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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.
#include "media/cast/rtp_timestamp_helper.h"
namespace media {
namespace cast {
RtpTimestampHelper::RtpTimestampHelper(int frequency)
: frequency_(frequency),
last_rtp_timestamp_(0) {
}
RtpTimestampHelper::~RtpTimestampHelper() {
}
bool RtpTimestampHelper::GetCurrentTimeAsRtpTimestamp(
const base::TimeTicks& now, uint32* rtp_timestamp) const {
if (last_capture_time_.is_null())
return false;
const base::TimeDelta elapsed_time = now - last_capture_time_;
const int64 rtp_delta =
elapsed_time * frequency_ / base::TimeDelta::FromSeconds(1);
*rtp_timestamp = last_rtp_timestamp_ + static_cast<uint32>(rtp_delta);
return true;
}
void RtpTimestampHelper::StoreLatestTime(
base::TimeTicks capture_time, uint32 rtp_timestamp) {
last_capture_time_ = capture_time;
last_rtp_timestamp_ = rtp_timestamp;
}
} // namespace cast
} // namespace media
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