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Allowing buffering a LNTF (loss notification) feedback message in RTCPSender

Browse source 
Loss notifications may either be sent immediately, or wait until another
RTCP feedback message is sent.

Bug: webrtc:10336
Change-Id: I40601d9fa1dec6c17b2ce905cb0c8cd2dcff7893
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/139242
Commit-Queue: Elad Alon <eladalon@webrtc.org>
Reviewed-by: Karl Wiberg <kwiberg@webrtc.org>
Reviewed-by: Ilya Nikolaevskiy <ilnik@webrtc.org>
Reviewed-by: Danil Chapovalov <danilchap@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#28142}
This commit is contained in:
Elad Alon 2019-06-03 14:37:50 +02:00 committed by Commit Bot
parent 4e34c18c4b
commit e86af2c75f
17 changed files with 100 additions and 35 deletions
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1
DEPS
View file

@ -1633,6 +1633,7 @@ include_rules = [
"+absl/algorithm/container.h",
"+absl/base/attributes.h",
"+absl/base/config.h",
"+absl/base/macros.h",
"+absl/container/inlined_vector.h",
"+absl/memory/memory.h",
"+absl/meta/type_traits.h",

5
abseil-in-webrtc.md
View file

@ -22,8 +22,9 @@ adds the first use.
`absl::is_trivially_destructible` from `absl/meta/type_traits.h`.
* `absl::variant` and related stuff from `absl/types/variant.h`.
* The functions in `absl/algorithm/algorithm.h` and
`absl/algorithm/container.h`
* The macros in `absl/base/attributes.h` and `absl/base/config.h`
`absl/algorithm/container.h`.
* The macros in `absl/base/attributes.h`, `absl/base/config.h` and
`absl/base/macros.h`.
## **Disallowed**

3
modules/include/module_common_types.h
View file

@ -100,7 +100,8 @@ class LossNotificationSender {
virtual void SendLossNotification(uint16_t last_decoded_seq_num,
uint16_t last_received_seq_num,
bool decodability_flag) = 0;
bool decodability_flag,
bool buffering_allowed) = 0;
};
} // namespace webrtc

1
modules/rtp_rtcp/BUILD.gn
View file

@ -472,6 +472,7 @@ if (rtc_include_tests) {
"../../test:test_support",
"../video_coding:codec_globals_headers",
"//third_party/abseil-cpp/absl/algorithm:container",
"//third_party/abseil-cpp/absl/base:core_headers",
"//third_party/abseil-cpp/absl/memory",
"//third_party/abseil-cpp/absl/types:optional",
]

3
modules/rtp_rtcp/include/rtp_rtcp.h
View file

@ -435,7 +435,8 @@ class RtpRtcp : public Module, public RtcpFeedbackSenderInterface {
// Returns -1 on failure else 0.
virtual int32_t SendLossNotification(uint16_t last_decoded_seq_num,
uint16_t last_received_seq_num,
bool decodability_flag) = 0;
bool decodability_flag,
bool buffering_allowed) = 0;
};
} // namespace webrtc

5
modules/rtp_rtcp/mocks/mock_rtp_rtcp.h
View file

@ -151,10 +151,11 @@ class MockRtpRtcp : public RtpRtcp {
MOCK_METHOD1(SetTargetSendBitrate, void(uint32_t bitrate_bps));
MOCK_METHOD1(SetKeyFrameRequestMethod, int32_t(KeyFrameRequestMethod method));
MOCK_METHOD0(RequestKeyFrame, int32_t());
MOCK_METHOD3(SendLossNotification,
MOCK_METHOD4(SendLossNotification,
int32_t(uint16_t last_decoded_seq_num,
uint16_t last_received_seq_num,
bool decodability_flag));
bool decodability_flag,
bool buffering_allowed));
MOCK_METHOD0(Process, void());
MOCK_METHOD1(RegisterSendChannelRtpStatisticsCallback,
void(StreamDataCountersCallback*));

