src/engines/InstrumentManager.h

/***************************************************************************
 *                                                                         *
 *   LinuxSampler - modular, streaming capable sampler                     *
 *                                                                         *
 *   Copyright (C) 2003, 2004 by Benno Senoner and Christian Schoenebeck   *
 *   Copyright (C) 2005 - 2007 Christian Schoenebeck                       *
 *                                                                         *
 *   This library 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 library 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 library; if not, write to the Free Software           *
 *   Foundation, Inc., 59 Temple Place, Suite 330, Boston,                 *
 *   MA  02111-1307  USA                                                   *
 ***************************************************************************/

#ifndef __LS_INSTRUMENTMANAGER_H__
#define __LS_INSTRUMENTMANAGER_H__

#include "../common/global.h"
#include "../common/Exception.h"

#include <vector>

namespace LinuxSampler {

    // just symbol prototyping
    class EngineChannel;

    /**
     * Will be thrown by InstrumentManager implementations on errors.
     */
    class InstrumentManagerException : public Exception {
        public:
            InstrumentManagerException(String msg) : Exception(msg) {}
    };

    /** @brief Abstract interface class for InstrumentManagers.
     *
     * Sampler engines should provide an InstrumentManager for allowing
     * detailed information retrieval and setting of its managed instruments
     * through this general API.
     */
    class InstrumentManager {
        public:
            /**
             * Defines life-time of an instrument.
             */
            enum mode_t {
                ON_DEMAND      = 0, ///< Instrument will be loaded when needed, freed once not needed anymore.
                ON_DEMAND_HOLD = 1, ///< Instrument will be loaded when needed and kept even if not needed anymore.
                PERSISTENT     = 2  ///< Instrument will immediately be loaded and kept all the time.
            };

            /**
             * Reflects unique ID of an instrument.
             */
            struct instrument_id_t {
                String FileName; ///< File name of the instrument.
                uint   Index;    ///< Index of the instrument within the file.

                // TODO: we should extend operator<() so it will be able to detect that file x and file y are actually the same files, e.g. because one of them is a symlink / share the same inode
                bool operator<(const instrument_id_t& o) const {
                    return (Index < o.Index || (Index == o.Index && FileName < o.FileName));
                }
            };

            /**
             * Returns all managed instruments.
             *
             * This method has to be implemented by the descendant.
             */
            virtual std::vector<instrument_id_t> Instruments() = 0;

            /**
             * Returns the current life-time strategy for the given
             * instrument.
             *
             * This method has to be implemented by the descendant.
             */
            virtual mode_t GetMode(const instrument_id_t& ID) = 0;

            /**
             * Change the current life-time strategy for the given
             * instrument.
             *
             * This method has to be implemented by the descendant.
             */
            virtual void SetMode(const instrument_id_t& ID, mode_t Mode) = 0;

            /**
             * Same as SetMode(), but with the difference that this method
             * won't block.
             */
            void SetModeInBackground(const instrument_id_t& ID, mode_t Mode);

            /**
             * Same as loading the given instrument directly on the given
             * EngineChannel, but this method will not block, instead it
             * will load the instrument in a separate thread.
             *
             * @param ID - the instrument to be loaded
             * @param pEngineChannel - on which engine channel the instrument
             *                         should be loaded
             */
            static void LoadInstrumentInBackground(instrument_id_t ID, EngineChannel* pEngineChannel);

            /**
             * Returns the name of the given instrument as reflected by its
             * file.
             *
             * This method has to be implemented by the descendant.
             */
            virtual String GetInstrumentName(instrument_id_t ID) = 0;

            /**
             * Returns a textual identifier of the data structure for the
             * given loaded instrument, which usually reflects the name of
             * of the library used to load the instrument (i.e. "libgig").
             *
             * This method has to be implemented by the descendant.
             */
            virtual String GetInstrumentDataStructureName(instrument_id_t ID) = 0;

            /**
             * Returns the version of the data structure for the given
             * loaded instrument, which usually reflects the version of the
             * library which was used to load the instrument (i.e. "3.1.0").
             *
             * This method has to be implemented by the descendant.
             */
            virtual String GetInstrumentDataStructureVersion(instrument_id_t ID) = 0;

            /**
             * Spawn an appropriate editor for the given instrument that is
             * actually capable to handle the instrument's format and data
             * structure. The instrument editor will be hosted in the
             * sampler's own process to allow immediate live-editing of the
             * instrument while playing the instrument in parallel by the
             * sampler.
             *
             * For this to work, instrument editor applications have to
             * implement the abstract interface class @c InstrumentEditor
             * and have to generate a plugin DLL that has to be placed into
             * the appropriate plugin directory of the sampler.
             *
             * This method has to be implemented by the descendant.
             *
             * @throws InstrumentManagerException - in case no compatible
             *         instrument editor is registered to the sampler
             */
            virtual void LaunchInstrumentEditor(instrument_id_t ID) throw (InstrumentManagerException) = 0;
    };

