/[svn]/linuxsampler/trunk/src/Sampler.h
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revision 53 by schoenebeck, Mon Apr 26 17:15:51 2004 UTC revision 2375 by schoenebeck, Thu Oct 4 17:45:22 2012 UTC
# Line 2  Line 2 
2   *                                                                         *   *                                                                         *
3   *   LinuxSampler - modular, streaming capable sampler                     *   *   LinuxSampler - modular, streaming capable sampler                     *
4   *                                                                         *   *                                                                         *
5   *   Copyright (C) 2003 by Benno Senoner and Christian Schoenebeck         *   *   Copyright (C) 2003, 2004 by Benno Senoner and Christian Schoenebeck   *
6     *   Copyright (C) 2005 - 2012 Christian Schoenebeck                       *
7   *                                                                         *   *                                                                         *
8   *   This program is free software; you can redistribute it and/or modify  *   *   This program is free software; you can redistribute it and/or modify  *
9   *   it under the terms of the GNU General Public License as published by  *   *   it under the terms of the GNU General Public License as published by  *
# Line 25  Line 26 
26    
27  #include <vector>  #include <vector>
28  #include <map>  #include <map>
29    #include "EventListeners.h"
30  #include "common/global.h"  #include "common/global.h"
31  #include "common/LinuxSamplerException.h"  #include "common/Exception.h"
32  #include "engines/common/Engine.h"  #include "engines/EngineChannel.h"
33  #include "mididriver/MidiInputDevice.h"  #include "drivers/midi/MidiInputDevice.h"
34  #include "audiodriver/AudioOutputDevice.h"  #include "drivers/audio/AudioOutputDevice.h"
35    
36  namespace LinuxSampler {  namespace LinuxSampler {
37    
     /**  
      * Which sampler engine to be used.  
      */  
     enum engine_type_t {  
         engine_type_gig  
     };  
   
     /**  
      * Which audio output system to be used.  
      */  
     enum audio_output_type_t {  
         audio_output_type_alsa,  
         audio_output_type_jack  
     };  
   
     /**  
      * Which MIDI input system to be used.  
      */  
     enum midi_input_type_t {  
         midi_input_type_alsa  
     };  
   
38      // just symbol prototyping      // just symbol prototyping
39      class Sampler;      class Sampler;
40    
41        /** @brief LinuxSampler sampler channel
42         *
43         * Encapsulates a channel of a specific sampler engine type, one
44         * connection to a MIDI input device and one connection to an audio
45         * output device. You cannot create an instance of this class on your
46         * own, you have to use the AddSamplerChannel() method of the Sampler
47         * object to create a new sampler channel.
48         */
49      class SamplerChannel {      class SamplerChannel {
50          public:          public:
51              SamplerChannel(Sampler* pS);              /**
52             ~SamplerChannel();               * Assign a sampler engine type to this sampler channel.
53              void               LoadEngine(engine_type_t EngineType);               *
54              void               SetAudioOutputDevice(audio_output_type_t AudioType);               * @param EngineType - type of the engine to use
55              void               SetMidiInputDevice(midi_input_type_t MidiType, MidiInputDevice::midi_chan_t MidiChannel = MidiInputDevice::midi_chan_all);               * @throws Exception - if \a EngineType is invalid
56              Engine*            GetEngine();               * @see Sampler::AvailableEngineTypes()
57              MidiInputDevice*   GetMidiInputDevice();               */
58                void SetEngineType(String EngineType) throw (Exception);
59    
60                /**
61                 * Connect this sampler channel to an audio output device, that
62                 * is an instance of an audio output driver. If this sampler
63                 * channel was already connected to an audio output device, then
64                 * the old connection will automatically be removed before.
65                 *
66                 * @param pDevice - audio output device to connect to
67                 * @throws Exception in case the audio device is tried to be
68                 *                   changed while the sampler channel is used by a
69                 *                   host plugin (e.g. VST, AU, DSSI, LV2) which
70                 *                   don't allow to change the audio output device
71                 */
72                void SetAudioOutputDevice(AudioOutputDevice* pDevice) throw (Exception);
73    
74                /**
75                 * Connect this sampler channel to a MIDI input device.
