ppapi/proxy/ppp_content_decryptor_private_proxy.cc

   1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "ppapi/proxy/ppp_content_decryptor_private_proxy.h"
   6
   7 #include "base/platform_file.h"
   8 #include "ppapi/c/pp_bool.h"
   9 #include "ppapi/c/ppb_core.h"
  10 #include "ppapi/proxy/content_decryptor_private_serializer.h"
  11 #include "ppapi/proxy/host_dispatcher.h"
  12 #include "ppapi/proxy/plugin_globals.h"
  13 #include "ppapi/proxy/plugin_resource_tracker.h"
  14 #include "ppapi/proxy/ppapi_messages.h"
  15 #include "ppapi/proxy/ppb_buffer_proxy.h"
  16 #include "ppapi/proxy/serialized_var.h"
  17 #include "ppapi/shared_impl/scoped_pp_resource.h"
  18 #include "ppapi/shared_impl/var_tracker.h"
  19 #include "ppapi/thunk/enter.h"
  20 #include "ppapi/thunk/ppb_buffer_api.h"
  21 #include "ppapi/thunk/ppb_instance_api.h"
  22 #include "ppapi/thunk/thunk.h"
  23
  24 using ppapi::thunk::EnterResourceNoLock;
  25 using ppapi::thunk::PPB_Buffer_API;
  26 using ppapi::thunk::PPB_Instance_API;
  27
  28 namespace ppapi {
  29 namespace proxy {
  30
  31 namespace {
  32
  33 PP_Bool DescribeHostBufferResource(PP_Resource resource, uint32_t* size) {
  34   EnterResourceNoLock<PPB_Buffer_API> enter(resource, true);
  35   if (enter.failed())
  36     return PP_FALSE;
  37   return enter.object()->Describe(size);
  38 }
  39
  40 // TODO(dmichael): Refactor so this handle sharing code is in one place.
  41 PP_Bool ShareHostBufferResourceToPlugin(
  42     HostDispatcher* dispatcher,
  43     PP_Resource resource,
  44     base::SharedMemoryHandle* shared_mem_handle) {
  45   if (!dispatcher || resource == 0 || !shared_mem_handle)
  46     return PP_FALSE;
  47   EnterResourceNoLock<PPB_Buffer_API> enter(resource, true);
  48   if (enter.failed())
  49     return PP_FALSE;
  50   int handle;
  51   int32_t result = enter.object()->GetSharedMemory(&handle);
  52   if (result != PP_OK)
  53     return PP_FALSE;
  54   base::PlatformFile platform_file =
  55   #if defined(OS_WIN)
  56       reinterpret_cast<HANDLE>(static_cast<intptr_t>(handle));
  57   #elif defined(OS_POSIX)
  58       handle;
  59   #else
  60   #error Not implemented.
  61   #endif
  62
  63   *shared_mem_handle = dispatcher->ShareHandleWithRemote(platform_file, false);
  64   return PP_TRUE;
  65 }
  66
  67 // SerializedVarReceiveInput will decrement the reference count, but we want
  68 // to give the recipient a reference. This utility function takes care of that
  69 // work for the message handlers defined below.
