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rtp_video_sender_unittest.cc
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/*
* Copyright (c) 2015 The WebRTC project authors. All Rights Reserved.
*
* Use of this source code is governed by a BSD-style license
* that can be found in the LICENSE file in the root of the source
* tree. An additional intellectual property rights grant can be found
* in the file PATENTS. All contributing project authors may
* be found in the AUTHORS file in the root of the source tree.
*/
#include "call/rtp_video_sender.h"
#include <atomic>
#include <memory>
#include <string>
#include <utility>
#include "absl/functional/any_invocable.h"
#include "call/rtp_transport_controller_send.h"
#include "modules/rtp_rtcp/include/rtp_rtcp_defines.h"
#include "modules/rtp_rtcp/source/byte_io.h"
#include "modules/rtp_rtcp/source/rtcp_packet/nack.h"
#include "modules/rtp_rtcp/source/rtp_dependency_descriptor_extension.h"
#include "modules/rtp_rtcp/source/rtp_packet.h"
#include "modules/video_coding/fec_controller_default.h"
#include "modules/video_coding/include/video_codec_interface.h"
#include "rtc_base/rate_limiter.h"
#include "test/gmock.h"
#include "test/gtest.h"
#include "test/mock_frame_transformer.h"
#include "test/mock_transport.h"
#include "test/scenario/scenario.h"
#include "test/scoped_key_value_config.h"
#include "test/time_controller/simulated_time_controller.h"
#include "video/send_delay_stats.h"
#include "video/send_statistics_proxy.h"
namespace webrtc {
namespace {
using ::testing::_;
using ::testing::NiceMock;
using ::testing::SaveArg;
using ::testing::SizeIs;
const int8_t kPayloadType = 96;
const uint32_t kSsrc1 = 12345;
const uint32_t kSsrc2 = 23456;
const uint32_t kRtxSsrc1 = 34567;
const uint32_t kRtxSsrc2 = 45678;
const int16_t kInitialPictureId1 = 222;
const int16_t kInitialPictureId2 = 44;
const int16_t kInitialTl0PicIdx1 = 99;
const int16_t kInitialTl0PicIdx2 = 199;
const int64_t kRetransmitWindowSizeMs = 500;
const int kTransportsSequenceExtensionId = 7;
const int kDependencyDescriptorExtensionId = 8;
class MockRtcpIntraFrameObserver : public RtcpIntraFrameObserver {
public:
MOCK_METHOD(void, OnReceivedIntraFrameRequest, (uint32_t), (override));
};
RtpSenderObservers CreateObservers(
RtcpRttStats* rtcp_rtt_stats,
RtcpIntraFrameObserver* intra_frame_callback,
ReportBlockDataObserver* report_block_data_observer,
StreamDataCountersCallback* rtp_stats,
BitrateStatisticsObserver* bitrate_observer,
FrameCountObserver* frame_count_observer,
RtcpPacketTypeCounterObserver* rtcp_type_observer,
SendSideDelayObserver* send_delay_observer,
SendPacketObserver* send_packet_observer) {
RtpSenderObservers observers;
observers.rtcp_rtt_stats = rtcp_rtt_stats;
observers.intra_frame_callback = intra_frame_callback;
observers.rtcp_loss_notification_observer = nullptr;
observers.report_block_data_observer = report_block_data_observer;
observers.rtp_stats = rtp_stats;
observers.bitrate_observer = bitrate_observer;
observers.frame_count_observer = frame_count_observer;
observers.rtcp_type_observer = rtcp_type_observer;
observers.send_delay_observer = send_delay_observer;
observers.send_packet_observer = send_packet_observer;
return observers;
}
BitrateConstraints GetBitrateConfig() {
BitrateConstraints bitrate_config;
bitrate_config.min_bitrate_bps = 30000;
bitrate_config.start_bitrate_bps = 300000;
bitrate_config.max_bitrate_bps = 3000000;
return bitrate_config;
}
VideoSendStream::Config CreateVideoSendStreamConfig(
Transport* transport,
const std::vector<uint32_t>& ssrcs,
const std::vector<uint32_t>& rtx_ssrcs,
int payload_type) {
VideoSendStream::Config config(transport);
config.rtp.ssrcs = ssrcs;
config.rtp.rtx.ssrcs = rtx_ssrcs;
config.rtp.payload_type = payload_type;
config.rtp.rtx.payload_type = payload_type + 1;
config.rtp.nack.rtp_history_ms = 1000;
config.rtp.extensions.emplace_back(RtpExtension::kTransportSequenceNumberUri,
kTransportsSequenceExtensionId);
config.rtp.extensions.emplace_back(RtpDependencyDescriptorExtension::Uri(),
kDependencyDescriptorExtensionId);
config.rtp.extmap_allow_mixed = true;
return config;
}
class RtpVideoSenderTestFixture {
public:
RtpVideoSenderTestFixture(
const std::vector<uint32_t>& ssrcs,
const std::vector<uint32_t>& rtx_ssrcs,
int payload_type,
const std::map<uint32_t, RtpPayloadState>& suspended_payload_states,
FrameCountObserver* frame_count_observer,
rtc::scoped_refptr<FrameTransformerInterface> frame_transformer,
const FieldTrialsView* field_trials = nullptr)
: time_controller_(Timestamp::Millis(1000000)),
config_(CreateVideoSendStreamConfig(&transport_,
ssrcs,
rtx_ssrcs,
payload_type)),
send_delay_stats_(time_controller_.GetClock()),
bitrate_config_(GetBitrateConfig()),
transport_controller_(time_controller_.GetClock(),
&event_log_,
nullptr,
nullptr,
bitrate_config_,
time_controller_.GetTaskQueueFactory(),
field_trials ? *field_trials : field_trials_),
stats_proxy_(time_controller_.GetClock(),
config_,
VideoEncoderConfig::ContentType::kRealtimeVideo,
field_trials ? *field_trials : field_trials_),
