Delete VCMJitterBuffer::UpdateRtt and related unused code

Bug: webrtc:7408
Change-Id: Ic4bd745ed36dd7f7d5eec6531e05204035a545fd
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/133188
Reviewed-by: Philip Eliasson <philipel@webrtc.org>
Commit-Queue: Niels Moller <nisse@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#27648}

modules/video_coding/jitter_buffer.cc

@@ -128,7 +128,6 @@ VCMJitterBuffer::VCMJitterBuffer(Clock* clock,
       num_duplicated_packets_(0),
       jitter_estimate_(clock),
       inter_frame_delay_(clock_->TimeInMilliseconds()),
-      rtt_ms_(kDefaultRtt),
       missing_sequence_numbers_(SequenceNumberLessThan()),
       latest_received_sequence_number_(0),
       max_nack_list_size_(0),
@@ -169,7 +168,6 @@ void VCMJitterBuffer::Start() {
   waiting_for_completion_.timestamp = 0;
   waiting_for_completion_.latest_packet_time = -1;
   first_packet_since_reset_ = true;
-  rtt_ms_ = kDefaultRtt;
   last_decoded_state_.Reset();
 
   decodable_frames_.Reset(&free_frames_);
@@ -434,7 +432,7 @@ VCMFrameBufferEnum VCMJitterBuffer::InsertPacket(const VCMPacket& packet,
   VCMFrameBufferStateEnum previous_state = frame->GetState();
   // Insert packet.
   FrameData frame_data;
-  frame_data.rtt_ms = rtt_ms_;
+  frame_data.rtt_ms = kDefaultRtt;
   frame_data.rolling_average_packets_per_frame = average_packets_per_frame_;
   VCMFrameBufferEnum buffer_state =
       frame->InsertPacket(packet, now_ms, frame_data);
@@ -587,12 +585,6 @@ uint32_t VCMJitterBuffer::EstimatedJitterMs() {
   return jitter_estimate_.GetJitterEstimate(rtt_mult);
 }
 
-void VCMJitterBuffer::UpdateRtt(int64_t rtt_ms) {
-  rtc::CritScope cs(&crit_sect_);
-  rtt_ms_ = rtt_ms;
-  jitter_estimate_.UpdateRtt(rtt_ms);
-}
-
 void VCMJitterBuffer::SetNackSettings(size_t max_nack_list_size,
                                       int max_packet_age_to_nack,
                                       int max_incomplete_time_ms) {

modules/video_coding/jitter_buffer.h

@@ -118,9 +118,6 @@ class VCMJitterBuffer {
   // Returns the estimated jitter in milliseconds.
   uint32_t EstimatedJitterMs();
 
-  // Updates the round-trip time estimate.
-  void UpdateRtt(int64_t rtt_ms);
-
   void SetNackSettings(size_t max_nack_list_size,
                        int max_packet_age_to_nack,
                        int max_incomplete_time_ms);
@@ -255,7 +252,6 @@ class VCMJitterBuffer {
   // Calculates network delays used for jitter calculations.
   VCMInterFrameDelay inter_frame_delay_;
   VCMJitterSample waiting_for_completion_;
-  int64_t rtt_ms_;
 
   // Holds the internal NACK list (the missing sequence numbers).
   SequenceNumberSet missing_sequence_numbers_;

modules/video_coding/receiver.cc

@@ -61,10 +61,6 @@ void VCMReceiver::Reset() {
   }
 }
 
-void VCMReceiver::UpdateRtt(int64_t rtt) {
-  jitter_buffer_.UpdateRtt(rtt);
-}
-
 int32_t VCMReceiver::InsertPacket(const VCMPacket& packet) {
   // Insert the packet into the jitter buffer. The packet can either be empty or
   // contain media at this point.

modules/video_coding/receiver.h

@@ -43,7 +43,6 @@ class VCMReceiver {
   ~VCMReceiver();
 
   void Reset();
-  void UpdateRtt(int64_t rtt);
   int32_t InsertPacket(const VCMPacket& packet);
   VCMEncodedFrame* FrameForDecoding(uint16_t max_wait_time_ms,
                                     bool prefer_late_decoding);

modules/video_coding/video_coding_impl.h

@@ -84,7 +84,6 @@ class VideoReceiver : public Module {
                        int max_packet_age_to_nack,
                        int max_incomplete_time_ms);
 
-  int32_t SetReceiveChannelParameters(int64_t rtt);
   int64_t TimeUntilNextProcess() override;
   void Process() override;
   void ProcessThreadAttached(ProcessThread* process_thread) override;

modules/video_coding/video_receiver.cc

@@ -135,12 +135,6 @@ int64_t VideoReceiver::TimeUntilNextProcess() {
   return timeUntilNextProcess;
 }
 
-int32_t VideoReceiver::SetReceiveChannelParameters(int64_t rtt) {
-  RTC_DCHECK_RUN_ON(&module_thread_checker_);
-  _receiver.UpdateRtt(rtt);
-  return 0;
-}
-
 // Register a receive callback. Will be called whenever there is a new frame
 // ready for rendering.
 int32_t VideoReceiver::RegisterReceiveCallback(