WebContentsAudioMuter: Mute all audio output from a WebContentsImpl.

content/browser/web_contents/web_contents_impl.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/web_contents/web_contents_impl.h"
 
 #include <utility>
 
 #include "base/command_line.h"
 #include "base/debug/trace_event.h"
@@ skipping 22 matching lines @@
 #include "content/browser/frame_host/interstitial_page_impl.h"
 #include "content/browser/frame_host/navigation_entry_impl.h"
 #include "content/browser/frame_host/navigator_impl.h"
 #include "content/browser/frame_host/render_frame_host_impl.h"
 #include "content/browser/frame_host/render_widget_host_view_child_frame.h"
 #include "content/browser/geolocation/geolocation_dispatcher_host.h"
 #include "content/browser/host_zoom_map_impl.h"
 #include "content/browser/loader/resource_dispatcher_host_impl.h"
 #include "content/browser/manifest/manifest_manager_host.h"
 #include "content/browser/media/audio_stream_monitor.h"
+#include "content/browser/media/capture/web_contents_audio_muter.h"
 #include "content/browser/media/midi_dispatcher_host.h"
 #include "content/browser/message_port_message_filter.h"
 #include "content/browser/message_port_service.h"
 #include "content/browser/power_save_blocker_impl.h"
 #include "content/browser/renderer_host/render_process_host_impl.h"
 #include "content/browser/renderer_host/render_view_host_delegate_view.h"
 #include "content/browser/renderer_host/render_view_host_impl.h"
 #include "content/browser/renderer_host/render_widget_host_impl.h"
 #include "content/browser/renderer_host/render_widget_host_view_base.h"
 #include "content/browser/screen_orientation/screen_orientation_dispatcher_host_impl.h"
@@ skipping 927 matching lines @@
   if (IsHidden()) {
     DVLOG(1) << "Executing delayed WasHidden().";
     WasHidden();
   }
 }
 
 int WebContentsImpl::GetCapturerCount() const {
   return capturer_count_;
 }
 
+bool WebContentsImpl::IsAudioMuted() const {
+  return audio_muter_.get() && audio_muter_->is_muting();
+}
+
+void WebContentsImpl::SetAudioMuted(bool mute) {
+  DVLOG(1) << "SetAudioMuted(mute=" << mute << "), was " << IsAudioMuted()
+           << " for WebContentsImpl@" << this;
+
+  if (mute == IsAudioMuted())
+    return;
+
+  if (mute) {
+    if (!audio_muter_.get())

[DaleCurtis, 2014/09/22 17:45:45]

No need for .get() these days for a boolean test.

+      audio_muter_.reset(new WebContentsAudioMuter(this));
+    audio_muter_->StartMuting();
+  } else {
+    DCHECK(audio_muter_.get());

[DaleCurtis, 2014/09/22 17:45:45]

Ditto.

+    audio_muter_->StopMuting();
+  }
+
+  // Notification for UI updates in response to the changed muting state.
+  NotifyNavigationStateChanged(INVALIDATE_TYPE_TAB);
+}
+
 bool WebContentsImpl::IsCrashed() const {
   return (crashed_status_ == base::TERMINATION_STATUS_PROCESS_CRASHED ||
           crashed_status_ == base::TERMINATION_STATUS_ABNORMAL_TERMINATION ||
           crashed_status_ == base::TERMINATION_STATUS_PROCESS_WAS_KILLED);
 }
 
 void WebContentsImpl::SetIsCrashed(base::TerminationStatus status,
                                    int error_code) {
   if (status == crashed_status_)
     return;
@@ skipping 3366 matching lines @@
   node->render_manager()->ResumeResponseDeferredAtStart();
 }
 
 void WebContentsImpl::SetForceDisableOverscrollContent(bool force_disable) {
   force_disable_overscroll_content_ = force_disable;
   if (view_)
     view_->SetOverscrollControllerEnabled(CanOverscrollContent());
 }
 
 }  // namespace content