Adding C++ versions of currently spec'd "RtpParameters" structs.

webrtc/media/engine/webrtcvoiceengine.cc

 /*
  *  Copyright (c) 2004 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 502 matching lines @@
     {kPcmaCodecName, 8000, 1, 8, false, {10, 20, 30, 40, 50, 60}},
     {kCnCodecName, 32000, 1, 106, false, {}},
     {kCnCodecName, 16000, 1, 105, false, {}},
     {kCnCodecName, 8000, 1, 13, false, {}},
     {kDtmfCodecName, 48000, 1, 110, false, {}},
     {kDtmfCodecName, 32000, 1, 112, false, {}},
     {kDtmfCodecName, 16000, 1, 113, false, {}},
     {kDtmfCodecName, 8000, 1, 126, false, {}}
 };
 
+// |max_send_bitrate_bps| is the bitrate from "b=" in SDP.
+// |rtp_max_bitrate_bps| is the bitrate from RtpSender::SetParameters.
 rtc::Optional<int> ComputeSendBitrate(int max_send_bitrate_bps,
-                                      int rtp_max_bitrate_bps,
+                                      rtc::Optional<int> rtp_max_bitrate_bps,
                                       const webrtc::CodecInst& codec_inst) {
-  const int bps = MinPositive(max_send_bitrate_bps, rtp_max_bitrate_bps);
+  // If application-configured bitrate is set, take minimum of that and SDP
+  // bitrate.
+  const int bps = rtp_max_bitrate_bps
+                      ? MinPositive(max_send_bitrate_bps, *rtp_max_bitrate_bps)
+                      : max_send_bitrate_bps;
   const int codec_rate = codec_inst.rate;
 
   if (bps <= 0) {
     return rtc::Optional<int>(codec_rate);
   }
 
   if (codec_inst.pltype == -1) {
     return rtc::Optional<int>(codec_rate);
     ;
   }
@@ skipping 2177 matching lines @@
   RTC_DCHECK(worker_thread_checker_.CalledOnValidThread());
   const auto it = send_streams_.find(ssrc);
   if (it != send_streams_.end()) {
     return it->second->channel();
   }
   return -1;
 }
 }  // namespace cricket
 
 #endif  // HAVE_WEBRTC_VOICE