retransmission_rate_limiter_(time_controller_.GetClock(),
kRetransmitWindowSizeMs) {
transport_controller_.EnsureStarted();
std::map<uint32_t, RtpState> suspended_ssrcs;
router_ = std::make_unique<RtpVideoSender>(
time_controller_.GetClock(), suspended_ssrcs, suspended_payload_states,
config_.rtp, config_.rtcp_report_interval_ms, &transport_,
CreateObservers(nullptr, &encoder_feedback_, &stats_proxy_,
&stats_proxy_, &stats_proxy_, frame_count_observer,
&stats_proxy_, &stats_proxy_, &send_delay_stats_),
&transport_controller_, &event_log_, &retransmission_rate_limiter_,
std::make_unique<FecControllerDefault>(time_controller_.GetClock()),
nullptr, CryptoOptions{}, frame_transformer,
field_trials ? *field_trials : field_trials_);
}
RtpVideoSenderTestFixture(
const std::vector<uint32_t>& ssrcs,
const std::vector<uint32_t>& rtx_ssrcs,
int payload_type,
const std::map<uint32_t, RtpPayloadState>& suspended_payload_states,
FrameCountObserver* frame_count_observer,
const FieldTrialsView* field_trials = nullptr)
: RtpVideoSenderTestFixture(ssrcs,
rtx_ssrcs,
payload_type,
suspended_payload_states,
frame_count_observer,
/*frame_transformer=*/nullptr,
field_trials) {}
RtpVideoSenderTestFixture(
const std::vector<uint32_t>& ssrcs,
const std::vector<uint32_t>& rtx_ssrcs,
int payload_type,
const std::map<uint32_t, RtpPayloadState>& suspended_payload_states,
const FieldTrialsView* field_trials = nullptr)
: RtpVideoSenderTestFixture(ssrcs,
rtx_ssrcs,
payload_type,
suspended_payload_states,
/*frame_count_observer=*/nullptr,
/*frame_transformer=*/nullptr,
field_trials) {}
~RtpVideoSenderTestFixture() { SetActive(false); }
RtpVideoSender* router() { return router_.get(); }
MockTransport& transport() { return transport_; }
void AdvanceTime(TimeDelta delta) { time_controller_.AdvanceTime(delta); }
void SetActive(bool active) {
RunOnTransportQueue([&]() { router_->SetActive(active); });
}
void SetActiveModules(const std::vector<bool>& active_modules) {
RunOnTransportQueue([&]() { router_->SetActiveModules(active_modules); });
}
// Several RtpVideoSender methods expect to be called on the task queue as
// owned by the send transport. While the SequenceChecker may pick up the
// default thread as the transport queue, explicit checks for the transport
// queue (not just using a SequenceChecker) aren't possible unless such a
// queue is actually active. So RunOnTransportQueue is a convenience function
// that allow for running a `task` on the transport queue, similar to
// SendTask().
void RunOnTransportQueue(absl::AnyInvocable<void() &&> task) {
transport_controller_.GetWorkerQueue()->PostTask(std::move(task));
AdvanceTime(TimeDelta::Zero());
}
private:
test::ScopedKeyValueConfig field_trials_;
NiceMock<MockTransport> transport_;
NiceMock<MockRtcpIntraFrameObserver> encoder_feedback_;
GlobalSimulatedTimeController time_controller_;
RtcEventLogNull event_log_;
VideoSendStream::Config config_;
SendDelayStats send_delay_stats_;
BitrateConstraints bitrate_config_;
RtpTransportControllerSend transport_controller_;
SendStatisticsProxy stats_proxy_;
RateLimiter retransmission_rate_limiter_;
std::unique_ptr<RtpVideoSender> router_;
};
BitrateAllocationUpdate CreateBitrateAllocationUpdate(int target_bitrate_bps) {
BitrateAllocationUpdate update;
update.target_bitrate = DataRate::BitsPerSec(target_bitrate_bps);
update.round_trip_time = TimeDelta::Zero();
return update;
}
} // namespace
TEST(RtpVideoSenderTest, SendOnOneModule) {
constexpr uint8_t kPayload = 'a';
EncodedImage encoded_image;
encoded_image.SetTimestamp(1);
encoded_image.capture_time_ms_ = 2;
encoded_image._frameType = VideoFrameType::kVideoFrameKey;
encoded_image.SetEncodedData(EncodedImageBuffer::Create(&kPayload, 1));
RtpVideoSenderTestFixture test({kSsrc1}, {kRtxSsrc1}, kPayloadType, {});
EXPECT_NE(EncodedImageCallback::Result::OK,
test.router()->OnEncodedImage(encoded_image, nullptr).error);
test.SetActive(true);
EXPECT_EQ(EncodedImageCallback::Result::OK,
test.router()->OnEncodedImage(encoded_image, nullptr).error);
test.SetActive(false);
EXPECT_NE(EncodedImageCallback::Result::OK,
test.router()->OnEncodedImage(encoded_image, nullptr).error);
test.SetActive(true);
EXPECT_EQ(EncodedImageCallback::Result::OK,
test.router()->OnEncodedImage(encoded_image, nullptr).error);
}
TEST(RtpVideoSenderTest, SendSimulcastSetActive) {
constexpr uint8_t kPayload = 'a';
EncodedImage encoded_image_1;
encoded_image_1.SetTimestamp(1);
encoded_image_1.capture_time_ms_ = 2;
encoded_image_1._frameType = VideoFrameType::kVideoFrameKey;
encoded_image_1.SetEncodedData(EncodedImageBuffer::Create(&kPayload, 1));
RtpVideoSenderTestFixture test({kSsrc1, kSsrc2}, {kRtxSsrc1, kRtxSsrc2},
kPayloadType, {});
CodecSpecificInfo codec_info;
codec_info.codecType = kVideoCodecVP8;
test.SetActive(true);
EXPECT_EQ(EncodedImageCallback::Result::OK,
test.router()->OnEncodedImage(encoded_image_1, &codec_info).error);
EncodedImage encoded_image_2(encoded_image_1);
encoded_image_2.SetSpatialIndex(1);
EXPECT_EQ(EncodedImageCallback::Result::OK,
test.router()->OnEncodedImage(encoded_image_2, &codec_info).error);
// Inactive.
