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) 2009-2012 Christian Schoenebeck and Grigor Iliev        *
 *   Copyright (C) 2012-2016 Christian Schoenebeck and Andreas Persson     *
 *                                                                         *
 *   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.
            InstrumentScript* pScript; ///< Instrument script to be executed for this instrument. This is never NULL, it is always a valid InstrumentScript pointer. Use InstrumentScript::bHasValidScript whether it reflects a valid instrument script to be executed.
    };

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

    template<class V>
    class NotePool {
        public:
            virtual Pool<V>* GetVoicePool() = 0;
            virtual Pool< Note<V> >* GetNotePool() = 0;
            virtual Pool<note_id_t>* GetNodeIDPool() = 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< Note<V> >::Iterator NoteIterator;
            typedef typename RTList<R*>::Iterator RTListRegionIterator;
            typedef typename MidiKeyboardManager<V>::MidiKey MidiKey;

            virtual MidiKeyboardManagerBase* GetMidiKeyboardManager() OVERRIDE {
                return this;
            }

            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) cmd.pRegionsInUse->clear();
                    cmd.bChangeInstrument = false;
                }
                {
                    InstrumentChangeCmd<R, I>& cmd = InstrumentChangeCommand.SwitchConfig();
                    if (cmd.pRegionsInUse) cmd.pRegionsInUse->clear();
                    cmd.bChangeInstrument = false;
                }
            }

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

            virtual void DeleteRegionsInUse() {
                RTList<R*>* previous = NULL; // prevent double free
                {
                    InstrumentChangeCmd<R, I>& cmd = InstrumentChangeCommand.GetConfigForUpdate();
                    if (cmd.pRegionsInUse) {
                        previous = cmd.pRegionsInUse;
                        delete cmd.pRegionsInUse;
                        cmd.pRegionsInUse = NULL;
                    }
                    cmd.bChangeInstrument = false;
                }
                {
                    InstrumentChangeCmd<R, I>& cmd = InstrumentChangeCommand.SwitchConfig();
                    if (cmd.pRegionsInUse) {
                        if (cmd.pRegionsInUse != previous)
                            delete cmd.pRegionsInUse;
                        cmd.pRegionsInUse = NULL;
                    }
                    cmd.bChangeInstrument = false;
                }
            }

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

            virtual void Connect(AudioOutputDevice* pAudioOut) {
                if (pEngine) {
                    if (pEngine->pAudioOutputDevice == pAudioOut) return;
                    DisconnectAudioOutputDevice();
                }
                AbstractEngine* newEngine = AbstractEngine::AcquireEngine(this, pAudioOut);
                {
                    LockGuard lock(EngineMutex);
                    pEngine = newEngine;
                }
                ResetInternal(false/*don't reset engine*/); // 'false' is error prone here, but the danger of recursion with 'true' would be worse, there could be a better solution though
                pEvents = new RTList<Event>(pEngine->pEventPool);
                delayedEvents.pList = 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;
                }

                NotePool<V>* pNotePool = dynamic_cast<NotePool<V>*>(pEngine);
                MidiKeyboardManager<V>::AllocateActiveNotesLists(
                    pNotePool->GetNotePool(),
                    pNotePool->GetVoicePool()
                );
                MidiKeyboardManager<V>::AllocateEventsLists(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(false/*don't reset engine*/); // 'false' is error prone here, but the danger of recursion with 'true' would be worse, there could be a better solution though

                    DeleteRegionsInUse();
                    UnloadScriptInUse();

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

                    if (pEvents) {
                        delete pEvents;
                        pEvents = NULL;
                    }
                    if (delayedEvents.pList) {
                        delete delayedEvents.pList;
                        delayedEvents.pList = NULL;
                    }

                    MidiKeyboardManager<V>::DeleteActiveNotesLists();
                    MidiKeyboardManager<V>::DeleteEventsLists();
                    DeleteGroupEventLists();

                    AudioOutputDevice* oldAudioDevice = pEngine->pAudioOutputDevice;
                    {
                        LockGuard lock(EngineMutex);
                        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; }
            };

