Add PPAPI decryptor implementation.

ppapi/cpp/private/content_decryptor_private.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 PPAPI_CPP_PRIVATE_CONTENT_DECRYPTOR_PRIVATE_H_
+#define PPAPI_CPP_PRIVATE_CONTENT_DECRYPTOR_PRIVATE_H_
+
+#include "ppapi/cpp/instance_handle.h"
+#include "ppapi/cpp/var.h"
+#include "ppapi/cpp/var_array_buffer.h"
+#include "ppapi/cpp/dev/buffer_dev.h"
+#include "ppapi/c/private/ppb_content_decryptor_private.h"
+#include "ppapi/c/private/ppp_content_decryptor_private.h"
+
+namespace pp {
+
+class Instance;
+
+class ContentDecryptor_Private {
+ public:
+  explicit ContentDecryptor_Private(Instance* instance);
+  virtual ~ContentDecryptor_Private();
+
+  // PPP_ContentDecryptor_Private functions exposed as virtual functions
+  // for you to override.
+  virtual bool GenerateKeyRequest(const std::string& key_system,
+                                  pp::VarArrayBuffer init_data) = 0;
+  virtual bool AddKey(const std::string& session_id,
+                      pp::VarArrayBuffer key) = 0;
+  virtual bool CancelKeyRequest(const std::string& session_id) = 0;
+  virtual bool Decrypt(pp::Buffer_Dev encrypted_block,

[xhwang, 2012/08/15 00:27:57]

Since the type is pp::Buffer_Dev, make the variable name here and in
DecryptAndDecode "encrypted_buffer"? This is also consistent with what we have
in media code. The names in Deliver* functions seem fine as we need the name to
distinguish among block, frame and samples.

[Tom Finegan, 2012/08/16 03:10:48]

Done.

+                       int32_t request_id) = 0;
+  virtual bool DecryptAndDecode(pp::Buffer_Dev encrypted_block,
+                                int32_t request_id) = 0;
+
+  // PPB_ContentDecryptor_Private methods for passing data from the decryptor
+  // to the browser.
+  void NeedKey(const std::string& key_system,
+               const std::string& session_id,
+               const std::string& init_data);
+  void KeyAdded(const std::string& key_system,
+                const std::string& session_id);
+  void KeyMessage(const std::string& key_system,
+                  const std::string& session_id,
+                  pp::Buffer_Dev message,
+                  const std::string& default_url);  // String.

[xhwang, 2012/08/15 00:27:57]

Do we need this comment "// String"?

[Tom Finegan, 2012/08/16 03:10:48]

Done.

+  void KeyError(const std::string& key_system,
+                const std::string& session_id,
+                int32_t media_error,
+                int32_t system_code);
+  void DeliverBlock(pp::Buffer_Dev decrypted_block,
+                    int32_t request_id);
+  void DeliverFrame(pp::Buffer_Dev decrypted_frame,
+                    int32_t request_id);
+  void DeliverSamples(pp::Buffer_Dev decrypted_samples,
+                      int32_t request_id);
+
+ private:
+  InstanceHandle associated_instance_;
+};
+
+}  // namespace pp
+
+#endif  // PPAPI_CPP_PRIVATE_CONTENT_DECRYPTOR_PRIVATE_H_