Non-constraint interfaces for all constrainable interfaces

webrtc/api/mediaconstraintsinterface.cc

 /*
  *  Copyright 2013 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 111 matching lines @@
     if (mandatory_constraints)
       ++*mandatory_constraints;
     return rtc::FromString(string_value, value);
   }
   if (constraints->GetOptional().FindFirst(key, &string_value)) {
     return rtc::FromString(string_value, value);
   }
   return false;
 }
 
+// As above, but for integers.
+bool FindConstraint(const MediaConstraintsInterface* constraints,
+                    const std::string& key,
+                    int* value,
+                    size_t* mandatory_constraints) {
+  std::string string_value;
+  if (!constraints) {
+    return false;
+  }
+  if (constraints->GetMandatory().FindFirst(key, &string_value)) {
+    if (mandatory_constraints)
+      ++*mandatory_constraints;
+    return rtc::FromString(string_value, value);
+  }
+  if (constraints->GetOptional().FindFirst(key, &string_value)) {
+    return rtc::FromString(string_value, value);
+  }
+  return false;
+}
+
+rtc::Optional<bool> ConstraintToOptionalBool(
+    const MediaConstraintsInterface* constraints,
+    const std::string& key) {
+  bool value;
+  bool present = FindConstraint(constraints, key, &value, nullptr);
+  if (present) {
+    return rtc::Optional<bool>(value);
+  }
+  return rtc::Optional<bool>();
+}
+
+rtc::Optional<int> ConstraintToOptionalInt(
+    const MediaConstraintsInterface* constraints,
+    const std::string& key) {
+  int value;
+  bool present = FindConstraint(constraints, key, &value, nullptr);
+  if (present) {
+    return rtc::Optional<int>(value);
+  }
+  return rtc::Optional<int>();
+}
+
 }  // namespace webrtc