Implement Audio Focus Manager for desktop.

content/browser/media/session/audio_focus_manager_unittest.cc

Index: content/browser/media/session/audio_focus_manager_unittest.cc
diff --git a/content/browser/media/session/audio_focus_manager_unittest.cc b/content/browser/media/session/audio_focus_manager_unittest.cc
new file mode 100644
index 0000000000000000000000000000000000000000..71e8a6c6875fed17625414b27ae4af6da343cec6
--- /dev/null
+++ b/content/browser/media/session/audio_focus_manager_unittest.cc
@@ -0,0 +1,350 @@
+// Copyright 2016 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/browser/media/session/audio_focus_manager.h"
+
+#include "content/browser/media/session/media_session.h"
+#include "content/public/test/mock_render_process_host.h"
+#include "content/public/test/test_browser_context.h"
+#include "content/public/test/test_browser_thread.h"
+#include "content/test/test_web_contents.h"
+
+namespace content {
+
+using AudioFocusType = AudioFocusManager::AudioFocusType;
+using SuspendType = MediaSession::SuspendType;
+
+class AudioFocusManagerTest : public testing::Test {
+ public:
+  const double kDuckingVolumeMultiplier = 0.2;
+  const double kDefaultVolumeMultiplier = 1.0;
+
+  AudioFocusManagerTest() : ui_thread_(BrowserThread::UI, &message_loop_) {}
+
+  void SetUp() override {
+    rph_factory_.reset(new MockRenderProcessHostFactory());
+    SiteInstanceImpl::set_render_process_host_factory(rph_factory_.get());
+    browser_context_.reset(new TestBrowserContext());
+  }
+
+  void TearDown() override {
+    browser_context_.reset();
+    SiteInstanceImpl::set_render_process_host_factory(nullptr);
+    rph_factory_.reset();
+  }
+
+  WebContents* GetAudioFocusedContent() const {
+    if (!AudioFocusManager::GetInstance()->focus_entry_)
+      return nullptr;
+    return AudioFocusManager::GetInstance()->focus_entry_->web_contents();
+  }
+
+  int GetTransientMaybeDuckCount() const {
+    return AudioFocusManager::GetInstance()->TransientMayDuckEntriesCount();
+  }
+
+  double GetVolumeMultiplier(MediaSession* session) {
+    return session->volume_multiplier_;
+  }
+
+  WebContents* CreateWebContents() {
+    return TestWebContents::Create(browser_context_.get(),
+        SiteInstance::SiteInstance::Create(browser_context_.get()));
+  }
+
+ private:
+  base::MessageLoopForUI message_loop_;
+  TestBrowserThread ui_thread_;
+
+  std::unique_ptr<MockRenderProcessHostFactory> rph_factory_;
+  std::unique_ptr<TestBrowserContext> browser_context_;
+};
+
+TEST_F(AudioFocusManagerTest, InstanceAvailableAndSame) {
+  AudioFocusManager* audio_focus_manager = AudioFocusManager::GetInstance();
+  ASSERT_TRUE(!!audio_focus_manager);
+  ASSERT_EQ(audio_focus_manager, AudioFocusManager::GetInstance());
+}
+
+TEST_F(AudioFocusManagerTest, RequestAudioFocusGain_ReplaceFocusedEntry) {
+  std::unique_ptr<WebContents> web_contents_1(CreateWebContents());
+  MediaSession* media_session_1 = MediaSession::Get(web_contents_1.get());
+
+  std::unique_ptr<WebContents> web_contents_2(CreateWebContents());
+  MediaSession* media_session_2 = MediaSession::Get(web_contents_2.get());
+
