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Avoid bouncing first probe packet via pacer queue.

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This avoids potentially creating structures in the queue, and removes
usage of a special priority class enabling us to move priority handling
in a follow-up.

Bug: webrtc:11340
Change-Id: I2286ef6eac62e1d6dd89f6eb6035b23f27543d8a
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/259960
Reviewed-by: Emil Lundmark <lndmrk@webrtc.org>
Commit-Queue: Erik Språng <sprang@webrtc.org>
Cr-Commit-Position: refs/heads/main@{#36641}
This commit is contained in:
Erik Språng
2022-04-24 15:10:59 +02:00
committed by WebRTC LUCI CQ
parent 88b8dec17b
commit e65d05da25
1 changed files with 23 additions and 20 deletions
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43
modules/pacing/pacing_controller.cc
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@ -471,21 +471,6 @@ void PacingController::ProcessPackets() {
if (pacing_info.probe_cluster_id != PacedPacketInfo::kNotAProbe) {
recommended_probe_size = prober_.RecommendedMinProbeSize();
RTC_DCHECK_GT(recommended_probe_size, DataSize::Zero());
// If first packet in probe, insert a small padding packet so we have a
// more reliable start window for the rate estimation.
if (pacing_info.probe_cluster_bytes_sent == 0) {
auto padding = packet_sender_->GeneratePadding(DataSize::Bytes(1));
// If no RTP modules sending media are registered, we may not get a
// padding packet back.
if (!padding.empty()) {
// Insert with high priority so larger media packets don't preempt it.
EnqueuePacketInternal(std::move(padding[0]), kFirstPriority);
// We should never get more than one padding packets with a requested
// size of 1 byte.
RTC_DCHECK_EQ(padding.size(), 1u);
}
}
} else {
// No valid probe cluster returned, probe might have timed out.
is_probing = false;
@ -546,10 +531,13 @@ void PacingController::ProcessPackets() {
// Send done, update send time.
OnPacketSent(packet_type, packet_size, now);
// If we are currently probing, we need to stop the send loop when we
// have reached the send target.
if (is_probing && data_sent >= recommended_probe_size) {
break;
if (is_probing) {
pacing_info.probe_cluster_bytes_sent += packet_size.bytes();
// If we are currently probing, we need to stop the send loop when we
// have reached the send target.
if (data_sent >= recommended_probe_size) {
break;
}
}
// Update target send time in case that are more packets that we are late
@ -627,6 +615,22 @@ std::unique_ptr<RtpPacketToSend> PacingController::GetPendingPacket(
const PacedPacketInfo& pacing_info,
Timestamp target_send_time,
Timestamp now) {
const bool is_probe =
pacing_info.probe_cluster_id != PacedPacketInfo::kNotAProbe;
// If first packet in probe, insert a small padding packet so we have a
// more reliable start window for the rate estimation.
if (is_probe && pacing_info.probe_cluster_bytes_sent == 0) {
auto padding = packet_sender_->GeneratePadding(DataSize::Bytes(1));
// If no RTP modules sending media are registered, we may not get a
// padding packet back.
if (!padding.empty()) {
// We should never get more than one padding packets with a requested
// size of 1 byte.
RTC_DCHECK_EQ(padding.size(), 1u);
return std::move(padding[0]);
}
}
if (packet_queue_.Empty()) {
return nullptr;
}
@ -636,7 +640,6 @@ std::unique_ptr<RtpPacketToSend> PacingController::GetPendingPacket(
// Unpaced audio packets and probes are exempted from send checks.
bool unpaced_audio_packet =
!pace_audio_ && packet_queue_.LeadingAudioPacketEnqueueTime().has_value();
bool is_probe = pacing_info.probe_cluster_id != PacedPacketInfo::kNotAProbe;
if (!unpaced_audio_packet && !is_probe) {
if (congested_) {
// Don't send anything if congested.