media/mojo/services/mojo_cdm_service_context.h

   1 // Copyright 2015 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_SERVICE_CONTEXT_H_
   6 #define MEDIA_MOJO_SERVICES_MOJO_CDM_SERVICE_CONTEXT_H_
   7
   8 #include <map>
   9
  10 #include "base/macros.h"
  11 #include "base/memory/weak_ptr.h"
  12 #include "media/base/cdm_context.h"
  13 #include "media/base/media_export.h"
  14
  15 namespace media {
  16
  17 class MojoCdmService;
  18
  19 // A class that creates, owns and manages all MojoCdmService instances.
  20 class MEDIA_EXPORT MojoCdmServiceContext : public CdmContextProvider {
  21  public:
  22   MojoCdmServiceContext();
  23   ~MojoCdmServiceContext() override;
  24
  25   base::WeakPtr<MojoCdmServiceContext> GetWeakPtr();
  26
  27   // Registers The |cdm_service| with |cdm_id|.
  28   void RegisterCdm(int cdm_id, MojoCdmService* cdm_service);
  29
  30   // Unregisters the CDM. Must be called before the CDM is destroyed.
  31   void UnregisterCdm(int cdm_id);
  32
  33   // CdmContextProvider implementation.
  34   // The returned CdmContext can be destroyed at any time if the pipe is
  35   // disconnected.
  36   // TODO(xhwang): When implementing SetCdm(), make sure we never dereference
  37   // garbage. For example, use media::PlayerTracker.
  38   CdmContext* GetCdmContext(int32_t cdm_id) override;
  39
  40  private:
  41   // A map between CDM ID and MojoCdmService.
  42   std::map<int, MojoCdmService*> cdm_services_;
  43
  44   // NOTE: Weak pointers must be invalidated before all other member variables.
  45   base::WeakPtrFactory<MojoCdmServiceContext> weak_ptr_factory_;
  46
  47   DISALLOW_COPY_AND_ASSIGN(MojoCdmServiceContext);
  48 };
  49
  50 }  // namespace media
  51
  52 #endif  // MEDIA_MOJO_SERVICES_MOJO_CDM_SERVICE_CONTEXT_H_