  70 PP_Var ExtractReceivedVarAndAddRef(Dispatcher* dispatcher,
  71                                    SerializedVarReceiveInput* serialized_var) {
  72   PP_Var var = serialized_var->Get(dispatcher);
  73   PpapiGlobals::Get()->GetVarTracker()->AddRefVar(var);
  74   return var;
  75 }
  76
  77 bool InitializePppDecryptorBuffer(PP_Instance instance,
  78                                   HostDispatcher* dispatcher,
  79                                   PP_Resource resource,
  80                                   PPPDecryptor_Buffer* buffer) {
  81   if (!buffer) {
  82     NOTREACHED();
  83     return false;
  84   }
  85
  86   if (resource == 0) {
  87     buffer->resource = HostResource();
  88     buffer->handle = base::SharedMemoryHandle();
  89     buffer->size = 0;
  90     return true;
  91   }
  92
  93   HostResource host_resource;
  94   host_resource.SetHostResource(instance, resource);
  95
  96   uint32_t size = 0;
  97   if (DescribeHostBufferResource(resource, &size) == PP_FALSE)
  98     return false;
  99
 100   base::SharedMemoryHandle handle;
 101   if (ShareHostBufferResourceToPlugin(dispatcher,
 102                                       resource,
 103                                       &handle) == PP_FALSE)
 104     return false;
 105
 106   buffer->resource = host_resource;
 107   buffer->handle = handle;
 108   buffer->size = size;
 109   return true;
 110 }
 111
 112 void Initialize(PP_Instance instance,
 113                 PP_Var key_system,
 114                 PP_Bool can_challenge_platform) {
 115   HostDispatcher* dispatcher = HostDispatcher::GetForInstance(instance);
 116   if (!dispatcher) {
 117     NOTREACHED();
 118     return;
 119   }
 120
 121   dispatcher->Send(
 122       new PpapiMsg_PPPContentDecryptor_Initialize(
 123           API_ID_PPP_CONTENT_DECRYPTOR_PRIVATE,
 124           instance,
 125           SerializedVarSendInput(dispatcher, key_system),
 126           PP_ToBool(can_challenge_platform)));
 127 }
 128
 129 void GenerateKeyRequest(PP_Instance instance,
 130                         PP_Var type,
 131                         PP_Var init_data) {
 132   HostDispatcher* dispatcher = HostDispatcher::GetForInstance(instance);
 133   if (!dispatcher) {
 134     NOTREACHED();
 135     return;
 136   }
 137
 138   dispatcher->Send(
 139       new PpapiMsg_PPPContentDecryptor_GenerateKeyRequest(
 140           API_ID_PPP_CONTENT_DECRYPTOR_PRIVATE,
 141           instance,
 142           SerializedVarSendInput(dispatcher, type),
 143           SerializedVarSendInput(dispatcher, init_data)));
 144 }
 145
 146 void AddKey(PP_Instance instance,
 147             PP_Var session_id,
 148             PP_Var key,
 149             PP_Var init_data) {
 150   HostDispatcher* dispatcher = HostDispatcher::GetForInstance(instance);
 151   if (!dispatcher) {
 152     NOTREACHED();
 153     return;
 154   }
 155
 156   dispatcher->Send(
 157       new PpapiMsg_PPPContentDecryptor_AddKey(
 158           API_ID_PPP_CONTENT_DECRYPTOR_PRIVATE,
 159           instance,
 160           SerializedVarSendInput(dispatcher, session_id),
 161           SerializedVarSendInput(dispatcher, key),
 162           SerializedVarSendInput(dispatcher, init_data)));
 163 }
 164
 165 void CancelKeyRequest(PP_Instance instance, PP_Var session_id) {
 166   HostDispatcher* dispatcher = HostDispatcher::GetForInstance(instance);
 167   if (!dispatcher) {
 168     NOTREACHED();
 169     return;
 170   }
 171
 172   dispatcher->Send(
 173       new PpapiMsg_PPPContentDecryptor_CancelKeyRequest(
 174           API_ID_PPP_CONTENT_DECRYPTOR_PRIVATE,
 175           instance,
 176           SerializedVarSendInput(dispatcher, session_id)));
 177 }
 178
 179 void Decrypt(PP_Instance instance,
 180              PP_Resource encrypted_block,
 181              const PP_EncryptedBlockInfo* encrypted_block_info) {
 182   HostDispatcher* dispatcher = HostDispatcher::GetForInstance(instance);
 183   if (!dispatcher) {
 184     NOTREACHED();
 185     return;
 186   }
 187
 188   PPPDecryptor_Buffer buffer;
 189   if (!InitializePppDecryptorBuffer(instance,
 190                                     dispatcher,
 191                                     encrypted_block,
 192                                     &buffer)) {
 193     NOTREACHED();
 194     return;
 195   }
 196
 197   std::string serialized_block_info;
 198   if (!SerializeBlockInfo(*encrypted_block_info, &serialized_block_info)) {
 199     NOTREACHED();
 200     return;
 201   }
 202
 203   // PluginResourceTracker in the plugin process assumes that resources that it
 204   // tracks have been addrefed on behalf of the plugin at the renderer side. So
 205   // we explicitly do it for |encryped_block| here.
