blob: 16eb8a35c903970a65032392c27afcc62a951d1f [file] [log] [blame]
/*
* 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 <memory>
#include <string>
#include "absl/memory/memory.h"
#include "api/task_queue/default_task_queue_factory.h"
#include "call/rtp_transport_controller_send.h"
#include "call/rtp_video_sender.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_packet.h"
#include "modules/video_coding/fec_controller_default.h"
#include "modules/video_coding/include/video_codec_interface.h"
#include "rtc_base/event.h"
#include "rtc_base/rate_limiter.h"
#include "test/field_trial.h"
#include "test/gmock.h"
#include "test/gtest.h"
#include "test/mock_transport.h"
#include "video/call_stats.h"
#include "video/send_delay_stats.h"
#include "video/send_statistics_proxy.h"
using ::testing::_;
using ::testing::Invoke;
using ::testing::NiceMock;
using ::testing::SaveArg;
using ::testing::Unused;
namespace webrtc {
namespace {
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;
class MockRtcpIntraFrameObserver : public RtcpIntraFrameObserver {
public:
MOCK_METHOD1(OnReceivedIntraFrameRequest, void(uint32_t));
};
RtpSenderObservers CreateObservers(
RtcpRttStats* rtcp_rtt_stats,
RtcpIntraFrameObserver* intra_frame_callback,
RtcpStatisticsCallback* rtcp_stats,
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.rtcp_stats = rtcp_stats;
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);
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)
: clock_(1000000),
config_(CreateVideoSendStreamConfig(&transport_,
ssrcs,
rtx_ssrcs,
payload_type)),
send_delay_stats_(&clock_),
bitrate_config_(GetBitrateConfig()),
task_queue_factory_(CreateDefaultTaskQueueFactory()),
transport_controller_(&clock_,
&event_log_,
nullptr,
nullptr,
bitrate_config_,
ProcessThread::Create("PacerThread"),
task_queue_factory_.get()),
process_thread_(ProcessThread::Create("test_thread")),
call_stats_(&clock_, process_thread_.get()),
stats_proxy_(&clock_,
config_,
VideoEncoderConfig::ContentType::kRealtimeVideo),
retransmission_rate_limiter_(&clock_, kRetransmitWindowSizeMs) {
std::map<uint32_t, RtpState> suspended_ssrcs;
router_ = absl::make_unique<RtpVideoSender>(
&clock_, suspended_ssrcs, suspended_payload_states, config_.rtp,
config_.rtcp_report_interval_ms, &transport_,
CreateObservers(&call_stats_, &encoder_feedback_, &stats_proxy_,
&stats_proxy_, &stats_proxy_, &stats_proxy_,
frame_count_observer, &stats_proxy_, &stats_proxy_,
&send_delay_stats_),
&transport_controller_, &event_log_, &retransmission_rate_limiter_,
absl::make_unique<FecControllerDefault>(&clock_), nullptr,
CryptoOptions{});
}
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)
: RtpVideoSenderTestFixture(ssrcs,
rtx_ssrcs,
payload_type,
suspended_payload_states,
/*frame_count_observer=*/nullptr) {}
RtpVideoSender* router() { return router_.get(); }
MockTransport& transport() { return transport_; }
SimulatedClock& clock() { return clock_; }
private:
NiceMock<MockTransport> transport_;
NiceMock<MockRtcpIntraFrameObserver> encoder_feedback_;
SimulatedClock clock_;
RtcEventLogNullImpl event_log_;
VideoSendStream::Config config_;
SendDelayStats send_delay_stats_;
BitrateConstraints bitrate_config_;
const std::unique_ptr<TaskQueueFactory> task_queue_factory_;
RtpTransportControllerSend transport_controller_;
std::unique_ptr<ProcessThread> process_thread_;
CallStats call_stats_;
SendStatisticsProxy stats_proxy_;
RateLimiter retransmission_rate_limiter_;
std::unique_ptr<RtpVideoSender> router_;
};
} // 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.Allocate(1);
encoded_image.data()[0] = kPayload;
encoded_image.set_size(1);
RtpVideoSenderTestFixture test({kSsrc1}, {kRtxSsrc1}, kPayloadType, {});
EXPECT_NE(
EncodedImageCallback::Result::OK,
test.router()->OnEncodedImage(encoded_image, nullptr, nullptr).error);
test.router()->SetActive(true);
EXPECT_EQ(
EncodedImageCallback::Result::OK,
test.router()->OnEncodedImage(encoded_image, nullptr, nullptr).error);
test.router()->SetActive(false);
EXPECT_NE(
EncodedImageCallback::Result::OK,
test.router()->OnEncodedImage(encoded_image, nullptr, nullptr).error);
test.router()->SetActive(true);
EXPECT_EQ(
EncodedImageCallback::Result::OK,
test.router()->OnEncodedImage(encoded_image, nullptr, 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.Allocate(1);
encoded_image_1.data()[0] = kPayload;
encoded_image_1.set_size(1);
RtpVideoSenderTestFixture test({kSsrc1, kSsrc2}, {kRtxSsrc1, kRtxSsrc2},
kPayloadType, {});
CodecSpecificInfo codec_info;
codec_info.codecType = kVideoCodecVP8;
test.router()->SetActive(true);
EXPECT_EQ(EncodedImageCallback::Result::OK,
test.router()
->OnEncodedImage(encoded_image_1, &codec_info, nullptr)
.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, nullptr)
.error);
// Inactive.