test.SetActive(false);
EXPECT_NE(EncodedImageCallback::Result::OK,
test.router()->OnEncodedImage(encoded_image_1, &codec_info).error);
EXPECT_NE(EncodedImageCallback::Result::OK,
test.router()->OnEncodedImage(encoded_image_2, &codec_info).error);
}
// Tests how setting individual rtp modules to active affects the overall
// behavior of the payload router. First sets one module to active and checks
// that outgoing data can be sent on this module, and checks that no data can
// be sent if both modules are inactive.
TEST(RtpVideoSenderTest, SendSimulcastSetActiveModules) {
constexpr uint8_t kPayload = 'a';
EncodedImage encoded_image_1;
encoded_image_1.SetTimestamp(1);
encoded_image_1.capture_time_ms_ = 2;
encoded_image_1._frameType = VideoFrameType::kVideoFrameKey;
encoded_image_1.SetEncodedData(EncodedImageBuffer::Create(&kPayload, 1));
EncodedImage encoded_image_2(encoded_image_1);
encoded_image_2.SetSpatialIndex(1);
RtpVideoSenderTestFixture test({kSsrc1, kSsrc2}, {kRtxSsrc1, kRtxSsrc2},
kPayloadType, {});
CodecSpecificInfo codec_info;
codec_info.codecType = kVideoCodecVP8;
// Only setting one stream to active will still set the payload router to
// active and allow sending data on the active stream.
std::vector<bool> active_modules({true, false});
test.SetActiveModules(active_modules);
EXPECT_EQ(EncodedImageCallback::Result::OK,
test.router()->OnEncodedImage(encoded_image_1, &codec_info).error);
// Setting both streams to inactive will turn the payload router to
// inactive.
active_modules = {false, false};
test.SetActiveModules(active_modules);
// An incoming encoded image will not ask the module to send outgoing data
// because the payload router is inactive.
EXPECT_NE(EncodedImageCallback::Result::OK,
test.router()->OnEncodedImage(encoded_image_1, &codec_info).error);
EXPECT_NE(EncodedImageCallback::Result::OK,
test.router()->OnEncodedImage(encoded_image_1, &codec_info).error);
}
TEST(
RtpVideoSenderTest,
DiscardsHigherSpatialVideoFramesAfterLayerDisabledInVideoLayersAllocation) {
constexpr uint8_t kPayload = 'a';
EncodedImage encoded_image_1;
encoded_image_1.SetTimestamp(1);
encoded_image_1.capture_time_ms_ = 2;
encoded_image_1._frameType = VideoFrameType::kVideoFrameKey;
encoded_image_1.SetEncodedData(EncodedImageBuffer::Create(&kPayload, 1));
EncodedImage encoded_image_2(encoded_image_1);
encoded_image_2.SetSpatialIndex(1);
CodecSpecificInfo codec_info;
codec_info.codecType = kVideoCodecVP8;
RtpVideoSenderTestFixture test({kSsrc1, kSsrc2}, {kRtxSsrc1, kRtxSsrc2},
kPayloadType, {});
test.SetActiveModules({true, true});
// A layer is sent on both rtp streams.
test.router()->OnVideoLayersAllocationUpdated(
{.active_spatial_layers = {{.rtp_stream_index = 0},
{.rtp_stream_index = 1}}});
EXPECT_EQ(EncodedImageCallback::Result::OK,
test.router()->OnEncodedImage(encoded_image_1, &codec_info).error);
EXPECT_EQ(EncodedImageCallback::Result::OK,
test.router()->OnEncodedImage(encoded_image_2, &codec_info).error);
// Only rtp stream index 0 is configured to send a stream.
