src/plugins/InstrumentEditor.h

/***************************************************************************
 *                                                                         *
 *   Copyright (C) 2007, 2008 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_INSTRUMENT_EDITOR_H
#define LS_INSTRUMENT_EDITOR_H

#include "../common/global.h"
#include "../common/Thread.h"
#include "../drivers/midi/VirtualMidiDevice.h"

#include <set>

namespace LinuxSampler {

    // just symbol prototyping
    class InstrumentEditorListener;

    /** @brief Instrument Editor Interface (external plugin)
     *
     * LinuxSampler allows to spawn arbitrary instrument editor applications
     * within the sampler's own process. That way instrument editors are
     * able to modify already loaded instruments live or on-the-fly, that is
     * without having to load it again neither on sampler nor on editor side,
     * which is essential for editing large instruments.
     *
     * Instrument editors have to implement this abstract base class, embedded
     * into a DLL and placed into the respective sampler's library path. The
     * sampler will load these external DLLs as plugins on startup. Whenever
     * there's a request for editing an instrument, the sampler will try to
     * launch a matching registered editor, by calling the respective
     * plugin's @c Main() method.
     */
    class InstrumentEditor : public VirtualMidiDevice, protected Thread {
    public:

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

        /**
         * Entry point for the instrument editor's thread. As the
         * instrument data structure is passed as typeless (void*)
         * pointer, this is not type safe! The implementing instrument
         * editor has to interpret the @a sTypeName and @a sTypeVersion
         * arguments to determine if it's able to cast the instrument
         * pointer to a known type and actually be able to work with it.
         *
         * @param pInstrument - pointer to the respective instrument object
         * @param sTypeName - format of the instrument data structure
         *                    (i.e. @c "libgig" )
         * @param sTypeVersion - version of the instrument data structure
         *                       (i.e. @c "3.0.1" ).
         */
        virtual int Main(void* pInstrument, String sTypeName, String sTypeVersion) = 0;

        /**
         * The instrument editor has to return @c true in case it supports
         * the given instrument data structure type and version, it has to
         * return @c false otherwise. This method will be called by the
         * sampler to determine which editor is capable to work with a
         * certain instrument.
         *
         * @param sTypeName - i.e. @c "libgig"
         * @param sTypeVersion - i.e. @c "3.0.1"
         */
        virtual bool IsTypeSupported(String sTypeName, String sTypeVersion) = 0;

        /**
         * The instrument editor's name (i.e. @c "gigedit" ).
         */
        virtual String Name() = 0;

        /**
         * The instrument editor's version (i.e. @c "0.0.1" ).
         */
        virtual String Version() = 0;

        /**
         * Arbitrary textual description of the instrument editor
         * (i.e. "Gigasampler and DLS format editor, GTK based").
         */
        virtual String Description() = 0;


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

        /** @brief Dispatch pending sample removal event.
         *
         * @e SHOULD be called by the instrument editor @e before deleting
         * samples, so the sampler can react by stopping usage of these
         * samples to avoid a crash.
         *
         * After calling this method, the instrument editor @e MUST call
         * @c NotifySamplesRemoved() after it actually deleted the samples, so
         * the sampler can react by i.e. resuming playback of sampler engines.
         *
         * @param Samples - list of samples that will be deleted by the
         *                  instrument editor
         */
        void NotifySamplesToBeRemoved(std::set<void*> Samples);

        /** @brief Dispatch completed sample removal event.
         *
         * Inform the sampler that the by @c NotifySamplesToBeRemoved()
         * previously announced samples have been deleted.
         */
        void NotifySamplesRemoved();

        /** @brief Dispatch pending data structure modification event.
         *
         * @e SHOULD be called by the instrument editor @e before modifying
         * data structures (except samples, which have their own dispatch
         * methods) which could otherwise lead to undesired synchronisation
         * issues and a crash. The respective data structure is passed as a
         * typeless pointer @a pStruct , so the instrument editor additionally
         * has to pass the name of the data structure (i.e. @c "gig::Region" ),
         * so the sampler can cast the pointer to an appropriate type. The
         * sampler will react by stopping usage of the respective data
         * structure.
         *
         * After calling this method, the instrument editor @e MUST call
         * @c NotifyDataStructureChanged() , so the sampler can react by
         * resuming usage of the respective data structure for playback.
         *
         * @param pStruct     - data structure going to be modified
         * @param sStructType - name of the data structure (i.e. its C++
         *                      struct or class name)
         */
        void NotifyDataStructureToBeChanged(void* pStruct, String sStructType);

