Tried to reproduce the issue with AudioTrackSinkInterface::OnData

webrtc/examples/peerconnection/client/conductor.cc

Index: webrtc/examples/peerconnection/client/conductor.cc
diff --git a/webrtc/examples/peerconnection/client/conductor.cc b/webrtc/examples/peerconnection/client/conductor.cc
index 1b656512a0576bcb0d61f31710fa53ef81878c28..5afc633b777cd3f86a7bc8675cdde03494a80fe3 100644
--- a/webrtc/examples/peerconnection/client/conductor.cc
+++ b/webrtc/examples/peerconnection/client/conductor.cc
@@ -10,6 +10,7 @@
 
 #include "webrtc/examples/peerconnection/client/conductor.h"
 
+#include <iostream>
 #include <memory>
 #include <utility>
 #include <vector>
@@ -34,6 +35,22 @@ const char kSessionDescriptionSdpName[] = "sdp";
 #define DTLS_ON  true
 #define DTLS_OFF false
 
+class MyAudioSink : public webrtc::AudioTrackSinkInterface {
+ public:
+  MyAudioSink() { std::cout << "[Sink] Constructing new sink!" << std::endl; }
+  void OnData(const void* audio_data,
+              int bits_per_sample,
+              int sample_rate,
+              size_t number_of_channels,
+              size_t number_of_frames) {
+    std::cout << "[Sink] bits per sample: " << bits_per_sample << "\n"
+              << "[Sink] sample rate: " << sample_rate << "\n"
+              << "[Sink] #channels: " << number_of_channels << "\n"
+              << "[Sink] #frames: " << number_of_frames
+              << std::endl;
+  }
+};
+
 class DummySetSessionDescriptionObserver
     : public webrtc::SetSessionDescriptionObserver {
  public:
@@ -493,6 +510,12 @@ void Conductor::UIThreadCallback(int msg_id, void* data) {
         webrtc::VideoTrackInterface* track = tracks[0];
         main_wnd_->StartRemoteRenderer(track);
       }
+
+      webrtc::AudioTrackVector audio_tracks = stream->GetAudioTracks();
+      for (auto & audio_track : audio_tracks) {
+        audio_track->AddSink(new MyAudioSink());
+      }
+
       stream->Release();
       break;
     }