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() {  
         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);  
         pDimRegionsInUse   = new ::gig::DimensionRegion*[CONFIG_MAX_VOICES + 1];  
         pVoiceStealingQueue = new RTList<Event>(pEventPool);  
         pGlobalEvents      = new RTList<Event>(pEventPool);  
         InstrumentChangeQueue      = new RingBuffer<instrument_change_command_t,false>(1, 0);  
         InstrumentChangeReplyQueue = new RingBuffer<instrument_change_reply_t,false>(1, 0);  
   
         for (RTList<Voice>::Iterator iterVoice = pVoicePool->allocAppend(); iterVoice == pVoicePool->last(); iterVoice = pVoicePool->allocAppend()) {  
             iterVoice->SetEngine(this);  
         }  
         pVoicePool->clear();  
   
         ResetInternal();  
         ResetScaleTuning();  
     }  
   
     /**  
      * 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;  
         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()));  
     }  
   
     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"));  
     }  
   
     /**  
      *  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).  
      */  
     void Engine::ResetScaleTuning() {  
         memset(&ScaleTuning[0], 0x00, 12);  
     }  
   
     /**  
      * Connect this engine instance with the given audio output device.  
      * 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;  
   
         ResetInternal();  
   
         // inform audio driver for the need of two channels  
         try {  
             pAudioOutputDevice->AcquireChannels(2); // gig engine only stereo  
         }  
         catch (AudioOutputException e) {  
             String msg = "Audio output device unable to provide 2 audio channels, cause: " + e.Message();  
             throw Exception(msg);  
         }  
   
         this->MaxSamplesPerCycle = pAudioOutputDevice->MaxSamplesPerCycle();  
         this->SampleRate         = pAudioOutputDevice->SampleRate();  
   
         // FIXME: audio drivers with varying fragment sizes might be a problem here  
         MaxFadeOutPos = MaxSamplesPerCycle - int(double(SampleRate) * CONFIG_EG_MIN_RELEASE_TIME) - 1;  
         if (MaxFadeOutPos < 0) {  
             std::cerr << "gig::Engine: WARNING, CONFIG_EG_MIN_RELEASE_TIME "  
                       << "too big for current audio fragment size & sampling rate! "  
                       << "May lead to click sounds if voice stealing chimes in!\n" << std::flush;  
             // force volume ramp downs at the beginning of each fragment  
             MaxFadeOutPos = 0;  
             // 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();  
         }  
   
         // (re)create disk thread  
         if (this->pDiskThread) {  
             dmsg(1,("Stopping disk thread..."));  
             this->pDiskThread->StopThread();  
             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);  
         }  
   
         for (RTList<Voice>::Iterator iterVoice = pVoicePool->allocAppend(); iterVoice == pVoicePool->last(); iterVoice = pVoicePool->allocAppend()) {  
             iterVoice->pDiskThread = this->pDiskThread;  
             dmsg(3,("d"));  
         }  
         pVoicePool->clear();  
   
         // (re)create event generator  
         if (pEventGenerator) delete pEventGenerator;  
         pEventGenerator = new EventGenerator(pAudioOut->SampleRate());  
   
         dmsg(1,("Starting disk thread..."));  
         pDiskThread->StartThread();  
         dmsg(1,("OK\n"));  
   
         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);  
             }  
         }  
     }  
   
     /**  
      * 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  
     }  
30    
31      /**      /**
32       * Let this engine proceed to render the given amount of sample points.       *  Reacts on supported control change commands (e.g. pitch bend wheel,
33       * The engine will iterate through all engine channels and render audio       *  modulation wheel, aftertouch).
      * 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(7,("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;  
         }  
   
         // 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  
         instrument_change_command_t command;  
         if (InstrumentChangeQueue->pop(&command) > 0) {  
             EngineChannel* pEngineChannel = command.pEngineChannel;  
             pEngineChannel->pInstrument = command.pInstrument;  
   
