src/engines/EngineChannelBase.h

/***************************************************************************
 *                                                                         *
 *   LinuxSampler - modular, streaming capable sampler                     *
 *                                                                         *
 *   Copyright (C) 2003,2004 by Benno Senoner and Christian Schoenebeck    *
 *   Copyright (C) 2005-2008 Christian Schoenebeck                         *
 *   Copyright (C) 2009-2010 Christian Schoenebeck and Grigor Iliev        *
 *                                                                         *
 *   This program is free software; you can redistribute it and/or modify  *
 *   it under the terms of the GNU General Public License as published by  *
 *   the Free Software Foundation; either version 2 of the License, or     *
 *   (at your option) any later version.                                   *
 *                                                                         *
 *   This program is distributed in the hope that it will be useful,       *
 *   but WITHOUT ANY WARRANTY; without even the implied warranty of        *
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the         *
 *   GNU General Public License for more details.                          *
 *                                                                         *
 *   You should have received a copy of the GNU General Public License     *
 *   along with this program; if not, write to the Free Software           *
 *   Foundation, Inc., 59 Temple Place, Suite 330, Boston,                 *
 *   MA  02111-1307  USA                                                   *
 ***************************************************************************/

#ifndef __LS_ENGINECHANNELBASE_H__
#define __LS_ENGINECHANNELBASE_H__

#include "AbstractEngineChannel.h"
#include "common/MidiKeyboardManager.h"
#include "common/Voice.h"
#include "../common/ResourceManager.h"

namespace LinuxSampler {
    /// Command used by the instrument loader thread to
    /// request an instrument change on a channel.
    template <class R /* Region */, class I /* Instrument */>
    class InstrumentChangeCmd {
        public:
            bool bChangeInstrument;       ///< Set to true by the loader when the channel should change instrument.
            I* pInstrument;               ///< The new instrument. Also used by the loader to read the previously loaded instrument.
            RTList<R*>* pRegionsInUse; ///< List of dimension regions in use by the currently loaded instrument. Continuously updated by the audio thread.
    };

    template<class R>
    class RegionPools {
        public:
            virtual Pool<R*>* GetRegionPool(int index) = 0;
    };

    template<class V>
    class VoicePool {
        public:
            virtual Pool<V>* GetVoicePool() = 0;
    };

    template <class V /* Voice */, class R /* Region */, class I /* Instrument */>
    class EngineChannelBase: public AbstractEngineChannel, public MidiKeyboardManager<V>, public ResourceConsumer<I> {
        public:
            typedef typename RTList<R*>::Iterator RTListRegionIterator;
            typedef typename MidiKeyboardManager<V>::MidiKey MidiKey;

            virtual void HandBack(I* Instrument) {
                ResourceManager<InstrumentManager::instrument_id_t, I>* mgr =
                    dynamic_cast<ResourceManager<InstrumentManager::instrument_id_t, I>*>(pEngine->GetInstrumentManager());
                mgr->HandBack(Instrument, this);
            }

            virtual void ClearRegionsInUse() {
                {
                    InstrumentChangeCmd<R, I>& cmd = InstrumentChangeCommand.GetConfigForUpdate();
                    if(cmd.pRegionsInUse != NULL) cmd.pRegionsInUse->clear();
                }
                {
                    InstrumentChangeCmd<R, I>& cmd = InstrumentChangeCommand.SwitchConfig();
                    if(cmd.pRegionsInUse != NULL) cmd.pRegionsInUse->clear();
                }
            }

            virtual void ResetRegionsInUse(Pool<R*>* pRegionPool[]) {
                DeleteRegionsInUse();
                AllocateRegionsInUse(pRegionPool);
            }

            virtual void DeleteRegionsInUse() {
                {
                    InstrumentChangeCmd<R, I>& cmd = InstrumentChangeCommand.GetConfigForUpdate();
                    if(cmd.pRegionsInUse != NULL) {
                        delete cmd.pRegionsInUse;
                        cmd.pRegionsInUse = NULL;
                    }
                }
                {
                    InstrumentChangeCmd<R, I>& cmd = InstrumentChangeCommand.SwitchConfig();
                    if(cmd.pRegionsInUse != NULL) {
                        delete cmd.pRegionsInUse;
                        cmd.pRegionsInUse = NULL;
                    }
                }
            }

