/[svn]/linuxsampler/trunk/src/engines/common/SampleManager.h
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revision 3491 by iliev, Fri Oct 23 17:53:17 2009 UTC revision 3492 by schoenebeck, Thu Mar 7 12:34:44 2019 UTC
# Line 32  Line 32 
32  namespace LinuxSampler {  namespace LinuxSampler {
33    
34      /**      /**
35       * Used to determine and manage the relations between samples and consumers (e.g. regions)       * Used to determine and manage the relations between samples and consumers
36         * (e.g. regions). Even though this class is currently stored at a shared
37         * source file location, this class is actually only used by the sfz engine
38         * ATM. So the gig and sf2 engines are not using this class at all.
39         *
40         * NOTE: This class currently uses a somewhat unclean design by maintaining
41         * a separate set of information of "consumers of a sample" vs. "consumers
42         * actually using a sample" (see bug #308). We might need to revise this
43         * design of this class in case new problems appear (e.g. when encountering
44         * memory leaks after closing an sfz instrument).
45       */       */
46      template <class S /* Sample */, class C /* Sample Consumer */>      template <class S /* Sample */, class C /* Sample Consumer */>
47      class SampleManager {      class SampleManager {
# Line 139  namespace LinuxSampler { Line 148  namespace LinuxSampler {
148                  verifyPair(pSample, pConsumer, "SampleManager::SetSampleNotInUse");                  verifyPair(pSample, pConsumer, "SampleManager::SetSampleNotInUse");
149    
150                  bool inUse = !samplesInUseMap[pSample].empty();                  bool inUse = !samplesInUseMap[pSample].empty();
151                  samplesInUseMap[pSample].erase(pConsumer);                  // Remove only one consumer at a time
152                    typename std::multiset<C*>::iterator it = samplesInUseMap[pSample].find(pConsumer);
153                    if (it != samplesInUseMap[pSample].end()) {
154                        samplesInUseMap[pSample].erase(it);
155                    }
156                  bool inUseNew = !samplesInUseMap[pSample].empty();                  bool inUseNew = !samplesInUseMap[pSample].empty();
157                    // Wih no consumers, erase sample
158                    if (!inUseNew) samplesInUseMap.erase(pSample);
159                  if(inUse && !inUseNew) OnSampleNotInUse(pSample);                  if(inUse && !inUseNew) OnSampleNotInUse(pSample);
160              }              }
161    
162          protected:          protected:
163              std::map<S*, std::set<C*> > sampleMap;              std::map<S*, std::set<C*> > sampleMap;
164              std::map<S*, std::set<C*> > samplesInUseMap;              std::map<S*, std::multiset<C*> > samplesInUseMap; // std::multiset as data type fixes bug #308.
165    
166              void verifyPair(S* pSample, C* pConsumer, String caller) {              void verifyPair(S* pSample, C* pConsumer, String caller) {
167                  if(!HasSample(pSample)) {                  if(!HasSample(pSample)) {
# Line 162  namespace LinuxSampler { Line 177  namespace LinuxSampler {
177               * Override this method to handle the state change (not in use -> in use)               * Override this method to handle the state change (not in use -> in use)
178               * of the specified sample.               * of the specified sample.
179               */               */
180              virtual void OnSampleInUse(S* pSample) { }              virtual void OnSampleInUse(S* pSample) = 0;
181    
182              /**              /**
183               * Override this method to handle the state change (in use -> not in use)               * Override this method to handle the state change (in use -> not in use)
184               * of the specified sample.               * of the specified sample.
185               */               */
186              virtual void OnSampleNotInUse(S* pSample) { }              virtual void OnSampleNotInUse(S* pSample) = 0;
187      };      };
188  } // namespace LinuxSampler  } // namespace LinuxSampler
189    
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