9
modules/rtp_rtcp/source/rtcp_sender.cc
View file

@ -215,7 +215,8 @@ int32_t RTCPSender::SetSendingStatus(const FeedbackState& feedback_state,
int32_t RTCPSender::SendLossNotification(const FeedbackState& feedback_state,
uint16_t last_decoded_seq_num,
uint16_t last_received_seq_num,
bool decodability_flag) {
bool decodability_flag,
bool buffering_allowed) {
rtc::CritScope lock(&critical_section_rtcp_sender_);
loss_notification_state_.last_decoded_seq_num = last_decoded_seq_num;
@ -224,7 +225,11 @@ int32_t RTCPSender::SendLossNotification(const FeedbackState& feedback_state,
SetFlag(kRtcpLossNotification, /*is_volatile=*/true);
// Send immediately.
if (buffering_allowed) {
// The loss notification will be batched with additional feedback messages.
return 0;
}
return SendCompoundRTCP(feedback_state,
{RTCPPacketType::kRtcpLossNotification});
}

3
modules/rtp_rtcp/source/rtcp_sender.h
View file

@ -117,7 +117,8 @@ class RTCPSender {
int32_t SendLossNotification(const FeedbackState& feedback_state,
uint16_t last_decoded_seq_num,
uint16_t last_received_seq_num,
bool decodability_flag);
bool decodability_flag,
bool buffering_allowed);
void SetRemb(int64_t bitrate_bps, std::vector<uint32_t> ssrcs);

50
modules/rtp_rtcp/source/rtcp_sender_unittest.cc
View file

@ -10,6 +10,7 @@
#include <memory>
#include "absl/base/macros.h"
#include "modules/rtp_rtcp/include/rtp_rtcp_defines.h"
#include "modules/rtp_rtcp/source/rtcp_packet/bye.h"
#include "modules/rtp_rtcp/source/rtcp_packet/common_header.h"
@ -366,28 +367,61 @@ TEST_F(RtcpSenderTest, SendPli) {
TEST_F(RtcpSenderTest, SendNack) {
rtcp_sender_->SetRTCPStatus(RtcpMode::kReducedSize);
const uint16_t kList[] = {0, 1, 16};
const int32_t kListLength = sizeof(kList) / sizeof(kList[0]);
EXPECT_EQ(0, rtcp_sender_->SendRTCP(feedback_state(), kRtcpNack, kListLength,
kList));
EXPECT_EQ(0, rtcp_sender_->SendRTCP(feedback_state(), kRtcpNack,
ABSL_ARRAYSIZE(kList), kList));
EXPECT_EQ(1, parser()->nack()->num_packets());
EXPECT_EQ(kSenderSsrc, parser()->nack()->sender_ssrc());
EXPECT_EQ(kRemoteSsrc, parser()->nack()->media_ssrc());
EXPECT_THAT(parser()->nack()->packet_ids(), ElementsAre(0, 1, 16));
}
TEST_F(RtcpSenderTest, SendLossNotification) {
TEST_F(RtcpSenderTest, SendLossNotificationBufferingNotAllowed) {
rtcp_sender_->SetRTCPStatus(RtcpMode::kReducedSize);
constexpr uint16_t kLastDecoded = 0x1234;
constexpr uint16_t kLastReceived = 0x4321;
constexpr bool kDecodabilityFlag = true;
const int32_t result = rtcp_sender_->SendLossNotification(
feedback_state(), kLastDecoded, kLastReceived, kDecodabilityFlag);
EXPECT_EQ(result, 0);
EXPECT_EQ(1, parser()->loss_notification()->num_packets());
constexpr bool kBufferingAllowed = false;
EXPECT_EQ(rtcp_sender_->SendLossNotification(feedback_state(), kLastDecoded,
kLastReceived, kDecodabilityFlag,
kBufferingAllowed),
0);
EXPECT_EQ(parser()->processed_rtcp_packets(), 1u);
EXPECT_EQ(parser()->loss_notification()->num_packets(), 1);
EXPECT_EQ(kSenderSsrc, parser()->loss_notification()->sender_ssrc());
EXPECT_EQ(kRemoteSsrc, parser()->loss_notification()->media_ssrc());
}
TEST_F(RtcpSenderTest, SendLossNotificationBufferingAllowed) {
rtcp_sender_->SetRTCPStatus(RtcpMode::kReducedSize);
constexpr uint16_t kLastDecoded = 0x1234;
constexpr uint16_t kLastReceived = 0x4321;
constexpr bool kDecodabilityFlag = true;
constexpr bool kBufferingAllowed = true;
EXPECT_EQ(rtcp_sender_->SendLossNotification(feedback_state(), kLastDecoded,
kLastReceived, kDecodabilityFlag,
kBufferingAllowed),
0);
// No RTCP messages sent yet.
ASSERT_EQ(parser()->processed_rtcp_packets(), 0u);
// Sending another messages triggers sending the LNTF messages as well.
const uint16_t kList[] = {0, 1, 16};
EXPECT_EQ(rtcp_sender_->SendRTCP(feedback_state(), kRtcpNack,
ABSL_ARRAYSIZE(kList), kList),
0);
// Exactly one packet was produced, and it contained both the buffered LNTF
// as well as the message that had triggered the packet.
EXPECT_EQ(parser()->processed_rtcp_packets(), 1u);
EXPECT_EQ(parser()->loss_notification()->num_packets(), 1);
EXPECT_EQ(parser()->loss_notification()->sender_ssrc(), kSenderSsrc);
EXPECT_EQ(parser()->loss_notification()->media_ssrc(), kRemoteSsrc);
EXPECT_EQ(parser()->nack()->num_packets(), 1);
EXPECT_EQ(parser()->nack()->sender_ssrc(), kSenderSsrc);
EXPECT_EQ(parser()->nack()->media_ssrc(), kRemoteSsrc);
}
TEST_F(RtcpSenderTest, RembNotIncludedBeforeSet) {
rtcp_sender_->SetRTCPStatus(RtcpMode::kReducedSize);

