Pass network config constraint as base64 to avoid mangling bytes

webrtc/sdk/objc/Framework/Classes/RTCMediaConstraints.mm

 /*
  *  Copyright 2015 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.
  */
 
@@ skipping 14 matching lines @@
 NSString * const kRTCMediaConstraintsMinHeight =
     @(webrtc::MediaConstraintsInterface::kMinHeight);
 NSString * const kRTCMediaConstraintsMaxHeight =
     @(webrtc::MediaConstraintsInterface::kMaxHeight);
 NSString * const kRTCMediaConstraintsMinFrameRate =
     @(webrtc::MediaConstraintsInterface::kMinFrameRate);
 NSString * const kRTCMediaConstraintsMaxFrameRate =
     @(webrtc::MediaConstraintsInterface::kMaxFrameRate);
 NSString * const kRTCMediaConstraintsLevelControl =
     @(webrtc::MediaConstraintsInterface::kLevelControl);
+NSString * const kRTCMediaConstraintsAudioNetworkAdaptorConfig =
+    @(webrtc::MediaConstraintsInterface::kAudioNetworkAdaptorConfig);
 
 NSString * const kRTCMediaConstraintsValueTrue =
     @(webrtc::MediaConstraintsInterface::kValueTrue);
 NSString * const kRTCMediaConstraintsValueFalse =
     @(webrtc::MediaConstraintsInterface::kValueFalse);
 
 namespace webrtc {
 
 MediaConstraints::~MediaConstraints() {}
 
@@ skipping 57 matching lines @@
 + (webrtc::MediaConstraintsInterface::Constraints)
     nativeConstraintsForConstraints:
         (NSDictionary<NSString *, NSString *> *)constraints {
   webrtc::MediaConstraintsInterface::Constraints nativeConstraints;
   for (NSString *key in constraints) {
     NSAssert([key isKindOfClass:[NSString class]],
              @"%@ is not an NSString.", key);
     NSString *value = [constraints objectForKey:key];
     NSAssert([value isKindOfClass:[NSString class]],
              @"%@ is not an NSString.", value);
-    nativeConstraints.push_back(webrtc::MediaConstraintsInterface::Constraint(
-        key.stdString, value.stdString));
+    if ([kRTCMediaConstraintsAudioNetworkAdaptorConfig isEqualToString:key]) {
+      // This value is base64 encoded.
+      NSData *charData = [[NSData alloc] initWithBase64EncodedString:value options:0];
+      std::string configValue =
+          std::string(reinterpret_cast<const char *>(charData.bytes), charData.length);
+      nativeConstraints.push_back(webrtc::MediaConstraintsInterface::Constraint(
+          key.stdString, configValue));
+    } else {
+      nativeConstraints.push_back(webrtc::MediaConstraintsInterface::Constraint(
+          key.stdString, value.stdString));
+    }
   }
   return nativeConstraints;
 }
 
 @end