Declare intent to use sample-aes later in the stream.

media/formats/mp2t/descriptors.h

 // Copyright 2015 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_FORMATS_MP2T_DESCRIPTORS_H_
 #define MEDIA_FORMATS_MP2T_DESCRIPTORS_H_
 
 #include <stdint.h>
 
 #include <map>
 #include <string>
 
 namespace media {
 
 class BitReader;
+class EncryptionScheme;
 
 namespace mp2t {
 
 // Representation of a list of descriptors, used in the MPEG-2 Systems standard
 // to extend the definitions of programs or program elements. While the standard
 // appears to permit multiple descriptors in such a list to have the same tag
 // value, the implementation herein will not support this.
 class Descriptors {
  public:
   Descriptors();
@@ skipping 13 matching lines @@
 
   // Indicates whether a CA descriptor is present. If so, the |system_id|,
   // |pid|, and |private_data| values are populated with the contents of the
   // descriptor.
   bool HasCADescriptor(int* system_id,
                        int* pid,
                        std::string* private_data) const;
 
   // Indicates whether a CA descriptor is present, and if so, whether it is
   // of the type defined by ISO/IEC 23001-9:2014 (i.e. with a specific
-  // system_id value and layout of the private_data). If so, the |ca_pid| and
-  // |pssh_pid| are populated with the contents of the descriptor.
-  bool HasCADescriptorCenc(int* ca_pid, int* pssh_pid) const;
+  // system_id value and layout of the private_data). If so, the |ca_pid|,
+  // |pssh_pid| and |scheme| are populated with the contents of the descriptor.
+  bool HasCADescriptorCenc(int* ca_pid,
+                           int* pssh_pid,
+                           EncryptionScheme* scheme) const;
 
   // Indicates whether a Private Data Indicator descriptor is present with a
   // particular |value|.
   bool HasPrivateDataIndicator(int64_t value) const;
 
  private:
   using Descriptor = std::pair<int, std::string>;
   std::map<int, std::string> descriptors_;
 
   // Allow copy and assign so that it can be used in a std C++ container.
 };
 
 }  // namespace mp2t
 }  // namespace media
 
 #endif  // MEDIA_FORMATS_MP2T_DESCRIPTOR_LIST_H_