threshold stream utility function.

PiperOrigin-RevId: 566417914

mediapipe/framework/api2/stream/BUILD

@@ -167,3 +167,28 @@ cc_test(
         "//mediapipe/framework/port:parse_text_proto",
     ],
 )
+
+cc_library(
+    name = "threshold",
+    srcs = ["threshold.cc"],
+    hdrs = ["threshold.h"],
+    deps = [
+        "//mediapipe/calculators/util:thresholding_calculator",
+        "//mediapipe/calculators/util:thresholding_calculator_cc_proto",
+        "//mediapipe/framework/api2:builder",
+    ],
+)
+
+cc_test(
+    name = "threshold_test",
+    srcs = ["threshold_test.cc"],
+    deps = [
+        ":threshold",
+        "//mediapipe/framework:calculator_framework",
+        "//mediapipe/framework/api2:builder",
+        "//mediapipe/framework/port:gtest",
+        "//mediapipe/framework/port:gtest_main",
+        "//mediapipe/framework/port:parse_text_proto",
+        "//mediapipe/framework/port:status_matchers",
+    ],
+)

mediapipe/framework/api2/stream/threshold.cc

@@ -0,0 +1,17 @@
+#include "mediapipe/framework/api2/stream/threshold.h"
+
+#include "mediapipe/calculators/util/thresholding_calculator.pb.h"
+#include "mediapipe/framework/api2/builder.h"
+
+namespace mediapipe::api2::builder {
+
+Stream<bool> IsOverThreshold(Stream<float> value, double threshold,
+                             mediapipe::api2::builder::Graph& graph) {
+  auto& node = graph.AddNode("ThresholdingCalculator");
+  auto& node_opts = node.GetOptions<mediapipe::ThresholdingCalculatorOptions>();
+  node_opts.set_threshold(threshold);
+  value.ConnectTo(node.In("FLOAT"));
+  return node.Out("FLAG").Cast<bool>();
+}
+
+}  // namespace mediapipe::api2::builder

mediapipe/framework/api2/stream/threshold.h

@@ -0,0 +1,13 @@
+#ifndef MEDIAPIPE_FRAMEWORK_API2_STREAM_THRESHOLD_H_
+#define MEDIAPIPE_FRAMEWORK_API2_STREAM_THRESHOLD_H_
+
+#include "mediapipe/framework/api2/builder.h"
+
+namespace mediapipe::api2::builder {
+
+Stream<bool> IsOverThreshold(Stream<float> value, double threshold,
+                             Graph& graph);
+
+}  // namespace mediapipe::api2::builder
+
+#endif  // MEDIAPIPE_FRAMEWORK_API2_STREAM_THRESHOLD_H_

mediapipe/framework/api2/stream/threshold_test.cc

@@ -0,0 +1,39 @@
+#include "mediapipe/framework/api2/stream/threshold.h"
+
+#include "mediapipe/framework/api2/builder.h"
+#include "mediapipe/framework/calculator_framework.h"
+#include "mediapipe/framework/port/gmock.h"
+#include "mediapipe/framework/port/gtest.h"
+#include "mediapipe/framework/port/parse_text_proto.h"
+#include "mediapipe/framework/port/status_matchers.h"
+
+namespace mediapipe::api2::builder {
+namespace {
+
+TEST(ThresholdTest, IsOverThresholdTest) {
+  mediapipe::api2::builder::Graph graph;
+
+  Stream<float> score = graph.In("SCORE").Cast<float>();
+  Stream<bool> flag = IsOverThreshold(score, /*threshold=*/0.5f, graph);
+  flag.SetName("flag");
+
+  EXPECT_THAT(
+      graph.GetConfig(),
+      EqualsProto(mediapipe::ParseTextProtoOrDie<CalculatorGraphConfig>(R"pb(
+        node {
+          calculator: "ThresholdingCalculator"
+          input_stream: "FLOAT:__stream_0"
+          output_stream: "FLAG:flag"
+          options {
+            [mediapipe.ThresholdingCalculatorOptions.ext] { threshold: 0.5 }
+          }
+        }
+        input_stream: "SCORE:__stream_0"
+      )pb")));
+
+  CalculatorGraph calcualtor_graph;
+  MP_EXPECT_OK(calcualtor_graph.Initialize(graph.GetConfig()));
+}
+
+}  // namespace
+}  // namespace mediapipe::api2::builder