Use AudioStreamMonitor to control power save blocking.

content/browser/renderer_host/media/audio_renderer_host.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/renderer_host/media/audio_renderer_host.h"
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
 #include "base/memory/shared_memory.h"
 #include "base/metrics/histogram.h"
 #include "base/process/process.h"
 #include "content/browser/browser_main_loop.h"
 #include "content/browser/media/capture/audio_mirroring_manager.h"
 #include "content/browser/media/media_internals.h"
 #include "content/browser/renderer_host/media/audio_input_device_manager.h"
 #include "content/browser/renderer_host/media/audio_sync_reader.h"
 #include "content/browser/renderer_host/media/media_stream_manager.h"
 #include "content/common/media/audio_messages.h"
 #include "content/public/browser/content_browser_client.h"
 #include "content/public/browser/media_observer.h"
 #include "content/public/common/content_switches.h"
 #include "media/audio/audio_manager_base.h"
 #include "media/base/audio_bus.h"
 #include "media/base/limits.h"
 
+// Only do audio stream monitoring for platforms that use it for the tab media
+// indicator UI or the OOM killer.
+#if !defined(OS_ANDROID) && !defined(OS_IOS)
+#define AUDIO_STREAM_MONITORING

[DaleCurtis, 2014/08/29 23:56:47]

It's unfortunate to define this everywhere. I'm open to suggestions such as
stubbing out the ASM methods for Android/IOS so multiple places don't have this
define gunk.

+#include "content/browser/media/audio_stream_monitor.h"
+#endif
+
 using media::AudioBus;
 using media::AudioManager;
 
 namespace content {
 
 class AudioRendererHost::AudioEntry
     : public media::AudioOutputController::EventHandler {
  public:
   AudioEntry(AudioRendererHost* host,
              int stream_id,
@@ skipping 229 matching lines @@
 
   AudioEntry* const entry = LookupById(stream_id);
   if (!entry)
     return;
 
   Send(new AudioMsg_NotifyStreamStateChanged(
       stream_id,
       is_playing ? media::AudioOutputIPCDelegate::kPlaying
                  : media::AudioOutputIPCDelegate::kPaused));
 
-  MediaObserver* const media_observer =
-      GetContentClient()->browser()->GetMediaObserver();
-  if (media_observer) {
-    if (is_playing) {
-      media_observer->OnAudioStreamPlaying(
-          render_process_id_,
-          entry->render_frame_id(),
-          entry->stream_id(),
-          base::Bind(&media::AudioOutputController::ReadCurrentPowerAndClip,
-                     entry->controller()));
-      if (!entry->playing()) {
-        entry->set_playing(true);
-        base::AtomicRefCountInc(&num_playing_streams_);
-      }
-    } else {
-      media_observer->OnAudioStreamStopped(render_process_id_,
-                                           entry->render_frame_id(),
-                                           entry->stream_id());
-      if (entry->playing()) {
-        entry->set_playing(false);
-        base::AtomicRefCountDec(&num_playing_streams_);
-      }
+  if (is_playing) {
+#if defined(AUDIO_STREAM_MONITORING)
+    AudioStreamMonitor::StartMonitoringStream(
+        render_process_id_,
+        entry->render_frame_id(),
+        entry->stream_id(),
+        base::Bind(&media::AudioOutputController::ReadCurrentPowerAndClip,
+                   entry->controller()));
+#endif
+    // TODO(dalecurtis): See about using AudioStreamMonitor instead.
+    if (!entry->playing()) {
+      entry->set_playing(true);
+      base::AtomicRefCountInc(&num_playing_streams_);
+    }
+  } else {
+#if defined(AUDIO_STREAM_MONITORING)
+    AudioStreamMonitor::StopMonitoringStream(
+        render_process_id_, entry->render_frame_id(), entry->stream_id());
+#endif
+    // TODO(dalecurtis): See about using AudioStreamMonitor instead.
+    if (entry->playing()) {
+      entry->set_playing(false);
+      base::AtomicRefCountDec(&num_playing_streams_);
     }
   }
 }
 
 RenderViewHost::AudioOutputControllerList
 AudioRendererHost::DoGetOutputControllers(int render_view_id) const {
   DCHECK_CURRENTLY_ON(BrowserThread::IO);
 
   RenderViewHost::AudioOutputControllerList controllers;
   AudioEntryMap::const_iterator it = audio_entries_.begin();
@@ skipping 149 matching lines @@
     mirroring_manager_->RemoveDiverter(
         render_process_id_, entry->render_view_id(), controller);
   }
   controller->Close(
       base::Bind(&AudioRendererHost::DeleteEntry, this, base::Passed(&entry)));
   audio_log_->OnClosed(stream_id);
 }
 
 void AudioRendererHost::DeleteEntry(scoped_ptr<AudioEntry> entry) {
   DCHECK_CURRENTLY_ON(BrowserThread::IO);
-
-  // At this point, make the final "say" in audio playback state.
-  MediaObserver* const media_observer =
-      GetContentClient()->browser()->GetMediaObserver();
-  if (media_observer) {
-    media_observer->OnAudioStreamStopped(render_process_id_,
-                                         entry->render_frame_id(),
-                                         entry->stream_id());
-    if (entry->playing())
-      base::AtomicRefCountDec(&num_playing_streams_);
-  }
+#if defined(AUDIO_STREAM_MONITORING)
+  AudioStreamMonitor::StopMonitoringStream(
+      render_process_id_, entry->render_frame_id(), entry->stream_id());
+#endif
+  if (entry->playing())
+    base::AtomicRefCountDec(&num_playing_streams_);
 }
 
 void AudioRendererHost::ReportErrorAndClose(int stream_id) {
   DCHECK_CURRENTLY_ON(BrowserThread::IO);
 
   // Make sure this isn't a stray callback executing after the stream has been
   // closed, so error notifications aren't sent after clients believe the stream
   // is closed.
   if (!LookupById(stream_id))
     return;
 
   SendErrorMessage(stream_id);
 
   audio_log_->OnError(stream_id);
   OnCloseStream(stream_id);
 }
 
 AudioRendererHost::AudioEntry* AudioRendererHost::LookupById(int stream_id) {
   DCHECK_CURRENTLY_ON(BrowserThread::IO);
 
   AudioEntryMap::const_iterator i = audio_entries_.find(stream_id);
   return i != audio_entries_.end() ? i->second : NULL;
 }
 
 bool AudioRendererHost::HasActiveAudio() {
   return !base::AtomicRefCountIsZero(&num_playing_streams_);
 }
 
 }  // namespace content