76                 *
77                 * @param pDevice - MIDI input device to connect to
78                 * @throws Exception in case the MIDI device is tried to be changed
79                 *                   while the sampler channel is being used by a
80                 *                   host plugin (e.g. VST, AU, DSSI, LV2) which
81                 *                   don't allow to change the MIDI port or even
82                 *                   device
83                 */
84                void SetMidiInputDevice(MidiInputDevice *pDevice) throw (Exception);
85    
86                /**
87                 * Connect this sampler channel to a MIDI input port.
88                 *
89                 * @param MidiPort - MIDI port to connect to
90                 * @throws Exception in case the MIDI port is tried to be changed
91                 *                   while the sampler channel is being used by a
92                 *                   host plugin (e.g. VST, AU, DSSI, LV2) which
93                 *                   don't allow to change the MIDI port
94                 */
95                void SetMidiInputPort(int MidiPort) throw (Exception);
96    
97                /**
98                 * Define on which MIDI channel(s) this sampler channel should
99                 * listen to. By default, that is after creation of a new
100                 * sampler channel, the sampler channel will listen to all MIDI
101                 * channels.
102                 *
103                 * @param MidiChannel - MIDI channel to listen
104                 */
105                void SetMidiInputChannel(midi_chan_t MidiChannel);
106    
107                /**
108                 * Connect this sampler channel to a MIDI input triplet.
109                 *
110                 * @param pDevice - MIDI input device to connect to
111                 * @param iMidiPort - MIDI port to connect to
112                 * @param MidiChannel - optional: MIDI channel on which the
113                 *                      sampler channel should listen to
114                 *                      (default: listen on all MIDI channels)
115                 * @throws Exception in case the MIDI port is tried to be changed
116                 *                   while the sampler channel is being used by a
117                 *                   host plugin (e.g. VST, AU, DSSI, LV2) which
118                 *                   don't allow to change the MIDI port
119                 */
120                void SetMidiInput(MidiInputDevice* pDevice, int iMidiPort, midi_chan_t MidiChannel = midi_chan_all) throw (Exception);
121    
122                /**
123                 * Returns the EngineChannel object that was deployed on this
124                 * sampler channel appropriate to the given sampler engine type.
125                 *
126                 * @returns  pointer to engine or NULL if no engine deployed
127                 */
128                EngineChannel* GetEngineChannel();
129    
130                /**
131                 * Returns the MIDI input channel to which this sampler
132                 * channel is currently connected to.
133                 *
134                 * @returns  The MIDI input channel on which the sampler
135                 *           channel is listening to.
136                 */
137                midi_chan_t GetMidiInputChannel();
138    
139                /**
140                 * Returns the MIDI input port number to which this sampler
141                 * channel is currently connected to.
142                 *
143                 * @returns  MIDI input port number or -1 if not connected
144                 */
145                int GetMidiInputPort();
146    
147                /**
148                 * Returns the audio output device to which this sampler channel
149                 * is currently connected to.
150                 *
151                 * @returns  pointer to audio output device or NULL if not
152                 *           connected
153                 */
154              AudioOutputDevice* GetAudioOutputDevice();              AudioOutputDevice* GetAudioOutputDevice();
155              uint               Index();  
156                /**
157                 * Returns the MIDI input device to which this sampler channel
158                 * is currently connected to.
159                 *
160                 * @returns  pointer to MIDI input device or NULL if not
161                 *           connected
162                 */
163                MidiInputDevice* GetMidiInputDevice();
164    
165                /**
166                 * Returns the index number of this sampler channel within the
167                 * Sampler instance.
168                 */
169                uint Index();
170    
171                /** Returns the sampler to which this channel belongs */
172                Sampler* GetSampler();
173    
174                ///////////////////////////////////////////////////////////////
175                // Event Listener methods
176    
177                /**
178                 * Registers the specified listener to be notified
179                 * when the engine type of this sampler channel is changed.
180                 */
181                void AddEngineChangeListener(EngineChangeListener* l);
182    
183                /**
184                 * Removes the specified listener.
185                 */
186                void RemoveEngineChangeListener(EngineChangeListener* l);
187    
188                /**
189                 * Removes the specified listener.
190                 */
191                void RemoveAllEngineChangeListeners();
192    
193                /**
194                 * Notifies listeners that the engine type of this sampler
195                 * channel is going to be changed soon.
196                 */
197                void fireEngineToBeChanged();
198    
199                /**
200                 * Notifies listeners that the engine
201                 * type of this sampler channel is changed.
