Auto pause video streams based on encoder target bitrate.

webrtc/video/video_send_stream.cc

 /*
  *  Copyright (c) 2013 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 848 matching lines @@
   return rtp_states;
 }
 
 void VideoSendStream::SignalNetworkState(NetworkState state) {
   for (RtpRtcp* rtp_rtcp : rtp_rtcp_modules_) {
     rtp_rtcp->SetRTCPStatus(state == kNetworkUp ? config_.rtp.rtcp_mode
                                                 : RtcpMode::kOff);
   }
 }
 
-void VideoSendStream::OnBitrateUpdated(uint32_t bitrate_bps,
-                                       uint8_t fraction_loss,
-                                       int64_t rtt) {
+uint32_t VideoSendStream::OnBitrateUpdated(uint32_t bitrate_bps,
+                                           uint8_t fraction_loss,
+                                           int64_t rtt) {
   payload_router_.SetTargetSendBitrate(bitrate_bps);
   // Get the encoder target rate. It is the estimated network rate -
   // protection overhead.
-  uint32_t encoder_target_rate = protection_bitrate_calculator_.SetTargetRates(
-      bitrate_bps, stats_proxy_.GetSendFrameRate(), fraction_loss, rtt);
-  vie_encoder_.OnBitrateUpdated(encoder_target_rate, fraction_loss, rtt);
+  uint32_t encoder_target_rate_bps =
+      protection_bitrate_calculator_.SetTargetRates(
+          bitrate_bps, stats_proxy_.GetSendFrameRate(), fraction_loss, rtt);
+  vie_encoder_.OnBitrateUpdated(encoder_target_rate_bps, fraction_loss, rtt);
+
+  return bitrate_bps - encoder_target_rate_bps;
 }
 
 int VideoSendStream::ProtectionRequest(const FecProtectionParams* delta_params,
                                        const FecProtectionParams* key_params,
                                        uint32_t* sent_video_rate_bps,
                                        uint32_t* sent_nack_rate_bps,
                                        uint32_t* sent_fec_rate_bps) {
   *sent_video_rate_bps = 0;
   *sent_nack_rate_bps = 0;
   *sent_fec_rate_bps = 0;
   for (RtpRtcp* rtp_rtcp : rtp_rtcp_modules_) {
     uint32_t not_used = 0;
     uint32_t module_video_rate = 0;
     uint32_t module_fec_rate = 0;
     uint32_t module_nack_rate = 0;
     rtp_rtcp->SetFecParameters(delta_params, key_params);
     rtp_rtcp->BitrateSent(&not_used, &module_video_rate, &module_fec_rate,
                           &module_nack_rate);
     *sent_video_rate_bps += module_video_rate;
     *sent_nack_rate_bps += module_nack_rate;
     *sent_fec_rate_bps += module_fec_rate;
   }
   return 0;
 }
 
 }  // namespace internal
 }  // namespace webrtc