SystemTime.h - mozsearch

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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */

/* vim:set ts=2 sw=2 sts=2 et cindent: */

/* This Source Code Form is subject to the terms of the Mozilla Public

 * License, v. 2.0. If a copy of the MPL was not distributed with this file,

 * You can obtain one at http://mozilla.org/MPL/2.0/. */

#ifndef DOM_MEDIA_WEBRTC_LIBWEBRTCGLUE_SYSTEMTIMENANOS_H_

#define DOM_MEDIA_WEBRTC_LIBWEBRTCGLUE_SYSTEMTIMENANOS_H_

#include "jsapi/RTCStatsReport.h"

#include "mozilla/TimeStamp.h"

#include "system_wrappers/include/clock.h"

namespace mozilla {

class RTCStatsTimestampMakerRealtimeClock : public webrtc::Clock {

 public:

  explicit RTCStatsTimestampMakerRealtimeClock(

      const dom::RTCStatsTimestampMaker& aTimestampMaker);

  webrtc::Timestamp CurrentTime() override;

  // Upstream, this method depend on rtc::TimeUTCMicros for converting the

  // monotonic system clock to Ntp, if only for the first call when deciding the

  // Ntp offset.

  // We override this to be able to use our own clock instead of

  // rtc::TimeUTCMicros for ntp timestamps.

  webrtc::NtpTime ConvertTimestampToNtpTime(

      webrtc::Timestamp aRealtime) override;

  const dom::RTCStatsTimestampMaker mTimestampMaker;

};

// The time base used for WebrtcSystemTime(). Completely arbitrary. Constant.

TimeStamp WebrtcSystemTimeBase();

// The returned timestamp denotes the monotonic time passed since

// WebrtcSystemTimeBase(). Libwebrtc uses this to track how time advances from a

// specific point in time. It adds an offset to make the timestamps absolute.

webrtc::Timestamp WebrtcSystemTime();

webrtc::NtpTime CreateNtp(webrtc::Timestamp aTime);

}  // namespace mozilla

#endif