 206   PpapiGlobals::Get()->GetResourceTracker()->AddRefResource(encrypted_block);
 207
 208   dispatcher->Send(
 209       new PpapiMsg_PPPContentDecryptor_Decrypt(
 210           API_ID_PPP_CONTENT_DECRYPTOR_PRIVATE,
 211           instance,
 212           buffer,
 213           serialized_block_info));
 214 }
 215
 216 void InitializeAudioDecoder(
 217     PP_Instance instance,
 218     const PP_AudioDecoderConfig* decoder_config,
 219     PP_Resource extra_data_buffer) {
 220   HostDispatcher* dispatcher = HostDispatcher::GetForInstance(instance);
 221   if (!dispatcher) {
 222     NOTREACHED();
 223     return;
 224   }
 225
 226   std::string serialized_decoder_config;
 227   if (!SerializeBlockInfo(*decoder_config, &serialized_decoder_config)) {
 228     NOTREACHED();
 229     return;
 230   }
 231
 232   PPPDecryptor_Buffer buffer;
 233   if (!InitializePppDecryptorBuffer(instance,
 234                                     dispatcher,
 235                                     extra_data_buffer,
 236                                     &buffer)) {
 237     NOTREACHED();
 238     return;
 239   }
 240
 241   // PluginResourceTracker in the plugin process assumes that resources that it
 242   // tracks have been addrefed on behalf of the plugin at the renderer side. So
 243   // we explicitly do it for |extra_data_buffer| here.
 244   PpapiGlobals::Get()->GetResourceTracker()->AddRefResource(extra_data_buffer);
 245
 246   dispatcher->Send(
 247       new PpapiMsg_PPPContentDecryptor_InitializeAudioDecoder(
 248           API_ID_PPP_CONTENT_DECRYPTOR_PRIVATE,
 249           instance,
 250           serialized_decoder_config,
 251           buffer));
 252 }
 253
 254 void InitializeVideoDecoder(
 255     PP_Instance instance,
 256     const PP_VideoDecoderConfig* decoder_config,
 257     PP_Resource extra_data_buffer) {
 258   HostDispatcher* dispatcher = HostDispatcher::GetForInstance(instance);
 259   if (!dispatcher) {
 260     NOTREACHED();
 261     return;
 262   }
 263
 264   std::string serialized_decoder_config;
 265   if (!SerializeBlockInfo(*decoder_config, &serialized_decoder_config)) {
 266     NOTREACHED();
 267     return;
 268   }
 269
 270   PPPDecryptor_Buffer buffer;
 271   if (!InitializePppDecryptorBuffer(instance,
 272                                     dispatcher,
 273                                     extra_data_buffer,
 274                                     &buffer)) {
 275     NOTREACHED();
 276     return;
 277   }
 278
 279   // PluginResourceTracker in the plugin process assumes that resources that it
 280   // tracks have been addrefed on behalf of the plugin at the renderer side. So
 281   // we explicitly do it for |extra_data_buffer| here.
 282   PpapiGlobals::Get()->GetResourceTracker()->AddRefResource(extra_data_buffer);
 283
 284   dispatcher->Send(
 285       new PpapiMsg_PPPContentDecryptor_InitializeVideoDecoder(
 286           API_ID_PPP_CONTENT_DECRYPTOR_PRIVATE,
 287           instance,
 288           serialized_decoder_config,
 289           buffer));
 290 }
 291
 292
 293 void DeinitializeDecoder(PP_Instance instance,
 294                          PP_DecryptorStreamType decoder_type,
 295                          uint32_t request_id) {
 296   HostDispatcher* dispatcher = HostDispatcher::GetForInstance(instance);
 297   if (!dispatcher) {
 298     NOTREACHED();
 299     return;
 300   }
 301
 302   dispatcher->Send(
 303       new PpapiMsg_PPPContentDecryptor_DeinitializeDecoder(
 304           API_ID_PPP_CONTENT_DECRYPTOR_PRIVATE,
 305           instance,
 306           decoder_type,
 307           request_id));
 308 }
 309
 310 void ResetDecoder(PP_Instance instance,
 311                   PP_DecryptorStreamType decoder_type,
 312                   uint32_t request_id) {
 313   HostDispatcher* dispatcher = HostDispatcher::GetForInstance(instance);
 314   if (!dispatcher) {
 315     NOTREACHED();
 316     return;
 317   }
 318
 319   dispatcher->Send(
 320       new PpapiMsg_PPPContentDecryptor_ResetDecoder(
 321           API_ID_PPP_CONTENT_DECRYPTOR_PRIVATE,
 322           instance,
 323           decoder_type,
 324           request_id));
 325 }
 326
 327 void DecryptAndDecode(PP_Instance instance,
 328                       PP_DecryptorStreamType decoder_type,
 329                       PP_Resource encrypted_buffer,
 330                       const PP_EncryptedBlockInfo* encrypted_block_info) {
 331   HostDispatcher* dispatcher = HostDispatcher::GetForInstance(instance);
 332   if (!dispatcher) {
 333     NOTREACHED();
 334     return;
 335   }
 336
 337   PPPDecryptor_Buffer buffer;
 338   if (!InitializePppDecryptorBuffer(instance,
 339                                     dispatcher,
 340                                     encrypted_buffer,
 341                                     &buffer)) {
 342     NOTREACHED();
 343     return;
 344   }
 345
 346   std::string serialized_block_info;
 347   if (!SerializeBlockInfo(*encrypted_block_info, &serialized_block_info)) {
 348     NOTREACHED();
 349     return;
 350   }
 351
 352   // PluginResourceTracker in the plugin process assumes that resources that it
 353   // tracks have been addrefed on behalf of the plugin at the renderer side. So
 354   // we explicitly do it for |encrypted_buffer| here.
