Hook up AudioDeviceListenerWin to monitor all default device changes.

content/browser/media/media_internals.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 "content/browser/media/media_internals.h"
 
 #include "base/strings/string16.h"
+#include "base/strings/string_number_conversions.h"
 #include "base/strings/stringprintf.h"
 #include "content/public/browser/browser_thread.h"
 #include "content/public/browser/web_ui.h"
 #include "media/audio/audio_parameters.h"
 #include "media/base/media_log.h"
 #include "media/base/media_log_event.h"
 
 namespace {
 
 static base::LazyInstance<content::MediaInternals>::Leaky g_media_internals =
     LAZY_INSTANCE_INITIALIZER;
 
 base::string16 SerializeUpdate(const std::string& function,
                                const base::Value* value) {
   return content::WebUI::GetJavascriptCall(
       function, std::vector<const base::Value*>(1, value));
 }
 
+std::string EffectsToString(int effects) {
+  if (effects == media::AudioParameters::NO_EFFECTS)
+    return "NO_EFFECTS";
+
+  struct {
+    int flag;
+    const char* name;
+  } flags[] = {
+    { media::AudioParameters::ECHO_CANCELLER, "ECHO_CANCELLER" },
+    { media::AudioParameters::DUCKING, "DUCKING" },
+  };
+
+  std::string ret;
+  for (size_t i = 0; i < ARRAYSIZE_UNSAFE(flags); ++i) {
+    if (effects & flags[i].flag) {
+      if (!ret.empty())
+        ret += " | ";
+      ret += flags[i].name;
+      effects &= ~flags[i].flag;
+    }
+  }
+
+  if (effects) {
+    if (!ret.empty())
+      ret += " | ";
+    ret += base::IntToString(effects);
+  }
+
+  return ret;
+}
+
 const char kAudioLogStatusKey[] = "status";
 const char kAudioLogUpdateFunction[] = "media.updateAudioComponent";
 
 }  // namespace
 
 namespace content {
 
 class AudioLogImpl : public media::AudioLog {
  public:
   AudioLogImpl(int owner_id,
@@ skipping 40 matching lines @@
   StoreComponentMetadata(component_id, &dict);
 
   dict.SetString(kAudioLogStatusKey, "created");
   dict.SetString("device_id", device_id);
   dict.SetInteger("input_channels", params.input_channels());
   dict.SetInteger("frames_per_buffer", params.frames_per_buffer());
   dict.SetInteger("sample_rate", params.sample_rate());
   dict.SetInteger("channels", params.channels());
   dict.SetString("channel_layout",
                  ChannelLayoutToString(params.channel_layout()));
+  dict.SetString("effects", EffectsToString(params.effects()));
 
   media_internals_->SendUpdateAndCache(
       FormatCacheKey(component_id), kAudioLogUpdateFunction, &dict);
 }
 
 void AudioLogImpl::OnStarted(int component_id) {
   SendSingleStringUpdate(component_id, kAudioLogStatusKey, "started");
 }
 
 void AudioLogImpl::OnStopped(int component_id) {
@@ skipping 137 matching lines @@
     const std::string& function,
     const base::DictionaryValue* value) {
   SendUpdate(SerializeUpdate(function, value));
 
   base::AutoLock auto_lock(lock_);
   scoped_ptr<base::Value> out_value;
   CHECK(cached_data_.Remove(cache_key, &out_value));
 }
 
 }  // namespace content