Generalize AesDecryptor to make it more spec compliant.

media/crypto/decryptor_client.h

Index: media/crypto/decryptor_client.h
diff --git a/media/crypto/decryptor_client.h b/media/crypto/decryptor_client.h
new file mode 100644
index 0000000000000000000000000000000000000000..f658a02bb4688deb6b0d28f0e86528d48d456612
--- /dev/null
+++ b/media/crypto/decryptor_client.h
@@ -0,0 +1,45 @@
+// 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_CRYPTO_DECRYPTOR_CLIENT_H_
+#define MEDIA_CRYPTO_DECRYPTOR_CLIENT_H_
+
+#include <string>
+
+#include "base/memory/scoped_ptr.h"
+#include "media/crypto/aes_decryptor.h"
+
+namespace media {
+
+// Interface used by a decryptor to fire key events.
+// See: http://dvcs.w3.org/hg/html-media/raw-file/tip/encrypted-media/encrypted-media.html#event-summary
+class DecryptorClient {
+ public:
+  virtual ~DecryptorClient() {}

[ddorwin, 2012/06/11 21:02:40]

You can make this private (and non-virtual) and prevent anyone from deleting the
client with a DecryptorClient pointer, which would probably be a bad idea.

[xhwang, 2012/06/12 19:01:15]

Good to know! Done.

+
+  virtual void KeyAdded(const std::string& key_system,

[scherkus (not reviewing), 2012/06/12 03:15:58]

docs everywhere

[xhwang, 2012/06/12 19:01:15]

Done.

+                        const std::string& session_id) = 0;
+
+  // Signals that a key error happened. The |system_code| is key system
+  // dependent. For clear key system, the |system_code| is always zero.
+  virtual void KeyError(const std::string& key_system,
+                        const std::string& session_id,
+                        AesDecryptor::KeyError error_code,
+                        int system_code) = 0;
+
+  virtual void KeyMessage(const std::string& key_system,
+                          const std::string& session_id,
+                          scoped_array<uint8> message,
+                          int message_length,
+                          const std::string& default_url) = 0;
+
+  virtual void KeyNeeded(const std::string& key_system,

[ddorwin, 2012/06/11 21:02:40]

The proposal uses NeedKey.

[xhwang, 2012/06/12 19:01:15]

Done.

+                         const std::string& session_id,
+                         scoped_array<uint8> init_data,
+                         int init_data_length) = 0;
+};
+
+}  // namespace media
+
+#endif  // MEDIA_CRYPTO_DECRYPTOR_CLIENT_H_