A simple copy of the old mixer to a new directory. I also plan to run 'git cl format'. In another C…

webrtc/modules/audio_mixer/audio_mixer.h

Index: webrtc/modules/audio_mixer/audio_mixer.h
diff --git a/webrtc/modules/audio_mixer/audio_mixer.h b/webrtc/modules/audio_mixer/audio_mixer.h
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+/*
+ *  Copyright (c) 2012 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+#ifndef WEBRTC_MODULES_AUDIO_MIXER_AUDIO_MIXER_H_
+#define WEBRTC_MODULES_AUDIO_MIXER_AUDIO_MIXER_H_
+
+#include "webrtc/base/criticalsection.h"
+#include "webrtc/common_audio/resampler/include/push_resampler.h"
+#include "webrtc/common_types.h"
+#include "webrtc/modules/audio_mixer/include/new_audio_conference_mixer.h"
+#include "webrtc/modules/audio_mixer/include/audio_mixer_defines.h"
+#include "webrtc/modules/utility/include/file_recorder.h"
+#include "webrtc/voice_engine/level_indicator.h"
+#include "webrtc/voice_engine/voice_engine_defines.h"
+
+namespace webrtc {
+
+class AudioProcessing;
+class FileWrapper;
+class VoEMediaProcess;
+
+namespace voe {
+class Statistics;
+
+// Note: this class is in the process of being rewritten and merged
+// with AudioConferenceMixer. Expect inheritance chains to be changed,
+// member functions removed or renamed.
+class AudioMixer : public OldAudioMixerOutputReceiver, public FileCallback {
+ public:
+  static int32_t Create(AudioMixer*& mixer, uint32_t instanceId);  // NOLINT
+
+  static void Destroy(AudioMixer*& mixer);  // NOLINT
+
+  int32_t SetEngineInformation(Statistics& engineStatistics);  // NOLINT
+
+  int32_t SetAudioProcessingModule(AudioProcessing* audioProcessingModule);
+
+  // VoEExternalMedia
+  int RegisterExternalMediaProcessing(VoEMediaProcess&  // NOLINT
+                                      proccess_object);
+
+  int DeRegisterExternalMediaProcessing();
+
+  int32_t MixActiveChannels();
+
+  int32_t DoOperationsOnCombinedSignal(bool feed_data_to_apm);
+
+  int32_t SetMixabilityStatus(MixerAudioSource& participant,  // NOLINT
+                              bool mixable);
+
+  int32_t SetAnonymousMixabilityStatus(MixerAudioSource& participant,  // NOLINT
+                                       bool mixable);
+
+  int GetMixedAudio(int sample_rate_hz,
+                    size_t num_channels,
+                    AudioFrame* audioFrame);
+
+  // VoEVolumeControl
+  int GetSpeechOutputLevel(uint32_t& level);  // NOLINT
+
+  int GetSpeechOutputLevelFullRange(uint32_t& level);  // NOLINT
+
+  int SetOutputVolumePan(float left, float right);
+
+  int GetOutputVolumePan(float& left, float& right);  // NOLINT
+
+  // VoEFile
+  int StartRecordingPlayout(const char* fileName, const CodecInst* codecInst);
+
+  int StartRecordingPlayout(OutStream* stream, const CodecInst* codecInst);
+  int StopRecordingPlayout();
+
+  virtual ~AudioMixer();
+
+  // from AudioMixerOutputReceiver
+  virtual void NewMixedAudio(int32_t id,
+                             const AudioFrame& generalAudioFrame,
+                             const AudioFrame** uniqueAudioFrames,
+                             uint32_t size);
+
+  // For file recording
+  void PlayNotification(int32_t id, uint32_t durationMs);
+
+  void RecordNotification(int32_t id, uint32_t durationMs);
+
+  void PlayFileEnded(int32_t id);
+  void RecordFileEnded(int32_t id);
+
+ private:
+  explicit AudioMixer(uint32_t instanceId);
+
+  // uses
+  Statistics* _engineStatisticsPtr;
+  AudioProcessing* _audioProcessingModulePtr;
+
+  rtc::CriticalSection _callbackCritSect;
+  // protect the _outputFileRecorderPtr and _outputFileRecording
+  rtc::CriticalSection _fileCritSect;
+  NewAudioConferenceMixer& _mixerModule;
+  AudioFrame _audioFrame;
+  // Converts mixed audio to the audio device output rate.
+  PushResampler<int16_t> resampler_;
+  // Converts mixed audio to the audio processing rate.
+  PushResampler<int16_t> audioproc_resampler_;
+  AudioLevel _audioLevel;  // measures audio level for the combined signal
+  int _instanceId;
+  VoEMediaProcess* _externalMediaCallbackPtr;
+  bool _externalMedia;
+  float _panLeft;
+  float _panRight;
+  int _mixingFrequencyHz;
+  FileRecorder* _outputFileRecorderPtr;
+  bool _outputFileRecording;
+};
+
+}  // namespace voe
+
+}  // namespace webrtc
+
+#endif  // WEBRTC_MODULES_AUDIO_MIXER_AUDIO_MIXER_H_