| // Copyright 2014 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 MEDIA_BASE_CDM_CONTEXT_H_ |
| #define MEDIA_BASE_CDM_CONTEXT_H_ |
| |
| #include "base/callback.h" |
| #include "base/macros.h" |
| #include "media/base/media_export.h" |
| |
| namespace media { |
| |
| class Decryptor; |
| |
| // An interface representing the context that a media pipeline needs from a |
| // content decryption module (CDM) to decrypt (and decode) encrypted buffers. |
| // Only used for implementing SetCdm(). |
| class MEDIA_EXPORT CdmContext { |
| public: |
| // Indicates an invalid CDM ID. See GetCdmId() for details. |
| static const int kInvalidCdmId = 0; |
| |
| virtual ~CdmContext(); |
| |
| // Gets the Decryptor object associated with the CDM. Returns nullptr if the |
| // CDM does not support a Decryptor. Must not return nullptr if GetCdmId() |
| // returns kInvalidCdmId. The returned object is only guaranteed to be valid |
| // during the CDM's lifetime. |
| virtual Decryptor* GetDecryptor() = 0; |
| |
| // Returns an ID that identifies a CDM, or kInvalidCdmId. The interpretation |
| // is implementation-specific; current implementations use the ID to locate a |
| // remote CDM in a different process. The return value will not be |
| // kInvalidCdmId if GetDecryptor() returns nullptr. |
| virtual int GetCdmId() const = 0; |
| |
| protected: |
| CdmContext(); |
| |
| private: |
| DISALLOW_COPY_AND_ASSIGN(CdmContext); |
| }; |
| |
| // An interface for looking up CdmContext objects by the CDM ID. |
| class MEDIA_EXPORT CdmContextProvider { |
| public: |
| virtual ~CdmContextProvider(); |
| |
| // Returns the CdmContext corresponding to |cdm_id|. Returns nullptr if no |
| // such CdmContext can be found. |
| // Note: Calling GetCdmId() on the returned CdmContext returns kInvalidCdmId |
| // (in all current cases) because the CDM will be local in the process where |
| // GetCdmContext() is called. |
| virtual CdmContext* GetCdmContext(int cdm_id) = 0; |
| |
| protected: |
| CdmContextProvider(); |
| |
| private: |
| DISALLOW_COPY_AND_ASSIGN(CdmContextProvider); |
| }; |
| |
| // Callback to notify that the CdmContext has been completely attached to |
| // the media pipeline. Parameter indicates whether the operation succeeded. |
| typedef base::Callback<void(bool)> CdmAttachedCB; |
| |
| // A dummy implementation of CdmAttachedCB. |
| MEDIA_EXPORT void IgnoreCdmAttached(bool success); |
| |
| } // namespace media |
| |
| #endif // MEDIA_BASE_CDM_CONTEXT_H_ |