Reduce VideoSendStream recreations due to FlexFEC.

webrtc/media/engine/webrtcvideoengine2.h

Index: webrtc/media/engine/webrtcvideoengine2.h
diff --git a/webrtc/media/engine/webrtcvideoengine2.h b/webrtc/media/engine/webrtcvideoengine2.h
index 2c7d36ccb5cc820b5d20fa6317d1dbc950ca0f49..8a1d282c2ce83fe60752f98a980ecbcc49c82114 100644
--- a/webrtc/media/engine/webrtcvideoengine2.h
+++ b/webrtc/media/engine/webrtcvideoengine2.h
@@ -250,7 +250,8 @@ class WebRtcVideoChannel2 : public VideoMediaChannel, public webrtc::Transport {
         int max_bitrate_bps,
         const rtc::Optional<VideoCodecSettings>& codec_settings,
         const rtc::Optional<std::vector<webrtc::RtpExtension>>& rtp_extensions,
-        const VideoSendParameters& send_params);
+        const VideoSendParameters& send_params,
+        bool map_flexfec_send);
     virtual ~WebRtcVideoSendStream();
 
     void SetSendParameters(const ChangedSendParameters& send_params);
@@ -452,8 +453,11 @@ class WebRtcVideoChannel2 : public VideoMediaChannel, public webrtc::Transport {
                const webrtc::PacketOptions& options) override;
   bool SendRtcp(const uint8_t* data, size_t len) override;
 
+  // If |map_flexfec| is true, any "flexfec-03" codec payload type will be

[perkj_webrtc, 2017/05/12 08:37:23]

/s types

[brandtr, 2017/05/12 09:04:33]

There should never be multiple FlexFEC payload types. Either there is none, or
there is one. Updated the comment to be more clear about that.

+  // attached to the VideoCodecSettings of the media codecs.
   static std::vector<VideoCodecSettings> MapCodecs(
-      const std::vector<VideoCodec>& codecs);
+      const std::vector<VideoCodec>& codecs,
+      bool map_flexfec);
   // Select what video codec will be used for sending, i.e. what codec is used
   // for local encoding, based on supported remote codecs. The first remote
   // codec that is supported locally will be selected.
@@ -503,6 +507,9 @@ class WebRtcVideoChannel2 : public VideoMediaChannel, public webrtc::Transport {
   VideoOptions default_send_options_;
   VideoRecvParameters recv_params_;
   int64_t last_stats_log_ms_;
+
+  const bool map_flexfec_recv_;
+  const bool map_flexfec_send_;
 };
 
 }  // namespace cricket