Add Promises for EME (Chromium side)

content/renderer/pepper/content_decryptor_delegate.h

 // Copyright (c) 2012 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_PEPPER_CONTENT_DECRYPTOR_DELEGATE_H_
 #define CONTENT_RENDERER_PEPPER_CONTENT_DECRYPTOR_DELEGATE_H_
 
+#include <map>
 #include <queue>
 #include <string>
 
 #include "base/basictypes.h"
 #include "base/callback_helpers.h"
 #include "base/compiler_specific.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/weak_ptr.h"
 #include "media/base/channel_layout.h"
 #include "media/base/decryptor.h"
@@ skipping 18 matching lines @@
   // ContentDecryptorDelegate does not take ownership of
   // |plugin_decryption_interface|. Therefore |plugin_decryption_interface|
   // must outlive this object.
   ContentDecryptorDelegate(
       PP_Instance pp_instance,
       const PPP_ContentDecryptor_Private* plugin_decryption_interface);
   ~ContentDecryptorDelegate();
 
   // This object should not be accessed after |fatal_plugin_error_cb| is called.
   void Initialize(const std::string& key_system,
-                  const media::SessionCreatedCB& session_created_cb,
                   const media::SessionMessageCB& session_message_cb,
                   const media::SessionReadyCB& session_ready_cb,
                   const media::SessionClosedCB& session_closed_cb,
                   const media::SessionErrorCB& session_error_cb,
                   const base::Closure& fatal_plugin_error_cb);
 
   void InstanceCrashed();
 
   // Provides access to PPP_ContentDecryptor_Private.
-  bool CreateSession(uint32 session_id,
-                     const std::string& content_type,
+  void CreateSession(const std::string& init_data_type,
                      const uint8* init_data,
-                     int init_data_length);
-  void LoadSession(uint32 session_id, const std::string& web_session_id);
-  bool UpdateSession(uint32 session_id,
+                     int init_data_length,
+                     media::MediaKeys::SessionType session_type,
+                     scoped_ptr<media::CdmNewSessionPromise> promise);
+  void LoadSession(const std::string& web_session_id,
+                   scoped_ptr<media::CdmNewSessionPromise> promise);
+  void UpdateSession(const std::string& web_session_id,
                      const uint8* response,
-                     int response_length);
-  bool ReleaseSession(uint32 session_id);
+                     int response_length,
+                     scoped_ptr<media::CdmChangeSessionPromise> promise);
+  void ReleaseSession(const std::string& web_session_id,
+                      scoped_ptr<media::CdmChangeSessionPromise> promise);
   bool Decrypt(media::Decryptor::StreamType stream_type,
                const scoped_refptr<media::DecoderBuffer>& encrypted_buffer,
                const media::Decryptor::DecryptCB& decrypt_cb);
   bool CancelDecrypt(media::Decryptor::StreamType stream_type);
   bool InitializeAudioDecoder(
       const media::AudioDecoderConfig& decoder_config,
       const media::Decryptor::DecoderInitCB& decoder_init_cb);
   bool InitializeVideoDecoder(
       const media::VideoDecoderConfig& decoder_config,
       const media::Decryptor::DecoderInitCB& decoder_init_cb);
   // TODO(tomfinegan): Add callback args for DeinitializeDecoder() and
   // ResetDecoder()
   bool DeinitializeDecoder(media::Decryptor::StreamType stream_type);
   bool ResetDecoder(media::Decryptor::StreamType stream_type);
   // Note: These methods can be used with unencrypted data.
   bool DecryptAndDecodeAudio(
       const scoped_refptr<media::DecoderBuffer>& encrypted_buffer,
       const media::Decryptor::AudioDecodeCB& audio_decode_cb);
   bool DecryptAndDecodeVideo(
       const scoped_refptr<media::DecoderBuffer>& encrypted_buffer,
       const media::Decryptor::VideoDecodeCB& video_decode_cb);
 
   // PPB_ContentDecryptor_Private dispatching methods.
-  void OnSessionCreated(uint32 session_id, PP_Var web_session_id_var);
-  void OnSessionMessage(uint32 session_id,
-                        PP_Var message,
-                        PP_Var destination_url);
-  void OnSessionReady(uint32 session_id);
-  void OnSessionClosed(uint32 session_id);
-  void OnSessionError(uint32 session_id,
-                      int32_t media_error,
-                      uint32_t system_code);
+  void OnPromiseResolved(uint32 promise_id);
+  void OnPromiseResolvedWithSession(uint32 promise_id,
+                                    PP_Var web_session_id_var);
+  void OnPromiseRejected(uint32 promise_id,
+                         PP_ExceptionCodeType exception_code,

[ddorwin, 2014/05/13 22:44:02]

Is there a reason this has "Type"?