 355   PpapiGlobals::Get()->GetResourceTracker()->AddRefResource(encrypted_buffer);
 356
 357   dispatcher->Send(
 358       new PpapiMsg_PPPContentDecryptor_DecryptAndDecode(
 359           API_ID_PPP_CONTENT_DECRYPTOR_PRIVATE,
 360           instance,
 361           decoder_type,
 362           buffer,
 363           serialized_block_info));
 364 }
 365
 366 static const PPP_ContentDecryptor_Private content_decryptor_interface = {
 367   &Initialize,
 368   &GenerateKeyRequest,
 369   &AddKey,
 370   &CancelKeyRequest,
 371   &Decrypt,
 372   &InitializeAudioDecoder,
 373   &InitializeVideoDecoder,
 374   &DeinitializeDecoder,
 375   &ResetDecoder,
 376   &DecryptAndDecode
 377 };
 378
 379 }  // namespace
 380
 381 PPP_ContentDecryptor_Private_Proxy::PPP_ContentDecryptor_Private_Proxy(
 382     Dispatcher* dispatcher)
 383     : InterfaceProxy(dispatcher),
 384       ppp_decryptor_impl_(NULL) {
 385   if (dispatcher->IsPlugin()) {
 386     ppp_decryptor_impl_ = static_cast<const PPP_ContentDecryptor_Private*>(
 387         dispatcher->local_get_interface()(
 388             PPP_CONTENTDECRYPTOR_PRIVATE_INTERFACE));
 389   }
 390 }
 391
 392 PPP_ContentDecryptor_Private_Proxy::~PPP_ContentDecryptor_Private_Proxy() {
 393 }
 394
 395 // static
 396 const PPP_ContentDecryptor_Private*
 397     PPP_ContentDecryptor_Private_Proxy::GetProxyInterface() {
 398   return &content_decryptor_interface;
 399 }
 400
 401 bool PPP_ContentDecryptor_Private_Proxy::OnMessageReceived(
 402     const IPC::Message& msg) {
 403   if (!dispatcher()->IsPlugin())
 404     return false;  // These are only valid from host->plugin.
 405                    // Don't allow the plugin to send these to the host.