             // iterate through all active voices and mark their  
             // dimension regions as "in use". The instrument resource  
             // manager may delete all of the instrument except the  
             // dimension regions and samples that are in use.  
             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  
                     if (!itVoice->Orphan) {  
                         itVoice->Orphan = true;  
                         pDimRegionsInUse[i++] = itVoice->pDimRgn;  
                     }  
                 }  
             }  
             pDimRegionsInUse[i] = 0; // end of list  
   
             // send a reply to the calling thread, which is waiting  
             instrument_change_reply_t reply;  
             InstrumentChangeReplyQueue->push(&reply);  
         }  
   
         // 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;  
   
         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  
   
         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()) ActiveVoiceCountTemp++; // still active  
                 else { // voice reached end, is now inactive  
                     FreeVoice(pEngineChannel, itVoice); // remove voice from the list of active voices  
                 }  
             }  
         }  
     }  
   
     /**  
      * 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()) ActiveVoiceCountTemp++; // still active  
                 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"));  
   
             // we need to clear the key's event list explicitly here in case key was never active  
             midi_key_info_t* pKey = &pEngineChannel->pMIDIKeyInfo[itVoiceStealEvent->Param.Note.Key];  
             pKey->VoiceTheftsQueued--;  
             if (!pKey->Active && !pKey->VoiceTheftsQueued) pKey->pEvents->clear();  
         }  
     }  
   
     /**  
      * Will be called in case the respective engine channel sports FX send  
      * channels. In this particular case, engine channel local buffers are  
      * used to render and mix all voices to. This method is responsible for  
      * copying the audio data from those local buffers to the master audio  
      * output channels as well as to the FX send audio output channels with  
      * their respective FX send levels.  
      *  
      * @param pEngineChannel - engine channel from which audio should be  
      *                         routed  
      * @param Samples        - amount of sample points to be routed in  
      *                         this audio fragment cycle  
      */  
     void Engine::RouteAudio(EngineChannel* pEngineChannel, uint Samples) {  
         // route master signal  
         {  
             AudioChannel* pDstL = pAudioOutputDevice->Channel(pEngineChannel->AudioDeviceChannelLeft);  
             AudioChannel* pDstR = pAudioOutputDevice->Channel(pEngineChannel->AudioDeviceChannelRight);  
             pEngineChannel->pChannelLeft->MixTo(pDstL, Samples);  
             pEngineChannel->pChannelRight->MixTo(pDstR, Samples);  
         }  
         // 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();  
     }  
   
     /**  
      * Free all keys which have turned inactive in this audio fragment, from  
      * the list of active keys and clear all event lists on that engine  
      * channel.  
      *  
      * @param pEngineChannel - engine channel to cleanup  
      */  
     void Engine::PostProcess(EngineChannel* pEngineChannel) {  
         // free all keys which have no active voices left  
         {  
             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;  
                 if (pKey->pActiveVoices->isEmpty()) FreeKey(pEngineChannel, pKey);  
                 #if CONFIG_DEVMODE  
                 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  
             }  
         }  
   
         // empty the engine channel's own event lists  
         pEngineChannel->ClearEventLists();  
     }  
   
