concatenate_fields.cpp

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 * $Id: concatenate_fields.cpp 35052 2011-01-03 21:04:57Z rusu $
 *
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#include <pluginlib/class_list_macros.h>
#include <pcl/io/io.h>
#include "pcl_ros/io/concatenate_fields.h"

void
pcl_ros::PointCloudConcatenateFieldsSynchronizer::onInit ()
{
  private_nh_ = getMTPrivateNodeHandle ();
  // ---[ Mandatory parameters
  if (!private_nh_.getParam ("input_messages", input_messages_))
  {
    NODELET_ERROR ("[onInit] Need a 'input_messages' parameter to be set before continuing!");
    return;
  }
  if (input_messages_ < 2)
  {
    NODELET_ERROR ("[onInit] Invalid 'input_messages' parameter given!");
    return;
  }
  // ---[ Optional parameters
  private_nh_.getParam ("max_queue_size", maximum_queue_size_);
  private_nh_.getParam ("maximum_seconds", maximum_seconds_);
  sub_input_ = private_nh_.subscribe ("input", maximum_queue_size_,  &PointCloudConcatenateFieldsSynchronizer::input_callback, this);
  pub_output_ = private_nh_.advertise<sensor_msgs::PointCloud2> ("output", maximum_queue_size_);
}

void
pcl_ros::PointCloudConcatenateFieldsSynchronizer::input_callback (const PointCloudConstPtr &cloud)
{
  NODELET_DEBUG ("[input_callback] PointCloud with %d data points (%s), stamp %f, and frame %s on topic %s received.",
                 cloud->width * cloud->height, pcl::getFieldsList (*cloud).c_str (), cloud->header.stamp.toSec (), cloud->header.frame_id.c_str (), private_nh_.resolveName ("input").c_str ());

  // Erase old data in the queue
  if (maximum_seconds_ > 0 && queue_.size () > 0)
  {
    while (fabs ( ( (*queue_.begin ()).first - cloud->header.stamp).toSec () ) > maximum_seconds_ && queue_.size () > 0)
    {
      NODELET_WARN ("[input_callback] Maximum seconds limit (%f) reached. Difference is %f, erasing message in queue with stamp %f.", maximum_seconds_,
                 (*queue_.begin ()).first.toSec (), fabs ( ( (*queue_.begin ()).first - cloud->header.stamp).toSec () ));
      queue_.erase (queue_.begin ());
    }
  }

  // Push back new data
  queue_[cloud->header.stamp].push_back (cloud);
  if ((int)queue_[cloud->header.stamp].size () >= input_messages_)
  {
    // Concatenate together and publish
    std::vector<PointCloudConstPtr> &clouds = queue_[cloud->header.stamp];
    PointCloud cloud_out = *clouds[0];

    // Resize the output dataset
    int data_size = cloud_out.data.size ();
    int nr_fields = cloud_out.fields.size ();
    int nr_points = cloud_out.width * cloud_out.height;
    for (size_t i = 1; i < clouds.size (); ++i)
    {
      assert (clouds[i]->data.size () / (clouds[i]->width * clouds[i]->height) == clouds[i]->point_step);

      if (clouds[i]->width != cloud_out.width || clouds[i]->height != cloud_out.height)
      {
        NODELET_ERROR ("[input_callback] Width/height of pointcloud %zu (%dx%d) differs from the others (%dx%d)!", 
            i, clouds[i]->width, clouds[i]->height, cloud_out.width, cloud_out.height);
        break;
      }
      // Point step must increase with the length of each new field
      cloud_out.point_step += clouds[i]->point_step;
      // Resize data to hold all clouds
      data_size += clouds[i]->data.size ();

      // Concatenate fields
      cloud_out.fields.resize (nr_fields + clouds[i]->fields.size ());
      int delta_offset = cloud_out.fields[nr_fields - 1].offset + pcl::getFieldSize (cloud_out.fields[nr_fields - 1].datatype);
      for (size_t d = 0; d < clouds[i]->fields.size (); ++d)
      {
        cloud_out.fields[nr_fields + d] = clouds[i]->fields[d];
        cloud_out.fields[nr_fields + d].offset += delta_offset;
      }
      nr_fields += clouds[i]->fields.size ();
    }
    // Recalculate row_step
    cloud_out.row_step = cloud_out.point_step * cloud_out.width;
    cloud_out.data.resize (data_size);

    // Iterate over each point and perform the appropriate memcpys
    int point_offset = 0;
    for (int cp = 0; cp < nr_points; ++cp)
    {
      for (size_t i = 0; i < clouds.size (); ++i)
      {
        // Copy each individual point
        memcpy (&cloud_out.data[point_offset], &clouds[i]->data[cp * clouds[i]->point_step], clouds[i]->point_step);
        point_offset += clouds[i]->point_step;
      }
    }
    pub_output_.publish (boost::make_shared<const PointCloud> (cloud_out));
    queue_.erase (cloud->header.stamp);
  }

  // Clean the queue to avoid overflowing
  if (maximum_queue_size_ > 0)
  {
    while ((int)queue_.size () > maximum_queue_size_)
      queue_.erase (queue_.begin ());
  }

}

typedef pcl_ros::PointCloudConcatenateFieldsSynchronizer PointCloudConcatenateFieldsSynchronizer;
PLUGINLIB_EXPORT_CLASS(PointCloudConcatenateFieldsSynchronizer,nodelet::Nodelet);