202                 */
203                void fireEngineChanged();
204    
205    
206          protected:          protected:
207                SamplerChannel(Sampler* pS);
208                virtual ~SamplerChannel();
209    
210                /** Getting MIDI input device port given its index number. */
211                MidiInputPort* __GetMidiInputDevicePort(int iMidiPort);
212    
213              Sampler*           pSampler;              Sampler*           pSampler;
214              Engine*            pEngine;              EngineChannel*     pEngineChannel;
             MidiInputDevice*   pMidiInputDevice;  
215              AudioOutputDevice* pAudioOutputDevice;              AudioOutputDevice* pAudioOutputDevice;
216                MidiInputDevice*   pMidiInputDevice;
217              int                iIndex;              int                iIndex;
218    
219                friend class Sampler;
220            private:
221                int                iMidiPort;   ///< Don't access directly, read GetMidiInputPort() instead !
222                midi_chan_t        midiChannel; ///< Don't access directly, read GetMidiInputChannel() instead !
223                ListenerList<EngineChangeListener*> llEngineChangeListeners;
224      };      };
225    
226        /** @brief LinuxSampler main class
227         *
228         * This is the toplevel class for a LinuxSampler instance.
229         *
230         * LinuxSampler can have arbitrary numbers of sampler channels. Each
231         * sampler channel can individually be deployed with it's own sampler
232         * engine, connected to an arbitrary MIDI input device and connected to
233         * an arbitrary audio output device. Here an example setup:
234         * @code
235         * S.Channel    MIDI in    S.Engine         Audio out
236         * -------------------------------------------------------------------
237         *   0          Alsa   ->  gig::Engine  ->  Jack
238         *   1          VSTi   ->  Akai::Engine ->  VSTi
239         *   2          Jack   ->  DLS::Engine  ->  Jack
240         *   3          Jack   ->  SF::Engine   ->  Alsa
241         *
242         * ... (and so on) ...
243         * @endcode
244         *
245         * Note that not all audio and MIDI backends and sampler engines listed
246         * in the example above might already been implemented!
247         *
248         * As you can see in the example setup, LinuxSampler is capable to use
249         * several, different audio output and MIDI input systems
250         * simultaniously at the same time. Here the example setup shown in the
251         * aspect of MIDI input and audio output devices / drivers:
252         * @code
253         *                      ######################### #########################
254         *                      # AudioOutputDeviceJack # # AudioOutputDeviceVSTi #
255         *                      ######################### #########################
256         *                                        ^   ^           ^
257         *  /------------>|Sampler Channel 0|-----/   |           |
258         *  |  /--------->|Sampler Channel 1|---------------------/
259         *  |  |  /------>|Sampler Channel 2|---------/
260         *  |  |  |  /--->|Sampler Channel 3|------------>#########################
261         *  |  |  |  |    ... (and so on) ...             # AudioOutputDeviceAlsa #
262         *  |  |  |  |                                    #########################
263         *  |  |  |  \-----------------------------------------------------\
264         *  |  |  \--------------------------------------------\           |
265         *  |  \--------------------\                          |           |
266         *  |                       |                          |           |
267         * ####################### ####################### #######################
268         * # MidiInputDeviceAlsa # # MidiInputDeviceVSTi # # MidiInputDeviceJack #
269         * ####################### ####################### #######################
270         * @endcode
271         *
272         * As you can see in this example setup, one device (that is midi input
273         * driver / audio output driver) can be connected multiple times to
274         * different sampler channels.
275         *
276         * It's even possible to create multiple instances of the same driver, for
277         * example multiple instances of the Alsa output driver to use multiple
278         * sound cards at the same time, or multiple instances of the JACK audio
279         * output driver to leverage SMP systems or boxes with several hard discs.
280         */
281      class Sampler {      class Sampler {
282          public:          public:
283                /**
284                 * Constructor. Create a LinuxSampler instance.
