media/cdm/ppapi/external_clear_key/clear_key_cdm.cc

   1 // Copyright 2013 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 "media/cdm/ppapi/external_clear_key/clear_key_cdm.h"
   6
   7 #include <algorithm>
   8 #include <cstring>
   9 #include <sstream>
  10
  11 #include "base/bind.h"
  12 #include "base/logging.h"
  13 #include "base/stl_util.h"
  14 #include "base/time/time.h"
  15 #include "base/trace_event/trace_event.h"
  16 #include "media/base/cdm_callback_promise.h"
  17 #include "media/base/cdm_key_information.h"
  18 #include "media/base/decoder_buffer.h"
  19 #include "media/base/decrypt_config.h"
  20 #include "media/base/key_systems.h"
  21 #include "media/cdm/json_web_key.h"
  22 #include "media/cdm/ppapi/cdm_file_io_test.h"
  23 #include "media/cdm/ppapi/external_clear_key/cdm_video_decoder.h"
  24 #include "url/gurl.h"
  25
  26 #if defined(CLEAR_KEY_CDM_USE_FAKE_AUDIO_DECODER)
  27 #include "base/basictypes.h"
  28 const int64 kNoTimestamp = kint64min;
  29 #endif  // CLEAR_KEY_CDM_USE_FAKE_AUDIO_DECODER
  30
  31 #if defined(CLEAR_KEY_CDM_USE_FFMPEG_DECODER)
  32 #include "base/at_exit.h"
  33 #include "base/files/file_path.h"
  34 #include "base/path_service.h"
  35 #include "media/base/media.h"
  36 #include "media/cdm/ppapi/external_clear_key/ffmpeg_cdm_audio_decoder.h"
  37 #include "media/cdm/ppapi/external_clear_key/ffmpeg_cdm_video_decoder.h"
  38
  39 // Include FFmpeg avformat.h for av_register_all().
  40 extern "C" {
  41 // Temporarily disable possible loss of data warning.
  42 MSVC_PUSH_DISABLE_WARNING(4244);
  43 #include <libavformat/avformat.h>
  44 MSVC_POP_WARNING();
  45 }  // extern "C"
  46
  47 #if !defined COMPONENT_BUILD
  48 static base::AtExitManager g_at_exit_manager;
  49 #endif
  50
  51 // Prepare media library.
  52 static bool InitializeFFmpegLibraries() {
  53   media::InitializeMediaLibrary();
  54   return true;
  55 }
  56 static bool g_ffmpeg_lib_initialized = InitializeFFmpegLibraries();
  57
  58 #endif  // CLEAR_KEY_CDM_USE_FFMPEG_DECODER
  59
  60 const char kClearKeyCdmVersion[] = "0.1.0.1";
  61 const char kExternalClearKeyKeySystem[] = "org.chromium.externalclearkey";
  62 const char kExternalClearKeyDecryptOnlyKeySystem[] =
  63     "org.chromium.externalclearkey.decryptonly";
  64 const char kExternalClearKeyFileIOTestKeySystem[] =
  65     "org.chromium.externalclearkey.fileiotest";
  66 const char kExternalClearKeyCrashKeySystem[] =
  67     "org.chromium.externalclearkey.crash";
  68
  69 // Constants for the enumalted session that can be loaded by LoadSession().
  70 // These constants need to be in sync with
  71 // chrome/test/data/media/encrypted_media_utils.js
  72 const char kLoadableSessionId[] = "LoadableSession";
  73 const uint8 kLoadableSessionKeyId[] = "0123456789012345";
  74 const uint8 kLoadableSessionKey[] =
  75     {0xeb, 0xdd, 0x62, 0xf1, 0x68, 0x14, 0xd2, 0x7b,
  76      0x68, 0xef, 0x12, 0x2a, 0xfc, 0xe4, 0xae, 0x3c};
  77
  78 const int64 kSecondsPerMinute = 60;
  79 const int64 kMsPerSecond = 1000;
  80 const int64 kInitialTimerDelayMs = 200;
  81 const int64 kMaxTimerDelayMs = 1 * kSecondsPerMinute * kMsPerSecond;
  82 // Renewal message header. For prefixed EME, if a key message starts with
  83 // |kRenewalHeader|, it's a renewal message. Otherwise, it's a key request.
  84 // FIXME(jrummell): Remove this once prefixed EME goes away.
  85 const char kRenewalHeader[] = "RENEWAL";
  86 // CDM file IO test result header.
  87 const char kFileIOTestResultHeader[] = "FILEIOTESTRESULT";
  88
  89 // Copies |input_buffer| into a media::DecoderBuffer. If the |input_buffer| is
  90 // empty, an empty (end-of-stream) media::DecoderBuffer is returned.
  91 static scoped_refptr<media::DecoderBuffer> CopyDecoderBufferFrom(
  92     const cdm::InputBuffer& input_buffer) {
  93   if (!input_buffer.data) {
  94     DCHECK(!input_buffer.data_size);
  95     return media::DecoderBuffer::CreateEOSBuffer();
  96   }
  97
  98   // TODO(xhwang): Get rid of this copy.