test.router()->OnVideoLayersAllocationUpdated(
{.active_spatial_layers = {{.rtp_stream_index = 0}}});
EXPECT_EQ(EncodedImageCallback::Result::OK,
test.router()->OnEncodedImage(encoded_image_1, &codec_info).error);
EXPECT_NE(EncodedImageCallback::Result::OK,
test.router()->OnEncodedImage(encoded_image_2, &codec_info).error);
}
TEST(RtpVideoSenderTest, CreateWithNoPreviousStates) {
RtpVideoSenderTestFixture test({kSsrc1, kSsrc2}, {kRtxSsrc1, kRtxSsrc2},
kPayloadType, {});
test.SetActive(true);
std::map<uint32_t, RtpPayloadState> initial_states =
test.router()->GetRtpPayloadStates();
EXPECT_EQ(2u, initial_states.size());
EXPECT_NE(initial_states.find(kSsrc1), initial_states.end());
EXPECT_NE(initial_states.find(kSsrc2), initial_states.end());
}
TEST(RtpVideoSenderTest, CreateWithPreviousStates) {
const int64_t kState1SharedFrameId = 123;
const int64_t kState2SharedFrameId = 234;
RtpPayloadState state1;
state1.picture_id = kInitialPictureId1;
state1.tl0_pic_idx = kInitialTl0PicIdx1;
state1.shared_frame_id = kState1SharedFrameId;
RtpPayloadState state2;
state2.picture_id = kInitialPictureId2;
state2.tl0_pic_idx = kInitialTl0PicIdx2;
state2.shared_frame_id = kState2SharedFrameId;
std::map<uint32_t, RtpPayloadState> states = {{kSsrc1, state1},
{kSsrc2, state2}};
RtpVideoSenderTestFixture test({kSsrc1, kSsrc2}, {kRtxSsrc1, kRtxSsrc2},
kPayloadType, states);
test.SetActive(true);
std::map<uint32_t, RtpPayloadState> initial_states =
test.router()->GetRtpPayloadStates();
EXPECT_EQ(2u, initial_states.size());
EXPECT_EQ(kInitialPictureId1, initial_states[kSsrc1].picture_id);
EXPECT_EQ(kInitialTl0PicIdx1, initial_states[kSsrc1].tl0_pic_idx);
EXPECT_EQ(kInitialPictureId2, initial_states[kSsrc2].picture_id);
EXPECT_EQ(kInitialTl0PicIdx2, initial_states[kSsrc2].tl0_pic_idx);
EXPECT_EQ(kState2SharedFrameId, initial_states[kSsrc1].shared_frame_id);
EXPECT_EQ(kState2SharedFrameId, initial_states[kSsrc2].shared_frame_id);
}
TEST(RtpVideoSenderTest, FrameCountCallbacks) {
class MockFrameCountObserver : public FrameCountObserver {
public:
MOCK_METHOD(void,
FrameCountUpdated,
(const FrameCounts& frame_counts, uint32_t ssrc),
(override));
} callback;
RtpVideoSenderTestFixture test({kSsrc1}, {kRtxSsrc1}, kPayloadType, {},
&callback);
constexpr uint8_t kPayload = 'a';
EncodedImage encoded_image;
encoded_image.SetTimestamp(1);
encoded_image.capture_time_ms_ = 2;
encoded_image._frameType = VideoFrameType::kVideoFrameKey;
encoded_image.SetEncodedData(EncodedImageBuffer::Create(&kPayload, 1));
encoded_image._frameType = VideoFrameType::kVideoFrameKey;
// No callbacks when not active.
EXPECT_CALL(callback, FrameCountUpdated).Times(0);
EXPECT_NE(EncodedImageCallback::Result::OK,
test.router()->OnEncodedImage(encoded_image, nullptr).error);
::testing::Mock::VerifyAndClearExpectations(&callback);
test.SetActive(true);
FrameCounts frame_counts;
EXPECT_CALL(callback, FrameCountUpdated(_, kSsrc1))
.WillOnce(SaveArg<0>(&frame_counts));
EXPECT_EQ(EncodedImageCallback::Result::OK,
test.router()->OnEncodedImage(encoded_image, nullptr).error);
EXPECT_EQ(1, frame_counts.key_frames);
EXPECT_EQ(0, frame_counts.delta_frames);
::testing::Mock::VerifyAndClearExpectations(&callback);
encoded_image._frameType = VideoFrameType::kVideoFrameDelta;
EXPECT_CALL(callback, FrameCountUpdated(_, kSsrc1))
.WillOnce(SaveArg<0>(&frame_counts));
EXPECT_EQ(EncodedImageCallback::Result::OK,
test.router()->OnEncodedImage(encoded_image, nullptr).error);
EXPECT_EQ(1, frame_counts.key_frames);
EXPECT_EQ(1, frame_counts.delta_frames);
}
// Integration test verifying that ack of packet via TransportFeedback means
// that the packet is removed from RtpPacketHistory and won't be retransmitted
// again.
TEST(RtpVideoSenderTest, DoesNotRetrasmitAckedPackets) {
RtpVideoSenderTestFixture test({kSsrc1, kSsrc2}, {kRtxSsrc1, kRtxSsrc2},
kPayloadType, {});
test.SetActive(true);
constexpr uint8_t kPayload = 'a';
EncodedImage encoded_image;
encoded_image.SetTimestamp(1);
encoded_image.capture_time_ms_ = 2;
encoded_image._frameType = VideoFrameType::kVideoFrameKey;
encoded_image.SetEncodedData(EncodedImageBuffer::Create(&kPayload, 1));
// Send two tiny images, mapping to two RTP packets. Capture sequence numbers.
std::vector<uint16_t> rtp_sequence_numbers;
std::vector<uint16_t> transport_sequence_numbers;
EXPECT_CALL(test.transport(), SendRtp)
.Times(2)
.WillRepeatedly([&rtp_sequence_numbers, &transport_sequence_numbers](
const uint8_t* packet, size_t length,
const PacketOptions& options) {
RtpPacket rtp_packet;
EXPECT_TRUE(rtp_packet.Parse(packet, length));
rtp_sequence_numbers.push_back(rtp_packet.SequenceNumber());
transport_sequence_numbers.push_back(options.packet_id);
return true;
});
EXPECT_EQ(EncodedImageCallback::Result::OK,
test.router()->OnEncodedImage(encoded_image, nullptr).error);
encoded_image.SetTimestamp(2);
encoded_image.capture_time_ms_ = 3;
EXPECT_EQ(EncodedImageCallback::Result::OK,
test.router()->OnEncodedImage(encoded_image, nullptr).error);
test.AdvanceTime(TimeDelta::Millis(33));
// Construct a NACK message for requesting retransmission of both packet.
rtcp::Nack nack;
nack.SetMediaSsrc(kSsrc1);
nack.SetPacketIds(rtp_sequence_numbers);
rtc::Buffer nack_buffer = nack.Build();
std::vector<uint16_t> retransmitted_rtp_sequence_numbers;
EXPECT_CALL(test.transport(), SendRtp)
.Times(2)
.WillRepeatedly([&retransmitted_rtp_sequence_numbers](
const uint8_t* packet, size_t length,
const PacketOptions& options) {
RtpPacket rtp_packet;
EXPECT_TRUE(rtp_packet.Parse(packet, length));
EXPECT_EQ(rtp_packet.Ssrc(), kRtxSsrc1);
// Capture the retransmitted sequence number from the RTX header.
rtc::ArrayView<const uint8_t> payload = rtp_packet.payload();
retransmitted_rtp_sequence_numbers.push_back(
ByteReader<uint16_t>::ReadBigEndian(payload.data()));
return true;
});
test.router()->DeliverRtcp(nack_buffer.data(), nack_buffer.size());
test.AdvanceTime(TimeDelta::Millis(33));
// Verify that both packets were retransmitted.
