Revert "Ignore allocated bitrate during initial exponential BWE."

This reverts commit 33cc83595a.

Reason for revert: Perf bots showed that this cl cause a change in metrics. It looks like it is for the better, but we want this to be behind a field trial. 

Original change's description:
> Ignore allocated bitrate during initial exponential BWE.
>
> The reason why we want to do this is  because audio can allocate a needed bitrate before video when starting a call, which may lead to a race between the first probe result and updating the allocated bitrate.
> That is the, initial probe will try to probe up to the max configured bitrate.
>
> ProbeController::SetFirstProbeToMaxBitrate will allow the first probe to
> continue up to the max configured bitrate, regardless of of the max
> allocated bitrate.
>
> Bug: webrtc:14928
> Change-Id: I6e0ae90e21a78466527f3464951e6033dc846470
> Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/346760
> Reviewed-by: Diep Bui <diepbp@webrtc.org>
> Commit-Queue: Per Kjellander <perkj@webrtc.org>
> Reviewed-by: Erik Språng <sprang@webrtc.org>
> Reviewed-by: Per Kjellander <perkj@webrtc.org>
> Cr-Commit-Position: refs/heads/main@{#42049}

Bug: webrtc:14928
Change-Id: I56ba58560b6857b6069552c02df822691f7af64d
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/347622
Bot-Commit: rubber-stamper@appspot.gserviceaccount.com <rubber-stamper@appspot.gserviceaccount.com>
Commit-Queue: Per Kjellander <perkj@webrtc.org>
Reviewed-by: Diep Bui <diepbp@webrtc.org>
Owners-Override: Per Kjellander <perkj@webrtc.org>
Cr-Commit-Position: refs/heads/main@{#42081}

api/transport/network_types.h

@@ -46,10 +46,6 @@ struct StreamsConfig {
   ~StreamsConfig();
   Timestamp at_time = Timestamp::PlusInfinity();
   absl::optional<bool> requests_alr_probing;
-  // If `initial_probe_to_max_bitrate` is set to true, the first probe
-  // may probe up to the max configured bitrate and can ignore
-  // max_total_allocated_bitrate.
-  absl::optional<bool> initial_probe_to_max_bitrate;
   absl::optional<double> pacing_factor;
 
   // TODO(srte): Use BitrateAllocationLimits here.

call/rtp_transport_controller_send.cc

@@ -263,11 +263,6 @@ void RtpTransportControllerSend::ReconfigureBandwidthEstimation(
   RTC_DCHECK_RUN_ON(&sequence_checker_);
   bwe_settings_ = settings;
 
-  bool allow_probe_without_media = bwe_settings_.allow_probe_without_media &&
-                                   packet_router_.SupportsRtxPayloadPadding();
-  streams_config_.initial_probe_to_max_bitrate = allow_probe_without_media;
-  pacer_.SetAllowProbeWithoutMediaPacket(allow_probe_without_media);
-
   if (controller_) {
     // Recreate the controller and handler.
     control_handler_ = nullptr;
@@ -281,6 +276,9 @@ void RtpTransportControllerSend::ReconfigureBandwidthEstimation(
       UpdateNetworkAvailability();
     }
   }
+  pacer_.SetAllowProbeWithoutMediaPacket(
+      bwe_settings_.allow_probe_without_media &&
+      packet_router_.SupportsRtxPayloadPadding());
 }
 
 void RtpTransportControllerSend::RegisterTargetTransferRateObserver(

modules/congestion_controller/goog_cc/goog_cc_network_control.cc

@@ -218,10 +218,6 @@ NetworkControlUpdate GoogCcNetworkController::OnProcessInterval(
       probe_controller_->EnablePeriodicAlrProbing(
           *initial_config_->stream_based_config.requests_alr_probing);
     }
-    if (initial_config_->stream_based_config.initial_probe_to_max_bitrate) {
-      probe_controller_->SetFirstProbeToMaxBitrate(
-          *initial_config_->stream_based_config.initial_probe_to_max_bitrate);
-    }
     absl::optional<DataRate> total_bitrate =
         initial_config_->stream_based_config.max_total_allocated_bitrate;
     if (total_bitrate) {

modules/congestion_controller/goog_cc/probe_controller.cc

@@ -272,22 +272,6 @@ std::vector<ProbeClusterConfig> ProbeController::OnNetworkAvailability(
   return std::vector<ProbeClusterConfig>();
 }
 
-void ProbeController::UpdateState(State new_state) {
-  switch (new_state) {
-    case State::kInit:
-      state_ = State::kInit;
-      break;
-    case State::kWaitingForProbingResult:
-      state_ = State::kWaitingForProbingResult;
-      break;
-    case State::kProbingComplete:
-      state_ = State::kProbingComplete;
-      waiting_for_initial_probe_result_ = false;
-      min_bitrate_to_probe_further_ = DataRate::PlusInfinity();
-      break;
-  }
-}
-
 std::vector<ProbeClusterConfig> ProbeController::InitiateExponentialProbing(
     Timestamp at_time) {
   RTC_DCHECK(network_available_);
@@ -303,8 +287,6 @@ std::vector<ProbeClusterConfig> ProbeController::InitiateExponentialProbing(
     probes.push_back(config_.second_exponential_probe_scale.Value() *
                      start_bitrate_);
   }
-  waiting_for_initial_probe_result_ = true;
-
   return InitiateProbing(at_time, probes, true);
 }
 
