timestamp_util.h

// Copyright 2025 Google LLC. All rights reserved.
//
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file or at
// https://developers.google.com/open-source/licenses/bsd
 
#ifndef PACKAGER_MEDIA_BASE_TIMESTAMP_UTIL_H_
#define PACKAGER_MEDIA_BASE_TIMESTAMP_UTIL_H_
 
#include <cstdint>
 
namespace shaka {
namespace media {
 
// MPEG-2 TS PTS/DTS are 33-bit values that wrap around at 2^33
constexpr int64_t kPtsWrapAround =
    (1LL << 33);  // 8589934592 (~26.5 hours @ 90kHz)
constexpr int64_t kPtsHalfWrapAround =
    (1LL << 32);  // 4294967296 (~13.25 hours @ 90kHz)
 
int64_t SignedPtsDiff(int64_t a, int64_t b);
 
bool PtsIsBefore(int64_t a, int64_t b);
 
bool PtsIsBeforeOrEqual(int64_t a, int64_t b);
 
class PtsUnwrapper {
 public:
  PtsUnwrapper() = default;
 
  int64_t Unwrap(int64_t wrapped_pts);
 
  void Reset();
 
  bool IsInitialized() const { return initialized_; }
 
 private:
  bool initialized_ = false;
  int64_t last_wrapped_ = 0;
  int64_t unwrapped_offset_ = 0;
};
 
}  // namespace media
}  // namespace shaka
 
#endif  // PACKAGER_MEDIA_BASE_TIMESTAMP_UTIL_H_