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

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Revision 2645 - (show annotations) (download)
Wed Jun 18 00:14:57 2014 UTC (5 years, 8 months ago) by schoenebeck
File size: 12134 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 #include "InstrumentScriptVM.h"
11 #include "../AbstractEngineChannel.h"
12 #include "../../common/global_private.h"
13 #include "AbstractInstrumentManager.h"
14 #include "MidiKeyboardManager.h"
15
16 namespace LinuxSampler {
17
18 ///////////////////////////////////////////////////////////////////////
19 // class 'EventGroup'
20
21 void EventGroup::insert(int eventID) {
22 if (contains(eventID)) return;
23
24 AbstractEngine* pEngine = m_script->pEngineChannel->pEngine;
25
26 // before adding the new event ID, check if there are any dead events
27 // and remove them in that case, before otherwise we might run in danger
28 // to run out of free space on this group for event IDs if a lot of
29 // events die before being removed explicitly from the group by script
30 //
31 // NOTE: or should we do this "dead ones" check only once in a while?
32 int firstDead = -1;
33 for (int i = 0; i < size(); ++i) {
34 if (firstDead >= 0) {
35 if (pEngine->EventByID(eventID)) {
36 remove(firstDead, i - firstDead);
37 firstDead = -1;
38 }
39 } else {
40 if (!pEngine->EventByID(eventID)) firstDead = i;
41 }
42 }
43
44 append(eventID);
45 }
46
47 void EventGroup::erase(int eventID) {
48 int index = find(eventID);
49 remove(index);
50 }
51
52 ///////////////////////////////////////////////////////////////////////
53 // class 'InstrumentScript'
54
55 InstrumentScript::InstrumentScript(AbstractEngineChannel* pEngineChannel) {
56 parserContext = NULL;
57 bHasValidScript = false;
58 handlerInit = NULL;
59 handlerNote = NULL;
60 handlerRelease = NULL;
61 handlerController = NULL;
62 pEvents = NULL;
63 for (int i = 0; i < 128; ++i)
64 pKeyEvents[i] = NULL;
65 this->pEngineChannel = pEngineChannel;
66 for (int i = 0; i < INSTR_SCRIPT_EVENT_GROUPS; ++i)
67 eventGroups[i].setScript(this);
68 }
69
70 InstrumentScript::~InstrumentScript() {
71 resetAll();
72 if (pEvents) {
73 for (int i = 0; i < 128; ++i) delete pKeyEvents[i];
74 delete pEvents;
75 }
76 }
77
78 /** @brief Load real-time instrument script.
79 *
80 * Loads the real-time instrument script given by @a text on the engine
81 * channel this InstrumentScript object belongs to (defined by
82 * pEngineChannel member variable). The sampler engine's resource manager is
83 * used to allocate and share equivalent scripts on multiple engine
84 * channels.
85 *
86 * @param text - source code of script
87 */
88 void InstrumentScript::load(const String& text) {
89 dmsg(1,("Loading real-time instrument script ... "));
90
91 // hand back old script reference and VM execution contexts
92 // (if not done already)
93 unload();
94
95 code = text;
96
97 AbstractInstrumentManager* pManager =
98 dynamic_cast<AbstractInstrumentManager*>(pEngineChannel->pEngine->GetInstrumentManager());
99
100 // get new script reference
101 parserContext = pManager->scripts.Borrow(text, pEngineChannel);
102 if (!parserContext->errors().empty()) {
103 std::vector<ParserIssue> errors = parserContext->errors();
104 std::cerr << "[ScriptVM] Could not load instrument script, there were "
105 << errors.size() << " parser errors:\n";
106 for (int i = 0; i < errors.size(); ++i)
107 errors[i].dump();
108 return; // stop here if there were any parser errors
109 }
110
111 handlerInit = parserContext->eventHandlerByName("init");
112 handlerNote = parserContext->eventHandlerByName("note");
113 handlerRelease = parserContext->eventHandlerByName("release");
114 handlerController = parserContext->eventHandlerByName("controller");
115 bHasValidScript =
116 handlerInit || handlerNote || handlerRelease || handlerController;
117
118 // amount of script handlers each script event has to execute
119 int handlerExecCount = 0;
120 if (handlerNote || handlerRelease || handlerController) // only one of these are executed after "init" handler
121 handlerExecCount++;
122
123 // create script event pool (if it doesn't exist already)
124 if (!pEvents) {
125 pEvents = new Pool<ScriptEvent>(CONFIG_MAX_EVENTS_PER_FRAGMENT);
126 for (int i = 0; i < 128; ++i)
127 pKeyEvents[i] = new RTList<ScriptEvent>(pEvents);
128 }
129
130 // create new VM execution contexts for new script
131 while (!pEvents->poolIsEmpty()) {
132 RTList<ScriptEvent>::Iterator it = pEvents->allocAppend();
133 it->execCtx = pEngineChannel->pEngine->pScriptVM->createExecContext(
134 parserContext
135 );
136 it->handlers = new VMEventHandler*[handlerExecCount+1];
137 }
138 pEvents->clear();
139
140 dmsg(1,("Done\n"));
141 }
142
143 /** @brief Unload real-time instrument script.
