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Wire up new PacedSender code path.

Browse Source 
This CL makes the new code path for paced sending functionally complete.
By default, the field trial WebRTC-Pacer-ReferencePackets is Enabled,
meaning that there is no behavior change unless the field trial is
forced to Disabled. This is done in tests, and can be done on the
command line for manual testing.

Bug: webrtc:10633
Change-Id: I0d66c94ef83b5847dee437a785018f09ba3f828d
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/144050
Commit-Queue: Erik Språng <sprang@webrtc.org>
Reviewed-by: Åsa Persson <asapersson@webrtc.org>
Reviewed-by: Sebastian Jansson <srte@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#28497}
This commit is contained in:
Erik Språng
2019-07-05 16:53:43 +02:00
committed by Commit Bot
parent 668ce0c7fa
commit f6468d2569
13 changed files with 904 additions and 236 deletions
Download Patch File Download Diff File Expand all files Collapse all files

125
modules/rtp_rtcp/source/rtp_sender.cc
View File

@ -195,6 +195,9 @@ RTPSender::RTPSender(const RtpRtcp::Configuration& config)
config.field_trials)),
payload_padding_prefer_useful_packets_(
!IsDisabled("WebRTC-PayloadPadding-UseMostUsefulPacket",
config.field_trials)),
pacer_legacy_packet_referencing_(
!IsDisabled("WebRTC-Pacer-LegacyPacketReferencing",
config.field_trials)) {
// This random initialization is not intended to be cryptographic strong.
timestamp_offset_ = random_.Rand<uint32_t>();
@ -283,6 +286,9 @@ RTPSender::RTPSender(
.find("Enabled") == 0),
payload_padding_prefer_useful_packets_(
field_trials.Lookup("WebRTC-PayloadPadding-UseMostUsefulPacket")
.find("Disabled") != 0),
pacer_legacy_packet_referencing_(
field_trials.Lookup("WebRTC-Pacer-LegacyPacketReferencing")
.find("Disabled") != 0) {
// This random initialization is not intended to be cryptographic strong.
timestamp_offset_ = random_.Rand<uint32_t>();
@ -592,31 +598,67 @@ int32_t RTPSender::ReSendPacket(uint16_t packet_id) {
}
const int32_t packet_size = static_cast<int32_t>(stored_packet->packet_size);
// Skip retransmission rate check if not configured.
if (retransmission_rate_limiter_) {
// Check if we're overusing retransmission bitrate.
// TODO(sprang): Add histograms for nack success or failure reasons.
if (!retransmission_rate_limiter_->TryUseRate(packet_size)) {
return -1;
}
}
const bool rtx = (RtxStatus() & kRtxRetransmitted) > 0;
if (paced_sender_) {
// Mark packet as being in pacer queue again, to prevent duplicates.
if (!packet_history_.SetPendingTransmission(packet_id)) {
// Packet has already been removed from history, return early.
return 0;
if (pacer_legacy_packet_referencing_) {
// Check if we're overusing retransmission bitrate.
// TODO(sprang): Add histograms for nack success or failure reasons.
if (retransmission_rate_limiter_ &&
!retransmission_rate_limiter_->TryUseRate(packet_size)) {
return -1;
}
// Mark packet as being in pacer queue again, to prevent duplicates.
if (!packet_history_.SetPendingTransmission(packet_id)) {
// Packet has already been removed from history, return early.
return 0;
}
paced_sender_->InsertPacket(
RtpPacketSender::kNormalPriority, stored_packet->ssrc,
stored_packet->rtp_sequence_number, stored_packet->capture_time_ms,
stored_packet->packet_size, true);
} else {
std::unique_ptr<RtpPacketToSend> packet =
packet_history_.GetPacketAndMarkAsPending(
packet_id, [&](const RtpPacketToSend& stored_packet) {
// Check if we're overusing retransmission bitrate.
// TODO(sprang): Add histograms for nack success or failure
// reasons.
std::unique_ptr<RtpPacketToSend> retransmit_packet;
if (retransmission_rate_limiter_ &&
!retransmission_rate_limiter_->TryUseRate(packet_size)) {
return retransmit_packet;
}
if (rtx) {
retransmit_packet = BuildRtxPacket(stored_packet);
} else {
retransmit_packet =
absl::make_unique<RtpPacketToSend>(stored_packet);
}
retransmit_packet->set_retransmitted_sequence_number(
stored_packet.SequenceNumber());
return retransmit_packet;
});
if (!packet) {
return -1;
}
