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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.
#include "webkit/media/crypto/proxy_decryptor.h"
#include "base/bind.h"
#include "base/callback_helpers.h"
#include "base/logging.h"
#include "media/crypto/aes_decryptor.h"
#include "webkit/media/crypto/key_systems.h"
#if defined(ENABLE_PEPPER_CDMS)
#include "third_party/WebKit/Source/Platform/chromium/public/WebString.h"
#include "third_party/WebKit/Source/WebKit/chromium/public/WebFrame.h"
#include "third_party/WebKit/Source/WebKit/chromium/public/WebMediaPlayerClient.h"
#include "webkit/media/crypto/ppapi_decryptor.h"
#include "webkit/plugins/ppapi/ppapi_plugin_instance.h"
#include "webkit/plugins/ppapi/ppapi_webplugin_impl.h"
#endif // defined(ENABLE_PEPPER_CDMS)
namespace webkit_media {
#if defined(ENABLE_PEPPER_CDMS)
// Returns the PluginInstance associated with the Helper Plugin.
// If a non-NULL pointer is returned, the caller must call closeHelperPlugin()
// when the Helper Plugin is no longer needed.
static scoped_refptr<webkit::ppapi::PluginInstance> CreateHelperPlugin(
const std::string& plugin_type,
WebKit::WebMediaPlayerClient* web_media_player_client,
WebKit::WebFrame* web_frame) {
DCHECK(web_media_player_client);
DCHECK(web_frame);
WebKit::WebPlugin* web_plugin = web_media_player_client->createHelperPlugin(
WebKit::WebString::fromUTF8(plugin_type), web_frame);
if (!web_plugin)
return NULL;
DCHECK(!web_plugin->isPlaceholder()); // Prevented by WebKit.
// Only Pepper plugins are supported, so it must be a ppapi object.
webkit::ppapi::WebPluginImpl* ppapi_plugin =
static_cast<webkit::ppapi::WebPluginImpl*>(web_plugin);
return ppapi_plugin->instance();
}
static void DestroyHelperPlugin(
WebKit::WebMediaPlayerClient* web_media_player_client) {
web_media_player_client->closeHelperPlugin();
}
#endif // defined(ENABLE_PEPPER_CDMS)
ProxyDecryptor::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)
: web_media_player_client_(web_media_player_client),
web_frame_(web_frame),
did_create_helper_plugin_(false),
key_added_cb_(key_added_cb),
key_error_cb_(key_error_cb),
key_message_cb_(key_message_cb),
need_key_cb_(need_key_cb),
weak_ptr_factory_(this) {
}
ProxyDecryptor::~ProxyDecryptor() {
// Destroy the decryptor explicitly before destroying the plugin.
{
base::AutoLock auto_lock(lock_);
decryptor_.reset();
}
#if defined(ENABLE_PEPPER_CDMS)
if (did_create_helper_plugin_)
DestroyHelperPlugin(web_media_player_client_);
#endif
web_media_player_client_ = NULL; // We should be done using it now.
}
// TODO(xhwang): Support multiple decryptor notification request (e.g. from
// video and audio decoders). The current implementation is okay for the current
// media pipeline since we initialize audio and video decoders in sequence.
// But ProxyDecryptor should not depend on media pipeline's implementation
// detail.
void ProxyDecryptor::SetDecryptorReadyCB(
const media::DecryptorReadyCB& decryptor_ready_cb) {
base::AutoLock auto_lock(lock_);
// Cancels the previous decryptor request.
if (decryptor_ready_cb.is_null()) {
if (!decryptor_ready_cb_.is_null())
base::ResetAndReturn(&decryptor_ready_cb_).Run(NULL);
return;
}
// Normal decryptor request.
DCHECK(decryptor_ready_cb_.is_null());
if (decryptor_) {
decryptor_ready_cb.Run(decryptor_.get());
return;
}
decryptor_ready_cb_ = decryptor_ready_cb;
}
bool ProxyDecryptor::GenerateKeyRequest(const std::string& key_system,
const std::string& type,
const uint8* init_data,
int init_data_length) {
// We do not support run-time switching of decryptors. GenerateKeyRequest()
// only creates a new decryptor when |decryptor_| is not initialized.
