GMC: Media Session Controller set audio sink IPC

Added media player delegate messages to allow the
|MediaSessionController| to send set audio sink id messages to the renderer.

Bug: 1105169
Change-Id: Idb382bcf6c0457aeeb870cb9475483045acaaf90
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2295808
Commit-Queue: Noah Rose Ledesma <noahrose@google.com>
Reviewed-by: Guido Urdaneta <guidou@chromium.org>
Reviewed-by: Becca Hughes <beccahughes@chromium.org>
Reviewed-by: Nasko Oskov <nasko@chromium.org>
Cr-Commit-Position: refs/heads/master@{#794773}

content/browser/media/session/media_session_controller.cc

@@ -4,6 +4,7 @@
 
 #include "content/browser/media/session/media_session_controller.h"
 
+#include "content/browser/frame_host/render_frame_host_impl.h"
 #include "content/browser/media/media_devices_util.h"
 #include "content/browser/media/media_web_contents_observer.h"
 #include "content/browser/media/session/media_session_impl.h"
@@ -93,7 +94,23 @@ void MediaSessionController::OnExitPictureInPicture(int player_id) {
 
 void MediaSessionController::OnSetAudioSinkId(
     int player_id,
-    const std::string& raw_device_id) {}
+    const std::string& raw_device_id) {
+  // The sink id needs to be hashed before it is suitable for use in the
+  // renderer process.
+  auto salt_and_origin = content::GetMediaDeviceSaltAndOrigin(
+      id_.render_frame_host->GetProcess()->GetID(),
+      id_.render_frame_host->GetRoutingID());
+
+  std::string hashed_sink_id = GetHMACForMediaDeviceID(
+      salt_and_origin.device_id_salt, salt_and_origin.origin, raw_device_id);
+
+  // Grant the renderer the permission to use this audio output device.
+  static_cast<RenderFrameHostImpl*>(id_.render_frame_host)
+      ->SetAudioOutputDeviceIdForGlobalMediaControls(hashed_sink_id);
+
+  id_.render_frame_host->Send(new MediaPlayerDelegateMsg_SetAudioSinkId(
+      id_.render_frame_host->GetRoutingID(), id_.delegate_id, hashed_sink_id));
+}
 
 RenderFrameHost* MediaSessionController::render_frame_host() const {
   return id_.render_frame_host;

content/common/media/media_player_delegate_messages.h

@@ -74,6 +74,10 @@ IPC_MESSAGE_ROUTED1(MediaPlayerDelegateMsg_EnterPictureInPicture,
 IPC_MESSAGE_ROUTED1(MediaPlayerDelegateMsg_ExitPictureInPicture,
                     int /* delegate_id, distinguishes instances */)
 
+IPC_MESSAGE_ROUTED2(MediaPlayerDelegateMsg_SetAudioSinkId,
+                    int /* delegate_id, distinguishes instances */,
+                    std::string /* sink_id */)
+
 IPC_MESSAGE_ROUTED2(MediaPlayerDelegateMsg_NotifyPowerExperimentState,
                     int /* delegate_id, distinguishes instances */,
                     bool /* is experiment starting (true) or stopping? */)

content/renderer/media/renderer_webmediaplayer_delegate.cc

@@ -268,6 +268,8 @@ bool RendererWebMediaPlayerDelegate::OnMessageReceived(
                         OnMediaDelegateEnterPictureInPicture)
     IPC_MESSAGE_HANDLER(MediaPlayerDelegateMsg_ExitPictureInPicture,
                         OnMediaDelegateExitPictureInPicture)
+    IPC_MESSAGE_HANDLER(MediaPlayerDelegateMsg_SetAudioSinkId,
+                        OnMediaDelegateSetAudioSink)
     IPC_MESSAGE_HANDLER(MediaPlayerDelegateMsg_NotifyPowerExperimentState,
                         OnMediaDelegatePowerExperimentState)
     IPC_MESSAGE_UNHANDLED(return false)
@@ -397,6 +399,10 @@ void RendererWebMediaPlayerDelegate::OnMediaDelegateExitPictureInPicture(
     observer->OnExitPictureInPicture();
 }
 
+void RendererWebMediaPlayerDelegate::OnMediaDelegateSetAudioSink(
+    int player_id,
+    std::string sink_id) {}
+
 void RendererWebMediaPlayerDelegate::OnMediaDelegatePowerExperimentState(
     int player_id,
     bool state) {

content/renderer/media/renderer_webmediaplayer_delegate.h

@@ -105,6 +105,7 @@ class CONTENT_EXPORT RendererWebMediaPlayerDelegate
   void OnMediaDelegateBecamePersistentVideo(int player_id, bool value);
   void OnMediaDelegateEnterPictureInPicture(int player_id);
   void OnMediaDelegateExitPictureInPicture(int player_id);
+  void OnMediaDelegateSetAudioSink(int player_id, std::string sink_id);
   void OnMediaDelegatePowerExperimentState(int player_id, bool state);
 
   // Schedules UpdateTask() to run soon.