Integrate HTMLMediaElement with Web Audio API's MediaElementAudioSourceNode

content/renderer/media/audio_device.cc

 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "content/renderer/media/audio_device.h"
 
 #include "base/bind.h"
 #include "base/debug/trace_event.h"
 #include "base/message_loop.h"
 #include "base/time.h"
@@ skipping 42 matching lines @@
 }
 
 void AudioDevice::Initialize(size_t buffer_size,
                              int channels,
                              double sample_rate,
                              AudioParameters::Format latency_format,
                              RenderCallback* callback) {
   CHECK_EQ(0, stream_id_) <<
       "AudioDevice::Initialize() must be called before Start()";
 
+  DCHECK(!is_initialized_);
+  if (is_initialized_)
+    return;
+
   buffer_size_ = buffer_size;
   channels_ = channels;
   sample_rate_ = sample_rate;
   latency_format_ = latency_format;
   callback_ = callback;
 
   // Cleanup from any previous initialization.
   for (size_t i = 0; i < audio_data_.size(); ++i)
     delete [] audio_data_[i];
 
   audio_data_.reserve(channels);
   for (int i = 0; i < channels; ++i) {
     float* channel_data = new float[buffer_size];
     audio_data_.push_back(channel_data);
   }
 
   is_initialized_ = true;
 }
 
-bool AudioDevice::IsInitialized() {
-  return is_initialized_;
-}
-
 AudioDevice::~AudioDevice() {
   // The current design requires that the user calls Stop() before deleting
   // this class.
   CHECK_EQ(0, stream_id_);
   for (int i = 0; i < channels_; ++i)
     delete [] audio_data_[i];
 }
 
 void AudioDevice::Start() {
   AudioParameters params;
@@ skipping 239 matching lines @@
   if (audio_thread_.get()) {
     // Close the socket handler to terminate the main thread function in the
     // audio thread.
     {
       base::SyncSocket socket(socket_handle_);
     }
     audio_thread_->Join();
     audio_thread_.reset(NULL);
   }
 }