            /**
             * Free all events of the current audio fragment cycle. Calling
             * this method will @b NOT free events scheduled past the current
             * fragment's boundary! (@see AbstractEngineChannel::delayedEvents).
             */
            void ClearEventListsOfCurrentFragment() {
                pEvents->clear();
                // empty MIDI key specific event lists
                ClearEventListsHandler handler;
                this->ProcessActiveVoices(&handler);

                // empty exclusive group specific event lists
                // (pInstrument == 0 could mean that LoadInstrument is
                // building new group event lists, so we must check
                // for that)
                if (pInstrument) 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) OVERRIDE {
                dmsg(3,("EngineChannelBase: Received instrument update message.\n"));
                if (pEngine) pEngine->DisableAndLock();
                ResetInternal(false/*don't reset engine*/);
                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) OVERRIDE {
                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) OVERRIDE {
                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);
                this->ProcessActiveVoices(&handler);

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

            /**
             * Called by real-time instrument script functions to schedule a
             * new note (new note-on event and a new @c Note object linked to it)
             * @a delay microseconds in future.
             * 
             * @b IMPORTANT: for the supplied @a delay to be scheduled
             * correctly, the passed @a pEvent must be assigned a valid
             * fragment time within the current audio fragment boundaries. That
             * fragment time will be used by this method as basis for
             * interpreting what "now" acutally is, and thus it will be used as
             * basis for calculating the precise scheduling time for @a delay.
             * The easiest way to achieve this is by copying a recent event
             * which happened within the current audio fragment cycle: i.e. the
             * original event which caused calling this method here, or by using
             * Event::copyTimefrom() method to only copy the time, without any
             * other event data.
             *
             * @param pEvent - note-on event to be scheduled in future (event
             *                 data will be copied)
             * @param delay - amount of microseconds in future (from now) when
             *                event shall be processed
             * @returns unique note ID of scheduled new note, or NULL on error
             */
            note_id_t ScheduleNoteMicroSec(const Event* pEvent, int delay) OVERRIDE {
                // add (copied) note-on event into scheduler queue
                const event_id_t noteOnEventID = ScheduleEventMicroSec(pEvent, delay);
                if (!noteOnEventID) return 0; // error
                // get access to (copied) event on the scheduler queue
                RTList<Event>::Iterator itEvent = pEvents->fromID(noteOnEventID);
                // stick a new note to the (copied) event on the queue
                const note_id_t noteID = pEngine->LaunchNewNote(this, &*itEvent);
                return noteID;
            }

            /**
             * Called by real-time instrument script functions to ignore the note
             * reflected by given note ID. The note's event will be freed immediately
             * to its event pool and this will prevent voices to be launched for the
             * note.
             *
             * NOTE: preventing a note by calling this method works only if the note
             * was launched within the current audio fragment cycle.
             *
             * @param id - unique ID of note to be dropped
             */
            void IgnoreNote(note_id_t id) OVERRIDE {
                Pool< Note<V> >* pNotePool =
                    dynamic_cast<NotePool<V>*>(pEngine)->GetNotePool();

                NoteIterator itNote = pNotePool->fromID(id);
                if (!itNote) return; // note probably already released

                // if the note already got active voices, then it is too late to drop it
                if (!itNote->pActiveVoices->isEmpty()) return;

                // if the original (note-on) event is not available anymore, then it is too late to drop it
                RTList<Event>::Iterator itEvent = pEvents->fromID(itNote->eventID);
                if (!itEvent) return;

                // drop the note
                pNotePool->free(itNote);

