How to control the fps of RGB / Depth image? about realsense-ros HOT 10 CLOSED

# Copyright 2023 Intel Corporation. All Rights Reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
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#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

"""Launch realsense2_camera node."""
import os
import yaml
from launch import LaunchDescription
import launch_ros.actions
from launch.actions import DeclareLaunchArgument, OpaqueFunction
from launch.substitutions import LaunchConfiguration


configurable_parameters = [{'name': 'camera_name',                  'default': 'camera', 'description': 'camera unique name'},
                           {'name': 'serial_no',                    'default': "''", 'description': 'choose device by serial number'},
                           {'name': 'usb_port_id',                  'default': "''", 'description': 'choose device by usb port id'},
                           {'name': 'device_type',                  'default': "''", 'description': 'choose device by type'},
                           {'name': 'config_file',                  'default': "''", 'description': 'yaml config file'},
                           {'name': 'unite_imu_method',             'default': "0", 'description': '[0-None, 1-copy, 2-linear_interpolation]'},
                           {'name': 'json_file_path',               'default': "''", 'description': 'allows advanced configuration'},
                           {'name': 'log_level',                    'default': 'info', 'description': 'debug log level [DEBUG|INFO|WARN|ERROR|FATAL]'},
                           {'name': 'output',                       'default': 'screen', 'description': 'pipe node output [screen|log]'},
                           {'name': 'depth_module.profile',         'default': '0,0,0', 'description': 'depth module profile'},                           
                           {'name': 'enable_depth',                 'default': 'true', 'description': 'enable depth stream'},
                           {'name': 'rgb_camera.profile',           'default': '0,0,0', 'description': 'color image width'},
                           {'name': 'rgb_camera.enable_auto_exposure', 'default': 'true', 'description': 'enable/disable auto exposure for color image'},
                           {'name': 'enable_color',                 'default': 'true', 'description': 'enable color stream'},
                           {'name': 'enable_infra1',                'default': 'false', 'description': 'enable infra1 stream'},
                           {'name': 'enable_infra2',                'default': 'false', 'description': 'enable infra2 stream'},
                           {'name': 'infra_rgb',                    'default': 'false', 'description': 'enable infra2 stream'},
                           {'name': 'enable_fisheye1',              'default': 'true', 'description': 'enable fisheye1 stream'},
                           {'name': 'enable_fisheye2',              'default': 'true', 'description': 'enable fisheye2 stream'},
                           {'name': 'enable_confidence',            'default': 'true', 'description': 'enable depth stream'},
                           {'name': 'gyro_fps',                     'default': '0', 'description': "''"},                           
                           {'name': 'accel_fps',                    'default': '0', 'description': "''"},                           
                           {'name': 'enable_gyro',                  'default': 'false', 'description': "''"},                           
                           {'name': 'enable_accel',                 'default': 'false', 'description': "''"},                           
                           {'name': 'enable_pose',                  'default': 'true', 'description': "''"},                           
                           {'name': 'pose_fps',                     'default': '200', 'description': "''"},                           
                           {'name': 'pointcloud.enable',            'default': 'true', 'description': ''}, 
                           {'name': 'pointcloud.stream_filter',     'default': '2', 'description': 'texture stream for pointcloud'},
                           {'name': 'pointcloud.stream_index_filter','default': '0', 'description': 'texture stream index for pointcloud'},
                           {'name': 'enable_sync',                  'default': 'true', 'description': "''"},                           
                           {'name': 'align_depth.enable',           'default': 'true', 'description': "''"},                           
                           {'name': 'colorizer.enable',             'default': 'false', 'description': "''"},
                           {'name': 'clip_distance',                'default': '-2.', 'description': "''"},                           
                           {'name': 'linear_accel_cov',             'default': '0.01', 'description': "''"},                           
                           {'name': 'initial_reset',                'default': 'false', 'description': "''"},                           
                           {'name': 'allow_no_texture_points',      'default': 'false', 'description': "''"},                           
                           {'name': 'pointcloud.ordered_pc',        'default': 'true', 'description': ''},
                           {'name': 'publish_tf',                   'default': 'true', 'description': '[bool] enable/disable publishing static & dynamic TF'},
                           {'name': 'tf_publish_rate',              'default': '0.0', 'description': '[double] rate in Hz for publishing dynamic TF'},
                           {'name': 'diagnostics_period',           'default': '0.0', 'description': 'Rate of publishing diagnostics. 0=Disabled'},
                           {'name': 'decimation_filter.enable',     'default': 'false', 'description': 'Rate of publishing static_tf'},
                           {'name': 'rosbag_filename',              'default': "''", 'description': 'A realsense bagfile to run from as a device'},
                           {'name': 'depth_module.exposure.1',      'default': '7500', 'description': 'Depth module first exposure value. Used for hdr_merge filter'},
                           {'name': 'depth_module.gain.1',          'default': '16', 'description': 'Depth module first gain value. Used for hdr_merge filter'},
                           {'name': 'depth_module.exposure.2',      'default': '1', 'description': 'Depth module second exposure value. Used for hdr_merge filter'},
                           {'name': 'depth_module.gain.2',          'default': '16', 'description': 'Depth module second gain value. Used for hdr_merge filter'},
                           {'name': 'depth_module.exposure',        'default': '8500', 'description': 'Depth module manual exposure value'},
                           {'name': 'depth_module.hdr_enabled',     'default': 'false', 'description': 'Depth module hdr enablement flag. Used for hdr_merge filter'},
                           {'name': 'depth_module.enable_auto_exposure', 'default': 'true', 'description': 'enable/disable auto exposure for depth image'},
                           {'name': 'hdr_merge.enable',             'default': 'false', 'description': 'hdr_merge filter enablement flag'},
                           {'name': 'wait_for_device_timeout',      'default': '-1.', 'description': 'Timeout for waiting for device to connect (Seconds)'},
                           {'name': 'reconnect_timeout',            'default': '6.', 'description': 'Timeout(seconds) between consequtive reconnection attempts'},
                          ]

