# MediaPipe graph that applies a face effect to the input video stream.

# GPU buffer. (GpuBuffer)
input_stream: "input_video"

# An integer, which indicate which effect is selected. (int)
#
# If `selected_effect_id` is `0`, the Axis effect is selected.
# If `selected_effect_id` is `1`, the Facepaint effect is selected.
# If `selected_effect_id` is `2`, the Glasses effect is selected.
#
# No other values are allowed for `selected_effect_id`.
input_stream: "selected_effect_id"

# Indicates whether to use the face detection as the input source. (bool)
#
# If `true`, the face detection pipeline will be used to produce landmarks.
# If `false`, the face landmark pipeline will be used to produce landmarks.
input_side_packet: "use_face_detection_input_source"

# Output image with rendered results. (GpuBuffer)
output_stream: "output_video"

# A list of geometry data for a single detected face.
#
# NOTE: there will not be an output packet in this stream for this particular
# timestamp if none of faces detected.
#
# (std::vector<face_geometry::FaceGeometry>)
output_stream: "multi_face_geometry"

# Throttles the images flowing downstream for flow control. It passes through
# the very first incoming image unaltered, and waits for downstream nodes
# (calculators and subgraphs) in the graph to finish their tasks before it
# passes through another image. All images that come in while waiting are
# dropped, limiting the number of in-flight images in most part of the graph to
# 1. This prevents the downstream nodes from queuing up incoming images and data
# excessively, which leads to increased latency and memory usage, unwanted in
# real-time mobile applications. It also eliminates unnecessarily computation,
# e.g., the output produced by a node may get dropped downstream if the
# subsequent nodes are still busy processing previous inputs.
node {
  calculator: "FlowLimiterCalculator"
  input_stream: "input_video"
  input_stream: "FINISHED:output_video"
  input_stream_info: {
    tag_index: "FINISHED"
    back_edge: true
  }
  output_stream: "throttled_input_video"
}

# Generates an environment that describes the current virtual scene.
node {
  calculator: "FaceGeometryEnvGeneratorCalculator"
  output_side_packet: "ENVIRONMENT:environment"
  node_options: {
    [type.googleapis.com/mediapipe.FaceGeometryEnvGeneratorCalculatorOptions] {
      environment: {
        origin_point_location: TOP_LEFT_CORNER
        perspective_camera: {
          vertical_fov_degrees: 63.0  # 63 degrees
          near: 1.0  # 1cm
          far: 10000.0  # 100m
        }
      }
    }
  }
}

# Computes the face geometry for a single face. The input source is defined
# through `use_face_detection_input_source`.
node {
  calculator: "SwitchContainer"
  input_stream: "IMAGE:throttled_input_video"
  input_side_packet: "ENABLE:use_face_detection_input_source"
  input_side_packet: "ENVIRONMENT:environment"
  output_stream: "MULTI_FACE_GEOMETRY:multi_face_geometry"
  node_options: {
    [type.googleapis.com/mediapipe.SwitchContainerOptions] {
      contained_node: {
        calculator: "SingleFaceGeometryFromLandmarksGpu"
      }
      contained_node: {
        calculator: "SingleFaceGeometryFromDetectionGpu"
      }
    }
  }
}

# Renders the selected effect based on `selected_effect_id`.
node {
  calculator: "SwitchContainer"
  input_stream: "SELECT:selected_effect_id"
  input_stream: "IMAGE_GPU:throttled_input_video"
  input_stream: "MULTI_FACE_GEOMETRY:multi_face_geometry"
  input_side_packet: "ENVIRONMENT:environment"
  output_stream: "IMAGE_GPU:output_video"
  node_options: {
    [type.googleapis.com/mediapipe.SwitchContainerOptions] {
      contained_node: {
        calculator: "FaceGeometryEffectRendererCalculator"
        node_options: {
          [type.googleapis.com/mediapipe.FaceGeometryEffectRendererCalculatorOptions] {
            effect_texture_path: "mediapipe/graphs/face_effect/data/axis.pngblob"
            effect_mesh_3d_path: "mediapipe/graphs/face_effect/data/axis.binarypb"
          }
        }
      }
      contained_node: {
        calculator: "FaceGeometryEffectRendererCalculator"
        node_options: {
          [type.googleapis.com/mediapipe.FaceGeometryEffectRendererCalculatorOptions] {
            effect_texture_path: "mediapipe/graphs/face_effect/data/facepaint.pngblob"
          }
        }
      }
      contained_node: {
        calculator: "FaceGeometryEffectRendererCalculator"
        node_options: {
          [type.googleapis.com/mediapipe.FaceGeometryEffectRendererCalculatorOptions] {
            effect_texture_path: "mediapipe/graphs/face_effect/data/glasses.pngblob"
            effect_mesh_3d_path: "mediapipe/graphs/face_effect/data/glasses.binarypb"
          }
        }
      }
    }
  }
}