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// Copyright 2014 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 CONTENT_RENDERER_MEDIA_CRYPTO_PROXY_MEDIA_KEYS_H_
#define CONTENT_RENDERER_MEDIA_CRYPTO_PROXY_MEDIA_KEYS_H_
#include <map>
#include <string>
#include "base/basictypes.h"
#include "base/containers/hash_tables.h"
#include "base/containers/scoped_ptr_hash_map.h"
#include "media/base/cdm_promise.h"
#include "media/base/media_keys.h"
class GURL;
namespace content {
class RendererCdmManager;
// A MediaKeys proxy that wraps the EME part of RendererCdmManager.
class ProxyMediaKeys : public media::MediaKeys {
public:
static scoped_ptr<ProxyMediaKeys> Create(
const std::string& key_system,
const GURL& security_origin,
RendererCdmManager* manager,
const media::SessionMessageCB& session_message_cb,
const media::SessionReadyCB& session_ready_cb,
const media::SessionClosedCB& session_closed_cb,
const media::SessionErrorCB& session_error_cb);
virtual ~ProxyMediaKeys();
// MediaKeys implementation.
virtual void CreateSession(
const std::string& init_data_type,
const uint8* init_data,
int init_data_length,
SessionType session_type,
scoped_ptr<media::NewSessionCdmPromise> promise) OVERRIDE;
virtual void LoadSession(
const std::string& web_session_id,
scoped_ptr<media::NewSessionCdmPromise> promise) OVERRIDE;
virtual void UpdateSession(
const std::string& web_session_id,
const uint8* response,
int response_length,
scoped_ptr<media::SimpleCdmPromise> promise) OVERRIDE;
virtual void ReleaseSession(
const std::string& web_session_id,
scoped_ptr<media::SimpleCdmPromise> promise) OVERRIDE;
// Callbacks.
void OnSessionCreated(uint32 session_id, const std::string& web_session_id);
void OnSessionMessage(uint32 session_id,
const std::vector<uint8>& message,
const GURL& destination_url);
void OnSessionReady(uint32 session_id);
void OnSessionClosed(uint32 session_id);
void OnSessionError(uint32 session_id,
media::MediaKeys::KeyError error_code,
uint32 system_code);
int GetCdmId() const;
private:
// The Android-specific code that handles sessions uses integer session ids
// (basically a reference id), but media::MediaKeys bases everything on
// web_session_id (a string representing the actual session id as generated
// by the CDM). SessionIdMap is used to map between the web_session_id and
// the session_id used by the Android-specific code.
typedef base::hash_map<std::string, uint32_t> SessionIdMap;
// The following types keep track of Promises. The index is the
// Android-specific session_id, so that returning results can be matched to
// the corresponding promise.
typedef base::ScopedPtrHashMap<uint32_t, media::CdmPromise> PromiseMap;
ProxyMediaKeys(RendererCdmManager* manager,
const media::SessionMessageCB& session_message_cb,
const media::SessionReadyCB& session_ready_cb,
const media::SessionClosedCB& session_closed_cb,
const media::SessionErrorCB& session_error_cb);
void InitializeCdm(const std::string& key_system,
const GURL& security_origin);
// These functions keep track of Android-specific session_ids <->
// web_session_ids mappings.
// TODO(jrummell): Remove this once the Android-specific code changes to
// support string web session ids.
uint32_t CreateSessionId();
void AssignWebSessionId(uint32_t session_id,
const std::string& web_session_id);
uint32_t LookupSessionId(const std::string& web_session_id) const;
std::string LookupWebSessionId(uint32_t session_id) const;
void DropWebSessionId(const std::string& web_session_id);
// Helper function to keep track of promises. Adding takes ownership of the
// promise, transferred back to caller on take.
void SavePromise(uint32_t session_id, scoped_ptr<media::CdmPromise> promise);
scoped_ptr<media::CdmPromise> TakePromise(uint32_t session_id);
RendererCdmManager* manager_;
int cdm_id_;
media::SessionMessageCB session_message_cb_;
media::SessionReadyCB session_ready_cb_;
media::SessionClosedCB session_closed_cb_;
media::SessionErrorCB session_error_cb_;
// Android-specific. See comment above CreateSessionId().
uint32_t next_session_id_;
SessionIdMap web_session_to_session_id_map_;
// Keep track of outstanding promises. This map owns the promise object.
PromiseMap session_id_to_promise_map_;
DISALLOW_COPY_AND_ASSIGN(ProxyMediaKeys);
};
} // namespace content
#endif // CONTENT_RENDERER_MEDIA_CRYPTO_PROXY_MEDIA_KEYS_H_
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