Re-land "Add a media constraint to enable beamforming"

content/renderer/media/media_stream_audio_processor_options.cc

 // Copyright 2013 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/renderer/media/media_stream_audio_processor_options.h"
 
 #include "base/files/file_path.h"
 #include "base/files/file_util.h"
 #include "base/logging.h"
 #include "base/metrics/field_trial.h"
@@ skipping 17 matching lines @@
 const char MediaAudioConstraints::kGoogExperimentalEchoCancellation[] =
     "googEchoCancellation2";
 const char MediaAudioConstraints::kGoogAutoGainControl[] =
     "googAutoGainControl";
 const char MediaAudioConstraints::kGoogExperimentalAutoGainControl[] =
     "googAutoGainControl2";
 const char MediaAudioConstraints::kGoogNoiseSuppression[] =
     "googNoiseSuppression";
 const char MediaAudioConstraints::kGoogExperimentalNoiseSuppression[] =
     "googNoiseSuppression2";
+const char MediaAudioConstraints::kGoogBeamforming[] = "googBeamforming";
 const char MediaAudioConstraints::kGoogHighpassFilter[] = "googHighpassFilter";
 const char MediaAudioConstraints::kGoogTypingNoiseDetection[] =
     "googTypingNoiseDetection";
 const char MediaAudioConstraints::kGoogAudioMirroring[] = "googAudioMirroring";
 
 namespace {
 
 // Constant constraint keys which enables default audio constraints on
 // mediastreams with audio.
 struct {
   const char* key;
   bool value;
 } const kDefaultAudioConstraints[] = {
   { MediaAudioConstraints::kEchoCancellation, true },
   { MediaAudioConstraints::kGoogEchoCancellation, true },
 #if defined(OS_ANDROID) || defined(OS_IOS)
   { MediaAudioConstraints::kGoogExperimentalEchoCancellation, false },
 #else
   // Enable the extended filter mode AEC on all non-mobile platforms.
   { MediaAudioConstraints::kGoogExperimentalEchoCancellation, true },
 #endif
   { MediaAudioConstraints::kGoogAutoGainControl, true },
   { MediaAudioConstraints::kGoogExperimentalAutoGainControl, true },
   { MediaAudioConstraints::kGoogNoiseSuppression, true },
   { MediaAudioConstraints::kGoogHighpassFilter, true },
   { MediaAudioConstraints::kGoogTypingNoiseDetection, true },
   { MediaAudioConstraints::kGoogExperimentalNoiseSuppression, false },
+  { MediaAudioConstraints::kGoogBeamforming, false },
 #if defined(OS_WIN)
   { kMediaStreamAudioDucking, true },
 #else
   { kMediaStreamAudioDucking, false },
 #endif
   { kMediaStreamAudioHotword, false },
 };
 
 bool IsAudioProcessingConstraint(const std::string& key) {
   // |kMediaStreamAudioDucking| does not require audio processing.
@@ skipping 293 matching lines @@
   }
 
   int median = 0, std = 0;
   if (!audio_processing->echo_cancellation()->GetDelayMetrics(&median, &std)) {
     stats->echo_delay_median_ms = median;
     stats->echo_delay_std_ms = std;
   }
 }
 
 }  // namespace content