144 *
145 * Unloads the currently used real-time instrument script and frees all
146 * resources allocated for that script. The sampler engine's resource manager
147 * is used to share equivalent scripts among multiple sampler channels, and
148 * to deallocate the parsed script once not used on any engine channel
149 * anymore.
150 *
151 * Calling this method will however not clear the @c code member variable.
152 * Thus, the script can be parsed again afterwards.
153 */
154 void InstrumentScript::unload() {
155 //dmsg(1,("InstrumentScript::unload(this=0x%llx)\n", this));
156
157 if (parserContext)
158 dmsg(1,("Unloading current instrument script.\n"));
159
160 // free allocated VM execution contexts
161 if (pEvents) {
162 pEvents->clear();
163 while (!pEvents->poolIsEmpty()) {
164 RTList<ScriptEvent>::Iterator it = pEvents->allocAppend();
165 if (it->execCtx) {
166 // free VM execution context object
167 delete it->execCtx;
168 it->execCtx = NULL;
169 // free C array of handler pointers
170 delete [] it->handlers;
171 }
172 }
173 pEvents->clear();
174 }
175 // hand back VM representation of script
176 if (parserContext) {
177 AbstractInstrumentManager* pManager =
178 dynamic_cast<AbstractInstrumentManager*>(pEngineChannel->pEngine->GetInstrumentManager());
179
180 pManager->scripts.HandBack(parserContext, pEngineChannel);
181 parserContext = NULL;
182 handlerInit = NULL;
183 handlerNote = NULL;
184 handlerRelease = NULL;
185 handlerController = NULL;
186 }
187 bHasValidScript = false;
188 }
189
190 /**
191 * Same as unload(), but this one also empties the @c code member variable
192 * to an empty string.
193 */
194 void InstrumentScript::resetAll() {
195 unload();
196 code.clear();
197 }
198
199 ///////////////////////////////////////////////////////////////////////
200 // class 'InstrumentScriptVM'
201
202 InstrumentScriptVM::InstrumentScriptVM() :
203 m_event(NULL), m_fnPlayNote(this), m_fnSetController(this),
204 m_fnIgnoreEvent(this), m_fnIgnoreController(this), m_fnNoteOff(this),
205 m_fnSetEventMark(this), m_fnDeleteEventMark(this), m_fnByMarks(this)
206 {
207 m_CC.size = _MEMBER_SIZEOF(AbstractEngineChannel, ControllerTable);
208 m_CC_NUM = DECLARE_VMINT(m_event, class ScriptEvent, cause.Param.CC.Controller);
209 m_EVENT_ID = DECLARE_VMINT(m_event, class ScriptEvent, id);
210 m_EVENT_NOTE = DECLARE_VMINT(m_event, class ScriptEvent, cause.Param.Note.Key);
211 m_EVENT_VELOCITY = DECLARE_VMINT(m_event, class ScriptEvent, cause.Param.Note.Velocity);
212 m_KEY_DOWN.size = 128;
213 }
214
215 VMExecStatus_t InstrumentScriptVM::exec(VMParserContext* parserCtx, ScriptEvent* event) {
216 AbstractEngineChannel* pEngineChannel =
217 static_cast<AbstractEngineChannel*>(event->cause.pEngineChannel);
218
219 // prepare built-in script variables for script execution
220 m_event = event;
221 m_CC.data = (int8_t*) &pEngineChannel->ControllerTable[0];
222 m_KEY_DOWN.data = &pEngineChannel->GetMidiKeyboardManager()->KeyDown[0];
223
224 // if script is in start condition, then do mandatory MIDI event
225 // preprocessing tasks, which essentially means updating i.e. controller
