Caching AudioOutputDevice instances in mixer manager

media/base/fake_audio_renderer_sink.cc

 // Copyright 2013 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/fake_audio_renderer_sink.h"
 
 #include "base/bind.h"
 #include "base/location.h"
 #include "base/logging.h"
 
 namespace media {
 
 FakeAudioRendererSink::FakeAudioRendererSink()
+    : FakeAudioRendererSink(
+          AudioParameters(AudioParameters::AUDIO_FAKE,
+                          CHANNEL_LAYOUT_STEREO,
+                          AudioParameters::kTelephoneSampleRate,
+                          16,
+                          1)) {}
+
+FakeAudioRendererSink::FakeAudioRendererSink(
+    const AudioParameters& hardware_params)
     : state_(kUninitialized),
-      callback_(NULL),
-      output_device_info_(
-          std::string(),
-          OUTPUT_DEVICE_STATUS_OK,
-          media::AudioParameters(media::AudioParameters::AUDIO_FAKE,
-                                 media::CHANNEL_LAYOUT_STEREO,
-                                 media::AudioParameters::kTelephoneSampleRate,
-                                 16,
-                                 1)) {}
+      callback_(nullptr),
+      output_device_info_(std::string(),
+                          OUTPUT_DEVICE_STATUS_OK,
+                          hardware_params) {}
 
 FakeAudioRendererSink::~FakeAudioRendererSink() {
   DCHECK(!callback_);
 }
 
 void FakeAudioRendererSink::Initialize(const AudioParameters& params,
                                        RenderCallback* callback) {
   DCHECK_EQ(state_, kUninitialized);
   DCHECK(!callback_);
   DCHECK(callback);
@@ skipping 57 matching lines @@
     "kPlaying",
     "kStopped"
   };
 
   DVLOG(1) << __FUNCTION__ << " : "
            << kStateNames[state_] << " -> " << kStateNames[new_state];
   state_ = new_state;
 }
 
 }  // namespace media