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()";
 
+  if (is_initialized_)
+    return;

[tommi (sloooow) - chröme, 2011/12/19 15:26:24]

maybe log a warning/error?

If ever we call Initialize more than once, we could in theory be passing in
different arguments the second time and then assume that the AudioDevice is
initialized with those parameters and not the ones that were actually used for
the successful initialization.

[Chris Rogers, 2011/12/19 21:40:35]

Agreed, I've added a DCHECK

On 2011/12/19 15:26:24, tommi wrote:

+
   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);
   }
 }