285                 */
286              Sampler();              Sampler();
            ~Sampler();  
             uint               SamplerChannels();  
             SamplerChannel*    AddSamplerChannel();  
             SamplerChannel*    GetSamplerChannel(uint uiSamplerChannel);  
             void               RemoveSamplerChannel(SamplerChannel* pSamplerChannel);  
             void               RemoveSamplerChannel(uint uiSamplerChannel);  
             AudioOutputDevice* CreateAudioOutputDevice(audio_output_type_t AudioType);  
             AudioOutputDevice* GetAudioOutputDevice(audio_output_type_t AudioType);  
             MidiInputDevice*   CreateMidiInputDevice(midi_input_type_t MidiType);  
             MidiInputDevice*   GetMidiInputDevice(midi_input_type_t MidiType);  
         protected:  
             typedef std::map<audio_output_type_t, AudioOutputDevice*> AudioOutputDeviceMap;  
             typedef std::map<midi_input_type_t, MidiInputDevice*> MidiInputDeviceMap;  
287    
288              std::vector<SamplerChannel*> vSamplerChannels;   ///< contains all created sampler channels              /**
289              AudioOutputDeviceMap         AudioOutputDevices; ///< contains all created audio output devices               * Destructor.
290              MidiInputDeviceMap           MidiInputDevices;               */
291                virtual ~Sampler();
292    
293                /**
294                 * Returns the number of sampler channels currently allocated.
295                 */
296                uint SamplerChannels();
297    
298                /**
299                 * Create and add a new sampler channel to this Sampler
300                 * instance. For race condition reasons the new channel will use
301                 * an index past the last already existing sampler channel
302                 * index (in case the index limit was not reached yet, otherwise
303                 * a free index starting from 0 is searched).
304                 *
305                 * @returns  pointer to new sampler channel
306                 */
307                SamplerChannel* AddSamplerChannel();
308    
309                /**
310                 * Returns the sampler channel of the given sampler channel
311                 * index.
312                 *
313                 * @returns  pointer to sought sampler channel
314                 */
315                SamplerChannel* GetSamplerChannel(uint uiSamplerChannel);
316    
317                /**
318                 * Returns all created sampler channels.
319                 */
320                std::map<uint, SamplerChannel*> GetSamplerChannels();
321    
322                /**
323                 * Destroy and remove the given sampler channel from this
324                 * Sampler instance.
325                 *
326                 * @param pSamplerChannel - pointer to sampler channel to remove
327                 */
328                void RemoveSamplerChannel(SamplerChannel* pSamplerChannel);
329    
330                /**
331                 * Destroy and remove the given sampler channel from this
332                 * Sampler instance.
333                 *
334                 * @param uiSamplerChannel - index of the sampler channel to
335                 *                           remove
336                 */
337                void RemoveSamplerChannel(uint uiSamplerChannel);
338    
339                /**
340                 * Destroy and remove all sampler channels from this
341                 * Sampler instance.
342                 */
343                void RemoveAllSamplerChannels();
344    
345                /**
346                 * Returns the names of all available audio output drivers.
347                 */
348                std::vector<String> AvailableAudioOutputDrivers();
349    
350                /**
351                 * Returns the names of all available MIDI input drivers.
352                 */
353                std::vector<String> AvailableMidiInputDrivers();
354    
355                /**
356                 * Returns the names of all available sampler engine types.
357                 * @see SamplerChannel::SetEngineType()
358                 */
359                std::vector<String> AvailableEngineTypes();
360    
361                /**
362                 * Create an audio output device.
363                 *
364                 * @param AudioDriver - name of the audio driver
365                 * @param Parameters - eventually needed driver parameters to
366                 *                     create the device
367                 * @returns  pointer to created audio output device
368                 * @throws Exception  if device could not be created
369                 */
370                AudioOutputDevice* CreateAudioOutputDevice(String AudioDriver, std::map<String,String> Parameters) throw (Exception);
371    
372                /**
373                 * Create a midi input device.
374                 *
375                 * @param MidiDriver - name of the midi driver
376                 * @param Parameters - eventually needed driver parameters to
377                 *                     create the device
378                 * @returns  pointer to created midi input device
379                 * @throws Exception  if device could not be created
380                 */
381                MidiInputDevice* CreateMidiInputDevice(String MidiDriver, std::map<String,String> Parameters) throw (Exception);
382    
383                /**
384                 * Returns the number of all created audio output devices.
385                 */
386                uint AudioOutputDevices();
387    
388                /**
389                 * Returns the number of all created MIDI input devices.
390                 */
391                uint MidiInputDevices();
392    
393                /**
394                 * Returns all created audio output devices.
