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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 "base/bind.h"
#include "base/message_loop/message_loop.h"
#include "base/time/time.h"
#include "media/audio/audio_parameters.h"
#include "media/audio/fake_audio_worker.h"
#include "media/audio/simple_sources.h"
#include "testing/gtest/include/gtest/gtest.h"
namespace media {
static const int kTestCallbacks = 5;
class FakeAudioWorkerTest : public testing::Test {
public:
FakeAudioWorkerTest()
: params_(
AudioParameters::AUDIO_FAKE, CHANNEL_LAYOUT_STEREO, 44100, 8, 128),
fake_worker_(message_loop_.task_runner(), params_),
seen_callbacks_(0) {
time_between_callbacks_ = base::TimeDelta::FromMicroseconds(
params_.frames_per_buffer() * base::Time::kMicrosecondsPerSecond /
static_cast<float>(params_.sample_rate()));
}
~FakeAudioWorkerTest() override {}
void CalledByFakeWorker() {
seen_callbacks_++;
}
void RunOnAudioThread() {
ASSERT_TRUE(message_loop_.task_runner()->BelongsToCurrentThread());
fake_worker_.Start(base::Bind(
&FakeAudioWorkerTest::CalledByFakeWorker, base::Unretained(this)));
}
void RunOnceOnAudioThread() {
ASSERT_TRUE(message_loop_.task_runner()->BelongsToCurrentThread());
RunOnAudioThread();
// Start() should immediately post a task to run the callback, so we
// should end up with only a single callback being run.
message_loop_.PostTask(FROM_HERE, base::Bind(
&FakeAudioWorkerTest::EndTest, base::Unretained(this), 1));
}
void StopStartOnAudioThread() {
ASSERT_TRUE(message_loop_.task_runner()->BelongsToCurrentThread());
fake_worker_.Stop();
RunOnAudioThread();
}
void TimeCallbacksOnAudioThread(int callbacks) {
ASSERT_TRUE(message_loop_.task_runner()->BelongsToCurrentThread());
if (seen_callbacks_ == 0) {
RunOnAudioThread();
start_time_ = base::TimeTicks::Now();
}
// Keep going until we've seen the requested number of callbacks.
if (seen_callbacks_ < callbacks) {
message_loop_.PostDelayedTask(FROM_HERE, base::Bind(
&FakeAudioWorkerTest::TimeCallbacksOnAudioThread,
base::Unretained(this), callbacks), time_between_callbacks_ / 2);
} else {
end_time_ = base::TimeTicks::Now();
EndTest(callbacks);
}
}
void EndTest(int callbacks) {
ASSERT_TRUE(message_loop_.task_runner()->BelongsToCurrentThread());
fake_worker_.Stop();
EXPECT_LE(callbacks, seen_callbacks_);
message_loop_.PostTask(FROM_HERE, base::MessageLoop::QuitWhenIdleClosure());
}
protected:
base::MessageLoop message_loop_;
AudioParameters params_;
FakeAudioWorker fake_worker_;
base::TimeTicks start_time_;
base::TimeTicks end_time_;
base::TimeDelta time_between_callbacks_;
int seen_callbacks_;
private:
DISALLOW_COPY_AND_ASSIGN(FakeAudioWorkerTest);
};
// Ensure the worker runs on the audio thread and fires callbacks.
TEST_F(FakeAudioWorkerTest, FakeBasicCallback) {
message_loop_.PostTask(FROM_HERE, base::Bind(
&FakeAudioWorkerTest::RunOnceOnAudioThread,
base::Unretained(this)));
message_loop_.Run();
}
// Ensure the time between callbacks is sane.
TEST_F(FakeAudioWorkerTest, TimeBetweenCallbacks) {
message_loop_.PostTask(FROM_HERE, base::Bind(
&FakeAudioWorkerTest::TimeCallbacksOnAudioThread,
base::Unretained(this), kTestCallbacks));
message_loop_.Run();
// There are only (kTestCallbacks - 1) intervals between kTestCallbacks.
base::TimeDelta actual_time_between_callbacks =
(end_time_ - start_time_) / (seen_callbacks_ - 1);
// Ensure callback time is no faster than the expected time between callbacks.
EXPECT_GE(actual_time_between_callbacks, time_between_callbacks_);
// Softly check if the callback time is no slower than twice the expected time
// between callbacks. Since this test runs on the bots we can't be too strict
// with the bounds.
if (actual_time_between_callbacks > 2 * time_between_callbacks_)
LOG(ERROR) << "Time between fake audio callbacks is too large!";
}
// Ensure Start()/Stop() on the worker doesn't generate too many callbacks. See
// http://crbug.com/159049.
TEST_F(FakeAudioWorkerTest, StartStopClearsCallbacks) {
message_loop_.PostTask(FROM_HERE, base::Bind(
&FakeAudioWorkerTest::TimeCallbacksOnAudioThread,
base::Unretained(this), kTestCallbacks));
// Issue a Stop() / Start() in between expected callbacks to maximize the
// chance of catching the worker doing the wrong thing.
message_loop_.PostDelayedTask(FROM_HERE, base::Bind(
&FakeAudioWorkerTest::StopStartOnAudioThread,
base::Unretained(this)), time_between_callbacks_ / 2);
// EndTest() will ensure the proper number of callbacks have occurred.
message_loop_.Run();
}
} // namespace media
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