def declare_configurable_parameters(parameters):
    return [DeclareLaunchArgument(param['name'], default_value=param['default'], description=param['description']) for param in parameters]

def set_configurable_parameters(parameters):
    return dict([(param['name'], LaunchConfiguration(param['name'])) for param in parameters])

def yaml_to_dict(path_to_yaml):
    with open(path_to_yaml, "r") as f:
        return yaml.load(f, Loader=yaml.SafeLoader)

def launch_setup(context, *args, **kwargs):
    _config_file = LaunchConfiguration("config_file").perform(context)
    params_from_file = {} if _config_file == "''" else yaml_to_dict(_config_file)
    log_level = 'info'
    # Realsense
    if (os.getenv('ROS_DISTRO') == "dashing") or (os.getenv('ROS_DISTRO') == "eloquent"):
        return [
            launch_ros.actions.Node(
                package='realsense2_camera',
                node_namespace=LaunchConfiguration("camera_name"),
                node_name=LaunchConfiguration("camera_name"),
                node_executable='realsense2_camera_node',
                prefix=['stdbuf -o L'],
                parameters=[set_configurable_parameters(configurable_parameters)
                            , params_from_file
                            ],
                output='screen',
                arguments=['--ros-args', '--log-level', LaunchConfiguration('log_level')],
                )
            ]
    else:
        return [
            launch_ros.actions.Node(
                package='realsense2_camera',
                namespace=LaunchConfiguration("camera_name"),
                name=LaunchConfiguration("camera_name"),
                executable='realsense2_camera_node',
                parameters=[set_configurable_parameters(configurable_parameters)
                            , params_from_file
                            ],
                output='screen',
                arguments=['--ros-args', '--log-level', LaunchConfiguration('log_level')],
                emulate_tty=True,
                )
        ]
    
def generate_launch_description():
    return LaunchDescription(declare_configurable_parameters(configurable_parameters) + [
        OpaqueFunction(function=launch_setup)
    ])