src/engines/EngineChannel.h

/***************************************************************************
 *                                                                         *
 *   Copyright (C) 2005 - 2012 Christian Schoenebeck                       *
 *                                                                         *
 *   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_ENGINECHANNEL_H__
#define __LS_ENGINECHANNEL_H__

#include "../EventListeners.h"
#include "../drivers/audio/AudioOutputDevice.h"
#include "../drivers/midi/midi.h"
#include "../drivers/midi/MidiInputDevice.h"
#include "../drivers/midi/MidiInputPort.h"
#include "../drivers/midi/VirtualMidiDevice.h"
#include "Engine.h"
#include "FxSend.h"

namespace LinuxSampler {

    // just symbol prototyping
    class Sampler;
    class SamplerChannel;
    class AudioOutputDevice;
    class MidiInputPort;
    class FxSend;


    /** @brief Channel Interface for LinuxSampler Sampler Engines
     *
     * Every sampler engine can be used on several sampler channels and
     * usually the same Engine instance is used on multiple sampler
     * channels. For this every sampler engine must also implement a class
     * which handles all channel dependant parameters and channel
     * dependant execution code.
     *
     * This abstract base interface class defines all mandatory methods
     * which have to be implemented by all engine channel implementations.
     */
    class EngineChannel {
        public:

            /////////////////////////////////////////////////////////////////
            // abstract methods
            //     (these have to be implemented by the descendant)

            virtual void    PrepareLoadInstrument(const char* FileName, uint Instrument) = 0;
            virtual void    LoadInstrument() = 0;
            virtual void    Reset() = 0;
            virtual void    SendNoteOn(uint8_t Key, uint8_t Velocity, uint8_t MidiChannel) = 0;
            virtual void    SendNoteOn(uint8_t Key, uint8_t Velocity, uint8_t MidiChannel, int32_t FragmentPos) = 0;
            virtual void    SendNoteOff(uint8_t Key, uint8_t Velocity, uint8_t MidiChannel) = 0;
            virtual void    SendNoteOff(uint8_t Key, uint8_t Velocity, uint8_t MidiChannel, int32_t FragmentPos) = 0;
            virtual void    SendPitchbend(int Pitch, uint8_t MidiChannel) = 0;
            virtual void    SendPitchbend(int Pitch, uint8_t MidiChannel, int32_t FragmentPos) = 0;
            virtual void    SendControlChange(uint8_t Controller, uint8_t Value, uint8_t MidiChannel) = 0;
            virtual void    SendControlChange(uint8_t Controller, uint8_t Value, uint8_t MidiChannel, int32_t FragmentPos) = 0;
            virtual void    SendProgramChange(uint8_t Program) = 0;
            virtual bool    StatusChanged(bool bNewStatus = false) = 0;
            virtual float   Volume() = 0;
            virtual void    Volume(float f) = 0;
            virtual float   Pan() = 0;
            virtual void    Pan(float f) = 0;
            virtual uint    Channels() = 0;
            virtual void    Connect(AudioOutputDevice* pAudioOut) = 0;
            virtual void    DisconnectAudioOutputDevice() = 0;
            virtual AudioOutputDevice* GetAudioOutputDevice() = 0;
            virtual void    SetOutputChannel(uint EngineAudioChannel, uint AudioDeviceChannel) = 0;
            virtual int     OutputChannel(uint EngineAudioChannel) = 0;
            virtual void    Connect(MidiInputPort* pMidiPort, midi_chan_t MidiChannel) = 0;
            virtual void    DisconnectMidiInputPort() = 0;
            virtual MidiInputPort* GetMidiInputPort() = 0;
            virtual midi_chan_t MidiChannel() = 0;
            virtual String  InstrumentFileName() = 0;
            virtual String  InstrumentName() = 0;
            virtual int     InstrumentIndex() = 0;
            virtual int     InstrumentStatus() = 0;
            virtual Engine* GetEngine() = 0;
            virtual String  EngineName() = 0;
            virtual FxSend* AddFxSend(uint8_t MidiCtrl, String Name = "") throw (Exception) = 0;
            virtual FxSend* GetFxSend(uint FxSendIndex) = 0;
            virtual uint    GetFxSendCount() = 0;
            virtual void    RemoveFxSend(FxSend* pFxSend) = 0;
            virtual void    Connect(VirtualMidiDevice* pDevice) = 0;
            virtual void    Disconnect(VirtualMidiDevice* pDevice) = 0;


            /////////////////////////////////////////////////////////////////
            // normal methods
            //     (usually not to be overridden by descendant)

