Refactoring to share MockAudioOutputStream implementations across 3 platforms

media/audio/fake_audio_output_stream.cc

Index: media/audio/fake_audio_output_stream.cc
diff --git a/media/audio/fake_audio_output_stream.cc b/media/audio/fake_audio_output_stream.cc
index e69de29bb2d1d6434b8b29ae775ad8c2e48c5391..6eb541788861d47fa52871aa418062a2638f9a1d 100644
--- a/media/audio/fake_audio_output_stream.cc
+++ b/media/audio/fake_audio_output_stream.cc
@@ -0,0 +1,72 @@
+// Copyright (c) 2009 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 "base/at_exit.h"
+#include "media/audio/fake_audio_output_stream.h"
+
+bool FakeAudioOutputStream::has_created_fake_stream_ = false;
+FakeAudioOutputStream* FakeAudioOutputStream::last_fake_stream_ = NULL;
+
+// static
+AudioOutputStream* FakeAudioOutputStream::MakeFakeStream() {
+  if (!has_created_fake_stream_)
+    base::AtExitManager::RegisterCallback(&DestroyLastFakeStream, NULL);
+  has_created_fake_stream_ = true;
+
+  return new FakeAudioOutputStream();
+}
+
+// static
+FakeAudioOutputStream* FakeAudioOutputStream::GetLastFakeStream() {
+  return last_fake_stream_;
+}
+
+bool FakeAudioOutputStream::Open(size_t packet_size) {
+  if (packet_size < sizeof(int16))
+    return false;
+  packet_size_ = packet_size;
+  buffer_.reset(new char[packet_size_]);
+  return true;
+}
+
+void FakeAudioOutputStream::Start(AudioSourceCallback* callback)  {
+  callback_ = callback;
+  memset(buffer_.get(), 0, packet_size_);
+  callback_->OnMoreData(this, buffer_.get(), packet_size_);
+}
+
+void FakeAudioOutputStream::Stop() {
+}
+
+void FakeAudioOutputStream::SetVolume(double left_level, double right_level) {
+  left_volume_ = left_level;
+  right_volume_ = right_level;
+}
+
+void FakeAudioOutputStream::GetVolume(double* left_level, double* right_level) {
+  *left_level = left_volume_;
+  *right_level = right_volume_;
+}
+
+void FakeAudioOutputStream::Close() {
+  callback_->OnClose(this);
+  callback_ = NULL;
+
+  if (last_fake_stream_)
+    delete last_fake_stream_;
+  last_fake_stream_ = this;
+}
+
+FakeAudioOutputStream::FakeAudioOutputStream()
+    : left_volume_(0),
+      right_volume_(0),
+      callback_(NULL),
+      packet_size_(0) {
+}
+
+// static
+void FakeAudioOutputStream::DestroyLastFakeStream(void* param) {
+  if (last_fake_stream_)
+    delete last_fake_stream_;
+}