1 files changed, 56 insertions, 0 deletions
diff --git a/third_party/libwebrtc/sdk/objc/api/peerconnection/RTCFieldTrials.mm b/third_party/libwebrtc/sdk/objc/api/peerconnection/RTCFieldTrials.mm
new file mode 100644
index 0000000000..193da9e4f7
--- /dev/null
+++ b/third_party/libwebrtc/sdk/objc/api/peerconnection/RTCFieldTrials.mm
@@ -0,0 +1,56 @@
+/*
+ *  Copyright 2016 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.
+ */
+
+#import "RTCFieldTrials.h"
+
+#include <memory>
+
+#import "base/RTCLogging.h"
+
+#include "system_wrappers/include/field_trial.h"
+
+NSString *const kRTCFieldTrialAudioForceABWENoTWCCKey = @"WebRTC-Audio-ABWENoTWCC";
+NSString * const kRTCFieldTrialFlexFec03AdvertisedKey = @"WebRTC-FlexFEC-03-Advertised";
+NSString * const kRTCFieldTrialFlexFec03Key = @"WebRTC-FlexFEC-03";
+NSString * const kRTCFieldTrialH264HighProfileKey = @"WebRTC-H264HighProfile";
+NSString * const kRTCFieldTrialMinimizeResamplingOnMobileKey =
+    @"WebRTC-Audio-MinimizeResamplingOnMobile";
+NSString *const kRTCFieldTrialUseNWPathMonitor = @"WebRTC-Network-UseNWPathMonitor";
+NSString * const kRTCFieldTrialEnabledValue = @"Enabled";
+
+// InitFieldTrialsFromString stores the char*, so the char array must outlive
+// the application.
+static char *gFieldTrialInitString = nullptr;
+
+void RTCInitFieldTrialDictionary(NSDictionary<NSString *, NSString *> *fieldTrials) {
+  if (!fieldTrials) {
+    RTCLogWarning(@"No fieldTrials provided.");
+    return;
+  }
+  // Assemble the keys and values into the field trial string.
+  // We don't perform any extra format checking. That should be done by the underlying WebRTC calls.
+  NSMutableString *fieldTrialInitString = [NSMutableString string];
+  for (NSString *key in fieldTrials) {
+    NSString *fieldTrialEntry = [NSString stringWithFormat:@"%@/%@/", key, fieldTrials[key]];
+    [fieldTrialInitString appendString:fieldTrialEntry];
+  }
+  size_t len = fieldTrialInitString.length + 1;
+  if (gFieldTrialInitString != nullptr) {
+    delete[] gFieldTrialInitString;
+  }
+  gFieldTrialInitString = new char[len];
+  if (![fieldTrialInitString getCString:gFieldTrialInitString
+                              maxLength:len
+                               encoding:NSUTF8StringEncoding]) {
+    RTCLogError(@"Failed to convert field trial string.");
+    return;
+  }
+  webrtc::field_trial::InitFieldTrialsFromString(gFieldTrialInitString);
+}