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; ///< Returns the file name of the currently loaded instrument. Equivalent as calling InstrumentFileName(0).
            virtual String  InstrumentFileName(int index);
            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	/***************************************************************************
2	* *
3	* Copyright (C) 2005 - 2012 Christian Schoenebeck *
4	* *
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	#include "../EventListeners.h"
25	#include "../drivers/audio/AudioOutputDevice.h"
26	#include "../drivers/midi/midi.h"
27	#include "../drivers/midi/MidiInputDevice.h"
28	#include "../drivers/midi/MidiInputPort.h"
29	#include "../drivers/midi/VirtualMidiDevice.h"
30	#include "Engine.h"
31	#include "FxSend.h"
32
33	namespace LinuxSampler {
34
35	// just symbol prototyping
36	class Sampler;
37	class SamplerChannel;
38	class AudioOutputDevice;
39	class MidiInputPort;
40	class FxSend;
41
42
43	/** @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	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	virtual void SendProgramChange(uint8_t Program) = 0;
73	virtual bool StatusChanged(bool bNewStatus = false) = 0;
74	virtual float Volume() = 0;
75	virtual void Volume(float f) = 0;
76	virtual float Pan() = 0;
77	virtual void Pan(float f) = 0;
78	virtual uint Channels() = 0;
79	virtual void Connect(AudioOutputDevice* pAudioOut) = 0;
80	virtual void DisconnectAudioOutputDevice() = 0;
81	virtual AudioOutputDevice* GetAudioOutputDevice() = 0;
82	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; ///< Returns the file name of the currently loaded instrument. Equivalent as calling InstrumentFileName(0).
89	virtual String InstrumentFileName(int index);
90	virtual String InstrumentName() = 0;
91	virtual int InstrumentIndex() = 0;
92	virtual int InstrumentStatus() = 0;
93	virtual Engine* GetEngine() = 0;
94	virtual String EngineName() = 0;
95	virtual FxSend* AddFxSend(uint8_t MidiCtrl, String Name = "") throw (Exception) = 0;
96	virtual FxSend* GetFxSend(uint FxSendIndex) = 0;
97	virtual uint GetFxSendCount() = 0;
98	virtual void RemoveFxSend(FxSend* pFxSend) = 0;
99	virtual void Connect(VirtualMidiDevice* pDevice) = 0;
100	virtual void Disconnect(VirtualMidiDevice* pDevice) = 0;
101
102
103	/////////////////////////////////////////////////////////////////
104	// normal methods
105	// (usually not to be overridden by descendant)
106
107	/**
108	* Sets the mute state of this channel.
109	*
110	* @param state - specifies the mute state of this sampler channel.
111	* @throws Exception - if state does not contain valid
112	* value.
113	*/
114	void SetMute(int state) throw (Exception);
115
116	/**
117	* Determines whether this channel is muted.
118	*
119	* @returns 1 if the channel is muted, 0 if the channel is not muted
120	* and -1 if the channel is muted because of presence of at least
121	* one solo channel.
122	*/
123	int GetMute();
124
125	/**
126	* Sets the solo state of this channel.
127	*
128	* @param solo - specifies whether this is a solo channel.
129	*/
130	void SetSolo(bool solo);
131
132	/**
133	* Determines whether this is a solo channel.
134	*
135	* @returns true if this is a solo channel, false otherwise.
136	*/
137	bool GetSolo();
138
139	/**
140	* Returns current MIDI program (change) number of this
141	* EngineChannel.
142	*/
143	uint8_t GetMidiProgram();
144
145	/**
146	* Change EngineChannel's MIDI program.
147	*/
148	void SetMidiProgram(uint8_t Program);
149
150	/**
151	* Returns current MIDI bank MSB (coarse) number of this
152	* EngineChannel.
153	*/
154	uint8_t GetMidiBankMsb();
155
156	/**
157	* Change current MIDI bank MSB (coarse) number of this
158	* EngineChannel.
159	*/
160	void SetMidiBankMsb(uint8_t BankMSB);
161
162	/**
163	* Returns current MIDI bank LSB (fine) number of this
164	* EngineChannel.
165	*/
166	uint8_t GetMidiBankLsb();
167
168	/**
169	* Change current MIDI bank LSB (fine) number of this
170	* EngineChannel.
171	*/
172	void SetMidiBankLsb(uint8_t BankLSB);
173
174	/**
175	* Returns true if this EngineChannel is using no MIDI
176	* instrument map at all, that is if it will ignore all MIDI
177	* program change messages.
178	*
179	* @see UsesDefaultMidiInstrumentMap()
180	* @see GetMidiInstrumentMap()
181	*/
182	bool UsesNoMidiInstrumentMap();
183
184	/**
185	* Returns true if this EngineChannel is using the default MIDI
186	* instrument map for handling MIDI program changes.
187	*
188	* @see UsesNoMidiInstrumentMap()
189	* @see GetMidiInstrumentMap()
190	*/
191	bool UsesDefaultMidiInstrumentMap();
192
193	/**
194	* Returns ID of the MIDI instrument map currently used by this
195	* EngineChannel to handle MIDI program changes. You should
196	* always call @c UsesNoMidiInstrumentMap() and
197	* @c UsesDefaultMidiInstrumentMap() before calling this method
198	* to check if this EngineChannel is probably using the default
199	* map or no map at all, because in these two particular cases
200	* this method would throw an exception!
