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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/logging.h"
#include "media/base/decoder_buffer.h"
#include "media/base/decryptor_client.h"
#include "media/crypto/aes_decryptor.h"
#include "third_party/WebKit/Source/WebKit/chromium/public/WebFrame.h"
#include "third_party/WebKit/Source/WebKit/chromium/public/platform/WebString.h"
#include "webkit/media/crypto/key_systems.h"
#include "webkit/media/crypto/ppapi_decryptor.h"
#include "webkit/plugins/ppapi/ppapi_plugin_instance.h"
#include "webkit/plugins/ppapi/ppapi_webplugin_impl.h"
// TODO(xhwang): Put this include after "ppapi_plugin_instance.h" for definition
// of "uint8_t", which WebMediaPlayer.h uses without including a header for it.
// See: https://bugs.webkit.org/show_bug.cgi?id=92031
// Fix include order here when the bug is fixed.
#include "third_party/WebKit/Source/WebKit/chromium/public/WebMediaPlayerClient.h"
namespace webkit_media {
static scoped_refptr<webkit::ppapi::PluginInstance> CreatePluginInstance(
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();
}
ProxyDecryptor::ProxyDecryptor(
media::DecryptorClient* decryptor_client,
WebKit::WebMediaPlayerClient* web_media_player_client,
WebKit::WebFrame* web_frame)
: client_(decryptor_client),
web_media_player_client_(web_media_player_client),
web_frame_(web_frame) {
}
ProxyDecryptor::~ProxyDecryptor() {
}
void ProxyDecryptor::GenerateKeyRequest(const std::string& key_system,
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.
if (!decryptor_.get()) {
base::AutoLock auto_lock(lock_);
decryptor_ = CreateDecryptor(key_system);
}
DCHECK(client_);
if (!decryptor_.get()) {
client_->KeyError(key_system, "", media::Decryptor::kUnknownError, 0);
return;
}
decryptor_->GenerateKeyRequest(key_system, init_data, init_data_length);
}
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) {
// WebMediaPlayerImpl ensures GenerateKeyRequest() has been called.
DCHECK(decryptor_.get());
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) {
// WebMediaPlayerImpl ensures GenerateKeyRequest() has been called.
DCHECK(decryptor_.get());
decryptor_->CancelKeyRequest(key_system, session_id);
}
void ProxyDecryptor::Decrypt(
const scoped_refptr<media::DecoderBuffer>& encrypted,
const DecryptCB& decrypt_cb) {
// This is safe as we do not replace/delete an existing decryptor at run-time.
media::Decryptor* decryptor = NULL;
{
base::AutoLock auto_lock(lock_);
decryptor = decryptor_.get();
}
if (!decryptor) {
DVLOG(1) << "ProxyDecryptor::Decrypt(): decryptor not initialized.";
decrypt_cb.Run(kError, NULL);
return;
}
decryptor->Decrypt(encrypted, decrypt_cb);
}
scoped_ptr<media::Decryptor> ProxyDecryptor::CreatePpapiDecryptor(
const std::string& key_system) {
DCHECK(client_);
DCHECK(web_media_player_client_);
DCHECK(web_frame_);
std::string plugin_type = GetPluginType(key_system);
DCHECK(!plugin_type.empty());
const scoped_refptr<webkit::ppapi::PluginInstance>& plugin_instance =
CreatePluginInstance(plugin_type, web_media_player_client_, web_frame_);
if (!plugin_instance) {
DVLOG(1) << "PpapiDecryptor: plugin instance creation failed.";
return scoped_ptr<media::Decryptor>();
}
return scoped_ptr<media::Decryptor>(new PpapiDecryptor(client_,
plugin_instance));
}
scoped_ptr<media::Decryptor> ProxyDecryptor::CreateDecryptor(
const std::string& key_system) {
DCHECK(client_);
if (CanUseAesDecryptor(key_system))
return scoped_ptr<media::Decryptor>(new media::AesDecryptor(client_));
// 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);
}
} // namespace webkit_media
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