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/source/audio_conference_mixer_impl.h

Index: webrtc/modules/audio_mixer/source/audio_conference_mixer_impl.h
diff --git a/webrtc/modules/audio_mixer/source/audio_conference_mixer_impl.h b/webrtc/modules/audio_mixer/source/audio_conference_mixer_impl.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_CONFERENCE_MIXER_SOURCE_AUDIO_CONFERENCE_MIXER_IMPL_H_
+#define WEBRTC_MODULES_AUDIO_CONFERENCE_MIXER_SOURCE_AUDIO_CONFERENCE_MIXER_IMPL_H_
+
+#include <list>
+#include <map>
+#include <memory>
+
+#include "webrtc/engine_configurations.h"
+#include "webrtc/modules/audio_conference_mixer/include/audio_conference_mixer.h"
+#include "webrtc/modules/audio_conference_mixer/source/memory_pool.h"
+#include "webrtc/modules/audio_conference_mixer/source/time_scheduler.h"
+#include "webrtc/modules/include/module_common_types.h"
+
+namespace webrtc {
+class AudioProcessing;
+class CriticalSectionWrapper;
+
+struct FrameAndMuteInfo {
+  FrameAndMuteInfo(AudioFrame* f, bool m) : frame(f), muted(m) {}
+  AudioFrame* frame;
+  bool muted;
+};
+
+typedef std::list<FrameAndMuteInfo> AudioFrameList;
+typedef std::list<MixerParticipant*> MixerParticipantList;
+
+// Cheshire cat implementation of MixerParticipant's non virtual functions.
+class MixHistory {
+ public:
+  MixHistory();
+  ~MixHistory();
+
+  // Returns true if the participant is being mixed.
+  bool IsMixed() const;
+
+  // Returns true if the participant was mixed previous mix
+  // iteration.
+  bool WasMixed() const;
+
+  // Updates the mixed status.
+  int32_t SetIsMixed(bool mixed);
+
+  void ResetMixedStatus();
+
+ private:
+  bool _isMixed;
+};
+
+class AudioConferenceMixerImpl : public AudioConferenceMixer {
+ public:
+  // AudioProcessing only accepts 10 ms frames.
+  enum { kProcessPeriodicityInMs = 10 };
+
+  AudioConferenceMixerImpl(int id);
+  ~AudioConferenceMixerImpl();
+
+  // Must be called after ctor.
+  bool Init();
+
+  // Module functions
+  int64_t TimeUntilNextProcess() override;
+  void Process() override;
+
+  // AudioConferenceMixer functions
+  int32_t RegisterMixedStreamCallback(
+      AudioMixerOutputReceiver* mixReceiver) override;
+  int32_t UnRegisterMixedStreamCallback() override;
+  int32_t SetMixabilityStatus(MixerParticipant* participant,
+                              bool mixable) override;
+  bool MixabilityStatus(const MixerParticipant& participant) const override;
+  int32_t SetMinimumMixingFrequency(Frequency freq) override;
+  int32_t SetAnonymousMixabilityStatus(MixerParticipant* participant,
+                                       bool mixable) override;
+  bool AnonymousMixabilityStatus(
+      const MixerParticipant& participant) const override;
+
+ private:
+  enum { DEFAULT_AUDIO_FRAME_POOLSIZE = 50 };
+
+  // Set/get mix frequency
+  int32_t SetOutputFrequency(const Frequency& frequency);
+  Frequency OutputFrequency() const;
+
+  // Fills mixList with the AudioFrames pointers that should be used when
+  // mixing.
+  // maxAudioFrameCounter both input and output specifies how many more
+  // AudioFrames that are allowed to be mixed.
+  // rampOutList contain AudioFrames corresponding to an audio stream that
+  // used to be mixed but shouldn't be mixed any longer. These AudioFrames
+  // should be ramped out over this AudioFrame to avoid audio discontinuities.
+  void UpdateToMix(AudioFrameList* mixList,
+                   AudioFrameList* rampOutList,
+                   std::map<int, MixerParticipant*>* mixParticipantList,
+                   size_t* maxAudioFrameCounter) const;
+
+  // Return the lowest mixing frequency that can be used without having to
+  // downsample any audio.
+  int32_t GetLowestMixingFrequency() const;
+  int32_t GetLowestMixingFrequencyFromList(
+      const MixerParticipantList& mixList) const;
+
+  // Return the AudioFrames that should be mixed anonymously.
+  void GetAdditionalAudio(AudioFrameList* additionalFramesList) const;
+
+  // Update the MixHistory of all MixerParticipants. mixedParticipantsList
+  // should contain a map of MixerParticipants that have been mixed.
+  void UpdateMixedStatus(
+      const std::map<int, MixerParticipant*>& mixedParticipantsList) const;
+
+  // Clears audioFrameList and reclaims all memory associated with it.
+  void ClearAudioFrameList(AudioFrameList* audioFrameList) const;
+
+  // This function returns true if it finds the MixerParticipant in the
+  // specified list of MixerParticipants.
+  bool IsParticipantInList(const MixerParticipant& participant,
+                           const MixerParticipantList& participantList) const;
+
+  // Add/remove the MixerParticipant to the specified
+  // MixerParticipant list.
+  bool AddParticipantToList(MixerParticipant* participant,
+                            MixerParticipantList* participantList) const;
+  bool RemoveParticipantFromList(MixerParticipant* removeParticipant,
+                                 MixerParticipantList* participantList) const;
+
+  // Mix the AudioFrames stored in audioFrameList into mixedAudio.
+  int32_t MixFromList(AudioFrame* mixedAudio,
+                      const AudioFrameList& audioFrameList) const;
+
+  // Mix the AudioFrames stored in audioFrameList into mixedAudio. No
+  // record will be kept of this mix (e.g. the corresponding MixerParticipants
+  // will not be marked as IsMixed()
+  int32_t MixAnonomouslyFromList(AudioFrame* mixedAudio,
+                                 const AudioFrameList& audioFrameList) const;
+
+  bool LimitMixedAudio(AudioFrame* mixedAudio) const;
+
+  std::unique_ptr<CriticalSectionWrapper> _crit;
+  std::unique_ptr<CriticalSectionWrapper> _cbCrit;
+
+  int32_t _id;
+
+  Frequency _minimumMixingFreq;
+
+  // Mix result callback
+  AudioMixerOutputReceiver* _mixReceiver;
+
+  // The current sample frequency and sample size when mixing.
+  Frequency _outputFrequency;
+  size_t _sampleSize;
+
+  // Memory pool to avoid allocating/deallocating AudioFrames
+  MemoryPool<AudioFrame>* _audioFramePool;
+
+  // List of all participants. Note all lists are disjunct
+  MixerParticipantList _participantList;  // May be mixed.
+  // Always mixed, anonomously.
+  MixerParticipantList _additionalParticipantList;
+
+  size_t _numMixedParticipants;
+  // Determines if we will use a limiter for clipping protection during
+  // mixing.
+  bool use_limiter_;
+
+  uint32_t _timeStamp;
+
+  // Metronome class.
+  TimeScheduler _timeScheduler;
+
+  // Counter keeping track of concurrent calls to process.
+  // Note: should never be higher than 1 or lower than 0.
+  int16_t _processCalls;
+
+  // Used for inhibiting saturation in mixing.
+  std::unique_ptr<AudioProcessing> _limiter;
+};
+}  // namespace webrtc
+
+#endif  // WEBRTC_MODULES_AUDIO_CONFERENCE_MIXER_SOURCE_AUDIO_CONFERENCE_MIXER_IMPL_H_