test.router()->SetActive(false);
EXPECT_NE(EncodedImageCallback::Result::OK,
test.router()
->OnEncodedImage(encoded_image_1, &codec_info, nullptr)
.error);
EXPECT_NE(EncodedImageCallback::Result::OK,
test.router()
->OnEncodedImage(encoded_image_2, &codec_info, nullptr)
.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.Allocate(1);
encoded_image_1.data()[0] = kPayload;
encoded_image_1.set_size(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.router()->SetActiveModules(active_modules);
EXPECT_EQ(EncodedImageCallback::Result::OK,
test.router()
->OnEncodedImage(encoded_image_1, &codec_info, nullptr)
.error);
// Setting both streams to inactive will turn the payload router to
// inactive.
active_modules = {false, false};
test.router()->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, nullptr)
.error);
EXPECT_NE(EncodedImageCallback::Result::OK,
test.router()
->OnEncodedImage(encoded_image_1, &codec_info, nullptr)
.error);
}
TEST(RtpVideoSenderTest, CreateWithNoPreviousStates) {
RtpVideoSenderTestFixture test({kSsrc1, kSsrc2}, {kRtxSsrc1, kRtxSsrc2},
kPayloadType, {});
test.router()->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.router()->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_METHOD2(FrameCountUpdated,
void(const FrameCounts& frame_counts, uint32_t ssrc));
} 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.Allocate(1);
encoded_image.data()[0] = kPayload;
encoded_image.set_size(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, nullptr).error);
::testing::Mock::VerifyAndClearExpectations(&callback);
test.router()->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, 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, 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) {
const int64_t kTimeoutMs = 500;
RtpVideoSenderTestFixture test({kSsrc1, kSsrc2}, {kRtxSsrc1, kRtxSsrc2},
kPayloadType, {});
test.router()->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.Allocate(1);
encoded_image.data()[0] = kPayload;
encoded_image.set_size(1);
// Send two tiny images, mapping to two RTP packets. Capture sequence numbers.
rtc::Event event;
std::vector<uint16_t> rtp_sequence_numbers;
std::vector<uint16_t> transport_sequence_numbers;
EXPECT_CALL(test.transport(), SendRtp)
.Times(2)
.WillRepeatedly(
[&event, &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);
if (transport_sequence_numbers.size() == 2) {
event.Set();
}
return true;
});
EXPECT_EQ(
EncodedImageCallback::Result::OK,
test.router()->OnEncodedImage(encoded_image, nullptr, nullptr).error);
encoded_image.SetTimestamp(2);
encoded_image.capture_time_ms_ = 3;
EXPECT_EQ(
EncodedImageCallback::Result::OK,
test.router()->OnEncodedImage(encoded_image, nullptr, nullptr).error);
const int64_t send_time_ms = test.clock().TimeInMilliseconds();
test.clock().AdvanceTimeMilliseconds(33);
ASSERT_TRUE(event.Wait(kTimeoutMs));
// 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([&event, &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()));
if (retransmitted_rtp_sequence_numbers.size() == 2) {
event.Set();
}
return true;
});
test.router()->DeliverRtcp(nack_buffer.data(), nack_buffer.size());
ASSERT_TRUE(event.Wait(kTimeoutMs));
// 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.