 406
 407   bool handled = true;
 408   IPC_BEGIN_MESSAGE_MAP(PPP_ContentDecryptor_Private_Proxy, msg)
 409     IPC_MESSAGE_HANDLER(PpapiMsg_PPPContentDecryptor_Initialize,
 410                         OnMsgInitialize)
 411     IPC_MESSAGE_HANDLER(PpapiMsg_PPPContentDecryptor_GenerateKeyRequest,
 412                         OnMsgGenerateKeyRequest)
 413     IPC_MESSAGE_HANDLER(PpapiMsg_PPPContentDecryptor_AddKey,
 414                         OnMsgAddKey)
 415     IPC_MESSAGE_HANDLER(PpapiMsg_PPPContentDecryptor_CancelKeyRequest,
 416                         OnMsgCancelKeyRequest)
 417     IPC_MESSAGE_HANDLER(PpapiMsg_PPPContentDecryptor_Decrypt,
 418                         OnMsgDecrypt)
 419     IPC_MESSAGE_HANDLER(PpapiMsg_PPPContentDecryptor_InitializeAudioDecoder,
 420                         OnMsgInitializeAudioDecoder)
 421     IPC_MESSAGE_HANDLER(PpapiMsg_PPPContentDecryptor_InitializeVideoDecoder,
 422                         OnMsgInitializeVideoDecoder)
 423     IPC_MESSAGE_HANDLER(PpapiMsg_PPPContentDecryptor_DeinitializeDecoder,
 424                         OnMsgDeinitializeDecoder)
 425     IPC_MESSAGE_HANDLER(PpapiMsg_PPPContentDecryptor_ResetDecoder,
 426                         OnMsgResetDecoder)
 427     IPC_MESSAGE_HANDLER(PpapiMsg_PPPContentDecryptor_DecryptAndDecode,
 428                         OnMsgDecryptAndDecode)
 429     IPC_MESSAGE_UNHANDLED(handled = false)
 430   IPC_END_MESSAGE_MAP()
 431   DCHECK(handled);
 432   return handled;
 433 }
 434
 435 void PPP_ContentDecryptor_Private_Proxy::OnMsgInitialize(
 436     PP_Instance instance,
 437     SerializedVarReceiveInput key_system,
 438     bool can_challenge_platform) {
 439   if (ppp_decryptor_impl_) {
 440     CallWhileUnlocked(
 441         ppp_decryptor_impl_->Initialize,
 442         instance,
 443         ExtractReceivedVarAndAddRef(dispatcher(), &key_system),
 444         PP_FromBool(can_challenge_platform));
 445   }
 446 }
 447
 448 void PPP_ContentDecryptor_Private_Proxy::OnMsgGenerateKeyRequest(
 449     PP_Instance instance,
 450     SerializedVarReceiveInput type,
 451     SerializedVarReceiveInput init_data) {
 452   if (ppp_decryptor_impl_) {
 453     CallWhileUnlocked(ppp_decryptor_impl_->GenerateKeyRequest,
 454                       instance,
 455                       ExtractReceivedVarAndAddRef(dispatcher(), &type),
 456                       ExtractReceivedVarAndAddRef(dispatcher(), &init_data));
 457   }
 458 }
 459
 460 void PPP_ContentDecryptor_Private_Proxy::OnMsgAddKey(
 461     PP_Instance instance,
 462     SerializedVarReceiveInput session_id,
 463     SerializedVarReceiveInput key,
 464     SerializedVarReceiveInput init_data) {
 465   if (ppp_decryptor_impl_) {
 466     CallWhileUnlocked(ppp_decryptor_impl_->AddKey,
 467                       instance,
 468                       ExtractReceivedVarAndAddRef(dispatcher(), &session_id),
 469                       ExtractReceivedVarAndAddRef(dispatcher(), &key),
 470                       ExtractReceivedVarAndAddRef(dispatcher(), &init_data));
 471   }
 472 }
 473
 474 void PPP_ContentDecryptor_Private_Proxy::OnMsgCancelKeyRequest(
 475     PP_Instance instance,
 476     SerializedVarReceiveInput session_id) {
 477   if (ppp_decryptor_impl_) {
 478     CallWhileUnlocked(ppp_decryptor_impl_->CancelKeyRequest,
 479                       instance,
 480                       ExtractReceivedVarAndAddRef(dispatcher(), &session_id));
 481   }
 482 }
 483
 484 void PPP_ContentDecryptor_Private_Proxy::OnMsgDecrypt(
 485     PP_Instance instance,
 486     const PPPDecryptor_Buffer& encrypted_buffer,
 487     const std::string& serialized_block_info) {
 488   ScopedPPResource plugin_resource(
 489       ScopedPPResource::PassRef(),
 490       PPB_Buffer_Proxy::AddProxyResource(encrypted_buffer.resource,
 491                                          encrypted_buffer.handle,
 492                                          encrypted_buffer.size));
 493   if (ppp_decryptor_impl_) {
 494     PP_EncryptedBlockInfo block_info;
 495     if (!DeserializeBlockInfo(serialized_block_info, &block_info))
 496       return;
 497     CallWhileUnlocked(ppp_decryptor_impl_->Decrypt,
 498                       instance,