EXPECT_EQ(retransmitted_rtp_sequence_numbers, rtp_sequence_numbers);
// Simulate transport feedback indicating fist packet received, next packet
// lost (not other way around as that would trigger early retransmit).
StreamFeedbackObserver::StreamPacketInfo lost_packet_feedback;
lost_packet_feedback.rtp_sequence_number = rtp_sequence_numbers[0];
lost_packet_feedback.ssrc = kSsrc1;
lost_packet_feedback.received = false;
lost_packet_feedback.is_retransmission = false;
StreamFeedbackObserver::StreamPacketInfo received_packet_feedback;
received_packet_feedback.rtp_sequence_number = rtp_sequence_numbers[1];
received_packet_feedback.ssrc = kSsrc1;
received_packet_feedback.received = true;
lost_packet_feedback.is_retransmission = false;
test.router()->OnPacketFeedbackVector(
{lost_packet_feedback, received_packet_feedback});
// Advance time to make sure retransmission would be allowed and try again.
// This time the retransmission should not happen for the first packet since
// the history has been notified of the ack and removed the packet. The
// second packet, included in the feedback but not marked as received, should
// still be retransmitted.
test.AdvanceTime(TimeDelta::Millis(33));
EXPECT_CALL(test.transport(), SendRtp)
.WillOnce([&lost_packet_feedback](const uint8_t* packet, size_t length,
const PacketOptions& options) {
RtpPacket rtp_packet;
EXPECT_TRUE(rtp_packet.Parse(packet, length));
EXPECT_EQ(rtp_packet.Ssrc(), kRtxSsrc1);
// Capture the retransmitted sequence number from the RTX header.
rtc::ArrayView<const uint8_t> payload = rtp_packet.payload();
EXPECT_EQ(lost_packet_feedback.rtp_sequence_number,
ByteReader<uint16_t>::ReadBigEndian(payload.data()));
return true;
});
test.router()->DeliverRtcp(nack_buffer.data(), nack_buffer.size());
test.AdvanceTime(TimeDelta::Millis(33));
}
// This tests that we utilize transport wide feedback to retransmit lost
// packets. This is tested by dropping all ordinary packets from a "lossy"
// stream sent along with a secondary untouched stream. The transport wide
// feedback packets from the secondary stream allows the sending side to
// detect and retreansmit the lost packets from the lossy stream.
TEST(RtpVideoSenderTest, RetransmitsOnTransportWideLossInfo) {
int rtx_packets;
test::Scenario s(test_info_);
test::CallClientConfig call_conf;
// Keeping the bitrate fixed to avoid RTX due to probing.
call_conf.transport.rates.max_rate = DataRate::KilobitsPerSec(300);
call_conf.transport.rates.start_rate = DataRate::KilobitsPerSec(300);
test::NetworkSimulationConfig net_conf;
net_conf.bandwidth = DataRate::KilobitsPerSec(300);
auto send_node = s.CreateSimulationNode(net_conf);
auto* callee = s.CreateClient("return", call_conf);
auto* route = s.CreateRoutes(s.CreateClient("send", call_conf), {send_node},
callee, {s.CreateSimulationNode(net_conf)});
test::VideoStreamConfig lossy_config;
lossy_config.source.framerate = 5;
auto* lossy = s.CreateVideoStream(route->forward(), lossy_config);
// The secondary stream acts a driver for transport feedback messages,
// ensuring that lost packets on the lossy stream are retransmitted.
s.CreateVideoStream(route->forward(), test::VideoStreamConfig());
send_node->router()->SetFilter([&](const EmulatedIpPacket& packet) {
RtpPacket rtp;
if (rtp.Parse(packet.data)) {
// Drops all regular packets for the lossy stream and counts all RTX
// packets. Since no packets are let trough, NACKs can't be triggered
// by the receiving side.
if (lossy->send()->UsingSsrc(rtp.Ssrc())) {
return false;
} else if (lossy->send()->UsingRtxSsrc(rtp.Ssrc())) {
++rtx_packets;
}
}
return true;
});
// Run for a short duration and reset counters to avoid counting RTX packets
// from initial probing.
s.RunFor(TimeDelta::Seconds(1));
rtx_packets = 0;
int decoded_baseline = 0;
callee->SendTask([&decoded_baseline, &lossy]() {
decoded_baseline = lossy->receive()->GetStats().frames_decoded;
});
s.RunFor(TimeDelta::Seconds(1));
// We expect both that RTX packets were sent and that an appropriate number of
// frames were received. This is somewhat redundant but reduces the risk of
// false positives in future regressions (e.g. RTX is send due to probing).
EXPECT_GE(rtx_packets, 1);
int frames_decoded = 0;
callee->SendTask([&decoded_baseline, &frames_decoded, &lossy]() {
frames_decoded =
lossy->receive()->GetStats().frames_decoded - decoded_baseline;
});
EXPECT_EQ(frames_decoded, 5);
}
// Integration test verifying that retransmissions are sent for packets which
// can be detected as lost early, using transport wide feedback.
