/[svn]/linuxsampler/trunk/src/engines/common/InstrumentScriptVM.h
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Contents of /linuxsampler/trunk/src/engines/common/InstrumentScriptVM.h

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Revision 2645 - (show annotations) (download) (as text)
Wed Jun 18 00:14:57 2014 UTC (5 years, 8 months ago) by schoenebeck
File MIME type: text/x-c++hdr
File size: 7304 byte(s)
* RT instrument scripts: Pass/preserve polyphonic variable data
  from respective "note" event handler to "release" event handler.
* Fixed theoretical memory leak regarding instrument scripts.
* Bumped version (1.0.0.svn54).

1 /*
2 * Copyright (c) 2014 Christian Schoenebeck
3 *
4 * http://www.linuxsampler.org
5 *
6 * This file is part of LinuxSampler and released under the same terms.
7 * See README file for details.
8 */
9
10 #ifndef LS_INSTRUMENT_SCRIPT_VM_H
11 #define LS_INSTRUMENT_SCRIPT_VM_H
12
13 #include "../../common/global.h"
14 #include "../../common/ConstCapacityArray.h"
15 #include "../../scriptvm/ScriptVM.h"
16 #include "Event.h"
17 #include "../../common/Pool.h"
18 #include "InstrumentScriptVMFunctions.h"
19
20 #define INSTR_SCRIPT_EVENT_GROUPS 28
21
22 namespace LinuxSampler {
23
24 class AbstractEngineChannel;
25 class InstrumentScript;
26
27 /** @brief List of Event IDs.
28 *
29 * Used for built-in script functions:
30 * by_marks(), set_event_mark(), delete_event_mark()
31 */
32 class EventGroup : protected ConstCapacityArray<int> {
33 public:
34 EventGroup() : ConstCapacityArray<int>(CONFIG_MAX_EVENTS_PER_FRAGMENT), m_script(NULL) {}
35 void insert(int eventID);
36 void erase(int eventID);
37 void setScript(InstrumentScript* pScript) { m_script = pScript; }
38 inline int size() const { return ConstCapacityArray<int>::size(); }
39 inline int& operator[](uint index) { return ConstCapacityArray<int>::operator[](index); }
40 inline const int& operator[](uint index) const { return ConstCapacityArray<int>::operator[](index); }
41 protected:
42 InstrumentScript* m_script;
43 };
44
45 /** @brief Real-time instrument script VM representation.
46 *
47 * Holds the VM representation of all event handlers of the currently loaded
48 * script, ready to be executed by the sampler engine.
49 *
50 * Even thought scripts (or to be more specific their event handler objects)
51 * are shared between sampler engine channels, the InstrumentScript struct
52 * instances though are not shared. Each sampler engine channel has its own
53 * instance of a InstrumentScript struct. That's important, because this
54 * struct also holds engine channel local informations, for example the
55 * events that occured on the respective engine channel.
56 */
57 struct InstrumentScript {
58 VMParserContext* parserContext; ///< VM represenation of the currently loaded script or NULL if not script was loaded. Note that it is also not NULL if parser errors occurred!
59 bool bHasValidScript; ///< True in case there is a valid script currently loaded, false if script processing shall be skipped.
60 VMEventHandler* handlerInit; ///< VM representation of script's initilization callback or NULL if current script did not define such an init handler.
61 VMEventHandler* handlerNote; ///< VM representation of script's MIDI note on callback or NULL if current script did not define such an event handler.
62 VMEventHandler* handlerRelease; ///< VM representation of script's MIDI note off callback or NULL if current script did not define such an event handler.
63 VMEventHandler* handlerController; ///< VM representation of script's MIDI controller callback or NULL if current script did not define such an event handler.
64 Pool<ScriptEvent>* pEvents; ///< Pool of all available script execution instances. ScriptEvents available to be allocated from the Pool are currently unused / not executiong, whereas the ScriptEvents allocated on the list are currently suspended / have not finished execution yet (@see pKeyEvents).