  99   scoped_refptr<media::DecoderBuffer> output_buffer =
 100       media::DecoderBuffer::CopyFrom(input_buffer.data, input_buffer.data_size);
 101
 102   std::vector<media::SubsampleEntry> subsamples;
 103   for (uint32_t i = 0; i < input_buffer.num_subsamples; ++i) {
 104     subsamples.push_back(
 105         media::SubsampleEntry(input_buffer.subsamples[i].clear_bytes,
 106                               input_buffer.subsamples[i].cipher_bytes));
 107   }
 108
 109   scoped_ptr<media::DecryptConfig> decrypt_config(new media::DecryptConfig(
 110       std::string(reinterpret_cast<const char*>(input_buffer.key_id),
 111                   input_buffer.key_id_size),
 112       std::string(reinterpret_cast<const char*>(input_buffer.iv),
 113                   input_buffer.iv_size),
 114       subsamples));
 115
 116   output_buffer->set_decrypt_config(decrypt_config.Pass());
 117   output_buffer->set_timestamp(
 118       base::TimeDelta::FromMicroseconds(input_buffer.timestamp));
 119
 120   return output_buffer;
 121 }
 122
 123 static std::string GetFileIOTestResultMessage(bool success) {
 124   std::string message(kFileIOTestResultHeader);
 125   message += success ? '1' : '0';
 126   return message;
 127 }
 128
 129 static cdm::Error ConvertException(media::MediaKeys::Exception exception_code) {
 130   switch (exception_code) {
 131     case media::MediaKeys::NOT_SUPPORTED_ERROR:
 132       return cdm::kNotSupportedError;
 133     case media::MediaKeys::INVALID_STATE_ERROR:
 134       return cdm::kInvalidStateError;
 135     case media::MediaKeys::INVALID_ACCESS_ERROR:
 136       return cdm::kInvalidAccessError;
 137     case media::MediaKeys::QUOTA_EXCEEDED_ERROR:
 138       return cdm::kQuotaExceededError;
 139     case media::MediaKeys::UNKNOWN_ERROR:
 140       return cdm::kUnknownError;
 141     case media::MediaKeys::CLIENT_ERROR:
 142       return cdm::kClientError;
 143     case media::MediaKeys::OUTPUT_ERROR:
 144       return cdm::kOutputError;
 145   }
 146   NOTREACHED();
 147   return cdm::kUnknownError;
 148 }
 149
 150 static media::MediaKeys::SessionType ConvertSessionType(
 151     cdm::SessionType session_type) {
 152   switch (session_type) {
 153     case cdm::kTemporary:
 154       return media::MediaKeys::TEMPORARY_SESSION;
 155     case cdm::kPersistentLicense:
 156       return media::MediaKeys::PERSISTENT_LICENSE_SESSION;
 157     case cdm::kPersistentKeyRelease:
 158       return media::MediaKeys::PERSISTENT_RELEASE_MESSAGE_SESSION;
 159   }
 160   NOTREACHED();
 161   return media::MediaKeys::TEMPORARY_SESSION;
 162 }
 163
 164 static media::EmeInitDataType ConvertInitDataType(
 165     cdm::InitDataType init_data_type) {
 166   switch (init_data_type) {
 167     case cdm::kCenc:
 168       return media::EmeInitDataType::CENC;
 169     case cdm::kKeyIds:
 170       return media::EmeInitDataType::KEYIDS;
 171     case cdm::kWebM:
 172       return media::EmeInitDataType::WEBM;
 173   }
 174   NOTREACHED();
 175   return media::EmeInitDataType::UNKNOWN;
 176 }
 177
 178 cdm::KeyStatus ConvertKeyStatus(media::CdmKeyInformation::KeyStatus status) {
 179   switch (status) {
 180     case media::CdmKeyInformation::KeyStatus::USABLE:
 181       return cdm::kUsable;
 182     case media::CdmKeyInformation::KeyStatus::INTERNAL_ERROR:
 183       return cdm::kInternalError;
 184     case media::CdmKeyInformation::KeyStatus::EXPIRED:
 185       return cdm::kExpired;
 186     case media::CdmKeyInformation::KeyStatus::OUTPUT_NOT_ALLOWED:
 187       return cdm::kOutputNotAllowed;
 188     case media::CdmKeyInformation::KeyStatus::OUTPUT_DOWNSCALED:
 189       return cdm::kOutputDownscaled;
 190     case media::CdmKeyInformation::KeyStatus::KEY_STATUS_PENDING:
 191       return cdm::kStatusPending;
 192   }
 193   NOTREACHED();
 194   return cdm::kInternalError;
 195 }
 196
 197 // Shallow copy all the key information from |keys_info| into |keys_vector|.
 198 // |keys_vector| is only valid for the lifetime of |keys_info| because it
 199 // contains pointers into the latter.