            /**
             * Sets the mute state of this channel.
             *
             * @param state - specifies the mute state of this sampler channel.
             * @throws Exception - if state does not contain valid
             * value.
             */
            void SetMute(int state) throw (Exception);

            /**
             * Determines whether this channel is muted.
             *
             * @returns 1 if the channel is muted, 0 if the channel is not muted
             * and -1 if the channel is muted because of presence of at least
             * one solo channel.
             */
            int GetMute();

            /**
             * Sets the solo state of this channel.
             *
             * @param solo - specifies whether this is a solo channel.
             */
            void SetSolo(bool solo);

            /**
             * Determines whether this is a solo channel.
             *
             * @returns true if this is a solo channel, false otherwise.
             */
            bool GetSolo();

            /**
             * Returns current MIDI program (change) number of this
             * EngineChannel.
             */
            uint8_t GetMidiProgram();

            /**
             * Change EngineChannel's MIDI program.
             */
            void SetMidiProgram(uint8_t Program);

            /**
             * Returns current MIDI bank MSB (coarse) number of this
             * EngineChannel.
             */
            uint8_t GetMidiBankMsb();

            /**
             * Change current MIDI bank MSB (coarse) number of this
             * EngineChannel.
             */
            void SetMidiBankMsb(uint8_t BankMSB);

            /**
             * Returns current MIDI bank LSB (fine) number of this
             * EngineChannel.
             */
            uint8_t GetMidiBankLsb();

            /**
             * Change current MIDI bank LSB (fine) number of this
             * EngineChannel.
             */
            void SetMidiBankLsb(uint8_t BankLSB);

            /**
             * Returns true if this EngineChannel is using no MIDI
             * instrument map at all, that is if it will ignore all MIDI
             * program change messages.
             *
             * @see UsesDefaultMidiInstrumentMap()
             * @see GetMidiInstrumentMap()
             */
            bool UsesNoMidiInstrumentMap();

            /**
             * Returns true if this EngineChannel is using the default MIDI
             * instrument map for handling MIDI program changes.
             *
             * @see UsesNoMidiInstrumentMap()
             * @see GetMidiInstrumentMap()
             */
            bool UsesDefaultMidiInstrumentMap();

            /**
             * Returns ID of the MIDI instrument map currently used by this
             * EngineChannel to handle MIDI program changes. You should
             * always call @c UsesNoMidiInstrumentMap() and
             * @c UsesDefaultMidiInstrumentMap() before calling this method
             * to check if this EngineChannel is probably using the default
             * map or no map at all, because in these two particular cases
             * this method would throw an exception!
             *
             * @throws Exception - if EngineChannel is set to no map at all
             *                     or is set to the default map
             * @see UsesNoMidiInstrumentMap()
             * @see UsesDefaultMidiInstrumentMap()
             */
            int GetMidiInstrumentMap() throw (Exception);

            /**
             * Let this EngineChannel use no MIDI instrument map at all,
             * that is to let it ignore all MIDI program change messages.
             *
             * @see SetMidiInstrumentMapToDefault()
             * @see SetMidiInstrumentMap()
             */
            void SetMidiInstrumentMapToNone();

            /**
             * Let this EngineChannel use the default MIDI instrument map to
             * handle MIDI program changes.
             *
             * @see SetMidiInstrumentMapToNone()
             * @see SetMidiInstrumentMap()
             */
            void SetMidiInstrumentMapToDefault();

            /**
             * Set a specific MIDI instrument map this EngineChannel should
             * use to handle MIDI program changes.
             *
             * @see SetMidiInstrumentMapToNone()
             * @see SetMidiInstrumentMapToDefault()
             *
             * @throws Exception - in case given map does not exist
             */
            void SetMidiInstrumentMap(int MidiMap) throw (Exception);

            /**
             * Set MIDI Registered Parameter Number (RPN) Controller
             * (upper 8 bits / coarse).
             */
            void SetMidiRpnControllerMsb(uint8_t CtrlMSB);

            /**
             * Set MIDI Registered Parameter Number (RPN) Controller
             * (lower 8 bits / fine).
             */
            void SetMidiRpnControllerLsb(uint8_t CtrlLSB);

            /**
             * Reset to no RPN controller currently selected.
             */
            void ResetMidiRpnController();

            /**
             * Set MIDI Non-Registered Parameter Number (NRPN) Controller
             * (upper 8 bits / coarse).
             */
            void SetMidiNrpnControllerMsb(uint8_t CtrlMSB);

