annotate query.cpp @ 473:b2fd8113d8bc api-inversion

const declarations for some API arguments.

This should make it slightly clearer whose responsibility (the user's)
it is to manage the memory pointed to by the corresponding arguments.
Suggested by Chris Cannam.

#include "audioDB.h"
#include "audioDB-internals.h"
#include "accumulators.h"

bool audiodb_powers_acceptable(const adb_query_refine_t *r, double p1, double p2) {
  if (r->flags & ADB_REFINE_ABSOLUTE_THRESHOLD) {
    if ((p1 < r->absolute_threshold) || (p2 < r->absolute_threshold)) {
      return false;
    }
  }
  if (r->flags & ADB_REFINE_RELATIVE_THRESHOLD) {
    if (fabs(p1-p2) > fabs(r->relative_threshold)) {
      return false;
    }
  }
  return true;
}

adb_query_results_t *audiodb_query_spec(adb_t *adb, const adb_query_spec_t *qspec) {
  adb_qstate_internal_t qstate = {0};
  qstate.allowed_keys = new std::set<std::string>;
  adb_query_results_t *results;
  if(qspec->refine.flags & ADB_REFINE_INCLUDE_KEYLIST) {
    for(unsigned int k = 0; k < qspec->refine.include.nkeys; k++) {
      qstate.allowed_keys->insert(qspec->refine.include.keys[k]);
    }
  } else {
    for(unsigned int k = 0; k < adb->header->numFiles; k++) {
      qstate.allowed_keys->insert((*adb->keys)[k]);
    }
  }
  if(qspec->refine.flags & ADB_REFINE_EXCLUDE_KEYLIST) {
    for(unsigned int k = 0; k < qspec->refine.exclude.nkeys; k++) {
      qstate.allowed_keys->erase(qspec->refine.exclude.keys[k]);
    }
  }

  switch(qspec->params.distance) {
  case ADB_DISTANCE_DOT_PRODUCT:
    switch(qspec->params.accumulation) {
    case ADB_ACCUMULATION_DB:
      qstate.accumulator = new DBAccumulator<adb_result_dist_gt>(qspec->params.npoints);
      break;
    case ADB_ACCUMULATION_PER_TRACK:
      qstate.accumulator = new PerTrackAccumulator<adb_result_dist_gt>(qspec->params.npoints, qspec->params.ntracks);
      break;
    case ADB_ACCUMULATION_ONE_TO_ONE:
      qstate.accumulator = new NearestAccumulator<adb_result_dist_gt>();
      break;
    default:
      goto error;
    }
    break;
  case ADB_DISTANCE_EUCLIDEAN_NORMED:
  case ADB_DISTANCE_EUCLIDEAN:
    switch(qspec->params.accumulation) {
    case ADB_ACCUMULATION_DB:
      qstate.accumulator = new DBAccumulator<adb_result_dist_lt>(qspec->params.npoints);
      break;
    case ADB_ACCUMULATION_PER_TRACK:
      qstate.accumulator = new PerTrackAccumulator<adb_result_dist_lt>(qspec->params.npoints, qspec->params.ntracks);
      break;
    case ADB_ACCUMULATION_ONE_TO_ONE:
      qstate.accumulator = new NearestAccumulator<adb_result_dist_lt>();
      break;
    default:
      goto error;
    }
    break;
  default:
    goto error;
  }
  
  if((qspec->refine.flags & ADB_REFINE_RADIUS) && audiodb_index_exists(adb->path, qspec->refine.radius, qspec->qid.sequence_length)) {
    if(audiodb_index_query_loop(adb, qspec, &qstate) < 0) {
      goto error;
    }
  } else {
    if(audiodb_query_loop(adb, qspec, &qstate)) {
      goto error;
    }
  }

  results = qstate.accumulator->get_points();

  delete qstate.accumulator;
  delete qstate.allowed_keys;

  return results;

 error:
  if(qstate.accumulator)
    delete qstate.accumulator;
  if(qstate.allowed_keys)
    delete qstate.allowed_keys;
  return NULL;
}

int audiodb_query_free_results(adb_t *adb, const adb_query_spec_t *spec, adb_query_results_t *rs) {
  free(rs->results);
  free(rs);
  return 0;
}

static void audiodb_initialize_arrays(adb_t *adb, const adb_query_spec_t *spec, int track, unsigned int numVectors, double *query, double *data_buffer, double **D, double **DD) {
  unsigned int j, k, l, w;
  double *dp, *qp, *sp;

  const unsigned HOP_SIZE = spec->refine.hopsize;
  const unsigned wL = spec->qid.sequence_length;

  for(j = 0; j < numVectors; j++) {
    // Sum products matrix
    D[j] = new double[(*adb->track_lengths)[track]]; 
    assert(D[j]);
    // Matched filter matrix
    DD[j]=new double[(*adb->track_lengths)[track]];
    assert(DD[j]);
  }

