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.cc

Index: webrtc/modules/audio_mixer/audio_mixer.cc
diff --git a/webrtc/modules/audio_mixer/audio_mixer.cc b/webrtc/modules/audio_mixer/audio_mixer.cc
new file mode 100644
index 0000000000000000000000000000000000000000..cef29bfcdc04df91314287cc93d0731a4f84bdb5
--- /dev/null
+++ b/webrtc/modules/audio_mixer/audio_mixer.cc
@@ -0,0 +1,450 @@
+/*
+ *  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.
+ */
+
+#include "webrtc/modules/audio_mixer/audio_mixer.h"
+
+#include "webrtc/base/format_macros.h"
+#include "webrtc/modules/audio_processing/include/audio_processing.h"
+#include "webrtc/modules/utility/include/audio_frame_operations.h"
+#include "webrtc/system_wrappers/include/file_wrapper.h"
+#include "webrtc/system_wrappers/include/trace.h"
+#include "webrtc/voice_engine/include/voe_external_media.h"
+#include "webrtc/voice_engine/statistics.h"
+#include "webrtc/voice_engine/utility.h"
+
+namespace webrtc {
+namespace voe {
+
+void AudioMixer::NewMixedAudio(int32_t id,
+                               const AudioFrame& generalAudioFrame,
+                               const AudioFrame** uniqueAudioFrames,
+                               uint32_t size) {
+  WEBRTC_TRACE(kTraceStream, kTraceVoice, VoEId(_instanceId, -1),
+               "AudioMixer::NewMixedAudio(id=%d, size=%u)", id, size);
+
+  _audioFrame.CopyFrom(generalAudioFrame);
+  _audioFrame.id_ = id;
+}
+
+void AudioMixer::PlayNotification(int32_t id, uint32_t durationMs) {
+  WEBRTC_TRACE(kTraceStream, kTraceVoice, VoEId(_instanceId, -1),
+               "AudioMixer::PlayNotification(id=%d, durationMs=%d)", id,
+               durationMs);
+  // Not implement yet
+}
+
+void AudioMixer::RecordNotification(int32_t id, uint32_t durationMs) {
+  WEBRTC_TRACE(kTraceStream, kTraceVoice, VoEId(_instanceId, -1),
+               "AudioMixer::RecordNotification(id=%d, durationMs=%d)", id,
+               durationMs);
+
+  // Not implement yet
+}
+
+void AudioMixer::PlayFileEnded(int32_t id) {
+  WEBRTC_TRACE(kTraceStream, kTraceVoice, VoEId(_instanceId, -1),
+               "AudioMixer::PlayFileEnded(id=%d)", id);
+
+  // not needed
+}
+
+void AudioMixer::RecordFileEnded(int32_t id) {
+  WEBRTC_TRACE(kTraceStream, kTraceVoice, VoEId(_instanceId, -1),
+               "AudioMixer::RecordFileEnded(id=%d)", id);
+  assert(id == _instanceId);
+
+  rtc::CritScope cs(&_fileCritSect);
+  _outputFileRecording = false;
+  WEBRTC_TRACE(kTraceStateInfo, kTraceVoice, VoEId(_instanceId, -1),
+               "AudioMixer::RecordFileEnded() =>"
+               "output file recorder module is shutdown");
+}
+
+int32_t AudioMixer::Create(AudioMixer*& mixer, uint32_t instanceId) {
+  WEBRTC_TRACE(kTraceMemory, kTraceVoice, instanceId,
+               "AudioMixer::Create(instanceId=%d)", instanceId);
+  mixer = new AudioMixer(instanceId);
+  if (mixer == NULL) {
+    WEBRTC_TRACE(kTraceMemory, kTraceVoice, instanceId,
+                 "AudioMixer::Create() unable to allocate memory for"
+                 "mixer");
+    return -1;
+  }
+  return 0;
+}
+
+AudioMixer::AudioMixer(uint32_t instanceId)