            virtual void AllocateRegionsInUse(Pool<R*>* pRegionPool[]) {
                {
                    InstrumentChangeCmd<R, I>& cmd = InstrumentChangeCommand.GetConfigForUpdate();
                    cmd.pRegionsInUse = new RTList<R*>(pRegionPool[0]);
                }
                {
                    InstrumentChangeCmd<R, I>& cmd = InstrumentChangeCommand.SwitchConfig();
                    cmd.pRegionsInUse = new RTList<R*>(pRegionPool[1]);
                }
            }

            virtual void Connect(AudioOutputDevice* pAudioOut) {
                if (pEngine) {
                    if (pEngine->pAudioOutputDevice == pAudioOut) return;
                    DisconnectAudioOutputDevice();
                }
                pEngine = AbstractEngine::AcquireEngine(this, pAudioOut);
                ResetInternal();
                pEvents = new RTList<Event>(pEngine->pEventPool);

                RegionPools<R>* pRegionPool = dynamic_cast<RegionPools<R>*>(pEngine);
                // reset the instrument change command struct (need to be done
                // twice, as it is double buffered)
                {
                    InstrumentChangeCmd<R, I>& cmd = InstrumentChangeCommand.GetConfigForUpdate();
                    cmd.pRegionsInUse = new RTList<R*>(pRegionPool->GetRegionPool(0));
                    cmd.pInstrument = 0;
                    cmd.bChangeInstrument = false;
                }
                {
                    InstrumentChangeCmd<R, I>& cmd = InstrumentChangeCommand.SwitchConfig();
                    cmd.pRegionsInUse = new RTList<R*>(pRegionPool->GetRegionPool(1));
                    cmd.pInstrument = 0;
                    cmd.bChangeInstrument = false;
                }

                if (pInstrument != NULL) {
                    pInstrument = NULL;
                    InstrumentStat = -1;
                    InstrumentIdx  = -1;
                    InstrumentIdxName = "";
                    InstrumentFile = "";
                    bStatusChanged = true;
                }

                VoicePool<V>* pVoicePool = dynamic_cast<VoicePool<V>*>(pEngine);
                MidiKeyboardManager<V>::AllocateActiveVoices(pVoicePool->GetVoicePool());
                MidiKeyboardManager<V>::AllocateEvents(pEngine->pEventPool);

                AudioDeviceChannelLeft  = 0;
                AudioDeviceChannelRight = 1;
                if (fxSends.empty()) { // render directly into the AudioDevice's output buffers
                    pChannelLeft  = pAudioOut->Channel(AudioDeviceChannelLeft);
                    pChannelRight = pAudioOut->Channel(AudioDeviceChannelRight);
                } else { // use local buffers for rendering and copy later
                    // ensure the local buffers have the correct size
                    if (pChannelLeft)  delete pChannelLeft;
                    if (pChannelRight) delete pChannelRight;
                    pChannelLeft  = new AudioChannel(0, pAudioOut->MaxSamplesPerCycle());
                    pChannelRight = new AudioChannel(1, pAudioOut->MaxSamplesPerCycle());
                }
                if (pEngine->EngineDisabled.GetUnsafe()) pEngine->Enable();
                MidiInputPort::AddSysexListener(pEngine);
            }

            virtual void DisconnectAudioOutputDevice() {
                if (pEngine) { // if clause to prevent disconnect loops

                    ResetInternal();

                    DeleteRegionsInUse();

                    InstrumentChangeCmd<R, I>& cmd = InstrumentChangeCommand.GetConfigForUpdate();
                    if (cmd.pInstrument) {
                        // release the currently loaded instrument
                        HandBack(cmd.pInstrument);
                    }

                    if (pEvents) {
                        delete pEvents;
                        pEvents = NULL;
                    }

                    MidiKeyboardManager<V>::DeleteActiveVoices();
                    MidiKeyboardManager<V>::DeleteEvents();
                    DeleteGroupEventLists();