 200 void ConvertCdmKeysInfo(const std::vector<media::CdmKeyInformation*>& keys_info,
 201                         std::vector<cdm::KeyInformation>* keys_vector) {
 202   keys_vector->reserve(keys_info.size());
 203   for (const auto& key_info : keys_info) {
 204     cdm::KeyInformation key;
 205     key.key_id = vector_as_array(&key_info->key_id);
 206     key.key_id_size = key_info->key_id.size();
 207     key.status = ConvertKeyStatus(key_info->status);
 208     key.system_code = key_info->system_code;
 209     keys_vector->push_back(key);
 210   }
 211 }
 212
 213 template<typename Type>
 214 class ScopedResetter {
 215  public:
 216   explicit ScopedResetter(Type* object) : object_(object) {}
 217   ~ScopedResetter() { object_->Reset(); }
 218
 219  private:
 220   Type* const object_;
 221 };
 222
 223 void INITIALIZE_CDM_MODULE() {
 224 #if defined(CLEAR_KEY_CDM_USE_FFMPEG_DECODER)
 225   av_register_all();
 226 #endif  // CLEAR_KEY_CDM_USE_FFMPEG_DECODER
 227 }
 228
 229 void DeinitializeCdmModule() {
 230 }
 231
 232 void* CreateCdmInstance(int cdm_interface_version,
 233                         const char* key_system, uint32_t key_system_size,
 234                         GetCdmHostFunc get_cdm_host_func,
 235                         void* user_data) {
 236   DVLOG(1) << "CreateCdmInstance()";
 237
 238   std::string key_system_string(key_system, key_system_size);
 239   if (key_system_string != kExternalClearKeyKeySystem &&
 240       key_system_string != kExternalClearKeyDecryptOnlyKeySystem &&
 241       key_system_string != kExternalClearKeyFileIOTestKeySystem &&
 242       key_system_string != kExternalClearKeyCrashKeySystem) {
 243     DVLOG(1) << "Unsupported key system:" << key_system_string;
 244     return NULL;
 245   }
 246
 247   if (cdm_interface_version != media::ClearKeyCdmInterface::kVersion)
 248     return NULL;
 249
 250   media::ClearKeyCdmHost* host = static_cast<media::ClearKeyCdmHost*>(
 251       get_cdm_host_func(media::ClearKeyCdmHost::kVersion, user_data));
 252   if (!host)
 253     return NULL;
 254
 255   // TODO(jrummell): Obtain the proper origin for this instance.
 256   return new media::ClearKeyCdm(host, key_system_string, GURL::EmptyGURL());
 257 }
 258
 259 const char* GetCdmVersion() {
 260   return kClearKeyCdmVersion;
 261 }
 262
 263 namespace media {
 264
 265 ClearKeyCdm::ClearKeyCdm(ClearKeyCdmHost* host,
 266                          const std::string& key_system,
 267                          const GURL& origin)
 268     : decryptor_(
 269           origin,
 270           base::Bind(&ClearKeyCdm::OnSessionMessage, base::Unretained(this)),
 271           base::Bind(&ClearKeyCdm::OnSessionClosed, base::Unretained(this)),
 272           base::Bind(&ClearKeyCdm::OnSessionKeysChange,
 273                      base::Unretained(this))),
 274       host_(host),
 275       key_system_(key_system),
 276       has_received_keys_change_event_for_emulated_loadsession_(false),
 277       timer_delay_ms_(kInitialTimerDelayMs),
 278       renewal_timer_set_(false) {
 279 #if defined(CLEAR_KEY_CDM_USE_FAKE_AUDIO_DECODER)
 280   channel_count_ = 0;
 281   bits_per_channel_ = 0;
 282   samples_per_second_ = 0;
 283   output_timestamp_base_in_microseconds_ = kNoTimestamp;
 284   total_samples_generated_ = 0;
 285 #endif  // CLEAR_KEY_CDM_USE_FAKE_AUDIO_DECODER
 286 }
 287
 288 ClearKeyCdm::~ClearKeyCdm() {}
 289
 290 void ClearKeyCdm::Initialize(bool /* allow_distinctive_identifier */,
 291                              bool /* allow_persistent_state */) {
 292   // Implementation doesn't use distinctive identifier nor save persistent data,
 293   // so nothing to do with these values.
 294 }
 295
 296 void ClearKeyCdm::CreateSessionAndGenerateRequest(
 297     uint32 promise_id,
 298     cdm::SessionType session_type,
 299     cdm::InitDataType init_data_type,
 300     const uint8* init_data,
 301     uint32 init_data_size) {
 302   DVLOG(1) << __FUNCTION__;
 303
 304   scoped_ptr<media::NewSessionCdmPromise> promise(
 305       new media::CdmCallbackPromise<std::string>(
 306           base::Bind(&ClearKeyCdm::OnSessionCreated,
 307                      base::Unretained(this),
 308                      promise_id),
 309           base::Bind(&ClearKeyCdm::OnPromiseFailed,
 310                      base::Unretained(this),
 311                      promise_id)));
 312   decryptor_.CreateSessionAndGenerateRequest(
 313       ConvertSessionType(session_type), ConvertInitDataType(init_data_type),
 314       std::vector<uint8_t>(init_data, init_data + init_data_size),
 315       promise.Pass());
 316
 317   if (key_system_ == kExternalClearKeyFileIOTestKeySystem)
 318     StartFileIOTest();
 319 }
 320
 321 // Loads a emulated stored session. Currently only |kLoadableSessionId|
 322 // (containing a |kLoadableSessionKey| for |kLoadableSessionKeyId|) is
 323 // supported.
 324 void ClearKeyCdm::LoadSession(uint32 promise_id,
 325                               cdm::SessionType session_type,
 326                               const char* session_id,
 327                               uint32_t session_id_length) {
 328   DVLOG(1) << __FUNCTION__;
 329   DCHECK_EQ(session_type, cdm::kPersistentLicense);
 330
 331   if (std::string(kLoadableSessionId) !=
 332       std::string(session_id, session_id_length)) {
 333     host_->OnResolveNewSessionPromise(promise_id, nullptr, 0);
 334     return;
 335   }
 336
 337   // Only allowed to successfully load this session once.
