44 lines
1.6 KiB
Objective-C
44 lines
1.6 KiB
Objective-C
// 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
|