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// Copyright (c) 2012 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/base/audio_timestamp_helper.h"
#include "media/base/buffers.h"
#include "testing/gtest/include/gtest/gtest.h"
namespace media {
static const int kBytesPerFrame = 4;
static const int kDefaultSampleRate = 44100;
class AudioTimestampHelperTest : public ::testing::Test {
public:
AudioTimestampHelperTest()
: helper_(kBytesPerFrame, kDefaultSampleRate) {
helper_.SetBaseTimestamp(base::TimeDelta());
}
// Adds bytes to the helper and returns the current timestamp in microseconds.
int64 AddBytes(int bytes) {
helper_.AddBytes(bytes);
return helper_.GetTimestamp().InMicroseconds();
}
int64 BytesToTarget(int target_in_microseconds) {
return helper_.GetBytesToTarget(
base::TimeDelta::FromMicroseconds(target_in_microseconds));
}
void TestGetBytesToTargetRange(int byte_count, int start, int end) {
for (int i = start; i <= end; ++i)
EXPECT_EQ(byte_count,BytesToTarget(i)) << " Failure for timestamp "
<< i << " us.";
}
protected:
AudioTimestampHelper helper_;
DISALLOW_COPY_AND_ASSIGN(AudioTimestampHelperTest);
};
TEST_F(AudioTimestampHelperTest, Basic) {
EXPECT_EQ(0, helper_.GetTimestamp().InMicroseconds());
// Verify that the output timestamp is always rounded down to the
// nearest microsecond. 1 frame @ 44100 is ~22.67573 microseconds,
// which is why the timestamp sometimes increments by 23 microseconds
// and other times it increments by 22 microseconds.
EXPECT_EQ(0, AddBytes(0));
EXPECT_EQ(22, AddBytes(kBytesPerFrame));
EXPECT_EQ(45, AddBytes(kBytesPerFrame));
EXPECT_EQ(68, AddBytes(kBytesPerFrame));
EXPECT_EQ(90, AddBytes(kBytesPerFrame));
EXPECT_EQ(113, AddBytes(kBytesPerFrame));
// Verify that adding bytes one frame at a time matches the timestamp returned
// if the same number of bytes are added all at once.
base::TimeDelta timestamp_1 = helper_.GetTimestamp();
helper_.SetBaseTimestamp(kNoTimestamp());
EXPECT_TRUE(kNoTimestamp() == helper_.base_timestamp());
helper_.SetBaseTimestamp(base::TimeDelta());
EXPECT_EQ(0, helper_.GetTimestamp().InMicroseconds());
helper_.AddBytes(5 * kBytesPerFrame);
EXPECT_EQ(113, helper_.GetTimestamp().InMicroseconds());
EXPECT_TRUE(timestamp_1 == helper_.GetTimestamp());
}
TEST_F(AudioTimestampHelperTest, GetDuration) {
helper_.SetBaseTimestamp(base::TimeDelta::FromMicroseconds(100));
int byte_count = 5 * kBytesPerFrame;
int64 expected_durations[] = { 113, 113, 114, 113, 113, 114 };
for (size_t i = 0; i < arraysize(expected_durations); ++i) {
base::TimeDelta duration = helper_.GetDuration(byte_count);
EXPECT_EQ(expected_durations[i], duration.InMicroseconds());
base::TimeDelta timestamp_1 = helper_.GetTimestamp() + duration;
helper_.AddBytes(byte_count);
base::TimeDelta timestamp_2 = helper_.GetTimestamp();
EXPECT_TRUE(timestamp_1 == timestamp_2);
}
}
TEST_F(AudioTimestampHelperTest, GetBytesToTarget) {
// Verify GetBytesToTarget() rounding behavior.
// 1 frame @ 44100 is ~22.67573 microseconds,
// Test values less than half of the frame duration.
TestGetBytesToTargetRange(0, 0, 11);
// Test values between half the frame duration & the
// full frame duration.
TestGetBytesToTargetRange(kBytesPerFrame, 12, 22);
// Verify that the same number of bytes is returned up
// to the next half a frame.
TestGetBytesToTargetRange(kBytesPerFrame, 23, 34);
// Verify the next 3 ranges.
TestGetBytesToTargetRange(2 * kBytesPerFrame, 35, 56);
TestGetBytesToTargetRange(3 * kBytesPerFrame, 57, 79);
TestGetBytesToTargetRange(4 * kBytesPerFrame, 80, 102);
TestGetBytesToTargetRange(5 * kBytesPerFrame, 103, 124);
// Add bytes to the helper so negative byte counts can
// be tested.
helper_.AddBytes(5 * kBytesPerFrame);
// Note: The timestamp ranges must match the positive values
// tested above to verify that the code is rounding properly.
TestGetBytesToTargetRange(0 * kBytesPerFrame, 103, 124);
TestGetBytesToTargetRange(-1 * kBytesPerFrame, 80, 102);
TestGetBytesToTargetRange(-2 * kBytesPerFrame, 57, 79);
TestGetBytesToTargetRange(-3 * kBytesPerFrame, 35, 56);
TestGetBytesToTargetRange(-4 * kBytesPerFrame, 12, 34);
TestGetBytesToTargetRange(-5 * kBytesPerFrame, 0, 11);
}
} // namespace media
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