 499                       plugin_resource.get(),
 500                       const_cast<const PP_EncryptedBlockInfo*>(&block_info));
 501   }
 502 }
 503
 504 void PPP_ContentDecryptor_Private_Proxy::OnMsgInitializeAudioDecoder(
 505     PP_Instance instance,
 506     const std::string& serialized_decoder_config,
 507     const PPPDecryptor_Buffer& extra_data_buffer) {
 508   ScopedPPResource plugin_resource;
 509   if (extra_data_buffer.size > 0) {
 510     plugin_resource = ScopedPPResource(
 511         ScopedPPResource::PassRef(),
 512         PPB_Buffer_Proxy::AddProxyResource(extra_data_buffer.resource,
 513                                            extra_data_buffer.handle,
 514                                            extra_data_buffer.size));
 515   }
 516
 517   PP_AudioDecoderConfig decoder_config;
 518   if (!DeserializeBlockInfo(serialized_decoder_config, &decoder_config))
 519       return;
 520
 521   if (ppp_decryptor_impl_) {
 522     CallWhileUnlocked(
 523         ppp_decryptor_impl_->InitializeAudioDecoder,
 524         instance,
 525         const_cast<const PP_AudioDecoderConfig*>(&decoder_config),
 526         plugin_resource.get());
 527   }
 528 }
 529
 530 void PPP_ContentDecryptor_Private_Proxy::OnMsgInitializeVideoDecoder(
 531     PP_Instance instance,
 532     const std::string& serialized_decoder_config,
 533     const PPPDecryptor_Buffer& extra_data_buffer) {
 534   ScopedPPResource plugin_resource;
 535   if (extra_data_buffer.resource.host_resource() != 0) {
 536     plugin_resource = ScopedPPResource(
 537         ScopedPPResource::PassRef(),
 538         PPB_Buffer_Proxy::AddProxyResource(extra_data_buffer.resource,
 539                                            extra_data_buffer.handle,
 540                                            extra_data_buffer.size));
 541   }
 542
 543   PP_VideoDecoderConfig decoder_config;
 544   if (!DeserializeBlockInfo(serialized_decoder_config, &decoder_config))
 545       return;
 546
 547   if (ppp_decryptor_impl_) {
 548     CallWhileUnlocked(
 549         ppp_decryptor_impl_->InitializeVideoDecoder,
 550         instance,
 551         const_cast<const PP_VideoDecoderConfig*>(&decoder_config),
 552         plugin_resource.get());
 553   }
 554 }
 555
 556 void PPP_ContentDecryptor_Private_Proxy::OnMsgDeinitializeDecoder(
 557     PP_Instance instance,
 558     PP_DecryptorStreamType decoder_type,
 559     uint32_t request_id) {
 560   if (ppp_decryptor_impl_) {
 561     CallWhileUnlocked(
 562         ppp_decryptor_impl_->DeinitializeDecoder,
 563         instance,
 564         decoder_type,
 565         request_id);
 566   }
 567 }
 568
 569 void PPP_ContentDecryptor_Private_Proxy::OnMsgResetDecoder(
 570     PP_Instance instance,
 571     PP_DecryptorStreamType decoder_type,
 572     uint32_t request_id) {
 573   if (ppp_decryptor_impl_) {
 574     CallWhileUnlocked(
 575         ppp_decryptor_impl_->ResetDecoder,
 576         instance,
 577         decoder_type,
 578         request_id);
 579   }
 580 }
 581
 582 void PPP_ContentDecryptor_Private_Proxy::OnMsgDecryptAndDecode(
 583     PP_Instance instance,
 584     PP_DecryptorStreamType decoder_type,
 585     const PPPDecryptor_Buffer& encrypted_buffer,
 586     const std::string& serialized_block_info) {
 587   ScopedPPResource plugin_resource;
 588   if (encrypted_buffer.resource.host_resource() != 0) {
 589     plugin_resource = ScopedPPResource(
 590         ScopedPPResource::PassRef(),
 591         PPB_Buffer_Proxy::AddProxyResource(encrypted_buffer.resource,
 592                                            encrypted_buffer.handle,
 593                                            encrypted_buffer.size));
 594   }
 595
 596   if (ppp_decryptor_impl_) {
 597     PP_EncryptedBlockInfo block_info;
 598     if (!DeserializeBlockInfo(serialized_block_info, &block_info))
 599       return;
 600     CallWhileUnlocked(
 601         ppp_decryptor_impl_->DecryptAndDecode,
 602         instance,
 603         decoder_type,
 604         plugin_resource.get(),
 605         const_cast<const PP_EncryptedBlockInfo*>(&block_info));
 606   }
 607 }
 608
 609 }  // namespace proxy
 610 }  // namespace ppapi