                // drop the original event
                pEvents->free(itEvent);
            }

            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() :
                MidiKeyboardManager<V>(this),
                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.pScript = new InstrumentScript(this);
                    cmd.bChangeInstrument = false;
                }
                {
                    InstrumentChangeCmd<R, I>& cmd = InstrumentChangeCommand.SwitchConfig();
                    cmd.pRegionsInUse = NULL;
                    cmd.pInstrument = NULL;
                    cmd.pScript = new InstrumentScript(this);
                    cmd.bChangeInstrument = false;
                }
            }

            virtual ~EngineChannelBase() {
                InstrumentScript* previous = NULL; // prevent double free
                {
                    InstrumentChangeCmd<R, I>& cmd = InstrumentChangeCommand.GetConfigForUpdate();
                    if (cmd.pScript) {
                        previous = cmd.pScript;
                        delete cmd.pScript;
                        cmd.pScript = NULL;
                    }
                }
                {
                    InstrumentChangeCmd<R, I>& cmd = InstrumentChangeCommand.SwitchConfig();
                    if (cmd.pScript) {
                        if (previous != cmd.pScript)
                            delete cmd.pScript;
                        cmd.pScript = NULL;
                    }
                }
            }

            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
                            itVoice->VoiceFreed();
                            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(bool bResetEngine) OVERRIDE {
                AbstractEngineChannel::ResetInternal(bResetEngine);

                MidiKeyboardManager<V>::Reset();
            }

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

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

            /**
             * Unload the currently used and loaded real-time instrument script.
             * The source code of the script is retained, so that it can still
             * be reloaded.
             */
            void UnloadScriptInUse() {
                {
                    InstrumentChangeCmd<R, I>& cmd = InstrumentChangeCommand.GetConfigForUpdate();
                    if (cmd.pScript) cmd.pScript->unload();
                }
                {
                    InstrumentChangeCmd<R, I>& cmd = InstrumentChangeCommand.SwitchConfig();
                    if (cmd.pScript) cmd.pScript->unload();
                }
                InstrumentChangeCommand.SwitchConfig(); // switch back to original one
            }

            /**
             * Load real-time instrument script and all its resources required
             * for the upcoming instrument change.
             *
             * @param text - source code of script
             */
            void LoadInstrumentScript(const String& text) {
                InstrumentChangeCmd<R, I>& cmd = InstrumentChangeCommand.GetConfigForUpdate();
                // load the new script
                cmd.pScript->load(text);
            }

