Enable passing receive stream ID to the decoder factory.

webrtc/api/rtpparameters.h

Index: webrtc/api/rtpparameters.h
diff --git a/webrtc/api/rtpparameters.h b/webrtc/api/rtpparameters.h
index 5c79ab4e9df571f1f4ef7c315c6efc4024bae84c..38adda9696803ead15d3b2364036f2981aa02b2a 100644
--- a/webrtc/api/rtpparameters.h
+++ b/webrtc/api/rtpparameters.h
@@ -19,11 +19,13 @@ 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 {
+  uint32_t ssrc;

[pthatcher1, 2016/06/16 19:34:38]

We could make this an rtc::optional<uint32_t>, since it's possible that it's not
set.

(We should probably do the same for max_bitrate_bps, but it looks like we'll
have to fix that later).

   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);