content::RTCRtpSenders/Receivers using track adapter references.

content/renderer/media/webrtc/rtc_rtp_sender.h

 // Copyright (c) 2017 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CONTENT_RENDERER_MEDIA_WEBRTC_RTC_RTP_SENDER_H_
 #define CONTENT_RENDERER_MEDIA_WEBRTC_RTC_RTP_SENDER_H_
 
 #include "base/memory/ref_counted.h"
 #include "content/common/content_export.h"
+#include "content/renderer/media/webrtc/webrtc_media_stream_track_adapter_map.h"
 #include "third_party/WebKit/public/platform/WebMediaStreamTrack.h"
 #include "third_party/WebKit/public/platform/WebRTCRtpSender.h"
 #include "third_party/webrtc/api/rtpsenderinterface.h"
 
 namespace content {
 
 // Used to surface |webrtc::RtpSenderInterface| to blink. Multiple
 // |RTCRtpSender|s could reference the same webrtc receiver; |id| is the value
 // of the pointer to the webrtc sender.
 class CONTENT_EXPORT RTCRtpSender : public blink::WebRTCRtpSender {
  public:
   static uintptr_t getId(const webrtc::RtpSenderInterface* webrtc_rtp_sender);
 
-  RTCRtpSender(webrtc::RtpSenderInterface* webrtc_rtp_sender,
-               std::unique_ptr<blink::WebMediaStreamTrack> web_track);
+  RTCRtpSender(scoped_refptr<webrtc::RtpSenderInterface> webrtc_rtp_sender,
+               std::unique_ptr<WebRtcMediaStreamTrackAdapterMap::AdapterRef>
+                   track_adapter);
   ~RTCRtpSender() override;
 
   uintptr_t Id() const override;
   const blink::WebMediaStreamTrack* Track() const override;
 
   const webrtc::MediaStreamTrackInterface* webrtc_track() const;
 
  private:
   const scoped_refptr<webrtc::RtpSenderInterface> webrtc_rtp_sender_;
-  std::unique_ptr<blink::WebMediaStreamTrack> web_track_;
+  // The track adapter is the glue between blink and webrtc layer tracks.
+  // Keeping a reference to the adapter ensures it is not disposed, as is
+  // required as long as the webrtc layer track is in use by the sender.
+  std::unique_ptr<WebRtcMediaStreamTrackAdapterMap::AdapterRef> track_adapter_;
 };
 
 }  // namespace content
 
 #endif  // CONTENT_RENDERER_MEDIA_WEBRTC_RTC_RTP_SENDER_H_