Browser-wide audio mirroring for TabCapture API

media/audio/virtual_audio_input_stream_unittest.cc

+// Copyright (c) 2012 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/message_loop.h"
+#include "base/synchronization/waitable_event.h"
+#include "media/audio/audio_manager.h"
+#include "media/audio/simple_sources.h"
+#include "media/audio/virtual_audio_input_stream.h"
+#include "media/audio/virtual_audio_output_stream.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+namespace media {
+
+// TODO(justinlin): Make these better..

[Alpha Left Google, 2012/11/28 01:04:47]

What does it mean by better? Need to document more in this comment.

[justinlin, 2012/11/28 14:30:31]

Was left as a TODO because this wasn't quite ready yet. Removed now.

+class VirtualAudioInputStreamTest : public testing::Test {
+ public:
+  VirtualAudioInputStreamTest()
+      : audio_manager_(AudioManager::Create()),
+        params_(
+            AudioParameters::AUDIO_MIRROR_BROWSER,
+            CHANNEL_LAYOUT_MONO, 8000, 8, 128),
+        output_params_(AudioParameters::AUDIO_PCM_LINEAR,
+            CHANNEL_LAYOUT_MONO, 8000, 8, 128),
+        done_(false, false),
+        output_stream_(NULL),
+        source_(params_.channels(), 200.0, params_.sample_rate()) {
+  }
+
+  void AddStreamOnAudioThread() {
+    ASSERT_TRUE(audio_manager_->GetMessageLoop()->BelongsToCurrentThread());
+
+    output_stream_ = audio_manager_->MakeAudioOutputStream(output_params_);
+    output_stream_->Open();
+
+    EXPECT_EQ(1u, static_cast<VirtualAudioInputStream*>(stream_)->
+                      converters_.size());
+
+    output_stream_->Start(&source_);
+    audio_manager_->GetMessageLoop()->PostTask(FROM_HERE, base::Bind(
+        &VirtualAudioInputStreamTest::EndTest, base::Unretained(this), 1));
+  }
+
+  void EndTest(int callbacks) {
+    if (output_stream_) {
+      output_stream_->Stop();
+      output_stream_->Close();
+    }
+
+    stream_->Stop();
+    stream_->Close();
+
+    EXPECT_EQ(callbacks, source_.callbacks());
+    EXPECT_EQ(0, source_.errors());
+
+    done_.Signal();
+  }
+
+ protected:
+  scoped_ptr<AudioManager> audio_manager_;
+  AudioParameters params_;
+  AudioParameters output_params_;
+  VirtualAudioInputStream* stream_;
+  base::WaitableEvent done_;
+  std::vector<AudioOutputStream*> output_streams_;
+  AudioOutputStream* output_stream_;
+  SineWaveAudioSource source_;
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(VirtualAudioInputStreamTest);
+};
+
+TEST_F(VirtualAudioInputStreamTest, AttachAndReadVirtualAudioOutputStream) {
+  stream_ = static_cast<VirtualAudioInputStream*>(
+      audio_manager_->MakeAudioInputStream(params_, "1"));
+  DCHECK(stream_);
+
+  audio_manager_->GetMessageLoop()->PostTask(FROM_HERE, base::Bind(
+      &VirtualAudioInputStreamTest::AddStreamOnAudioThread,
+      base::Unretained(this)));
+
+  done_.Wait();
+}
+
+}  // namespace media