AudioBuffer numberOfChannels defaults to 1

third_party/WebKit/Source/modules/webaudio/AudioBuffer.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
@@ skipping 98 matching lines @@
   unsigned numberOfChannels;
   size_t numberOfFrames;
   float sampleRate;
 
   if (!options.hasNumberOfChannels()) {
     exceptionState.throwDOMException(
         NotFoundError, "AudioBufferOptions: numberOfChannels is required.");
     return nullptr;
   }
 
-  if (!options.hasLength()) {
-    exceptionState.throwDOMException(NotFoundError,
-                                     "AudioBufferOptions: length is required.");
-    return nullptr;
-  }
-
   numberOfChannels = options.numberOfChannels();
   numberOfFrames = options.length();
 
   if (options.hasSampleRate())
     sampleRate = options.sampleRate();
   else
     sampleRate = context->sampleRate();
 
   return create(numberOfChannels, numberOfFrames, sampleRate, exceptionState);
 }
@@ skipping 187 matching lines @@
 void AudioBuffer::zero() {
   for (unsigned i = 0; i < m_channels.size(); ++i) {
     if (DOMFloat32Array* array = getChannelData(i)) {
       float* data = array->data();
       memset(data, 0, length() * sizeof(*data));
     }
   }
 }
 
 }  // namespace blink