+    : _mixerModule(*NewAudioConferenceMixer::Create(instanceId)),
+      _audioLevel(),
+      _instanceId(instanceId),
+      _externalMediaCallbackPtr(NULL),
+      _externalMedia(false),
+      _panLeft(1.0f),
+      _panRight(1.0f),
+      _mixingFrequencyHz(8000),
+      _outputFileRecorderPtr(NULL),
+      _outputFileRecording(false) {
+  WEBRTC_TRACE(kTraceMemory, kTraceVoice, VoEId(_instanceId, -1),
+               "AudioMixer::AudioMixer() - ctor");
+
+  if (_mixerModule.RegisterMixedStreamCallback(this) == -1) {
+    WEBRTC_TRACE(kTraceError, kTraceVoice, VoEId(_instanceId, -1),
+                 "AudioMixer::AudioMixer() failed to register mixer"
+                 "callbacks");
+  }
+}
+
+void AudioMixer::Destroy(AudioMixer*& mixer) {
+  if (mixer) {
+    delete mixer;
+    mixer = NULL;
+  }
+}
+
+AudioMixer::~AudioMixer() {
+  WEBRTC_TRACE(kTraceMemory, kTraceVoice, VoEId(_instanceId, -1),
+               "AudioMixer::~AudioMixer() - dtor");
+  if (_externalMedia) {
+    DeRegisterExternalMediaProcessing();
+  }
+  {
+    rtc::CritScope cs(&_fileCritSect);
+    if (_outputFileRecorderPtr) {
+      _outputFileRecorderPtr->RegisterModuleFileCallback(NULL);
+      _outputFileRecorderPtr->StopRecording();
+      FileRecorder::DestroyFileRecorder(_outputFileRecorderPtr);
+      _outputFileRecorderPtr = NULL;
+    }
+  }
+  _mixerModule.UnRegisterMixedStreamCallback();
+  delete &_mixerModule;
+}
+
+int32_t AudioMixer::SetEngineInformation(voe::Statistics& engineStatistics) {
+  WEBRTC_TRACE(kTraceInfo, kTraceVoice, VoEId(_instanceId, -1),
+               "AudioMixer::SetEngineInformation()");
+  _engineStatisticsPtr = &engineStatistics;
+  return 0;
+}
+
+int32_t AudioMixer::SetAudioProcessingModule(
+    AudioProcessing* audioProcessingModule) {
+  WEBRTC_TRACE(kTraceInfo, kTraceVoice, VoEId(_instanceId, -1),
+               "AudioMixer::SetAudioProcessingModule("
+               "audioProcessingModule=0x%x)",
+               audioProcessingModule);
+  _audioProcessingModulePtr = audioProcessingModule;
+  return 0;
+}
+
+int AudioMixer::RegisterExternalMediaProcessing(
+    VoEMediaProcess& proccess_object) {
+  WEBRTC_TRACE(kTraceInfo, kTraceVoice, VoEId(_instanceId, -1),
+               "AudioMixer::RegisterExternalMediaProcessing()");
+
+  rtc::CritScope cs(&_callbackCritSect);
+  _externalMediaCallbackPtr = &proccess_object;
+  _externalMedia = true;
+
+  return 0;
+}
+
+int AudioMixer::DeRegisterExternalMediaProcessing() {
+  WEBRTC_TRACE(kTraceInfo, kTraceVoice, VoEId(_instanceId, -1),
+               "AudioMixer::DeRegisterExternalMediaProcessing()");
+
+  rtc::CritScope cs(&_callbackCritSect);
+  _externalMedia = false;
+  _externalMediaCallbackPtr = NULL;
+
+  return 0;
+}
+
+int32_t AudioMixer::SetMixabilityStatus(MixerAudioSource& participant,
+                                        bool mixable) {
+  return _mixerModule.SetMixabilityStatus(&participant, mixable);
+}
+
+int32_t AudioMixer::SetAnonymousMixabilityStatus(MixerAudioSource& participant,
+                                                 bool mixable) {
+  return _mixerModule.SetAnonymousMixabilityStatus(&participant, mixable);