            /**
             * 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	/***************************************************************************
2	* *
3	* LinuxSampler - modular, streaming capable sampler *
4	* *
5	* Copyright (C) 2003,2004 by Benno Senoner and Christian Schoenebeck *
6	* Copyright (C) 2005-2008 Christian Schoenebeck *
7	* Copyright (C) 2009-2012 Christian Schoenebeck and Grigor Iliev *
8	* Copyright (C) 2012-2016 Christian Schoenebeck and Andreas Persson *
9	* *
10	* This program is free software; you can redistribute it and/or modify *
11	* it under the terms of the GNU General Public License as published by *
12	* the Free Software Foundation; either version 2 of the License, or *
13	* (at your option) any later version. *
14	* *
15	* This program is distributed in the hope that it will be useful, *
16	* but WITHOUT ANY WARRANTY; without even the implied warranty of *
17	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
18	* GNU General Public License for more details. *
19	* *
20	* You should have received a copy of the GNU General Public License *
21	* along with this program; if not, write to the Free Software *
22	* Foundation, Inc., 59 Temple Place, Suite 330, Boston, *
23	* MA 02111-1307 USA *
24	***************************************************************************/
25
26	#ifndef __LS_ENGINECHANNELBASE_H__
27	#define __LS_ENGINECHANNELBASE_H__
28
29	#include "AbstractEngineChannel.h"
30	#include "common/MidiKeyboardManager.h"
31	#include "common/Voice.h"
32	#include "../common/ResourceManager.h"
33
34	namespace LinuxSampler {
35	/// Command used by the instrument loader thread to
36	/// request an instrument change on a channel.
37	template <class R /* Region /, class I / Instrument */>
38	class InstrumentChangeCmd {
39	public:
40	bool bChangeInstrument; ///< Set to true by the loader when the channel should change instrument.
41	I* pInstrument; ///< The new instrument. Also used by the loader to read the previously loaded instrument.
42	RTList<R> pRegionsInUse; ///< List of dimension regions in use by the currently loaded instrument. Continuously updated by the audio thread.
43	InstrumentScript* pScript; ///< Instrument script to be executed for this instrument. This is never NULL, it is always a valid InstrumentScript pointer. Use InstrumentScript::bHasValidScript whether it reflects a valid instrument script to be executed.
44	};
45
46	template<class R>
47	class RegionPools {
48	public:
49	virtual Pool<R> GetRegionPool(int index) = 0;
50	};
51
52	template<class V>
53	class NotePool {
54	public:
55	virtual Pool<V>* GetVoicePool() = 0;
56	virtual Pool< Note<V> >* GetNotePool() = 0;
57	virtual Pool<note_id_t>* GetNodeIDPool() = 0;
58	};
59
60	template <class V /* Voice /, class R / Region /, class I / Instrument */>
61	class EngineChannelBase: public AbstractEngineChannel, public MidiKeyboardManager<V>, public ResourceConsumer<I> {
62	public:
63	typedef typename RTList< Note<V> >::Iterator NoteIterator;
64	typedef typename RTList<R*>::Iterator RTListRegionIterator;
65	typedef typename MidiKeyboardManager<V>::MidiKey MidiKey;
66
67	virtual MidiKeyboardManagerBase* GetMidiKeyboardManager() OVERRIDE {
68	return this;
69	}
70
71	virtual void HandBack(I* Instrument) {
72	ResourceManager<InstrumentManager::instrument_id_t, I>* mgr =
73	dynamic_cast<ResourceManager<InstrumentManager::instrument_id_t, I>*>(pEngine->GetInstrumentManager());
74	mgr->HandBack(Instrument, this);
75	}
76
77	virtual void ClearRegionsInUse() {
78	{
79	InstrumentChangeCmd<R, I>& cmd = InstrumentChangeCommand.GetConfigForUpdate();
80	if (cmd.pRegionsInUse) cmd.pRegionsInUse->clear();
81	cmd.bChangeInstrument = false;
82	}
83	{
84	InstrumentChangeCmd<R, I>& cmd = InstrumentChangeCommand.SwitchConfig();
85	if (cmd.pRegionsInUse) cmd.pRegionsInUse->clear();
86	cmd.bChangeInstrument = false;