        /** @brief Dispatch completed data structure modification event.
         *
         * Inform the sampler that the by @c NotifyDataStructureToBeChanged()
         * previously announced data structure has been completely modified.
         *
         * @param pStruct     - data structure that has been modified
         * @param sStructType - name of the data structure (i.e. its C++
         *                      struct or class name)
         */
        void NotifyDataStructureChanged(void* pStruct, String sStructType);

        /** @brief Dispatch sample reference changed event.
         *
         * @e SHOULD be called by the instrument editor @e after a certain data
         * structure changed its reference / pointer to a sample, so the
         * sampler can react by:
         *
         * - Caching the newly referenced sample if necessary.
         * - Un-caching the old referenced sample if necessary.
         *
         * @e Note: the instrument editor additionally @e MUST embed this call
         * into the respective @c NotifyDataStructureToBeChanged() and
         * @c NotifyDataStructureChanged() calls for announcing the data
         * structure whose sample reference is actually to be changed, so the
         * sampler can react by suspending usage. For example:
         * @code
         *  NotifyDataStructureToBeChanged(pDimReg, "gig::DimensionRegion");
         *  gig::Sample* pOldSample = pDimReg->pSample;
         *  pDimReg->pSample = pNewSample;
         *  NotifySampleReferenceChanged(pOldSample, pNewSample);
         *  NotifyDataStructureChanged(pDimReg, "gig::DimensionRegion");
         * @endcode
         * So calling this method alone is not safe!
         *
         * @param pOldSample - previous sample reference
         * @param pNewSample - current sample reference
         */
        void NotifySampleReferenceChanged(void* pOldSample, void* pNewSample);

        /**
         * Launch the instrument editor for the given instrument. The
         * editor will be spawned in its own thread and this method will
         * return as soon as the editor's thread actually started.
         */
        void Launch(void* pInstrument, String sTypeName, String sTypeVersion);

        /**
         * Registers object that wants to be notified on events.
         */
        void AddListener(InstrumentEditorListener* pListener);

        /**
         * Unregisters object that doesn't want to be notified anymore.
         */
        void RemoveListener(InstrumentEditorListener* pListener);

        /**
         * Constructor
         */
        InstrumentEditor();

        /**
         * Destructor
         */
        virtual ~InstrumentEditor();

    protected:
        std::set<InstrumentEditorListener*> listeners;

        // derived abstract method from base class 'Thread'
        virtual int Main();
    private:
        void*    pInstrument;
        String   sTypeName;
        String   sTypeVersion;
    };

    /** @brief Instrument Editor Notifications
     *
     * This abstract interface class has to be implemented by classes that
     * want to be notified on certain events of an instrument editor. This is
     * typically used on sampler side, but might also be used by an instrument
     * editor to get informed about modifications another instrument editor
     * makes.
     */
    class InstrumentEditorListener {
    public:
        /** @brief Called after the instrument editor stopped running.
         *
         * Automatically called after the instrument editor application stopped
         * running. This method has to be implemented by the descendant.
         *
         * @param pSender - instrument editor that died
         */
        virtual void OnInstrumentEditorQuit(InstrumentEditor* pSender) = 0;

        /** @brief Called before samples are to be deleted.
         *
         * See the dispatcher method
         * @c InstrumentEditor::NotifySamplesToBeRemoved() for details.
         * This method has to be implemented by the descendant.
         *
         * @param Samples - list of samples that will be deleted by the
         *                  instrument editor
         * @param pSender - instrument editor that is going to do this
         *                  modification
         */
        virtual void OnSamplesToBeRemoved(std::set<void*> Samples, InstrumentEditor* pSender) = 0;

        /** @brief  Called after samples have been deleted.
         *
         * See the dispatcher method
         * @c InstrumentEditor::NotifySamplesRemoved() for details.
         * This method has to be implemented by the descendant.
         *
         * @param pSender - instrument editor that did this modification
         */
        virtual void OnSamplesRemoved(InstrumentEditor* pSender) = 0;