+}
+
+int32_t AudioMixer::MixActiveChannels() {
+  _mixerModule.Process();
+  return 0;
+}
+
+int AudioMixer::GetSpeechOutputLevel(uint32_t& level) {
+  int8_t currentLevel = _audioLevel.Level();
+  level = static_cast<uint32_t>(currentLevel);
+  WEBRTC_TRACE(kTraceStateInfo, kTraceVoice, VoEId(_instanceId, -1),
+               "GetSpeechOutputLevel() => level=%u", level);
+  return 0;
+}
+
+int AudioMixer::GetSpeechOutputLevelFullRange(uint32_t& level) {
+  int16_t currentLevel = _audioLevel.LevelFullRange();
+  level = static_cast<uint32_t>(currentLevel);
+  WEBRTC_TRACE(kTraceStateInfo, kTraceVoice, VoEId(_instanceId, -1),
+               "GetSpeechOutputLevelFullRange() => level=%u", level);
+  return 0;
+}
+
+int AudioMixer::SetOutputVolumePan(float left, float right) {
+  WEBRTC_TRACE(kTraceInfo, kTraceVoice, VoEId(_instanceId, -1),
+               "AudioMixer::SetOutputVolumePan()");
+  _panLeft = left;
+  _panRight = right;
+  return 0;
+}
+
+int AudioMixer::GetOutputVolumePan(float& left, float& right) {
+  left = _panLeft;
+  right = _panRight;
+  WEBRTC_TRACE(kTraceStateInfo, kTraceVoice, VoEId(_instanceId, -1),
+               "GetOutputVolumePan() => left=%2.1f, right=%2.1f", left, right);
+  return 0;
+}
+
+int AudioMixer::StartRecordingPlayout(const char* fileName,
+                                      const CodecInst* codecInst) {
+  WEBRTC_TRACE(kTraceInfo, kTraceVoice, VoEId(_instanceId, -1),
+               "AudioMixer::StartRecordingPlayout(fileName=%s)", fileName);
+
+  if (_outputFileRecording) {
+    WEBRTC_TRACE(kTraceWarning, kTraceVoice, VoEId(_instanceId, -1),
+                 "StartRecordingPlayout() is already recording");
+    return 0;
+  }
+
+  FileFormats format;
+  const uint32_t notificationTime(0);
+  CodecInst dummyCodec = {100, "L16", 16000, 320, 1, 320000};
+
+  if ((codecInst != NULL) &&
+      ((codecInst->channels < 1) || (codecInst->channels > 2))) {
+    _engineStatisticsPtr->SetLastError(
+        VE_BAD_ARGUMENT, kTraceError,
+        "StartRecordingPlayout() invalid compression");
+    return (-1);
+  }
+  if (codecInst == NULL) {
+    format = kFileFormatPcm16kHzFile;
+    codecInst = &dummyCodec;
+  } else if ((STR_CASE_CMP(codecInst->plname, "L16") == 0) ||
+             (STR_CASE_CMP(codecInst->plname, "PCMU") == 0) ||
+             (STR_CASE_CMP(codecInst->plname, "PCMA") == 0)) {
+    format = kFileFormatWavFile;
+  } else {
+    format = kFileFormatCompressedFile;
+  }
+
+  rtc::CritScope cs(&_fileCritSect);
+
+  // Destroy the old instance
+  if (_outputFileRecorderPtr) {
+    _outputFileRecorderPtr->RegisterModuleFileCallback(NULL);
+    FileRecorder::DestroyFileRecorder(_outputFileRecorderPtr);
+    _outputFileRecorderPtr = NULL;
+  }
+
+  _outputFileRecorderPtr =
+      FileRecorder::CreateFileRecorder(_instanceId, (const FileFormats)format);
+  if (_outputFileRecorderPtr == NULL) {
+    _engineStatisticsPtr->SetLastError(
+        VE_INVALID_ARGUMENT, kTraceError,
+        "StartRecordingPlayout() fileRecorder format isnot correct");
+    return -1;
+  }
+
+  if (_outputFileRecorderPtr->StartRecordingAudioFile(
