Added an "enable-audio-processor" flag and WebRtcAudioProcessor class

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/logging.h"
+#include "base/path_service.h"
+#include "base/strings/utf_string_conversions.h"
+#include "third_party/libjingle/source/talk/app/webrtc/mediaconstraintsinterface.h"
+#include "third_party/webrtc/modules/audio_processing/include/audio_processing.h"
+
+namespace content {
+
+bool GetPropertyFromConstraints(const MediaConstraintsInterface* constraints,
+                                const std::string& key) {
+  bool value = false;
+  return webrtc::FindConstraint(constraints, key, &value, NULL) && value;
+}
+
+void EnableEchoCancellation(AudioProcessing* audio_processing) {
+#if defined(OS_IOS)
+  // On iOS, VPIO provides built-in EC and AGC.
+  return;
+#elif defined(OS_ANDROID)
+  // Mobile devices are using AECM.
+  int err = audio_processing->echo_control_mobile()->Enable(true);
+  err |= audio_processing->echo_control_mobile()->set_routing_mode(
+      webrtc::EchoControlMobile::kSpeakerphone);
+  CHECK_EQ(err, 0);
+#else
+  int err = audio_processing->echo_cancellation()->Enable(true);
+  err |= audio_processing->echo_cancellation()->set_suppression_level(
+      webrtc::EchoCancellation::kHighSuppression);
+
+  // Enable the metrics for AEC.
+  err |= audio_processing->echo_cancellation()->enable_metrics(true);
+  err |= audio_processing->echo_cancellation()->enable_delay_logging(true);
+  CHECK_EQ(err, 0);
+#endif
+}
+
+void EnableNoiseSuppression(AudioProcessing* audio_processing) {
+  int err = audio_processing->noise_suppression()->set_level(
+      webrtc::NoiseSuppression::kHigh);
+  err |= audio_processing->noise_suppression()->Enable(true);
+  CHECK_EQ(err, 0);
+}
+
+void EnableHighPassFilter(AudioProcessing* audio_processing) {
+  CHECK_EQ(audio_processing->high_pass_filter()->Enable(true), 0);
+}
+
+// TODO(xians): stereo swapping
+void EnableTypingDetection(AudioProcessing* audio_processing) {
+  int err = audio_processing->voice_detection()->Enable(true);
+  err |= audio_processing->voice_detection()->set_likelihood(
+      webrtc::VoiceDetection::kVeryLowLikelihood);
+  CHECK_EQ(err, 0);
+}
+
+void EnableExperimentalEchoCancellation(AudioProcessing* audio_processing) {
+  webrtc::Config config;
+  config.Set<webrtc::DelayCorrection>(new webrtc::DelayCorrection(true));
+  audio_processing->SetExtraOptions(config);
+}
+
+void StartAecDump(AudioProcessing* audio_processing) {
+  // TODO(grunell): Figure out a more suitable directory for the audio dump
+  // data.
+  base::FilePath path;
+#if defined(CHROMEOS)
+  PathService::Get(base::DIR_TEMP, &path);
+#elif defined(ANDROID)
+  path = base::FilePath(FILE_PATH_LITERAL("sdcard"));
+#else
+  PathService::Get(base::DIR_EXE, &path);
+#endif
+  base::FilePath file = path.Append(FILE_PATH_LITERAL("audio.aecdump"));
+
+#if defined(OS_WIN)
+  const std::string file_name = WideToUTF8(file.value());
+#else
+  const std::string file_name = file.value();
+#endif
+  if (audio_processing->StartDebugRecording(file_name.c_str()))
+    DLOG(ERROR) << "Fail to start AEC debug recording";
+}
+
+void StopAecDump(AudioProcessing* audio_processing) {
+  if (audio_processing->StopDebugRecording())
+    DLOG(ERROR) << "Fail to stop AEC debug recording";
+}
+
+}  // namespace content