1 /* 2 * Copyright (C) 2010 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 #ifndef __DRM_ENGINE_BASE_H__ 18 #define __DRM_ENGINE_BASE_H__ 19 20 #include <drm/drm_framework_common.h> 21 #include "IDrmEngine.h" 22 23 namespace android { 24 25 /** 26 * This class is an interface for plug-in developers 27 * 28 * Responsibility of this class is control the sequence of actual plug-in. 29 * All each plug-in developer has to do is implement onXXX() type virtual interfaces. 30 */ 31 class DrmEngineBase : public IDrmEngine { 32 public: 33 DrmEngineBase(); 34 virtual ~DrmEngineBase(); 35 36 public: 37 DrmConstraints* getConstraints(int uniqueId, const String8* path, int action); 38 39 DrmMetadata* getMetadata(int uniqueId, const String8* path); 40 41 status_t initialize(int uniqueId); 42 43 status_t setOnInfoListener(int uniqueId, const IDrmEngine::OnInfoListener* infoListener); 44 45 status_t terminate(int uniqueId); 46 47 bool canHandle(int uniqueId, const String8& path); 48 49 DrmInfoStatus* processDrmInfo(int uniqueId, const DrmInfo* drmInfo); 50 51 status_t saveRights(int uniqueId, const DrmRights& drmRights, 52 const String8& rightsPath, const String8& contentPath); 53 54 DrmInfo* acquireDrmInfo(int uniqueId, const DrmInfoRequest* drmInfoRequest); 55 56 String8 getOriginalMimeType(int uniqueId, const String8& path, int fd); 57 58 int getDrmObjectType(int uniqueId, const String8& path, const String8& mimeType); 59 60 int checkRightsStatus(int uniqueId, const String8& path, int action); 61 62 status_t consumeRights(int uniqueId, DecryptHandle* decryptHandle, int action, bool reserve); 63 64 status_t setPlaybackStatus( 65 int uniqueId, DecryptHandle* decryptHandle, int playbackStatus, int64_t position); 66 67 bool validateAction( 68 int uniqueId, const String8& path, int action, const ActionDescription& description); 69 70 status_t removeRights(int uniqueId, const String8& path); 71 72 status_t removeAllRights(int uniqueId); 73 74 status_t openConvertSession(int uniqueId, int convertId); 75 76 DrmConvertedStatus* convertData(int uniqueId, int convertId, const DrmBuffer* inputData); 77 78 DrmConvertedStatus* closeConvertSession(int uniqueId, int convertId); 79 80 DrmSupportInfo* getSupportInfo(int uniqueId); 81 82 status_t openDecryptSession( 83 int uniqueId, DecryptHandle* decryptHandle, 84 int fd, off64_t offset, off64_t length, const char* mime); 85 86 status_t openDecryptSession( 87 int uniqueId, DecryptHandle* decryptHandle, 88 const char* uri, const char* mime); 89 90 status_t openDecryptSession(int uniqueId, DecryptHandle* decryptHandle, 91 const DrmBuffer& buf, const String8& mimeType); 92 93 status_t closeDecryptSession(int uniqueId, DecryptHandle* decryptHandle); 94 95 status_t initializeDecryptUnit(int uniqueId, DecryptHandle* decryptHandle, 96 int decryptUnitId, const DrmBuffer* headerInfo); 97 98 status_t decrypt(int uniqueId, DecryptHandle* decryptHandle, int decryptUnitId, 99 const DrmBuffer* encBuffer, DrmBuffer** decBuffer, DrmBuffer* IV); 100 101 status_t finalizeDecryptUnit(int uniqueId, DecryptHandle* decryptHandle, int decryptUnitId); 102 103 ssize_t pread(int uniqueId, DecryptHandle* decryptHandle, 104 void* buffer, ssize_t numBytes, off64_t offset); 105 106 protected: 107 ///////////////////////////////////////////////////// 108 // Interface for plug-in developers // 109 // each plug-in has to implement following method // 110 ///////////////////////////////////////////////////// 111 /** 112 * Get constraint information associated with input content 113 * 114 * @param[in] uniqueId Unique identifier for a session 115 * @param[in] path Path of the protected content 116 * @param[in] action Actions defined such as, 117 * Action::DEFAULT, Action::PLAY, etc 118 * @return DrmConstraints 119 * key-value pairs of constraint are embedded in it 120 * @note 121 * In case of error, return NULL 122 */ 123 virtual DrmConstraints* onGetConstraints( 124 int uniqueId, const String8* path, int action) = 0; 125 126 /** 127 * Get metadata information associated with input content 128 * 129 * @param[in] uniqueId Unique identifier for a session 130 * @param[in] path Path of the protected content 131 * @return DrmMetadata 132 * key-value pairs of metadata 133 * @note 134 * In case of error, return NULL 135 */ 136 virtual DrmMetadata* onGetMetadata(int uniqueId, const String8* path) = 0; 137 138 /** 139 * Initialize plug-in 140 * 141 * @param[in] uniqueId Unique identifier for a session 142 * @return status_t 143 * Returns DRM_NO_ERROR for success, DRM_ERROR_UNKNOWN for failure 144 */ 145 virtual status_t onInitialize(int uniqueId) = 0; 146 147 /** 148 * Register a callback to be invoked when the caller required to 149 * receive necessary information 150 * 151 * @param[in] uniqueId Unique identifier for a session. uniqueId is a random 152 * number generated in the DRM service. If the DrmManagerClient 153 * is created in native code, uniqueId will be a number ranged 154 * from 0x1000 to 0x1fff. If it comes from Java code, the uniqueId 155 * will be a number ranged from 0x00 to 0xfff. So bit 0x1000 in 156 * uniqueId could be used in DRM plugins to differentiate native 157 * OnInfoListener and Java OnInfoListener. 158 * @param[in] infoListener Listener 159 * @return status_t 160 * Returns DRM_NO_ERROR for success, DRM_ERROR_UNKNOWN for failure 161 */ 162 virtual status_t onSetOnInfoListener( 163 int uniqueId, const IDrmEngine::OnInfoListener* infoListener) = 0; 164 165 /** 166 * Terminate the plug-in 167 * and release resource bound to plug-in 168 * 169 * @param[in] uniqueId Unique identifier for a session 170 * @return status_t 171 * Returns DRM_NO_ERROR for success, DRM_ERROR_UNKNOWN for failure 172 */ 173 virtual status_t onTerminate(int uniqueId) = 0; 174 175 /** 176 * Get whether the given content can be handled by this plugin or not 177 * 178 * @param[in] uniqueId Unique identifier for a session 179 * @param[in] path Path the protected object 180 * @return bool 181 * Returns true if this plugin can handle , false in case of not able to handle 182 */ 183 virtual bool onCanHandle(int uniqueId, const String8& path) = 0; 184 185 /** 186 * Executes given drm information based on its type 187 * 188 * @param[in] uniqueId Unique identifier for a session 189 * @param[in] drmInfo Information needs to be processed 190 * @return DrmInfoStatus 191 * instance as a result of processing given input 192 */ 193 virtual DrmInfoStatus* onProcessDrmInfo(int uniqueId, const DrmInfo* drmInfo) = 0; 194 195 /** 196 * Save DRM rights to specified rights path 197 * and make association with content path 198 * 199 * @param[in] uniqueId Unique identifier for a session 200 * @param[in] drmRights DrmRights to be saved 201 * @param[in] rightsPath File path where rights to be saved 202 * @param[in] contentPath File path where content was saved 203 * @return status_t 204 * Returns DRM_NO_ERROR for success, DRM_ERROR_UNKNOWN for failure 205 */ 206 virtual status_t onSaveRights(int uniqueId, const DrmRights& drmRights, 207 const String8& rightspath, const String8& contentPath) = 0; 208 209 /** 210 * Retrieves necessary information for registration, unregistration or rights 211 * acquisition information. 212 * 213 * @param[in] uniqueId Unique identifier for a session 214 * @param[in] drmInfoRequest Request information to retrieve drmInfo 215 * @return DrmInfo 216 * instance as a result of processing given input 217 */ 218 virtual DrmInfo* onAcquireDrmInfo(int uniqueId, const DrmInfoRequest* drmInforequest) = 0; 219 220 /** 221 * Retrieves the mime type embedded inside the original content 222 * 223 * @param[in] uniqueId Unique identifier for a session 224 * @param[in] path Path of the protected content 225 * @param[in] fd descriptor of the protected content as a file source 226 * @return String8 227 * Returns mime-type of the original content, such as "video/mpeg" 228 */ 229 virtual String8 onGetOriginalMimeType(int uniqueId, const String8& path, int fd) = 0; 230 231 /** 232 * Retrieves the type of the protected object (content, rights, etc..) 233 * using specified path or mimetype. At least one parameter should be non null 234 * to retrieve DRM object type 235 * 236 * @param[in] uniqueId Unique identifier for a session 237 * @param[in] path Path of the content or null. 238 * @param[in] mimeType Mime type of the content or null. 239 * @return type of the DRM content, 240 * such as DrmObjectType::CONTENT, DrmObjectType::RIGHTS_OBJECT 241 */ 242 virtual int onGetDrmObjectType( 243 int uniqueId, const String8& path, const String8& mimeType) = 0; 244 245 /** 246 * Check whether the given content has valid rights or not 247 * 248 * @param[in] uniqueId Unique identifier for a session 249 * @param[in] path Path of the protected content 250 * @param[in] action Action to perform (Action::DEFAULT, Action::PLAY, etc) 251 * @return the status of the rights for the protected content, 252 * such as RightsStatus::RIGHTS_VALID, RightsStatus::RIGHTS_EXPIRED, etc. 253 */ 254 virtual int onCheckRightsStatus(int uniqueId, const String8& path, int action) = 0; 255 256 /** 257 * Consumes the rights for a content. 258 * If the reserve parameter is true the rights is reserved until the same 259 * application calls this api again with the reserve parameter set to false. 260 * 261 * @param[in] uniqueId Unique identifier for a session 262 * @param[in] decryptHandle Handle for the decryption session 263 * @param[in] action Action to perform. (Action::DEFAULT, Action::PLAY, etc) 264 * @param[in] reserve True if the rights should be reserved. 265 * @return status_t 266 * Returns DRM_NO_ERROR for success, DRM_ERROR_UNKNOWN for failure 267 */ 268 virtual status_t onConsumeRights(int uniqueId, DecryptHandle* decryptHandle, 269 int action, bool reserve) = 0; 270 271 /** 272 * Informs the DRM Engine about the playback actions performed on the DRM files. 273 * 274 * @param[in] uniqueId Unique identifier for a session 275 * @param[in] decryptHandle Handle for the decryption session 276 * @param[in] playbackStatus Playback action (Playback::START, Playback::STOP, Playback::PAUSE) 277 * @param[in] position Position in the file (in milliseconds) where the start occurs. 278 * Only valid together with Playback::START. 279 * @return status_t 280 * Returns DRM_NO_ERROR for success, DRM_ERROR_UNKNOWN for failure 281 */ 282 virtual status_t onSetPlaybackStatus( 283 int uniqueId, DecryptHandle* decryptHandle, int playbackStatus, int64_t position) = 0; 284 285 /** 286 * Validates whether an action on the DRM content is allowed or not. 287 * 288 * @param[in] uniqueId Unique identifier for a session 289 * @param[in] path Path of the protected content 290 * @param[in] action Action to validate (Action::PLAY, Action::TRANSFER, etc) 291 * @param[in] description Detailed description of the action 292 * @return true if the action is allowed. 293 */ 294 virtual bool onValidateAction(int uniqueId, const String8& path, 295 int action, const ActionDescription& description) = 0; 296 297 /** 298 * Removes the rights associated with the given protected content 299 * 300 * @param[in] uniqueId Unique identifier for a session 301 * @param[in] path Path of the protected content 302 * @return status_t 303 * Returns DRM_NO_ERROR for success, DRM_ERROR_UNKNOWN for failure 304 */ 305 virtual status_t onRemoveRights(int uniqueId, const String8& path) = 0; 306 307 /** 308 * Removes all the rights information of each plug-in associated with 309 * DRM framework. Will be used in master reset 310 * 311 * @param[in] uniqueId Unique identifier for a session 312 * @return status_t 313 * Returns DRM_NO_ERROR for success, DRM_ERROR_UNKNOWN for failure 314 */ 315 virtual status_t onRemoveAllRights(int uniqueId) = 0; 316 317 /** 318 * This API is for Forward Lock based DRM scheme. 319 * Each time the application tries to download a new DRM file 320 * which needs to be converted, then the application has to 321 * begin with calling this API. 322 * 323 * @param[in] uniqueId Unique identifier for a session 324 * @param[in] convertId Handle for the convert session 325 * @return status_t 326 * Returns DRM_NO_ERROR for success, DRM_ERROR_UNKNOWN for failure 327 */ 328 virtual status_t onOpenConvertSession(int uniqueId, int convertId) = 0; 329 330 /** 331 * Accepts and converts the input data which is part of DRM file. 332 * The resultant converted data and the status is returned in the DrmConvertedInfo 333 * object. This method will be called each time there are new block 334 * of data received by the application. 