+  std::unique_ptr<WebContents> web_contents_3(CreateWebContents());
+  MediaSession* media_session_3 = MediaSession::Get(web_contents_3.get());
+
+  ASSERT_EQ(nullptr, GetAudioFocusedContent());
+
+  AudioFocusManager::GetInstance()->RequestAudioFocus(
+      media_session_1, AudioFocusManager::AudioFocusType::Gain);
+  ASSERT_EQ(web_contents_1.get(), GetAudioFocusedContent());
+
+  AudioFocusManager::GetInstance()->RequestAudioFocus(
+      media_session_2, AudioFocusManager::AudioFocusType::Gain);
+  ASSERT_EQ(web_contents_2.get(), GetAudioFocusedContent());
+
+  AudioFocusManager::GetInstance()->RequestAudioFocus(
+      media_session_3, AudioFocusManager::AudioFocusType::Gain);
+  ASSERT_EQ(web_contents_3.get(), GetAudioFocusedContent());
+}
+
+TEST_F(AudioFocusManagerTest, RequestAudioFocusGain_Duplicate) {
+  std::unique_ptr<WebContents> web_contents(CreateWebContents());
+  MediaSession* media_session = MediaSession::Get(web_contents.get());
+
+  ASSERT_EQ(nullptr, GetAudioFocusedContent());
+
+  AudioFocusManager::GetInstance()->RequestAudioFocus(
+      media_session, AudioFocusManager::AudioFocusType::Gain);
+  ASSERT_EQ(web_contents.get(), GetAudioFocusedContent());
+
+  AudioFocusManager::GetInstance()->RequestAudioFocus(
+      media_session, AudioFocusManager::AudioFocusType::Gain);
+  ASSERT_EQ(web_contents.get(), GetAudioFocusedContent());
+}
+
+TEST_F(AudioFocusManagerTest, RequestAudioFocusGain_FromTransient) {
+  std::unique_ptr<WebContents> web_contents(CreateWebContents());
+  MediaSession* media_session = MediaSession::Get(web_contents.get());
+
+  AudioFocusManager::GetInstance()->RequestAudioFocus(
+      media_session, AudioFocusManager::AudioFocusType::GainTransientMayDuck);
+  ASSERT_EQ(nullptr, GetAudioFocusedContent());
+  ASSERT_EQ(1, GetTransientMaybeDuckCount());
+
+  AudioFocusManager::GetInstance()->RequestAudioFocus(
+      media_session, AudioFocusManager::AudioFocusType::Gain);
+  ASSERT_EQ(web_contents.get(), GetAudioFocusedContent());
+  ASSERT_EQ(0, GetTransientMaybeDuckCount());
+}
+
+TEST_F(AudioFocusManagerTest, RequestAudioFocusTransient_FromGain) {
+  std::unique_ptr<WebContents> web_contents(CreateWebContents());
+  MediaSession* media_session = MediaSession::Get(web_contents.get());
+
+  AudioFocusManager::GetInstance()->RequestAudioFocus(
+      media_session, AudioFocusManager::AudioFocusType::Gain);
+  ASSERT_EQ(web_contents.get(), GetAudioFocusedContent());
+  ASSERT_EQ(0, GetTransientMaybeDuckCount());
+
+  AudioFocusManager::GetInstance()->RequestAudioFocus(
+      media_session, AudioFocusManager::AudioFocusType::GainTransientMayDuck);
+  ASSERT_EQ(nullptr, GetAudioFocusedContent());
+  ASSERT_EQ(1, GetTransientMaybeDuckCount());
+  ASSERT_EQ(kDefaultVolumeMultiplier, GetVolumeMultiplier(media_session));
+}
+
+TEST_F(AudioFocusManagerTest, RequestAudioFocusTransient_FromGainWhileDucking) {
+  std::unique_ptr<WebContents> web_contents_1(CreateWebContents());
+  MediaSession* media_session_1 = MediaSession::Get(web_contents_1.get());
+
+  std::unique_ptr<WebContents> web_contents_2(CreateWebContents());