  // Dot product
  for(j = 0; j < numVectors; j++)
    for(k = 0; k < (*adb->track_lengths)[track]; k++){
      qp = query + j * adb->header->dim;
      sp = data_buffer + k * adb->header->dim;
      DD[j][k] = 0.0; // Initialize matched filter array
      dp = &D[j][k];  // point to correlation cell j,k
      *dp = 0.0;      // initialize correlation cell
      l = adb->header->dim;         // size of vectors
      while(l--)
        *dp += *qp++ * *sp++;
    }
  
  // Matched Filter
  // HOP SIZE == 1
  double* spd;
  if(HOP_SIZE == 1) { // HOP_SIZE = shingleHop
    for(w = 0; w < wL; w++) {
      for(j = 0; j < numVectors - w; j++) { 
        sp = DD[j];
        spd = D[j+w] + w;
        k = (*adb->track_lengths)[track] - w;
	while(k--)
	  *sp++ += *spd++;
      }
    }
  } else { // HOP_SIZE != 1
    for(w = 0; w < wL; w++) {
      for(j = 0; j < numVectors - w; j += HOP_SIZE) {
        sp = DD[j];
        spd = D[j+w]+w;
        for(k = 0; k < (*adb->track_lengths)[track] - w; k += HOP_SIZE) {
          *sp += *spd;
          sp += HOP_SIZE;
          spd += HOP_SIZE;
        }
      }
    }
  }
}

static void audiodb_delete_arrays(int track, unsigned int numVectors, double **D, double **DD) {
  if(D != NULL) {
    for(unsigned int j = 0; j < numVectors; j++) {
      delete[] D[j];
    }
  }
  if(DD != NULL) {
    for(unsigned int j = 0; j < numVectors; j++) {
      delete[] DD[j];
    }
  }
}

int audiodb_read_data(adb_t *adb, int trkfid, int track, double **data_buffer_p, size_t *data_buffer_size_p) {
  uint32_t track_length = (*adb->track_lengths)[track];
  size_t track_size = track_length * sizeof(double) * adb->header->dim;
  if (track_size > *data_buffer_size_p) {
    if(*data_buffer_p) {
      free(*data_buffer_p);
    }
    { 
      *data_buffer_size_p = track_size;
      void *tmp = malloc(track_size);
      if (tmp == NULL) {
        goto error;
      }
      *data_buffer_p = (double *) tmp;
    }
  }

  read_or_goto_error(trkfid, *data_buffer_p, track_size);
  return 0;