335 * 336 * @param[in] uniqueId Unique identifier for a session 337 * @param[in] convertId Handle for the convert session 338 * @param[in] inputData Input Data which need to be converted 339 * @return Return object contains the status of the data conversion, 340 * the output converted data and offset. In this case the 341 * application will ignore the offset information. 342 */ 343 virtual DrmConvertedStatus* onConvertData( 344 int uniqueId, int convertId, const DrmBuffer* inputData) = 0; 345 346 /** 347 * Informs the Drm Agent when there is no more data which need to be converted 348 * or when an error occurs. Upon successful conversion of the complete data, 349 * the agent will inform that where the header and body signature 350 * should be added. This signature appending is needed to integrity 351 * protect the converted file. 352 * 353 * @param[in] uniqueId Unique identifier for a session 354 * @param[in] convertId Handle for the convert session 355 * @return Return object contains the status of the data conversion, 356 * the header and body signature data. It also informs 357 * the application on which offset these signature data 358 * should be appended. 359 */ 360 virtual DrmConvertedStatus* onCloseConvertSession(int uniqueId, int convertId) = 0; 361 362 /** 363 * Returns the information about the Drm Engine capabilities which includes 364 * supported MimeTypes and file suffixes. 365 * 366 * @param[in] uniqueId Unique identifier for a session 367 * @return DrmSupportInfo 368 * instance which holds the capabilities of a plug-in 369 */ 370 virtual DrmSupportInfo* onGetSupportInfo(int uniqueId) = 0; 371 372 /** 373 * Open the decrypt session to decrypt the given protected content 374 * 375 * @param[in] uniqueId Unique identifier for a session 376 * @param[in] decryptHandle Handle for the current decryption session 377 * @param[in] fd File descriptor of the protected content to be decrypted 378 * @param[in] offset Start position of the content 379 * @param[in] length The length of the protected content 380 * @return 381 * DRM_ERROR_CANNOT_HANDLE for failure and DRM_NO_ERROR for success 382 */ 383 virtual status_t onOpenDecryptSession( 384 int uniqueId, DecryptHandle* decryptHandle, 385 int fd, off64_t offset, off64_t length) = 0; 386 387 /** 388 * Open the decrypt session to decrypt the given protected content 389 * 390 * @param[in] uniqueId Unique identifier for a session 391 * @param[in] decryptHandle Handle for the current decryption session 392 * @param[in] fd File descriptor of the protected content to be decrypted 393 * @param[in] offset Start position of the content 394 * @param[in] length The length of the protected content 395 * @param[in] mime Mime type of the protected content 396 * drm plugin may do some optimization since the mime type is known. 397 * @return 398 * DRM_ERROR_CANNOT_HANDLE for failure and DRM_NO_ERROR for success 399 */ 400 virtual status_t onOpenDecryptSession( 401 int uniqueId, DecryptHandle* decryptHandle, 402 int fd, off64_t offset, off64_t length, 403 const char* mime) { 404 405 return DRM_ERROR_CANNOT_HANDLE; 406 } 407 408 /** 409 * Open the decrypt session to decrypt the given protected content 410 * 411 * @param[in] uniqueId Unique identifier for a session 412 * @param[in] decryptHandle Handle for the current decryption session 413 * @param[in] uri Path of the protected content to be decrypted 414 * @return 415 * DRM_ERROR_CANNOT_HANDLE for failure and DRM_NO_ERROR for success 416 */ 417 virtual status_t onOpenDecryptSession( 418 int uniqueId, DecryptHandle* decryptHandle, 419 const char* uri) = 0; 420 421 /** 422 * Open the decrypt session to decrypt the given protected content 423 * 424 * @param[in] uniqueId Unique identifier for a session 425 * @param[in] decryptHandle Handle for the current decryption session 426 * @param[in] uri Path of the protected content to be decrypted 427 * @param[in] mime Mime type of the protected content. The corresponding 428 * drm plugin may do some optimization since the mime type is known. 