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Remove WebRTC-ExcludeTransportSequenceNumberFromFec.

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Bug: webrtc:11503
Change-Id: I5e0b7038286d9501a617e002b70638f34ac556ac
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/173580
Reviewed-by: Christoffer Rodbro <crodbro@webrtc.org>
Reviewed-by: Danil Chapovalov <danilchap@webrtc.org>
Reviewed-by: Harald Alvestrand <hta@webrtc.org>
Commit-Queue: Mirko Bonadei <mbonadei@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#31072}
This commit is contained in:
Mirko Bonadei
2020-04-14 14:20:59 +02:00
committed by Commit Bot
parent 2136b569eb
commit 3ebb6e93f4
3 changed files with 0 additions and 45 deletions
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38
modules/rtp_rtcp/source/rtp_sender_video.cc
View File

@ -45,22 +45,6 @@ namespace {
constexpr size_t kRedForFecHeaderLength = 1;
constexpr int64_t kMaxUnretransmittableFrameIntervalMs = 33 * 4;
// This is experimental field trial to exclude transport sequence number from
// FEC packets and should only be used in conjunction with datagram transport.
// Datagram transport removes transport sequence numbers from RTP packets and
// uses datagram feedback loop to re-generate RTCP feedback packets, but FEC
// contorol packets are calculated before sequence number is removed and as a
// result recovered packets will be corrupt unless we also remove transport
// sequence number during FEC calculation.
//
// TODO(sukhanov): We need to find a better way to implement FEC with datagram
// transport, probably moving FEC to datagram integration layter. We should
// also remove special field trial once we switch datagram path from
// RTCConfiguration flags to field trial and use the same field trial for FEC
// workaround.
const char kExcludeTransportSequenceNumberFromFecFieldTrial[] =
"WebRTC-ExcludeTransportSequenceNumberFromFec";
void BuildRedPayload(const RtpPacketToSend& media_packet,
RtpPacketToSend* red_packet) {
uint8_t* red_payload = red_packet->AllocatePayload(
@ -151,10 +135,6 @@ RTPSenderVideo::RTPSenderVideo(const Config& config)
generic_descriptor_auth_experiment_(!absl::StartsWith(
config.field_trials->Lookup("WebRTC-GenericDescriptorAuth"),
"Disabled")),
exclude_transport_sequence_number_from_fec_experiment_(absl::StartsWith(
config.field_trials->Lookup(
kExcludeTransportSequenceNumberFromFecFieldTrial),
"Enabled")),
absolute_capture_time_sender_(config.clock),
frame_transformer_delegate_(
config.frame_transformer
@ -613,24 +593,6 @@ bool RTPSenderVideo::SendVideo(
}
if (protect_packet && fec_generator_) {
if (red_enabled() &&
exclude_transport_sequence_number_from_fec_experiment_) {
// See comments at the top of the file why experiment
// "WebRTC-kExcludeTransportSequenceNumberFromFec" is needed in
// conjunction with datagram transport.
// TODO(sukhanov): We may also need to implement it for flexfec_sender
// if we decide to keep this approach in the future.
uint16_t transport_senquence_number;
if (packet->GetExtension<webrtc::TransportSequenceNumber>(
&transport_senquence_number)) {
if (!packet->RemoveExtension(webrtc::TransportSequenceNumber::kId)) {
RTC_NOTREACHED()
<< "Failed to remove transport sequence number, packet="
<< packet->ToString();
}
}
}
fec_generator_->AddPacketAndGenerateFec(*packet);
}

2
modules/rtp_rtcp/source/rtp_sender_video.h
View File

@ -211,8 +211,6 @@ class RTPSenderVideo {
// Set to true if the generic descriptor should be authenticated.
const bool generic_descriptor_auth_experiment_;
const bool exclude_transport_sequence_number_from_fec_experiment_;
AbsoluteCaptureTimeSender absolute_capture_time_sender_;
const rtc::scoped_refptr<RTPSenderVideoFrameTransformerDelegate>

5
pc/datagram_rtp_transport.cc
View File

@ -77,11 +77,6 @@ DatagramRtpTransport::DatagramRtpTransport(
"datagram transport connection";
}
// TODO(sukhanov): Add CHECK to make sure that field trial
// WebRTC-ExcludeTransportSequenceNumberFromFecFieldTrial is enabled.
// If feedback loop is translation is enabled, FEC packets must exclude
// transport sequence numbers, otherwise recovered packets will be corrupt.
RTC_DCHECK(ice_transport_);
RTC_DCHECK(datagram_transport_);