}

#endif // __LS_INSTRUMENTMANAGER_H__
1	/***************************************************************************
2	* *
3	* LinuxSampler - modular, streaming capable sampler *
4	* *
5	* Copyright (C) 2003, 2004 by Benno Senoner and Christian Schoenebeck *
6	* Copyright (C) 2005 - 2007 Christian Schoenebeck *
7	* *
8	* This library is free software; you can redistribute it and/or modify *
9	* it under the terms of the GNU General Public License as published by *
10	* the Free Software Foundation; either version 2 of the License, or *
11	* (at your option) any later version. *
12	* *
13	* This library is distributed in the hope that it will be useful, *
14	* but WITHOUT ANY WARRANTY; without even the implied warranty of *
15	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
16	* GNU General Public License for more details. *
17	* *
18	* You should have received a copy of the GNU General Public License *
19	* along with this library; if not, write to the Free Software *
20	* Foundation, Inc., 59 Temple Place, Suite 330, Boston, *
21	* MA 02111-1307 USA *
22	***************************************************************************/
23
24	#ifndef __LS_INSTRUMENTMANAGER_H__
25	#define __LS_INSTRUMENTMANAGER_H__
26
27	#include "../common/global.h"
28	#include "../common/Exception.h"
29
30	#include <vector>
31
32	namespace LinuxSampler {
33
34	// just symbol prototyping
35	class EngineChannel;
36
37	/**
38	* Will be thrown by InstrumentManager implementations on errors.
39	*/
40	class InstrumentManagerException : public Exception {
41	public:
42	InstrumentManagerException(String msg) : Exception(msg) {}
43	};
44
45	/** @brief Abstract interface class for InstrumentManagers.
46	*
47	* Sampler engines should provide an InstrumentManager for allowing
48	* detailed information retrieval and setting of its managed instruments
49	* through this general API.
50	*/
51	class InstrumentManager {
52	public:
53	/**
54	* Defines life-time of an instrument.
55	*/
56	enum mode_t {
57	ON_DEMAND = 0, ///< Instrument will be loaded when needed, freed once not needed anymore.
58	ON_DEMAND_HOLD = 1, ///< Instrument will be loaded when needed and kept even if not needed anymore.
59	PERSISTENT = 2 ///< Instrument will immediately be loaded and kept all the time.
60	};
61
62	/**
63	* Reflects unique ID of an instrument.
64	*/
65	struct instrument_id_t {
66	String FileName; ///< File name of the instrument.
67	uint Index; ///< Index of the instrument within the file.
68
69	// TODO: we should extend operator<() so it will be able to detect that file x and file y are actually the same files, e.g. because one of them is a symlink / share the same inode
70	bool operator<(const instrument_id_t& o) const {
71	return (Index < o.Index \|\| (Index == o.Index && FileName < o.FileName));
72	}
73	};
74
75	/**
76	* Returns all managed instruments.
77	*
78	* This method has to be implemented by the descendant.
79	*/
80	virtual std::vector<instrument_id_t> Instruments() = 0;
81
82	/**
83	* Returns the current life-time strategy for the given
84	* instrument.
85	*
86	* This method has to be implemented by the descendant.
87	*/
88	virtual mode_t GetMode(const instrument_id_t& ID) = 0;
89
90	/**
91	* Change the current life-time strategy for the given
92	* instrument.
93	*
94	* This method has to be implemented by the descendant.
95	*/
96	virtual void SetMode(const instrument_id_t& ID, mode_t Mode) = 0;
97
98	/**
99	* Same as SetMode(), but with the difference that this method
100	* won't block.
101	*/
102	void SetModeInBackground(const instrument_id_t& ID, mode_t Mode);
103
104	/**
105	* Same as loading the given instrument directly on the given
106	* EngineChannel, but this method will not block, instead it
107	* will load the instrument in a separate thread.
108	*
109	* @param ID - the instrument to be loaded
110	* @param pEngineChannel - on which engine channel the instrument
111	* should be loaded
112	*/
113	static void LoadInstrumentInBackground(instrument_id_t ID, EngineChannel* pEngineChannel);
114
115	/**
116	* Returns the name of the given instrument as reflected by its
117	* file.
118	*
119	* This method has to be implemented by the descendant.
120	*/
121	virtual String GetInstrumentName(instrument_id_t ID) = 0;
122
123	/**
124	* Returns a textual identifier of the data structure for the
125	* given loaded instrument, which usually reflects the name of
126	* of the library used to load the instrument (i.e. "libgig").
127	*
128	* This method has to be implemented by the descendant.
129	*/
130	virtual String GetInstrumentDataStructureName(instrument_id_t ID) = 0;
131
132	/**
133	* Returns the version of the data structure for the given
134	* loaded instrument, which usually reflects the version of the
135	* library which was used to load the instrument (i.e. "3.1.0").
136	*
137	* This method has to be implemented by the descendant.
138	*/
139	virtual String GetInstrumentDataStructureVersion(instrument_id_t ID) = 0;
140
141	/**
142	* Spawn an appropriate editor for the given instrument that is
143	* actually capable to handle the instrument's format and data
144	* structure. The instrument editor will be hosted in the
145	* sampler's own process to allow immediate live-editing of the
146	* instrument while playing the instrument in parallel by the
147	* sampler.
148	*
149	* For this to work, instrument editor applications have to
150	* implement the abstract interface class @c InstrumentEditor
151	* and have to generate a plugin DLL that has to be placed into
152	* the appropriate plugin directory of the sampler.
153	*
154	* This method has to be implemented by the descendant.
155	*
156	* @throws InstrumentManagerException - in case no compatible
157	* instrument editor is registered to the sampler
158	*/
159	virtual void LaunchInstrumentEditor(instrument_id_t ID) throw (InstrumentManagerException) = 0;
160	};
161
162	}
163
164	#endif // __LS_INSTRUMENTMANAGER_H__