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

content/renderer/media/webrtc_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/webrtc_audio_processor_options.h"
+
+#include "base/logging.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;
+}
+
+// Extract all these methods to a helper class.
+void EnableEchoCancellation(AudioProcessing* audio_processing) {
+#if defined(IOS) || defined(ANDROID)
+  // Mobile devices are using AECM.
+  if (audio_processing->echo_control_mobile()->Enable(true))
+    NOTREACHED();
+
+  if (audio_processing->echo_control_mobile()->set_routing_mode(
+      webrtc::EchoControlMobile::kSpeakerphone))
+    NOTREACHED();
+#else
+  if (audio_processing->echo_cancellation()->Enable(true))
+    NOTREACHED();
+  if (audio_processing->echo_cancellation()->set_suppression_level(
+      webrtc::EchoCancellation::kHighSuppression))
+    NOTREACHED();
+
+  // Enable the metrics for AEC.
+  if (audio_processing->echo_cancellation()->enable_metrics(true))
+    NOTREACHED();
+  if (audio_processing->echo_cancellation()->enable_delay_logging(true))
+    NOTREACHED();
+#endif
+}
+
+void EnableNoiseSuppression(AudioProcessing* audio_processing) {
+  if (audio_processing->noise_suppression()->set_level(
+      webrtc::NoiseSuppression::kHigh))
+    NOTREACHED();
+
+  if (audio_processing->noise_suppression()->Enable(true))
+    NOTREACHED();
+}
+
+void EnableHighPassFilter(AudioProcessing* audio_processing) {
+  if (audio_processing->high_pass_filter()->Enable(true))
+     NOTREACHED();
+}
+
+// TODO(xians): stereo swapping
+void EnableTypingDetection(AudioProcessing* audio_processing) {
+  if (audio_processing->voice_detection()->Enable(true))
+    NOTREACHED();
+
+  if (audio_processing->voice_detection()->set_likelihood(
+      webrtc::VoiceDetection::kVeryLowLikelihood))
+    NOTREACHED();
+}
+
+void EnableExperimentalEchoCancellation(AudioProcessing* audio_processing) {
+  webrtc::Config config;
+  config.Set<webrtc::DelayCorrection>(new webrtc::DelayCorrection(true));
+  audio_processing->SetExtraOptions(config);
+}
+
+void StartAecDump(AudioProcessing* audio_processin) {

[Jói, 2013/11/08 13:36:40]

audio_processing -> audio_processing

[no longer working on chromium, 2013/11/08 15:39:30]

Done.

+  static const char kAecDumpFilename[] = "/tmp/audio.aecdump";

[Jói, 2013/11/08 13:36:40]

This won't work on Windows. Can you build a path using PathService?

[no longer working on chromium, 2013/11/08 15:39:30]

Talked to Henrik G about this, and decided to keep exactly the same behaviours
as what Libjingle does today:
static const char kAecDumpByAudioOptionFilename[] = "/tmp/audio.aecdump";
#elif defined(ANDROID)
static const char kAecDumpByAudioOptionFilename[] = "/sdcard/audio.aecdump";
#else
static const char kAecDumpByAudioOptionFilename[] = "audio.aecdump";
#endif


Joi, I have to admit that I don't know much about the PathService and FilePath,
please point it out if what I am doing is not proper.

[Jói, 2013/11/08 16:44:22]

Looks good.

+  if (audio_processin->StartDebugRecording(kAecDumpFilename))
+    DLOG(ERROR) << "Fail to start AEC debug recording";
+}
+
+void StopAecDump(AudioProcessing* audio_processin) {

[Jói, 2013/11/08 13:36:40]

audio_processin -> audio_processing

[no longer working on chromium, 2013/11/08 15:39:30]

Done.

+  if (audio_processin->StopDebugRecording())
+    DLOG(ERROR) << "Fail to stop AEC debug recording";
+}
+
+}  // namespace content