+  MediaSession* media_session_2 = MediaSession::Get(web_contents_2.get());
+
+  AudioFocusManager::GetInstance()->RequestAudioFocus(
+      media_session_1, AudioFocusManager::AudioFocusType::Gain);
+  ASSERT_EQ(0, GetTransientMaybeDuckCount());
+  ASSERT_EQ(kDefaultVolumeMultiplier, GetVolumeMultiplier(media_session_1));
+
+  AudioFocusManager::GetInstance()->RequestAudioFocus(
+      media_session_2, AudioFocusManager::AudioFocusType::GainTransientMayDuck);
+  ASSERT_EQ(1, GetTransientMaybeDuckCount());
+  ASSERT_EQ(kDuckingVolumeMultiplier, GetVolumeMultiplier(media_session_1));
+
+  AudioFocusManager::GetInstance()->RequestAudioFocus(
+      media_session_1, AudioFocusManager::AudioFocusType::GainTransientMayDuck);
+  ASSERT_EQ(2, GetTransientMaybeDuckCount());
+  ASSERT_EQ(kDefaultVolumeMultiplier, GetVolumeMultiplier(media_session_1));
+}
+
+TEST_F(AudioFocusManagerTest, AbandonAudioFocus_RemovesFocusedEntry) {
+  std::unique_ptr<WebContents> web_contents(CreateWebContents());
+  MediaSession* media_session = MediaSession::Get(web_contents.get());
+
+  AudioFocusManager::GetInstance()->RequestAudioFocus(
+      media_session, AudioFocusManager::AudioFocusType::Gain);
+  ASSERT_EQ(web_contents.get(), GetAudioFocusedContent());
+
+  AudioFocusManager::GetInstance()->AbandonAudioFocus(media_session);
+  ASSERT_EQ(nullptr, GetAudioFocusedContent());
+}
+
+TEST_F(AudioFocusManagerTest, AbandonAudioFocus_NoAssociatedEntry) {
+  std::unique_ptr<WebContents> web_contents(CreateWebContents());
+  MediaSession* media_session = MediaSession::Get(web_contents.get());
+
+  AudioFocusManager::GetInstance()->AbandonAudioFocus(media_session);
+  ASSERT_EQ(nullptr, GetAudioFocusedContent());
+}
+
+TEST_F(AudioFocusManagerTest, AbandonAudioFocus_RemovesTransientEntry) {
+  std::unique_ptr<WebContents> web_contents(CreateWebContents());
+  MediaSession* media_session = MediaSession::Get(web_contents.get());
+
+  AudioFocusManager::GetInstance()->RequestAudioFocus(
+      media_session, AudioFocusManager::AudioFocusType::GainTransientMayDuck);
+  ASSERT_EQ(1, GetTransientMaybeDuckCount());
+
+  AudioFocusManager::GetInstance()->AbandonAudioFocus(media_session);
+  ASSERT_EQ(0, GetTransientMaybeDuckCount());
+}
+
+TEST_F(AudioFocusManagerTest, AbandonAudioFocus_WhileDuckingThenResume) {
+  std::unique_ptr<WebContents> web_contents_1(CreateWebContents());
+  MediaSession* media_session_1 = MediaSession::Get(web_contents_1.get());
+
+  std::unique_ptr<WebContents> web_contents_2(CreateWebContents());
+  MediaSession* media_session_2 = MediaSession::Get(web_contents_2.get());
+
+  AudioFocusManager::GetInstance()->RequestAudioFocus(
+      media_session_1, AudioFocusManager::AudioFocusType::Gain);
+  ASSERT_EQ(0, GetTransientMaybeDuckCount());
+  ASSERT_EQ(kDefaultVolumeMultiplier, GetVolumeMultiplier(media_session_1));
+
+  AudioFocusManager::GetInstance()->RequestAudioFocus(
+      media_session_2, AudioFocusManager::AudioFocusType::GainTransientMayDuck);
+  ASSERT_EQ(1, GetTransientMaybeDuckCount());
+  ASSERT_EQ(kDuckingVolumeMultiplier, GetVolumeMultiplier(media_session_1));
+