 error:
  return 1;
}

int audiodb_track_id_datum(adb_t *adb, uint32_t track_id, adb_datum_t *d) {
  off_t track_offset = (*adb->track_offsets)[track_id];
  if(adb->header->flags & O2_FLAG_LARGE_ADB) {
    /* create a reference/insert, then use adb_insert_create_datum() */
    adb_reference_t reference = {0};
    char features[MAXSTR], power[MAXSTR], times[MAXSTR];
    lseek(adb->fd, adb->header->dataOffset + track_id * O2_FILETABLE_ENTRY_SIZE, SEEK_SET);
    read_or_goto_error(adb->fd, features, MAXSTR);
    reference.features = features;
    if(adb->header->flags & O2_FLAG_POWER) {
      lseek(adb->fd, adb->header->powerTableOffset + track_id * O2_FILETABLE_ENTRY_SIZE, SEEK_SET);
      read_or_goto_error(adb->fd, power, MAXSTR);
      reference.power = power;
    }
    if(adb->header->flags & O2_FLAG_TIMES) {
      lseek(adb->fd, adb->header->timesTableOffset + track_id * O2_FILETABLE_ENTRY_SIZE, SEEK_SET);
      read_or_goto_error(adb->fd, times, MAXSTR);
      reference.times = times;
    }
    return audiodb_insert_create_datum(&reference, d);
  } else {
    /* initialize from sources of data that we already have */
    d->nvectors = (*adb->track_lengths)[track_id];
    d->dim = adb->header->dim;
    d->key = (*adb->keys)[track_id].c_str();
    /* read out stuff from the database tables */
    d->data = (double *) malloc(d->nvectors * d->dim * sizeof(double));
    lseek(adb->fd, adb->header->dataOffset + track_offset, SEEK_SET);
    read_or_goto_error(adb->fd, d->data, d->nvectors * d->dim * sizeof(double));
    if(adb->header->flags & O2_FLAG_POWER) {
      d->power = (double *) malloc(d->nvectors * sizeof(double));
      lseek(adb->fd, adb->header->powerTableOffset + track_offset / d->dim, SEEK_SET);
      read_or_goto_error(adb->fd, d->power, d->nvectors * sizeof(double));
    }
    if(adb->header->flags & O2_FLAG_TIMES) {
      d->times = (double *) malloc(2 * d->nvectors * sizeof(double));
      lseek(adb->fd, adb->header->timesTableOffset + track_offset / d->dim, SEEK_SET);
      read_or_goto_error(adb->fd, d->times, 2 * d->nvectors * sizeof(double));
    }
    return 0;
  }
 error:
  audiodb_free_datum(d);
  return 1;
}

int audiodb_datum_qpointers(adb_datum_t *d, uint32_t sequence_length, double **vector_data, double **vector, adb_qpointers_internal_t *qpointers) {
  uint32_t nvectors = d->nvectors;

  qpointers->nvectors = nvectors;

  size_t vector_size = nvectors * sizeof(double) * d->dim;
  *vector_data = new double[vector_size];
  memcpy(*vector_data, d->data, vector_size);

  qpointers->l2norm_data = new double[vector_size / d->dim];
  audiodb_l2norm_buffer(*vector_data, d->dim, nvectors, qpointers->l2norm_data);
  audiodb_sequence_sum(qpointers->l2norm_data, nvectors, sequence_length);
  audiodb_sequence_sqrt(qpointers->l2norm_data, nvectors, sequence_length);

  if(d->power) {
    qpointers->power_data = new double[vector_size / d->dim];
    memcpy(qpointers->power_data, d->power, vector_size / d->dim);
    audiodb_sequence_sum(qpointers->power_data, nvectors, sequence_length);
    audiodb_sequence_average(qpointers->power_data, nvectors, sequence_length);
  }

  if(d->times) {
    qpointers->mean_duration = new double[1];
    *qpointers->mean_duration = 0;
    for(unsigned int k = 0; k < nvectors; k++) {
      *qpointers->mean_duration += d->times[2*k+1] - d->times[2*k];
    }
    *qpointers->mean_duration /= nvectors;
  }

  *vector = *vector_data;
  qpointers->l2norm = qpointers->l2norm_data;
  qpointers->power = qpointers->power_data;
  return 0;
}

int audiodb_query_spec_qpointers(adb_t *adb, const adb_query_spec_t *spec, double **vector_data, double **vector, adb_qpointers_internal_t *qpointers) {
  adb_datum_t *datum;
  adb_datum_t d = {0};
  uint32_t sequence_length;
  uint32_t sequence_start;

  datum = spec->qid.datum;
  sequence_length = spec->qid.sequence_length;
  sequence_start = spec->qid.sequence_start;
    
  if(datum->data) {
    if(datum->dim != adb->header->dim) {
      return 1;
    }
    /* initialize d, and mark that nothing needs freeing later. */
    d = *datum;
    datum = &d;
  } else if (datum->key) {
    uint32_t track_id;
    if((track_id = audiodb_key_index(adb, datum->key)) == (uint32_t) -1) {
      return 1;
    }
    audiodb_track_id_datum(adb, track_id, &d);
  } else {
    return 1;
  }

  /* FIXME: check the overflow logic here */
  if(sequence_start + sequence_length > d.nvectors) {
    if(datum != &d) {
      audiodb_free_datum(&d);
    }
    return 1;
  }

  audiodb_datum_qpointers(&d, sequence_length, vector_data, vector, qpointers);