            /**
             * Set MIDI Non-Registered Parameter Number (NRPN) Controller
             * (lower 8 bits / fine).
             */
            void SetMidiNrpnControllerLsb(uint8_t CtrlLSB);

            /**
             * Reset to no NRPN controller currently selected.
             */
            void ResetMidiNrpnController();

             /**
             * Registers the specified listener to be notified when the number
             * of effect sends on this channel is changed.
             */
            void AddFxSendCountListener(FxSendCountListener* l);

            /**
             * Removes the specified listener.
             */
            void RemoveFxSendCountListener(FxSendCountListener* l);

            /**
             * Removes all listeners.
             */
            void RemoveAllFxSendCountListeners();

            /**
             * Get currently selected MIDI Registered Parameter Number
             * (RPN) Controller, this method will return the already merged
             * value (MSB and LSB value).
             *
             * @e WARNING: you have to call @c ResetMidiRpnController()
             * after using this value, otherwise all subsequent MIDI CC #6
             * (Data) messages are interpreted as RPN controller value
             * messages.
             *
             * @returns currently selected RPN controller number, a negative
             *          value if no RPN controller currently selected
             */
            int GetMidiRpnController();

            /**
             * Get currently selected MIDI Non-Registered Parameter Number
             * (NRPN) Controller, this method will return the already merged
             * value (MSB and LSB value).
             *
             * @e WARNING: you have to call @c ResetMidiNrpnController()
             * after using this value, otherwise all subsequent MIDI CC #6
             * (Data) messages are interpreted as NRPN controller value
             * messages.
             *
             * @returns currently selected NRPN controller number, a negative
             *          value if no NRPN controller currently selected
             */
            int GetMidiNrpnController();

            /**
             * Gets the current number of active voices.
             */
            uint GetVoiceCount();

            /**
             * Sets the current number of active voices.
             */
            void SetVoiceCount(uint Voices);

            /**
             * Gets the current number of active disk streams.
             */
            uint GetDiskStreamCount();

            /**
             * Sets the current number of active disk streams.
             */
            void SetDiskStreamCount(uint Streams);

            SamplerChannel* GetSamplerChannel();

            void SetSamplerChannel(SamplerChannel* pChannel);

            /** Returns the sampler to which this channel belongs */
            Sampler* GetSampler();

            /**
             * Performs a program change on the channel.
             *
             * This method is not real-time safe.
             */
            void ExecuteProgramChange(uint32_t Program);

        protected:
            EngineChannel();
            virtual ~EngineChannel(); // MUST only be destroyed by EngineChannelFactory

            /**
             * Notifies listeners that the number of effect sends
             * on a this channel is changed.
             * @param ChannelId The numerical ID of the sampler channel.
             * @param NewCount The new number of sampler channels.
             */
            void fireFxSendCountChanged(int ChannelId, int NewCount);

            friend class EngineChannelFactory;

        private:
            struct private_data_t;
            private_data_t* const p;
    };

