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PiperOrigin-RevId: 263889205

mediapipe/objc/MPPTimestampConverter.h

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+// Copyright 2019 The MediaPipe Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#import <CoreMedia/CoreMedia.h>
+#import <Foundation/Foundation.h>
+
+#include "mediapipe/framework/calculator_framework.h"
+#include "mediapipe/objc/util.h"
+
+/// Helps convert a CMTime to a MediaPipe timestamp.
+@interface MPPTimestampConverter : NSObject
+
+/// The last timestamp returned by timestampForMediaTime:.
+@property(nonatomic, readonly) mediapipe::Timestamp lastTimestamp;
+
+/// Initializer.
+- (instancetype)init NS_DESIGNATED_INITIALIZER;
+
+/// Resets the object. After this method is called, we can return timestamps
+/// that are lower than previously returned timestamps.
+- (void)reset;
+
+/// Converts a CMTime to a MediaPipe timestamp. This ensures that MediaPipe
+/// timestamps
+/// are always increasing: if the provided CMTime has gone backwards (e.g. if
+/// it's from a
+/// looping video), we shift all timestamps from that point on to keep the
+/// output increasing.
+/// This state is erased when reset is called.
+- (mediapipe::Timestamp)timestampForMediaTime:(CMTime)mediaTime;
+
+@end