        /** @brief Called before data structure is to be modified.
         *
         * See the dispatcher method
         * @c InstrumentEditor::NotifyDataStructureToBeChanged() for details.
         * This method has to be implemented by the descendant.
         *
         * @param pStruct     - data structure going to be modified
         * @param sStructType - name of the data structure (i.e. its C++
         *                      struct or class name)
         * @param pSender     - instrument editor that is going to do this
         *                      modification
         */
        virtual void OnDataStructureToBeChanged(void* pStruct, String sStructType, InstrumentEditor* pSender) = 0;

        /** @brief Called after data structure has been modified.
         *
         * See the dispatcher method
         * @c InstrumentEditor::NotifyDataStructureChanged() for details.
         * This method has to be implemented by the descendant.
         *
         * @param pStruct     - data structure that has been modified
         * @param sStructType - name of the data structure (i.e. its C++
         *                      struct or class name)
         * @param pSender     - instrument editor that did this modification
         */
        virtual void OnDataStructureChanged(void* pStruct, String sStructType, InstrumentEditor* pSender) = 0;

        /** @brief Called after some data structure changed its reference to a sample.
         *
         * @c InstrumentEditor::NotifySampleReferenceChanged() for details.
         * This method has to be implemented by the descendant.
         *
         * @param pOldSample - previous sample reference
         * @param pNewSample - current sample reference
         * @param pSender    - instrument editor that did this modification
         */
        virtual void OnSampleReferenceChanged(void* pOldSample, void* pNewSample, InstrumentEditor* pSender) = 0;
    };