+          fileName, (const CodecInst&)*codecInst, notificationTime) != 0) {
+    _engineStatisticsPtr->SetLastError(
+        VE_BAD_FILE, kTraceError,
+        "StartRecordingAudioFile() failed to start file recording");
+    _outputFileRecorderPtr->StopRecording();
+    FileRecorder::DestroyFileRecorder(_outputFileRecorderPtr);
+    _outputFileRecorderPtr = NULL;
+    return -1;
+  }
+  _outputFileRecorderPtr->RegisterModuleFileCallback(this);
+  _outputFileRecording = true;
+
+  return 0;
+}
+
+int AudioMixer::StartRecordingPlayout(OutStream* stream,
+                                      const CodecInst* codecInst) {
+  WEBRTC_TRACE(kTraceInfo, kTraceVoice, VoEId(_instanceId, -1),
+               "AudioMixer::StartRecordingPlayout()");
+
+  if (_outputFileRecording) {
+    WEBRTC_TRACE(kTraceWarning, kTraceVoice, VoEId(_instanceId, -1),
+                 "StartRecordingPlayout() is already recording");
+    return 0;
+  }
+
+  FileFormats format;
+  const uint32_t notificationTime(0);
+  CodecInst dummyCodec = {100, "L16", 16000, 320, 1, 320000};
+
+  if (codecInst != NULL && codecInst->channels != 1) {
+    _engineStatisticsPtr->SetLastError(
+        VE_BAD_ARGUMENT, kTraceError,
+        "StartRecordingPlayout() invalid compression");
+    return (-1);
+  }
+  if (codecInst == NULL) {
+    format = kFileFormatPcm16kHzFile;
+    codecInst = &dummyCodec;
+  } else if ((STR_CASE_CMP(codecInst->plname, "L16") == 0) ||
+             (STR_CASE_CMP(codecInst->plname, "PCMU") == 0) ||
+             (STR_CASE_CMP(codecInst->plname, "PCMA") == 0)) {
+    format = kFileFormatWavFile;
+  } else {
+    format = kFileFormatCompressedFile;
+  }
+
+  rtc::CritScope cs(&_fileCritSect);
+
+  // Destroy the old instance
+  if (_outputFileRecorderPtr) {
+    _outputFileRecorderPtr->RegisterModuleFileCallback(NULL);
+    FileRecorder::DestroyFileRecorder(_outputFileRecorderPtr);
+    _outputFileRecorderPtr = NULL;
+  }
+
+  _outputFileRecorderPtr =
+      FileRecorder::CreateFileRecorder(_instanceId, (const FileFormats)format);
+  if (_outputFileRecorderPtr == NULL) {
+    _engineStatisticsPtr->SetLastError(
+        VE_INVALID_ARGUMENT, kTraceError,
+        "StartRecordingPlayout() fileRecorder format isnot correct");
+    return -1;
+  }
+
+  if (_outputFileRecorderPtr->StartRecordingAudioFile(*stream, *codecInst,
+                                                      notificationTime) != 0) {
+    _engineStatisticsPtr->SetLastError(
+        VE_BAD_FILE, kTraceError,
+        "StartRecordingAudioFile() failed to start file recording");
+    _outputFileRecorderPtr->StopRecording();
+    FileRecorder::DestroyFileRecorder(_outputFileRecorderPtr);
+    _outputFileRecorderPtr = NULL;
+    return -1;
+  }
+
+  _outputFileRecorderPtr->RegisterModuleFileCallback(this);
+  _outputFileRecording = true;
+
+  return 0;
+}
+
+int AudioMixer::StopRecordingPlayout() {
+  WEBRTC_TRACE(kTraceInfo, kTraceVoice, VoEId(_instanceId, -1),
+               "AudioMixer::StopRecordingPlayout()");
+
+  if (!_outputFileRecording) {
+    WEBRTC_TRACE(kTraceError, kTraceVoice, VoEId(_instanceId, -1),
+                 "StopRecordingPlayout() file isnot recording");
