bag_publisher_maintain_time.cpp

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/* Author: Ridhwan Luthra */

#include "ros/ros.h"
#include <ros/package.h>
#include <rosbag/bag.h>
#include <rosbag/view.h>
#include <sensor_msgs/PointCloud2.h>

int main(int argc, char** argv)
{
  ros::init(argc, argv, "bag_publisher_maintain_time");
  ros::NodeHandle nh;
  ros::AsyncSpinner spinner(1);
  spinner.start();

  ros::Publisher point_cloud_publisher = nh.advertise<sensor_msgs::PointCloud2>("/camera/depth_registered/points", 1);

  // Variable holding the rosbag containing point cloud data.
  rosbag::Bag bagfile;
  std::string path = ros::package::getPath("moveit_tutorials");
  path += "/doc/perception_pipeline/bags/perception_tutorial.bag";
  bagfile.open(path, rosbag::bagmode::Read);

  std::vector<std::string> topics;
  topics.push_back("/camera/depth_registered/points");

  // Iterator for topics in bag.
  rosbag::View bag(bagfile, rosbag::TopicQuery(topics));

  sensor_msgs::PointCloud2::Ptr point_cloud_ptr = bag.begin()->instantiate<sensor_msgs::PointCloud2>();
  if (!point_cloud_ptr)
  {
    ROS_FATAL("invalid message in rosbag");
    return 1;
  }

  ros::Rate loop_rate(0.2);
  while (ros::ok())
  {
    point_cloud_ptr->header.stamp = ros::Time::now();
    point_cloud_publisher.publish(*point_cloud_ptr);
    loop_rate.sleep();
  }

  bagfile.close();
  return 0;
}