} // namespace LinuxSampler

#endif // LS_INSTRUMENT_EDITOR_H
1	schoenebeck	1374	/***************************************************************************
2			* *
3	schoenebeck	1653	* Copyright (C) 2007, 2008 Christian Schoenebeck *
4	schoenebeck	1374	* *
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_INSTRUMENT_EDITOR_H
22			#define LS_INSTRUMENT_EDITOR_H
23
24			#include "../common/global.h"
25			#include "../common/Thread.h"
26	schoenebeck	1659	#include "../drivers/midi/VirtualMidiDevice.h"
27	schoenebeck	1374
28			#include <set>
29
30			namespace LinuxSampler {
31
32			// just symbol prototyping
33			class InstrumentEditorListener;
34
35			/** @brief Instrument Editor Interface (external plugin)
36			*
37			* LinuxSampler allows to spawn arbitrary instrument editor applications
38			* within the sampler's own process. That way instrument editors are
39			* able to modify already loaded instruments live or on-the-fly, that is
40			* without having to load it again neither on sampler nor on editor side,
41			* which is essential for editing large instruments.
42			*
43			* Instrument editors have to implement this abstract base class, embedded
44			* into a DLL and placed into the respective sampler's library path. The
45			* sampler will load these external DLLs as plugins on startup. Whenever
46			* there's a request for editing an instrument, the sampler will try to
47			* launch a matching registered editor, by calling the respective
48			* plugin's @c Main() method.
49			*/
50	schoenebeck	1659	class InstrumentEditor : public VirtualMidiDevice, protected Thread {
51	schoenebeck	1374	public:
52
53			/////////////////////////////////////////////////////////////////
54			// abstract methods
55			// (these have to be implemented by the descendant)
56
57			/**
58			* Entry point for the instrument editor's thread. As the
59			* instrument data structure is passed as typeless (void*)
60			* pointer, this is not type safe! The implementing instrument
61			* editor has to interpret the @a sTypeName and @a sTypeVersion
62			* arguments to determine if it's able to cast the instrument
63			* pointer to a known type and actually be able to work with it.
64			*
65			* @param pInstrument - pointer to the respective instrument object
66			* @param sTypeName - format of the instrument data structure
67			* (i.e. @c "libgig" )
68			* @param sTypeVersion - version of the instrument data structure
69			* (i.e. @c "3.0.1" ).
70			*/
71			virtual int Main(void* pInstrument, String sTypeName, String sTypeVersion) = 0;
72
73			/**
74			* The instrument editor has to return @c true in case it supports
75			* the given instrument data structure type and version, it has to
76			* return @c false otherwise. This method will be called by the
77			* sampler to determine which editor is capable to work with a
78			* certain instrument.
79			*
80			* @param sTypeName - i.e. @c "libgig"
81	schoenebeck	1425	* @param sTypeVersion - i.e. @c "3.0.1"
82	schoenebeck	1374	*/
83			virtual bool IsTypeSupported(String sTypeName, String sTypeVersion) = 0;
84
85			/**
86			* The instrument editor's name (i.e. @c "gigedit" ).
87			*/
88			virtual String Name() = 0;
89
90			/**
91			* The instrument editor's version (i.e. @c "0.0.1" ).
92			*/
93			virtual String Version() = 0;
94
95			/**
96			* Arbitrary textual description of the instrument editor
97			* (i.e. "Gigasampler and DLS format editor, GTK based").
98			*/
99			virtual String Description() = 0;
100
101
102
103			/////////////////////////////////////////////////////////////////
104			// normal methods
105			// (usually not to be overriden by descendant)
106
107			/** @brief Dispatch pending sample removal event.
108			*
109			* @e SHOULD be called by the instrument editor @e before deleting
110			* samples, so the sampler can react by stopping usage of these
111			* samples to avoid a crash.
112			*
113			* After calling this method, the instrument editor @e MUST call
114			* @c NotifySamplesRemoved() after it actually deleted the samples, so
115			* the sampler can react by i.e. resuming playback of sampler engines.
116			*
117			* @param Samples - list of samples that will be deleted by the
118			* instrument editor
119			*/
120			void NotifySamplesToBeRemoved(std::set<void*> Samples);
121
122			/** @brief Dispatch completed sample removal event.
123			*
124			* Inform the sampler that the by @c NotifySamplesToBeRemoved()
125			* previously announced samples have been deleted.
126			*/
127			void NotifySamplesRemoved();
128
129			/** @brief Dispatch pending data structure modification event.
130			*
131			* @e SHOULD be called by the instrument editor @e before modifying
132			* data structures (except samples, which have their own dispatch
133			* methods) which could otherwise lead to undesired synchronisation
134			* issues and a crash. The respective data structure is passed as a
135			* typeless pointer @a pStruct , so the instrument editor additionally
136			* has to pass the name of the data structure (i.e. @c "gig::Region" ),
137			* so the sampler can cast the pointer to an appropriate type. The
138			* sampler will react by stopping usage of the respective data
139			* structure.
140			*
141			* After calling this method, the instrument editor @e MUST call
142			* @c NotifyDataStructureChanged() , so the sampler can react by
143			* resuming usage of the respective data structure for playback.
144			*
145			* @param pStruct - data structure going to be modified
146			* @param sStructType - name of the data structure (i.e. its C++
147			* struct or class name)
148			*/
149			void NotifyDataStructureToBeChanged(void* pStruct, String sStructType);
150
151			/** @brief Dispatch completed data structure modification event.
152			*
153			* Inform the sampler that the by @c NotifyDataStructureToBeChanged()
154			* previously announced data structure has been completely modified.
155			*
156			* @param pStruct - data structure that has been modified
157			* @param sStructType - name of the data structure (i.e. its C++
