Revert of Refactor NACK bitrate allocation

webrtc/video/payload_router.cc

 /*
  *  Copyright (c) 2015 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 149 matching lines @@
   if (rtp_video_header.simulcastIdx >= num_sending_modules_)
     return -1;
   stream_idx = rtp_video_header.simulcastIdx;
 
   return rtp_modules_[stream_idx]->SendOutgoingData(
       encoded_image._frameType, payload_type_, encoded_image._timeStamp,
       encoded_image.capture_time_ms_, encoded_image._buffer,
       encoded_image._length, fragmentation, &rtp_video_header);
 }
 
+void PayloadRouter::SetTargetSendBitrate(uint32_t bitrate_bps) {
+  rtc::CritScope lock(&crit_);
+  RTC_DCHECK_LE(streams_.size(), rtp_modules_.size());
+
+  // TODO(sprang): Rebase https://codereview.webrtc.org/1913073002/ on top of
+  // this.
+  int bitrate_remainder = bitrate_bps;
+  for (size_t i = 0; i < streams_.size() && bitrate_remainder > 0; ++i) {
+    int stream_bitrate = 0;
+    if (streams_[i].max_bitrate_bps > bitrate_remainder) {
+      stream_bitrate = bitrate_remainder;
+    } else {
+      stream_bitrate = streams_[i].max_bitrate_bps;
+    }
+    bitrate_remainder -= stream_bitrate;
+    rtp_modules_[i]->SetTargetSendBitrate(stream_bitrate);
+  }
+}
+
 size_t PayloadRouter::MaxPayloadLength() const {
   size_t min_payload_length = DefaultMaxPayloadLength();
   rtc::CritScope lock(&crit_);
   for (size_t i = 0; i < num_sending_modules_; ++i) {
     size_t module_payload_length = rtp_modules_[i]->MaxDataPayloadLength();
     if (module_payload_length < min_payload_length)
       min_payload_length = module_payload_length;
   }
   return min_payload_length;
 }
 
 }  // namespace webrtc