TEST(RtpVideoSenderTest, EarlyRetransmits) {
RtpVideoSenderTestFixture test({kSsrc1, kSsrc2}, {kRtxSsrc1, kRtxSsrc2},
kPayloadType, {});
test.SetActive(true);
const uint8_t kPayload[1] = {'a'};
EncodedImage encoded_image;
encoded_image.SetTimestamp(1);
encoded_image.capture_time_ms_ = 2;
encoded_image._frameType = VideoFrameType::kVideoFrameKey;
encoded_image.SetEncodedData(
EncodedImageBuffer::Create(kPayload, sizeof(kPayload)));
encoded_image.SetSpatialIndex(0);
CodecSpecificInfo codec_specific;
codec_specific.codecType = VideoCodecType::kVideoCodecGeneric;
// Send two tiny images, mapping to single RTP packets. Capture sequence
// numbers.
uint16_t frame1_rtp_sequence_number = 0;
uint16_t frame1_transport_sequence_number = 0;
EXPECT_CALL(test.transport(), SendRtp)
.WillOnce(
[&frame1_rtp_sequence_number, &frame1_transport_sequence_number](
const uint8_t* packet, size_t length,
const PacketOptions& options) {
RtpPacket rtp_packet;
EXPECT_TRUE(rtp_packet.Parse(packet, length));
frame1_rtp_sequence_number = rtp_packet.SequenceNumber();
frame1_transport_sequence_number = options.packet_id;
EXPECT_EQ(rtp_packet.Ssrc(), kSsrc1);
return true;
});
EXPECT_EQ(test.router()->OnEncodedImage(encoded_image, &codec_specific).error,
EncodedImageCallback::Result::OK);
test.AdvanceTime(TimeDelta::Millis(33));
uint16_t frame2_rtp_sequence_number = 0;
uint16_t frame2_transport_sequence_number = 0;
encoded_image.SetSpatialIndex(1);
EXPECT_CALL(test.transport(), SendRtp)
.WillOnce(
[&frame2_rtp_sequence_number, &frame2_transport_sequence_number](
const uint8_t* packet, size_t length,
const PacketOptions& options) {
RtpPacket rtp_packet;
EXPECT_TRUE(rtp_packet.Parse(packet, length));
frame2_rtp_sequence_number = rtp_packet.SequenceNumber();
frame2_transport_sequence_number = options.packet_id;
EXPECT_EQ(rtp_packet.Ssrc(), kSsrc2);
return true;
});
EXPECT_EQ(test.router()->OnEncodedImage(encoded_image, &codec_specific).error,
EncodedImageCallback::Result::OK);
test.AdvanceTime(TimeDelta::Millis(33));
EXPECT_NE(frame1_transport_sequence_number, frame2_transport_sequence_number);
// Inject a transport feedback where the packet for the first frame is lost,
// expect a retransmission for it.
EXPECT_CALL(test.transport(), SendRtp)
.WillOnce([&frame1_rtp_sequence_number](const uint8_t* packet,
size_t length,
const PacketOptions& options) {
RtpPacket rtp_packet;
EXPECT_TRUE(rtp_packet.Parse(packet, length));
EXPECT_EQ(rtp_packet.Ssrc(), kRtxSsrc1);
// Retransmitted sequence number from the RTX header should match
// the lost packet.
rtc::ArrayView<const uint8_t> payload = rtp_packet.payload();
EXPECT_EQ(ByteReader<uint16_t>::ReadBigEndian(payload.data()),
frame1_rtp_sequence_number);
return true;
});
StreamFeedbackObserver::StreamPacketInfo first_packet_feedback;
first_packet_feedback.rtp_sequence_number = frame1_rtp_sequence_number;
first_packet_feedback.ssrc = kSsrc1;
first_packet_feedback.received = false;
first_packet_feedback.is_retransmission = false;
StreamFeedbackObserver::StreamPacketInfo second_packet_feedback;
second_packet_feedback.rtp_sequence_number = frame2_rtp_sequence_number;
second_packet_feedback.ssrc = kSsrc2;
second_packet_feedback.received = true;
first_packet_feedback.is_retransmission = false;
test.router()->OnPacketFeedbackVector(
{first_packet_feedback, second_packet_feedback});
// Wait for pacer to run and send the RTX packet.
test.AdvanceTime(TimeDelta::Millis(33));
}
TEST(RtpVideoSenderTest, SupportsDependencyDescriptor) {
RtpVideoSenderTestFixture test({kSsrc1}, {}, kPayloadType, {});
test.SetActive(true);
RtpHeaderExtensionMap extensions;
extensions.Register<RtpDependencyDescriptorExtension>(
kDependencyDescriptorExtensionId);
std::vector<RtpPacket> sent_packets;
ON_CALL(test.transport(), SendRtp)
.WillByDefault([&](const uint8_t* packet, size_t length,
const PacketOptions& options) {
sent_packets.emplace_back(&extensions);
EXPECT_TRUE(sent_packets.back().Parse(packet, length));
return true;
});
const uint8_t kPayload[1] = {'a'};
EncodedImage encoded_image;
encoded_image.SetTimestamp(1);
encoded_image.capture_time_ms_ = 2;
encoded_image.SetEncodedData(
EncodedImageBuffer::Create(kPayload, sizeof(kPayload)));
CodecSpecificInfo codec_specific;
codec_specific.codecType = VideoCodecType::kVideoCodecGeneric;
codec_specific.template_structure.emplace();
codec_specific.template_structure->num_decode_targets = 1;
codec_specific.template_structure->templates = {
FrameDependencyTemplate().T(0).Dtis("S"),
FrameDependencyTemplate().T(0).Dtis("S").FrameDiffs({2}),
FrameDependencyTemplate().T(1).Dtis("D").FrameDiffs({1}),
};
// Send two tiny images, mapping to single RTP packets.
