Add DecryptingDemuxerStream.

media/base/decryptor.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_DECRYPTOR_H_
 #define MEDIA_BASE_DECRYPTOR_H_
 
 #include <list>
 #include <string>
 
@@ skipping 38 matching lines @@
 
   // TODO(xhwang): Replace kError with kDecryptError and kDecodeError.
   // TODO(xhwang): Replace kNeedMoreData with kNotEnoughData.
   enum Status {
     kSuccess,  // Decryption successfully completed. Decrypted buffer ready.
     kNoKey,  // No key is available to decrypt.
     kNeedMoreData,  // Decoder needs more data to produce a frame.
     kError  // Key is available but an error occurred during decryption.
   };
 
+  // TODO(xhwang): Unify this with DemuxerStream::Type.
   enum StreamType {
     kAudio,
     kVideo
   };
 
   Decryptor();
   virtual ~Decryptor();
 
   // Generates a key request for the |key_system| with |type| and
   // |init_data| provided.
@@ skipping 130 matching lines @@
   // The decoder can be reinitialized after it is uninitialized.
   virtual void DeinitializeDecoder(StreamType stream_type) = 0;
 
  private:
   DISALLOW_COPY_AND_ASSIGN(Decryptor);
 };
 
 }  // namespace media
 
 #endif  // MEDIA_BASE_DECRYPTOR_H_