Correct the timestamp in the vision tasks result objects.

PiperOrigin-RevId: 487597999

mediapipe/tasks/java/com/google/mediapipe/tasks/vision/core/BaseVisionTaskApi.java

@@ -160,4 +160,18 @@ public class BaseVisionTaskApi implements AutoCloseable {
         .setRotation(-(float) Math.PI * imageProcessingOptions.rotationDegrees() / 180.0f)
         .build();
   }
+
+  /**
+   * Generates the timestamp of a vision task result object from the vision task running mode and
+   * the output packet.
+   *
+   * @param runningMode MediaPipe Vision Tasks {@link RunningMode}.
+   * @param packet the output {@link Packet}.
+   */
+  public static long generateResultTimestampMs(RunningMode runningMode, Packet packet) {
+    if (runningMode == RunningMode.IMAGE) {
+      return -1;
+    }
+    return packet.getTimestamp() / MICROSECONDS_PER_MILLISECOND;
+  }
 }

mediapipe/tasks/java/com/google/mediapipe/tasks/vision/gesturerecognizer/GestureRecognizer.java

@@ -175,7 +175,8 @@ public final class GestureRecognizer extends BaseVisionTaskApi {
                     packets.get(HANDEDNESS_OUT_STREAM_INDEX), ClassificationList.parser()),
                 PacketGetter.getProtoVector(
                     packets.get(HAND_GESTURES_OUT_STREAM_INDEX), ClassificationList.parser()),
-                packets.get(HAND_GESTURES_OUT_STREAM_INDEX).getTimestamp());
+                BaseVisionTaskApi.generateResultTimestampMs(
+                    recognizerOptions.runningMode(), packets.get(HAND_GESTURES_OUT_STREAM_INDEX)));
           }
 
           @Override

mediapipe/tasks/java/com/google/mediapipe/tasks/vision/handlandmarker/HandLandmarker.java

@@ -165,7 +165,8 @@ public final class HandLandmarker extends BaseVisionTaskApi {
                     packets.get(WORLD_LANDMARKS_OUT_STREAM_INDEX), LandmarkList.parser()),
                 PacketGetter.getProtoVector(
                     packets.get(HANDEDNESS_OUT_STREAM_INDEX), ClassificationList.parser()),
-                packets.get(LANDMARKS_OUT_STREAM_INDEX).getTimestamp());
+                BaseVisionTaskApi.generateResultTimestampMs(
+                    landmarkerOptions.runningMode(), packets.get(LANDMARKS_OUT_STREAM_INDEX)));
           }
 
           @Override

mediapipe/tasks/java/com/google/mediapipe/tasks/vision/imageclassifier/ImageClassifier.java

@@ -176,7 +176,8 @@ public final class ImageClassifier extends BaseVisionTaskApi {
                       PacketGetter.getProto(
                           packets.get(CLASSIFICATIONS_OUT_STREAM_INDEX),
                           ClassificationsProto.ClassificationResult.getDefaultInstance())),
-                  packets.get(CLASSIFICATIONS_OUT_STREAM_INDEX).getTimestamp());
+                  BaseVisionTaskApi.generateResultTimestampMs(
+                      options.runningMode(), packets.get(CLASSIFICATIONS_OUT_STREAM_INDEX)));
             } catch (IOException e) {
               throw new MediaPipeException(
                   MediaPipeException.StatusCode.INTERNAL.ordinal(), e.getMessage());

mediapipe/tasks/java/com/google/mediapipe/tasks/vision/objectdetector/ObjectDetector.java

@@ -173,7 +173,8 @@ public final class ObjectDetector extends BaseVisionTaskApi {
             return ObjectDetectionResult.create(
                 PacketGetter.getProtoVector(
                     packets.get(DETECTIONS_OUT_STREAM_INDEX), Detection.parser()),
-                packets.get(DETECTIONS_OUT_STREAM_INDEX).getTimestamp());
+                BaseVisionTaskApi.generateResultTimestampMs(
+                    detectorOptions.runningMode(), packets.get(DETECTIONS_OUT_STREAM_INDEX)));
           }
 
           @Override