     /**  
      *  Will be called by the MIDI input device whenever a MIDI system  
      *  exclusive message has arrived.  
      *  
      *  @param pData - pointer to sysex data  
      *  @param Size  - lenght of sysex data (in bytes)  
      */  
     void Engine::SendSysex(void* pData, uint Size) {  
         Event event             = pEventGenerator->CreateEvent();  
         event.Type              = Event::type_sysex;  
         event.Param.Sysex.Size  = Size;  
         event.pEngineChannel    = NULL; // as Engine global event  
         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.  
34       *       *
35       *  @param pEngineChannel - engine channel on which this event occured on       *  @param pEngineChannel - engine channel on which this event occured on
36       *  @param itNoteOnEvent - key, velocity and time stamp of the event       *  @param itControlChangeEvent - controller, value and time stamp of the event
37       */       */
38      void Engine::ProcessNoteOn(EngineChannel* pEngineChannel, Pool<Event>::Iterator& itNoteOnEvent) {      void Engine::ProcessControlChange (
39          #if !CONFIG_PROCESS_MUTED_CHANNELS          LinuxSampler::EngineChannel*  pEngineChannel,
40          if (pEngineChannel->GetMute()) return; // skip if sampler channel is muted          Pool<Event>::Iterator&        itControlChangeEvent
41          #endif      ) {
42            dmsg(4,("Engine::ContinuousController cc=%d v=%d\n", itControlChangeEvent->Param.CC.Controller, itControlChangeEvent->Param.CC.Value));
         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) {  
                 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);  
43    
44          if (!pEngineChannel->SoloMode || pEngineChannel->PortamentoPos < 0.0f) pEngineChannel->PortamentoPos = (float) key;          EngineChannel* pChannel = dynamic_cast<EngineChannel*>(pEngineChannel);
45          pKey->RoundRobinIndex++;          // handle the "control triggered" MIDI rule: a control change
46      }          // event can trigger a new note on or note off event
47            if (pChannel->pInstrument) {
48    
49                ::gig::MidiRule* rule;
50                for (int i = 0 ; (rule = pChannel->pInstrument->GetMidiRule(i)) ; i++) {
51    
52                    if (::gig::MidiRuleCtrlTrigger* ctrlTrigger =
53                        dynamic_cast< ::gig::MidiRuleCtrlTrigger*>(rule)) {
54                        if (itControlChangeEvent->Param.CC.Controller ==
55                            ctrlTrigger->ControllerNumber) {
56    
57                            uint8_t oldCCValue = pChannel->ControllerTable[
58                                itControlChangeEvent->Param.CC.Controller];
59                            uint8_t newCCValue = itControlChangeEvent->Param.CC.Value;
60    
61                            for (int i = 0 ; i < ctrlTrigger->Triggers ; i++) {
62                                ::gig::MidiRuleCtrlTrigger::trigger_t* pTrigger =
63                                      &ctrlTrigger->pTriggers[i];
64    
65                                // check if the controller has passed the
66                                // trigger point in the right direction
67                                if ((pTrigger->Descending &&
68                                     oldCCValue > pTrigger->TriggerPoint &&
69                                     newCCValue <= pTrigger->TriggerPoint) ||
70                                    (!pTrigger->Descending &&
71                                     oldCCValue < pTrigger->TriggerPoint &&
72                                     newCCValue >= pTrigger->TriggerPoint)) {
73    
74                                    RTList<Event>::Iterator itNewEvent = pGlobalEvents->allocAppend();
75                                    if (itNewEvent) {
76                                        *itNewEvent = *itControlChangeEvent;
77                                        itNewEvent->Param.Note.Key = pTrigger->Key;
78    
79                                        if (pTrigger->NoteOff || pTrigger->Velocity == 0) {
80                                            itNewEvent->Type = Event::type_note_off;
81                                            itNewEvent->Param.Note.Velocity = 100;
82    
83                                            ProcessNoteOff(pEngineChannel, itNewEvent);
84                                        } else {
85                                            itNewEvent->Type = Event::type_note_on;
86                                            //TODO: if Velocity is 255, the triggered velocity should
87                                            // depend on how fast the controller is moving
88                                            itNewEvent->Param.Note.Velocity =
89                                                pTrigger->Velocity == 255 ? 100 :
90                                                pTrigger->Velocity;
91    
92      /**                                          ProcessNoteOn(pEngineChannel, itNewEvent);