5
modules/rtp_rtcp/source/rtp_rtcp_impl.cc
View file

@ -754,10 +754,11 @@ int32_t ModuleRtpRtcpImpl::RequestKeyFrame() {
int32_t ModuleRtpRtcpImpl::SendLossNotification(uint16_t last_decoded_seq_num,
uint16_t last_received_seq_num,
bool decodability_flag) {
bool decodability_flag,
bool buffering_allowed) {
return rtcp_sender_.SendLossNotification(
GetFeedbackState(), last_decoded_seq_num, last_received_seq_num,
decodability_flag);
decodability_flag, buffering_allowed);
}
void ModuleRtpRtcpImpl::SetRemoteSSRC(const uint32_t ssrc) {

3
modules/rtp_rtcp/source/rtp_rtcp_impl.h
View file

@ -263,7 +263,8 @@ class ModuleRtpRtcpImpl : public RtpRtcp, public RTCPReceiver::ModuleRtpRtcp {
int32_t SendLossNotification(uint16_t last_decoded_seq_num,
uint16_t last_received_seq_num,
bool decodability_flag) override;
bool decodability_flag,
bool buffering_allowed) override;
bool LastReceivedNTP(uint32_t* NTPsecs,
uint32_t* NTPfrac,

2
modules/video_coding/loss_notification_controller.cc
View file

@ -181,7 +181,7 @@ void LossNotificationController::HandleLoss(uint16_t last_received_seq_num,
last_decodable_non_discardable_->first_seq_num));
loss_notification_sender_->SendLossNotification(
last_decodable_non_discardable_->first_seq_num, last_received_seq_num,
decodability_flag);
decodability_flag, /*buffering_allowed=*/true);
} else {
key_frame_request_sender_->RequestKeyFrame();
}

4
modules/video_coding/loss_notification_controller_unittest.cc
View file

@ -95,7 +95,9 @@ class LossNotificationControllerBaseTest : public ::testing::Test,
// LossNotificationSender implementation.
void SendLossNotification(uint16_t last_decoded_seq_num,
uint16_t last_received_seq_num,
bool decodability_flag) override {
bool decodability_flag,
bool buffering_allowed) override {
EXPECT_TRUE(buffering_allowed); // (Flag useful elsewhere.)
EXPECT_FALSE(LastKeyFrameRequest());
EXPECT_FALSE(LastLossNotification());
last_loss_notification_.emplace(last_decoded_seq_num, last_received_seq_num,

3
test/rtcp_packet_parser.cc
View file

@ -22,8 +22,11 @@ RtcpPacketParser::RtcpPacketParser() = default;
RtcpPacketParser::~RtcpPacketParser() = default;
bool RtcpPacketParser::Parse(const void* data, size_t length) {
++processed_rtcp_packets_;
const uint8_t* const buffer = static_cast<const uint8_t*>(data);
const uint8_t* const buffer_end = buffer + length;
rtcp::CommonHeader header;
for (const uint8_t* next_packet = buffer; next_packet != buffer_end;
next_packet = header.NextPacket()) {

