MediaRecorder: ignored disabled audio/video tracks on MR start

content/renderer/media/media_recorder_handler.cc

 // Copyright 2015 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_recorder_handler.h"
 
 #include <utility>
 
 #include "base/bind.h"
 #include "base/location.h"
@@ skipping 116 matching lines @@
 
   blink::WebVector<blink::WebMediaStreamTrack> video_tracks, audio_tracks;
   media_stream_.videoTracks(video_tracks);
   media_stream_.audioTracks(audio_tracks);
 
   if (video_tracks.isEmpty() && audio_tracks.isEmpty()) {
     LOG(WARNING) << __FUNCTION__ << ": no media tracks.";
     return false;
   }
 
+  const bool use_video_tracks =
+      !video_tracks.isEmpty() && video_tracks[0].isEnabled();
   const bool use_audio_tracks =
-      !audio_tracks.isEmpty() && MediaStreamAudioTrack::From(audio_tracks[0]);
+      !audio_tracks.isEmpty() && MediaStreamAudioTrack::From(audio_tracks[0])
+       && audio_tracks[0].isEnabled();
 
   webm_muxer_.reset(new media::WebmMuxer(
-      use_vp9_ ? media::kCodecVP9 : media::kCodecVP8,
-      video_tracks.size() > 0, use_audio_tracks,
-      base::Bind(&MediaRecorderHandler::WriteData,
-                 weak_factory_.GetWeakPtr())));
+      use_vp9_ ? media::kCodecVP9 : media::kCodecVP8, use_video_tracks,
+      use_audio_tracks, base::Bind(&MediaRecorderHandler::WriteData,
+                                   weak_factory_.GetWeakPtr())));
 
-  if (!video_tracks.isEmpty()) {
+  if (use_video_tracks) {
     // TODO(mcasas): The muxer API supports only one video track. Extend it to
     // several video tracks, see http://crbug.com/528523.
     LOG_IF(WARNING, video_tracks.size() > 1u)
         << "Recording multiple video tracks is not implemented. "
         << "Only recording first video track.";
     const blink::WebMediaStreamTrack& video_track = video_tracks[0];
     if (video_track.isNull())
       return false;
 
     const VideoTrackRecorder::OnEncodedVideoCB on_encoded_video_cb =
@@ skipping 103 matching lines @@
     recorder->OnData(audio_bus, timestamp);
 }
 
 void MediaRecorderHandler::SetAudioFormatForTesting(
     const media::AudioParameters& params) {
   for (auto* recorder : audio_recorders_)
     recorder->OnSetFormat(params);
 }
 
 }  // namespace content