Fix DCHECK when track status changes in non-playing state

media/base/pipeline_impl.cc

 // Copyright (c) 2012 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 "media/base/pipeline_impl.h"
 
 #include <algorithm>
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
@@ skipping 560 matching lines @@
     const std::vector<MediaTrack::Id>& enabledTrackIds) {
   DCHECK(media_task_runner_->BelongsToCurrentThread());
 
   // Track status notifications might be delivered asynchronously. If we receive
   // a notification when pipeline is stopped/shut down, it's safe to ignore it.
   if (state_ == kStopping || state_ == kStopped) {
     return;
   }
 
   DCHECK(demuxer_);
-  DCHECK(shared_state_.renderer);
+  DCHECK(shared_state_.renderer || (state_ != kPlaying));
 
   base::TimeDelta currTime = (state_ == kPlaying)
                                  ? shared_state_.renderer->GetMediaTime()
                                  : demuxer_->GetStartTime();
   demuxer_->OnEnabledAudioTracksChanged(enabledTrackIds, currTime);
 }
 
 void PipelineImpl::RendererWrapper::OnSelectedVideoTrackChanged(
     const std::vector<MediaTrack::Id>& selectedTrackId) {
   DCHECK(media_task_runner_->BelongsToCurrentThread());
 
   // Track status notifications might be delivered asynchronously. If we receive
   // a notification when pipeline is stopped/shut down, it's safe to ignore it.
   if (state_ == kStopping || state_ == kStopped) {
     return;
   }
 
   DCHECK(demuxer_);
-  DCHECK(shared_state_.renderer);
+  DCHECK(shared_state_.renderer || (state_ != kPlaying));
 
   base::TimeDelta currTime = (state_ == kPlaying)
                                  ? shared_state_.renderer->GetMediaTime()
                                  : demuxer_->GetStartTime();
   demuxer_->OnSelectedVideoTrackChanged(selectedTrackId, currTime);
 }
 
 void PipelineImpl::RendererWrapper::OnStatisticsUpdate(
     const PipelineStatistics& stats) {
   DVLOG(3) << __func__;
@@ skipping 642 matching lines @@
 void PipelineImpl::OnSuspendDone() {
   DVLOG(3) << __func__;
   DCHECK(thread_checker_.CalledOnValidThread());
   DCHECK(IsRunning());
 
   DCHECK(!suspend_cb_.is_null());
   base::ResetAndReturn(&suspend_cb_).Run(PIPELINE_OK);
 }
 
 }  // namespace media