65 RTList<ScriptEvent>* pKeyEvents[128]; ///< Stores previously finished executed "note on" script events for the respective active note/key as long as the key/note is active. This is however only done if there is a "note" script event handler and a "release" script event handler defined in the script and both handlers use (reference) polyphonic variables. If that is not the case, then this list is not used at all. So the purpose of pKeyEvents is only to implement preserving/passing polyphonic variable data from "on note .. end on" script block to the respective "on release .. end on" script block.
66 AbstractEngineChannel* pEngineChannel;
67 String code; ///< Source code of the instrument script. Used in case the sampler engine is changed, in that case a new ScriptVM object is created for the engine and VMParserContext object for this script needs to be recreated as well. Thus the script is then parsed again by passing the source code to recreate the parser context.
68 EventGroup eventGroups[INSTR_SCRIPT_EVENT_GROUPS]; ///< Used for built-in script functions: by_event_marks(), set_event_mark(), delete_event_mark().
69
70 InstrumentScript(AbstractEngineChannel* pEngineChannel);
71 ~InstrumentScript();
72
73 void load(const String& text);
74 void unload();
75 void resetAll();
76 };
77
78 /** @brief Real-time instrument script virtual machine.
79 *
80 * Extends the core ScriptVM implementation with MIDI specific built-in
81 * script functions and MIDI specific built-in script variables required
82 * for MIDI processing by instrument script for all sampler engine
83 * implementations (sampler formats) of this sampler.
84 *
85 * Note that this class is currently re-entrant safe, but @b not thread
86 * safe! See also comments of base class ScriptVM regarding this issue.
87 */
88 class InstrumentScriptVM : public ScriptVM {
89 public:
90 InstrumentScriptVM();
91 VMExecStatus_t exec(VMParserContext* parserCtx, ScriptEvent* event);
92 VMFunction* functionByName(const String& name) OVERRIDE;
93 std::map<String,VMIntRelPtr*> builtInIntVariables() OVERRIDE;
94 std::map<String,VMInt8Array*> builtInIntArrayVariables() OVERRIDE;
95 std::map<String,int> builtInConstIntVariables() OVERRIDE;
96 protected:
97 ScriptEvent* m_event; ///< The event currently executed by exec().
98
99 // buil-in script variables
100 VMInt8Array m_CC;
101 VMInt8RelPtr m_CC_NUM;
102 VMIntRelPtr m_EVENT_ID;
103 VMInt8RelPtr m_EVENT_NOTE;
104 VMInt8RelPtr m_EVENT_VELOCITY;
105 VMInt8Array m_KEY_DOWN;
106 //VMIntArray m_POLY_AT; //TODO: ...
107 //int m_POLY_AT_NUM; //TODO: ...
108
109 // buil-in script functions
110 InstrumentScriptVMFunction_play_note m_fnPlayNote;
111 InstrumentScriptVMFunction_set_controller m_fnSetController;
112 InstrumentScriptVMFunction_ignore_event m_fnIgnoreEvent;
113 InstrumentScriptVMFunction_ignore_controller m_fnIgnoreController;
114 InstrumentScriptVMFunction_note_off m_fnNoteOff;
115 InstrumentScriptVMFunction_set_event_mark m_fnSetEventMark;
116 InstrumentScriptVMFunction_delete_event_mark m_fnDeleteEventMark;
117 InstrumentScriptVMFunction_by_marks m_fnByMarks;
118
119 friend class InstrumentScriptVMFunction_play_note;
120 friend class InstrumentScriptVMFunction_set_controller;
121 friend class InstrumentScriptVMFunction_ignore_event;
122 friend class InstrumentScriptVMFunction_ignore_controller;
123 friend class InstrumentScriptVMFunction_note_off;
124 friend class InstrumentScriptVMFunction_set_event_mark;
125 friend class InstrumentScriptVMFunction_delete_event_mark;
126 friend class InstrumentScriptVMFunction_by_marks;
127 };
128
129 } // namespace LinuxSampler
130
131 #endif // LS_INSTRUMENT_SCRIPT_VM_H

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