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// Copyright 2015 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 "cast/streaming/rtp_time.h"
#include <chrono>
#include "gtest/gtest.h"
#include "util/chrono_helpers.h"
namespace openscreen {
namespace cast {
// Tests that conversions between std::chrono durations and RtpTimeDelta are
// accurate. Note that this implicitly tests the conversions to/from
// RtpTimeTicks as well due to shared implementation.
TEST(RtpTimeDeltaTest, ConversionToAndFromDurations) {
constexpr int kTimebase = 48000;
// Origin in both timelines is equivalent.
ASSERT_EQ(RtpTimeDelta(), RtpTimeDelta::FromTicks(0));
ASSERT_EQ(RtpTimeDelta(),
RtpTimeDelta::FromDuration(microseconds(0), kTimebase));
ASSERT_EQ(microseconds::zero(),
RtpTimeDelta::FromTicks(0).ToDuration<microseconds>(kTimebase));
// Conversions that are exact (i.e., do not require rounding).
ASSERT_EQ(RtpTimeDelta::FromTicks(480),
RtpTimeDelta::FromDuration(milliseconds(10), kTimebase));
ASSERT_EQ(RtpTimeDelta::FromTicks(96000),
RtpTimeDelta::FromDuration(seconds(2), kTimebase));
ASSERT_EQ(milliseconds(10),
RtpTimeDelta::FromTicks(480).ToDuration<microseconds>(kTimebase));
ASSERT_EQ(seconds(2),
RtpTimeDelta::FromTicks(96000).ToDuration<microseconds>(kTimebase));
// Conversions that are approximate (i.e., are rounded).
for (int error_us = -3; error_us <= +3; ++error_us) {
ASSERT_EQ(
RtpTimeDelta::FromTicks(0),
RtpTimeDelta::FromDuration(microseconds(0 + error_us), kTimebase));
ASSERT_EQ(
RtpTimeDelta::FromTicks(1),
RtpTimeDelta::FromDuration(microseconds(21 + error_us), kTimebase));
ASSERT_EQ(
RtpTimeDelta::FromTicks(2),
RtpTimeDelta::FromDuration(microseconds(42 + error_us), kTimebase));
ASSERT_EQ(
RtpTimeDelta::FromTicks(3),
RtpTimeDelta::FromDuration(microseconds(63 + error_us), kTimebase));
ASSERT_EQ(
RtpTimeDelta::FromTicks(4),
RtpTimeDelta::FromDuration(microseconds(83 + error_us), kTimebase));
ASSERT_EQ(
RtpTimeDelta::FromTicks(11200000000000),
RtpTimeDelta::FromDuration(
microseconds(INT64_C(233333333333333) + error_us), kTimebase));
}
ASSERT_EQ(microseconds(21),
RtpTimeDelta::FromTicks(1).ToDuration<microseconds>(kTimebase));
ASSERT_EQ(microseconds(42),
RtpTimeDelta::FromTicks(2).ToDuration<microseconds>(kTimebase));
ASSERT_EQ(microseconds(63),
RtpTimeDelta::FromTicks(3).ToDuration<microseconds>(kTimebase));
ASSERT_EQ(microseconds(83),
RtpTimeDelta::FromTicks(4).ToDuration<microseconds>(kTimebase));
ASSERT_EQ(microseconds(INT64_C(233333333333333)),
RtpTimeDelta::FromTicks(11200000000000)
.ToDuration<microseconds>(kTimebase));
}
} // namespace cast
} // namespace openscreen
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