[Merged] media: Properly tell whether the buffer is encrypted

media/base/decrypt_config.h

 // Copyright (c) 2012 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_DECRYPT_CONFIG_H_
 #define MEDIA_BASE_DECRYPT_CONFIG_H_
 
 #include <stdint.h>
 
 #include <iosfwd>
@@ skipping 38 matching lines @@
   //   of the subsample sizes.
   DecryptConfig(const std::string& key_id,
                 const std::string& iv,
                 const std::vector<SubsampleEntry>& subsamples);
   ~DecryptConfig();
 
   const std::string& key_id() const { return key_id_; }
   const std::string& iv() const { return iv_; }
   const std::vector<SubsampleEntry>& subsamples() const { return subsamples_; }
 
+  // Returns true if the corresponding decoder buffer requires decryption and
+  // false if that buffer is clear despite the presense of DecryptConfig.
+  bool is_encrypted() const { return !key_id_.empty() && !iv_.empty(); }
+
   // Returns true if all fields in |config| match this config.
   bool Matches(const DecryptConfig& config) const;
 
   // Prints to std::ostream.
   std::ostream& Print(std::ostream& os) const;
 
  private:
   const std::string key_id_;
 
   // Initialization vector.
   const std::string iv_;
 
   // Subsample information. May be empty for some formats, meaning entire frame
   // (less data ignored by data_offset_) is encrypted.
   const std::vector<SubsampleEntry> subsamples_;
 
   DISALLOW_COPY_AND_ASSIGN(DecryptConfig);
 };
 
 }  // namespace media
 
 inline std::ostream& operator<<(std::ostream& os,
                                 const media::DecryptConfig& obj) {
   return obj.Print(os);
 }
 
 #endif  // MEDIA_BASE_DECRYPT_CONFIG_H_