Change frame length on very low bandwidth.

webrtc/modules/audio_coding/audio_network_adaptor/controller_manager_unittest.cc

 /*
  *  Copyright (c) 2016 The WebRTC project authors. All Rights Reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
@@ skipping 252 matching lines @@
   scoring_point->set_uplink_bandwidth_bps(kChracteristicBandwithBps[1]);
   scoring_point->set_uplink_packet_loss_fraction(
       kChracteristicPacketLossFraction[1]);
 }
 
 constexpr int kInitialBitrateBps = 24000;
 constexpr size_t kIntialChannelsToEncode = 1;
 constexpr bool kInitialDtxEnabled = true;
 constexpr bool kInitialFecEnabled = true;
 constexpr int kInitialFrameLengthMs = 60;
+constexpr int kMinBitrateBps = 6000;
 
 ControllerManagerStates CreateControllerManager(
     const std::string& config_string) {
   ControllerManagerStates states;
   states.simulated_clock.reset(new SimulatedClock(kClockInitialTime));
   constexpr size_t kNumEncoderChannels = 2;
   const std::vector<int> encoder_frame_lengths_ms = {20, 60};
   states.controller_manager = ControllerManagerImpl::Create(
       config_string, kNumEncoderChannels, encoder_frame_lengths_ms,
-      kIntialChannelsToEncode, kInitialFrameLengthMs, kInitialBitrateBps,
-      kInitialFecEnabled, kInitialDtxEnabled, states.simulated_clock.get());
+      kMinBitrateBps, kIntialChannelsToEncode, kInitialFrameLengthMs,
+      kInitialBitrateBps, kInitialFecEnabled, kInitialDtxEnabled,
+      states.simulated_clock.get());
   return states;
 }
 
 enum class ControllerType : int8_t {
   FEC,
   CHANNEL,
   DTX,
   FRAME_LENGTH,
   BIT_RATE
 };
@@ skipping 116 matching lines @@
   // Reorder now.
   CheckControllersOrder(controllers,
                         std::vector<ControllerType>{
                             ControllerType::FRAME_LENGTH, ControllerType::FEC,
                             ControllerType::CHANNEL, ControllerType::DTX,
                             ControllerType::BIT_RATE});
 }
 #endif  // WEBRTC_AUDIO_NETWORK_ADAPTOR_DEBUG_DUMP
 
 }  // namespace webrtc