# MediaPipe object tracking subgraph.

type: "ObjectTrackingSubgraphCpu"

input_stream: "VIDEO:input_video"
input_stream: "DETECTIONS:new_detections"
output_stream: "DETECTIONS:tracked_detections"

# Assigns an unique id for each new detection.
node {
  calculator: "DetectionUniqueIdCalculator"
  input_stream: "DETECTIONS:new_detections"
  output_stream: "DETECTIONS:detections_with_id"
}

# Converts detections to TimedBox protos which are used as initial location
# for tracking.
node {
  calculator: "DetectionsToTimedBoxListCalculator"
  input_stream: "DETECTIONS:detections_with_id"
  output_stream: "BOXES:start_pos"
}

# Subgraph that tracks boxes (see box_tracking_cpu.pbtxt).
node {
  calculator: "BoxTrackingSubgraphCpu"
  input_stream: "VIDEO:input_video"
  input_stream: "BOXES:start_pos"
  input_stream: "CANCEL_ID:cancel_object_id"
  output_stream: "BOXES:boxes"
}

# Managers new detected objects and objects that are being tracked.
# It associates the duplicated detections and updates the locations of
# detections from tracking.
node: {
  calculator: "TrackedDetectionManagerCalculator"
  input_stream: "DETECTIONS:detections_with_id"
  input_stream: "TRACKING_BOXES:boxes"
  output_stream: "DETECTIONS:tracked_detections"
  output_stream: "CANCEL_OBJECT_ID:cancel_object_id"

  input_stream_handler {
    input_stream_handler: "SyncSetInputStreamHandler"
    options {
      [mediapipe.SyncSetInputStreamHandlerOptions.ext] {
        sync_set {
          tag_index: "TRACKING_BOXES"
        }
        sync_set {
          tag_index: "DETECTIONS"
        }
      }
    }
  }
}