@@ -325,7 +307,6 @@ std::vector<ProbeClusterConfig> ProbeController::SetEstimatedBitrate(
     if (config_.abort_further_probe_if_max_lower_than_current &&
         (bitrate > max_bitrate_ ||
          (!max_total_allocated_bitrate_.IsZero() &&
-          !(waiting_for_initial_probe_result_ && first_probe_to_max_bitrate_) &&
           bitrate > 2 * max_total_allocated_bitrate_))) {
       // No need to continue probing.
       min_bitrate_to_probe_further_ = DataRate::PlusInfinity();
@@ -354,11 +335,6 @@ void ProbeController::EnablePeriodicAlrProbing(bool enable) {
   enable_periodic_alr_probing_ = enable;
 }
 
-void ProbeController::SetFirstProbeToMaxBitrate(
-    bool first_probe_to_max_bitrate) {
-  first_probe_to_max_bitrate_ = first_probe_to_max_bitrate;
-}
-
 void ProbeController::SetAlrStartTimeMs(
     absl::optional<int64_t> alr_start_time_ms) {
   if (alr_start_time_ms) {
@@ -415,7 +391,6 @@ void ProbeController::SetNetworkStateEstimate(
 void ProbeController::Reset(Timestamp at_time) {
   bandwidth_limited_cause_ = BandwidthLimitedCause::kDelayBasedLimited;
   state_ = State::kInit;
-  waiting_for_initial_probe_result_ = false;
   min_bitrate_to_probe_further_ = DataRate::PlusInfinity();
   time_last_probing_initiated_ = Timestamp::Zero();
   estimated_bitrate_ = DataRate::Zero();
@@ -477,7 +452,8 @@ std::vector<ProbeClusterConfig> ProbeController::Process(Timestamp at_time) {
       kMaxWaitingTimeForProbingResult) {
     if (state_ == State::kWaitingForProbingResult) {
       RTC_LOG(LS_INFO) << "kWaitingForProbingResult: timeout";
-      UpdateState(State::kProbingComplete);
+      state_ = State::kProbingComplete;
+      min_bitrate_to_probe_further_ = DataRate::PlusInfinity();
     }
   }
   if (estimated_bitrate_.IsZero() || state_ != State::kProbingComplete) {
@@ -504,14 +480,14 @@ std::vector<ProbeClusterConfig> ProbeController::InitiateProbing(
             : std::min(max_total_allocated_bitrate_, max_bitrate_);
     if (std::min(network_estimate, estimated_bitrate_) >
         config_.skip_if_estimate_larger_than_fraction_of_max * max_probe_rate) {
-      UpdateState(State::kProbingComplete);
+      state_ = State::kProbingComplete;
+      min_bitrate_to_probe_further_ = DataRate::PlusInfinity();
       return {};
     }
   }
 
   DataRate max_probe_bitrate = max_bitrate_;
-  if (max_total_allocated_bitrate_ > DataRate::Zero() &&
+  if (max_total_allocated_bitrate_ > DataRate::Zero()) {
-      !waiting_for_initial_probe_result_) {
     // If a max allocated bitrate has been configured, allow probing up to 2x
     // that rate. This allows some overhead to account for bursty streams,
     // which otherwise would have to ramp up when the overshoot is already in
@@ -579,14 +555,15 @@ std::vector<ProbeClusterConfig> ProbeController::InitiateProbing(
   }
   time_last_probing_initiated_ = now;
   if (probe_further) {
-    UpdateState(State::kWaitingForProbingResult);
+    state_ = State::kWaitingForProbingResult;
     // Dont expect probe results to be larger than a fraction of the actual
     // probe rate.
     min_bitrate_to_probe_further_ =
         std::min(estimate_capped_bitrate, (*(bitrates_to_probe.end() - 1))) *
         config_.further_probe_threshold;
   } else {
-    UpdateState(State::kProbingComplete);
+    state_ = State::kProbingComplete;
+    min_bitrate_to_probe_further_ = DataRate::PlusInfinity();
   }
   return pending_probes;
 }

modules/congestion_controller/goog_cc/probe_controller.h

@@ -121,9 +121,6 @@ class ProbeController {
       Timestamp at_time);
 
   void EnablePeriodicAlrProbing(bool enable);
-  // The first initial probe ignores allocated bitrate constraints and probe up
-  // to max configured bitrate configured via SetBitrates.
-  void SetFirstProbeToMaxBitrate(bool first_probe_to_max_bitrate);
 
   void SetAlrStartTimeMs(absl::optional<int64_t> alr_start_time);
   void SetAlrEndedTimeMs(int64_t alr_end_time);
@@ -151,7 +148,6 @@ class ProbeController {
     kProbingComplete,
   };
 