// Send in key frame.
encoded_image._frameType = VideoFrameType::kVideoFrameKey;
codec_specific.generic_frame_info =
GenericFrameInfo::Builder().T(0).Dtis("S").Build();
codec_specific.generic_frame_info->encoder_buffers = {{0, false, true}};
EXPECT_EQ(test.router()->OnEncodedImage(encoded_image, &codec_specific).error,
EncodedImageCallback::Result::OK);
test.AdvanceTime(TimeDelta::Millis(33));
ASSERT_THAT(sent_packets, SizeIs(1));
EXPECT_TRUE(
sent_packets.back().HasExtension<RtpDependencyDescriptorExtension>());
// Send in delta frame.
encoded_image._frameType = VideoFrameType::kVideoFrameDelta;
codec_specific.template_structure = absl::nullopt;
codec_specific.generic_frame_info =
GenericFrameInfo::Builder().T(1).Dtis("D").Build();
codec_specific.generic_frame_info->encoder_buffers = {{0, true, false}};
EXPECT_EQ(test.router()->OnEncodedImage(encoded_image, &codec_specific).error,
EncodedImageCallback::Result::OK);
test.AdvanceTime(TimeDelta::Millis(33));
ASSERT_THAT(sent_packets, SizeIs(2));
EXPECT_TRUE(
sent_packets.back().HasExtension<RtpDependencyDescriptorExtension>());
}
TEST(RtpVideoSenderTest,
SupportsDependencyDescriptorForVp8NotProvidedByEncoder) {
constexpr uint8_t kPayload[1] = {'a'};
RtpVideoSenderTestFixture test({kSsrc1}, {}, kPayloadType, {});
RtpHeaderExtensionMap extensions;
extensions.Register<RtpDependencyDescriptorExtension>(
kDependencyDescriptorExtensionId);
std::vector<RtpPacket> sent_packets;
ON_CALL(test.transport(), SendRtp)
.WillByDefault(
[&](const uint8_t* packet, size_t length, const PacketOptions&) {
EXPECT_TRUE(
sent_packets.emplace_back(&extensions).Parse(packet, length));
return true;
});
test.SetActive(true);
EncodedImage key_frame_image;
key_frame_image._frameType = VideoFrameType::kVideoFrameKey;
key_frame_image.SetEncodedData(
EncodedImageBuffer::Create(kPayload, sizeof(kPayload)));
CodecSpecificInfo key_frame_info;
key_frame_info.codecType = VideoCodecType::kVideoCodecVP8;
ASSERT_EQ(
test.router()->OnEncodedImage(key_frame_image, &key_frame_info).error,
EncodedImageCallback::Result::OK);
EncodedImage delta_image;
delta_image._frameType = VideoFrameType::kVideoFrameDelta;
delta_image.SetEncodedData(
EncodedImageBuffer::Create(kPayload, sizeof(kPayload)));
CodecSpecificInfo delta_info;
delta_info.codecType = VideoCodecType::kVideoCodecVP8;
ASSERT_EQ(test.router()->OnEncodedImage(delta_image, &delta_info).error,
EncodedImageCallback::Result::OK);
test.AdvanceTime(TimeDelta::Millis(123));
DependencyDescriptor key_frame_dd;
DependencyDescriptor delta_dd;
ASSERT_THAT(sent_packets, SizeIs(2));
EXPECT_TRUE(sent_packets[0].GetExtension<RtpDependencyDescriptorExtension>(
/*structure=*/nullptr, &key_frame_dd));
EXPECT_TRUE(sent_packets[1].GetExtension<RtpDependencyDescriptorExtension>(
key_frame_dd.attached_structure.get(), &delta_dd));
}
TEST(RtpVideoSenderTest, SupportsDependencyDescriptorForVp9) {
RtpVideoSenderTestFixture test({kSsrc1}, {}, kPayloadType, {});
test.SetActive(true);
RtpHeaderExtensionMap extensions;
extensions.Register<RtpDependencyDescriptorExtension>(
kDependencyDescriptorExtensionId);
std::vector<RtpPacket> sent_packets;
ON_CALL(test.transport(), SendRtp)
.WillByDefault([&](const uint8_t* packet, size_t length,
const PacketOptions& options) {
sent_packets.emplace_back(&extensions);
EXPECT_TRUE(sent_packets.back().Parse(packet, length));
return true;
});
const uint8_t kPayload[1] = {'a'};
EncodedImage encoded_image;
encoded_image.SetTimestamp(1);
encoded_image.capture_time_ms_ = 2;
encoded_image._frameType = VideoFrameType::kVideoFrameKey;
encoded_image.SetEncodedData(
EncodedImageBuffer::Create(kPayload, sizeof(kPayload)));
CodecSpecificInfo codec_specific;
codec_specific.codecType = VideoCodecType::kVideoCodecVP9;
codec_specific.template_structure.emplace();
codec_specific.template_structure->num_decode_targets = 2;
codec_specific.template_structure->templates = {
FrameDependencyTemplate().S(0).Dtis("SS"),
FrameDependencyTemplate().S(1).Dtis("-S").FrameDiffs({1}),
};
// Send two tiny images, each mapping to single RTP packet.
// Send in key frame for the base spatial layer.
codec_specific.generic_frame_info =
GenericFrameInfo::Builder().S(0).Dtis("SS").Build();
codec_specific.generic_frame_info->encoder_buffers = {{0, false, true}};
EXPECT_EQ(test.router()->OnEncodedImage(encoded_image, &codec_specific).error,
EncodedImageCallback::Result::OK);
// Send in 2nd spatial layer.