[jrummell, 2014/05/15 22:38:09]

I just looked at the last entry in pp_content_decryptor.idl and assumed it was
the convention. But looks like it's not necessary, so it's removed.

+                         uint32 system_code,
+                         PP_Var error_description_var);
+  void OnSessionMessage(PP_Var web_session_id_var,
+                        PP_Var message_var,
+                        PP_Var destination_url_var);
+  void OnSessionReady(PP_Var web_session_id_var);
+  void OnSessionClosed(PP_Var web_session_id_var);
+  void OnSessionError(PP_Var web_session_id_var,
+                      PP_ExceptionCodeType exception_code,
+                      uint32 system_code,
+                      PP_Var error_description_var);
   void DeliverBlock(PP_Resource decrypted_block,
                     const PP_DecryptedBlockInfo* block_info);
   void DecoderInitializeDone(PP_DecryptorStreamType decoder_type,
                              uint32_t request_id,
                              PP_Bool success);
   void DecoderDeinitializeDone(PP_DecryptorStreamType decoder_type,
                                uint32_t request_id);
   void DecoderResetDone(PP_DecryptorStreamType decoder_type,
                         uint32_t request_id);
   void DeliverFrame(PP_Resource decrypted_frame,
@@ skipping 57 matching lines @@
 
   // Deserializes audio data stored in |audio_frames| into individual audio
   // buffers in |frames|. Returns true upon success.
   bool DeserializeAudioFrames(PP_Resource audio_frames,
                               size_t data_size,
                               media::SampleFormat sample_format,
                               media::Decryptor::AudioBuffers* frames);
 
   void SatisfyAllPendingCallbacksOnError();
 
+  // Takes ownership of |promise| and returns an identifier to be passed via
+  // Pepper.
+  uint32_t SaveVoidPromise(scoped_ptr<media::CdmChangeSessionPromise> promise);
+  uint32_t SaveSessionPromise(scoped_ptr<media::CdmNewSessionPromise> promise);
+
+  // Find the promise for a specified |promise_id|. Caller is responsible to
+  // delete the CdmPromise<> once done with it.
+  scoped_ptr<media::CdmChangeSessionPromise> RetrieveVoidPromise(

[ddorwin, 2014/05/13 22:44:02]

"Take" is probably a better term (and used elsewhere).

[jrummell, 2014/05/15 22:38:09]

Done.

+      uint32_t promise_id);
+  scoped_ptr<media::CdmNewSessionPromise> RetrieveSessionPromise(
+      uint32_t promise_id);
+
   const PP_Instance pp_instance_;
   const PPP_ContentDecryptor_Private* const plugin_decryption_interface_;
 
   // TODO(ddorwin): Remove after updating the Pepper API to not use key system.
   std::string key_system_;
 
   // Callbacks for firing session events.
-  media::SessionCreatedCB session_created_cb_;
   media::SessionMessageCB session_message_cb_;
   media::SessionReadyCB session_ready_cb_;
   media::SessionClosedCB session_closed_cb_;
   media::SessionErrorCB session_error_cb_;
 
   // Callback to notify that unexpected error happened and |this| should not
   // be used anymore.
   base::Closure fatal_plugin_error_cb_;
 
   gfx::Size natural_size_;
@@ skipping 15 matching lines @@
   scoped_refptr<PPB_Buffer_Impl> audio_input_resource_;
   scoped_refptr<PPB_Buffer_Impl> video_input_resource_;
 
   std::queue<uint32_t> free_buffers_;
 
   // Keep track of audio parameters.
   int audio_samples_per_second_;
   int audio_channel_count_;
   media::ChannelLayout audio_channel_layout_;
 
+  // Keep track of outstanding promises. |promises_| has ownership of the
+  // promise.
+  uint32_t next_promise_id_;
+  std::map<uint32_t, media::CdmChangeSessionPromise*> void_promises_;
+  std::map<uint32_t, media::CdmNewSessionPromise*> session_promises_;
+
   base::WeakPtr<ContentDecryptorDelegate> weak_this_;
   base::WeakPtrFactory<ContentDecryptorDelegate> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(ContentDecryptorDelegate);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_RENDERER_PEPPER_CONTENT_DECRYPTOR_DELEGATE_H_