395                 */
396                std::map<uint, AudioOutputDevice*> GetAudioOutputDevices();
397    
398                /**
399                 * Returns all created MIDI input devices.
400                 */
401                std::map<uint, MidiInputDevice*> GetMidiInputDevices();
402    
403                /**
404                 * Destroy the given audio output device and takes care if there
405                 * are still sampler engines connected to this device, etc.
406                 *
407                 * @throws Exception  if sampler channels are still
408                 *                    connected to the device
409                 */
410                void DestroyAudioOutputDevice(AudioOutputDevice* pDevice) throw (Exception);
411    
412                /**
413                 * Destroy all audio output devices and takes care if there
414                 * are still sampler engines connected to devices, etc.
415                 *
416                 * Note: non-autonomous devices, that is devices associated with
417                 * host plugin instances like VST, AU, DSSI, LV2 are not
418                 * destroyed by this method.
419                 *
420                 * @throws Exception  if sampler channels are still
421                 *                    connected to device
422                 */
423                void DestroyAllAudioOutputDevices() throw (Exception);
424    
425                /**
426                 * Destroy the given MIDI input device and takes care if there
427                 * are still sampler engines connected to this device, etc.
428                 *
429                 * @throws Exception  if sampler channels are still
430                 *                    connected to the device
431                 */
432                void DestroyMidiInputDevice(MidiInputDevice* pDevice) throw (Exception);
433    
434                /**
435                 * Destroy all MIDI input devices and take care if there
436                 * are still sampler engines connected to device, etc.
437                 *
438                 * Note: non-autonomous devices, that is devices associated with
439                 * host plugin instances like VST, AU, DSSI, LV2 are not
440                 * destroyed by this method.
441                 *
442                 * @throws Exception  if sampler channels are still
443                 *                    connected to device
444                 */
445                void DestroyAllMidiInputDevices() throw (Exception);
446    
447                 /**
448                 * Gets the current number of all active streams.
449                 * @returns The current number of all active streams.
450                 */
451                int GetDiskStreamCount();
452    
453                /**
454                 * Gets the current number of all active voices.
455                 * @returns The current number of all active voices.
456                 */
457                int GetVoiceCount();
458    
459                /**
460                 * @see SetGlobalMaxVoices()
461                 */
462                int GetGlobalMaxVoices();
463    
464                /**
465                 * @see SetGlobalMaxStreams()
466                 */
467                int GetGlobalMaxStreams();
468    
469                /**
470                 * Sets the global maximum amount limit of voices.
471                 *
472                 * Note that this voice limit can also be altered for
473                 * each sampler engine instance individually instead.
474                 *
475                 * @throws Exception  if \a n is invalid
476                 */
477                void SetGlobalMaxVoices(int n) throw (Exception);
478    
479                /**
480                 * Sets the global maximum amount limit of disk streams.
481                 *
482                 * Note that this stream limit can also be altered for
483                 * each sampler engine instance individually instead.
484                             *
485                 * @throws Exception  if \a n is invalid
486                 */
487                void SetGlobalMaxStreams(int n) throw (Exception);
488    
489                /**
490                 * Reset the whole sampler. Destroy all engines, sampler
491                 * channels, MIDI input devices and audio output devices.
492                 */
493                void Reset();
494    
495                ///////////////////////////////////////////////////////////////
496                // Event Listener methods
497    
498                /**
499                 * Registers the specified listener to be notified
500                 * when the number of sampler chanels is changed.
501                 */
502                void AddChannelCountListener(ChannelCountListener* l);
503    
504                /**
505                 * Removes the specified listener.
506                 */
507                void RemoveChannelCountListener(ChannelCountListener* l);
508    
509                /**
510                 * Registers the specified listener to be notified
511                 * when the number of audio output devices is changed.
512                 */
513                void AddAudioDeviceCountListener(AudioDeviceCountListener* l);
514    
515                /**
516                 * Removes the specified listener.
517                 */
518                void RemoveAudioDeviceCountListener(AudioDeviceCountListener* l);
519    
520                /**
521                 * Registers the specified listener to be notified
522                 * when the number of MIDI input devices is changed.
523                 */
524                void AddMidiDeviceCountListener(MidiDeviceCountListener* l);
525    
526                /**
527                 * Removes the specified listener.
528                 */
529                void RemoveMidiDeviceCountListener(MidiDeviceCountListener* l);
530    
531                /**
532                 * Registers the specified listener to be notified when the number
533                 * of active voices in a particular sampler channel is changed.
