Ensures that audio tasks cannot run after AudioManager is deleted.

chromecast/media/audio/cast_audio_manager.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 "chromecast/media/audio/cast_audio_manager.h"
 
 #include <algorithm>
 #include <string>
 
 #include "base/bind.h"
@@ skipping 10 matching lines @@
 // TODO(alokp): Query the preferred value from media backend.
 static const int kMinimumOutputBufferSize = 512;
 static const int kMaximumOutputBufferSize = 8192;
 static const int kDefaultOutputBufferSize = 2048;
 }  // namespace
 
 namespace chromecast {
 namespace media {
 
 CastAudioManager::CastAudioManager(
-    scoped_refptr<base::SingleThreadTaskRunner> task_runner,
-    scoped_refptr<base::SingleThreadTaskRunner> worker_task_runner,
+    std::unique_ptr<::media::AudioThread> audio_thread,
     ::media::AudioLogFactory* audio_log_factory,
     MediaPipelineBackendManager* backend_manager)
-    : CastAudioManager(task_runner,
-                       worker_task_runner,
+    : CastAudioManager(std::move(audio_thread),
                        audio_log_factory,
                        backend_manager,
                        new CastAudioMixer(
                            base::Bind(&CastAudioManager::MakeMixerOutputStream,
                                       base::Unretained(this)))) {}
 
 CastAudioManager::CastAudioManager(
-    scoped_refptr<base::SingleThreadTaskRunner> task_runner,
-    scoped_refptr<base::SingleThreadTaskRunner> worker_task_runner,
+    std::unique_ptr<::media::AudioThread> audio_thread,
     ::media::AudioLogFactory* audio_log_factory,
     MediaPipelineBackendManager* backend_manager,
     CastAudioMixer* audio_mixer)
-    : AudioManagerBase(std::move(task_runner),
-                       std::move(worker_task_runner),
-                       audio_log_factory),
+    : AudioManagerBase(std::move(audio_thread), audio_log_factory),
       backend_manager_(backend_manager),
       mixer_(audio_mixer) {}
 
-CastAudioManager::~CastAudioManager() {
-  Shutdown();
-}
+CastAudioManager::~CastAudioManager() = default;
 
 bool CastAudioManager::HasAudioOutputDevices() {
   return true;
 }
 
 bool CastAudioManager::HasAudioInputDevices() {
   return false;
 }
 
 void CastAudioManager::ShowAudioInputSettings() {
@@ skipping 111 matching lines @@
   DCHECK(!mixer_output_stream_);  // Only allow 1 |mixer_output_stream_|.
 
   // Keep a reference to this stream for proper behavior on
   // CastAudioManager::ReleaseOutputStream.
   mixer_output_stream_.reset(new CastAudioOutputStream(params, this));
   return mixer_output_stream_.get();
 }
 
 }  // namespace media
 }  // namespace chromecast