codec_specific.template_structure = absl::nullopt;
codec_specific.generic_frame_info =
GenericFrameInfo::Builder().S(1).Dtis("-S").Build();
codec_specific.generic_frame_info->encoder_buffers = {{0, true, false},
{1, false, true}};
EXPECT_EQ(test.router()->OnEncodedImage(encoded_image, &codec_specific).error,
EncodedImageCallback::Result::OK);
test.AdvanceTime(TimeDelta::Millis(33));
ASSERT_THAT(sent_packets, SizeIs(2));
EXPECT_TRUE(sent_packets[0].HasExtension<RtpDependencyDescriptorExtension>());
EXPECT_TRUE(sent_packets[1].HasExtension<RtpDependencyDescriptorExtension>());
}
TEST(RtpVideoSenderTest,
SupportsDependencyDescriptorForVp9NotProvidedByEncoder) {
RtpVideoSenderTestFixture test({kSsrc1}, {}, kPayloadType, {});
test.SetActive(true);
RtpHeaderExtensionMap extensions;
extensions.Register<RtpDependencyDescriptorExtension>(
kDependencyDescriptorExtensionId);
std::vector<RtpPacket> sent_packets;
ON_CALL(test.transport(), SendRtp)
.WillByDefault([&](const uint8_t* packet, size_t length,
const PacketOptions& options) {
sent_packets.emplace_back(&extensions);
EXPECT_TRUE(sent_packets.back().Parse(packet, length));
return true;
});
const uint8_t kPayload[1] = {'a'};
EncodedImage encoded_image;
encoded_image.SetTimestamp(1);
encoded_image.capture_time_ms_ = 2;
encoded_image._frameType = VideoFrameType::kVideoFrameKey;
encoded_image._encodedWidth = 320;
encoded_image._encodedHeight = 180;
encoded_image.SetEncodedData(
EncodedImageBuffer::Create(kPayload, sizeof(kPayload)));
CodecSpecificInfo codec_specific;
codec_specific.codecType = VideoCodecType::kVideoCodecVP9;
codec_specific.codecSpecific.VP9.num_spatial_layers = 1;
codec_specific.codecSpecific.VP9.temporal_idx = kNoTemporalIdx;
codec_specific.codecSpecific.VP9.first_frame_in_picture = true;
codec_specific.end_of_picture = true;
codec_specific.codecSpecific.VP9.inter_pic_predicted = false;
// Send two tiny images, each mapping to single RTP packet.
EXPECT_EQ(test.router()->OnEncodedImage(encoded_image, &codec_specific).error,
EncodedImageCallback::Result::OK);
// Send in 2nd picture.
encoded_image._frameType = VideoFrameType::kVideoFrameDelta;
encoded_image.SetTimestamp(3000);
codec_specific.codecSpecific.VP9.inter_pic_predicted = true;
codec_specific.codecSpecific.VP9.num_ref_pics = 1;
codec_specific.codecSpecific.VP9.p_diff[0] = 1;
EXPECT_EQ(test.router()->OnEncodedImage(encoded_image, &codec_specific).error,
EncodedImageCallback::Result::OK);
test.AdvanceTime(TimeDelta::Millis(33));
ASSERT_THAT(sent_packets, SizeIs(2));
EXPECT_TRUE(sent_packets[0].HasExtension<RtpDependencyDescriptorExtension>());
EXPECT_TRUE(sent_packets[1].HasExtension<RtpDependencyDescriptorExtension>());
}
TEST(RtpVideoSenderTest, GenerateDependecyDescriptorForGenericCodecs) {
test::ScopedKeyValueConfig field_trials(
"WebRTC-GenericCodecDependencyDescriptor/Enabled/");
RtpVideoSenderTestFixture test({kSsrc1}, {}, kPayloadType, {}, &field_trials);
test.SetActive(true);
RtpHeaderExtensionMap extensions;
extensions.Register<RtpDependencyDescriptorExtension>(
kDependencyDescriptorExtensionId);
std::vector<RtpPacket> sent_packets;
ON_CALL(test.transport(), SendRtp)
.WillByDefault([&](const uint8_t* packet, size_t length,
const PacketOptions& options) {
sent_packets.emplace_back(&extensions);
EXPECT_TRUE(sent_packets.back().Parse(packet, length));
return true;
});
const uint8_t kPayload[1] = {'a'};
EncodedImage encoded_image;
encoded_image.SetTimestamp(1);
encoded_image.capture_time_ms_ = 2;
encoded_image._frameType = VideoFrameType::kVideoFrameKey;
encoded_image._encodedWidth = 320;
encoded_image._encodedHeight = 180;
encoded_image.SetEncodedData(
EncodedImageBuffer::Create(kPayload, sizeof(kPayload)));
CodecSpecificInfo codec_specific;
codec_specific.codecType = VideoCodecType::kVideoCodecGeneric;
codec_specific.end_of_picture = true;
// Send two tiny images, each mapping to single RTP packet.
EXPECT_EQ(test.router()->OnEncodedImage(encoded_image, &codec_specific).error,
EncodedImageCallback::Result::OK);
// Send in 2nd picture.
encoded_image._frameType = VideoFrameType::kVideoFrameDelta;
encoded_image.SetTimestamp(3000);
EXPECT_EQ(test.router()->OnEncodedImage(encoded_image, &codec_specific).error,
EncodedImageCallback::Result::OK);
test.AdvanceTime(TimeDelta::Millis(33));
ASSERT_THAT(sent_packets, SizeIs(2));
EXPECT_TRUE(sent_packets[0].HasExtension<RtpDependencyDescriptorExtension>());
EXPECT_TRUE(sent_packets[1].HasExtension<RtpDependencyDescriptorExtension>());
}
TEST(RtpVideoSenderTest, SupportsStoppingUsingDependencyDescriptor) {
RtpVideoSenderTestFixture test({kSsrc1}, {}, kPayloadType, {});
test.SetActive(true);
RtpHeaderExtensionMap extensions;
extensions.Register<RtpDependencyDescriptorExtension>(
kDependencyDescriptorExtensionId);
std::vector<RtpPacket> sent_packets;
ON_CALL(test.transport(), SendRtp)
.WillByDefault([&](const uint8_t* packet, size_t length,
const PacketOptions& options) {
sent_packets.emplace_back(&extensions);
EXPECT_TRUE(sent_packets.back().Parse(packet, length));
return true;