534                 */
535                void AddVoiceCountListener(VoiceCountListener* l);
536    
537                /**
538                 * Removes the specified listener.
539                 */
540                void RemoveVoiceCountListener(VoiceCountListener* l);
541    
542                /**
543                 * Notifies listeners that the number of active voices
544                 * on the specified sampler channel is changed.
545                 * @param ChannelId The numerical ID of the sampler channel.
546                 * @param NewCount The new number of active voices.
547                 */
548                void fireVoiceCountChanged(int ChannelId, int NewCount);
549    
550                /**
551                 * Registers the specified listener to be notified when the number
552                 * of active disk streams in a particular sampler channel is changed.
553                 */
554                void AddStreamCountListener(StreamCountListener* l);
555    
556                /**
557                 * Removes the specified listener.
558                 */
559                void RemoveStreamCountListener(StreamCountListener* l);
560    
561                /**
562                 * Notifies listeners that the number of active disk streams
563                 * on the specified sampler channel is changed.
564                 * @param ChannelId The numerical ID of the sampler channel.
565                 * @param NewCount The new number of active disk streams.
566                 */
567                void fireStreamCountChanged(int ChannelId, int NewCount);
568    
569                /**
570                 * Registers the specified listener to be
571                 * notified when the fill state of the disk stream
572                 * buffers on a specific sampler channel is changed.
573                 */
574                void AddBufferFillListener(BufferFillListener* l);
575    
576                /**
577                 * Removes the specified listener.
578                 */
579                void RemoveBufferFillListener(BufferFillListener* l);
580    
581                /**
582                 * Notifies listeners that the fill state of the disk stream
583                 * buffers on the specified sampler channel is changed.
584                 * @param ChannelId The numerical ID of the sampler channel.
585                 * @param FillData The buffer fill data for the specified sampler channel.
586                 */
587                void fireBufferFillChanged(int ChannelId, String FillData);
588    
589                /**
590                 * Registers the specified listener to be notified
591                 * when total number of active voices is changed.
592                 */
593                void AddTotalVoiceCountListener(TotalVoiceCountListener* l);
594    
595                /**
596                 * Removes the specified listener.
597                 */
598                void RemoveTotalVoiceCountListener(TotalVoiceCountListener* l);
599    
600                /**
601                 * Notifies listeners that the total number of active voices is changed.
602                 * @param NewCount The new number of active voices.
603                 */
604                void fireTotalVoiceCountChanged(int NewCount);
605    
606                /**
607                 * Registers the specified listener to be notified when the number
608                 * of total streams is changed.
609                 */
610                void AddTotalStreamCountListener(TotalStreamCountListener* l);
611    
612                /**
613                 * Removes the specified listener.
614                 */
615                void RemoveTotalStreamCountListener(TotalStreamCountListener* l);
616    
617                /**
618                 * Notifies listeners that the total number of total streams changed.
619                 * @param NewCount The new number of total streams.
620                 */
621                void fireTotalStreamCountChanged(int NewCount);
622    
623                /**
624                 * Registers the specified listener to be notified when the number
625                 * of effect sends on a particular sampler channel is changed.
626                 */
627                void AddFxSendCountListener(FxSendCountListener* l);
628    
629                /**
630                 * Removes the specified listener.
631                 */
632                void RemoveFxSendCountListener(FxSendCountListener* l);
633    
634                /**
635                 * Notifies listeners about the current number of voices,
636                 * streams and total voices, and the current fill state of
637                 * the disk stream buffers.
638                 */
639                void fireStatistics();
640    
641                ///////////////////////////////////////////////////////////////
642                // system specific methods
643    
644                /**
645                 * Advise the FPU to treat denormal floating point numbers as
646                 * zero, to avoid severe performance penalty when dealing with
647                 * such extreme floating point values.
648                 *
649                 * @returns @c true if FPU supports it, @c false otherwise
650                 */
651                static bool EnableDenormalsAreZeroMode();
652    
653    #if defined(WIN32)
654                /**
655                 * Gets the directory where the liblinuxsampler dll is located.
656                 * Note: this method is currently only available for Windows.
657                 * @returns installation directory
658                 */
659                static String GetInstallDir();
660    #endif
661            protected:
662                /**
663                 * Notifies listeners that the number of sampler channels has been changed.
