media/base/cdm_context.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_BASE_CDM_CONTEXT_H_
   6 #define MEDIA_BASE_CDM_CONTEXT_H_
   7
   8 #include "base/macros.h"
   9 #include "media/base/media_export.h"
  10
  11 namespace media {
  12
  13 class Decryptor;
  14
  15 // An interface representing the context that a media pipeline needs from a
  16 // content decryption module (CDM) to decrypt (and decode) encrypted buffers.
  17 class MEDIA_EXPORT CdmContext {
  18  public:
  19 #if defined(ENABLE_BROWSER_CDMS)
  20   static const int kInvalidCdmId = 0;
  21 #endif
  22
  23   virtual ~CdmContext();
  24
  25   // Gets the Decryptor object associated with the CDM. Returns NULL if no
  26   // Decryptor object is associated. The returned object is only guaranteed
  27   // to be valid during the CDM's lifetime.
  28   virtual Decryptor* GetDecryptor() = 0;
  29
  30 #if defined(ENABLE_BROWSER_CDMS)
  31   // Returns the CDM ID associated with |this|. May be kInvalidCdmId if no CDM
  32   // ID is associated.
  33   virtual int GetCdmId() const = 0;
  34 #endif
  35
  36  protected:
  37   CdmContext();
  38
  39  private:
  40   DISALLOW_COPY_AND_ASSIGN(CdmContext);
  41 };
  42
  43 }  // namespace media
  44
  45 #endif  // MEDIA_BASE_CDM_CONTEXT_H_