 338   DCHECK(session_id_for_emulated_loadsession_.empty());
 339
 340   scoped_ptr<media::NewSessionCdmPromise> promise(
 341       new media::CdmCallbackPromise<std::string>(
 342           base::Bind(&ClearKeyCdm::OnSessionLoaded,
 343                      base::Unretained(this),
 344                      promise_id),
 345           base::Bind(&ClearKeyCdm::OnPromiseFailed,
 346                      base::Unretained(this),
 347                      promise_id)));
 348   decryptor_.CreateSessionAndGenerateRequest(
 349       MediaKeys::TEMPORARY_SESSION, EmeInitDataType::WEBM,
 350       std::vector<uint8_t>(), promise.Pass());
 351 }
 352
 353 void ClearKeyCdm::UpdateSession(uint32 promise_id,
 354                                 const char* session_id,
 355                                 uint32_t session_id_length,
 356                                 const uint8* response,
 357                                 uint32 response_size) {
 358   DVLOG(1) << __FUNCTION__;
 359   std::string web_session_str(session_id, session_id_length);
 360
 361   // If updating the loadable session, use the actual session id generated.
 362   if (web_session_str == std::string(kLoadableSessionId))
 363     web_session_str = session_id_for_emulated_loadsession_;
 364
 365   scoped_ptr<media::SimpleCdmPromise> promise(new media::CdmCallbackPromise<>(
 366       base::Bind(&ClearKeyCdm::OnPromiseResolved, base::Unretained(this),
 367                  promise_id),
 368       base::Bind(&ClearKeyCdm::OnPromiseFailed, base::Unretained(this),
 369                  promise_id)));
 370   decryptor_.UpdateSession(
 371       web_session_str, std::vector<uint8_t>(response, response + response_size),
 372       promise.Pass());
 373
 374   if (!renewal_timer_set_) {
 375     ScheduleNextRenewal();
 376     renewal_timer_set_ = true;
 377   }
 378 }
 379
 380 void ClearKeyCdm::CloseSession(uint32 promise_id,
 381                                const char* session_id,
 382                                uint32_t session_id_length) {
 383   DVLOG(1) << __FUNCTION__;
 384   std::string web_session_str(session_id, session_id_length);
 385
 386   // If closing the loadable session, use the actual session id generated.
 387   if (web_session_str == std::string(kLoadableSessionId))
 388     web_session_str = session_id_for_emulated_loadsession_;
 389
 390   scoped_ptr<media::SimpleCdmPromise> promise(new media::CdmCallbackPromise<>(
 391       base::Bind(
 392           &ClearKeyCdm::OnPromiseResolved, base::Unretained(this), promise_id),
 393       base::Bind(
 394           &ClearKeyCdm::OnPromiseFailed, base::Unretained(this), promise_id)));
 395   decryptor_.CloseSession(web_session_str, promise.Pass());
 396 }
 397
 398 void ClearKeyCdm::RemoveSession(uint32 promise_id,
 399                                 const char* session_id,
 400                                 uint32_t session_id_length) {
 401   DVLOG(1) << __FUNCTION__;
 402   std::string web_session_str(session_id, session_id_length);
 403
 404   // RemoveSession only allowed for the loadable session.
 405   if (web_session_str == std::string(kLoadableSessionId)) {
 406     web_session_str = session_id_for_emulated_loadsession_;
 407   } else {
 408     // TODO(jrummell): This should be a DCHECK once blink does the proper
 409     // checks.
 410     std::string message("Not supported for non-persistent sessions.");
 411     host_->OnRejectPromise(promise_id,
 412                            cdm::kInvalidAccessError,
 413                            0,
 414                            message.data(),
 415                            message.length());
 416     return;
 417   }
 418
 419   scoped_ptr<media::SimpleCdmPromise> promise(new media::CdmCallbackPromise<>(
 420       base::Bind(&ClearKeyCdm::OnPromiseResolved, base::Unretained(this),
 421                  promise_id),
 422       base::Bind(&ClearKeyCdm::OnPromiseFailed, base::Unretained(this),
 423                  promise_id)));
 424   decryptor_.RemoveSession(web_session_str, promise.Pass());
 425 }
 426
 427 void ClearKeyCdm::SetServerCertificate(uint32 promise_id,
 428                                        const uint8_t* server_certificate_data,
 429                                        uint32_t server_certificate_data_size) {
 430   // ClearKey doesn't use a server certificate.
 431   host_->OnResolvePromise(promise_id);
 432 }
 433
 434 void ClearKeyCdm::TimerExpired(void* context) {
 435   if (context == &session_id_for_emulated_loadsession_) {
 436     LoadLoadableSession();
 437     return;
 438   }
 439
 440   DCHECK(renewal_timer_set_);
 441   std::string renewal_message;
 442   if (!next_renewal_message_.empty() &&
 443       context == &next_renewal_message_[0]) {
 444     renewal_message = next_renewal_message_;
 445   } else {
 446     renewal_message = "ERROR: Invalid timer context found!";
 447   }
 448
 449   // This URL is only used for testing the code path for defaultURL.
 450   // There is no service at this URL, so applications should ignore it.
