Added a kEchoCancellation constraint to turn off the audio processing.

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/string_number_conversions.h"
 #include "base/strings/utf_string_conversions.h"
 #include "content/common/media/media_stream_options.h"
+#include "content/renderer/media/media_stream_constraints_util.h"
 #include "content/renderer/media/rtc_media_constraints.h"
 #include "media/audio/audio_parameters.h"
 #include "third_party/WebKit/public/platform/WebMediaConstraints.h"
-#include "third_party/libjingle/source/talk/app/webrtc/mediaconstraintsinterface.h"
 #include "third_party/webrtc/modules/audio_processing/include/audio_processing.h"
 #include "third_party/webrtc/modules/audio_processing/typing_detection.h"
 
 namespace content {
 
+const char kEchoCancellation[] = "echoCancellation";
+const char kGoogEchoCancellation[] = "googEchoCancellation";
+const char kGoogExperimentalEchoCancellation[] = "googEchoCancellation2";
+const char kGoogAutoGainControl[] = "googAutoGainControl";
+const char kGoogExperimentalAutoGainControl[] = "googAutoGainControl2";
+const char kGoogNoiseSuppression[] = "googNoiseSuppression";
+const char kGoogExperimentalNoiseSuppression[] = "googNoiseSuppression2";
+const char kGoogHighpassFilter[] = "googHighpassFilter";
+const char kGoogTypingNoiseDetection[] = "googTypingNoiseDetection";
+const char kGoogAudioMirroring[] = "googAudioMirroring";
+
 namespace {
 
 // Constant constraint keys which enables default audio constraints on
 // mediastreams with audio.
 struct {
   const char* key;
-  const char* value;
+  bool value;
 } const kDefaultAudioConstraints[] = {
-  { webrtc::MediaConstraintsInterface::kEchoCancellation,
-    webrtc::MediaConstraintsInterface::kValueTrue },
+  { kEchoCancellation, true },
+  { kGoogEchoCancellation, true },
 #if defined(OS_CHROMEOS) || defined(OS_MACOSX)
   // Enable the extended filter mode AEC on platforms with known echo issues.
-  { webrtc::MediaConstraintsInterface::kExperimentalEchoCancellation,
-    webrtc::MediaConstraintsInterface::kValueTrue },
+  { kGoogExperimentalEchoCancellation, true },
+#else
+  { kGoogExperimentalEchoCancellation, false },
 #endif
-  { webrtc::MediaConstraintsInterface::kAutoGainControl,
-    webrtc::MediaConstraintsInterface::kValueTrue },
-  { webrtc::MediaConstraintsInterface::kExperimentalAutoGainControl,
-    webrtc::MediaConstraintsInterface::kValueTrue },
-  { webrtc::MediaConstraintsInterface::kNoiseSuppression,
-    webrtc::MediaConstraintsInterface::kValueTrue },
-  { webrtc::MediaConstraintsInterface::kHighpassFilter,
-    webrtc::MediaConstraintsInterface::kValueTrue },
-  { webrtc::MediaConstraintsInterface::kTypingNoiseDetection,
-    webrtc::MediaConstraintsInterface::kValueTrue },
+  { kGoogAutoGainControl, true },
+  { kGoogExperimentalAutoGainControl, true },
+  { kGoogNoiseSuppression, true },
+  { kGoogHighpassFilter, true },
+  { kGoogTypingNoiseDetection, true },
 #if defined(OS_WIN)
-  { content::kMediaStreamAudioDucking,
-    webrtc::MediaConstraintsInterface::kValueTrue },
+  { kMediaStreamAudioDucking, true },
+#else
+  { kMediaStreamAudioDucking, false },
 #endif
 };
 
+bool GetDefaultValueForConstraint(const blink::WebMediaConstraints& constraints,
+                                  const std::string& key) {
+  // Audio processing is false for gUM of non-default kMediaStreamSource.

[perkj_chrome, 2014/04/11 11:45:04]

 ? of non-default ? isn't kMediaStreamSource always true for tab capture.
Comment seems to be misleading.

[no longer working on chromium, 2014/04/11 16:47:05]

changed the comment to
// The default audio processing is false for gUM with a specific
kMediaStreamSource.
wdyt?

[perkj_chrome, 2014/04/14 12:15:19]

Please explain what  kMediaStreamSource is. The name  kMediaStreamSource is
misleading it itself since it actually means TAB or screen capture right? 