} // namespace LinuxSampler

#endif // __LS_ENGINECHANNEL_H__
1	schoenebeck	889	/***************************************************************************
2			* *
3	persson	2317	* Copyright (C) 2005 - 2012 Christian Schoenebeck *
4	schoenebeck	889	* *
5			* This program is free software; you can redistribute it and/or modify *
6			* it under the terms of the GNU General Public License as published by *
7			* the Free Software Foundation; either version 2 of the License, or *
8			* (at your option) any later version. *
9			* *
10			* This program is distributed in the hope that it will be useful, *
11			* but WITHOUT ANY WARRANTY; without even the implied warranty of *
12			* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
13			* GNU General Public License for more details. *
14			* *
15			* You should have received a copy of the GNU General Public License *
16			* along with this program; if not, write to the Free Software *
17			* Foundation, Inc., 59 Temple Place, Suite 330, Boston, *
18			* MA 02111-1307 USA *
19			***************************************************************************/
20
21			#ifndef __LS_ENGINECHANNEL_H__
22			#define __LS_ENGINECHANNEL_H__
23
24	iliev	1130	#include "../EventListeners.h"
25	schoenebeck	889	#include "../drivers/audio/AudioOutputDevice.h"
26			#include "../drivers/midi/midi.h"
27			#include "../drivers/midi/MidiInputDevice.h"
28			#include "../drivers/midi/MidiInputPort.h"
29	schoenebeck	1686	#include "../drivers/midi/VirtualMidiDevice.h"
30	schoenebeck	889	#include "Engine.h"
31	schoenebeck	1001	#include "FxSend.h"
32	schoenebeck	889
33			namespace LinuxSampler {
34
35			// just symbol prototyping
36	iliev	1761	class Sampler;
37			class SamplerChannel;
38	schoenebeck	889	class AudioOutputDevice;
39			class MidiInputPort;
40	schoenebeck	1001	class FxSend;
41	schoenebeck	889
42	schoenebeck	1001
43	schoenebeck	889	/** @brief Channel Interface for LinuxSampler Sampler Engines
44			*
45			* Every sampler engine can be used on several sampler channels and
46			* usually the same Engine instance is used on multiple sampler
47			* channels. For this every sampler engine must also implement a class
48			* which handles all channel dependant parameters and channel
49			* dependant execution code.
50			*
51			* This abstract base interface class defines all mandatory methods
52			* which have to be implemented by all engine channel implementations.
53			*/
54			class EngineChannel {
55			public:
56
57			/////////////////////////////////////////////////////////////////
58			// abstract methods
59			// (these have to be implemented by the descendant)
60
61			virtual void PrepareLoadInstrument(const char* FileName, uint Instrument) = 0;
62			virtual void LoadInstrument() = 0;
63			virtual void Reset() = 0;
64	persson	2317	virtual void SendNoteOn(uint8_t Key, uint8_t Velocity, uint8_t MidiChannel) = 0;
65			virtual void SendNoteOn(uint8_t Key, uint8_t Velocity, uint8_t MidiChannel, int32_t FragmentPos) = 0;
66			virtual void SendNoteOff(uint8_t Key, uint8_t Velocity, uint8_t MidiChannel) = 0;
67			virtual void SendNoteOff(uint8_t Key, uint8_t Velocity, uint8_t MidiChannel, int32_t FragmentPos) = 0;
68			virtual void SendPitchbend(int Pitch, uint8_t MidiChannel) = 0;
69			virtual void SendPitchbend(int Pitch, uint8_t MidiChannel, int32_t FragmentPos) = 0;
70			virtual void SendControlChange(uint8_t Controller, uint8_t Value, uint8_t MidiChannel) = 0;
71			virtual void SendControlChange(uint8_t Controller, uint8_t Value, uint8_t MidiChannel, int32_t FragmentPos) = 0;
72	persson	1924	virtual void SendProgramChange(uint8_t Program) = 0;
73	schoenebeck	889	virtual bool StatusChanged(bool bNewStatus = false) = 0;
74			virtual float Volume() = 0;
75			virtual void Volume(float f) = 0;
76	schoenebeck	1723	virtual float Pan() = 0;
77			virtual void Pan(float f) = 0;
78	schoenebeck	889	virtual uint Channels() = 0;
79			virtual void Connect(AudioOutputDevice* pAudioOut) = 0;
80			virtual void DisconnectAudioOutputDevice() = 0;
81	schoenebeck	1001	virtual AudioOutputDevice* GetAudioOutputDevice() = 0;
82	schoenebeck	889	virtual void SetOutputChannel(uint EngineAudioChannel, uint AudioDeviceChannel) = 0;
83			virtual int OutputChannel(uint EngineAudioChannel) = 0;
84			virtual void Connect(MidiInputPort* pMidiPort, midi_chan_t MidiChannel) = 0;
85			virtual void DisconnectMidiInputPort() = 0;
86			virtual MidiInputPort* GetMidiInputPort() = 0;
87			virtual midi_chan_t MidiChannel() = 0;
88			virtual String InstrumentFileName() = 0;