226 // table with new CC value in case of a controller event, because the
227 // script might access the new CC value
228 if (!event->executionSlices) {
229 switch (event->cause.Type) {
230 case Event::type_control_change:
231 pEngineChannel->ControllerTable[event->cause.Param.CC.Controller] =
232 event->cause.Param.CC.Value;
233 break;
234 case Event::type_channel_pressure:
235 pEngineChannel->ControllerTable[CTRL_TABLE_IDX_AFTERTOUCH] =
236 event->cause.Param.ChannelPressure.Value;
237 break;
238 case Event::type_pitchbend:
239 pEngineChannel->ControllerTable[CTRL_TABLE_IDX_PITCHBEND] =
240 event->cause.Param.Pitch.Pitch;
241 break;
242 }
243 }
244
245 // run the script handler(s)
246 VMExecStatus_t res = VM_EXEC_NOT_RUNNING;
247 for ( ; event->handlers[event->currentHandler]; event->currentHandler++) {
248 res = ScriptVM::exec(
249 parserCtx, event->execCtx, event->handlers[event->currentHandler]
250 );
251 event->executionSlices++;
252 if (res & VM_EXEC_SUSPENDED || res & VM_EXEC_ERROR) return res;
253 }
254
255 return res;
256 }
257
258 std::map<String,VMIntRelPtr*> InstrumentScriptVM::builtInIntVariables() {
259 // first get buil-in integer variables of derived VM class
260 std::map<String,VMIntRelPtr*> m = ScriptVM::builtInIntVariables();
261
262 // now add own built-in variables
263 m["$CC_NUM"] = &m_CC_NUM;
264 m["$EVENT_ID"] = &m_EVENT_ID;
265 m["$EVENT_NOTE"] = &m_EVENT_NOTE;
266 m["$EVENT_VELOCITY"] = &m_EVENT_VELOCITY;
267 // m["$POLY_AT_NUM"] = &m_POLY_AT_NUM;
268
269 return m;
270 }
271
272 std::map<String,VMInt8Array*> InstrumentScriptVM::builtInIntArrayVariables() {
273 // first get buil-in integer array variables of derived VM class
274 std::map<String,VMInt8Array*> m = ScriptVM::builtInIntArrayVariables();
275
276 // now add own built-in variables
277 m["%CC"] = &m_CC;
278 m["%KEY_DOWN"] = &m_KEY_DOWN;
279 //m["%POLY_AT"] = &m_POLY_AT;
280
281 return m;
282 }
283
284 std::map<String,int> InstrumentScriptVM::builtInConstIntVariables() {
285 // first get buil-in integer variables of derived VM class
286 std::map<String,int> m = ScriptVM::builtInConstIntVariables();
287
288 m["$VCC_MONO_AT"] = CTRL_TABLE_IDX_AFTERTOUCH;
289 m["$VCC_PITCH_BEND"] = CTRL_TABLE_IDX_PITCHBEND;
290 for (int i = 0; i < INSTR_SCRIPT_EVENT_GROUPS; ++i) {
291 m["$MARK_" + ToString(i+1)] = i;
292 }
293
294 return m;
295 }
296
297 VMFunction* InstrumentScriptVM::functionByName(const String& name) {
298 // built-in script functions of this class
299 if (name == "play_note") return &m_fnPlayNote;
300 else if (name == "set_controller") return &m_fnSetController;
301 else if (name == "ignore_event") return &m_fnIgnoreEvent;
302 else if (name == "ignore_controller") return &m_fnIgnoreController;
303 else if (name == "note_off") return &m_fnNoteOff;
304 else if (name == "set_event_mark") return &m_fnSetEventMark;
305 else if (name == "delete_event_mark") return &m_fnDeleteEventMark;
306 else if (name == "by_marks") return &m_fnByMarks;
307
308 // built-in script functions of derived VM class
309 return ScriptVM::functionByName(name);
310 }
311
312 } // namespace LinuxSampler

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