Replace AudioSilenceDetector with an AudioPowerMonitor.

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 <algorithm>
+
 #include "base/bind.h"
 #include "base/bind_helpers.h"
 #include "base/command_line.h"
 #include "base/metrics/histogram.h"
 #include "base/process.h"
 #include "base/shared_memory.h"
 #include "content/browser/browser_main_loop.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_mirroring_manager.h"
@@ skipping 39 matching lines @@
   }
 
   media::AudioOutputController::SyncReader* reader() const {
     return reader_.get();
   }
 
  private:
   // media::AudioOutputController::EventHandler implementation.
   virtual void OnCreated() OVERRIDE;
   virtual void OnPlaying() OVERRIDE;
-  virtual void OnAudible(bool is_audible) OVERRIDE;
+  virtual void OnPowerMeasured(float power_dBFS, bool clipped) OVERRIDE;
   virtual void OnPaused() OVERRIDE;
   virtual void OnError() OVERRIDE;
   virtual void OnDeviceChange(int new_buffer_size, int new_sample_rate)
       OVERRIDE;
 
   AudioRendererHost* const host_;
   const int stream_id_;
 
   // The routing ID of the source render view.
   const int render_view_id_;
@@ skipping 73 matching lines @@
 void AudioRendererHost::AudioEntry::OnPlaying() {
   BrowserThread::PostTask(
       BrowserThread::IO,
       FROM_HERE,
       base::Bind(
           base::IgnoreResult(&AudioRendererHost::Send), host_,
           new AudioMsg_NotifyStreamStateChanged(
               stream_id_, media::AudioOutputIPCDelegate::kPlaying)));
 }
 
-void AudioRendererHost::AudioEntry::OnAudible(bool is_audible) {
+void AudioRendererHost::AudioEntry::OnPowerMeasured(float power_dBFS,
+                                                    bool clipped) {
   BrowserThread::PostTask(
       BrowserThread::IO,
       FROM_HERE,
-      base::Bind(&AudioRendererHost::DoNotifyAudibleState, host_,
-                 this, is_audible));
+      base::Bind(&AudioRendererHost::DoNotifyAudioPowerLevel, host_,
+                 this, power_dBFS, clipped));
 }
 
 void AudioRendererHost::AudioEntry::OnPaused() {
   BrowserThread::PostTask(
       BrowserThread::IO,
       FROM_HERE,
       base::Bind(
           base::IgnoreResult(&AudioRendererHost::Send), host_,
           new AudioMsg_NotifyStreamStateChanged(
               stream_id_, media::AudioOutputIPCDelegate::kPaused)));
@@ skipping 52 matching lines @@
     return;
   }
 
   Send(new AudioMsg_NotifyStreamCreated(
       entry->stream_id(),
       foreign_memory_handle,
       foreign_socket_handle,
       media::PacketSizeInBytes(entry->shared_memory()->requested_size())));
 }
 
-void AudioRendererHost::DoNotifyAudibleState(AudioEntry* entry,
-                                             bool is_audible) {
+void AudioRendererHost::DoNotifyAudioPowerLevel(AudioEntry* entry,
+                                                float power_dBFS,
+                                                bool clipped) {
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
 
   MediaObserver* const media_observer =
       GetContentClient()->browser()->GetMediaObserver();
   if (media_observer) {
-    DVLOG(1) << "AudioRendererHost@" << this
-             << "::DoNotifyAudibleState(is_audible=" << is_audible
-             << ") for stream_id=" << entry->stream_id();
+#ifndef NDEBUG

[DaleCurtis, 2013/07/02 22:26:34]

As nice as it looks, you should probably remove prior to commit.

[miu, 2013/07/09 00:59:56]

Done.

+    // Convenient debug tool: A simple text-mode power meter.
+    if (VLOG_IS_ON(2)) {
+      static const int kNumBars = 24;
+      static const float kBottomThreshold = -72.0f;
+      const float capped_power =
+          std::max(kBottomThreshold, std::min(0.0f, power_dBFS));
+      const int bars_lit = static_cast<int>(
+          kNumBars * (1.0f - (capped_power / kBottomThreshold)));
+      DVLOG(2) << "AudioRendererHost@" << this
+               << "::DoNotifyAudioPowerLevel("
+               << std::string(bars_lit, '#')
+               << std::string(kNumBars - bars_lit, '_')
+               << (clipped ? "!!!  " : "  ")
+               << static_cast<int>(power_dBFS) << " dBFS"
+               << ") for stream_id=" << entry->stream_id();
+    }
+#endif
 
     if (CommandLine::ForCurrentProcess()->HasSwitch(
             switches::kEnableAudibleNotifications)) {
       media_observer->OnAudioStreamPlayingChanged(
           render_process_id_, entry->render_view_id(), entry->stream_id(),
-          is_audible);
+          true, power_dBFS, clipped);
     }
   }
 }
 
 ///////////////////////////////////////////////////////////////////////////////
 // IPC Messages handler
 bool AudioRendererHost::OnMessageReceived(const IPC::Message& message,
                                           bool* message_was_ok) {
   bool handled = true;
   IPC_BEGIN_MESSAGE_MAP_EX(AudioRendererHost, message, *message_was_ok)
@@ skipping 156 matching lines @@
 }
 
 void AudioRendererHost::DeleteEntry(scoped_ptr<AudioEntry> entry) {
   DCHECK(BrowserThread::CurrentlyOn(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->OnAudioStreamPlayingChanged(
-        render_process_id_, entry->render_view_id(), entry->stream_id(), false);
+        render_process_id_, entry->render_view_id(), entry->stream_id(),
+        false, -std::numeric_limits<float>::infinity(), false);
   }
 
   // Notify the media observer.
   if (media_internals_)
     media_internals_->OnDeleteAudioStream(this, entry->stream_id());
 
   // Note: |entry| will be deleted upon leaving this scope.
 }
 
 void AudioRendererHost::ReportErrorAndClose(int stream_id) {
@@ skipping 14 matching lines @@
 }
 
 AudioRendererHost::AudioEntry* AudioRendererHost::LookupById(int stream_id) {
   DCHECK(BrowserThread::CurrentlyOn(BrowserThread::IO));
 
   AudioEntryMap::const_iterator i = audio_entries_.find(stream_id);
   return i != audio_entries_.end() ? i->second : NULL;
 }
 
 }  // namespace content