Encrypted Media: Implement IPC based SetCdm().

content/renderer/media/android/renderer_media_player_manager.h

 // Copyright 2013 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.
 
 #ifndef CONTENT_RENDERER_MEDIA_ANDROID_RENDERER_MEDIA_PLAYER_MANAGER_H_
 #define CONTENT_RENDERER_MEDIA_ANDROID_RENDERER_MEDIA_PLAYER_MANAGER_H_
 
 #include <map>
 #include <string>
 #include <vector>
@@ skipping 17 matching lines @@
 
 namespace content {
 
 class ProxyMediaKeys;
 class WebMediaPlayerAndroid;
 
 // Class for managing all the WebMediaPlayerAndroid objects in the same
 // RenderView.
 class RendererMediaPlayerManager : public RenderViewObserver {
  public:
+  static const int kInvalidCdmId = 0;
+
   // Constructs a RendererMediaPlayerManager object for the |render_view|.
   RendererMediaPlayerManager(RenderView* render_view);
   virtual ~RendererMediaPlayerManager();
 
   // RenderViewObserver overrides.
   virtual bool OnMessageReceived(const IPC::Message& msg) OVERRIDE;
 
   // Initializes a MediaPlayerAndroid object in browser process.
   void Initialize(MediaPlayerHostMsg_Initialize_Type type,
                   int player_id,
@@ skipping 25 matching lines @@
 
   // Destroys the player in the browser process
   void DestroyPlayer(int player_id);
 
   // Requests the player to enter fullscreen.
   void EnterFullscreen(int player_id, blink::WebFrame* frame);
 
   // Requests the player to exit fullscreen.
   void ExitFullscreen(int player_id);
 
+  // Requests the player with |player_id| to use the CDM with |cdm_id|.
+  // Does nothing if |cdm_id| is kInvalidCdmId.

[ddorwin, 2014/03/25 23:03:59]

Why? Shouldn't it detach the two? (Equivalent to setMediaKeys(0))

Do we have appropriate code for setMediaKeys(other_cdm_id) or should we assert
that this is not the case (valid ID => valid ID transition)?

Oh... because we might send this for Clear Key?

[xhwang, 2014/03/26 06:02:04]

No, we don't support setMediaKeys(0). Currently we do nothing when
setMediaKeys(0) is called (see WMPA).

With l.86, WMPA can always call manager_->SetCdm(GetCdmId()) without checking
GetCdmId(). This is consistent with
decryptor_ready_cb_.Run(web_cdm_->GetDecryptor()), where we don't check
GetDecryptor().

+  void SetCdm(int player_id, int cdm_id);
+
 #if defined(VIDEO_HOLE)
   // Requests an external surface for out-of-band compositing.
   void RequestExternalSurface(int player_id, const gfx::RectF& geometry);
 
   // RenderViewObserver overrides.
   virtual void DidCommitCompositorFrame() OVERRIDE;
 #endif  // defined(VIDEO_HOLE)
 
   // Encrypted media related methods.
   void InitializeCdm(int cdm_id,
@@ skipping 100 matching lines @@
 
   // WebFrame of pending fullscreen request.
   blink::WebFrame* pending_fullscreen_frame_;
 
   DISALLOW_COPY_AND_ASSIGN(RendererMediaPlayerManager);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_RENDERER_MEDIA_ANDROID_RENDERER_MEDIA_PLAYER_MANAGER_H_