measurement_buffer.cpp

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 * Author: Steve Macenski (steven.macenski@simberobotics.com)
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#include <spatio_temporal_voxel_layer/measurement_buffer.hpp>
#include <tf2_geometry_msgs/tf2_geometry_msgs.h>
#include <tf2_sensor_msgs/tf2_sensor_msgs.h>
 
namespace buffer
{
 
/*****************************************************************************/
MeasurementBuffer::MeasurementBuffer(const std::string& topic_name,          \
                                     const double& observation_keep_time,    \
                                     const double& expected_update_rate,     \
                                     const double& min_obstacle_height,      \
                                     const double& max_obstacle_height,      \
                                     const double& obstacle_range,           \
                                     tf2_ros::Buffer& tf,                    \
                                     const std::string& global_frame,        \
                                     const std::string& sensor_frame,        \
                                     const double& tf_tolerance,             \
                                     const double& min_d,                    \
                                     const double& max_d,                    \
                                     const double& vFOV,                     \
                                     const double& vFOVPadding,              \
                                     const double& hFOV,                     \
                                     const double& decay_acceleration,       \
                                     const bool& marking,                    \
                                     const bool& clearing,                   \
                                     const double& voxel_size,               \
                                     const Filters& filter,                  \
                                     const int& voxel_min_points,            \
                                     const bool& enabled,                    \
                                     const bool& clear_buffer_after_reading, \
                                     const ModelType& model_type) :
/*****************************************************************************/
    _buffer(tf), _observation_keep_time(observation_keep_time),
    _expected_update_rate(expected_update_rate),_last_updated(ros::Time::now()), 
    _global_frame(global_frame), _sensor_frame(sensor_frame),
    _topic_name(topic_name), _min_obstacle_height(min_obstacle_height), 
    _max_obstacle_height(max_obstacle_height), _obstacle_range(obstacle_range),
    _tf_tolerance(tf_tolerance), _min_z(min_d), _max_z(max_d), 
    _vertical_fov(vFOV), _vertical_fov_padding(vFOVPadding),
    _horizontal_fov(hFOV), _decay_acceleration(decay_acceleration),
    _marking(marking), _clearing(clearing), _voxel_size(voxel_size),
    _filter(filter), _voxel_min_points(voxel_min_points),
    _enabled(enabled), _clear_buffer_after_reading(clear_buffer_after_reading),
    _model_type(model_type)
{
}
 
/*****************************************************************************/
MeasurementBuffer::~MeasurementBuffer(void)
/*****************************************************************************/
{
}
 
/*****************************************************************************/
void MeasurementBuffer::BufferROSCloud(const sensor_msgs::PointCloud2& cloud)
/*****************************************************************************/
{
  // add a new measurement to be populated
  _observation_list.push_front(observation::MeasurementReading());
 
  const std::string origin_frame = \
                  _sensor_frame == "" ? cloud.header.frame_id : _sensor_frame;
 
  try
  {
    // transform into global frame
    geometry_msgs::PoseStamped  local_pose, global_pose;
    local_pose.pose.position.x=0;
    local_pose.pose.position.y=0;
    local_pose.pose.position.z=0;
    local_pose.pose.orientation.x=0;
    local_pose.pose.orientation.y=0;
    local_pose.pose.orientation.z=0;
    local_pose.pose.orientation.w=1;
    local_pose.header.stamp = cloud.header.stamp;
    local_pose.header.frame_id = origin_frame;
 
    _buffer.canTransform(_global_frame, local_pose.header.frame_id , \
                         local_pose.header.stamp, ros::Duration(0.5));
    _buffer.transform(local_pose, global_pose, _global_frame);
 
    _observation_list.front()._origin.x = global_pose.pose.position.x;
    _observation_list.front()._origin.y = global_pose.pose.position.y;
    _observation_list.front()._origin.z = global_pose.pose.position.z;
 
    _observation_list.front()._orientation = global_pose.pose.orientation;
    _observation_list.front()._obstacle_range_in_m = _obstacle_range;
    _observation_list.front()._min_z_in_m = _min_z;
    _observation_list.front()._max_z_in_m = _max_z;
    _observation_list.front()._vertical_fov_in_rad = _vertical_fov;
    _observation_list.front()._vertical_fov_padding_in_m = _vertical_fov_padding;
    _observation_list.front()._horizontal_fov_in_rad = _horizontal_fov;
    _observation_list.front()._decay_acceleration = _decay_acceleration;
    _observation_list.front()._clearing = _clearing;
    _observation_list.front()._marking = _marking;
    _observation_list.front()._model_type = _model_type;
 
    if (_clearing && !_marking)
    {
      // no need to buffer points
      return;
    }
 
    // transform the cloud in the global frame
    point_cloud_ptr cld_global(new sensor_msgs::PointCloud2());
    geometry_msgs::TransformStamped tf_stamped = _buffer.lookupTransform( \
                 _global_frame, cloud.header.frame_id, cloud.header.stamp);
    tf2::doTransform (cloud, *cld_global, tf_stamped);
 
    pcl::PCLPointCloud2::Ptr cloud_pcl (new pcl::PCLPointCloud2 ());
    pcl::PCLPointCloud2::Ptr cloud_filtered (new pcl::PCLPointCloud2 ());
 