89			virtual String InstrumentName() = 0;
90			virtual int InstrumentIndex() = 0;
91			virtual int InstrumentStatus() = 0;
92			virtual Engine* GetEngine() = 0;
93			virtual String EngineName() = 0;
94	schoenebeck	1001	virtual FxSend* AddFxSend(uint8_t MidiCtrl, String Name = "") throw (Exception) = 0;
95			virtual FxSend* GetFxSend(uint FxSendIndex) = 0;
96			virtual uint GetFxSendCount() = 0;
97			virtual void RemoveFxSend(FxSend* pFxSend) = 0;
98	schoenebeck	1686	virtual void Connect(VirtualMidiDevice* pDevice) = 0;
99			virtual void Disconnect(VirtualMidiDevice* pDevice) = 0;
100	schoenebeck	889
101	schoenebeck	1001
102			/////////////////////////////////////////////////////////////////
103			// normal methods
104			// (usually not to be overridden by descendant)
105
106	schoenebeck	889	/**
107			* Sets the mute state of this channel.
108			*
109			* @param state - specifies the mute state of this sampler channel.
110			* @throws Exception - if state does not contain valid
111			* value.
112			*/
113			void SetMute(int state) throw (Exception);
114
115			/**
116			* Determines whether this channel is muted.
117			*
118			* @returns 1 if the channel is muted, 0 if the channel is not muted
119			* and -1 if the channel is muted because of presence of at least
120			* one solo channel.
121			*/
122			int GetMute();
123
124			/**
125			* Sets the solo state of this channel.
126			*
127			* @param solo - specifies whether this is a solo channel.
128			*/
129			void SetSolo(bool solo);
130
131			/**
132			* Determines whether this is a solo channel.
133			*
134			* @returns true if this is a solo channel, false otherwise.
135			*/
136			bool GetSolo();
137
138	schoenebeck	947	/**
139			* Returns current MIDI program (change) number of this
140			* EngineChannel.
141			*/
142			uint8_t GetMidiProgram();
143
144			/**
145			* Change EngineChannel's MIDI program.
146			*/
147			void SetMidiProgram(uint8_t Program);
148
149			/**
150			* Returns current MIDI bank MSB (coarse) number of this
151			* EngineChannel.
152			*/
153			uint8_t GetMidiBankMsb();
154
155			/**
156			* Change current MIDI bank MSB (coarse) number of this
157			* EngineChannel.
158			*/
159			void SetMidiBankMsb(uint8_t BankMSB);
160
161			/**
162			* Returns current MIDI bank LSB (fine) number of this
163			* EngineChannel.
164			*/
165			uint8_t GetMidiBankLsb();
166
167			/**
168			* Change current MIDI bank LSB (fine) number of this
169			* EngineChannel.
170			*/
171			void SetMidiBankLsb(uint8_t BankLSB);
172
173	schoenebeck	973	/**
174			* Returns true if this EngineChannel is using no MIDI
175			* instrument map at all, that is if it will ignore all MIDI
176			* program change messages.
177			*
178			* @see UsesDefaultMidiInstrumentMap()
179			* @see GetMidiInstrumentMap()
180			*/
181			bool UsesNoMidiInstrumentMap();
182
183			/**
184			* Returns true if this EngineChannel is using the default MIDI
185			* instrument map for handling MIDI program changes.
186			*
187			* @see UsesNoMidiInstrumentMap()
188			* @see GetMidiInstrumentMap()
189			*/
190			bool UsesDefaultMidiInstrumentMap();
191
192			/**
193			* Returns ID of the MIDI instrument map currently used by this
194			* EngineChannel to handle MIDI program changes. You should
195			* always call @c UsesNoMidiInstrumentMap() and
196			* @c UsesDefaultMidiInstrumentMap() before calling this method
197			* to check if this EngineChannel is probably using the default
198			* map or no map at all, because in these two particular cases
199			* this method would throw an exception!
200			*
201			* @throws Exception - if EngineChannel is set to no map at all
202			* or is set to the default map
203			* @see UsesNoMidiInstrumentMap()
204			* @see UsesDefaultMidiInstrumentMap()
205			*/
206			int GetMidiInstrumentMap() throw (Exception);
207
208			/**
209			* Let this EngineChannel use no MIDI instrument map at all,
210			* that is to let it ignore all MIDI program change messages.
211			*
212			* @see SetMidiInstrumentMapToDefault()
213			* @see SetMidiInstrumentMap()
214			*/
215			void SetMidiInstrumentMapToNone();
216
217			/**
218			* Let this EngineChannel use the default MIDI instrument map to
219			* handle MIDI program changes.
220			*
221			* @see SetMidiInstrumentMapToNone()
222			* @see SetMidiInstrumentMap()
223			*/
224			void SetMidiInstrumentMapToDefault();
225
226			/**
227			* Set a specific MIDI instrument map this EngineChannel should
228			* use to handle MIDI program changes.
229			*
230			* @see SetMidiInstrumentMapToNone()