 451   const char url[] = "http://test.externalclearkey.chromium.org";
 452
 453   host_->OnSessionMessage(last_session_id_.data(), last_session_id_.length(),
 454                           cdm::kLicenseRenewal, renewal_message.data(),
 455                           renewal_message.length(), url, arraysize(url) - 1);
 456
 457   ScheduleNextRenewal();
 458 }
 459
 460 static void CopyDecryptResults(
 461     media::Decryptor::Status* status_copy,
 462     scoped_refptr<media::DecoderBuffer>* buffer_copy,
 463     media::Decryptor::Status status,
 464     const scoped_refptr<media::DecoderBuffer>& buffer) {
 465   *status_copy = status;
 466   *buffer_copy = buffer;
 467 }
 468
 469 cdm::Status ClearKeyCdm::Decrypt(const cdm::InputBuffer& encrypted_buffer,
 470                                  cdm::DecryptedBlock* decrypted_block) {
 471   DVLOG(1) << "Decrypt()";
 472   DCHECK(encrypted_buffer.data);
 473
 474   scoped_refptr<media::DecoderBuffer> buffer;
 475   cdm::Status status = DecryptToMediaDecoderBuffer(encrypted_buffer, &buffer);
 476
 477   if (status != cdm::kSuccess)
 478     return status;
 479
 480   DCHECK(buffer->data());
 481   decrypted_block->SetDecryptedBuffer(
 482       host_->Allocate(buffer->data_size()));
 483   memcpy(reinterpret_cast<void*>(decrypted_block->DecryptedBuffer()->Data()),
 484          buffer->data(),
 485          buffer->data_size());
 486   decrypted_block->DecryptedBuffer()->SetSize(buffer->data_size());
 487   decrypted_block->SetTimestamp(buffer->timestamp().InMicroseconds());
 488
 489   return cdm::kSuccess;
 490 }
 491
 492 cdm::Status ClearKeyCdm::InitializeAudioDecoder(
 493     const cdm::AudioDecoderConfig& audio_decoder_config) {
 494   if (key_system_ == kExternalClearKeyDecryptOnlyKeySystem)
 495     return cdm::kSessionError;
 496
 497 #if defined(CLEAR_KEY_CDM_USE_FFMPEG_DECODER)
 498   if (!audio_decoder_)
 499     audio_decoder_.reset(new media::FFmpegCdmAudioDecoder(host_));
 500
 501   if (!audio_decoder_->Initialize(audio_decoder_config))
 502     return cdm::kSessionError;
 503
 504   return cdm::kSuccess;
 505 #elif defined(CLEAR_KEY_CDM_USE_FAKE_AUDIO_DECODER)
 506   channel_count_ = audio_decoder_config.channel_count;
 507   bits_per_channel_ = audio_decoder_config.bits_per_channel;
 508   samples_per_second_ = audio_decoder_config.samples_per_second;
 509   return cdm::kSuccess;
 510 #else
 511   NOTIMPLEMENTED();
 512   return cdm::kSessionError;
 513 #endif  // CLEAR_KEY_CDM_USE_FFMPEG_DECODER
 514 }
 515
 516 cdm::Status ClearKeyCdm::InitializeVideoDecoder(
 517     const cdm::VideoDecoderConfig& video_decoder_config) {
 518   if (key_system_ == kExternalClearKeyDecryptOnlyKeySystem)
 519     return cdm::kSessionError;
 520
 521   if (video_decoder_ && video_decoder_->is_initialized()) {
 522     DCHECK(!video_decoder_->is_initialized());
 523     return cdm::kSessionError;
 524   }
 525
 526   // Any uninitialized decoder will be replaced.
 527   video_decoder_ = CreateVideoDecoder(host_, video_decoder_config);
 528   if (!video_decoder_)
 529     return cdm::kSessionError;
 530
 531   return cdm::kSuccess;
 532 }
 533
 534 void ClearKeyCdm::ResetDecoder(cdm::StreamType decoder_type) {
 535   DVLOG(1) << "ResetDecoder()";
 536 #if defined(CLEAR_KEY_CDM_USE_FFMPEG_DECODER)
 537   switch (decoder_type) {
 538     case cdm::kStreamTypeVideo:
 539       video_decoder_->Reset();
 540       break;
 541     case cdm::kStreamTypeAudio:
 542       audio_decoder_->Reset();
 543       break;
 544     default:
 545       NOTREACHED() << "ResetDecoder(): invalid cdm::StreamType";
 546   }
 547 #elif defined(CLEAR_KEY_CDM_USE_FAKE_AUDIO_DECODER)
 548   if (decoder_type == cdm::kStreamTypeAudio) {
 549     output_timestamp_base_in_microseconds_ = kNoTimestamp;
 550     total_samples_generated_ = 0;
 551   }
 552 #endif  // CLEAR_KEY_CDM_USE_FFMPEG_DECODER
 553 }
 554
 555 void ClearKeyCdm::DeinitializeDecoder(cdm::StreamType decoder_type) {
 556   DVLOG(1) << "DeinitializeDecoder()";
 557   switch (decoder_type) {
 558     case cdm::kStreamTypeVideo:
 559       video_decoder_->Deinitialize();
 560       break;
 561     case cdm::kStreamTypeAudio:
 562 #if defined(CLEAR_KEY_CDM_USE_FFMPEG_DECODER)
 563       audio_decoder_->Deinitialize();
 564 #elif defined(CLEAR_KEY_CDM_USE_FAKE_AUDIO_DECODER)
 565       output_timestamp_base_in_microseconds_ = kNoTimestamp;
 566       total_samples_generated_ = 0;
 567 #endif
 568       break;
 569     default:
 570       NOTREACHED() << "DeinitializeDecoder(): invalid cdm::StreamType";
 571   }
 572 }
 573
 574 cdm::Status ClearKeyCdm::DecryptAndDecodeFrame(
 575     const cdm::InputBuffer& encrypted_buffer,
 576     cdm::VideoFrame* decoded_frame) {
 577   DVLOG(1) << "DecryptAndDecodeFrame()";
 578   TRACE_EVENT0("media", "ClearKeyCdm::DecryptAndDecodeFrame");
 579
 580   scoped_refptr<media::DecoderBuffer> buffer;
 581   cdm::Status status = DecryptToMediaDecoderBuffer(encrypted_buffer, &buffer);
 582
 583   if (status != cdm::kSuccess)
 584     return status;
 585
 586   const uint8_t* data = NULL;
 587   int32_t size = 0;
 588   int64_t timestamp = 0;
 589   if (!buffer->end_of_stream()) {
 590     data = buffer->data();
 591     size = buffer->data_size();
 592     timestamp = encrypted_buffer.timestamp;
 593   }
 594
 595   return video_decoder_->DecodeFrame(data, size, timestamp, decoded_frame);
 596 }
 597
 598 cdm::Status ClearKeyCdm::DecryptAndDecodeSamples(
 599     const cdm::InputBuffer& encrypted_buffer,
 600     cdm::AudioFrames* audio_frames) {
 601   DVLOG(1) << "DecryptAndDecodeSamples()";
 602
 603   // Trigger a crash on purpose for testing purpose.