87	}
88	}
89
90	virtual void ResetRegionsInUse(Pool<R> pRegionPool[]) {
91	DeleteRegionsInUse();
92	AllocateRegionsInUse(pRegionPool);
93	}
94
95	virtual void DeleteRegionsInUse() {
96	RTList<R> previous = NULL; // prevent double free
97	{
98	InstrumentChangeCmd<R, I>& cmd = InstrumentChangeCommand.GetConfigForUpdate();
99	if (cmd.pRegionsInUse) {
100	previous = cmd.pRegionsInUse;
101	delete cmd.pRegionsInUse;
102	cmd.pRegionsInUse = NULL;
103	}
104	cmd.bChangeInstrument = false;
105	}
106	{
107	InstrumentChangeCmd<R, I>& cmd = InstrumentChangeCommand.SwitchConfig();
108	if (cmd.pRegionsInUse) {
109	if (cmd.pRegionsInUse != previous)
110	delete cmd.pRegionsInUse;
111	cmd.pRegionsInUse = NULL;
112	}
113	cmd.bChangeInstrument = false;
114	}
115	}
116
117	virtual void AllocateRegionsInUse(Pool<R> pRegionPool[]) {
118	{
119	InstrumentChangeCmd<R, I>& cmd = InstrumentChangeCommand.GetConfigForUpdate();
120	cmd.pRegionsInUse = new RTList<R*>(pRegionPool[0]);
121	cmd.bChangeInstrument = false;
122	}
123	{
124	InstrumentChangeCmd<R, I>& cmd = InstrumentChangeCommand.SwitchConfig();
125	cmd.pRegionsInUse = new RTList<R*>(pRegionPool[1]);
126	cmd.bChangeInstrument = false;
127	}
128	}
129
130	virtual void Connect(AudioOutputDevice* pAudioOut) {
131	if (pEngine) {
132	if (pEngine->pAudioOutputDevice == pAudioOut) return;
133	DisconnectAudioOutputDevice();
134	}
135	AbstractEngine* newEngine = AbstractEngine::AcquireEngine(this, pAudioOut);
136	{
137	LockGuard lock(EngineMutex);
138	pEngine = newEngine;
139	}
140	ResetInternal(false/don't reset engine/); // 'false' is error prone here, but the danger of recursion with 'true' would be worse, there could be a better solution though
141	pEvents = new RTList<Event>(pEngine->pEventPool);
142	delayedEvents.pList = new RTList<Event>(pEngine->pEventPool);
143
144	RegionPools<R>* pRegionPool = dynamic_cast<RegionPools<R>*>(pEngine);
145	// reset the instrument change command struct (need to be done
146	// twice, as it is double buffered)
147	{
148	InstrumentChangeCmd<R, I>& cmd = InstrumentChangeCommand.GetConfigForUpdate();
149	cmd.pRegionsInUse = new RTList<R*>(pRegionPool->GetRegionPool(0));
150	cmd.pInstrument = 0;
151	cmd.bChangeInstrument = false;
152	}
153	{
154	InstrumentChangeCmd<R, I>& cmd = InstrumentChangeCommand.SwitchConfig();
155	cmd.pRegionsInUse = new RTList<R*>(pRegionPool->GetRegionPool(1));
156	cmd.pInstrument = 0;
157	cmd.bChangeInstrument = false;
158	}
159
160	if (pInstrument != NULL) {
161	pInstrument = NULL;
162	InstrumentStat = -1;
163	InstrumentIdx = -1;
164	InstrumentIdxName = "";
165	InstrumentFile = "";
166	bStatusChanged = true;
167	}
168
169	NotePool<V>* pNotePool = dynamic_cast<NotePool<V>*>(pEngine);
170	MidiKeyboardManager<V>::AllocateActiveNotesLists(
171	pNotePool->GetNotePool(),
172	pNotePool->GetVoicePool()
173	);
174	MidiKeyboardManager<V>::AllocateEventsLists(pEngine->pEventPool);
175
176	AudioDeviceChannelLeft = 0;
177	AudioDeviceChannelRight = 1;
178	if (fxSends.empty()) { // render directly into the AudioDevice's output buffers
179	pChannelLeft = pAudioOut->Channel(AudioDeviceChannelLeft);
180	pChannelRight = pAudioOut->Channel(AudioDeviceChannelRight);
181	} else { // use local buffers for rendering and copy later
182	// ensure the local buffers have the correct size
183	if (pChannelLeft) delete pChannelLeft;
184	if (pChannelRight) delete pChannelRight;
185	pChannelLeft = new AudioChannel(0, pAudioOut->MaxSamplesPerCycle());
186	pChannelRight = new AudioChannel(1, pAudioOut->MaxSamplesPerCycle());
187	}
188	if (pEngine->EngineDisabled.GetUnsafe()) pEngine->Enable();
189	MidiInputPort::AddSysexListener(pEngine);
190	}
191
192	virtual void DisconnectAudioOutputDevice() {
193	if (pEngine) { // if clause to prevent disconnect loops
194