2
test/rtcp_packet_parser.h
View file

@ -105,6 +105,7 @@ class RtcpPacketParser {
return &transport_feedback_;
}
uint32_t sender_ssrc() const { return sender_ssrc_; }
size_t processed_rtcp_packets() const { return processed_rtcp_packets_; }
private:
PacketCounter<rtcp::App> app_;
@ -124,6 +125,7 @@ class RtcpPacketParser {
PacketCounter<rtcp::Tmmbr> tmmbr_;
PacketCounter<rtcp::TransportFeedback> transport_feedback_;
uint32_t sender_ssrc_ = 0;
size_t processed_rtcp_packets_ = 0;
};
} // namespace test

30
video/rtp_video_stream_receiver.cc
View file

@ -116,7 +116,9 @@ void RtpVideoStreamReceiver::RtcpFeedbackBuffer::SendNack(
void RtpVideoStreamReceiver::RtcpFeedbackBuffer::SendLossNotification(
uint16_t last_decoded_seq_num,
uint16_t last_received_seq_num,
bool decodability_flag) {
bool decodability_flag,
bool buffering_allowed) {
RTC_DCHECK(buffering_allowed);
rtc::CritScope lock(&cs_);
RTC_DCHECK(lntf_state_)
<< "SendLossNotification() called twice in a row with no call to "
@ -125,8 +127,6 @@ void RtpVideoStreamReceiver::RtcpFeedbackBuffer::SendLossNotification(
last_decoded_seq_num, last_received_seq_num, decodability_flag);
}
// TODO(bugs.webrtc.org/10336): Make SendBufferedRtcpFeedback() actually
// set everything, then send it all together.
void RtpVideoStreamReceiver::RtcpFeedbackBuffer::SendBufferedRtcpFeedback() {
bool request_key_frame = false;
std::vector<uint16_t> nack_sequence_numbers;
@ -139,17 +139,24 @@ void RtpVideoStreamReceiver::RtcpFeedbackBuffer::SendBufferedRtcpFeedback() {
std::swap(lntf_state, lntf_state_);
}
if (lntf_state) {
// If either a NACK or a key frame request is sent, we should buffer
// the LNTF and wait for them (NACK or key frame request) to trigger
// the compound feedback message.
// Otherwise, the LNTF should be sent out immediately.
const bool buffering_allowed =
request_key_frame || !nack_sequence_numbers.empty();
loss_notification_sender_->SendLossNotification(
lntf_state->last_decoded_seq_num, lntf_state->last_received_seq_num,
lntf_state->decodability_flag, buffering_allowed);
}
if (request_key_frame) {
key_frame_request_sender_->RequestKeyFrame();
} else if (!nack_sequence_numbers.empty()) {
nack_sender_->SendNack(nack_sequence_numbers, true);
}
if (lntf_state) {
loss_notification_sender_->SendLossNotification(
lntf_state->last_decoded_seq_num, lntf_state->last_received_seq_num,
lntf_state->decodability_flag);
}
}
RtpVideoStreamReceiver::RtpVideoStreamReceiver(
@ -478,10 +485,11 @@ void RtpVideoStreamReceiver::RequestKeyFrame() {
void RtpVideoStreamReceiver::SendLossNotification(
uint16_t last_decoded_seq_num,
uint16_t last_received_seq_num,
bool decodability_flag) {
bool decodability_flag,
bool buffering_allowed) {
RTC_DCHECK(config_.rtp.lntf.enabled);
rtp_rtcp_->SendLossNotification(last_decoded_seq_num, last_received_seq_num,
decodability_flag);
decodability_flag, buffering_allowed);
}
bool RtpVideoStreamReceiver::IsUlpfecEnabled() const {

6
video/rtp_video_stream_receiver.h
View file

@ -127,7 +127,8 @@ class RtpVideoStreamReceiver : public LossNotificationSender,
// Implements LossNotificationSender.
void SendLossNotification(uint16_t last_decoded_seq_num,
uint16_t last_received_seq_num,
bool decodability_flag) override;
bool decodability_flag,
bool buffering_allowed) override;
bool IsUlpfecEnabled() const;
bool IsRetransmissionsEnabled() const;
@ -204,7 +205,8 @@ class RtpVideoStreamReceiver : public LossNotificationSender,
// LossNotificationSender implementation.
void SendLossNotification(uint16_t last_decoded_seq_num,
uint16_t last_received_seq_num,
bool decodability_flag) override;
bool decodability_flag,
bool buffering_allowed) override;
// Send all RTCP feedback messages buffered thus far.
void SendBufferedRtcpFeedback();