                    AudioOutputDevice* oldAudioDevice = pEngine->pAudioOutputDevice;
                    pEngine = NULL;
                    AbstractEngine::FreeEngine(this, oldAudioDevice);
                    AudioDeviceChannelLeft  = -1;
                    AudioDeviceChannelRight = -1;
                    if (!fxSends.empty()) { // free the local rendering buffers
                        if (pChannelLeft)  delete pChannelLeft;
                        if (pChannelRight) delete pChannelRight;
                    }
                    pChannelLeft  = NULL;
                    pChannelRight = NULL;
                }
            }

            class ClearEventListsHandler : public MidiKeyboardManager<V>::VoiceHandlerBase {
                public:
                    virtual bool Process(MidiKey* pMidiKey) { pMidiKey->pEvents->clear(); return false; }
            };

            void ClearEventLists() {
                pEvents->clear();
                // empty MIDI key specific event lists
                ClearEventListsHandler handler;
                ProcessActiveVoices(&handler);

                // empty exclusive group specific event lists
                ClearGroupEventLists();
            }

            // implementation of abstract methods derived from interface class 'InstrumentConsumer'

            /**
             * Will be called by the InstrumentResourceManager when the instrument
             * we are currently using on this EngineChannel is going to be updated,
             * so we can stop playback before that happens.
             */
            virtual void ResourceToBeUpdated(I* pResource, void*& pUpdateArg) {
                dmsg(3,("EngineChannelBase: Received instrument update message.\n"));
                if (pEngine) pEngine->DisableAndLock();
                ResetInternal();
                this->pInstrument = NULL;
            }

            /**
             * Will be called by the InstrumentResourceManager when the instrument
             * update process was completed, so we can continue with playback.
             */
            virtual void ResourceUpdated(I* pOldResource, I* pNewResource, void* pUpdateArg) {
                this->pInstrument = pNewResource; //TODO: there are couple of engine parameters we should update here as well if the instrument was updated (see LoadInstrument())
                if (pEngine) pEngine->Enable();
                bStatusChanged = true; // status of engine has changed, so set notify flag
            }

            /**
             * Will be called by the InstrumentResourceManager on progress changes
             * while loading or realoading an instrument for this EngineChannel.
             *
             * @param fProgress - current progress as value between 0.0 and 1.0
             */
            virtual void OnResourceProgress(float fProgress) {
                this->InstrumentStat = int(fProgress * 100.0f);
                dmsg(7,("EngineChannelBase: progress %d%", InstrumentStat));
                bStatusChanged = true; // status of engine has changed, so set notify flag
            }

            void RenderActiveVoices(uint Samples) {
                RenderVoicesHandler handler(this, Samples);
                ProcessActiveVoices(&handler);

                SetVoiceCount(handler.VoiceCount);
                SetDiskStreamCount(handler.StreamCount);
            }

            RTList<R*>* pRegionsInUse;     ///< temporary pointer into the instrument change command, used by the audio thread
            I* pInstrument;

            template<class TV, class TRR, class TR, class TD, class TIM, class TI> friend class EngineBase;

        protected:
            EngineChannelBase() : InstrumentChangeCommandReader(InstrumentChangeCommand) {
                pInstrument = NULL;

                // reset the instrument change command struct (need to be done
                // twice, as it is double buffered)
                {
                    InstrumentChangeCmd<R, I>& cmd = InstrumentChangeCommand.GetConfigForUpdate();
                    cmd.pRegionsInUse = NULL;
                    cmd.pInstrument = NULL;
                    cmd.bChangeInstrument = false;
                }
                {
                    InstrumentChangeCmd<R, I>& cmd = InstrumentChangeCommand.SwitchConfig();
                    cmd.pRegionsInUse = NULL;
                    cmd.pInstrument = NULL;
                    cmd.bChangeInstrument = false;
                }
            }

            virtual ~EngineChannelBase() { }

            typedef typename RTList<V>::Iterator RTListVoiceIterator;

            class RenderVoicesHandler : public MidiKeyboardManager<V>::VoiceHandlerBase {
                public:
                    uint Samples;
                    uint VoiceCount;
                    uint StreamCount;
                    EngineChannelBase<V, R, I>* pChannel;

                    RenderVoicesHandler(EngineChannelBase<V, R, I>* channel, uint samples) :
                        pChannel(channel), Samples(samples), VoiceCount(0), StreamCount(0) { }

                    virtual void Process(RTListVoiceIterator& itVoice) {
                        // now render current voice
                        itVoice->Render(Samples);
                        if (itVoice->IsActive()) { // still active
                            if (!itVoice->Orphan) {
                                *(pChannel->pRegionsInUse->allocAppend()) = itVoice->GetRegion();
                            }
                            VoiceCount++;