  /* Finally, if applicable, set up the moving qpointers. */
  if(spec->qid.flags & ADB_QID_FLAG_EXHAUSTIVE) {
    /* the qpointers are already at the start, and so correct. */
  } else {
    /* adjust the qpointers to point to the correct place in the sequence */
    *vector = *vector_data + spec->qid.sequence_start * d.dim;
    qpointers->l2norm = qpointers->l2norm_data + spec->qid.sequence_start;
    if(d.power) {
      qpointers->power = qpointers->power_data + spec->qid.sequence_start;
    }
    qpointers->nvectors = sequence_length;
  }

  /* Clean up: free any bits of datum that we have ourselves
   * allocated. */
  if(datum != &d) {
    audiodb_free_datum(&d);
  }

  return 0;
}

static int audiodb_set_up_dbpointers(adb_t *adb, const adb_query_spec_t *spec, adb_qpointers_internal_t *dbpointers) {
  uint32_t nvectors = adb->header->length / (adb->header->dim * sizeof(double));
  uint32_t sequence_length = spec->qid.sequence_length;

  bool using_power = spec->refine.flags & (ADB_REFINE_ABSOLUTE_THRESHOLD|ADB_REFINE_RELATIVE_THRESHOLD);
  bool using_times = spec->refine.flags & ADB_REFINE_DURATION_RATIO;
  double *times_table = NULL;


  dbpointers->nvectors = nvectors;
  dbpointers->l2norm_data = new double[nvectors];

  double *snpp = dbpointers->l2norm_data, *sppp = 0;
  lseek(adb->fd, adb->header->l2normTableOffset, SEEK_SET);
  read_or_goto_error(adb->fd, dbpointers->l2norm_data, nvectors * sizeof(double));

  if (using_power) {
    if (!(adb->header->flags & O2_FLAG_POWER)) {
      goto error;
    }
    dbpointers->power_data = new double[nvectors];
    sppp = dbpointers->power_data;
    lseek(adb->fd, adb->header->powerTableOffset, SEEK_SET);
    read_or_goto_error(adb->fd, dbpointers->power_data, nvectors * sizeof(double));
  }

  for(unsigned int i = 0; i < adb->header->numFiles; i++){
    size_t track_length = (*adb->track_lengths)[i];
    if(track_length >= sequence_length) {
      audiodb_sequence_sum(snpp, track_length, sequence_length);
      audiodb_sequence_sqrt(snpp, track_length, sequence_length);
      if (using_power) {
	audiodb_sequence_sum(sppp, track_length, sequence_length);
        audiodb_sequence_average(sppp, track_length, sequence_length);
      }
    }
    snpp += track_length;
    if (using_power) {
      sppp += track_length;
    }
  }

  if (using_times) {
    if(!(adb->header->flags & O2_FLAG_TIMES)) {
      goto error;
    }

    dbpointers->mean_duration = new double[adb->header->numFiles];

    times_table = (double *) malloc(2 * nvectors * sizeof(double));
    if(!times_table) {
      goto error;
    }
    lseek(adb->fd, adb->header->timesTableOffset, SEEK_SET);
    read_or_goto_error(adb->fd, times_table, 2 * nvectors * sizeof(double));
    for(unsigned int k = 0; k < adb->header->numFiles; k++) {
      size_t track_length = (*adb->track_lengths)[k];
      unsigned int j;
      dbpointers->mean_duration[k] = 0.0;
      for(j = 0; j < track_length; j++) {
	dbpointers->mean_duration[k] += times_table[2*j+1] - times_table[2*j];
      }
      dbpointers->mean_duration[k] /= j;
    }

    free(times_table);
    times_table = NULL;
  }

  dbpointers->l2norm = dbpointers->l2norm_data;
  dbpointers->power = dbpointers->power_data;
  return 0;

 error:
  if(dbpointers->l2norm_data) {
    delete [] dbpointers->l2norm_data;
  }
  if(dbpointers->power_data) {
    delete [] dbpointers->power_data;
  }
  if(dbpointers->mean_duration) {
    delete [] dbpointers->mean_duration;
  }
  if(times_table) {
    free(times_table);
  }
  return 1;
  