93       *  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);  
94                                  }                                  }
95                                    else dmsg(1,("Event pool emtpy!\n"));
96                              }                              }
97                              // 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  
98                      }                      }
99                  }                  }
100              }              }
             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;  
101          }          }
102    
103          // if no solo mode (the usual case) or if solo mode and no other key pressed, then release voices on this key if needed          // update controller value in the engine channel's controller table
104          if (bShouldRelease) {          pChannel->ControllerTable[itControlChangeEvent->Param.CC.Controller] = itControlChangeEvent->Param.CC.Value;
105              itNoteOffEventOnKeyList->Type = Event::type_release; // transform event type  
106            ProcessHardcodedControllers(pEngineChannel, itControlChangeEvent);
             // 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;  
             }  
         }  
107    
108          // if neither a voice was spawned or postponed on this key then remove note off event from key again          // handle FX send controllers
109          if (!pKey->Active && !pKey->VoiceTheftsQueued)          ProcessFxSendControllers(pChannel, itControlChangeEvent);
             pKey->pEvents->free(itNoteOffEventOnKeyList);  
110      }      }
111    
112      /**      void Engine::ProcessChannelPressure(LinuxSampler::EngineChannel* pEngineChannel, Pool<Event>::Iterator& itChannelPressureEvent) {
113       *  Moves pitchbend event from the general (input) event list to the engine          // if required: engine global aftertouch handling (apart from the per voice handling)
      *  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  
114      }      }
115    
116      /**      void Engine::ProcessPolyphonicKeyPressure(LinuxSampler::EngineChannel* pEngineChannel, Pool<Event>::Iterator& itNotePressureEvent) {
117       *  Allocates and triggers a new voice. This method will usually be          // if required: engine global aftertouch handling (apart from the per voice handling)
118       *  called by the ProcessNoteOn() method and by the voices itself      }
119       *  (e.g. to spawn further voices on the same key for layered sounds).  
120       *      DiskThread* Engine::CreateDiskThread() {
121       *  @param pEngineChannel      - engine channel on which this event occured on          return new DiskThread (
122       *  @param itNoteOnEvent       - key, velocity and time stamp of the event              iMaxDiskStreams,
123       *  @param iLayer              - layer index for the new voice (optional - only              ((pAudioOutputDevice->MaxSamplesPerCycle() << CONFIG_MAX_PITCH) << 1) + 6, //FIXME: assuming stereo
124       *                               in case of layered sounds of course)              &instruments
125       *  @param ReleaseTriggerVoice - if new voice is a release triggered voice          );
126       *                               (optional, default = false)      }
127       *  @param VoiceStealing       - if voice stealing should be performed  
128       *                               when there is no free voice      void Engine::TriggerNewVoices (
129       *                               (optional, default = true)          LinuxSampler::EngineChannel* pEngineChannel,
130       *  @param HandleKeyGroupConflicts - if voices should be killed due to a          RTList<Event>::Iterator&     itNoteOnEvent,
131       *                                   key group conflict          bool                         HandleKeyGroupConflicts
132       *  @returns pointer to new voice or NULL if there was no free voice or      ) {
133       *           if the voice wasn't triggered (for example when no region is          EngineChannel* pChannel = static_cast<EngineChannel*>(pEngineChannel);
134       *           defined for the given key).          // first, get total amount of required voices (dependant on amount of layers)
135       */          ::gig::Region* pRegion = pChannel->pInstrument->GetRegion(itNoteOnEvent->Param.Note.Key);
136      Pool<Voice>::Iterator Engine::LaunchVoice(EngineChannel* pEngineChannel, Pool<Event>::Iterator& itNoteOnEvent, int iLayer, bool ReleaseTriggerVoice, bool VoiceStealing, bool HandleKeyGroupConflicts) {          if (pRegion && !RegionSuspended(pRegion)) {
137          int MIDIKey            = itNoteOnEvent->Param.Note.Key;              int voicesRequired = pRegion->Layers;
138          midi_key_info_t* pKey  = &pEngineChannel->pMIDIKeyInfo[MIDIKey];              // now launch the required amount of voices
139          ::gig::Region* pRegion = pEngineChannel->pInstrument->GetRegion(MIDIKey);              for (int i = 0; i < voicesRequired; i++)