                            if (itVoice->PlaybackState == Voice::playback_state_disk) {
                                if ((itVoice->DiskStreamRef).State != Stream::state_unused) StreamCount++;
                            }
                        }  else { // voice reached end, is now inactive
                            pChannel->FreeVoice(itVoice); // remove voice from the list of active voices
                        }
                    }
            };

            typedef typename SynchronizedConfig<InstrumentChangeCmd<R, I> >::Reader SyncConfInstrChangeCmdReader;

            SynchronizedConfig<InstrumentChangeCmd<R, I> > InstrumentChangeCommand;
            SyncConfInstrChangeCmdReader InstrumentChangeCommandReader;

            /** This method is not thread safe! */
            virtual void ResetInternal() {
                AbstractEngineChannel::ResetInternal();

                MidiKeyboardManager<V>::Reset();
            }

            virtual void ResetControllers() {
                AbstractEngineChannel::ResetControllers();

                MidiKeyboardManager<V>::SustainPedal   = false;
                MidiKeyboardManager<V>::SostenutoPedal = false;
            }

            /**
             * Changes the instrument for an engine channel.
             *
             * @param pInstrument - new instrument
             * @returns the resulting instrument change command after the
             *          command switch, containing the old instrument and
             *          the dimregions it is using
             */
            InstrumentChangeCmd<R, I>& ChangeInstrument(I* pInstrument) {
                InstrumentChangeCmd<R, I>& cmd = InstrumentChangeCommand.GetConfigForUpdate();
                cmd.pInstrument = pInstrument;
                cmd.bChangeInstrument = true;

                return InstrumentChangeCommand.SwitchConfig();
            }

            virtual void ProcessKeySwitchChange(int key) = 0;
    };

