ChannelSplitterNode channelCount and mode are constant

third_party/WebKit/Source/modules/webaudio/ChannelSplitterNode.cpp

 /*
  * Copyright (C) 2010, 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:
  * 1.  Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2.  Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 20 matching lines @@
 #include "modules/webaudio/AudioNodeOutput.h"
 #include "modules/webaudio/BaseAudioContext.h"
 #include "modules/webaudio/ChannelSplitterOptions.h"
 
 namespace blink {
 
 ChannelSplitterHandler::ChannelSplitterHandler(AudioNode& node,
                                                float sampleRate,
                                                unsigned numberOfOutputs)
     : AudioHandler(NodeTypeChannelSplitter, node, sampleRate) {
+  // These properties are fixed and cannot be changed by the user.
+  m_channelCount = numberOfOutputs;
+  setInternalChannelCountMode(Explicit);
   addInput();
 
   // Create a fixed number of outputs (able to handle the maximum number of
   // channels fed to an input).
   for (unsigned i = 0; i < numberOfOutputs; ++i)
     addOutput(1);
 
   initialize();
 }
 
@@ skipping 21 matching lines @@
       // It would be nice to avoid the copy and simply pass along pointers, but
       // this becomes extremely difficult with fanout and fanin.
       destination->channel(0)->copyFrom(source->channel(i));
     } else if (output(i).renderingFanOutCount() > 0) {
       // Only bother zeroing out the destination if it's connected to anything
       destination->zero();
     }
   }
 }
 
+void ChannelSplitterHandler::setChannelCount(unsigned long channelCount,
+                                             ExceptionState& exceptionState) {
+  DCHECK(isMainThread());
+  BaseAudioContext::AutoLocker locker(context());
+
+  // channelCount cannot be changed from the number of outputs.
+  if (channelCount != numberOfOutputs()) {
+    exceptionState.throwDOMException(
+        InvalidStateError,
+        "ChannelSplitter: channelCount cannot be changed from " +
+            String::number(numberOfOutputs()));
+  }
+}
+
+void ChannelSplitterHandler::setChannelCountMode(
+    const String& mode,
+    ExceptionState& exceptionState) {
+  DCHECK(isMainThread());
+  BaseAudioContext::AutoLocker locker(context());
+
+  // channcelCountMode must be 'explicit'.
+  if (mode != "explicit") {
+    exceptionState.throwDOMException(
+        InvalidStateError,
+        "ChannelSplitter: channelCountMode cannot be changed from 'explicit'");
+  }
+}
+
 // ----------------------------------------------------------------
 
 ChannelSplitterNode::ChannelSplitterNode(BaseAudioContext& context,
                                          unsigned numberOfOutputs)
     : AudioNode(context) {
   setHandler(ChannelSplitterHandler::create(*this, context.sampleRate(),
                                             numberOfOutputs));
 }
 
 ChannelSplitterNode* ChannelSplitterNode::create(
@@ skipping 39 matching lines @@
 
   if (!node)
     return nullptr;
 
   node->handleChannelOptions(options, exceptionState);
 
   return node;
 }
 
 }  // namespace blink