140                    LaunchVoice(pChannel, itNoteOnEvent, i, false, true, HandleKeyGroupConflicts);
141            }
142        }
143    
144        void Engine::TriggerReleaseVoices (
145            LinuxSampler::EngineChannel*  pEngineChannel,
146            RTList<Event>::Iterator&      itNoteOffEvent
147        ) {
148            EngineChannel* pChannel = static_cast<EngineChannel*>(pEngineChannel);
149            MidiKey* pKey = &pChannel->pMIDIKeyInfo[itNoteOffEvent->Param.Note.Key];
150            // first, get total amount of required voices (dependant on amount of layers)
151            ::gig::Region* pRegion = pChannel->pInstrument->GetRegion(itNoteOffEvent->Param.Note.Key);
152            if (pRegion) {
153                int voicesRequired = pRegion->Layers;
154    
155                // MIDI note-on velocity is used instead of note-off velocity
156                itNoteOffEvent->Param.Note.Velocity = pKey->Velocity;
157    
158                // now launch the required amount of voices
159                for (int i = 0; i < voicesRequired; i++)
160                    LaunchVoice(pChannel, itNoteOffEvent, i, true, false, false); //FIXME: for the moment we don't perform voice stealing for release triggered samples
161            }
162        }
163    
164        Pool<Voice>::Iterator Engine::LaunchVoice (
165            LinuxSampler::EngineChannel*  pEngineChannel,
166            Pool<Event>::Iterator&        itNoteOnEvent,
167            int                           iLayer,
168            bool                          ReleaseTriggerVoice,
169            bool                          VoiceStealing,
170            bool                          HandleKeyGroupConflicts
171        ) {
172            EngineChannel* pChannel = static_cast<EngineChannel*>(pEngineChannel);
173            int MIDIKey = itNoteOnEvent->Param.Note.Key;
174            EngineChannel::MidiKey* pKey  = &pChannel->pMIDIKeyInfo[MIDIKey];
175            ::gig::Region* pRegion = pChannel->pInstrument->GetRegion(MIDIKey);
176    
177          // if nothing defined for this key          // if nothing defined for this key
178          if (!pRegion) return Pool<Voice>::Iterator(); // nothing to do          if (!pRegion) return Pool<Voice>::Iterator(); // nothing to do
179    
180          // only mark the first voice of a layered voice (group) to be in a          int iKeyGroup = pRegion->KeyGroup;
181          // key group, so the layered voices won't kill each other          // only need to send a group event from the first voice in a layered region,
182          int iKeyGroup = (iLayer == 0 && !ReleaseTriggerVoice) ? pRegion->KeyGroup : 0;          // as all layers in a region always belongs to the same key group
183            if (HandleKeyGroupConflicts && iLayer == 0) pChannel->HandleKeyGroupConflicts(iKeyGroup, itNoteOnEvent);
         // handle key group (a.k.a. exclusive group) conflicts  
         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  
                         }  
                     }  
                 }  
             }  
         }  
184    
185          Voice::type_t VoiceType = Voice::type_normal;          Voice::type_t VoiceType = Voice::type_normal;
186    
# Line 978  namespace LinuxSampler { namespace gig { Line 200  namespace LinuxSampler { namespace gig {
200                      DimValues[i] = itNoteOnEvent->Param.Note.Velocity;                      DimValues[i] = itNoteOnEvent->Param.Note.Velocity;
201                      break;                      break;
202                  case ::gig::dimension_channelaftertouch:                  case ::gig::dimension_channelaftertouch:
203                      DimValues[i] = pEngineChannel->ControllerTable[128];                      DimValues[i] = pChannel->ControllerTable[128];
204                      break;                      break;
205                  case ::gig::dimension_releasetrigger:                  case ::gig::dimension_releasetrigger:
206                      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;
207                      DimValues[i] = (uint) ReleaseTriggerVoice;                      DimValues[i] = (uint) ReleaseTriggerVoice;
208                      break;                      break;
209                  case ::gig::dimension_keyboard:                  case ::gig::dimension_keyboard:
210                      DimValues[i] = (uint) (pEngineChannel->CurrentKeyDimension * pRegion->pDimensionDefinitions[i].zones);                      DimValues[i] = (uint) (pChannel->CurrentKeyDimension * pRegion->pDimensionDefinitions[i].zones);
211                      break;                      break;
212                  case ::gig::dimension_roundrobin:                  case ::gig::dimension_roundrobin:
213                      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
214                        break;
215                    case ::gig::dimension_roundrobinkeyboard:
216                        DimValues[i] = uint(pChannel->RoundRobinIndex % pRegion->pDimensionDefinitions[i].zones); // RoundRobinIndex is incremented for each note on
217                      break;                      break;
218                  case ::gig::dimension_random:                  case ::gig::dimension_random:
219                      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  
220                      break;                      break;
221                  case ::gig::dimension_modwheel:                  case ::gig::dimension_modwheel:
222                      DimValues[i] = pEngineChannel->ControllerTable[1];                      DimValues[i] = pChannel->ControllerTable[1];
223                      break;                      break;
224                  case ::gig::dimension_breath:                  case ::gig::dimension_breath:
225                      DimValues[i] = pEngineChannel->ControllerTable[2];                      DimValues[i] = pChannel->ControllerTable[2];
226                      break;                      break;
227                  case ::gig::dimension_foot:                  case ::gig::dimension_foot:
228                      DimValues[i] = pEngineChannel->ControllerTable[4];                      DimValues[i] = pChannel->ControllerTable[4];
229                      break;                      break;
230                  case ::gig::dimension_portamentotime:                  case ::gig::dimension_portamentotime:
231                      DimValues[i] = pEngineChannel->ControllerTable[5];                      DimValues[i] = pChannel->ControllerTable[5];
232                      break;                      break;
233                  case ::gig::dimension_effect1:                  case ::gig::dimension_effect1:
234                      DimValues[i] = pEngineChannel->ControllerTable[12];                      DimValues[i] = pChannel->ControllerTable[12];
235                      break;                      break;
236                  case ::gig::dimension_effect2:                  case ::gig::dimension_effect2:
237                      DimValues[i] = pEngineChannel->ControllerTable[13];                      DimValues[i] = pChannel->ControllerTable[13];
238                      break;                      break;
239                  case ::gig::dimension_genpurpose1:                  case ::gig::dimension_genpurpose1:
240                      DimValues[i] = pEngineChannel->ControllerTable[16];                      DimValues[i] = pChannel->ControllerTable[16];
241                      break;                      break;
242                  case ::gig::dimension_genpurpose2:                  case ::gig::dimension_genpurpose2:
243                      DimValues[i] = pEngineChannel->ControllerTable[17];                      DimValues[i] = pChannel->ControllerTable[17];
244                      break;                      break;
245                  case ::gig::dimension_genpurpose3:                  case ::gig::dimension_genpurpose3:
246                      DimValues[i] = pEngineChannel->ControllerTable[18];                      DimValues[i] = pChannel->ControllerTable[18];
247                      break;                      break;
248                  case ::gig::dimension_genpurpose4:                  case ::gig::dimension_genpurpose4:
249                      DimValues[i] = pEngineChannel->ControllerTable[19];                      DimValues[i] = pChannel->ControllerTable[19];
250                      break;                      break;
251                  case ::gig::dimension_sustainpedal:                  case ::gig::dimension_sustainpedal:
252                      DimValues[i] = pEngineChannel->ControllerTable[64];                      DimValues[i] = pChannel->ControllerTable[64];
253                      break;                      break;
254                  case ::gig::dimension_portamento:                  case ::gig::dimension_portamento:
255                      DimValues[i] = pEngineChannel->ControllerTable[65];                      DimValues[i] = pChannel->ControllerTable[65];
256                      break;                      break;
257                  case ::gig::dimension_sostenutopedal:                  case ::gig::dimension_sostenutopedal:
258                      DimValues[i] = pEngineChannel->ControllerTable[66];                      DimValues[i] = pChannel->ControllerTable[66];
259                      break;                      break;
260                  case ::gig::dimension_softpedal:                  case ::gig::dimension_softpedal:
261                      DimValues[i] = pEngineChannel->ControllerTable[67];                      DimValues[i] = pChannel->ControllerTable[67];
262                      break;                      break;
263                  case ::gig::dimension_genpurpose5:                  case ::gig::dimension_genpurpose5:
264                      DimValues[i] = pEngineChannel->ControllerTable[80];                      DimValues[i] = pChannel->ControllerTable[80];