} // namespace LinuxSampler

#endif  /* __LS_ENGINECHANNELBASE_H__ */
1	iliev	2012	/***************************************************************************
2			* *
3			* LinuxSampler - modular, streaming capable sampler *
4			* *
5			* Copyright (C) 2003,2004 by Benno Senoner and Christian Schoenebeck *
6	persson	2072	* Copyright (C) 2005-2008 Christian Schoenebeck *
7			* Copyright (C) 2009-2010 Christian Schoenebeck and Grigor Iliev *
8	iliev	2012	* *
9			* 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 *
11			* the Free Software Foundation; either version 2 of the License, or *
12			* (at your option) any later version. *
13			* *
14			* This program is distributed in the hope that it will be useful, *
15			* but WITHOUT ANY WARRANTY; without even the implied warranty of *
16			* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
17			* GNU General Public License for more details. *
18			* *
19			* You should have received a copy of the GNU General Public License *
20			* along with this program; if not, write to the Free Software *
21			* Foundation, Inc., 59 Temple Place, Suite 330, Boston, *
22			* MA 02111-1307 USA *
23			***************************************************************************/
24
25			#ifndef __LS_ENGINECHANNELBASE_H__
26			#define __LS_ENGINECHANNELBASE_H__
27
28			#include "AbstractEngineChannel.h"
29			#include "common/MidiKeyboardManager.h"
30			#include "common/Voice.h"
31			#include "../common/ResourceManager.h"
32
33			namespace LinuxSampler {
34			/// Command used by the instrument loader thread to
35			/// request an instrument change on a channel.
36			template <class R /* Region /, class I / Instrument */>
37			class InstrumentChangeCmd {
38			public:
39			bool bChangeInstrument; ///< Set to true by the loader when the channel should change instrument.
40			I* pInstrument; ///< The new instrument. Also used by the loader to read the previously loaded instrument.
41			RTList<R> pRegionsInUse; ///< List of dimension regions in use by the currently loaded instrument. Continuously updated by the audio thread.
42			};
43
44			template<class R>
45			class RegionPools {
46			public:
47			virtual Pool<R> GetRegionPool(int index) = 0;
48			};
49
50			template<class V>
51			class VoicePool {
52			public:
53			virtual Pool<V>* GetVoicePool() = 0;
54			};
55
56			template <class V /* Voice /, class R / Region /, class I / Instrument */>
57			class EngineChannelBase: public AbstractEngineChannel, public MidiKeyboardManager<V>, public ResourceConsumer<I> {
58			public:
59			typedef typename RTList<R*>::Iterator RTListRegionIterator;
60			typedef typename MidiKeyboardManager<V>::MidiKey MidiKey;
61
62			virtual void HandBack(I* Instrument) {
63			ResourceManager<InstrumentManager::instrument_id_t, I>* mgr =
64			dynamic_cast<ResourceManager<InstrumentManager::instrument_id_t, I>*>(pEngine->GetInstrumentManager());
65			mgr->HandBack(Instrument, this);
66			}
67
68			virtual void ClearRegionsInUse() {
69			{
70			InstrumentChangeCmd<R, I>& cmd = InstrumentChangeCommand.GetConfigForUpdate();
71			if(cmd.pRegionsInUse != NULL) cmd.pRegionsInUse->clear();
72			}
73			{
74			InstrumentChangeCmd<R, I>& cmd = InstrumentChangeCommand.SwitchConfig();
75			if(cmd.pRegionsInUse != NULL) cmd.pRegionsInUse->clear();
76			}
77			}
78
79			virtual void ResetRegionsInUse(Pool<R> pRegionPool[]) {
80			DeleteRegionsInUse();
81			AllocateRegionsInUse(pRegionPool);
82			}
83
84			virtual void DeleteRegionsInUse() {
85			{
86			InstrumentChangeCmd<R, I>& cmd = InstrumentChangeCommand.GetConfigForUpdate();
87			if(cmd.pRegionsInUse != NULL) {
88			delete cmd.pRegionsInUse;
89			cmd.pRegionsInUse = NULL;
90			}
91			}
92			{
93			InstrumentChangeCmd<R, I>& cmd = InstrumentChangeCommand.SwitchConfig();
94			if(cmd.pRegionsInUse != NULL) {
95			delete cmd.pRegionsInUse;
96			cmd.pRegionsInUse = NULL;
97			}
98			}
99			}
100
101			virtual void AllocateRegionsInUse(Pool<R> pRegionPool[]) {
102			{
103			InstrumentChangeCmd<R, I>& cmd = InstrumentChangeCommand.GetConfigForUpdate();
104			cmd.pRegionsInUse = new RTList<R*>(pRegionPool[0]);
105			}
106			{
107			InstrumentChangeCmd<R, I>& cmd = InstrumentChangeCommand.SwitchConfig();
108			cmd.pRegionsInUse = new RTList<R*>(pRegionPool[1]);
109			}
110			}
111
112			virtual void Connect(AudioOutputDevice* pAudioOut) {
113			if (pEngine) {
114			if (pEngine->pAudioOutputDevice == pAudioOut) return;
115			DisconnectAudioOutputDevice();