}

int audiodb_query_queue_loop(adb_t *adb, const adb_query_spec_t *spec, adb_qstate_internal_t *qstate, double *query, adb_qpointers_internal_t *qpointers) {
  adb_qpointers_internal_t dbpointers = {0};

  uint32_t sequence_length = spec->qid.sequence_length;
  bool power_refine = spec->refine.flags & (ADB_REFINE_ABSOLUTE_THRESHOLD|ADB_REFINE_RELATIVE_THRESHOLD);

  if(qstate->exact_evaluation_queue->size() == 0) {
    return 0;
  }

  /* We are guaranteed that the order of points is sorted by:
   * {trackID, spos, qpos} so we can be relatively efficient in
   * initialization of track data.  We assume that points usually
   * don't overlap, so we will use exhaustive dot product evaluation
   * (instead of memoization of partial sums, as in query_loop()).
   */
  double dist;
  double *dbdata = 0, *dbdata_pointer;
  Uns32T currentTrack = 0x80000000; // KLUDGE: Initialize with a value outside of track index range
  Uns32T npairs = qstate->exact_evaluation_queue->size();
  while(npairs--) {
    PointPair pp = qstate->exact_evaluation_queue->top();
    if(currentTrack != pp.trackID) {
      SAFE_DELETE_ARRAY(dbdata);
      SAFE_DELETE_ARRAY(dbpointers.l2norm_data);
      SAFE_DELETE_ARRAY(dbpointers.power_data);
      SAFE_DELETE_ARRAY(dbpointers.mean_duration);
      currentTrack = pp.trackID;
      adb_datum_t d = {0};
      if(audiodb_track_id_datum(adb, pp.trackID, &d)) {
        delete qstate->exact_evaluation_queue;
        return 1;
      }
      if(audiodb_datum_qpointers(&d, sequence_length, &dbdata, &dbdata_pointer, &dbpointers)) {
        delete qstate->exact_evaluation_queue;
        audiodb_free_datum(&d);
        return 1;
      }
      audiodb_free_datum(&d);
    }
    Uns32T qPos = (spec->qid.flags & ADB_QID_FLAG_EXHAUSTIVE) ? pp.qpos : 0;
    Uns32T sPos = pp.spos; // index into l2norm table
    // Test power thresholds before computing distance
    if( ( (!power_refine) || audiodb_powers_acceptable(&spec->refine, qpointers->power[qPos], dbpointers.power[sPos])) &&
	( qPos<qpointers->nvectors-sequence_length+1 && sPos<(*adb->track_lengths)[pp.trackID]-sequence_length+1 ) ){
      // Compute distance
      dist = audiodb_dot_product(query + qPos*adb->header->dim, dbdata + sPos*adb->header->dim, adb->header->dim*sequence_length);
      double qn = qpointers->l2norm[qPos];
      double sn = dbpointers.l2norm[sPos];
      switch(spec->params.distance) {
      case ADB_DISTANCE_EUCLIDEAN_NORMED:
	dist = 2 - (2/(qn*sn))*dist;
        break;
      case ADB_DISTANCE_EUCLIDEAN:
        dist = qn*qn + sn*sn - 2*dist;
        break;
      }
      if((!(spec->refine.flags & ADB_REFINE_RADIUS)) || 
         dist <= (spec->refine.radius+O2_DISTANCE_TOLERANCE)) {
        adb_result_t r;
        r.key = (*adb->keys)[pp.trackID].c_str();
        r.dist = dist;
        r.qpos = pp.qpos;
        r.ipos = pp.spos;
        qstate->accumulator->add_point(&r);
      }
    }
    qstate->exact_evaluation_queue->pop();
  }
  // Cleanup
  SAFE_DELETE_ARRAY(dbdata);
  SAFE_DELETE_ARRAY(dbpointers.l2norm_data);
  SAFE_DELETE_ARRAY(dbpointers.power_data);
  SAFE_DELETE_ARRAY(dbpointers.mean_duration);
  delete qstate->exact_evaluation_queue;
  return 0;
}

int audiodb_query_loop(adb_t *adb, const adb_query_spec_t *spec, adb_qstate_internal_t *qstate) {
  
  double *query, *query_data;
  adb_qpointers_internal_t qpointers = {0}, dbpointers = {0};

  bool power_refine = spec->refine.flags & (ADB_REFINE_ABSOLUTE_THRESHOLD|ADB_REFINE_RELATIVE_THRESHOLD);

  if(adb->header->flags & O2_FLAG_LARGE_ADB) {
    /* FIXME: actually it would be nice to support this mode of
     * operation, but for now... */
    return 1;
  }

  if(audiodb_query_spec_qpointers(adb, spec, &query_data, &query, &qpointers)) {
    return 1;
  }

  if(audiodb_set_up_dbpointers(adb, spec, &dbpointers)) {
    return 1;
  }

  unsigned j,k,track,trackOffset=0, HOP_SIZE = spec->refine.hopsize;
  unsigned wL = spec->qid.sequence_length;
  double **D = 0;    // Differences query and target 
  double **DD = 0;   // Matched filter distance