+  std::string value;
+  if (GetConstraintValue(constraints, kMediaStreamSource, &value))
+    return false;
+
+  for (size_t i = 0; i < ARRAYSIZE_UNSAFE(kDefaultAudioConstraints); ++i) {
+    if (kDefaultAudioConstraints[i].key == key)
+      return kDefaultAudioConstraints[i].value;
+  }
+
+  return false;
+}
+
 } // namespace
 
+// TODO(xians): Remove this method after the APM in WebRtc is deprecated.
 void ApplyFixedAudioConstraints(RTCMediaConstraints* constraints) {
   for (size_t i = 0; i < ARRAYSIZE_UNSAFE(kDefaultAudioConstraints); ++i) {
     bool already_set_value;
     if (!webrtc::FindConstraint(constraints, kDefaultAudioConstraints[i].key,
                                 &already_set_value, NULL)) {
-      constraints->AddOptional(kDefaultAudioConstraints[i].key,
-          kDefaultAudioConstraints[i].value, false);
+      const std::string value = kDefaultAudioConstraints[i].value ?
+          webrtc::MediaConstraintsInterface::kValueTrue :
+          webrtc::MediaConstraintsInterface::kValueFalse;
+      constraints->AddOptional(kDefaultAudioConstraints[i].key, value, false);
     } else {
       DVLOG(1) << "Constraint " << kDefaultAudioConstraints[i].key
                << " already set to " << already_set_value;
     }
   }
 }
 
+// TODO(xians): Remove this method after the APM in WebRtc is deprecated.
 bool NeedsAudioProcessing(const blink::WebMediaConstraints& constraints,
                           int effects) {
-  RTCMediaConstraints native_constraints(constraints);
-  ApplyFixedAudioConstraints(&native_constraints);
-  if (effects & media::AudioParameters::ECHO_CANCELLER) {
-    // If platform echo canceller is enabled, disable the software AEC.
-    native_constraints.AddOptional(
-        MediaConstraintsInterface::kEchoCancellation,
-        MediaConstraintsInterface::kValueFalse, true);
-  }
   for (size_t i = 0; i < ARRAYSIZE_UNSAFE(kDefaultAudioConstraints); ++i) {
-    bool value = false;
-    if (webrtc::FindConstraint(&native_constraints,
-                               kDefaultAudioConstraints[i].key, &value, NULL) &&
-        value) {
+    if (GetPropertyFromConstraints(constraints,
+                                   kDefaultAudioConstraints[i].key,
+                                   effects)) {
       return true;
     }
   }
 
   return false;
 }
 
-bool GetPropertyFromConstraints(const MediaConstraintsInterface* constraints,
-                                const std::string& key) {
+bool GetPropertyFromConstraints(const blink::WebMediaConstraints& constraints,
+                                const std::string& key,
+                                int effects) {
+  if (effects & media::AudioParameters::ECHO_CANCELLER &&
+      key == kGoogEchoCancellation) {
+    // If platform echo canceller is enabled, disable the software AEC.
+    return false;

[no longer working on chromium, 2014/04/11 08:56:30]

Andrew, could you please take a look at this?

Previously, we mapped a const blink::WebMediaConstraints object into a writable
RTCMediaConstraints object, so we could modify the RTC constraints when the
effect was enabled, but we can't do it any more, so I simply return false for
kGoogEchoCancellation when the effect is enabled.

[perkj_chrome, 2014/04/11 11:45:04]

Forgot to add Andrew?

[no longer working on chromium, 2014/04/11 16:47:05]

Thanks.

+  }
+
+  // Return the value if the constraint is specified in |constraints|,
+  // otherwise return the default value.
   bool value = false;
-  return webrtc::FindConstraint(constraints, key, &value, NULL) && value;
+  if (!GetConstraintValue(constraints, key, &value))
+    value = GetDefaultValueForConstraint(constraints, key);
+
+  return value;
+}
+
+bool IsValid(const blink::WebMediaConstraints& constraints) {
+  blink::WebVector<blink::WebMediaConstraint> mandatory;
+  constraints.getMandatoryConstraints(mandatory);
+  for (size_t i = 0; i < mandatory.size(); ++i) {
+    if (mandatory[i].m_name.utf8() == kMediaStreamSource)
+      continue;
+
+    bool valid = false;
+    for (size_t j = 0; j < ARRAYSIZE_UNSAFE(kDefaultAudioConstraints); ++j) {
+      if (mandatory[i].m_name.utf8() == kDefaultAudioConstraints[j].key) {
+        valid = true;
+        break;
+      }
+    }
+
+    if (!valid) {
+      DLOG(ERROR) << "Invalid MediaStream constraint. Name:"
+                  <<  mandatory[i].m_name.utf8();
+      return false;
+    }
+  }
+
+  return true;
 }
 
 void EnableEchoCancellation(AudioProcessing* audio_processing) {
 #if defined(OS_ANDROID)
   // Mobile devices are using AECM.
   int err = audio_processing->echo_control_mobile()->set_routing_mode(
       webrtc::EchoControlMobile::kSpeakerphone);
   err |= audio_processing->echo_control_mobile()->Enable(true);
   CHECK_EQ(err, 0);
 #else
@@ skipping 103 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