195	ResetInternal(false/don't reset engine/); // 'false' is error prone here, but the danger of recursion with 'true' would be worse, there could be a better solution though
196
197	DeleteRegionsInUse();
198	UnloadScriptInUse();
199
200	InstrumentChangeCmd<R, I>& cmd = InstrumentChangeCommand.GetConfigForUpdate();
201	if (cmd.pInstrument) {
202	// release the currently loaded instrument
203	HandBack(cmd.pInstrument);
204	}
205
206	if (pEvents) {
207	delete pEvents;
208	pEvents = NULL;
209	}
210	if (delayedEvents.pList) {
211	delete delayedEvents.pList;
212	delayedEvents.pList = NULL;
213	}
214
215	MidiKeyboardManager<V>::DeleteActiveNotesLists();
216	MidiKeyboardManager<V>::DeleteEventsLists();
217	DeleteGroupEventLists();
218
219	AudioOutputDevice* oldAudioDevice = pEngine->pAudioOutputDevice;
220	{
221	LockGuard lock(EngineMutex);
222	pEngine = NULL;
223	}
224	AbstractEngine::FreeEngine(this, oldAudioDevice);
225	AudioDeviceChannelLeft = -1;
226	AudioDeviceChannelRight = -1;
227	if (!fxSends.empty()) { // free the local rendering buffers
228	if (pChannelLeft) delete pChannelLeft;
229	if (pChannelRight) delete pChannelRight;
230	}
231	pChannelLeft = NULL;
232	pChannelRight = NULL;
233	}
234	}
235
236	class ClearEventListsHandler : public MidiKeyboardManager<V>::VoiceHandlerBase {
237	public:
238	virtual bool Process(MidiKey* pMidiKey) { pMidiKey->pEvents->clear(); return false; }
239	};
240
241	/**
242	* Free all events of the current audio fragment cycle. Calling
243	* this method will @b NOT free events scheduled past the current
244	* fragment's boundary! (@see AbstractEngineChannel::delayedEvents).
245	*/
246	void ClearEventListsOfCurrentFragment() {
247	pEvents->clear();
248	// empty MIDI key specific event lists
249	ClearEventListsHandler handler;
250	this->ProcessActiveVoices(&handler);
251
252	// empty exclusive group specific event lists
253	// (pInstrument == 0 could mean that LoadInstrument is
254	// building new group event lists, so we must check
255	// for that)
256	if (pInstrument) ClearGroupEventLists();
257	}
258
259	// implementation of abstract methods derived from interface class 'InstrumentConsumer'
260
261	/**
262	* Will be called by the InstrumentResourceManager when the instrument
263	* we are currently using on this EngineChannel is going to be updated,
264	* so we can stop playback before that happens.
265	*/
266	virtual void ResourceToBeUpdated(I* pResource, void*& pUpdateArg) OVERRIDE {
267	dmsg(3,("EngineChannelBase: Received instrument update message.\n"));
268	if (pEngine) pEngine->DisableAndLock();
269	ResetInternal(false/don't reset engine/);
270	this->pInstrument = NULL;
271	}
272
273	/**
274	* Will be called by the InstrumentResourceManager when the instrument
275	* update process was completed, so we can continue with playback.
276	*/
277	virtual void ResourceUpdated(I* pOldResource, I* pNewResource, void* pUpdateArg) OVERRIDE {
278	this->pInstrument = pNewResource; //TODO: there are couple of engine parameters we should update here as well if the instrument was updated (see LoadInstrument())
279	if (pEngine) pEngine->Enable();
280	bStatusChanged = true; // status of engine has changed, so set notify flag
281	}
282
283	/**
284	* Will be called by the InstrumentResourceManager on progress changes
285	* while loading or realoading an instrument for this EngineChannel.
286	*
287	* @param fProgress - current progress as value between 0.0 and 1.0
288	*/
289	virtual void OnResourceProgress(float fProgress) OVERRIDE {
290	this->InstrumentStat = int(fProgress * 100.0f);
291	dmsg(7,("EngineChannelBase: progress %d%%", InstrumentStat));
292	bStatusChanged = true; // status of engine has changed, so set notify flag
293	}
294
295	void RenderActiveVoices(uint Samples) {
296	RenderVoicesHandler handler(this, Samples);
297	this->ProcessActiveVoices(&handler);
298
299	SetVoiceCount(handler.VoiceCount);
300	SetDiskStreamCount(handler.StreamCount);