 604   if (key_system_ == kExternalClearKeyCrashKeySystem)
 605     CHECK(false);
 606
 607   scoped_refptr<media::DecoderBuffer> buffer;
 608   cdm::Status status = DecryptToMediaDecoderBuffer(encrypted_buffer, &buffer);
 609
 610   if (status != cdm::kSuccess)
 611     return status;
 612
 613 #if defined(CLEAR_KEY_CDM_USE_FFMPEG_DECODER)
 614   const uint8_t* data = NULL;
 615   int32_t size = 0;
 616   int64_t timestamp = 0;
 617   if (!buffer->end_of_stream()) {
 618     data = buffer->data();
 619     size = buffer->data_size();
 620     timestamp = encrypted_buffer.timestamp;
 621   }
 622
 623   return audio_decoder_->DecodeBuffer(data, size, timestamp, audio_frames);
 624 #elif defined(CLEAR_KEY_CDM_USE_FAKE_AUDIO_DECODER)
 625   int64 timestamp_in_microseconds = kNoTimestamp;
 626   if (!buffer->end_of_stream()) {
 627     timestamp_in_microseconds = buffer->GetTimestamp().InMicroseconds();
 628     DCHECK(timestamp_in_microseconds != kNoTimestamp);
 629   }
 630   return GenerateFakeAudioFrames(timestamp_in_microseconds, audio_frames);
 631 #else
 632   return cdm::kSuccess;
 633 #endif  // CLEAR_KEY_CDM_USE_FAKE_AUDIO_DECODER
 634 }
 635
 636 void ClearKeyCdm::Destroy() {
 637   DVLOG(1) << "Destroy()";
 638   delete this;
 639 }
 640
 641 void ClearKeyCdm::ScheduleNextRenewal() {
 642   // Prepare the next renewal message and set timer.
 643   std::ostringstream msg_stream;
 644   msg_stream << kRenewalHeader << " from ClearKey CDM set at time "
 645              << host_->GetCurrentWallTime() << ".";
 646   next_renewal_message_ = msg_stream.str();
 647
 648   host_->SetTimer(timer_delay_ms_, &next_renewal_message_[0]);
 649
 650   // Use a smaller timer delay at start-up to facilitate testing. Increase the
 651   // timer delay up to a limit to avoid message spam.
 652   if (timer_delay_ms_ < kMaxTimerDelayMs)
 653     timer_delay_ms_ = std::min(2 * timer_delay_ms_, kMaxTimerDelayMs);
 654 }
 655
 656 cdm::Status ClearKeyCdm::DecryptToMediaDecoderBuffer(
 657     const cdm::InputBuffer& encrypted_buffer,
 658     scoped_refptr<media::DecoderBuffer>* decrypted_buffer) {
 659   DCHECK(decrypted_buffer);
 660   scoped_refptr<media::DecoderBuffer> buffer =
 661       CopyDecoderBufferFrom(encrypted_buffer);
 662
 663   if (buffer->end_of_stream()) {
 664     *decrypted_buffer = buffer;
 665     return cdm::kSuccess;
 666   }
 667
 668   // Callback is called synchronously, so we can use variables on the stack.
 669   media::Decryptor::Status status = media::Decryptor::kError;
 670   // The AesDecryptor does not care what the stream type is. Pass kVideo
 671   // for both audio and video decryption.
