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// Copyright 2014 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef MEDIA_FORMATS_MP2T_TIMESTAMP_UNROLLER_H_
#define MEDIA_FORMATS_MP2T_TIMESTAMP_UNROLLER_H_
#include <stdint.h>
#include "base/macros.h"
#include "media/base/media_export.h"
namespace media {
namespace mp2t {
class MEDIA_EXPORT TimestampUnroller {
public:
TimestampUnroller();
~TimestampUnroller();
// Given that |timestamp| is coded using 33 bits (accuracy of MPEG-2 TS
// timestamps), GetUnrolledTimestamp returns the corresponding unrolled
// timestamp.
// The unrolled timestamp is defined by:
// |timestamp| + k * (2 ^ 33)
// where k is estimated so that the unrolled timestamp is as close as
// possible to the previous unrolled timestamp returned by this function
// (if this function has not been called before, it will return the timestamp
// unmodified).
int64_t GetUnrolledTimestamp(int64_t timestamp);
// Reset the TimestampUnroller to its initial state.
void Reset();
private:
// Indicate whether the value of |previous_unrolled_timestamp_| is valid.
bool is_previous_timestamp_valid_;
// This is the last output of GetUnrolledTimestamp.
int64_t previous_unrolled_timestamp_;
DISALLOW_COPY_AND_ASSIGN(TimestampUnroller);
};
} // namespace mp2t
} // namespace media
#endif // MEDIA_FORMATS_MP2T_TIMESTAMP_UNROLLER_H_
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