116			}
117			pEngine = AbstractEngine::AcquireEngine(this, pAudioOut);
118			ResetInternal();
119			pEvents = new RTList<Event>(pEngine->pEventPool);
120
121			RegionPools<R>* pRegionPool = dynamic_cast<RegionPools<R>*>(pEngine);
122			// reset the instrument change command struct (need to be done
123			// twice, as it is double buffered)
124			{
125			InstrumentChangeCmd<R, I>& cmd = InstrumentChangeCommand.GetConfigForUpdate();
126			cmd.pRegionsInUse = new RTList<R*>(pRegionPool->GetRegionPool(0));
127			cmd.pInstrument = 0;
128			cmd.bChangeInstrument = false;
129			}
130			{
131			InstrumentChangeCmd<R, I>& cmd = InstrumentChangeCommand.SwitchConfig();
132			cmd.pRegionsInUse = new RTList<R*>(pRegionPool->GetRegionPool(1));
133			cmd.pInstrument = 0;
134			cmd.bChangeInstrument = false;
135			}
136
137			if (pInstrument != NULL) {
138			pInstrument = NULL;
139			InstrumentStat = -1;
140			InstrumentIdx = -1;
141			InstrumentIdxName = "";
142			InstrumentFile = "";
143			bStatusChanged = true;
144			}
145
146			VoicePool<V>* pVoicePool = dynamic_cast<VoicePool<V>*>(pEngine);
147			MidiKeyboardManager<V>::AllocateActiveVoices(pVoicePool->GetVoicePool());
148			MidiKeyboardManager<V>::AllocateEvents(pEngine->pEventPool);
149
150			AudioDeviceChannelLeft = 0;
151			AudioDeviceChannelRight = 1;
152			if (fxSends.empty()) { // render directly into the AudioDevice's output buffers
153			pChannelLeft = pAudioOut->Channel(AudioDeviceChannelLeft);
154			pChannelRight = pAudioOut->Channel(AudioDeviceChannelRight);
155			} else { // use local buffers for rendering and copy later
156			// ensure the local buffers have the correct size
157			if (pChannelLeft) delete pChannelLeft;
158			if (pChannelRight) delete pChannelRight;
159			pChannelLeft = new AudioChannel(0, pAudioOut->MaxSamplesPerCycle());
160			pChannelRight = new AudioChannel(1, pAudioOut->MaxSamplesPerCycle());
161			}
162			if (pEngine->EngineDisabled.GetUnsafe()) pEngine->Enable();
163			MidiInputPort::AddSysexListener(pEngine);
164			}
165
166			virtual void DisconnectAudioOutputDevice() {
167			if (pEngine) { // if clause to prevent disconnect loops
168
169			ResetInternal();
170
171			DeleteRegionsInUse();
172
173			InstrumentChangeCmd<R, I>& cmd = InstrumentChangeCommand.GetConfigForUpdate();
174			if (cmd.pInstrument) {
175			// release the currently loaded instrument
176			HandBack(cmd.pInstrument);
177			}
178
179			if (pEvents) {
180			delete pEvents;
181			pEvents = NULL;
182			}
183
184			MidiKeyboardManager<V>::DeleteActiveVoices();
185			MidiKeyboardManager<V>::DeleteEvents();
186	persson	2114	DeleteGroupEventLists();
187	iliev	2012
188			AudioOutputDevice* oldAudioDevice = pEngine->pAudioOutputDevice;
189			pEngine = NULL;
190			AbstractEngine::FreeEngine(this, oldAudioDevice);
191			AudioDeviceChannelLeft = -1;
192			AudioDeviceChannelRight = -1;
193			if (!fxSends.empty()) { // free the local rendering buffers
194			if (pChannelLeft) delete pChannelLeft;
195			if (pChannelRight) delete pChannelRight;
196			}
197			pChannelLeft = NULL;
198			pChannelRight = NULL;
199			}
200			}
201
202			class ClearEventListsHandler : public MidiKeyboardManager<V>::VoiceHandlerBase {
203			public:
204			virtual bool Process(MidiKey* pMidiKey) { pMidiKey->pEvents->clear(); return false; }
205			};
206
207			void ClearEventLists() {
208			pEvents->clear();
209			// empty MIDI key specific event lists
210			ClearEventListsHandler handler;
211			ProcessActiveVoices(&handler);
212	persson	2114
213			// empty exclusive group specific event lists
214			ClearGroupEventLists();
215	iliev	2012	}
216
217			// implementation of abstract methods derived from interface class 'InstrumentConsumer'
218
219			/**
220			* Will be called by the InstrumentResourceManager when the instrument
221			* we are currently using on this EngineChannel is going to be updated,
222			* so we can stop playback before that happens.
223			*/
224			virtual void ResourceToBeUpdated(I* pResource, void*& pUpdateArg) {
225			dmsg(3,("EngineChannelBase: Received instrument update message.\n"));
226			if (pEngine) pEngine->DisableAndLock();
227			ResetInternal();
228			this->pInstrument = NULL;
229			}
230
231			/**
232			* Will be called by the InstrumentResourceManager when the instrument
233			* update process was completed, so we can continue with playback.
234			*/
235			virtual void ResourceUpdated(I* pOldResource, I* pNewResource, void* pUpdateArg) {