301	}
302
303	/**
304	* Called by real-time instrument script functions to schedule a
305	* new note (new note-on event and a new @c Note object linked to it)
306	* @a delay microseconds in future.
307	*
308	* @b IMPORTANT: for the supplied @a delay to be scheduled
309	* correctly, the passed @a pEvent must be assigned a valid
310	* fragment time within the current audio fragment boundaries. That
311	* fragment time will be used by this method as basis for
312	* interpreting what "now" acutally is, and thus it will be used as
313	* basis for calculating the precise scheduling time for @a delay.
314	* The easiest way to achieve this is by copying a recent event
315	* which happened within the current audio fragment cycle: i.e. the
316	* original event which caused calling this method here, or by using
317	* Event::copyTimefrom() method to only copy the time, without any
318	* other event data.
319	*
320	* @param pEvent - note-on event to be scheduled in future (event
321	* data will be copied)
322	* @param delay - amount of microseconds in future (from now) when
323	* event shall be processed
324	* @returns unique note ID of scheduled new note, or NULL on error
325	*/
326	note_id_t ScheduleNoteMicroSec(const Event* pEvent, int delay) OVERRIDE {
327	// add (copied) note-on event into scheduler queue
328	const event_id_t noteOnEventID = ScheduleEventMicroSec(pEvent, delay);
329	if (!noteOnEventID) return 0; // error
330	// get access to (copied) event on the scheduler queue
331	RTList<Event>::Iterator itEvent = pEvents->fromID(noteOnEventID);
332	// stick a new note to the (copied) event on the queue
333	const note_id_t noteID = pEngine->LaunchNewNote(this, &*itEvent);
334	return noteID;
335	}
336
337	/**
338	* Called by real-time instrument script functions to ignore the note
339	* reflected by given note ID. The note's event will be freed immediately
340	* to its event pool and this will prevent voices to be launched for the
341	* note.
342	*
343	* NOTE: preventing a note by calling this method works only if the note
344	* was launched within the current audio fragment cycle.
345	*
346	* @param id - unique ID of note to be dropped
347	*/
348	void IgnoreNote(note_id_t id) OVERRIDE {
349	Pool< Note<V> >* pNotePool =
350	dynamic_cast<NotePool<V>*>(pEngine)->GetNotePool();
351
352	NoteIterator itNote = pNotePool->fromID(id);
353	if (!itNote) return; // note probably already released
354
355	// if the note already got active voices, then it is too late to drop it
356	if (!itNote->pActiveVoices->isEmpty()) return;
357
358	// if the original (note-on) event is not available anymore, then it is too late to drop it
359	RTList<Event>::Iterator itEvent = pEvents->fromID(itNote->eventID);
360	if (!itEvent) return;
361
362	// drop the note
363	pNotePool->free(itNote);
364
365	// drop the original event
366	pEvents->free(itEvent);
367	}
368
369	RTList<R> pRegionsInUse; ///< temporary pointer into the instrument change command, used by the audio thread
370	I* pInstrument;
371
372	template<class TV, class TRR, class TR, class TD, class TIM, class TI> friend class EngineBase;
373
374	protected:
375	EngineChannelBase() :
376	MidiKeyboardManager<V>(this),
377	InstrumentChangeCommandReader(InstrumentChangeCommand)
378	{
379	pInstrument = NULL;
380
381	// reset the instrument change command struct (need to be done
382	// twice, as it is double buffered)
383	{
384	InstrumentChangeCmd<R, I>& cmd = InstrumentChangeCommand.GetConfigForUpdate();
385	cmd.pRegionsInUse = NULL;
386	cmd.pInstrument = NULL;
387	cmd.pScript = new InstrumentScript(this);
388	cmd.bChangeInstrument = false;
389	}
390	{
391	InstrumentChangeCmd<R, I>& cmd = InstrumentChangeCommand.SwitchConfig();
392	cmd.pRegionsInUse = NULL;
393	cmd.pInstrument = NULL;
394	cmd.pScript = new InstrumentScript(this);
395	cmd.bChangeInstrument = false;
396	}
