Video Capture: Allow suspension of individual devices.

content/renderer/media/media_stream_video_source.cc

 // Copyright 2014 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.
 
 #include "content/renderer/media/media_stream_video_source.h"
 
 #include <algorithm>
 #include <limits>
 #include <string>
 
@@ skipping 375 matching lines @@
   }
 
   // Call |frame_adapter_->RemoveTrack| here even if adding the track has
   // failed and |frame_adapter_->AddCallback| has not been called.
   track_adapter_->RemoveTrack(video_track);
 
   if (tracks_.empty())
     StopSource();
 }
 
+void MediaStreamVideoSource::UpdateHasConsumers(MediaStreamVideoTrack* track,
+                                                bool has_consumers) {
+  DCHECK(CalledOnValidThread());
+  const auto it =
+      std::find(suspended_tracks_.begin(), suspended_tracks_.end(), track);
+  if (has_consumers) {
+    if (it != suspended_tracks_.end())
+      suspended_tracks_.erase(it);
+  } else {
+    if (it == suspended_tracks_.end())
+      suspended_tracks_.push_back(track);
+  }
+  OnHasConsumers(suspended_tracks_.size() < tracks_.size());
+}
+
 void MediaStreamVideoSource::UpdateCapturingLinkSecure(
-    MediaStreamVideoTrack* track,
-    bool is_secure) {
+    MediaStreamVideoTrack* track, bool is_secure) {
+  DCHECK(CalledOnValidThread());
   secure_tracker_.Update(track, is_secure);
-  SetCapturingLinkSecured(secure_tracker_.is_capturing_secure());
+  OnCapturingLinkSecured(secure_tracker_.is_capturing_secure());
 }
 
 base::SingleThreadTaskRunner* MediaStreamVideoSource::io_task_runner() const {
   DCHECK(CalledOnValidThread());
   return track_adapter_->io_task_runner();
 }
 
 const media::VideoCaptureFormat*
     MediaStreamVideoSource::GetCurrentFormat() const {
   DCHECK(CalledOnValidThread());
@@ skipping 179 matching lines @@
       callback(callback) {
 }
 
 MediaStreamVideoSource::TrackDescriptor::TrackDescriptor(
     const TrackDescriptor& other) = default;
 
 MediaStreamVideoSource::TrackDescriptor::~TrackDescriptor() {
 }
 
 }  // namespace content