+  AudioFocusManager::GetInstance()->AbandonAudioFocus(media_session_1);
+  ASSERT_EQ(1, GetTransientMaybeDuckCount());
+
+  AudioFocusManager::GetInstance()->AbandonAudioFocus(media_session_2);
+  ASSERT_EQ(0, GetTransientMaybeDuckCount());
+
+  AudioFocusManager::GetInstance()->RequestAudioFocus(
+      media_session_1, AudioFocusManager::AudioFocusType::Gain);
+  ASSERT_EQ(kDefaultVolumeMultiplier, GetVolumeMultiplier(media_session_1));
+}
+
+TEST_F(AudioFocusManagerTest, AbandonAudioFocus_StopsDucking) {
+  std::unique_ptr<WebContents> web_contents_1(CreateWebContents());
+  MediaSession* media_session_1 = MediaSession::Get(web_contents_1.get());
+
+  std::unique_ptr<WebContents> web_contents_2(CreateWebContents());
+  MediaSession* media_session_2 = MediaSession::Get(web_contents_2.get());
+
+  AudioFocusManager::GetInstance()->RequestAudioFocus(
+      media_session_1, AudioFocusManager::AudioFocusType::Gain);
+  ASSERT_EQ(0, GetTransientMaybeDuckCount());
+  ASSERT_EQ(kDefaultVolumeMultiplier, GetVolumeMultiplier(media_session_1));
+
+  AudioFocusManager::GetInstance()->RequestAudioFocus(
+      media_session_2, AudioFocusManager::AudioFocusType::GainTransientMayDuck);
+  ASSERT_EQ(1, GetTransientMaybeDuckCount());
+  ASSERT_EQ(kDuckingVolumeMultiplier, GetVolumeMultiplier(media_session_1));
+
+  AudioFocusManager::GetInstance()->AbandonAudioFocus(media_session_2);
+  ASSERT_EQ(0, GetTransientMaybeDuckCount());
+  ASSERT_EQ(kDefaultVolumeMultiplier, GetVolumeMultiplier(media_session_1));
+
+}
+
+TEST_F(AudioFocusManagerTest, DuckWhilePlaying) {
+  std::unique_ptr<WebContents> web_contents_1(CreateWebContents());
+  MediaSession* media_session_1 = MediaSession::Get(web_contents_1.get());
+
+  std::unique_ptr<WebContents> web_contents_2(CreateWebContents());
+  MediaSession* media_session_2 = MediaSession::Get(web_contents_2.get());
+
+  AudioFocusManager::GetInstance()->RequestAudioFocus(
+      media_session_1, AudioFocusManager::AudioFocusType::Gain);
+  ASSERT_EQ(kDefaultVolumeMultiplier, GetVolumeMultiplier(media_session_1));
+
+  AudioFocusManager::GetInstance()->RequestAudioFocus(
+      media_session_2, AudioFocusManager::AudioFocusType::GainTransientMayDuck);
+  ASSERT_EQ(kDuckingVolumeMultiplier, GetVolumeMultiplier(media_session_1));
+}
+
+TEST_F(AudioFocusManagerTest, DuckWhenStarting) {
+  std::unique_ptr<WebContents> web_contents_1(CreateWebContents());
+  MediaSession* media_session_1 = MediaSession::Get(web_contents_1.get());
+
+  std::unique_ptr<WebContents> web_contents_2(CreateWebContents());
+  MediaSession* media_session_2 = MediaSession::Get(web_contents_2.get());
+
+  AudioFocusManager::GetInstance()->RequestAudioFocus(
+      media_session_2, AudioFocusManager::AudioFocusType::GainTransientMayDuck);
+
+  AudioFocusManager::GetInstance()->RequestAudioFocus(
+      media_session_1, AudioFocusManager::AudioFocusType::Gain);
+  ASSERT_EQ(kDuckingVolumeMultiplier, GetVolumeMultiplier(media_session_1));
+}
+
+TEST_F(AudioFocusManagerTest, DuckWithMultipleTransients) {
+  std::unique_ptr<WebContents> web_contents_1(CreateWebContents());
+  MediaSession* media_session_1 = MediaSession::Get(web_contents_1.get());