201	*
202	* @throws Exception - if EngineChannel is set to no map at all
203	* or is set to the default map
204	* @see UsesNoMidiInstrumentMap()
205	* @see UsesDefaultMidiInstrumentMap()
206	*/
207	int GetMidiInstrumentMap() throw (Exception);
208
209	/**
210	* Let this EngineChannel use no MIDI instrument map at all,
211	* that is to let it ignore all MIDI program change messages.
212	*
213	* @see SetMidiInstrumentMapToDefault()
214	* @see SetMidiInstrumentMap()
215	*/
216	void SetMidiInstrumentMapToNone();
217
218	/**
219	* Let this EngineChannel use the default MIDI instrument map to
220	* handle MIDI program changes.
221	*
222	* @see SetMidiInstrumentMapToNone()
223	* @see SetMidiInstrumentMap()
224	*/
225	void SetMidiInstrumentMapToDefault();
226
227	/**
228	* Set a specific MIDI instrument map this EngineChannel should
229	* use to handle MIDI program changes.
230	*
231	* @see SetMidiInstrumentMapToNone()
232	* @see SetMidiInstrumentMapToDefault()
233	*
234	* @throws Exception - in case given map does not exist
235	*/
236	void SetMidiInstrumentMap(int MidiMap) throw (Exception);
237
238	/**
239	* Set MIDI Registered Parameter Number (RPN) Controller
240	* (upper 8 bits / coarse).
241	*/
242	void SetMidiRpnControllerMsb(uint8_t CtrlMSB);
243
244	/**
245	* Set MIDI Registered Parameter Number (RPN) Controller
246	* (lower 8 bits / fine).
247	*/
248	void SetMidiRpnControllerLsb(uint8_t CtrlLSB);
249
250	/**
251	* Reset to no RPN controller currently selected.
252	*/
253	void ResetMidiRpnController();
254
255	/**
256	* Set MIDI Non-Registered Parameter Number (NRPN) Controller
257	* (upper 8 bits / coarse).
258	*/
259	void SetMidiNrpnControllerMsb(uint8_t CtrlMSB);
260
261	/**
262	* Set MIDI Non-Registered Parameter Number (NRPN) Controller
263	* (lower 8 bits / fine).
264	*/
265	void SetMidiNrpnControllerLsb(uint8_t CtrlLSB);
266
267	/**
268	* Reset to no NRPN controller currently selected.
269	*/
270	void ResetMidiNrpnController();
271
272	/**
273	* Registers the specified listener to be notified when the number
274	* of effect sends on this channel is changed.
275	*/
276	void AddFxSendCountListener(FxSendCountListener* l);
277
278	/**
279	* Removes the specified listener.
280	*/
281	void RemoveFxSendCountListener(FxSendCountListener* l);
282
283	/**
284	* Removes all listeners.
285	*/
286	void RemoveAllFxSendCountListeners();
287
288	/**
289	* Get currently selected MIDI Registered Parameter Number
290	* (RPN) Controller, this method will return the already merged
291	* value (MSB and LSB value).
292	*
293	* @e WARNING: you have to call @c ResetMidiRpnController()
294	* after using this value, otherwise all subsequent MIDI CC #6
295	* (Data) messages are interpreted as RPN controller value
296	* messages.
297	*
298	* @returns currently selected RPN controller number, a negative
299	* value if no RPN controller currently selected
300	*/
301	int GetMidiRpnController();
302
303	/**
304	* Get currently selected MIDI Non-Registered Parameter Number
305	* (NRPN) Controller, this method will return the already merged
306	* value (MSB and LSB value).
307	*
308	* @e WARNING: you have to call @c ResetMidiNrpnController()
309	* after using this value, otherwise all subsequent MIDI CC #6
310	* (Data) messages are interpreted as NRPN controller value
311	* messages.
312	*
313	* @returns currently selected NRPN controller number, a negative
314	* value if no NRPN controller currently selected
315	*/
316	int GetMidiNrpnController();
317
318	/**
319	* Gets the current number of active voices.
320	*/
321	uint GetVoiceCount();
322
323	/**
324	* Sets the current number of active voices.
325	*/
326	void SetVoiceCount(uint Voices);
327
328	/**
329	* Gets the current number of active disk streams.
330	*/
331	uint GetDiskStreamCount();
332
333	/**
334	* Sets the current number of active disk streams.
335	*/
336	void SetDiskStreamCount(uint Streams);
337
338	SamplerChannel* GetSamplerChannel();
339
340	void SetSamplerChannel(SamplerChannel* pChannel);
341
342	/** Returns the sampler to which this channel belongs */
343	Sampler* GetSampler();
344
345	/**
346	* Performs a program change on the channel.
347	*
348	* This method is not real-time safe.
349	*/
350	void ExecuteProgramChange(uint32_t Program);
351
352	protected:
353	EngineChannel();
354	virtual ~EngineChannel(); // MUST only be destroyed by EngineChannelFactory
355
356	/**
357	* Notifies listeners that the number of effect sends
358	* on a this channel is changed.
359	* @param ChannelId The numerical ID of the sampler channel.
360	* @param NewCount The new number of sampler channels.
361	*/
362	void fireFxSendCountChanged(int ChannelId, int NewCount);
363
364	friend class EngineChannelFactory;
365
366	private:
367	struct private_data_t;
368	private_data_t* const p;
369	};
370
371	} // namespace LinuxSampler
372
373	#endif // __LS_ENGINECHANNEL_H__