packet->set_packet_type(RtpPacketToSend::Type::kRetransmission);
paced_sender_->EnqueuePacket(std::move(packet));
}
paced_sender_->InsertPacket(
RtpPacketSender::kNormalPriority, stored_packet->ssrc,
stored_packet->rtp_sequence_number, stored_packet->capture_time_ms,
stored_packet->packet_size, true);
return packet_size;
}
// TODO(sprang): Replace this whole code-path with a pass-through pacer.
// Check if we're overusing retransmission bitrate.
// TODO(sprang): Add histograms for nack success or failure reasons.
if (retransmission_rate_limiter_ &&
!retransmission_rate_limiter_->TryUseRate(packet_size)) {
return -1;
}
std::unique_ptr<RtpPacketToSend> packet =
packet_history_.GetPacketAndSetSendTime(packet_id);
if (!packet) {
@ -624,7 +666,6 @@ int32_t RTPSender::ReSendPacket(uint16_t packet_id) {
return 0;
}
const bool rtx = (RtxStatus() & kRtxRetransmitted) > 0;
if (!PrepareAndSendPacket(std::move(packet), rtx, true, PacedPacketInfo()))
return -1;
@ -926,15 +967,18 @@ size_t RTPSender::TimeToSendPadding(size_t bytes,
return bytes_sent;
}
void RTPSender::GeneratePadding(size_t target_size_bytes) {
std::vector<std::unique_ptr<RtpPacketToSend>> RTPSender::GeneratePadding(
size_t target_size_bytes) {
// This method does not actually send packets, it just generates
// them and puts them in the pacer queue. Since this should incur
// low overhead, keep the lock for the scope of the method in order
// to make the code more readable.
rtc::CritScope lock(&send_critsect_);
if (!sending_media_)
return;
if (!sending_media_) {
return {};
}
std::vector<std::unique_ptr<RtpPacketToSend>> padding_packets;
size_t bytes_left = target_size_bytes;
if ((rtx_ & kRtxRedundantPayloads) != 0) {
while (bytes_left >= 0) {
@ -953,7 +997,7 @@ void RTPSender::GeneratePadding(size_t target_size_bytes) {
bytes_left -= std::min(bytes_left, packet->payload_size());
packet->set_packet_type(RtpPacketToSend::Type::kPadding);
paced_sender_->EnqueuePacket(std::move(packet));
padding_packets.push_back(std::move(packet));
}
}
@ -1022,10 +1066,15 @@ void RTPSender::GeneratePadding(size_t target_size_bytes) {
padding_packet->SetPayloadType(rtx_payload_type_map_.begin()->second);
}
if (rtp_header_extension_map_.IsRegistered(TransportSequenceNumber::kId)) {
padding_packet->ReserveExtension<TransportSequenceNumber>();
}
padding_packet->SetPadding(padding_bytes_in_packet);
bytes_left -= std::min(bytes_left, padding_bytes_in_packet);
paced_sender_->EnqueuePacket(std::move(padding_packet));
padding_packets.push_back(std::move(padding_packet));
}
return padding_packets;
}
bool RTPSender::SendToNetwork(std::unique_ptr<RtpPacketToSend> packet,
@ -1040,18 +1089,28 @@ bool RTPSender::SendToNetwork(std::unique_ptr<RtpPacketToSend> packet,
size_t packet_size =
send_side_bwe_with_overhead_ ? packet->size() : packet->payload_size();
auto packet_type = packet->packet_type();
RTC_DCHECK(packet_type.has_value());
if (ssrc == FlexfecSsrc()) {
// Store FlexFEC packets in the history here, so they can be found
// when the pacer calls TimeToSendPacket.
flexfec_packet_history_.PutRtpPacket(std::move(packet), storage,
absl::nullopt);
RTC_CHECK(packet_type) << "Packet type must be set before sending.";
if (pacer_legacy_packet_referencing_) {
// If |pacer_reference_packets_| then pacer needs to find the packet in
// the history when it is time to send, so move packet there.
if (ssrc == FlexfecSsrc()) {
// Store FlexFEC packets in a separate history since they are on a
// separate SSRC.
flexfec_packet_history_.PutRtpPacket(std::move(packet), storage,
absl::nullopt);
} else {
packet_history_.PutRtpPacket(std::move(packet), storage, absl::nullopt);
}
paced_sender_->InsertPacket(PacketTypeToPriority(*packet_type), ssrc,
seq_no, capture_time_ms, packet_size, false);
} else {
packet_history_.PutRtpPacket(std::move(packet), storage, absl::nullopt);
packet->set_allow_retransmission(storage ==
StorageType::kAllowRetransmission);
paced_sender_->EnqueuePacket(std::move(packet));
}
paced_sender_->InsertPacket(PacketTypeToPriority(*packet_type), ssrc,
seq_no, capture_time_ms, packet_size, false);
return true;
}