  D = new double*[qpointers.nvectors]; // pre-allocate 
  DD = new double*[qpointers.nvectors];

  off_t trackIndexOffset;

  // Track loop 
  size_t data_buffer_size = 0;
  double *data_buffer = 0;
  lseek(adb->fd, adb->header->dataOffset, SEEK_SET);

  std::set<std::string>::iterator keys_end = qstate->allowed_keys->end();
  for(track = 0; track < adb->header->numFiles; track++) {
    unsigned t = track;
    
    while (qstate->allowed_keys->find((*adb->keys)[track]) == keys_end) {
      track++;
      if(track == adb->header->numFiles) {
        goto loop_finish;
      }
    }
    trackOffset = (*adb->track_offsets)[track];
    if(track != t) {
      lseek(adb->fd, adb->header->dataOffset + trackOffset, SEEK_SET);
    }
    trackIndexOffset = trackOffset / (adb->header->dim * sizeof(double)); // dbpointers.nvectors offset

    if(audiodb_read_data(adb, adb->fd, track, &data_buffer, &data_buffer_size)) {
      return 1;
    }
    if(wL <= (*adb->track_lengths)[track]) {  // test for short sequences
      
      audiodb_initialize_arrays(adb, spec, track, qpointers.nvectors, query, data_buffer, D, DD);

      if((!(spec->refine.flags & ADB_REFINE_DURATION_RATIO)) || 
         fabs(dbpointers.mean_duration[track]-qpointers.mean_duration[0]) < qpointers.mean_duration[0]*spec->refine.duration_ratio) {

	// Search for minimum distance by shingles (concatenated vectors)
	for(j = 0; j <= qpointers.nvectors - wL; j += HOP_SIZE) {
	  for(k = 0; k <= (*adb->track_lengths)[track] - wL; k += HOP_SIZE) {
            double thisDist = 0;
            double qn = qpointers.l2norm[j];
            double sn = dbpointers.l2norm[trackIndexOffset + k];
            switch(spec->params.distance) {
            case ADB_DISTANCE_EUCLIDEAN_NORMED:
              thisDist = 2-(2/(qn*sn))*DD[j][k];
              break;
            case ADB_DISTANCE_EUCLIDEAN:
              thisDist = qn*qn + sn*sn - 2*DD[j][k];
              break;
            case ADB_DISTANCE_DOT_PRODUCT:
              thisDist = DD[j][k];
              break;
            }
	    // Power test
	    if ((!power_refine) || audiodb_powers_acceptable(&spec->refine, qpointers.power[j], dbpointers.power[trackIndexOffset + k])) {
              // radius test
              if((!(spec->refine.flags & ADB_REFINE_RADIUS)) || 
                 thisDist <= (spec->refine.radius+O2_DISTANCE_TOLERANCE)) {
                adb_result_t r;
                r.key = (*adb->keys)[track].c_str();
                r.dist = thisDist;
                if(spec->qid.flags & ADB_QID_FLAG_EXHAUSTIVE) {
                  r.qpos = j;
                } else {
                  r.qpos = spec->qid.sequence_start;
                }
                r.ipos = k;
                qstate->accumulator->add_point(&r);
              }
            }
          }
        }
      } // Duration match            
      audiodb_delete_arrays(track, qpointers.nvectors, D, DD);
    }
  }

 loop_finish:

  free(data_buffer);

  // Clean up
  if(query_data)
    delete[] query_data;
  if(qpointers.l2norm_data)
    delete[] qpointers.l2norm_data;
  if(qpointers.power_data)
    delete[] qpointers.power_data;
  if(qpointers.mean_duration)
    delete[] qpointers.mean_duration;
  if(dbpointers.power_data)
    delete[] dbpointers.power_data;
  if(dbpointers.l2norm_data)
    delete[] dbpointers.l2norm_data;
  if(D)
    delete[] D;
  if(DD)
    delete[] DD;
  if(dbpointers.mean_duration)
    delete[] dbpointers.mean_duration;

  return 0;
}