Encrypted Media: Add config change support in DecryptingVideoDecoder.

media/filters/decrypting_video_decoder.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_FILTERS_DECRYPTING_VIDEO_DECODER_H_
 #define MEDIA_FILTERS_DECRYPTING_VIDEO_DECODER_H_
 
 #include "base/callback.h"
 #include "base/memory/ref_counted.h"
 #include "media/base/decryptor.h"
@@ skipping 37 matching lines @@
 
  private:
   // For a detailed state diagram please see this link: http://goo.gl/8jAok
   // TODO(xhwang): Add a ASCII state diagram in this file after this class
   // stabilizes.
   enum State {
     kUninitialized = 0,
     kDecryptorRequested,
     kPendingDecoderInit,
     kIdle,
+    kPendingConfigChange,
     kPendingDemuxerRead,
     kPendingDecode,
     kWaitingForKey,
     kDecodeFinished,
     kStopped
   };
 
   // Callback for DecryptorHost::RequestDecryptor().
   void SetDecryptor(Decryptor* decryptor);
 
-  // Callback for Decryptor::InitializeVideoDecoder().
+  // Callback for Decryptor::InitializeVideoDecoder() during initialization.
   void FinishInitialization(bool success);
 
+  // Callback for Decryptor::InitializeVideoDecoder() during config change.
+  void FinishConfigChange(bool success);
+
   void ReadFromDemuxerStream();
 
   // Callback for DemuxerStream::Read().
   void DecryptAndDecodeBuffer(DemuxerStream::Status status,
                               const scoped_refptr<DecoderBuffer>& buffer);
 
   void DecodePendingBuffer();
 
   // Callback for Decryptor::DecryptAndDecodeVideo().
   void DeliverFrame(int buffer_size,
@@ skipping 40 matching lines @@
   // A unique ID to trace Decryptor::DecryptAndDecodeVideo() call and the
   // matching DecryptCB call (in DoDeliverFrame()).
   uint32 trace_id_;
 
   DISALLOW_COPY_AND_ASSIGN(DecryptingVideoDecoder);
 };
 
 }  // namespace media
 
 #endif  // MEDIA_FILTERS_DECRYPTING_VIDEO_DECODER_H_