Macro-based constraints

third_party/WebKit/public/platform/WebMediaConstraints.h

 /*
  * Copyright (C) 2012 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 212 matching lines @@
     WebString toString() const override;
     bool hasExact() const { return m_hasExact; }
 
 private:
     unsigned m_ideal : 1;
     unsigned m_exact : 1;
     unsigned m_hasIdeal : 1;
     unsigned m_hasExact : 1;
 };
 
+// This macro defines all the constraint names and their types.
+// The expansion of CONSTRAINT_ITEM will depend on context.
+#define CONSTRAINT_LIST \
+    CONSTRAINT_ITEM(width, Width, Long)    \
+    CONSTRAINT_ITEM(height, Height, Long)  \
+        CONSTRAINT_ITEM(aspectRatio, AspectRatio, Double) \
+        CONSTRAINT_ITEM(frameRate, FrameRate, Double) \
+        CONSTRAINT_ITEM(facingMode, FacingMode, String) \
+        CONSTRAINT_ITEM(volume, Volume, Double) \
+        CONSTRAINT_ITEM(sampleRate, SampleRate, Long) \
+        CONSTRAINT_ITEM(sampleSize, SampleSize, Long) \
+        CONSTRAINT_ITEM(echoCancellation, EchoCancellation, Boolean) \
+        CONSTRAINT_ITEM(latency, Latency, Double) \
+        CONSTRAINT_ITEM(channelCount, ChannelCount, Long) \
+        CONSTRAINT_ITEM(deviceId, DeviceId, String) \
+        CONSTRAINT_ITEM(groupId, GroupId, String)
+// End of list.
+
+
 struct WebMediaTrackConstraintSet {
 public:
     BLINK_PLATFORM_EXPORT WebMediaTrackConstraintSet();
+    bool dummy; // added purely for init-call reasons
+#define CONSTRAINT_ITEM(lowercase, uppercase, datatype) \
+    datatype##Constraint lowercase;
 
-    LongConstraint width;
-    LongConstraint height;
-    DoubleConstraint aspectRatio;
-    DoubleConstraint frameRate;
-    StringConstraint facingMode;
-    DoubleConstraint volume;
-    LongConstraint sampleRate;
-    LongConstraint sampleSize;
-    BooleanConstraint echoCancellation;
-    DoubleConstraint latency;
-    LongConstraint channelCount;
-    StringConstraint deviceId;
-    StringConstraint groupId;
+    CONSTRAINT_LIST
+
+#undef CONSTRAINT_ITEM
+
     // Constraints not exposed in Blink at the moment, only through
     // the legacy name interface.
     StringConstraint mediaStreamSource; // tab, screen, desktop, system
     BooleanConstraint renderToAssociatedSink;
     BooleanConstraint hotwordEnabled;
     BooleanConstraint googEchoCancellation;
     BooleanConstraint googExperimentalEchoCancellation;
     BooleanConstraint googAutoGainControl;
     BooleanConstraint googExperimentalAutoGainControl;
     BooleanConstraint googNoiseSuppression;
@@ skipping 66 matching lines @@
 
     BLINK_PLATFORM_EXPORT const WebString toString() const;
 
 private:
     WebPrivatePtr<WebMediaConstraintsPrivate> m_private;
 };
 
 } // namespace blink
 
 #endif // WebMediaConstraints_h