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// Copyright 2015 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "remoting/protocol/audio_pump.h"
#include <stddef.h>
#include <array>
#include <memory>
#include <utility>
#include <vector>
#include "base/memory/ptr_util.h"
#include "base/memory/raw_ptr.h"
#include "base/run_loop.h"
#include "base/test/task_environment.h"
#include "remoting/codec/audio_encoder.h"
#include "remoting/proto/audio.pb.h"
#include "remoting/protocol/audio_source.h"
#include "remoting/protocol/audio_stub.h"
#include "remoting/protocol/fake_audio_source.h"
#include "testing/gtest/include/gtest/gtest.h"
namespace remoting::protocol {
namespace {
// Creates a dummy packet with 1k data.
std::unique_ptr<AudioPacket> MakeAudioPacket(int channel_count = 2) {
std::unique_ptr<AudioPacket> packet(new AudioPacket);
packet->add_data()->resize(1024);
packet->set_encoding(AudioPacket::ENCODING_RAW);
packet->set_sampling_rate(AudioPacket::SAMPLING_RATE_44100);
packet->set_bytes_per_sample(AudioPacket::BYTES_PER_SAMPLE_2);
packet->set_channels(static_cast<AudioPacket::Channels>(channel_count));
return packet;
}
} // namespace
class FakeAudioEncoder : public AudioEncoder {
public:
FakeAudioEncoder() = default;
FakeAudioEncoder(const FakeAudioEncoder&) = delete;
FakeAudioEncoder& operator=(const FakeAudioEncoder&) = delete;
~FakeAudioEncoder() override = default;
std::unique_ptr<AudioPacket> Encode(
std::unique_ptr<AudioPacket> packet) override {
EXPECT_TRUE(!!packet);
EXPECT_EQ(packet->encoding(), AudioPacket::ENCODING_RAW);
EXPECT_EQ(packet->sampling_rate(), AudioPacket::SAMPLING_RATE_44100);
EXPECT_EQ(packet->bytes_per_sample(), AudioPacket::BYTES_PER_SAMPLE_2);
EXPECT_LE(packet->channels(), AudioPacket::CHANNELS_STEREO);
return packet;
}
int GetBitrate() override { return 160000; }
};
class AudioPumpTest : public testing::Test, public protocol::AudioStub {
public:
AudioPumpTest() = default;
AudioPumpTest(const AudioPumpTest&) = delete;
AudioPumpTest& operator=(const AudioPumpTest&) = delete;
void SetUp() override;
void TearDown() override;
// protocol::AudioStub interface.
void ProcessAudioPacket(std::unique_ptr<AudioPacket> audio_packet,
base::OnceClosure done) override;
protected:
base::test::SingleThreadTaskEnvironment task_environment_;
// |source_| and |encoder_| are owned by the |pump_|.
raw_ptr<FakeAudioSource, AcrossTasksDanglingUntriaged> source_;
raw_ptr<FakeAudioEncoder, AcrossTasksDanglingUntriaged> encoder_;
std::unique_ptr<AudioPump> pump_;
std::vector<std::unique_ptr<AudioPacket>> sent_packets_;
std::vector<base::OnceClosure> done_closures_;
};
void AudioPumpTest::SetUp() {
source_ = new FakeAudioSource();
encoder_ = new FakeAudioEncoder();
pump_ = std::make_unique<AudioPump>(
task_environment_.GetMainThreadTaskRunner(),
base::WrapUnique(source_.get()), base::WrapUnique(encoder_.get()), this);
}
void AudioPumpTest::TearDown() {
pump_.reset();
// Let the message loop run to finish destroying the capturer.
base::RunLoop().RunUntilIdle();
}
void AudioPumpTest::ProcessAudioPacket(
std::unique_ptr<AudioPacket> audio_packet,
base::OnceClosure done) {
sent_packets_.push_back(std::move(audio_packet));
done_closures_.push_back(std::move(done));
}
// Verify that the pump pauses pumping when the network is congested.
TEST_F(AudioPumpTest, BufferSizeLimit) {
// Run message loop to let the pump start the capturer.
base::RunLoop().RunUntilIdle();
ASSERT_FALSE(source_->callback().is_null());
// Try sending 100 packets, 1k each. The pump should stop pumping and start
// dropping the data at some point.
for (size_t i = 0; i < 100; ++i) {
source_->callback().Run(MakeAudioPacket());
base::RunLoop().RunUntilIdle();
}
size_t num_sent_packets = sent_packets_.size();
EXPECT_LT(num_sent_packets, 100U);
EXPECT_GT(num_sent_packets, 0U);
// Call done closure for the first packet. This should allow one more packet
// to be sent below.
std::move(done_closures_.front()).Run();
base::RunLoop().RunUntilIdle();
// Verify that the pump continues to send captured audio.
source_->callback().Run(MakeAudioPacket());
base::RunLoop().RunUntilIdle();
EXPECT_EQ(num_sent_packets + 1, sent_packets_.size());
}
TEST_F(AudioPumpTest, DownmixAudioPacket) {
// Run message loop to let the pump start the capturer.
base::RunLoop().RunUntilIdle();
ASSERT_TRUE(source_->callback());
// Generate several audio packets with different channel counts.
static const auto kChannels = std::to_array<int>({
AudioPacket::CHANNELS_7_1, AudioPacket::CHANNELS_6_1,
AudioPacket::CHANNELS_5_1, AudioPacket::CHANNELS_STEREO,
AudioPacket::CHANNELS_MONO, AudioPacket::CHANNELS_7_1,
AudioPacket::CHANNELS_7_1, AudioPacket::CHANNELS_7_1,
AudioPacket::CHANNELS_7_1, AudioPacket::CHANNELS_6_1,
AudioPacket::CHANNELS_6_1, AudioPacket::CHANNELS_6_1,
AudioPacket::CHANNELS_6_1, AudioPacket::CHANNELS_5_1,
AudioPacket::CHANNELS_5_1, AudioPacket::CHANNELS_5_1,
AudioPacket::CHANNELS_5_1, AudioPacket::CHANNELS_STEREO,
AudioPacket::CHANNELS_STEREO, AudioPacket::CHANNELS_STEREO,
AudioPacket::CHANNELS_STEREO, AudioPacket::CHANNELS_MONO,
AudioPacket::CHANNELS_MONO, AudioPacket::CHANNELS_MONO,
AudioPacket::CHANNELS_MONO,
});
for (size_t i = 0; i < std::size(kChannels); i++) {
source_->callback().Run(MakeAudioPacket(kChannels[i]));
// Run message loop to let the pump processes the audio packet and send it
// to the encoder.
base::RunLoop().RunUntilIdle();
// Call done closure to allow one more packet to be sent.
ASSERT_EQ(done_closures_.size(), 1U);
std::move(done_closures_.front()).Run();
done_closures_.pop_back();
base::RunLoop().RunUntilIdle();
}
ASSERT_EQ(sent_packets_.size(), std::size(kChannels));
}
} // namespace remoting::protocol
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