265                      break;                      break;
266                  case ::gig::dimension_genpurpose6:                  case ::gig::dimension_genpurpose6:
267                      DimValues[i] = pEngineChannel->ControllerTable[81];                      DimValues[i] = pChannel->ControllerTable[81];
268                      break;                      break;
269                  case ::gig::dimension_genpurpose7:                  case ::gig::dimension_genpurpose7:
270                      DimValues[i] = pEngineChannel->ControllerTable[82];                      DimValues[i] = pChannel->ControllerTable[82];
271                      break;                      break;
272                  case ::gig::dimension_genpurpose8:                  case ::gig::dimension_genpurpose8:
273                      DimValues[i] = pEngineChannel->ControllerTable[83];                      DimValues[i] = pChannel->ControllerTable[83];
274                      break;                      break;
275                  case ::gig::dimension_effect1depth:                  case ::gig::dimension_effect1depth:
276                      DimValues[i] = pEngineChannel->ControllerTable[91];                      DimValues[i] = pChannel->ControllerTable[91];
277                      break;                      break;
278                  case ::gig::dimension_effect2depth:                  case ::gig::dimension_effect2depth:
279                      DimValues[i] = pEngineChannel->ControllerTable[92];                      DimValues[i] = pChannel->ControllerTable[92];
280                      break;                      break;
281                  case ::gig::dimension_effect3depth:                  case ::gig::dimension_effect3depth:
282                      DimValues[i] = pEngineChannel->ControllerTable[93];                      DimValues[i] = pChannel->ControllerTable[93];
283                      break;                      break;
284                  case ::gig::dimension_effect4depth:                  case ::gig::dimension_effect4depth:
285                      DimValues[i] = pEngineChannel->ControllerTable[94];                      DimValues[i] = pChannel->ControllerTable[94];
286                      break;                      break;
287                  case ::gig::dimension_effect5depth:                  case ::gig::dimension_effect5depth:
288                      DimValues[i] = pEngineChannel->ControllerTable[95];                      DimValues[i] = pChannel->ControllerTable[95];
289                      break;                      break;
290                  case ::gig::dimension_none:                  case ::gig::dimension_none:
291                      std::cerr << "gig::Engine::LaunchVoice() Error: dimension=none\n" << std::flush;                      std::cerr << "gig::Engine::LaunchVoice() Error: dimension=none\n" << std::flush;
# Line 1074  namespace LinuxSampler { namespace gig { Line 298  namespace LinuxSampler { namespace gig {
298          // return if this is a release triggered voice and there is no          // return if this is a release triggered voice and there is no
299          // releasetrigger dimension (could happen if an instrument          // releasetrigger dimension (could happen if an instrument
300          // change has occured between note on and off)          // change has occured between note on and off)
301          if (ReleaseTriggerVoice && VoiceType != Voice::type_release_trigger) return Pool<Voice>::Iterator();          if (ReleaseTriggerVoice && !(VoiceType & Voice::type_release_trigger)) return Pool<Voice>::Iterator();
302    
303          ::gig::DimensionRegion* pDimRgn = pRegion->GetDimensionRegionByValue(DimValues);          ::gig::DimensionRegion* pDimRgn = pRegion->GetDimensionRegionByValue(DimValues);
304            if (!pDimRgn) return Pool<Voice>::Iterator(); // error (could not resolve dimension region)
305    
306          // no need to continue if sample is silent          // no need to continue if sample is silent
307          if (!pDimRgn->pSample || !pDimRgn->pSample->SamplesTotal) return Pool<Voice>::Iterator();          if (!pDimRgn->pSample || !pDimRgn->pSample->SamplesTotal) return Pool<Voice>::Iterator();
308    
309          // allocate a new voice for the key          // allocate a new voice for the key
310          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  
                 }  
             }  
311    
312              // jump point if a 'stealable' voice was found          int res = InitNewVoice (
313              stealable_voice_found:                  pChannel, pDimRgn, itNoteOnEvent, VoiceType, iLayer,
314                    iKeyGroup, ReleaseTriggerVoice, VoiceStealing, itNewVoice
315            );
316            if (!res) return itNewVoice;
317    
318              #if CONFIG_DEVMODE          return Pool<Voice>::Iterator(); // no free voice or error
             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));  
   
