view pertrackaccumulator.h @ 596:6ad0a6e67d4c

Take advantage of those new handy _or_goto_error macros

Use them in various places where previously we either elided the error
checking (various lseek() calls) or used a combination of calls
(replaced by malloc_and_fill_or_goto_error()).

In the process, fix what is probably a bug (or else introduce one, but I
don't think so): audiodb_track_id_datum() computed the offset into the
timesTable wrongly, forgetting to multiply by 2.  (TODO: this should be
easily testable using the API).

Now all of LIBOBJS can be produced by my (Debian's) mingw32
cross-compiler, except for lshlib.o.

template <class T> class PerTrackAccumulator : public Accumulator {
public:
  PerTrackAccumulator(unsigned int pointNN, unsigned int trackNN);
  ~PerTrackAccumulator();
  void add_point(adb_result_t *r);
  adb_query_results_t *get_points();
private:
  unsigned int pointNN;
  unsigned int trackNN;
  std::map<adb_result_t, std::priority_queue< adb_result_t, std::vector<adb_result_t>, T > *, adb_result_key_lt> *queues;
  std::set< adb_result_t, adb_result_triple_lt > *set;
};

template <class T> PerTrackAccumulator<T>::PerTrackAccumulator(unsigned int pointNN, unsigned int trackNN)
  : pointNN(pointNN), trackNN(trackNN), queues(0), set(0) {
  queues = new std::map<adb_result_t, std::priority_queue< adb_result_t, std::vector<adb_result_t>, T > *, adb_result_key_lt>;
  set = new std::set< adb_result_t, adb_result_triple_lt >;
}

template <class T> PerTrackAccumulator<T>::~PerTrackAccumulator() {
  if(queues) {
    typename std::map< adb_result_t, std::priority_queue< adb_result_t, std::vector< adb_result_t >, T > *, adb_result_key_lt>::iterator it;
    for(it = queues->begin(); it != queues->end(); it++) {
      delete (*it).second;
    }
    delete queues;
  }
  if(set) {
    delete set;
  }
}

template <class T> void PerTrackAccumulator<T>::add_point(adb_result_t *r) {
  if(!isnan(r->dist)) {
    if(set->find(*r) == set->end()) {
      set->insert(*r);

      typename std::map< adb_result_t, std::priority_queue< adb_result_t, std::vector< adb_result_t >, T > *, adb_result_key_lt>::iterator it;
      std::priority_queue< adb_result_t, std::vector< adb_result_t >, T > *queue;
      it = queues->find(*r);
      if(it == queues->end()) {
        queue = new std::priority_queue< adb_result_t, std::vector< adb_result_t >, T >;
        (*queues)[*r] = queue;
      } else {
        queue = (*it).second;
      }

      queue->push(*r);
      if(queue->size() > pointNN) {
        queue->pop();
      }
    }
  }
}

template <class T> adb_query_results_t *PerTrackAccumulator<T>::get_points() {
  typename std::map< adb_result_t, std::vector< adb_result_t >, adb_result_key_lt> points;
  typename std::priority_queue< adb_result_t, std::vector< adb_result_t >, T> queue;
  typename std::map< adb_result_t, std::priority_queue< adb_result_t, std::vector< adb_result_t >, T > *, adb_result_key_lt>::iterator it;

  unsigned int size = 0;
  for(it = queues->begin(); it != queues->end(); it++) {
    unsigned int n = ((*it).second)->size();
    std::vector<adb_result_t> v;
    adb_result_t r;
    double dist = 0;
    for(unsigned int k = 0; k < n; k++) {
      r = ((*it).second)->top();
      dist += r.dist;
      v.push_back(r);
      ((*it).second)->pop();
    }
    points[r] = v;
    dist /= n;
    size += n;
    r.dist = dist;
    /* I will burn in hell */
    r.ipos = n;
    queue.push(r);
    if(queue.size() > trackNN) {
      size -= queue.top().ipos;
      queue.pop();
    }
  }

  adb_query_results_t *r = (adb_query_results_t *) malloc(sizeof(adb_query_results_t));
  adb_result_t *rs = (adb_result_t *) calloc(size, sizeof(adb_result_t));
  r->nresults = size;
  r->results = rs;
  
  unsigned int k = 0;
  while(queue.size() > 0) {
    std::vector<adb_result_t> v = points[queue.top()];
    queue.pop();
    while(v.size() > 0) {
      rs[k++] = v.back();
      v.pop_back();
    }
  }
  return r;
}