Added a level indicator to new mixer.

webrtc/modules/audio_mixer/new_audio_conference_mixer_impl.h

Index: webrtc/modules/audio_mixer/new_audio_conference_mixer_impl.h
diff --git a/webrtc/modules/audio_mixer/new_audio_conference_mixer_impl.h b/webrtc/modules/audio_mixer/new_audio_conference_mixer_impl.h
index 3933350fed0a593af4425d1b898e32765753bb74..e3075892f9a8f81822a8447d9e2b397adfde9632 100644
--- a/webrtc/modules/audio_mixer/new_audio_conference_mixer_impl.h
+++ b/webrtc/modules/audio_mixer/new_audio_conference_mixer_impl.h
@@ -20,6 +20,7 @@
 #include "webrtc/engine_configurations.h"
 #include "webrtc/modules/audio_mixer/new_audio_conference_mixer.h"
 #include "webrtc/modules/include/module_common_types.h"
+#include "webrtc/voice_engine/level_indicator.h"
 
 namespace webrtc {
 class AudioProcessing;
@@ -125,6 +126,11 @@ class NewAudioConferenceMixerImpl : public NewAudioConferenceMixer {
 
   bool LimitMixedAudio(AudioFrame* mixedAudio) const;
 
+  // Output level functions from VoEVolumeControl

[minyue-webrtc, 2016/08/11 10:27:33]

comment is a bit misleading, revise the wording.

And add a full stop to sentence.

[aleloi, 2016/08/11 12:15:19]

Done.

+  uint32_t GetSpeechOutputLevel() override;

[minyue-webrtc, 2016/08/11 10:27:33]

why does this have to be "speech"?

[aleloi, 2016/08/11 12:15:19]

Historical reasons, I'd say. The function name in VoEVolumeControl is
GetSpeechOutputLevel
https://cs.chromium.org/chromium/src/third_party/webrtc/voice_engine/include/...

I'll call it GetAudioOutputLevel instead, since that's what it is.

+
+  uint32_t GetSpeechOutputLevelFullRange() override;
+
   std::unique_ptr<CriticalSectionWrapper> crit_;
   std::unique_ptr<CriticalSectionWrapper> cb_crit_;
 
@@ -152,6 +158,9 @@ class NewAudioConferenceMixerImpl : public NewAudioConferenceMixer {
 
   // Used for inhibiting saturation in mixing.
   std::unique_ptr<AudioProcessing> limiter_;
+
+  // measures audio level for the combined signal
+  voe::AudioLevel audio_level_;

[aleloi, 2016/08/11 12:15:19]

Will add capitalization and sentence break (sorry, missed).

 };
 }  // namespace webrtc