86 lines
2.7 KiB
C++
86 lines
2.7 KiB
C++
// Copyright 2020 The MediaPipe Authors.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#include "mediapipe/framework/calculator_framework.h"
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#include "mediapipe/framework/formats/landmark.pb.h"
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#include "mediapipe/framework/port/ret_check.h"
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namespace mediapipe {
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namespace {
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constexpr char kNormalizedLandmarksTag[] = "NORM_LANDMARKS";
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constexpr char kVisibilityTag[] = "VISIBILITY";
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} // namespace
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// A calculator to extract visibility from the landmark.
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//
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// Inputs:
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// NORM_LANDMARKS: A NormalizedLandmarkList with only a single landmark to
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// take visibility from. It's a list and not single landmark as
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// split/concatenate calculators work with lists.
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//
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// Outputs:
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// VISIBILITY: Float visibility of the given landmark.
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//
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// Example config:
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// node {
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// calculator: "LandmarkVisibilityCalculator"
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// input_stream: "NORM_LANDMARKS:landmarks"
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// output_stream: "VISIBILITY:visibility"
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// }
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//
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class LandmarkVisibilityCalculator : public CalculatorBase {
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public:
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static absl::Status GetContract(CalculatorContract* cc);
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absl::Status Open(CalculatorContext* cc) override;
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absl::Status Process(CalculatorContext* cc) override;
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};
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REGISTER_CALCULATOR(LandmarkVisibilityCalculator);
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absl::Status LandmarkVisibilityCalculator::GetContract(CalculatorContract* cc) {
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cc->Inputs().Tag(kNormalizedLandmarksTag).Set<NormalizedLandmarkList>();
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cc->Outputs().Tag(kVisibilityTag).Set<float>();
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return absl::OkStatus();
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}
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absl::Status LandmarkVisibilityCalculator::Open(CalculatorContext* cc) {
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cc->SetOffset(TimestampDiff(0));
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return absl::OkStatus();
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}
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absl::Status LandmarkVisibilityCalculator::Process(CalculatorContext* cc) {
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// Check that landmark is not empty.
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// Don't emit an empty packet for this timestamp.
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if (cc->Inputs().Tag(kNormalizedLandmarksTag).IsEmpty()) {
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return absl::OkStatus();
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}
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const auto& landmarks =
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cc->Inputs().Tag(kNormalizedLandmarksTag).Get<NormalizedLandmarkList>();
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RET_CHECK_EQ(landmarks.landmark_size(), 1);
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float visibility = landmarks.landmark(0).visibility();
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cc->Outputs()
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.Tag(kVisibilityTag)
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.AddPacket(MakePacket<float>(visibility).At(cc->InputTimestamp()));
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return absl::OkStatus();
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}
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} // namespace mediapipe
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