397	}
398
399	virtual ~EngineChannelBase() {
400	InstrumentScript* previous = NULL; // prevent double free
401	{
402	InstrumentChangeCmd<R, I>& cmd = InstrumentChangeCommand.GetConfigForUpdate();
403	if (cmd.pScript) {
404	previous = cmd.pScript;
405	delete cmd.pScript;
406	cmd.pScript = NULL;
407	}
408	}
409	{
410	InstrumentChangeCmd<R, I>& cmd = InstrumentChangeCommand.SwitchConfig();
411	if (cmd.pScript) {
412	if (previous != cmd.pScript)
413	delete cmd.pScript;
414	cmd.pScript = NULL;
415	}
416	}
417	}
418
419	typedef typename RTList<V>::Iterator RTListVoiceIterator;
420
421	class RenderVoicesHandler : public MidiKeyboardManager<V>::VoiceHandlerBase {
422	public:
423	uint Samples;
424	uint VoiceCount;
425	uint StreamCount;
426	EngineChannelBase<V, R, I>* pChannel;
427
428	RenderVoicesHandler(EngineChannelBase<V, R, I>* channel, uint samples) :
429	pChannel(channel), Samples(samples), VoiceCount(0), StreamCount(0) { }
430
431	virtual void Process(RTListVoiceIterator& itVoice) {
432	// now render current voice
433	itVoice->Render(Samples);
434	if (itVoice->IsActive()) { // still active
435	if (!itVoice->Orphan) {
436	*(pChannel->pRegionsInUse->allocAppend()) = itVoice->GetRegion();
437	}
438	VoiceCount++;
439
440	if (itVoice->PlaybackState == Voice::playback_state_disk) {
441	if ((itVoice->DiskStreamRef).State != Stream::state_unused) StreamCount++;
442	}
443	} else { // voice reached end, is now inactive
444	itVoice->VoiceFreed();
445	pChannel->FreeVoice(itVoice); // remove voice from the list of active voices
446	}
447	}
448	};
449
450	typedef typename SynchronizedConfig<InstrumentChangeCmd<R, I> >::Reader SyncConfInstrChangeCmdReader;
451
452	SynchronizedConfig<InstrumentChangeCmd<R, I> > InstrumentChangeCommand;
453	SyncConfInstrChangeCmdReader InstrumentChangeCommandReader;
454
455	/** This method is not thread safe! */
456	virtual void ResetInternal(bool bResetEngine) OVERRIDE {
457	AbstractEngineChannel::ResetInternal(bResetEngine);
458
459	MidiKeyboardManager<V>::Reset();
460	}
461
462	virtual void ResetControllers() {
463	AbstractEngineChannel::ResetControllers();
464
465	MidiKeyboardManager<V>::SustainPedal = false;
466	MidiKeyboardManager<V>::SostenutoPedal = false;
467	}
468
469	/**
470	* Unload the currently used and loaded real-time instrument script.
471	* The source code of the script is retained, so that it can still
472	* be reloaded.
473	*/
474	void UnloadScriptInUse() {
475	{
476	InstrumentChangeCmd<R, I>& cmd = InstrumentChangeCommand.GetConfigForUpdate();
477	if (cmd.pScript) cmd.pScript->unload();
478	}
479	{
480	InstrumentChangeCmd<R, I>& cmd = InstrumentChangeCommand.SwitchConfig();
481	if (cmd.pScript) cmd.pScript->unload();
482	}
483	InstrumentChangeCommand.SwitchConfig(); // switch back to original one
484	}
485
486	/**
487	* Load real-time instrument script and all its resources required
488	* for the upcoming instrument change.
489	*
490	* @param text - source code of script
491	*/
492	void LoadInstrumentScript(const String& text) {
493	InstrumentChangeCmd<R, I>& cmd = InstrumentChangeCommand.GetConfigForUpdate();
494	// load the new script
495	cmd.pScript->load(text);
496	}
497
498	/**
499	* Changes the instrument for an engine channel.
500	*
501	* @param pInstrument - new instrument
502	* @returns the resulting instrument change command after the
503	* command switch, containing the old instrument and
504	* the dimregions it is using
505	*/
506	InstrumentChangeCmd<R, I>& ChangeInstrument(I* pInstrument) {
507	InstrumentChangeCmd<R, I>& cmd = InstrumentChangeCommand.GetConfigForUpdate();
508	cmd.pInstrument = pInstrument;
509	cmd.bChangeInstrument = true;
510
511	return InstrumentChangeCommand.SwitchConfig();
512	}
513
514	virtual void ProcessKeySwitchChange(int key) = 0;
515	};
516
517	} // namespace LinuxSampler
518
519	#endif /* __LS_ENGINECHANNELBASE_H__ */