51 lines
1.6 KiB
Plaintext
51 lines
1.6 KiB
Plaintext
// Copyright 2019 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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#import "MPPTimestampConverter.h"
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@implementation MPPTimestampConverter {
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mediapipe::Timestamp _mediapipeTimestamp;
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mediapipe::Timestamp _lastTimestamp;
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mediapipe::TimestampDiff _timestampOffset;
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}
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- (instancetype)init
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{
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self = [super init];
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if (self) {
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[self reset];
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}
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return self;
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}
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- (void)reset {
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_mediapipeTimestamp = mediapipe::Timestamp::Min();
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_lastTimestamp = _mediapipeTimestamp;
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_timestampOffset = 0;
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}
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- (mediapipe::Timestamp)timestampForMediaTime:(CMTime)mediaTime {
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Float64 sampleSeconds = CMTIME_IS_VALID(mediaTime) ? CMTimeGetSeconds(mediaTime) : 0;
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const int64 sampleUsec = sampleSeconds * mediapipe::Timestamp::kTimestampUnitsPerSecond;
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_mediapipeTimestamp = mediapipe::Timestamp(sampleUsec) + _timestampOffset;
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if (_mediapipeTimestamp <= _lastTimestamp) {
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_timestampOffset = _timestampOffset + _lastTimestamp + 1 - _mediapipeTimestamp;
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_mediapipeTimestamp = _lastTimestamp + 1;
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}
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_lastTimestamp = _mediapipeTimestamp;
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return _mediapipeTimestamp;
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}
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@end
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