 672   decryptor_.Decrypt(
 673       media::Decryptor::kVideo,
 674       buffer,
 675       base::Bind(&CopyDecryptResults, &status, decrypted_buffer));
 676
 677   if (status == media::Decryptor::kError)
 678     return cdm::kDecryptError;
 679
 680   if (status == media::Decryptor::kNoKey)
 681     return cdm::kNoKey;
 682
 683   DCHECK_EQ(status, media::Decryptor::kSuccess);
 684   return cdm::kSuccess;
 685 }
 686
 687 void ClearKeyCdm::OnPlatformChallengeResponse(
 688     const cdm::PlatformChallengeResponse& response) {
 689   NOTIMPLEMENTED();
 690 }
 691
 692 void ClearKeyCdm::OnQueryOutputProtectionStatus(
 693     cdm::QueryResult result,
 694     uint32_t link_mask,
 695     uint32_t output_protection_mask) {
 696   NOTIMPLEMENTED();
 697 };
 698
 699 void ClearKeyCdm::LoadLoadableSession() {
 700   std::string jwk_set = GenerateJWKSet(kLoadableSessionKey,
 701                                        sizeof(kLoadableSessionKey),
 702                                        kLoadableSessionKeyId,
 703                                        sizeof(kLoadableSessionKeyId) - 1);
 704   scoped_ptr<media::SimpleCdmPromise> promise(new media::CdmCallbackPromise<>(
 705       base::Bind(&ClearKeyCdm::OnLoadSessionUpdated, base::Unretained(this)),
 706       base::Bind(&ClearKeyCdm::OnPromiseFailed, base::Unretained(this),
 707                  promise_id_for_emulated_loadsession_)));
 708   decryptor_.UpdateSession(session_id_for_emulated_loadsession_,
 709                            std::vector<uint8_t>(jwk_set.begin(), jwk_set.end()),
 710                            promise.Pass());
 711 }
 712
 713 void ClearKeyCdm::OnSessionMessage(const std::string& session_id,
 714                                    MediaKeys::MessageType message_type,
 715                                    const std::vector<uint8>& message,
 716                                    const GURL& legacy_destination_url) {
 717   DVLOG(1) << "OnSessionMessage: " << message.size();
 718
 719   // Ignore the message when we are waiting to update the loadable session.
 720   if (session_id == session_id_for_emulated_loadsession_)
 721     return;
 722
 723   // OnSessionMessage() only called during CreateSession(), so no promise
 724   // involved (OnSessionCreated() called to resolve the CreateSession()
 725   // promise).
 726   host_->OnSessionMessage(session_id.data(), session_id.length(),
 727                           cdm::kLicenseRequest,
 728                           reinterpret_cast<const char*>(message.data()),
 729                           message.size(), legacy_destination_url.spec().data(),
 730                           legacy_destination_url.spec().size());
 731 }
 732
 733 void ClearKeyCdm::OnSessionKeysChange(const std::string& session_id,
 734                                       bool has_additional_usable_key,
 735                                       CdmKeysInfo keys_info) {
 736   DVLOG(1) << "OnSessionKeysChange: " << keys_info.size();
 737
 738   std::string new_session_id = session_id;
 739   if (new_session_id == session_id_for_emulated_loadsession_) {
 740     // Save |keys_info| if the loadable session is still being created. This
 741     // event will then be forwarded on in OnLoadSessionUpdated().
 742     if (promise_id_for_emulated_loadsession_ != 0) {
 743       has_received_keys_change_event_for_emulated_loadsession_ = true;
 744       keys_info_for_emulated_loadsession_.swap(keys_info);
 745       return;
 746     }
 747
 748     // Loadable session has already been created, so pass this event on,
 749     // using the session_id callers expect to see.
 750     new_session_id = std::string(kLoadableSessionId);
 751   }
 752
 753   std::vector<cdm::KeyInformation> keys_vector;
 754   ConvertCdmKeysInfo(keys_info.get(), &keys_vector);
 755   host_->OnSessionKeysChange(new_session_id.data(), new_session_id.length(),
 756                              has_additional_usable_key,
 757                              vector_as_array(&keys_vector), keys_vector.size());
 758 }
 759
 760 void ClearKeyCdm::OnSessionClosed(const std::string& session_id) {
 761   std::string new_session_id = session_id;
 762   if (new_session_id == session_id_for_emulated_loadsession_)
 763     new_session_id = std::string(kLoadableSessionId);
 764   host_->OnSessionClosed(new_session_id.data(), new_session_id.length());
 765 }
 766
 767 void ClearKeyCdm::OnSessionCreated(uint32 promise_id,
 768                                    const std::string& session_id) {
 769   // Save the latest session ID for renewal and file IO test messages.
 770   last_session_id_ = session_id;
 771
 772   host_->OnResolveNewSessionPromise(promise_id, session_id.data(),
 773                                     session_id.length());
 774 }
 775
 776 void ClearKeyCdm::OnSessionLoaded(uint32 promise_id,
 777                                   const std::string& session_id) {
 778   // Save the latest session ID for renewal and file IO test messages.
 779   last_session_id_ = session_id;
 780
 781   // |decryptor_| created some session as |session_id|, but going forward
 782   // we need to map that to |kLoadableSessionId|, as that is what callers
 783   // expect.
 784   session_id_for_emulated_loadsession_ = session_id;
 785
 786   // Delay LoadLoadableSession() to test the case where Decrypt*() calls are
 787   // made before the session is fully loaded.
 788   const int64 kDelayToLoadSessionMs = 500;
 789
 790   // Defer resolving the promise until the session is loaded.
 791   promise_id_for_emulated_loadsession_ = promise_id;
 792
 793   // Use the address of |session_id_for_emulated_loadsession_| as the timer
 794   // context so that we can call LoadLoadableSession() when the timer expires.
 795   host_->SetTimer(kDelayToLoadSessionMs, &session_id_for_emulated_loadsession_);
 796 }
 797
 798 void ClearKeyCdm::OnLoadSessionUpdated() {
 799   // This method is only called to finish loading sessions, so handle
 800   // appropriately.
 801
 802   // |promise_id_for_emulated_loadsession_| is the LoadSession() promise,
 803   // so resolve appropriately.
 804   host_->OnResolveNewSessionPromise(promise_id_for_emulated_loadsession_,
 805                                     kLoadableSessionId,
 806                                     strlen(kLoadableSessionId));
 807   promise_id_for_emulated_loadsession_ = 0;
 808
 809   // Generate the KeysChange event now that the session is "loaded" if one
 810   // was seen.