231			* @see SetMidiInstrumentMapToDefault()
232			*
233			* @throws Exception - in case given map does not exist
234			*/
235			void SetMidiInstrumentMap(int MidiMap) throw (Exception);
236
237	schoenebeck	1041	/**
238			* Set MIDI Registered Parameter Number (RPN) Controller
239			* (upper 8 bits / coarse).
240			*/
241			void SetMidiRpnControllerMsb(uint8_t CtrlMSB);
242
243			/**
244			* Set MIDI Registered Parameter Number (RPN) Controller
245			* (lower 8 bits / fine).
246			*/
247			void SetMidiRpnControllerLsb(uint8_t CtrlLSB);
248
249			/**
250	schoenebeck	1044	* Reset to no RPN controller currently selected.
251			*/
252			void ResetMidiRpnController();
253	schoenebeck	1879
254	schoenebeck	2121	/**
255			* Set MIDI Non-Registered Parameter Number (NRPN) Controller
256			* (upper 8 bits / coarse).
257			*/
258			void SetMidiNrpnControllerMsb(uint8_t CtrlMSB);
259
260			/**
261			* Set MIDI Non-Registered Parameter Number (NRPN) Controller
262			* (lower 8 bits / fine).
263			*/
264			void SetMidiNrpnControllerLsb(uint8_t CtrlLSB);
265
266			/**
267			* Reset to no NRPN controller currently selected.
268			*/
269			void ResetMidiNrpnController();
270
271	iliev	1130	/**
272			* Registers the specified listener to be notified when the number
273			* of effect sends on this channel is changed.
274			*/
275			void AddFxSendCountListener(FxSendCountListener* l);
276	schoenebeck	1044
277			/**
278	iliev	1130	* Removes the specified listener.
279			*/
280			void RemoveFxSendCountListener(FxSendCountListener* l);
281
282			/**
283			* Removes all listeners.
284			*/
285			void RemoveAllFxSendCountListeners();
286
287			/**
288	schoenebeck	1041	* Get currently selected MIDI Registered Parameter Number
289			* (RPN) Controller, this method will return the already merged
290			* value (MSB and LSB value).
291	schoenebeck	1044	*
292			* @e WARNING: you have to call @c ResetMidiRpnController()
293			* after using this value, otherwise all subsequent MIDI CC #6
294			* (Data) messages are interpreted as RPN controller value
295			* messages.
296			*
297			* @returns currently selected RPN controller number, a negative
298			* value if no RPN controller currently selected
299	schoenebeck	1041	*/
300			int GetMidiRpnController();
301
302	iliev	1297	/**
303	schoenebeck	2121	* Get currently selected MIDI Non-Registered Parameter Number
304			* (NRPN) Controller, this method will return the already merged
305			* value (MSB and LSB value).
306			*
307			* @e WARNING: you have to call @c ResetMidiNrpnController()
308			* after using this value, otherwise all subsequent MIDI CC #6
309			* (Data) messages are interpreted as NRPN controller value
310			* messages.
311			*
312			* @returns currently selected NRPN controller number, a negative
313			* value if no NRPN controller currently selected
314			*/
315			int GetMidiNrpnController();
316
317			/**
318	iliev	1297	* Gets the current number of active voices.
319			*/
320			uint GetVoiceCount();
321
322			/**
323			* Sets the current number of active voices.
324			*/
325			void SetVoiceCount(uint Voices);
326
327			/**
328			* Gets the current number of active disk streams.
329			*/
330			uint GetDiskStreamCount();
331
332			/**
333			* Sets the current number of active disk streams.
334			*/
335			void SetDiskStreamCount(uint Streams);
336
337	iliev	1761	SamplerChannel* GetSamplerChannel();
338	schoenebeck	1879
339	iliev	1761	void SetSamplerChannel(SamplerChannel* pChannel);
340	schoenebeck	889
341	iliev	1761	/** Returns the sampler to which this channel belongs */
342			Sampler* GetSampler();
343
344	persson	1924	/**
345			* Performs a program change on the channel.
346			*
347			* This method is not real-time safe.
348			*/
349	persson	2277	void ExecuteProgramChange(uint32_t Program);
350	persson	1924
351	schoenebeck	889	protected:
352	schoenebeck	906	EngineChannel();
353	schoenebeck	1879	virtual ~EngineChannel(); // MUST only be destroyed by EngineChannelFactory
354	iliev	1130
355			/**
356			* Notifies listeners that the number of effect sends
357			* on a this channel is changed.
358			* @param ChannelId The numerical ID of the sampler channel.
359			* @param NewCount The new number of sampler channels.
360			*/
361			void fireFxSendCountChanged(int ChannelId, int NewCount);
362
363	schoenebeck	889	friend class EngineChannelFactory;
364
365			private:
366	persson	1896	struct private_data_t;
367			private_data_t* const p;
368	schoenebeck	889	};
369
370			} // namespace LinuxSampler
371
372			#endif // __LS_ENGINECHANNEL_H__