158			* struct or class name)
159			*/
160			void NotifyDataStructureChanged(void* pStruct, String sStructType);
161
162			/** @brief Dispatch sample reference changed event.
163			*
164			* @e SHOULD be called by the instrument editor @e after a certain data
165			* structure changed its reference / pointer to a sample, so the
166			* sampler can react by:
167			*
168			* - Caching the newly referenced sample if necessary.
169			* - Un-caching the old referenced sample if necessary.
170			*
171			* @e Note: the instrument editor additionally @e MUST embed this call
172			* into the respective @c NotifyDataStructureToBeChanged() and
173			* @c NotifyDataStructureChanged() calls for announcing the data
174			* structure whose sample reference is actually to be changed, so the
175			* sampler can react by suspending usage. For example:
176			* @code
177			* NotifyDataStructureToBeChanged(pDimReg, "gig::DimensionRegion");
178			* gig::Sample* pOldSample = pDimReg->pSample;
179			* pDimReg->pSample = pNewSample;
180			* NotifySampleReferenceChanged(pOldSample, pNewSample);
181			* NotifyDataStructureChanged(pDimReg, "gig::DimensionRegion");
182			* @endcode
183			* So calling this method alone is not safe!
184			*
185			* @param pOldSample - previous sample reference
186			* @param pNewSample - current sample reference
187			*/
188			void NotifySampleReferenceChanged(void* pOldSample, void* pNewSample);
189
190			/**
191			* Launch the instrument editor for the given instrument. The
192			* editor will be spawned in its own thread and this method will
193			* return as soon as the editor's thread actually started.
194			*/
195			void Launch(void* pInstrument, String sTypeName, String sTypeVersion);
196
197			/**
198			* Registers object that wants to be notified on events.
199			*/
200			void AddListener(InstrumentEditorListener* pListener);
201
202			/**
203			* Unregisters object that doesn't want to be notified anymore.
204			*/
205			void RemoveListener(InstrumentEditorListener* pListener);
206
207			/**
208			* Constructor
209			*/
210			InstrumentEditor();
211
212	schoenebeck	1653	/**
213			* Destructor
214			*/
215			virtual ~InstrumentEditor();
216
217	schoenebeck	1374	protected:
218			std::set<InstrumentEditorListener*> listeners;
219
220			// derived abstract method from base class 'Thread'
221			virtual int Main();
222			private:
223			void* pInstrument;
224			String sTypeName;
225			String sTypeVersion;
226			};
227
228			/** @brief Instrument Editor Notifications
229			*
230			* This abstract interface class has to be implemented by classes that
231			* want to be notified on certain events of an instrument editor. This is
232			* typically used on sampler side, but might also be used by an instrument
233			* editor to get informed about modifications another instrument editor
234			* makes.
235			*/
236			class InstrumentEditorListener {
237			public:
238			/** @brief Called after the instrument editor stopped running.
239			*
240			* Automatically called after the instrument editor application stopped
241			* running. This method has to be implemented by the descendant.
242			*
243			* @param pSender - instrument editor that died
244			*/
245			virtual void OnInstrumentEditorQuit(InstrumentEditor* pSender) = 0;
246
247			/** @brief Called before samples are to be deleted.
248			*
249			* See the dispatcher method
250			* @c InstrumentEditor::NotifySamplesToBeRemoved() for details.
251			* This method has to be implemented by the descendant.
252			*
253			* @param Samples - list of samples that will be deleted by the
254			* instrument editor
255			* @param pSender - instrument editor that is going to do this
256			* modification
257			*/
258			virtual void OnSamplesToBeRemoved(std::set<void> Samples, InstrumentEditor pSender) = 0;
259
260			/** @brief Called after samples have been deleted.
261			*
262			* See the dispatcher method
263			* @c InstrumentEditor::NotifySamplesRemoved() for details.
264			* This method has to be implemented by the descendant.
265			*
266			* @param pSender - instrument editor that did this modification
267			*/
268			virtual void OnSamplesRemoved(InstrumentEditor* pSender) = 0;
269
270			/** @brief Called before data structure is to be modified.
271			*
272			* See the dispatcher method
273			* @c InstrumentEditor::NotifyDataStructureToBeChanged() for details.
274			* This method has to be implemented by the descendant.
275			*
276			* @param pStruct - data structure going to be modified
277			* @param sStructType - name of the data structure (i.e. its C++
278			* struct or class name)
279			* @param pSender - instrument editor that is going to do this
280			* modification
281			*/
282			virtual void OnDataStructureToBeChanged(void* pStruct, String sStructType, InstrumentEditor* pSender) = 0;
283
284			/** @brief Called after data structure has been modified.
285			*
286			* See the dispatcher method
287			* @c InstrumentEditor::NotifyDataStructureChanged() for details.
288			* This method has to be implemented by the descendant.
289			*
290			* @param pStruct - data structure that has been modified
291			* @param sStructType - name of the data structure (i.e. its C++
292			* struct or class name)
293			* @param pSender - instrument editor that did this modification
294			*/
295			virtual void OnDataStructureChanged(void* pStruct, String sStructType, InstrumentEditor* pSender) = 0;
296
297			/** @brief Called after some data structure changed its reference to a sample.
298			*
299			* @c InstrumentEditor::NotifySampleReferenceChanged() for details.
300			* This method has to be implemented by the descendant.
301			*
302			* @param pOldSample - previous sample reference
303			* @param pNewSample - current sample reference
304			* @param pSender - instrument editor that did this modification
305			*/
306			virtual void OnSampleReferenceChanged(void* pOldSample, void* pNewSample, InstrumentEditor* pSender) = 0;
307			};
308
309			} // namespace LinuxSampler
310
311			#endif // LS_INSTRUMENT_EDITOR_H