PacketFeedback received_packet_feedback(test.clock().TimeInMilliseconds(),
transport_sequence_numbers[0]);
received_packet_feedback.rtp_sequence_number = rtp_sequence_numbers[0];
received_packet_feedback.ssrc = kSsrc1;
received_packet_feedback.send_time_ms = send_time_ms;
PacketFeedback lost_packet_feedback(PacketFeedback::kNotReceived,
transport_sequence_numbers[1]);
lost_packet_feedback.rtp_sequence_number = rtp_sequence_numbers[1];
lost_packet_feedback.ssrc = kSsrc1;
lost_packet_feedback.send_time_ms = send_time_ms;
std::vector<PacketFeedback> feedback_vector = {received_packet_feedback,
lost_packet_feedback};
test.router()->OnPacketFeedbackVector(feedback_vector);
// 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.clock().AdvanceTimeMilliseconds(33);
EXPECT_CALL(test.transport(), SendRtp)
.WillOnce([&event, &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()));
event.Set();
return true;
});
test.router()->DeliverRtcp(nack_buffer.data(), nack_buffer.size());
ASSERT_TRUE(event.Wait(kTimeoutMs));
}
// Integration test verifying that retransmissions are sent for packets which
// can be detected as lost early, using transport wide feedback.
TEST(RtpVideoSenderTest, EarlyRetransmits) {
const int64_t kTimeoutMs = 500;
RtpVideoSenderTestFixture test({kSsrc1, kSsrc2}, {kRtxSsrc1, kRtxSsrc2},
kPayloadType, {});
test.router()->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.Allocate(1);
encoded_image.data()[0] = kPayload;
encoded_image.set_size(1);
encoded_image.SetSpatialIndex(0);
CodecSpecificInfo codec_specific;
codec_specific.codecType = VideoCodecType::kVideoCodecGeneric;
// Send two tiny images, mapping to single RTP packets. Capture sequence
// numbers.
rtc::Event event;
uint16_t frame1_rtp_sequence_number = 0;
uint16_t frame1_transport_sequence_number = 0;
EXPECT_CALL(test.transport(), SendRtp)
.WillOnce([&event, &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);
event.Set();
return true;
});
EXPECT_EQ(test.router()
->OnEncodedImage(encoded_image, &codec_specific, nullptr)
.error,
EncodedImageCallback::Result::OK);
const int64_t send_time_ms = test.clock().TimeInMilliseconds();
test.clock().AdvanceTimeMilliseconds(33);
ASSERT_TRUE(event.Wait(kTimeoutMs));
uint16_t frame2_rtp_sequence_number = 0;
uint16_t frame2_transport_sequence_number = 0;
encoded_image.SetSpatialIndex(1);
EXPECT_CALL(test.transport(), SendRtp)
.WillOnce([&event, &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);
event.Set();
return true;
});
EXPECT_EQ(test.router()
->OnEncodedImage(encoded_image, &codec_specific, nullptr)
.error,
EncodedImageCallback::Result::OK);
test.clock().AdvanceTimeMilliseconds(33);
ASSERT_TRUE(event.Wait(kTimeoutMs));
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([&event, &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(), kRtxSsrc2);
// 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);
event.Set();
return true;
});
PacketFeedback first_packet_feedback(PacketFeedback::kNotReceived,
frame1_transport_sequence_number);
first_packet_feedback.rtp_sequence_number = frame1_rtp_sequence_number;
first_packet_feedback.ssrc = kSsrc1;
first_packet_feedback.send_time_ms = send_time_ms;
PacketFeedback second_packet_feedback(test.clock().TimeInMilliseconds(),
frame2_transport_sequence_number);
first_packet_feedback.rtp_sequence_number = frame2_rtp_sequence_number;
first_packet_feedback.ssrc = kSsrc2;
first_packet_feedback.send_time_ms = send_time_ms + 33;
std::vector<PacketFeedback> feedback_vector = {first_packet_feedback,
second_packet_feedback};
test.router()->OnPacketFeedbackVector(feedback_vector);
// Wait for pacer to run and send the RTX packet.
test.clock().AdvanceTimeMilliseconds(33);
ASSERT_TRUE(event.Wait(kTimeoutMs));
}
} // namespace webrtc