media/mojo/services/mojo_cdm.h

   1 // Copyright 2014 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #ifndef MEDIA_MOJO_SERVICES_MOJO_CDM_H_
   6 #define MEDIA_MOJO_SERVICES_MOJO_CDM_H_
   7
   8 #include "base/macros.h"
   9 #include "base/memory/weak_ptr.h"
  10 #include "media/base/media_keys.h"
  11 #include "media/mojo/interfaces/content_decryption_module.mojom.h"
  12 #include "media/mojo/services/mojo_type_trait.h"
  13
  14 namespace mojo {
  15 class ServiceProvider;
  16 }
  17
  18 namespace media {
  19
  20 // A MediaKeys that proxies to a mojo::ContentDecryptionModule. That
  21 // mojo::ContentDecryptionModule proxies back to the MojoCdm via the
  22 // mojo::ContentDecryptionModuleClient interface.
  23 class MojoCdm : public MediaKeys, public mojo::ContentDecryptionModuleClient {
  24  public:
  25   // |media_renderer_provider| is a ServiceProvider from a connected
  26   //     Application that is hosting a mojo::MediaRenderer.
  27   MojoCdm(mojo::ContentDecryptionModulePtr remote_cdm,
  28           const SessionMessageCB& session_message_cb,
  29           const SessionClosedCB& session_closed_cb,
  30           const SessionErrorCB& session_error_cb,
  31           const SessionKeysChangeCB& session_keys_change_cb,
  32           const SessionExpirationUpdateCB& session_expiration_update_cb);
  33   ~MojoCdm() final;
  34
  35   // MediaKeys implementation.
  36   void SetServerCertificate(const uint8_t* certificate_data,
  37                             int certificate_data_length,
  38                             scoped_ptr<SimpleCdmPromise> promise) final;
  39   void CreateSessionAndGenerateRequest(
  40       SessionType session_type,
  41       const std::string& init_data_type,
  42       const uint8_t* init_data,
  43       int init_data_length,
  44       scoped_ptr<NewSessionCdmPromise> promise) final;
  45   void LoadSession(SessionType session_type,
  46                    const std::string& session_id,
  47                    scoped_ptr<NewSessionCdmPromise> promise) final;
  48   void UpdateSession(const std::string& session_id,
  49                      const uint8_t* response,
  50                      int response_length,
  51                      scoped_ptr<SimpleCdmPromise> promise) final;
  52   void CloseSession(const std::string& session_id,
  53                     scoped_ptr<SimpleCdmPromise> promise) final;
  54   void RemoveSession(const std::string& session_id,
  55                      scoped_ptr<SimpleCdmPromise> promise) final;
  56   CdmContext* GetCdmContext() final;
  57
  58  private:
  59   // mojo::ContentDecryptionModuleClient implementation.
  60   void OnSessionMessage(const mojo::String& session_id,
  61                         mojo::CdmMessageType message_type,
  62                         mojo::Array<uint8_t> message,
  63                         const mojo::String& legacy_destination_url) final;
  64   void OnSessionClosed(const mojo::String& session_id) final;
  65   void OnSessionError(const mojo::String& session_id,
  66                       mojo::CdmException exception,
  67                       uint32_t system_code,
  68                       const mojo::String& error_message) final;
  69   void OnSessionKeysChange(
  70       const mojo::String& session_id,
  71       bool has_additional_usable_key,
  72       mojo::Array<mojo::CdmKeyInformationPtr> keys_info) final;
  73   void OnSessionExpirationUpdate(const mojo::String& session_id,
  74                                  int64_t new_expiry_time_usec) final;
  75
  76   // Callbacks to handle CDM promises.
  77   // We have to inline this method, since MS VS 2013 compiler fails to compile
  78   // it when this method is not inlined. It fails with error C2244
  79   // "unable to match function definition to an existing declaration".
  80   template <typename... T>
  81   void OnPromiseResult(scoped_ptr<CdmPromiseTemplate<T...>> promise,
  82                        mojo::CdmPromiseResultPtr result,
  83                        typename MojoTypeTrait<T>::MojoType... args) {
  84     if (result->success)
  85       promise->resolve(args.template To<T>()...);  // See ISO C++03 14.2/4.
  86     else
  87       RejectPromise(promise.Pass(), result.Pass());
  88   }
  89
  90   mojo::ContentDecryptionModulePtr remote_cdm_;
  91   mojo::Binding<ContentDecryptionModuleClient> binding_;
  92
  93   // Callbacks for firing session events.
  94   SessionMessageCB session_message_cb_;
  95   SessionClosedCB session_closed_cb_;
  96   SessionErrorCB session_error_cb_;
  97   SessionKeysChangeCB session_keys_change_cb_;
  98   SessionExpirationUpdateCB session_expiration_update_cb_;
  99
 100   base::WeakPtrFactory<MojoCdm> weak_factory_;
 101
 102   DISALLOW_COPY_AND_ASSIGN(MojoCdm);
 103 };
 104
 105 }  // namespace media
 106
 107 #endif  // MEDIA_MOJO_SERVICES_MOJO_CDM_H_