-  void UpdateState(State new_state);
   ABSL_MUST_USE_RESULT std::vector<ProbeClusterConfig>
   InitiateExponentialProbing(Timestamp at_time);
   ABSL_MUST_USE_RESULT std::vector<ProbeClusterConfig> InitiateProbing(
@@ -162,8 +158,6 @@ class ProbeController {
   bool TimeForNetworkStateProbe(Timestamp at_time) const;
 
   bool network_available_;
-  bool waiting_for_initial_probe_result_ = false;
-  bool first_probe_to_max_bitrate_ = false;
   BandwidthLimitedCause bandwidth_limited_cause_ =
       BandwidthLimitedCause::kDelayBasedLimited;
   State state_;

modules/congestion_controller/goog_cc/probe_controller_unittest.cc

@@ -327,32 +327,6 @@ TEST(ProbeControllerTest, TestExponentialProbing) {
   EXPECT_EQ(probes[0].target_data_rate.bps(), 2 * 1800);
 }
 
-TEST(ProbeControllerTest, ExponentialProbingStopIfMaxBitrateLow) {
-  ProbeControllerFixture fixture(
-      "WebRTC-Bwe-ProbingConfiguration/abort_further:true/");
-  std::unique_ptr<ProbeController> probe_controller =
-      fixture.CreateController();
-  ASSERT_THAT(
-      probe_controller->OnNetworkAvailability({.network_available = true}),
-      IsEmpty());
-  auto probes = probe_controller->SetBitrates(
-      kMinBitrate, kStartBitrate, kMaxBitrate, fixture.CurrentTime());
-  ASSERT_THAT(probes, SizeIs(Gt(0)));
-
-  // Repeated probe normally is sent when estimated bitrate climbs above
-  // 0.7 * 6 * kStartBitrate = 1260. But since max bitrate is low, expect
-  // exponential probing to stop.
-  probes = probe_controller->SetBitrates(kMinBitrate, kStartBitrate,
-                                         /*max_bitrate=*/kStartBitrate,
-                                         fixture.CurrentTime());
-  EXPECT_THAT(probes, IsEmpty());
-
-  probes = probe_controller->SetEstimatedBitrate(
-      DataRate::BitsPerSec(1800), BandwidthLimitedCause::kDelayBasedLimited,
-      fixture.CurrentTime());
-  EXPECT_THAT(probes, IsEmpty());
-}
-
 TEST(ProbeControllerTest, ExponentialProbingStopIfMaxAllocatedBitrateLow) {
   ProbeControllerFixture fixture(
       "WebRTC-Bwe-ProbingConfiguration/abort_further:true/");
@@ -378,39 +352,6 @@ TEST(ProbeControllerTest, ExponentialProbingStopIfMaxAllocatedBitrateLow) {
   EXPECT_THAT(probes, IsEmpty());
 }
 
-TEST(ProbeControllerTest,
-     InitialProbingIgnoreLowMaxAllocatedbitrateIfSetFirstProbeToMaxBitrate) {
-  ProbeControllerFixture fixture(
-      "WebRTC-Bwe-ProbingConfiguration/abort_further:true/");
-  std::unique_ptr<ProbeController> probe_controller =
-      fixture.CreateController();
-  ASSERT_THAT(
-      probe_controller->OnNetworkAvailability({.network_available = true}),
-      IsEmpty());
-  auto probes = probe_controller->SetBitrates(
-      kMinBitrate, kStartBitrate, kMaxBitrate, fixture.CurrentTime());
-  ASSERT_THAT(probes, SizeIs(Gt(0)));
-  probe_controller->SetFirstProbeToMaxBitrate(true);
-
-  // Repeated probe is sent when estimated bitrate climbs above
-  // 0.7 * 6 * kStartBitrate = 1260. During the initial probe, we ignore the
-  // allocation limit and probe up to the max.
-  probes = probe_controller->OnMaxTotalAllocatedBitrate(kStartBitrate,
-                                                        fixture.CurrentTime());
-  EXPECT_THAT(probes, IsEmpty());
-
-  probes = probe_controller->SetEstimatedBitrate(
-      DataRate::BitsPerSec(1800), BandwidthLimitedCause::kDelayBasedLimited,
-      fixture.CurrentTime());
-  EXPECT_EQ(probes.size(), 1u);
-  EXPECT_EQ(probes[0].target_data_rate.bps(), 2 * 1800);
-
-  probes = probe_controller->SetEstimatedBitrate(
-      probes[0].target_data_rate, BandwidthLimitedCause::kDelayBasedLimited,
-      fixture.CurrentTime());
-  EXPECT_EQ(probes.size(), 1u);
-}
-
 TEST(ProbeControllerTest, TestExponentialProbingTimeout) {
   ProbeControllerFixture fixture;
   std::unique_ptr<ProbeController> probe_controller =