+    return -1;
+  }
+
+  rtc::CritScope cs(&_fileCritSect);
+
+  if (_outputFileRecorderPtr->StopRecording() != 0) {
+    _engineStatisticsPtr->SetLastError(
+        VE_STOP_RECORDING_FAILED, kTraceError,
+        "StopRecording(), could not stop recording");
+    return -1;
+  }
+  _outputFileRecorderPtr->RegisterModuleFileCallback(NULL);
+  FileRecorder::DestroyFileRecorder(_outputFileRecorderPtr);
+  _outputFileRecorderPtr = NULL;
+  _outputFileRecording = false;
+
+  return 0;
+}
+
+int AudioMixer::GetMixedAudio(int sample_rate_hz,
+                              size_t num_channels,
+                              AudioFrame* frame) {
+  WEBRTC_TRACE(
+      kTraceStream, kTraceVoice, VoEId(_instanceId, -1),
+      "AudioMixer::GetMixedAudio(sample_rate_hz=%d, num_channels=%" PRIuS ")",
+      sample_rate_hz, num_channels);
+
+  // --- Record playout if enabled
+  {
+    rtc::CritScope cs(&_fileCritSect);
+    if (_outputFileRecording && _outputFileRecorderPtr)
+      _outputFileRecorderPtr->RecordAudioToFile(_audioFrame);
+  }
+
+  frame->num_channels_ = num_channels;
+  frame->sample_rate_hz_ = sample_rate_hz;
+  // TODO(andrew): Ideally the downmixing would occur much earlier, in
+  // AudioCodingModule.
+  RemixAndResample(_audioFrame, &resampler_, frame);
+  return 0;
+}
+
+int32_t AudioMixer::DoOperationsOnCombinedSignal(bool feed_data_to_apm) {
+  if (_audioFrame.sample_rate_hz_ != _mixingFrequencyHz) {
+    WEBRTC_TRACE(kTraceStream, kTraceVoice, VoEId(_instanceId, -1),
+                 "AudioMixer::DoOperationsOnCombinedSignal() => "
+                 "mixing frequency = %d",
+                 _audioFrame.sample_rate_hz_);
+    _mixingFrequencyHz = _audioFrame.sample_rate_hz_;
+  }
+
+  // Scale left and/or right channel(s) if balance is active
+  if (_panLeft != 1.0 || _panRight != 1.0) {
+    if (_audioFrame.num_channels_ == 1) {
+      AudioFrameOperations::MonoToStereo(&_audioFrame);
+    } else {
+      // Pure stereo mode (we are receiving a stereo signal).
+    }
+
+    assert(_audioFrame.num_channels_ == 2);
+    AudioFrameOperations::Scale(_panLeft, _panRight, _audioFrame);
+  }
+
+  // --- Far-end Voice Quality Enhancement (AudioProcessing Module)
+  if (feed_data_to_apm) {
+    if (_audioProcessingModulePtr->ProcessReverseStream(&_audioFrame) != 0) {
+      WEBRTC_TRACE(kTraceWarning, kTraceVoice, VoEId(_instanceId, -1),
+                   "AudioProcessingModule::ProcessReverseStream() => error");
+      RTC_DCHECK(false);
+    }
+  }
+
+  // --- External media processing
+  {
+    rtc::CritScope cs(&_callbackCritSect);
+    if (_externalMedia) {
+      const bool is_stereo = (_audioFrame.num_channels_ == 2);
+      if (_externalMediaCallbackPtr) {
+        _externalMediaCallbackPtr->Process(
+            -1, kPlaybackAllChannelsMixed, (int16_t*)_audioFrame.data_,
+            _audioFrame.samples_per_channel_, _audioFrame.sample_rate_hz_,
+            is_stereo);
+      }
+    }
+  }
+
+  // --- Measure audio level (0-9) for the combined signal
+  _audioLevel.ComputeLevel(_audioFrame);
+
+  return 0;
+}
+}  // namespace voe
+}  // namespace webrtc