Add groupid for media devices. Group audio devices.

media/audio/audio_manager_unittest.cc

Index: media/audio/audio_manager_unittest.cc
diff --git a/media/audio/audio_manager_unittest.cc b/media/audio/audio_manager_unittest.cc
index b878861d54d6ce66d605e2eef9a85e9186abf52e..daa3346b3c46adf500bb1b1b5cdd6fac494e9ae9 100644
--- a/media/audio/audio_manager_unittest.cc
+++ b/media/audio/audio_manager_unittest.cc
@@ -640,4 +640,67 @@ TEST_F(AudioManagerTest, GetAssociatedOutputDeviceID) {
 }
 #endif  // defined(USE_CRAS)
 
+class TestAudioManager : public FakeAudioManager {
+  // For testing the default implementation of GetGroupId(Input|Output)
+  // input$i is associated to output$i, if both exist.
+  // Default input is input1.
+  // Default output is output2.
+ public:
+  TestAudioManager(
+      scoped_refptr<base::SingleThreadTaskRunner> task_runner,
+      scoped_refptr<base::SingleThreadTaskRunner> worker_task_runner,
+      AudioLogFactory* audio_log_factory)
+      : FakeAudioManager(task_runner, worker_task_runner, audio_log_factory) {}
+
+  void GetAudioInputDeviceNames(AudioDeviceNames* device_names) override {
+    device_names->emplace_back("Input 1", "input1");
+    device_names->emplace_back("Input 2", "input2");
+    device_names->emplace_back("Input 3", "input3");
+    device_names->push_front(AudioDeviceName::CreateDefault());
+  }
+
+  void GetAudioOutputDeviceNames(AudioDeviceNames* device_names) override {
+    device_names->emplace_back("Output 1", "output1");
+    device_names->emplace_back("Output 2", "output2");
+    device_names->emplace_back("Output 4", "output4");
+    device_names->push_front(AudioDeviceName::CreateDefault());
+  }
+
+  std::string GetDefaultOutputDeviceID() override { return "output4"; }
+
+  std::string GetAssociatedOutputDeviceID(
+      const std::string& input_id) override {
+    if (input_id == "input1")
+      return "output1";
+    else if (input_id == "input2")
+      return "output2";
+    else if (input_id == "default")
+      return "output1";
+    return "";
+  }
+};
+
+TEST_F(AudioManagerTest, GetGroupId) {
+  CreateAudioManagerForTesting<TestAudioManager>();
+  // Groups:
+  // 0: input1, output1, default input
+  // 1: input2, output2
+  // 2: input3,
+  // 3: output4, default output
+  std::vector<std::string> group;
+  group.push_back(audio_manager_->GetGroupIDInput("input1"));
+  group.push_back(audio_manager_->GetGroupIDInput("input2"));
+  group.push_back(audio_manager_->GetGroupIDInput("input3"));
+  group.push_back(audio_manager_->GetGroupIDOutput("output4"));
+  for (size_t i = 0; i < group.size(); ++i) {
+    for (size_t j = i + 1; j < group.size(); ++j) {
+      EXPECT_NE(group[i], group[j]);
+    }
+  }
+  EXPECT_EQ(group[0], audio_manager_->GetGroupIDOutput("output1"));
+  EXPECT_EQ(group[0], audio_manager_->GetGroupIDInput("default"));
+  EXPECT_EQ(group[1], audio_manager_->GetGroupIDOutput("output2"));
+  EXPECT_EQ(group[3], audio_manager_->GetGroupIDOutput("default"));
+}
+
 }  // namespace media