 811   // TODO(jrummell): Once the order of events is fixed in the spec, either
 812   // require the keyschange event to have happened, or remove this code.
 813   // http://crbug.com/448225
 814   if (has_received_keys_change_event_for_emulated_loadsession_) {
 815     std::vector<cdm::KeyInformation> keys_vector;
 816     CdmKeysInfo keys_info;
 817     keys_info.swap(keys_info_for_emulated_loadsession_);
 818     has_received_keys_change_event_for_emulated_loadsession_ = false;
 819     DCHECK(!keys_vector.empty());
 820     ConvertCdmKeysInfo(keys_info.get(), &keys_vector);
 821     host_->OnSessionKeysChange(
 822         kLoadableSessionId, strlen(kLoadableSessionId), !keys_vector.empty(),
 823         vector_as_array(&keys_vector), keys_vector.size());
 824   }
 825 }
 826
 827 void ClearKeyCdm::OnPromiseResolved(uint32 promise_id) {
 828   host_->OnResolvePromise(promise_id);
 829 }
 830
 831 void ClearKeyCdm::OnPromiseFailed(uint32 promise_id,
 832                                   MediaKeys::Exception exception_code,
 833                                   uint32 system_code,
 834                                   const std::string& error_message) {
 835   host_->OnRejectPromise(promise_id,
 836                          ConvertException(exception_code),
 837                          system_code,
 838                          error_message.data(),
 839                          error_message.length());
 840 }
 841
 842 #if defined(CLEAR_KEY_CDM_USE_FAKE_AUDIO_DECODER)
 843 int64 ClearKeyCdm::CurrentTimeStampInMicroseconds() const {
 844   return output_timestamp_base_in_microseconds_ +
 845          base::Time::kMicrosecondsPerSecond *
 846          total_samples_generated_  / samples_per_second_;
 847 }
 848
 849 int ClearKeyCdm::GenerateFakeAudioFramesFromDuration(
 850     int64 duration_in_microseconds,
 851     cdm::AudioFrames* audio_frames) const {
 852   int64 samples_to_generate = static_cast<double>(samples_per_second_) *
 853       duration_in_microseconds / base::Time::kMicrosecondsPerSecond + 0.5;
 854   if (samples_to_generate <= 0)
 855     return 0;
 856
 857   int64 bytes_per_sample = channel_count_ * bits_per_channel_ / 8;
 858   // |frame_size| must be a multiple of |bytes_per_sample|.
 859   int64 frame_size = bytes_per_sample * samples_to_generate;
 860
 861   int64 timestamp = CurrentTimeStampInMicroseconds();
 862
 863   const int kHeaderSize = sizeof(timestamp) + sizeof(frame_size);
 864   audio_frames->SetFrameBuffer(host_->Allocate(kHeaderSize + frame_size));
 865   uint8_t* data = audio_frames->FrameBuffer()->Data();
 866
 867   memcpy(data, &timestamp, sizeof(timestamp));
 868   data += sizeof(timestamp);
 869   memcpy(data, &frame_size, sizeof(frame_size));
 870   data += sizeof(frame_size);
 871   // You won't hear anything because we have all zeros here. But the video
 872   // should play just fine!
 873   memset(data, 0, frame_size);
 874
 875   audio_frames->FrameBuffer()->SetSize(kHeaderSize + frame_size);
 876
 877   return samples_to_generate;
 878 }
 879
 880 cdm::Status ClearKeyCdm::GenerateFakeAudioFrames(
 881     int64 timestamp_in_microseconds,
 882     cdm::AudioFrames* audio_frames) {
 883   if (timestamp_in_microseconds == kNoTimestamp)
 884     return cdm::kNeedMoreData;
 885
 886   // Return kNeedMoreData for the first frame because duration is unknown.
 887   if (output_timestamp_base_in_microseconds_ == kNoTimestamp) {
 888     output_timestamp_base_in_microseconds_ = timestamp_in_microseconds;
 889     return cdm::kNeedMoreData;
 890   }
 891
 892   int samples_generated = GenerateFakeAudioFramesFromDuration(
 893       timestamp_in_microseconds - CurrentTimeStampInMicroseconds(),
 894       audio_frames);
 895   total_samples_generated_ += samples_generated;
 896
 897   return samples_generated == 0 ? cdm::kNeedMoreData : cdm::kSuccess;
 898 }
 899 #endif  // CLEAR_KEY_CDM_USE_FAKE_AUDIO_DECODER
 900
 901 void ClearKeyCdm::StartFileIOTest() {
 902   file_io_test_runner_.reset(new FileIOTestRunner(
 903       base::Bind(&ClearKeyCdmHost::CreateFileIO, base::Unretained(host_))));
 904   file_io_test_runner_->RunAllTests(
 905       base::Bind(&ClearKeyCdm::OnFileIOTestComplete, base::Unretained(this)));
 906 }
 907
 908 void ClearKeyCdm::OnFileIOTestComplete(bool success) {
 909   DVLOG(1) << __FUNCTION__ << ": " << success;
 910   std::string message = GetFileIOTestResultMessage(success);
 911   host_->OnSessionMessage(last_session_id_.data(), last_session_id_.length(),
 912                           cdm::kLicenseRequest, message.data(),
 913                           message.length(), NULL, 0);
 914   file_io_test_runner_.reset();
 915 }
 916
 917 }  // namespace media