Enable passing receive stream ID to the decoder factory.

webrtc/api/rtpparameters.h

 /*
  *  Copyright 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.
  */
 
 #ifndef WEBRTC_API_RTPPARAMETERS_H_
 #define WEBRTC_API_RTPPARAMETERS_H_
 
 #include <string>
 #include <vector>
 
+#include "webrtc/base/optional.h"
+
 namespace webrtc {
 
 // These structures are defined as part of the RtpSender interface.
 // See http://w3c.github.io/webrtc-pc/#rtcrtpsender-interface for details.
 struct RtpEncodingParameters {
+  rtc::Optional<uint32_t> ssrc;
   bool active = true;
   int max_bitrate_bps = -1;
 
   bool operator==(const RtpEncodingParameters& o) const {
-    return active == o.active && max_bitrate_bps == o.max_bitrate_bps;
+    return ssrc == o.ssrc && active == o.active &&
+           max_bitrate_bps == o.max_bitrate_bps;
   }
   bool operator!=(const RtpEncodingParameters& o) const {
     return !(*this == o);
   }
 };
 
 struct RtpCodecParameters {
   int payload_type;
   std::string mime_type;
   int clock_rate;
@@ skipping 13 matching lines @@
 
   bool operator==(const RtpParameters& o) const {
     return encodings == o.encodings && codecs == o.codecs;
   }
   bool operator!=(const RtpParameters& o) const { return !(*this == o); }
 };
 
 }  // namespace webrtc
 
 #endif  // WEBRTC_API_RTPPARAMETERS_H_