Add IPC interface for switching the audio output device for a given audio stream in the browser.

The goal is to add support for the Audio Output Devices API (http://w3c.github.io/mediacapture-output/)

BUG=438023

Review URL: https://codereview.chromium.org/1171953002

Cr-Commit-Position: refs/heads/master@{#333963}

3 files changed, 23 insertions, 0 deletions

diff --git a/media/audio/audio_logging.h b/media/audio/audio_logging.h
index 913b8ec..4d7551f 100644
--- a/media/audio/audio_logging.h
+++ b/media/audio/audio_logging.h
@@ -43,6 +43,11 @@ class AudioLog {
 
   // Called when an audio component changes volume.  |volume| is the new volume.
   virtual void OnSetVolume(int component_id, double volume) = 0;
+
+  // Called when an audio component switches output device. |device_id| is the
+  // new audio output device.
+  virtual void OnSwitchOutputDevice(int component_id,
+                                    const std::string& device_id) = 0;
 };
 
 // AudioLogFactory dispenses AudioLog instances to owning classes for tracking
diff --git a/media/audio/audio_output_ipc.h b/media/audio/audio_output_ipc.h
index f85d8e0..05e4b28 100644
--- a/media/audio/audio_output_ipc.h
+++ b/media/audio/audio_output_ipc.h
@@ -5,13 +5,27 @@
 #ifndef MEDIA_AUDIO_AUDIO_OUTPUT_IPC_H_
 #define MEDIA_AUDIO_AUDIO_OUTPUT_IPC_H_
 
+#include <string>
+
 #include "base/memory/shared_memory.h"
 #include "base/sync_socket.h"
 #include "media/audio/audio_parameters.h"
 #include "media/base/media_export.h"
+#include "url/gurl.h"
 
 namespace media {
 
+// Result of an audio output device switch operation
+enum SwitchOutputDeviceResult {
+  SWITCH_OUTPUT_DEVICE_RESULT_SUCCESS = 0,
+  SWITCH_OUTPUT_DEVICE_RESULT_ERROR_NOT_FOUND,
+  SWITCH_OUTPUT_DEVICE_RESULT_ERROR_NOT_AUTHORIZED,
+  SWITCH_OUTPUT_DEVICE_RESULT_ERROR_OBSOLETE,
+  SWITCH_OUTPUT_DEVICE_RESULT_ERROR_NOT_SUPPORTED,
+  SWITCH_OUTPUT_DEVICE_RESULT_LAST =
+      SWITCH_OUTPUT_DEVICE_RESULT_ERROR_NOT_SUPPORTED,
+};
+
 // Contains IPC notifications for the state of the server side
 // (AudioOutputController) audio state changes and when an AudioOutputController
 // has been created.  Implemented by AudioOutputDevice.
diff --git a/media/audio/fake_audio_log_factory.cc b/media/audio/fake_audio_log_factory.cc
index e8677f2..fd5cf45 100644
--- a/media/audio/fake_audio_log_factory.cc
+++ b/media/audio/fake_audio_log_factory.cc
@@ -4,6 +4,8 @@
 
 #include "media/audio/fake_audio_log_factory.h"
 
+#include <string>
+
 namespace media {
 
 class FakeAudioLogImpl : public AudioLog {
@@ -18,6 +20,8 @@ class FakeAudioLogImpl : public AudioLog {
   void OnClosed(int component_id) override {}
   void OnError(int component_id) override {}
   void OnSetVolume(int component_id, double volume) override {}
+  void OnSwitchOutputDevice(int component_id,
+                            const std::string& device_id) override {}
 };
 
 FakeAudioLogFactory::FakeAudioLogFactory() {}