664                 * @param NewCount The new number of sampler channels.
665                 */
666                void fireChannelCountChanged(int NewCount);
667    
668                /**
669                 * Notifies listeners that the specified sampler channel has just
670                 * been added.
671                 * @param pChannel The new sampler channel.
672                 */
673                void fireChannelAdded(SamplerChannel* pChannel);
674    
675                /**
676                 * Notifies listeners that the specified sampler channel is
677                 * going to be removed soon.
678                 * @param pChannel sampler channel to be removed.
679                 */
680                void fireChannelToBeRemoved(SamplerChannel* pChannel);
681    
682                /**
683                 * Notifies listeners that the number of audio output devices has been changed.
684                 * @param NewCount The new number of audio output devices.
685                 */
686                void fireAudioDeviceCountChanged(int NewCount);
687    
688                /**
689                 * Notifies listeners that the number of MIDI input devices has been changed.
690                 * @param NewCount The new number of MIDI input devices.
691                 */
692                void fireMidiDeviceCountChanged(int NewCount);
693    
694                /**
695                 * Notifies listeners that the supplied MIDI input device is
696                 * going to be destroyed soon.
697                 * @param pDevice MIDI input device to be destroyed
698                 */
699                void fireMidiDeviceToBeDestroyed(MidiInputDevice* pDevice);
700    
701                /**
702                 * Notifies listeners that the supplied MIDI input device was
703                 * just created.
704                 * @param pDevice new MIDI input device
705                 */
706                void fireMidiDeviceCreated(MidiInputDevice* pDevice);
707    
708                /**
709                 * Notifies listeners that the number of effect sends
710                 * on a particular sampler channel is changed.
711                 * @param ChannelId The numerical ID of the sampler channel.
712                 * @param NewCount The new number of sampler channels.
713                 */
714                void fireFxSendCountChanged(int ChannelId, int NewCount);
715    
716                typedef std::map<uint, SamplerChannel*> SamplerChannelMap;
717    
718                SamplerChannelMap mSamplerChannels; ///< contains all created sampler channels
719    
720                // statistics cache
721                uint uiOldTotalVoiceCount;
722                uint uiOldTotalStreamCount;
723                std::map<uint, uint> mOldVoiceCounts;
724                std::map<uint, uint> mOldStreamCounts;
725    
726              friend class SamplerChannel;              friend class SamplerChannel;
727    
728            private:
729                ListenerList<ChannelCountListener*> llChannelCountListeners;
730                ListenerList<AudioDeviceCountListener*> llAudioDeviceCountListeners;
731                ListenerList<MidiDeviceCountListener*> llMidiDeviceCountListeners;
732                ListenerList<VoiceCountListener*> llVoiceCountListeners;
733                ListenerList<StreamCountListener*> llStreamCountListeners;
734                ListenerList<BufferFillListener*> llBufferFillListeners;
735                ListenerList<TotalStreamCountListener*> llTotalStreamCountListeners;
736                ListenerList<TotalVoiceCountListener*> llTotalVoiceCountListeners;
737                ListenerList<FxSendCountListener*> llFxSendCountListeners;
738    
739                class EventHandler : public EngineChangeListener, public FxSendCountListener {
740                    public:
741                        void SetSampler(Sampler* pSampler) { this->pSampler = pSampler; }
742    
743                        /**
744                         * Invoked when the engine type of the specified sampler
745                         * channel is going to be changed soon.
746                         * @param ChannelId The numerical ID of the sampler channel
747                         */
748                        virtual void EngineToBeChanged(int ChannelId);
749    
750                        /**
751                         * Invoked when the engine type of the
752                         * specified sampler channel is changed.
753                         * @param ChannelId The numerical ID of the sampler
754                         * channel, which engine type has been changed.
755                         */
756                        virtual void EngineChanged(int ChannelId);
757    
758                        /**
759                         * Invoked when the number of effect sends
760                         * on the specified sampler channel has changed.
761                         * @param ChannelId The numerical ID of the sampler channel.
762                         * @param NewCount The new number of effect sends.
763                         */
764                        virtual void FxSendCountChanged(int ChannelId, int NewCount);
765    
766                    private:
767                        Sampler* pSampler;
768                } eventHandler;
769      };      };
770  }  }
771    
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