+
+  std::unique_ptr<WebContents> web_contents_2(CreateWebContents());
+  MediaSession* media_session_2 = MediaSession::Get(web_contents_2.get());
+
+  std::unique_ptr<WebContents> web_contents_3(CreateWebContents());
+  MediaSession* media_session_3 = MediaSession::Get(web_contents_3.get());
+
+  AudioFocusManager::GetInstance()->RequestAudioFocus(
+      media_session_1, AudioFocusManager::AudioFocusType::Gain);
+  ASSERT_EQ(kDefaultVolumeMultiplier, GetVolumeMultiplier(media_session_1));
+
+  AudioFocusManager::GetInstance()->RequestAudioFocus(
+      media_session_2, AudioFocusManager::AudioFocusType::GainTransientMayDuck);
+  ASSERT_EQ(kDuckingVolumeMultiplier, GetVolumeMultiplier(media_session_1));
+
+  AudioFocusManager::GetInstance()->RequestAudioFocus(
+      media_session_3, AudioFocusManager::AudioFocusType::GainTransientMayDuck);
+  ASSERT_EQ(kDuckingVolumeMultiplier, GetVolumeMultiplier(media_session_1));
+
+  AudioFocusManager::GetInstance()->AbandonAudioFocus(media_session_2);
+  ASSERT_EQ(kDuckingVolumeMultiplier, GetVolumeMultiplier(media_session_1));
+
+  AudioFocusManager::GetInstance()->AbandonAudioFocus(media_session_3);
+  ASSERT_EQ(kDefaultVolumeMultiplier, GetVolumeMultiplier(media_session_1));
+}
+
+TEST_F(AudioFocusManagerTest, WebContentsDestroyed_ReleasesFocus) {
+  std::unique_ptr<WebContents> web_contents(CreateWebContents());
+  MediaSession* media_session = MediaSession::Get(web_contents.get());
+
+  AudioFocusManager::GetInstance()->RequestAudioFocus(
+      media_session, AudioFocusManager::AudioFocusType::Gain);
+  ASSERT_EQ(web_contents.get(), GetAudioFocusedContent());
+
+  web_contents.reset();
+  ASSERT_EQ(nullptr, GetAudioFocusedContent());
+}
+
+TEST_F(AudioFocusManagerTest, WebContentsDestroyed_ReleasesTransients) {
+  std::unique_ptr<WebContents> web_contents(CreateWebContents());
+  MediaSession* media_session = MediaSession::Get(web_contents.get());
+
+  AudioFocusManager::GetInstance()->RequestAudioFocus(
+      media_session, AudioFocusManager::AudioFocusType::GainTransientMayDuck);
+  ASSERT_EQ(1, GetTransientMaybeDuckCount());
+
+  web_contents.reset();
+  ASSERT_EQ(0, GetTransientMaybeDuckCount());
+}
+
+TEST_F(AudioFocusManagerTest, WebContentsDestroyed_StopsDucking) {
+  std::unique_ptr<WebContents> web_contents_1(CreateWebContents());
+  MediaSession* media_session_1 = MediaSession::Get(web_contents_1.get());
+
+  std::unique_ptr<WebContents> web_contents_2(CreateWebContents());
+  MediaSession* media_session_2 = MediaSession::Get(web_contents_2.get());
+
+  AudioFocusManager::GetInstance()->RequestAudioFocus(
+      media_session_1, AudioFocusManager::AudioFocusType::Gain);
+  ASSERT_EQ(kDefaultVolumeMultiplier, GetVolumeMultiplier(media_session_1));
+
+  AudioFocusManager::GetInstance()->RequestAudioFocus(
+      media_session_2, AudioFocusManager::AudioFocusType::GainTransientMayDuck);
+  ASSERT_EQ(kDuckingVolumeMultiplier, GetVolumeMultiplier(media_session_1));
+
+  web_contents_2.reset();
+  ASSERT_EQ(kDefaultVolumeMultiplier, GetVolumeMultiplier(media_session_1));
+}
+
+}  // namespace content