         // 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);  
                 }  
                 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  
                 KillAllVoices(pEngineChannel, itControlChangeEvent);  
                 pEngineChannel->PortamentoMode = itControlChangeEvent->Param.CC.Value >= 64;  
                 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  
                 KillAllVoices(pEngineChannel, itControlChangeEvent);  
                 pEngineChannel->SoloMode = true;  
                 break;  
             }  
             case 127: { // poly mode on  
                 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);  
             }  
         }  
     }  
   
     /**  
      *  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;  
             }  
         }  
   
         free_sysex_data: // finally free sysex data  
         pSysexBuffer->increment_read_ptr(itSysexEvent->Param.Sysex.Size);  
     }  
   
     /**  
      * 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;  
319      }      }
320    
321      bool Engine::DiskStreamSupported() {      bool Engine::DiskStreamSupported() {
322          return true;          return true;
323      }      }
324    
     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;  
     }  
   
325      String Engine::Description() {      String Engine::Description() {
326          return "Gigasampler Engine";          return "GigaSampler Format Engine";
327      }      }
328    
329      String Engine::Version() {      String Engine::Version() {
330          String s = "$Revision: 1.74 $";          String s = "$Revision$";
331          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
332      }      }
333    
     InstrumentManager* Engine::GetInstrumentManager() {  
         return &instruments;  
     }  
   
     // static constant initializers  
     const float* Engine::VolumeCurve(InitVolumeCurve());  
     const float* Engine::PanCurve(InitPanCurve());  
     const float* 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;  
     }  
   
     /**  
      * Changes the instrument for an engine channel.  
      *  
      * @param pEngineChannel - engine channel on which the instrument  
      *                         should be changed  
      * @param pInstrument - new instrument  
      * @returns a list of dimension regions from the old instrument  
      *          that are still in use  
      */  
     ::gig::DimensionRegion** Engine::ChangeInstrument(EngineChannel* pEngineChannel, ::gig::Instrument* pInstrument) {  
         instrument_change_command_t command;  
         command.pEngineChannel = pEngineChannel;  
         command.pInstrument = pInstrument;  
         InstrumentChangeQueue->push(&command);  
   
         // wait for the audio thread to confirm that the instrument  
         // change has been done  
         instrument_change_reply_t reply;  
         while (InstrumentChangeReplyQueue->pop(&reply) == 0) {  
             usleep(10000);  
         }  
         return pDimRegionsInUse;  
     }  
   
334  }} // namespace LinuxSampler::gig  }} // namespace LinuxSampler::gig
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