DVLOG(1) << "GenerateKeyRequest: key_system = " << key_system;
base::AutoLock auto_lock(lock_);
if (!decryptor_) {
decryptor_ = CreateDecryptor(key_system);
if (!decryptor_) {
key_error_cb_.Run(
key_system, std::string(), media::Decryptor::kClientError, 0);
return false;
}
}
if (!decryptor_->GenerateKeyRequest(key_system, type,
init_data, init_data_length)) {
decryptor_.reset();
return false;
}
if (!decryptor_ready_cb_.is_null())
base::ResetAndReturn(&decryptor_ready_cb_).Run(decryptor_.get());
return true;
}
void ProxyDecryptor::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) {
DVLOG(1) << "AddKey()";
// WebMediaPlayerImpl ensures GenerateKeyRequest() has been called.
decryptor_->AddKey(key_system, key, key_length, init_data, init_data_length,
session_id);
}
void ProxyDecryptor::CancelKeyRequest(const std::string& key_system,
const std::string& session_id) {
DVLOG(1) << "CancelKeyRequest()";
// WebMediaPlayerImpl ensures GenerateKeyRequest() has been called.
decryptor_->CancelKeyRequest(key_system, session_id);
}
#if defined(ENABLE_PEPPER_CDMS)
scoped_ptr<media::Decryptor> ProxyDecryptor::CreatePpapiDecryptor(
const std::string& key_system) {
DCHECK(web_media_player_client_);
DCHECK(web_frame_);
std::string plugin_type = GetPepperType(key_system);
DCHECK(!plugin_type.empty());
const scoped_refptr<webkit::ppapi::PluginInstance>& plugin_instance =
CreateHelperPlugin(plugin_type, web_media_player_client_, web_frame_);
did_create_helper_plugin_ = plugin_instance != NULL;
if (!did_create_helper_plugin_) {
DVLOG(1) << "ProxyDecryptor: plugin instance creation failed.";
return scoped_ptr<media::Decryptor>();
}
return scoped_ptr<media::Decryptor>(new PpapiDecryptor(
plugin_instance,
base::Bind(&ProxyDecryptor::KeyAdded, weak_ptr_factory_.GetWeakPtr()),
base::Bind(&ProxyDecryptor::KeyError, weak_ptr_factory_.GetWeakPtr()),
base::Bind(&ProxyDecryptor::KeyMessage, weak_ptr_factory_.GetWeakPtr()),
base::Bind(&ProxyDecryptor::NeedKey, weak_ptr_factory_.GetWeakPtr())));
}
#endif // defined(ENABLE_PEPPER_CDMS)
scoped_ptr<media::Decryptor> ProxyDecryptor::CreateDecryptor(
const std::string& key_system) {
if (CanUseAesDecryptor(key_system))
return scoped_ptr<media::Decryptor>(new media::AesDecryptor(
base::Bind(&ProxyDecryptor::KeyAdded, weak_ptr_factory_.GetWeakPtr()),
base::Bind(&ProxyDecryptor::KeyError, weak_ptr_factory_.GetWeakPtr()),
base::Bind(&ProxyDecryptor::KeyMessage, weak_ptr_factory_.GetWeakPtr()),
base::Bind(&ProxyDecryptor::NeedKey, weak_ptr_factory_.GetWeakPtr())));
#if defined(ENABLE_PEPPER_CDMS)
// We only support AesDecryptor and PpapiDecryptor. So if we cannot
// use the AesDecryptor, then we'll try to create a PpapiDecryptor for given
// |key_system|.
return CreatePpapiDecryptor(key_system);
#else
return scoped_ptr<media::Decryptor>();
#endif // defined(ENABLE_PEPPER_CDMS)
}
void ProxyDecryptor::KeyAdded(const std::string& key_system,
const std::string& session_id) {
key_added_cb_.Run(key_system, session_id);
}
void ProxyDecryptor::KeyError(const std::string& key_system,
const std::string& session_id,
media::Decryptor::KeyError error_code,
int system_code) {
key_error_cb_.Run(key_system, session_id, error_code, system_code);
}
void ProxyDecryptor::KeyMessage(const std::string& key_system,
const std::string& session_id,
const std::string& message,
const std::string& default_url) {
key_message_cb_.Run(key_system, session_id, message, default_url);
}
void ProxyDecryptor::NeedKey(const std::string& key_system,
const std::string& session_id,
const std::string& type,
scoped_ptr<uint8[]> init_data,
int init_data_size) {
need_key_cb_.Run(key_system, session_id, type,
init_data.Pass(), init_data_size);
}
} // namespace webkit_media
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