429 * @return 430 * DRM_ERROR_CANNOT_HANDLE for failure and DRM_NO_ERROR for success 431 */ 432 virtual status_t onOpenDecryptSession( 433 int uniqueId, DecryptHandle* decryptHandle, 434 const char* uri, const char* mime) { 435 436 return DRM_ERROR_CANNOT_HANDLE; 437 } 438 439 /** 440 * Open the decrypt session to decrypt the given protected content 441 * 442 * @param[in] uniqueId Unique identifier for a session 443 * @param[in] decryptHandle Handle for the current decryption session 444 * @param[in] buf Data to initiate decrypt session 445 * @param[in] mimeType Mime type of the protected content 446 * @return 447 * DRM_ERROR_CANNOT_HANDLE for failure and DRM_NO_ERROR for success 448 */ 449 virtual status_t onOpenDecryptSession(int uniqueId, DecryptHandle* decryptHandle, 450 const DrmBuffer& buf, const String8& mimeType) { 451 return DRM_ERROR_CANNOT_HANDLE; 452 } 453 454 /** 455 * Close the decrypt session for the given handle 456 * 457 * @param[in] uniqueId Unique identifier for a session 458 * @param[in] decryptHandle Handle for the decryption session 459 * @return status_t 460 * Returns DRM_NO_ERROR for success, DRM_ERROR_UNKNOWN for failure 461 */ 462 virtual status_t onCloseDecryptSession(int uniqueId, DecryptHandle* decryptHandle) = 0; 463 464 /** 465 * Initialize decryption for the given unit of the protected content 466 * 467 * @param[in] uniqueId Unique identifier for a session 468 * @param[in] decryptId Handle for the decryption session 469 * @param[in] decryptUnitId ID Specifies decryption unit, such as track ID 470 * @param[in] headerInfo Information for initializing decryption of this decrypUnit 471 * @return status_t 472 * Returns DRM_NO_ERROR for success, DRM_ERROR_UNKNOWN for failure 473 */ 474 virtual status_t onInitializeDecryptUnit(int uniqueId, DecryptHandle* decryptHandle, 475 int decryptUnitId, const DrmBuffer* headerInfo) = 0; 476 477 /** 478 * Decrypt the protected content buffers for the given unit 479 * This method will be called any number of times, based on number of 480 * encrypted streams received from application. 481 * 482 * @param[in] uniqueId Unique identifier for a session 483 * @param[in] decryptId Handle for the decryption session 484 * @param[in] decryptUnitId ID Specifies decryption unit, such as track ID 485 * @param[in] encBuffer Encrypted data block 486 * @param[out] decBuffer Decrypted data block 487 * @param[in] IV Optional buffer 488 * @return status_t 489 * Returns the error code for this API 490 * DRM_NO_ERROR for success, and one of DRM_ERROR_UNKNOWN, DRM_ERROR_LICENSE_EXPIRED 491 * DRM_ERROR_SESSION_NOT_OPENED, DRM_ERROR_DECRYPT_UNIT_NOT_INITIALIZED, 492 * DRM_ERROR_DECRYPT for failure. 493 */ 494 virtual status_t onDecrypt(int uniqueId, DecryptHandle* decryptHandle, int decryptUnitId, 495 const DrmBuffer* encBuffer, DrmBuffer** decBuffer, DrmBuffer* IV) = 0; 496 497 /** 498 * Finalize decryption for the given unit of the protected content 499 * 500 * @param[in] uniqueId Unique identifier for a session 501 * @param[in] decryptHandle Handle for the decryption session 502 * @param[in] decryptUnitId ID Specifies decryption unit, such as track ID 503 * @return status_t 504 * Returns DRM_NO_ERROR for success, DRM_ERROR_UNKNOWN for failure 505 */ 506 virtual status_t onFinalizeDecryptUnit( 507 int uniqueId, DecryptHandle* decryptHandle, int decryptUnitId) = 0; 508 509 /** 510 * Reads the specified number of bytes from an open DRM file. 511 * 512 * @param[in] uniqueId Unique identifier for a session 513 * @param[in] decryptHandle Handle for the decryption session 514 * @param[out] buffer Reference to the buffer that should receive the read data. 515 * @param[in] numBytes Number of bytes to read. 516 * @param[in] offset Offset with which to update the file position. 517 * 518 * @return Number of bytes read. Returns -1 for Failure. 519 */ 520 virtual ssize_t onPread(int uniqueId, DecryptHandle* decryptHandle, 521 void* buffer, ssize_t numBytes, off64_t offset) = 0; 522 }; 523 524 }; 525 526 #endif /* __DRM_ENGINE_BASE_H__ */ 527 528