236			this->pInstrument = pNewResource; //TODO: there are couple of engine parameters we should update here as well if the instrument was updated (see LoadInstrument())
237			if (pEngine) pEngine->Enable();
238			bStatusChanged = true; // status of engine has changed, so set notify flag
239			}
240
241			/**
242			* Will be called by the InstrumentResourceManager on progress changes
243			* while loading or realoading an instrument for this EngineChannel.
244			*
245			* @param fProgress - current progress as value between 0.0 and 1.0
246			*/
247			virtual void OnResourceProgress(float fProgress) {
248			this->InstrumentStat = int(fProgress * 100.0f);
249			dmsg(7,("EngineChannelBase: progress %d%", InstrumentStat));
250			bStatusChanged = true; // status of engine has changed, so set notify flag
251			}
252
253			void RenderActiveVoices(uint Samples) {
254			RenderVoicesHandler handler(this, Samples);
255			ProcessActiveVoices(&handler);
256
257			SetVoiceCount(handler.VoiceCount);
258			SetDiskStreamCount(handler.StreamCount);
259			}
260
261			RTList<R> pRegionsInUse; ///< temporary pointer into the instrument change command, used by the audio thread
262			I* pInstrument;
263
264			template<class TV, class TRR, class TR, class TD, class TIM, class TI> friend class EngineBase;
265
266			protected:
267			EngineChannelBase() : InstrumentChangeCommandReader(InstrumentChangeCommand) {
268			pInstrument = NULL;
269
270			// reset the instrument change command struct (need to be done
271			// twice, as it is double buffered)
272			{
273			InstrumentChangeCmd<R, I>& cmd = InstrumentChangeCommand.GetConfigForUpdate();
274			cmd.pRegionsInUse = NULL;
275			cmd.pInstrument = NULL;
276			cmd.bChangeInstrument = false;
277			}
278			{
279			InstrumentChangeCmd<R, I>& cmd = InstrumentChangeCommand.SwitchConfig();
280			cmd.pRegionsInUse = NULL;
281			cmd.pInstrument = NULL;
282			cmd.bChangeInstrument = false;
283			}
284			}
285
286			virtual ~EngineChannelBase() { }
287
288			typedef typename RTList<V>::Iterator RTListVoiceIterator;
289
290			class RenderVoicesHandler : public MidiKeyboardManager<V>::VoiceHandlerBase {
291			public:
292			uint Samples;
293			uint VoiceCount;
294			uint StreamCount;
295			EngineChannelBase<V, R, I>* pChannel;
296
297			RenderVoicesHandler(EngineChannelBase<V, R, I>* channel, uint samples) :
298			pChannel(channel), Samples(samples), VoiceCount(0), StreamCount(0) { }
299
300			virtual void Process(RTListVoiceIterator& itVoice) {
301			// now render current voice
302			itVoice->Render(Samples);
303			if (itVoice->IsActive()) { // still active
304			if (!itVoice->Orphan) {
305			*(pChannel->pRegionsInUse->allocAppend()) = itVoice->GetRegion();
306			}
307			VoiceCount++;
308
309			if (itVoice->PlaybackState == Voice::playback_state_disk) {
310			if ((itVoice->DiskStreamRef).State != Stream::state_unused) StreamCount++;
311			}
312			} else { // voice reached end, is now inactive
313			pChannel->FreeVoice(itVoice); // remove voice from the list of active voices
314			}
315			}
316			};
317
318			typedef typename SynchronizedConfig<InstrumentChangeCmd<R, I> >::Reader SyncConfInstrChangeCmdReader;
319
320			SynchronizedConfig<InstrumentChangeCmd<R, I> > InstrumentChangeCommand;
321			SyncConfInstrChangeCmdReader InstrumentChangeCommandReader;
322
323			/** This method is not thread safe! */
324			virtual void ResetInternal() {
325			AbstractEngineChannel::ResetInternal();
326
327			MidiKeyboardManager<V>::Reset();
328			}
329
330			virtual void ResetControllers() {
331			AbstractEngineChannel::ResetControllers();
332
333			MidiKeyboardManager<V>::SustainPedal = false;
334			MidiKeyboardManager<V>::SostenutoPedal = false;
335			}
336
337			/**
338			* Changes the instrument for an engine channel.
339			*
340			* @param pInstrument - new instrument
341			* @returns the resulting instrument change command after the
342			* command switch, containing the old instrument and
343			* the dimregions it is using
344			*/
345			InstrumentChangeCmd<R, I>& ChangeInstrument(I* pInstrument) {
346			InstrumentChangeCmd<R, I>& cmd = InstrumentChangeCommand.GetConfigForUpdate();
347			cmd.pInstrument = pInstrument;
348			cmd.bChangeInstrument = true;
349
350			return InstrumentChangeCommand.SwitchConfig();
351			}
352
353			virtual void ProcessKeySwitchChange(int key) = 0;
354			};
355
356			} // namespace LinuxSampler
357
358			#endif /* __LS_ENGINECHANNELBASE_H__ */