    // remove points that are below or above our height restrictions, and
    // in the same time, remove NaNs and if user wants to use it, combine with a
    if (_filter == Filters::VOXEL)
    {
      pcl_conversions::toPCL(*cld_global, *cloud_pcl);
      pcl::VoxelGrid<pcl::PCLPointCloud2> sor;
      sor.setInputCloud (cloud_pcl);
      sor.setFilterFieldName("z");
      sor.setFilterLimits(_min_obstacle_height,_max_obstacle_height);
      sor.setDownsampleAllData(false);
      sor.setLeafSize ((float)_voxel_size,
                       (float)_voxel_size,
                       (float)_voxel_size);
      sor.setMinimumPointsNumberPerVoxel(static_cast<unsigned int>(_voxel_min_points));
      sor.filter(*cloud_filtered);
      pcl_conversions::fromPCL(*cloud_filtered, *cld_global);
    }
    else if (_filter == Filters::PASSTHROUGH)
    {
      pcl_conversions::toPCL(*cld_global, *cloud_pcl);
      pcl::PassThrough<pcl::PCLPointCloud2> pass_through_filter;
      pass_through_filter.setInputCloud(cloud_pcl);
      pass_through_filter.setKeepOrganized(false);
      pass_through_filter.setFilterFieldName("z");
      pass_through_filter.setFilterLimits( \
                  _min_obstacle_height,_max_obstacle_height);
      pass_through_filter.filter(*cloud_filtered);
      pcl_conversions::fromPCL(*cloud_filtered, *cld_global);
    }
 
    _observation_list.front()._cloud = cld_global;
  }
  catch (tf::TransformException& ex)
  {
    // if fails, remove the empty observation
    _observation_list.pop_front();
    ROS_ERROR( \
      "TF Exception for sensor frame: %s, cloud frame: %s, %s", \
      _sensor_frame.c_str(), cloud.header.frame_id.c_str(), ex.what());
    return;
  }
 
  _last_updated = ros::Time::now();
  RemoveStaleObservations();
}
 
/*****************************************************************************/
void MeasurementBuffer::GetReadings( \
                    std::vector<observation::MeasurementReading>& observations)
/*****************************************************************************/
{
  RemoveStaleObservations();
 
  for (readings_iter it = _observation_list.begin(); \
                                          it != _observation_list.end(); ++it)
  {
    observations.push_back(*it);
  }
}
 
/*****************************************************************************/
void MeasurementBuffer::RemoveStaleObservations(void)
/*****************************************************************************/
{
  if (_observation_list.empty())
  {
    return;
  }
 
  readings_iter it = _observation_list.begin();
  if (_observation_keep_time == ros::Duration(0.0))
  {
    _observation_list.erase(++it, _observation_list.end());
    return;
  }
 
  for (it = _observation_list.begin(); it != _observation_list.end(); ++it)
  {
    observation::MeasurementReading& obs = *it;
    const ros::Duration time_diff = _last_updated - obs._cloud->header.stamp;
 
    if (time_diff > _observation_keep_time)
    {
      _observation_list.erase(it, _observation_list.end());
      return;
    }
  }
}
 
/*****************************************************************************/
void MeasurementBuffer::ResetAllMeasurements(void)
/*****************************************************************************/
{
  _observation_list.clear();
}
 
/*****************************************************************************/
bool MeasurementBuffer::ClearAfterReading(void)
/*****************************************************************************/
{
  return _clear_buffer_after_reading;
}
 
/*****************************************************************************/
bool MeasurementBuffer::UpdatedAtExpectedRate(void) const
/*****************************************************************************/
{
  if (_expected_update_rate == ros::Duration(0.0))
  {
    return true;
  }
 
  const ros::Duration update_time = ros::Time::now() - _last_updated;
  const bool current = update_time.toSec() <= _expected_update_rate.toSec();
  if (!current)
  {
    ROS_WARN_THROTTLE(10.,
      "%s buffer updated in %.2fs, it should be updated every %.2fs.",
      _topic_name.c_str(), update_time.toSec(), _expected_update_rate.toSec());
  }
  return current;
}
 
/*****************************************************************************/
bool MeasurementBuffer::IsEnabled(void) const
/*****************************************************************************/
{
  return _enabled;
}
 
/*****************************************************************************/
void MeasurementBuffer::SetEnabled(const bool& enabled)
/*****************************************************************************/
{
  _enabled = enabled;
}
 
/*****************************************************************************/
void MeasurementBuffer::ResetLastUpdatedTime(void)
/*****************************************************************************/
{
  _last_updated = ros::Time::now();
}
 
/*****************************************************************************/
void MeasurementBuffer::Lock(void)
/*****************************************************************************/
{
  _lock.lock();
}
 
/*****************************************************************************/
void MeasurementBuffer::Unlock(void)
/*****************************************************************************/
{
  _lock.unlock();
}
 
}  // namespace buffer