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// 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 WEBKIT_MEDIA_CRYPTO_PROXY_DECRYPTOR_H_
#define WEBKIT_MEDIA_CRYPTO_PROXY_DECRYPTOR_H_
#include <string>
#include "base/memory/scoped_ptr.h"
#include "base/memory/weak_ptr.h"
#include "base/synchronization/lock.h"
#include "media/base/decryptor.h"
namespace WebKit {
class WebFrame;
class WebMediaPlayerClient;
}
namespace webkit_media {
// A decryptor proxy that creates a real decryptor object on demand and
// forwards decryptor calls to it.
// TODO(xhwang): Currently we don't support run-time switching among decryptor
// objects. Fix this when needed.
class ProxyDecryptor {
public:
ProxyDecryptor(WebKit::WebMediaPlayerClient* web_media_player_client,
WebKit::WebFrame* web_frame,
const media::KeyAddedCB& key_added_cb,
const media::KeyErrorCB& key_error_cb,
const media::KeyMessageCB& key_message_cb,
const media::NeedKeyCB& need_key_cb);
virtual ~ProxyDecryptor();
// Requests the ProxyDecryptor to notify the decryptor when it's ready through
// the |decryptor_ready_cb| provided.
// If |decryptor_ready_cb| is null, the existing callback will be fired with
// NULL immediately and reset.
void SetDecryptorReadyCB(const media::DecryptorReadyCB& decryptor_ready_cb);
bool GenerateKeyRequest(const std::string& key_system,
const std::string& type,
const uint8* init_data, int init_data_length);
void AddKey(const std::string& key_system,
const uint8* key, int key_length,
const uint8* init_data, int init_data_length,
const std::string& session_id);
void CancelKeyRequest(const std::string& key_system,
const std::string& session_id);
private:
// Helper functions to create decryptors to handle the given |key_system|.
scoped_ptr<media::Decryptor> CreatePpapiDecryptor(
const std::string& key_system);
scoped_ptr<media::Decryptor> CreateDecryptor(const std::string& key_system);
// Callbacks for firing key events.
void KeyAdded(const std::string& key_system, const std::string& session_id);
void KeyError(const std::string& key_system,
const std::string& session_id,
media::Decryptor::KeyError error_code,
int system_code);
void KeyMessage(const std::string& key_system,
const std::string& session_id,
const std::string& message,
const std::string& default_url);
void NeedKey(const std::string& key_system,
const std::string& session_id,
const std::string& type,
scoped_array<uint8> init_data, int init_data_size);
// Needed to create the PpapiDecryptor.
WebKit::WebMediaPlayerClient* web_media_player_client_;
WebKit::WebFrame* web_frame_;
bool did_create_helper_plugin_;
// Callbacks for firing key events.
media::KeyAddedCB key_added_cb_;
media::KeyErrorCB key_error_cb_;
media::KeyMessageCB key_message_cb_;
media::NeedKeyCB need_key_cb_;
// Protects the |decryptor_|. Note that |decryptor_| itself should be thread
// safe as per the Decryptor interface.
base::Lock lock_;
media::DecryptorReadyCB decryptor_ready_cb_;
// The real decryptor that does decryption for the ProxyDecryptor.
// This pointer is protected by the |lock_|.
scoped_ptr<media::Decryptor> decryptor_;
base::WeakPtrFactory<ProxyDecryptor> weak_ptr_factory_;
DISALLOW_COPY_AND_ASSIGN(ProxyDecryptor);
};
} // namespace webkit_media
#endif // WEBKIT_MEDIA_CRYPTO_PROXY_DECRYPTOR_H_
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