Potential fix for rtx/red issue where red is removed only from the remote description.

webrtc/media/engine/webrtcvideoengine2.h

 /*
  *  Copyright (c) 2014 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 404 matching lines @@
   // rtc::VideoSinkInterface<cricket::VideoFrame>.
   class WebRtcVideoReceiveStream
       : public rtc::VideoSinkInterface<webrtc::VideoFrame> {
    public:
     WebRtcVideoReceiveStream(
         webrtc::Call* call,
         const StreamParams& sp,
         const webrtc::VideoReceiveStream::Config& config,
         WebRtcVideoDecoderFactory* external_decoder_factory,
         bool default_stream,
-        const std::vector<VideoCodecSettings>& recv_codecs);
+        const std::vector<VideoCodecSettings>& recv_codecs,
+        bool red_disabled_by_remote_side);
     ~WebRtcVideoReceiveStream();
 
     const std::vector<uint32_t>& GetSsrcs() const;
 
     void SetLocalSsrc(uint32_t local_ssrc);
     // TODO(deadbeef): Move these feedback parameters into the recv parameters.
     void SetFeedbackParameters(bool nack_enabled,
                                bool remb_enabled,
                                bool transport_cc_enabled,
                                webrtc::RtcpMode rtcp_mode);
     void SetRecvParameters(const ChangedRecvParameters& recv_params);
 
     void OnFrame(const webrtc::VideoFrame& frame) override;
     bool IsDefaultStream() const;
 
     void SetSink(rtc::VideoSinkInterface<cricket::VideoFrame>* sink);
 
     VideoReceiverInfo GetVideoReceiverInfo();
 
+    // Used to disable RED/FEC when the remote description doesn't contain those
+    // codecs. This is needed to be able to work around an RTX bug which is only
+    // happening if the remote side doesn't send RED, but the local side is
+    // configured to receive RED.
+    // TODO(holmer): Remove this after a couple of Chrome versions, M53-54
+    // time frame.
+    void SetFecDisabledRemotely(bool disable);
+
    private:
     struct AllocatedDecoder {
       AllocatedDecoder(webrtc::VideoDecoder* decoder,
                        webrtc::VideoCodecType type,
                        bool external);
       webrtc::VideoDecoder* decoder;
       // Decoder wrapped into a fallback decoder to permit software fallback.
       webrtc::VideoDecoder* external_decoder;
       webrtc::VideoCodecType type;
       bool external;
@@ skipping 10 matching lines @@
 
     std::string GetCodecNameFromPayloadType(int payload_type);
 
     webrtc::Call* const call_;
     const std::vector<uint32_t> ssrcs_;
     const std::vector<SsrcGroup> ssrc_groups_;
 
     webrtc::VideoReceiveStream* stream_;
     const bool default_stream_;
     webrtc::VideoReceiveStream::Config config_;
+    bool red_disabled_by_remote_side_;
 
     WebRtcVideoDecoderFactory* const external_decoder_factory_;
     std::vector<AllocatedDecoder> allocated_decoders_;
 
     rtc::CriticalSection sink_lock_;
     rtc::VideoSinkInterface<cricket::VideoFrame>* sink_ GUARDED_BY(sink_lock_);
     int last_width_ GUARDED_BY(sink_lock_);
     int last_height_ GUARDED_BY(sink_lock_);
     // Expands remote RTP timestamps to int64_t to be able to estimate how long
     // the stream has been running.
@@ skipping 50 matching lines @@
   WebRtcVideoEncoderFactory* const external_encoder_factory_;
   WebRtcVideoDecoderFactory* const external_decoder_factory_;
   std::vector<VideoCodecSettings> recv_codecs_;
   std::vector<webrtc::RtpExtension> recv_rtp_extensions_;
   webrtc::Call::Config::BitrateConfig bitrate_config_;
   // TODO(deadbeef): Don't duplicate information between
   // send_params/recv_params, rtp_extensions, options, etc.
   VideoSendParameters send_params_;
   VideoOptions default_send_options_;
   VideoRecvParameters recv_params_;
+  bool red_disabled_by_remote_side_;
 };
 
 }  // namespace cricket
 
 #endif  // WEBRTC_MEDIA_ENGINE_WEBRTCVIDEOENGINE2_H_