DCHECK that audio devices are stopped prior to destruction.

media/audio/audio_output_device.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/audio/audio_output_device.h"
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include <cmath>
@@ skipping 78 matching lines @@
 }
 
 void AudioOutputDevice::Initialize(const AudioParameters& params,
                                    RenderCallback* callback) {
   DCHECK(!callback_) << "Calling Initialize() twice?";
   DCHECK(params.IsValid());
   audio_parameters_ = params;
   callback_ = callback;
 }
 
-AudioOutputDevice::~AudioOutputDevice() {}
+AudioOutputDevice::~AudioOutputDevice() {
+#if DCHECK_IS_ON()
+  // Make sure we've stopped the stream properly before destructing |this|.
+  DCHECK(audio_thread_lock_.Try());
+  DCHECK_LE(state_, IDLE);
+  DCHECK(!audio_thread_);
+  DCHECK(!audio_callback_);
+  DCHECK(!stopping_hack_);
+  audio_thread_lock_.Release();
+#endif  // DCHECK_IS_ON()
+}
 
 void AudioOutputDevice::RequestDeviceAuthorization() {
   task_runner()->PostTask(
       FROM_HERE,
       base::Bind(&AudioOutputDevice::RequestDeviceAuthorizationOnIOThread,
                  this));
 }
 
 void AudioOutputDevice::Start() {
   DCHECK(callback_) << "Initialize hasn't been called";
@@ skipping 377 matching lines @@
   render_callback_->Render(delay, delay_timestamp, frames_skipped,
                            output_bus_.get());
 }
 
 bool AudioOutputDevice::AudioThreadCallback::
     CurrentThreadIsAudioDeviceThread() {
   return thread_checker_.CalledOnValidThread();
 }
 
 }  // namespace media